Mechanic`s Guide HT Series Snowplows

Mechanic`s Guide HT Series Snowplows
May 1, 2010
Lit. No. 41298, Rev. 00
SNOWPLOWS
MECHANIC'S GUIDE
HT Series™ SNOWPLOWS
FEATURING THE
Insta-Act® Hydraulic System &
Isolation Module Light System
CAUTION
Read this manual before servicing the snowplow.
TABLE OF CONTENTS
PREFACE......................................................................................................... 3
SAFETY INFORMATION ................................................................................. 4
PRODUCT SPECIFICATIONS & REQUIRED TOOLS ................................... 7
ATTACHING/DETACHING SNOWPLOW FROM VEHICLE & STORAGE .... 8
VEHICLE LIGHTING CHECK.........................................................................11
HEADLAMP BEAM AIMING ..........................................................................12
HYDRAULIC HOSE ROUTING ......................................................................13
HYDRAULIC UNIT PARTS DIAGRAM ..........................................................14
SOLENOID CARTRIDGE VALVE IDENTIFICATION AND LOCATION ........15
RELIEF VALVE IDENTIFICATION AND LOCATION.....................................15
HYDRAULIC COMPONENT INSTALLATIONS .............................................16
HT Series™ CONTROLS ...............................................................................17
Hand-Held Control .................................................................................18
Joystick Control .................................................................................... 22
Master Control for the SECURITY GUARD™ System........................ 26
SYSTEM OVERVIEW – SNOWPLOW HYDRAULICS ................................. 27
3-PORT MODULE ......................................................................................... 27
Theory of Operation .............................................................................. 28
Wiring ...................................................................................................... 32
4-PORT MODULE ......................................................................................... 36
Theory of Operation .............................................................................. 36
Wiring ...................................................................................................... 37
HYDRAULIC AND ELECTRICAL SCHEMATICS..........................................41
Hydraulic Schematic ............................................................................. 41
Raise ...................................................................................................... 42
Lower ..................................................................................................... 44
Angle Right............................................................................................. 46
Angle Left ............................................................................................... 48
Hold in Raise Position – Hydraulic ...................................................... 50
Striking an Object While Plowing ........................................................ 51
Scrape Lock Function ........................................................................... 53
TROUBLESHOOTING GUIDE ...................................................................... 54
PILOT-OPERATED (POPPET STYLE) CHECK VALVE INSPECTION ....... 69
RELIEF VALVE INSPECTION AND ADJUSTMENT .................................... 70
Lit. No. 41298, Rev. 00
PREFACE
This guide has been prepared to
assist the trained mechanic in the
service of FISHER® snowplows.
It also provides safety information
and recommendations. We urge
all mechanics to read this manual
carefully before attempting to service
the FISHER snowplow equipment
covered by this guide.
Service of your FISHER snowplow
equipment is best performed by
your local Fisher Engineering outlet.
They know your snowplow best
and are interested in your complete
satisfaction.
3
May 1, 2010
SAFETY INFORMATION
Indicates a potentially
hazardous situation that, if
not avoided, could result in
death or serious personal
injury.
CAUTION
Indicates a potentially
hazardous situation that, if
not avoided, may result in
minor or moderate injury.
It may also be used to alert
against unsafe practices.
NOTE: Indicates a situation
or action that can lead to
damage to your snowplow and
vehicle or other property. Other
useful information can also be
described.
Become familiar with and inform users about the warning and instruction labels
on the back of the blade.
NOTE: If labels are missing or cannot be read, see your sales outlet.
Warning and Caution Label
Instruction Label
ATTACH
WARNING
WARNING/CAUTION AND INSTRUCTION LABELS
1. Pull Pin Release Handle to pull out
Connecting Pins.
2. Drive vehicle slowly to engage Pushplates into
Attachment Arms.
3. Attach all electrical connectors.
With ignition in "ON" position,
turn ON control and place in Lower/Float.
INSTRUCTIONS
SAFETY DEFINITIONS
4. Stand in front of blade. Fully raise Pin Release Handle to
release Connecting Pins.
5. Using the Headgear Push Bar, push Headgear toward vehicle
to allow Connecting Pins to fully engage Pushplates.
6. Push up on Jack Retract Lever. Jack will raise automatically.
Pull Jack Lock out, rotate Jack into "raised" position and
engage Jack Lock.
DO NOT EXCEED GVWR OR GAWR INCLUDING BLADE
AND BALLAST.
REMOVE BLADE ASSEMBLY BEFORE PLACING
VEHICLE ON HOIST.
Headgear Push Bar
Pin Release
Handle (raised)
SH
PU
CAUTION
Headlamp Bracket
READ OWNER'S MANUAL BEFORE OPERATING OR
SERVICING SNOWPLOW.
Jack Lock
TRANSPORT SPEED SHOULD NOT EXCEED 45 MPH.
FURTHER REDUCE SPEED UNDER ADVERSE TRAVEL
CONDITIONS.
Attachment
Arm
Pin Release
Handle (lowered)
PLOWING SPEED SHOULD NOT EXCEED 10 MPH.
Jack (raised)
ON
SEE YOUR SALES OUTLET/WEB SITE FOR SPECIFIC
VEHICLE APPLICATION RECOMMENDATIONS.
59900
OFF
Connecting Pin
Pushplate
Jack Lock
Jack Retract
Lever
Jack
(lowered)
69516
Read Owner's Manual For Complete Instructions
4. Stand in front of blade. While pushing the Headgear Push
Bar toward the vehicle with left hand, pull Pin Release
Handle to disengage Connecting Pins. Make sure
Connecting Pins are fully retracted.
5. Detach all electrical connectors.
U.S. Patents 4,999,935; 5,353,530; 5,420,480; 6,253,470; 6,944,978; 7,400,058; 7,430,821; RE35,700; CAN Patents 2,060,425; 2,356,036; and other patents pending.
DETACH
1. Place control in Lower/Float to put blade down.
2. Pull Jack Lock out, rotate Jack into "lowered"
position and engage Jack Lock.
3. Push down on Jack until it hits the ground.
Lit. No. 41298, Rev. 00
WARNING
LOWER BLADE WHEN VEHICLE IS PARKED.
May 1, 2010
4
SAFETY INFORMATION
SAFETY PRECAUTIONS
Improper installation and operation
could cause personal injury, and/
or equipment and property damage.
Read and understand labels and the
Owner's Manual before installing,
operating, or making adjustments.
WARNING
Lower blade when vehicle is
parked. Temperature changes
could change hydraulic
pressure, causing the blade to
drop unexpectedly or damaging
hydraulic components. Failure
to do this can result in serious
personal injury.
WARNING
Keep 8' clear of the blade when
it is being raised, lowered or
angled. Do not stand between
the vehicle and blade or
directly in front of the blade.
If the blade hits or drops on
you, you could be seriously
injured.
WARNING
Keep hands and feet clear of
the blade and A-frame when
attaching or detaching the
snowplow. Moving or falling
assemblies could cause
personal injury.
WARNING
Hydraulic fluid under pressure
can cause skin injection
injury. If you are injured by
hydraulic fluid, get medical
attention immediately.
WARNING
Do not exceed GVWR or GAWR
including blade and ballast.
The rating label is found on
the driver-side vehicle door
cornerpost.
WARNING
To prevent accidental
movement of the blade,
always turn the control OFF
whenever the snowplow is not
in use. The power indicator
light will turn OFF.
WARNING
Remove blade assembly before
placing vehicle on hoist.
CAUTION
Refer to the current Kit
Selection Guide for minimum
vehicle recommendations and
ballast requirements.
Lit. No. 41298, Rev. 00
HYDRAULIC SAFETY
• Always inspect hydraulic
components and hoses before
using. Replace any damaged or
worn parts immediately.
• If you suspect a hose leak, DO
NOT use your hand to locate
it. Use a piece of cardboard or
wood.
FUSES
The FISHER® electrical and hydraulic
systems contain several bladestyle automotive fuses. If a problem
should occur and fuse replacement
is necessary, the replacement
fuse must be of the same type and
amperage rating as the original.
Installing a fuse with a higher rating
can damage the system and could
start a fire. Fuse Replacement,
including fuse ratings and locations,
is located in the Maintenance section
of the Owner's Manual.
PERSONAL SAFETY
• Remove ignition key and put
the vehicle in park or in gear
to prevent others from starting
the vehicle during installation or
service.
• Wear only snug-fitting clothing
while working on your vehicle or
snowplow.
• Do not wear jewelry or a necktie,
and secure long hair.
• Wear safety goggles to protect
your eyes from battery acid,
gasoline, dirt and dust.
• Avoid touching hot surfaces such
as the engine, radiator, hoses
and exhaust pipes.
• Always have a fire extinguisher
rated BC handy, for flammable
liquids and electrical fires.
FIRE AND EXPLOSION
WARNING
Gasoline is highly flammable
and gasoline vapor is explosive.
Never smoke while working on
vehicle. Keep all open flames
away from gasoline tank and
lines. Wipe up any spilled
gasoline immediately.
Be careful when using gasoline. Do
not use gasoline to clean parts. Store
only in approved containers away
from sources of heat or flame.
May 1, 2010
5
SAFETY INFORMATION
VENTILATION
WARNING
Vehicle exhaust contains
lethal fumes. Breathing
these fumes, even in low
concentrations, can cause
death. Never operate a
vehicle in an enclosed area
without venting exhaust to the
outside.
TORQUE CHART
CAUTION
Read instructions before
assembling. Fasteners should
be finger tight until instructed
to tighten according to torque
chart. Use standard methods
and practices when attaching
snowplow including proper
personal protective safety
equipment.
Recommended Fastener Torque
Chart (ft-lb)
Size
SAE
Grade 2
SAE
Grade 5
SAE
Grade 8
1/4-20
5/16-18
3/8-16
3/8-24
7/16-14
1/2-13
9/16-12
5/8-11
3/4-10
7/8-9
1-8
6
11
19
24
30
45
66
93
150
150
220
9
18
31
46
50
75
110
150
250
378
583
13
28
46
68
75
115
165
225
370
591
893
BATTERY SAFETY
CAUTION
Batteries normally produce
explosive gases which
can cause personal injury.
Therefore, do not allow
flames, sparks or lit tobacco
to come near the battery.
When charging or working
near a battery, always cover
your face and protect your
eyes, and also provide
ventilation.
Metric Grade 8.8 (ft-lb)
Size
Torque
Size
Torque
M6
M8
M 10
7
17
35
M 12
M 14
M 16
60
95
155
6
These torque values apply to fasteners
except those noted in the instruction.
Batteries contain sulfuric acid
which burns skin, eyes and
clothing.
Disconnect the battery before
removing or replacing any
electrical components.
Lit. No. 41298, Rev. 00
May 1, 2010
SPECIFICATION
Insta-Act® Hydraulic System
CAUTION
Do not mix different kinds of
hydraulic fluid. Some fluids
are not compatible and may
cause performance problems
and product damage.
NOTE: Remove breather / fill plug
slowly to relieve any pressure in
reservoir.
Hydraulic Fluid
• FISHER® High Performance
Fluid to –25°F (–32°C) or other
fluid conforming to Military
Specification MIL H 5606A,
such as Mobil Aero HFA or Shell
AeroShell® Fluid 4.
Fluid Capacity
• Unit Reservoir = 1-1/2 Quarts
• System Total = 2-1/4 Quarts
Solenoid Valve Spool Travel =
0.07" for three- and four-way valves
(S2, S3). Travel of two-way valve (S1)
spool is not detectable with voltage
applied to coil.
Fluid Level
With the system attached to the
vehicle, activate the control. Lower the
blade to the ground and turn OFF the
control. Remove the fill plug. Fill the
reservoir to within 2-1/2" of the top of
the fill hole. Replace the fill plug.
Electrical System –
approximate values:
• Solenoid Coil Resistance =
7 Ohm at room temperature
• Solenoid Coil Amp Draw =
1.5 Amp
• Motor Relay Coil Resistance =
16–17 Ohm
• Motor Relay Amp Draw =
0.7 Amp
• Motor Amp. Draw = 100 Amp at
1650 psi ± 50 psi
• Switched Accessory Lead Draw
= 0.75 Amp
3-Port Module
Vehicle Control Harness Fuse Size
• Park/Turn – 10 Amp (Mini)
• Control – 10 Amp (Mini)
4-Port Module
(Automotive Blade-Type)
• Park/Turn – 15 Amp
• Control – 7.5 Amp
Lit. No. 41298, Rev. 00
Tools Required
to service the electrical and
hydraulic systems:
• Long Slender Needle Nose Pliers
• Flat Screwdriver
• Sockets and Combination
Wrenches: 5/16" thru 7/8",
1-1/16", 1-1/8"
• Deep Socket: 7/8"
• 10 mm Socket
• 1/4" Socket or Nut Driver
• 12V Test Light
• Torque Wrench (in-lb / ft-lb)
• Allen Wrench Set
• 600 psi Pressure Gauge w/
adapter fittings
• 3000 psi Pressure Gauge
w/adapter fittings
• Flashlight
• Pick Set
•
•
•
•
Hammer
Digital Volt/Ohm Meter
Pencil Magnet
Adjustable Pin Spanner Wrench
(capacity range 2-1/2", 1/4" pin
diameter)
Available from your FISHER® outlet:
• Isolation Module Tester
(PN 26470-2)
• Removable Spring Tool
(for replacing trip springs;
PN 20043-1)
• Hydraulic Pressure Test Kit
(PN 56686)
• Multiplexed Hyd. Diagnostic
Harness (PN 29290-1)
• Motor Bearing Sleeve Repair Kit
(PN 64589)
• Pump Shaft Seal Repair Kit
(PN 28856)
Fastener Torque
Pump Cap Screws
Motor Terminals (+ and –)
Motor to Manifold Cap Screws
Reservoir Screws
Solenoid Valves
Coil Nuts
SAE O-Ring Plugs
Hydraulic Unit Mount Bolts
Check Valves
Motor Relay Small Terminals
Motor Relay Large Terminals
Motor Relay Mount Screws
Plow Module Mount Screws
Angle Ram Gland Nuts
5/16-18 x 2
M6 Nut
M5
#10-24 x 5/16
7/8 Hex Head
3/4 Hex-Head Jam Nut
1/8 or 5/32 Internal Hex
3/8-16 x 1
7/8 Hex Head
10-32 Nut
5/16-24 Nut
1/4-20 x 1/4
1/4-20 x 5/8
150-160 in-lb
25-35 in-lb
30-40 in-lb
30-35 in-lb
19-21 ft-lb
40-60 in-lb
55-65 in-lb
25-33 ft-lb
19-21 ft-lb
15 in-lb max
35 in-lb max
60-70 in-lb
60-70 in-lb
150-180 ft-lb
May 1, 2010
7
ATTACHING / DETACHING SNOWPLOW FROM VEHICLE & STORAGE
HT Series™ Attach / Detach Diagram
NOTE: After each use of the
snowplow, reapply dielectric
grease to the electrical plugs to
maintain the protective coating on
the terminals.
Headgear Push Bar
Pin Release
Handle (raised)
SH
PU
NOTE: Multiplexed 2-plug systems
are equipped with plug covers.
Headlamp Bracket
Jack Lock
Attachment
Arm
Pin Release
Handle (lowered)
8
Jack (raised)
ON
OFF
Jack Retract
Lever
Lit. No. 41298, Rev. 00
Pushplate
Connecting Pin
Jack Lock
Jack
(lowered)
May 1, 2010
OPERATIONAL TEST AND FINAL ADJUSTMENTS
FILLING HYDRAULIC UNIT
WARNING
Keep 8' clear of the blade
drop zone when it is being
raised, lowered or angled. Do
not stand between the vehicle
and blade or directly in front
of blade. If the blade hits you
or drops on you, you could be
seriously injured.
1.
Attach the snowplow to the vehicle
according to the instructions on
the back of the blade.
2. Remove factory installed pipe
plug. Reservoir fluid level should
be within 2-1/2" from the top of
the fill hole. If additional fluid is
needed, fill the reservoir with
FISHER® EZ Flow Hydraulic
Fluid to –40°F (–40°C), or other
fluid conforming to Military
Specification MIL-H-5606A,
such as Mobil Aero HFA or Shell
AeroShell® Fluid 4.
Breather/Fill Plug
3. Replace with breather/fill plug
(included in parts box).
Drain
Plug
WARNING
To prevent accidental
movement of the blade,
always turn the control OFF
whenever the snowplow is not
in use. The power indicator
light will turn OFF.
9
FLUID CAPACITY
• Insta-Act Unit Reservoir
• Insta-Act System Total
®
1-3/4 quarts
2-3/8 to 2-3/4 quarts
CAUTION
Do not mix different types of
hydraulic fluid. Some fluids
are not compatible and may
cause performance problems
and product damage.
The HT Series™ snowplow
hydraulic system comes
pre-assembled, filled and fully
tested from the factory.
Lit. No. 41298, Rev. 00
May 1, 2010
OPERATIONAL TEST AND FINAL ADJUSTMENTS
BLADE DROP SPEED
ADJUSTMENT
WARNING
Keep 8' clear of the blade
drop zone when it is being
raised, lowered or angled. Do
not stand between the vehicle
and blade or directly in front
of blade. If the blade hits you
or drops on you, you could be
seriously injured.
2. Turn the quill IN (clockwise) to
decrease drop speed. Turn the
quill OUT (counterclockwise) to
increase drop speed.
Quill
1.
With the snowplow attached to
the properly ballasted vehicle
and the blade lowered to the
ground, the A-frame should be
parallel with the ground.
2. Fully angle the blade in raised
and lowered positions. Adjust
hose fittings and wraps so hoses
do not contact vehicle bumper,
have no sharp bends and are
wrapped at contact points with
headgear and blade.
The quill in the valve manifold
adjusts the blade drop speed.
1.
FINAL ADJUSTMENTS
10
Lower the blade to the ground
before making adjustment.
3. Stand 8' clear of the blade drop
zone when checking adjustment.
Lit. No. 41298, Rev. 00
May 1, 2010
SYSTEM OVERVIEW
VEHICLE LIGHTING CHECK
Headlamps
1.
Move vehicle headlamp switch
to the ON position. Connecting
and disconnecting the headlamp
harness plug should switch
between vehicle and snowplow
headlamps as follows:
Check the operation of vehicle
lights and then snowplow
lights with snowplow attached
to vehicle and all harnesses
connected.
Turn signals and parking lamps
Move vehicle headlamp switch to
the parking lamp "ON" position.
Parking lamps ON:
• Both vehicle and snowplow
parking lamps should be ON at
the same time.
Driver-side turn signal ON:
• Both vehicle and snowplow
driver-side turn signal lamps
should flash at the same time.
Passenger-side turn signal ON:
• Both vehicle and snowplow
passenger-side turn signal
lamps should flash at the same
time.
Headlamp harness plug
DISCONNECTED:
• Vehicle headlamps/parking
lamps should be ON.
• Snowplow headlamps/parking
lamps should be OFF.
Headlamp harness plug
CONNECTED:
• Snowplow headlamps/parking
lamps should be ON.
• Vehicle headlamps should be
OFF.
Dimmer switch should dim
whichever headlamps are
operating. The high beam
indicator on the dash should light
when either set of headlamps is
on high beam.
Daytime Running Lamps (DRLs)
For PN 29070-1:
Joystick Control or Fish-Stik®
Hand-Held Control
With the dedicated DRLs on the
truck turned ON, the snowplow
turn signals will turn ON.
The control indicator light should
light whenever the control
ON/OFF switch and the ignition
(key) switches are both in the
ON position. The snowplow
plugs do need to be connected to
the vehicle harness connectors.
If DRLs are in high or low beam
filament when the snowplow
is attached, the corresponding
snowplow lamps will turn ON.
2. Check aim of vehicle headlamps
with snowplow removed.
3. Connect all snowplow and
vehicle harnesses. Raise the
snowplow and aim snowplow
headlamps according to the
Snowplow Headlamp Beam
Aiming instructions included with
the headlamps and any state or
local regulations.
CAUTION
On 2-plug electrical systems,
plug covers shall be used
whenever snowplow is
disconnected. Cable is 12-volt
unfused source.
4. When the snowplow is removed
from the vehicle, install plug
covers on the vehicle battery
cable and lighting harness. Insert
the snowplow battery cable and
lighting harness into the cable
boot on the snowplow.
Lit. No. 41298, Rev. 00
May 1, 2010
11
SYSTEM OVERVIEW
HEADLAMP BEAM AIMING
Torque headlamp fasteners to
45 ft-lb once correct visual aim is
achieved.
1.
Place vehicle on a level surface
25 feet in front of a matte-white
screen, such as a garage
door. The screen should be
perpendicular both to the ground
and to the vehicle centerline.
2. The vehicle should be equipped
for normal operation. The
snowplow blade should be in
place and in raised position. Below
are steps listed by the Society
of Automotive Engineers (SAE)
pertinent to headlamp aiming in
specification #SAE J599d.
3. Prepare vehicle for headlamp
aim or inspection. Before
checking beam aim, the
inspector will:
a. Remove ice or mud from
under fenders.
b. Set tire inflation pressures
to the values specified on
vehicle information label.
c.
Check springs for sag or
broken leaves.
Lit. No. 41298, Rev. 00
d. See that there is no load in
the vehicle other than the
driver and ballast as specified
in the Kit Selection Guide.
e. Check functioning of any
automatic vehicle leveling
systems and specific
manufacturer's instructions
pertaining to vehicle
preparation for headlamp
aiming.
f.
Vertical
Centerline
ahead of DS
Snowplow
Headlamp
Align with
vehicle
centerline
Vertical
Centerline
ahead of PS
Snowplow
Headlamp
Horizontal
Centerline
of Snowplow
Headlamps
Clean lenses.
g. Check for bulb burnout and
proper beam switching.
h. Stabilize suspension by
rocking vehicle sideways.
4. Mark (or tape) the vertical
centerline of the snowplow
headlamps and the vertical
centerline of the vehicle on the
screen. Mark the horizontal
centerline of the snowplow
headlamps on the screen
(distance from ground to
snowplow headlamp centers).
Screen
Located
25 feet from
Snowplow
Headlamps
12
High Intensity Zones
of Snowplow Headlamps
on Low Beam
5. Align the top edge of the high
intensity zone of the snowplow
lower beam below the horizontal
centerline and the left edge
of the high intensity zone on
the vertical centerline for each
snowplow headlamp. (Refer to
diagram.)
May 1, 2010
SYSTEM OVERVIEW – HYDRAULIC HOSE ROUTING
HOSE ROUTING FOR HT Series™ BLADES
To Lift
Ram Base To PS
To Lift
Angle Ram
Ram Rod
To Lift Ram
Rod
To DS
Angle Ram
To PS Ram
To Lift Ram Base
To DS Ram
13
DS Ram
Lit. No. 41298, Rev. 00
PS Ram
May 1, 2010
SYSTEM OVERVIEW – HYDRAULIC UNIT
Insta-Act® HYDRAULIC UNIT
The HT Series™ hydraulic unit has
blade scrape lock circuitry built in.
This feature is activated when the
blade is in FLOAT. The HT Series
blade is raised in approximately
4 seconds and angled side to side in
approximately 3 seconds.
Breather
Reservoir
Magnet
O-Ring
Plate Baffle
Retainer Clip
Breather/
Fill Plug
Poppet Check Valve Kit
Inlet Fitting
Drain Plug
Pump
Quill
Quill
Valve Manifold
Pump Pressure
Crossover Relief Valve
Check Valve
Motor
Reservoir
Suction Filter
Pump Shaft Seal
Bypass Check Valve
PS Crossover Relief Valve
Valve Manifold Block
Sleeve Bearing
Drain Plug
Scrape Lock
Solenoid Cartridge Valve
Motor
Solenoid Coil
Coil Nut
Lit. No. 41298, Rev. 00
May 1, 2010
14
SYSTEM OVERVIEW – HYDRAULIC UNIT
SOLENOID CARTRIDGE VALVE IDENTIFICATION
& LOCATION
RELIEF VALVE IDENTIFICATION & LOCATION
Pump Relief
Valve
15
PS Plowing
Relief Valve
DS Plowing
Relief
Valve
Relief Valve
Scrape Lock
S3
S2
S1
Solenoid Cartridge Valves
Lit. No. 41298, Rev. 00
May 1, 2010
SYSTEM OVERVIEW – HYDRAULIC
HYDRAULIC COMPONENT INSTALLATION
Ram Seal Installation
1.
Cartridge & Check Valve Removal
Lubricate O-rings before assembly.
2. Assemble gland components as
shown, then lubricate.
3. Remove piston from rod and
assemble piston components as
shown.
Nut
Groove in Rod
Rod
4. Assemble gland to threaded end
of rod. Do not slide gland over
cross hole in rod.
5. Reassemble piston to rod and
tighten nut to 100–120 ft-lb.
6. Assemble O-ring into groove on
rod. Use tape or other protection
on threads.
7.
Piston
Gland
Apply bead of medium-strength
threadlocker all around threads
of gland.
8. Lubricate piston seals and inside
of cylinder.
Cylinder
9. Press rod assembly into cylinder
and tighten gland to 30–40 ft-lb.
Seal O-Ring Back-Up Ring
Wear Ring
Wiper
Gland
Wear
Ring
It is possible to remove cartridges
and check valves from a hydraulic
unit without draining the hydraulic
fluid from the reservoir.
1.
Install the Diagnostic Harness
(PN 29290-1) following the
instructions included with the kit.
2. Cycle through the control
functions twice to remove the
pressure in the hydraulic unit.
3. Slowly remove the breather from
the top of the hydraulic unit.
4. Either (a) completely drain
reservoir and skip to Step 9 or
(b) proceed with instructions on
removing hydraulic components
without completely draining
reservoir.
Outer
Seal
5. Install a 3/8" barb fitting into the
top of the reservoir tank.
6. Attach a hand-operated vacuum
pump to the barb fitting.
7.
Using the vacuum pump, pull a
vacuum of approximately
5"–10" Hg.
8. You should now be able to
remove cartridges and check
valves from the hydraulic unit
with minimal fluid loss. Maintain
the vacuum until the replacement
cartridge/check valve has been
installed. Once the replacement
part has been installed, release
the vacuum and remove the
3/8" barb fitting.
9. Reinstall the breather and
remove the 29290-1 Diagnostic
Harness according to the
instructions included with the kit.
Inner
Backing
Ring
Seal Position
Lit. No. 41298, Rev. 00
May 1, 2010
16
SYSTEM OVERVIEW – HT Series™ CONTROLS
1
Power Indicator
Light (red)
3
2
4
ON/OFF Switch
(Emergency Stop
on side of control)
17
ON/OFF Button
(Emergency Stop)
Hand-Held Control
Lit. No. 41298, Rev. 00
Joystick Control
May 1, 2010
HAND-HELD CONTROL with SECURITY GUARD™ Snowplow Anti-Theft System
WARNING
To prevent accidental
movement of the blade,
always push the ON/OFF
button to switch the control
OFF whenever the snowplow
is not in use. The power
indicator light will turn OFF.
CONTROL OVERVIEW
The SECURITY GUARD feature was
developed as an electrical anti-theft
system for the half-ton snowplows.
The system provides a deterrent from
theft and/or non-permitted use by
allowing you to electronically lock the
snowplow's hydraulic functions.
All half-ton snowplow controls
come equipped with the
SECURITY GUARD system. To use
this function, you must complete the
"Activation" process.
Each control is equipped with an
ON/OFF switch and an indicator
light to show when the control is
powered ON or OFF. The controls
are powered by the vehicle's battery,
so your vehicle ignition (key) switch
must be ON to use the controls.
Lit. No. 41298, Rev. 00
Float Light Power Indicator
(green)
Light (red)
ON/OFF
FLOAT
RAISE
1
2
3
4
L
LOWER
ON/OFF
Button
(Emergency
R
Stop)
Before Activating the
SECURITY GUARD System:
Install the control as stated in the
Hand-Held Control Kit Installation
Instructions, and check all snowplow
functions as described below.
OPERATING THE HANDHELD CONTROL
1.
Turn the vehicle ignition switch
to the "ON" or "ACCESSORY"
position.
NOTE: If control function
times out before desired blade
movement is complete, release
button and press again.
Automatic Shutdown
The control will automatically turn
OFF after being idle for 20 minutes.
To reactivate the control after a
shutdown, press the ON/OFF button.
2. Press the ON/OFF button on the
control. The power indicator light
glows red, indicating the control
is ON. The power indicator light
glows red whenever the control
and the vehicle ignition switch
are both ON and the electrical
connections to the snowplow are
completed.
18
The ON/OFF button operates as
an emergency stop if required.
Function Time-Outs
All control functions, except LOWER/
FLOAT, time out (stop) automatically
after a period of time. This is to
limit the amount of electrical energy
required from the vehicle.
May 1, 2010
HAND-HELD CONTROL with SECURITY GUARD™ Snowplow Anti-Theft System
Smooth Stop
The control automatically allows
the blade to coast to a stop when
the button is released. This results
in smoother operation, reduces the
shock to the hydraulic system and
increases hose and valve life.
Float Light
(green)
Function Description of Operation
RAISE
ON/OFF
FLOAT
LOWER
RAISE
Control Functions
1
2
Raise, Lower, Float, Angle
The four diamond-shaped buttons
in the center of the control face,
when pressed, will result in the blade
movements described in the table.
FLOAT
L
R
3
4
LOWER
L
(Angle
Left)
R
(Angle
Right)
1&4
2&3
Press this button to raise the snowplow and
cancel the FLOAT mode. Function times out
after 4.8 seconds.
Press this button to lower the snowplow.
Release the button to stop blade at desired
height.
Press the LOWER button and hold 3/4 second
to activate this mode. The FLOAT indicator
light in the upper left corner of the control
face will illuminate. The blade will lower to the
ground surface and follow the contour of the
surface as it dips or raises. Function does not
time out, but control will shut down after 20
minutes of nonuse.
Press RAISE button momentarily to cancel
FLOAT. Angling left or right will not interrupt
(stop) the FLOAT function.
19
Press this button to angle the blade to the left.
Function times out after 9.6 seconds.
Press this button to angle the blade to the left.
Function times out after 9.6 seconds.
Used to access the SECURITY GUARD
system activation mode.
Used to clear the entered SECURITY GUARD
system code.
NOTE: If control function times out before desired
blade movement is complete, release button and
press again.
Lit. No. 41298, Rev. 00
May 1, 2010
HAND-HELD CONTROL with SECURITY GUARD™ Snowplow Anti-Theft System
SECURITY GUARD System
Activation & Establishing a 4-Digit
Security Code
NOTE: The snowplow must be
attached to the vehicle, and all the
electrical connections must be
connected prior to activating the
security code function.
1.
Turn the vehicle ignition switch
to the "ON" or "ACCESSORY"
position. (It is not necessary to
start the vehicle.)
2. Verify the control power indicator
is OFF. If the power indicator
light is red, the control is ON.
Press the ON/OFF button to turn
the hand-held control OFF.
3. To activate the
SECURITY GUARD mode,
press the control #1 button
four consecutive times, and
then press the #4 button four
consecutive times (sequence:
1, 1, 1, 1, 4, 4, 4, 4). The green
FLOAT light will flash quickly
and the red POWER light will
turn ON indicating the system
is ready to accept your 4-digit
security code. Enter your 4-digit
security code by pressing any of
the eight following buttons in any
sequence: UP, DOWN, LEFT,
RIGHT, 1, 2, 3 or 4.
Lit. No. 41298, Rev. 00
Once you have entered your
4-digit security code, the FLOAT
light will stop flashing and the
POWER light will turn OFF.
This indicates that your 4-digit
security code is entered and
stored in the SECURITY GUARD
system.
4. Once a 4-digit security code
is established and the plow/
vehicle electrical connection
are lost/disconnected, the
SECURITY GUARD system
will recognize any HT Series™
control that has been
programmed with the same
4-digit security code. Any control
not programmed with the correct
4-digit security code will require
the user to enter the established
security code before activating
the snowplow (see the Manual
Unlock procedure).
NOTE: If the control POWER
button is turned ON prior to
completing the programming
procedure, your 4-digit security
code will be cancelled.
Manual Unlock
If the SECURITY GUARD system
is activated and you are using a
HT Series™ control with a different
4-digit code than the established
security code, you will be required
to manually enter the 4-digit security
code before operating a locked
snowplow.
1.
Turn the vehicle ignition to the
"ON" or "ACCESSORY" position.
2. Turn the control on.
3. The POWER light will flash
rapidly, indicating that the
snowplow is locked.
4. Enter the 4-digit security code.
5. After entering the correct security
code, the POWER light will
change from flashing rapidly to a
solid light to indicate the snowplow
has been successfully unlocked.
NOTE: If the plow/vehicle electrical
connection is lost or disconnected,
the SECURITY GUARD system will
reset, requiring any HT Series™
control that is not programmed
with the established 4-digit
security code to manually re-enter
the security code to activate the
snowplow.
Clearing an Established 4-Digit
Security Code
1.
Turn the vehicle ignition switch
to the "ON" or "ACCESSORY"
position.
2. If the snowplow is locked (the
control POWER light will be
flashing at a fast rate), unlock the
snowplow by following the Manual
Unlock procedure.
3. Turn the control off. Verify that
the power indicator is OFF.
4. With the control OFF, press the
#2 button four consecutive times,
and then press the #3 button
four consecutive times. This
sequence (2, 2, 2, 2, 3, 3, 3, 3)
will clear the 4-digit security code
from the SECURITY GUARD
system. The FLOAT light will
flash to indicate that the 4-digit
security code was cleared.
NOTE: To enter a new 4-digit
security code see Activation &
Establishing a 4-Digit Security
Code.
May 1, 2010
20
HAND-HELD CONTROL with SECURITY GUARD™ Snowplow Anti-Theft System
Light Flash Indicators
POWER – Red
Additional Notes
Function
Off
Control is OFF
Solid On
Control is ON and active
Slow Flash
No communication
Fast Flash
Snowplow is locked – enter 4-digit
security code to unlock
FLOAT – Green
Function
Solid On
Float function is active
Fast Flash
Security code activation in progress
Lit. No. 41298, Rev. 00
• The SECURITY GUARD system
requires any HT Series™
control (other than the one with
the assigned 4-digit security
code) to enter the security
code before the snowplow
can be activated. Once the
security code is established,
the SECURITY GUARD system
recognizes that a control with the
same security code is attached,
and does not require a manual
unlock to activate the snowplow.
The system will recognize
the control as "safe" and will
automatically unlock.
• The SECURITY GUARD system
is only fully functional with
hand-held controls PN 49800.
• In the event that a snowplow is
locked and cannot be manually
unlocked or reset, contact your
Authorized Dealer.
• REMINDER: Record your
security code for future
reference.
21
May 1, 2010
JOYSTICK CONTROL with SECURITY GUARD™ Snowplow Anti-Theft System
WARNING
To prevent accidental
movement of the blade,
always move the ON/OFF
switch to OFF whenever the
snowplow is not in use. The
power indicator light will turn
OFF.
CONTROL OVERVIEW
The SECURITY GUARD feature was
developed as an electrical anti-theft
system for the half-ton snowplows.
The system provides a deterrent from
theft and/or non-permitted use by
allowing you to electronically lock the
snowplow's hydraulic functions.
All half-ton snowplow controls
come equipped with the
SECURITY GUARD system. To use
this function, you must complete the
"Activation" process.
Each control is equipped with an
ON/OFF switch and an indicator
light to show when the control is
powered ON or OFF. The controls
are powered by the vehicle's battery,
so your vehicle ignition (key) switch
must be ON to use the controls.
Lit. No. 41298, Rev. 00
Power Indicator
Light (red)
Float Light
(green)
Install the control as stated in the
Joystick Control Kit Installation
Instructions, and check all snowplow
functions as described below.
FLOAT
ON / OFF
RAISE
ON/OFF
Switch
(Emergency
Stop)
1
2
L
Before Activating the
SECURITY GUARD System:
R
OPERATING THE JOYSTICK
CONTROL
1.
3
4
LOWER
Turn the vehicle ignition switch
to the "ON" or "ACCESSORY"
position.
2. Move the slide switch on the
side of the control to the "ON"
position. The power indicator
light glows red, indicating the
control is ON. The indicator light
glows red whenever the control
and the vehicle ignition switch
are both ON and the electrical
connections to the snowplow are
completed.
Function Time-Outs
All control functions, except LOWER/
FLOAT, time out (stop) automatically
after a period of time. This is to
limit the amount of electrical energy
required from the vehicle.
NOTE: If control function
times out before desired blade
movement is complete, release
the lever to the center position,
then move back into the desired
function.
Automatic Shutdown
The control will automatically turn
OFF after being idle for 20 minutes.
To reactivate the control after a
shutdown, move the ON/OFF switch
to OFF, then back to ON.
The ON/OFF switch operates as
an emergency stop if required.
May 1, 2010
22
JOYSTICK CONTROL with SECURITY GUARD™ Snowplow Anti-Theft System
Smooth Stop
Float Light
(green)
The control automatically allows
the blade to coast to a stop when
the lever returns to center position.
This results in smoother operation,
reduces the shock to the hydraulic
system and increases hose and
valve life.
FLOAT
ON / OFF
RAISE
1
2
Control Lever Movement
From the center position, the control
lever can be moved in one of eight
(8) directions to control various
movements of the snowplow blade.
To change from one movement of
the blade to another, the control
lever must be moved back to the
center position before selecting the
desired function. Whenever the lever
is released, it should spring back into
the center position to stop any blade
movement.
L
R
3
4
LOWER
Control Functions
Raise, Lower, Float, Angle
Moving the control lever in straight
lines up and down or from side to
side on the control body will result in
the blade movements described in
the following tables.
Function Description of Operation
Move the control lever toward the top of the
control body to raise the snowplow and cancel
RAISE
the FLOAT mode. Function times out after
4.8 seconds.
Move the control lever toward the bottom
of the control body to lower the snowplow.
LOWER
Release the lever to stop blade at desired
height.
Move the control lever to the LOWER position
and hold 3/4 second to activate this mode. The
FLOAT indicator light in the upper right corner
of the control face will illuminate. The blade
will lower to the ground surface and follow
the contour of the surface as it dips or raises.
FLOAT
Function does not time out; however, control
will shut down after 20 minutes of nonuse.
Move lever to the RAISE position momentarily
to cancel FLOAT. Angling left or right will not
interrupt (stop) the FLOAT function.
Move the control lever straight to the left to
L
angle the blade left. Function times out after
(Angle Left)
9.6 seconds.
R
Move the control lever straight to the right to
(Angle
angle the blade right. Function times out after
Right)
9.6 seconds.
Used to access the SECURITY GUARD
1&4
system activation mode.
Used to clear the entered SECURITY GUARD
2&3
system code.
23
NOTE: If control function
times out before desired blade
movement is complete, release
the lever to the center position,
then move back into the desired
function.
Lit. No. 41298, Rev. 00
May 1, 2010
JOYSTICK CONTROL with SECURITY GUARD™ Snowplow Anti-Theft System
SECURITY GUARD System
Activation & Establishing a 4-Digit
Security Code
NOTE: The snowplow must be
attached to the vehicle, and all the
electrical connections must be
connected prior to activating the
security code function.
1.
Turn the vehicle ignition switch
to the "ON" or "ACCESSORY"
position. (It is not necessary to
start the vehicle.)
2. Verify the control power indicator
is OFF. If the power indicator
light is red, the control is ON.
Slide the ON/OFF switch to
"OFF" to turn the control OFF.
3. To activate the
SECURITY GUARD mode, move
the control lever into the #1
position four consecutive times,
and then in the direction of the
#4 position four consecutive
times (sequence:
1, 1, 1, 1, 4, 4, 4, 4). The green
FLOAT light will flash quickly and
the red POWER light will turn ON
indicating the system is ready to
accept your 4-digit security code.
Lit. No. 41298, Rev. 00
Enter your 4-digit security code
by moving the control lever into
the position of any of the eight
following positions: UP, DOWN,
LEFT, RIGHT, 1, 2, 3 or 4.
Once you have entered your
4-digit security code, the FLOAT
light will stop flashing and the
POWER light will turn OFF.
This indicates that your 4-digit
security code is entered and
stored in the SECURITY GUARD
system.
4. Once a 4-digit security code
is established and the plow/
vehicle electrical connection
are lost/disconnected, the
SECURITY GUARD system
will recognize any HT Series™
control that has been
programmed with the same
4-digit security code. Any control
not programmed with the correct
4-digit security code will require
the user to enter the established
security code before activating
the snowplow (see the Manual
Unlock procedure).
NOTE: If the control POWER
switch is turned ON prior to
completing the programming
procedure, your 4-digit security
code will be cancelled.
Manual Unlock
If the SECURITY GUARD system
is activated and you are using a
HT Series™ control with a different
4-digit code than the established
security code, you will be required
to manually enter the 4-digit security
code before operating a locked
snowplow.
1.
Turn the vehicle ignition to the
"ON" or "ACCESSORY" position.
2. Slide the control switch to the
"ON" position.
3. The POWER light will flash
rapidly, indicating that the
snowplow is locked.
4. Enter the 4-digit security code.
5. After entering the correct security
code, the POWER light will
change from flashing rapidly to a
solid light to indicate the snowplow
has been successfully unlocked.
NOTE: If the plow/vehicle electrical
connection is lost or disconnected,
the SECURITY GUARD system
will reset, requiring any HT Series
control that is not programmed
with the established 4-digit
security code to manually re-enter
the security code to activate the
snowplow.
Clearing an Established 4-Digit
Security Code
1.
Turn the vehicle ignition switch
to the "ON" or "ACCESSORY"
position.
2. If the snowplow is locked (the
control POWER light will be
flashing at a fast rate), unlock the
snowplow by following the Manual
Unlock procedure.
3. Slide the control switch to the
"OFF" position. Verify that the
power indicator is OFF.
4. With the control OFF, move
the control lever to the #2
position four consecutive times,
and then to the #3 position
four consecutive times. This
sequence (2, 2, 2, 2, 3, 3, 3, 3)
will clear the 4-digit security code
from the SECURITY GUARD
system. The FLOAT light will
flash to indicate that the 4-digit
security code was cleared.
NOTE: To enter a new 4-digit
security code see Activation &
Establishing a 4-Digit Security
Code.
May 1, 2010
24
JOYSTICK CONTROL with SECURITY GUARD™ Snowplow Anti-Theft System
Light Flash Indicators
POWER – Red
Additional Notes
Function
Off
Control is OFF
Solid On
Control is ON and active
Slow Flash
No communication
Fast Flash
Snowplow is locked – enter 4-digit
security code to unlock
FLOAT – Green
Function
Solid On
Float function is active
Fast Flash
Security code activation in progress
Lit. No. 41298, Rev. 00
• The SECURITY GUARD system
requires any HT Series™
control (other than the one with
the assigned 4-digit security
code) to enter the security
code before the snowplow
can be activated. Once the
security code is established,
the SECURITY GUARD system
recognizes that a control with the
same security code is attached,
and does not require a manual
unlock to activate the snowplow.
The system will recognize
the control as "safe" and will
automatically unlock.
• The SECURITY GUARD system
is only fully functional with
joystick controls PN 49700.
• In the event that a snowplow is
locked and cannot be manually
unlocked or reset, contact your
Authorized Dealer.
• REMINDER: Record your
security code for future
reference.
25
May 1, 2010
HAND-HELD MASTER CONTROL FOR THE SECURITY GUARD™ Snowplow Anti-Theft System
WARNING
To prevent accidental
movement of the blade,
always push the ON/OFF
button to switch the control
OFF whenever the snowplow
is not in use. The power
indicator light will turn OFF.
UNIVERSAL CLEAR
SECURITY
Perform the following steps to unlock
and clear an established security
code, without using the original
control that was used to establish the
code. This procedure should be used
to reset the module if the security
code is unknown.
IMPORTANT: The following
steps must be performed using
the Distributor Master Control
(PN 48800). Only the Distributor
Master Control can clear an
established code within a snowplow
module without using the original
control used to establish the code.
1.
Turn the vehicle ignition to the
"OFF" position.
Master Control
Plate
2. With the control power OFF,
using the tool that was included
in the Distributor Master Control
box, place the tool over the
keypad and push down on the
plate.
Position the
Master Control Plate
over the keypad.
NOTE: The only button that
should be exposed is the LOWER
button. All other buttons should
be engaged and pressed down.
3. While pushing down on the tool
engaging all functions except
LOWER, turn the ignition ON.
Align the plate so that
only the LOWER button
on the keypad is exposed.
26
LOWER Button
4. Upon turning the ignition to
the "ON" position, the module
has been reset, and there is no
security code associated with the
snowplow.
Master Control
Plate
Keypad
FLOAT
ON/OFF
AIS
Master Control
Plate aligned
on the keypad.
LOWER
LOWER Button
Lit. No. 41298, Rev. 00
May 1, 2010
THEORY OF OPERATION
SNOWPLOW HYDRAULICS
The HT Series™ snowplow hydraulic
system performs four blade
movements.
All movements require the vehicle
ignition (key) switch to be in the run
or accessory position and the power
to be activated on the snowplow cab
control.
Three of the four hydraulic
movements require energizing
the electric motor and appropriate
solenoid cartridge valves. The fourth
function, lower, does not energize
the motor but requires activating a
cartridge valve.
Power from the vehicle battery
is supplied to the solenoid coils
and the snowplow control via the
Isolation Module. The solenoid
cartridge valves operate in various
combinations, directed by the cab
control, to send hydraulic fluid to the
snowplow lift and angle rams and/or
back to the reservoir.
BLADE
MOVEMENT
Lit. No. 41298, Rev. 00
RAISE
LOWER
Snowplow Daytime Running
Lights
Because Daytime Running Lamps
(DRLs) are controlled differently on
some vehicles, two Isolation Modules
have been developed.
The standard Isolation Module
transfers the DRL output from the
vehicle headlamps to the snowplow
lights when the vehicle ignition switch
is turned on and the snowplow is
attached.
The second Isolation Module,
designed for vehicles with dedicated
DRL bulbs, senses the vehicle in the
DRL mode and a series of relays
energize, placing the snowplow
low beams in series. This Isolation
Module does not turn off the vehicle's
dedicated DRLs.
ANGLE
RIGHT
ANGLE
LEFT
3-PORT MODULE ELECTRICAL
Overview
The Isolation Module acts as an
electrical hub, automatically directing
vehicle power to the appropriate
vehicle or snowplow lighting devices,
while also supplying battery power to
the snowplow control.
The vehicle high and low beams
enter and exit the Isolation Module
through positions B (left side lighting)
and position C (right side lighting).
Park, turn, and DRL signals also
enter through positions B and C.
The output of the vehicle high beam/
low beam select switch is directed to
the Isolation Module via the plug-in
harness. When the snowplow is not
attached to the vehicle, the signal
passes through the normally closed
relay contacts to the vehicle headlamps.
During this time, the Isolation Module is
inactive, placing no current draw on the
vehicle's electrical system.
Turning on the vehicle parking
lights activates a series of relays,
automatically transferring the vehicle
high and low beams to the snowplow
while supplying battery power directly
to the snowplow parking lights. All
snowplow lighting exits the Isolation
Module through position A.
Turning on the vehicle ignition switch
energizes a snowplow control relay,
supplying vehicle battery power
directly to the control via the vehicle
control harness and plug-in harness.
The vehicle ignition switch also
supplies power to the vehicle turn
signals. Activating the vehicle turn
signals energizes turn signal circuit,
which supply vehicle battery power
directly to the snowplow turn signals.
With the snowplow attached, the
Isolation Module is still inactive until
either of the two following conditions
are met: the vehicle parking lights
are turned on or the vehicle ignition
switch is turned ON.
May 1, 2010
27
THEORY OF OPERATION
3-PORT MODULE ELECTRICAL
White Label NonDRL Module
(PN 29060)
NOTE: Module has been replaced
by PN 29070-1
Snowplow not attached to vehicle:
System is inactive. Vehicle lighting
system functions normally. Reason:
No ground to module.
Snowplow attached to vehicle:
System is inactive until either the
switched accessory wire or the vehicle
parking lights are activated. Vehicle and
snowplow lighting systems function
as outlined in the Theory of Operation
Overview. Reason: ground path is
established from battery common to
Pin C on Port A of the 3-port module
via the following harnesses: vehicle
battery cable, vehicle control
harness, plug-in harness, vehicle
lighting harness and snowplow
lighting harness.
Lit. No. 41298, Rev. 00
• Activating a switched accessory
wire (a key-controlled power
source) applies battery voltage
to the VACC input of the module,
which energizes the coil of the
control power relay (part of the
3-port module). Energizing the
coil of the control power relay
causes the relay contacts to shift
from the "N.O." (normally opened)
position to the "N.C." (normally
closed) position, which supplies
battery voltage to the snowplow
control via the plug-in harness
and the vehicle control harness.
The switched accessory wire only
controls battery voltage to the
snowplow control.
• Activating the vehicle park light
circuit applies battery voltage
to the module park circuit input.
The voltage is applied to a
solid state power device, which
causes the device to turn ON
and apply battery voltage to the
snowplow park lamp filaments
via the vehicle and snowplow
lighting harnesses. Voltage is
also applied to the module's
high and low beam relay coils,
which causes the relay contacts
to shift from the "vehicle" to the
"snowplow" position.
• With the four headlamp relays
shifted to the "snowplow"
position, the vehicle high and
low beams are now directed to
the snowplow headlamps via the
vehicle and snowplow lighting
harnesses. Toggling the dimmer
switch between high and low
beam will toggle the snowplow
high and low beams.
• Activating the turn signal
applies battery voltage to the
module turn signal circuit input.
The voltage is applied to a
solid state power device, which
causes the device to turn ON
and apply battery voltage to
the snowplow turn signal lamp
filaments via the vehicle and
snowplow lighting harnesses.
• On vehicles equipped with
DRLs—either integrated into the
vehicle headlamps or separated
into dedicated DRL lamps—this
module will not turn OFF the
vehicle DRLs or transfer them to
the snowplow. DRLs will remain
on the vehicle and operate as the
vehicle manufacturer intended.
May 1, 2010
28
THEORY OF OPERATION
3-PORT MODULE ELECTRICAL
Green Label DRL Module
(PN 29070-1)
Snowplow not attached to vehicle:
System is inactive. Vehicle lighting
system functions normally. Reason:
No ground to module.
Snowplow attached to vehicle:
System is inactive until either the
switched accessory wire or the
vehicle parking lights are activated.
Vehicle and snowplow lighting
systems function as outlined in the
Theory of Operation Overview.
Reason: ground path is established
from battery common to Pin C on
Port A of the 3-port module via the
following harnesses: vehicle battery
cable, vehicle control harness,
adapter, plug-in harness, vehicle
lighting harness and snowplow
lighting harness.
Lit. No. 41298, Rev. 00
• Activating a switched accessory
wire (a key-controlled power
source) applies battery voltage to
the VACC input of the module. A
control circuit senses the voltage
and energizes the coil of the
control power relay (part of the
3-port module). Energizing the
coil of the control power relay
causes the relay contacts to shift
from the "N.O." (normally opened)
position to the "N.C." (normally
closed) position, which supplies
battery voltage to the snowplow
control via the plug-in harness
and the vehicle control harness.
The switched accessory wire only
controls battery voltage to the
snowplow control.
• Activating the vehicle park
light circuit applies voltage to
the module park circuit input. A
control circuit senses the voltage
and turns ON a solid state power
device, which applies battery
voltage to the snowplow park
lamp filaments via the vehicle and
snowplow lighting harnesses.
• With the park light circuit
energized, the control circuit
monitors the vehicle high
and low beam inputs. When
battery voltage is sensed, the
appropriate solid state power
devices are turned ON, supplying
battery voltage to the snowplow
headlamps via the vehicle and
snowplow lighting harnesses.
Toggling the dimmer switch
between high and low beam will
toggle the snowplow high and
low beams.
• Activating the turn signal applies
voltage to the module turn signal
circuit input. A control circuit
senses the voltage and turns
ON a solid state power device,
which applies battery voltage to
the snowplow turn signal lamp
filaments via the vehicle and
snowplow lighting harnesses.
• PN 29070-1 Only: On vehicles
equipped with DRLs integrated
into the vehicle headlamps.
Activation of the switched
accessory wire (a key-controlled
power source) Port C, Position C,
applies battery voltage to the
module's high and low beam
relay coils, which causes the
relay contacts to shift from the
"vehicle" to the "snowplow"
position. This module will
transfer the vehicle headlamp
DRLs to the snowplow (turns
off vehicle DRLs).
• On vehicles equipped with
dedicated DRL bulbs or
vehicles using the turn signals
as DRLs, this module will not
turn OFF the vehicle bulbs.
While the vehicle is in the
DRL mode, this module will
illuminate the snowplow light
turn signal filaments.
May 1, 2010
29
THEORY OF OPERATION
3-PORT MODULE ELECTRICAL
Blue Label Module
(PN 29760-1)
NOTE: Limited vehicle application.
According to the vehicle
manufacturer, all 2008 Ford Super
Duty F-250/350/450/550 trucks
built before 04/18/2007 will require
this module. Trucks built after
that date and having the Plow
Prep Package use the green label
module (PN 29070-1).
Snowplow not attached to vehicle:
System is inactive. Vehicle lighting
system functions normally.
Snowplow attached to vehicle and
the electrical connections at the
grille are made:
System is inactive until either the
vehicle ignition switch or the vehicle
parking lights are activated. Vehicle
and snowplow lighting systems
function as outlined in the Theory of
Operation Overview.
Lit. No. 41298, Rev. 00
• Turning on the vehicle ignition
switch provides 12V to the
switched accessory wire, which
in turn applies battery voltage to
the VACC input to the module
at Port C, Pin C. A control
circuit senses the voltage and
energizes the coil of the module
control power relay. Energizing
the coil of the control power relay
causes the relay contacts to shift
from the "N.C." (normally closed)
position to the "N.O." (normally
opened) position, which supplies
battery voltage to the snowplow
control via the plug-in harness
and the vehicle control harness.
The switched accessory wire
only controls battery voltage to
the snowplow control.
• Activating the vehicle park
light circuit applies battery
voltage to the module park
circuit input, Port B, Pin H. The
voltage is applied to a solid
state power device, which
causes the device to turn ON
and apply battery voltage to the
snowplow park lamp filaments
via the vehicle and snowplow
lighting harnesses. Voltage is
also applied to the module's
high and low beam relay coils,
which causes the relay contacts
to shift from the "vehicle" to the
"snowplow" position.
• With the headlamp relays shifted
to the "snowplow" position, the
vehicle high and low beams
are now directed to the snowplow
headlamps via the vehicle and
snowplow lighting harnesses.
Toggling the dimmer switch
between high and low beam will
toggle the snowplow high and
low beams.
• Activating the turn signal
applies battery voltage to the
module turn signal circuit input.
Left: Port B, Position G; Right:
Port C, Position G. The voltage
is applied to a solid state power
device, which causes the device
to turn ON and apply battery
voltage to the snowplow turn
signal lamp filaments via the
vehicle and snowplow lighting
harnesses.
• On vehicles equipped with
DRLs integrated into the
vehicle headlamps, activating
a switched accessory wire (a
key-controlled power source)
applies battery voltage to the
module's high and low beam
relay coils, which causes the
relay contacts to shift from the
"vehicle" to the "snowplow"
position. This module will
transfer the vehicle headlamp
DRLs to the snowplow.
May 1, 2010
30
ELECTRICAL & HYDRAULIC SCHEMATICS
This section contains hydraulic and
electrical schematics to help explain
how the hydraulic unit performs the
different functions. A schematic
is an abstract drawing showing
the purpose of each component
in the system. Each component is
represented by a graphical symbol.
The hydraulic and electrical legends
describe each symbol used in the
schematics for this guide.
ELECTRICAL LEGEND
CROSSING WIRE
LINE, WORKING (MAIN)
SPRING
WIRE SPLICE
LINES JOINING
SOLENOID, SINGLE WINDING
LINES CROSSING
IN LINE CONNECTOR
SOLENOID COIL
VALVE, FLOW CONTROL,
ADJUSTABLENON-COMPENSATED
MOTOR RELAY
HYDRAULIC PUMP
FIXED DISPLACEMENT
MOTOR
CYLINDER
VALVE, TWO POSITION,
THREE CONNECTION
(THREE WAY)
ELECTRIC MOTOR
VALVE, TWO POSITION,
FOUR CONNECTION
(FOUR WAY)
HEADLAMP
PARK/TURN LAMP
FILTER, STRAINER,
DIFFUSER
ORIFICE PLATE
PRINTED CIRCUIT BOARD
COMPONENT ENCLOSURE
COMPONENT ENCLOSURE
Wire Color Code
Lit. No. 41298, Rev. 00
VALVE, TWO POSITION,
TWO CONNECTION
(TWO WAY)
BATTERY
H
NOTE: Left Side = Driver's Side (DS)
Right Side = Passenger's
Side (PS)
Black
Black w/ Orange
Black w/ Red
Black w/ White
Blue
VALVE, ADJUSTABLE
PRESSURE RELIEF
LINE, TO RESERVOIR
BELOW FLUID LEVEL
CIRCUIT GROUND
L
• Shaded components are either
activated or shifted from their
normal position.
BLK
BLK/ORN
BLK/RED
BLK/WHT
BLU
PILOT OPERATED (P/O)
CHECK VALVE
FLOW, DIRECTION OF
HYDRAULIC FLUID
FUSE
The first two schematics show an
overview of the complete electrical and
hydraulic systems. Other schematics
highlight the flow of hydraulic oil and
electrical current for each function
the hydraulic unit performs as well as
the flow of electrical current for the
snowplow and vehicle lights.
• Bold lines and gray lines
(ground) represent the circuit
being activated only.
HYDRAULIC LEGEND
CHECK VALVE
Abbreviations
BLU/ORN
BRN
BRN/GRN
BRN/RED
GRN
Blue w/ Orange
Brown
Brown w/ Green
Brown w/ Red
Green
GRY
LTBLU
LTGRN
ORN
PNK
Gray
Light Blue
Light Green
Orange
Pink
PUR
RED
WHT
WHT/YEL
YEL
Purple
Red
White
White w/ Yellow
Yellow
DRL
MTR RLY
P/T SIG
Daytime Running Lamps
Motor Relay
Park / Turn Signal
May 1, 2010
31
SYSTEM OVERVIEW – ELECTRICAL
WIRING – 3-PORT MODULE
CAUTION
Factory Vehicle Harness
On 2-plug electrical systems,
plug covers shall be used
whenever snowplow is
disconnected. Cable is 12-volt
unfused source.
Park/Turn
Lamps
BLK
Battery
Vehicle
Headlamps
Vehicle Battery Cable
RED
BAT
32
Vehicle Control Harness
To Snowplow Control
D
RE
Vehicle Lighting
Harness
(11-Pin)
Vehicle
Headlamps
To Switched
Accessory
Turn Signal
Configuration Plug
Typical Plug-In Harness
10.0-Amp Fuses
(Snowplow Park/Turn &
Snowplow Control)
Park/Turn
Lamps
Factory Vehicle Harness
Lit. No. 41298, Rev. 00
Fire Wall
3-Port Module
(Non-DRL or DRL)
NOTE: The Isolation Module shown on the driver's side for illustration
purposes only. Location may be different for the vehicle.
May 1, 2010
ELECTRICAL SCHEMATIC – 3-PORT MODULE
Snowplow Assembly
–
WHT
S2
GRN
RED
BLU
RED
A
B
C
D
E
F
G
H
J
K
Blank
Connector
A
B
C
D
E
F
G
H
J
K
A
B
C
D
E
F
G
H
J
K
B
LOW-VA
COM-VJ
HIGH-VB
HIGH-CD
COM-BK
LOW-AE
TURN-VA
Typical
Plug-In
Harness
TURN-VB
PARK-VH
HIGH-CD
COM-BK
LOW-AE
LOW-VA
COM-VJ
HIGH-VB
HIGH-3C
COM-5B
LOW-1A
Driver-Side Plow Lamp
C
B
A
HIGH
LOW
BEAM
TURN
PARK
C
B
A
HIGH-4C
COM-11B
LOW-6A
PARK
TURN-8B
COM
Lit. No. 41298, Rev. 00
3 4 5
(Pins)
1
2
8
9 10 11
6
C
B
A
HIGH
LOW
BEAM
7
TURN-9B
COM
BLK
RED
RED
BLK
RED
3
4
1
1
2
1 – Red
2 – Green
3 – White
4 – Black
Control
Located at Front of Vehicle
LOW-1A
COM
HIGH-3C
HIGH-4C
COM-5B
LOW-6A
COM
TURN-8B
TURN-9B
PARK
COM-11B
Plow
Lighting
Harness,
11 Pin
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
BLK/WHT
BLK/ORN
WHT/YEL
WHT
BLU/ORN
BLK
BLK/ORN
GRY
PUR
BRN
LTBLU
Vehicle
Lighting
Harness,
11 Pin
RED
RED
BLK
BLK
1
2
3
4
1 RED
2 GRN
3 WHT
4 BLK
4-Pin Plug
(Under Dash)
On 2-plug electrical systems, plug covers shall
be used whenever snowplow is disconnected.
Cable is 12-volt unfused source.
C
Passenger-Side Plow Lamp
D
C
B
A
CAUTION
Plow (End View)
C
B
A
3
2
Vehicle Control Harness, 4 Wire
Plow Module
PARK
4
(connector face view)
A BCD
To Switched Accessory Lead
RED
ABCD
COM
12V
ACC-DC
SWV-CC
S1
Battery
D
C
B
A
4 Amp Fuse: S1, S2, S3
4 Amp Fuse: Motor Relay
BLK
RED
PARK
TURN
TAN
BLK
WHT
A
1 – Red (Control Power)
2 – Red (Twisted with #3)
3 – Black (Twisted with #2)
4 – Black (Control Ground)
+
BLK/ORN
BLK
A
B
C
D
E
F
G
H
J
K
2
3
(Sockets)
Motor
Relay
S3
BLK
1
TAN
WHT
RED
RED
A
B
C
D
E
F
G
H
J
K
4
+
RED
RED
RED
Pump –
Motor
Vehicle Battery Cable, 4 Receptacle
Plow (End View)
BLK
10 Amp
Control
& Module
Fuses
Reversible
Turn Signal
Plug
12V
12V
LOW-VA
HIGH-VB
ACC-DC
HIGH-CD
LOW-AE
F2-CF
TURN-AG
C
COM-BJ
COM-BK
A
B
C
D
E
F
G
H
J
K
LOW-VA
HIGH-VB
SWV-CC
HIGH-CD
LOW-AE
F1-BF
TURN-BG
PARK-VH
COM-BJ
COM-BK
A
B
C
D
E
F
G
H
J
K
WHT
BLK
BLK/ORN
WHT/YEL
BLK/WHT
PUR
GRY
BRN
LTBLU
BLU/ORN
A
B
C
D
E
F
G
H
J
K
A
B
C
D
E
F
G
H
J
K
B
A
B
C
D
E
F
G
H
J
K
A
A
B
C
D
E
F
G
H
J
K
33
LOW BEAM IN
HIGH BEAM IN
SWITCHED VACC IN
HIGH BEAM OUT
LOW BEAM OUT
MODULE POWER IN
TURN IN
DRL IN
COM IN
COM OUT
LOW BEAM IN
HIGH BEAM IN
CONTROL PWR OUT
HIGH BEAM OUT
LOW BEAM OUT
CONTROL POWER IN
TURN IN
PARK LAMP IN
COM IN
COM OUT
LEFT HIGH BEAM OUT
LEFT LOW BEAM OUT
MODULE COM IN
RIGHT HIGH BEAM OUT
RIGHT LOW BEAM OUT
RIGHT TURN OUT
LEFT TURN OUT
PARK LAMP OUT
LEFT HEADLAMP COM
RIGHT HEADLAMP COM
Isolation Module
NOTE: Labeling shown (left and right) is correct for modules located on the driver's side of
the vehicle. The reversible turn signal plug must be reversed for passenger-side installations.
May 1, 2010
LOW BEAM HEADLAMPS WITH SNOWPLOW CONNECTED TO VEHICLE (3-PORT MODULE)
Snowplow Assembly
S1
WHT
S2
GRN
RED
BLU
RED
A
B
C
D
E
F
G
H
J
K
A
B
C
D
E
F
G
H
J
K
A
B
C
D
E
F
G
H
J
K
B
LOW-VA
COM-VJ
HIGH-VB
HIGH-CD
COM-BK
LOW-AE
TURN-VA
Typical
Plug-In
Harness
TURN-VB
PARK-VH
HIGH-CD
COM-BK
LOW-AE
LOW-VA
COM-VJ
HIGH-VB
HIGH-3C
COM-5B
LOW-1A
Driver-Side Plow Lamp
C
B
A
HIGH
LOW
BEAM
TURN
PARK
C
B
A
HIGH-4C
COM-11B
LOW-6A
PARK
TURN-8B
COM
Lit. No. 41298, Rev. 00
3 4 5
(Pins)
1
7
2
8
9 10 11
6
C
B
A
HIGH
LOW
BEAM
RED
D
C
B
A
BLK
RED
RED
BLK
3
4
1
1
2
1 – Red
2 – Green
3 – White
4 – Black
Control
RED
RED
BLK
BLK
Located at Front of Vehicle
LOW-1A
COM
HIGH-3C
HIGH-4C
COM-5B
LOW-6A
COM
TURN-8B
TURN-9B
PARK
COM-11B
Plow
Lighting
Harness,
11 Pin
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
BLK/WHT
BLK/ORN
WHT/YEL
WHT
BLU/ORN
BLK
BLK/ORN
GRY
PUR
BRN
LTBLU
Vehicle
Lighting
Harness,
11 Pin
1
2
3
4
1 RED
2 GRN
3 WHT
4 BLK
4-Pin Plug
(Under Dash)
On 2-plug electrical systems, plug covers shall
be used whenever snowplow is disconnected.
Cable is 12-volt unfused source.
C
Passenger-Side Plow Lamp
TURN-9B
COM
3
2
(connector face view)
CAUTION
Plow (End View)
C
B
A
4
Vehicle Control Harness, 4 Wire
Plow Module
PARK
1 – Red (Control Power)
2 – Red (Twisted with #3)
3 – Black (Twisted with #2)
4 – Black (Control Ground)
+
Battery
D
C
B
A
4 Amp Fuse: S1, S2, S3
4 Amp Fuse: Motor Relay
BLK
RED
PARK
TURN
TAN
BLK
A
WHT
2
3
(Sockets)
–
A BCD
To Switched Accessory Lead
RED
ABCD
COM
12V
ACC-DC
SWV-CC
BLK
A
B
C
D
E
F
G
H
J
K
BLK/ORN
Motor
Relay
S3
BLK
1
TAN
WHT
RED
RED
A
B
C
D
E
F
G
H
J
K
4
+
RED
RED
RED
Pump –
Motor
Vehicle Battery Cable, 4 Receptacle
Plow (End View)
BLK
10 Amp
Control
& Module
Fuses
Reversible
Turn Signal
Plug
12V
12V
LOW-VA
HIGH-VB
ACC-DC
HIGH-CD
LOW-AE
F2-CF
TURN-AG
C
COM-BJ
COM-BK
A
B
C
D
E
F
G
H
J
K
LOW-VA
HIGH-VB
SWV-CC
HIGH-CD
LOW-AE
F1-BF
TURN-BG
PARK-VH
COM-BJ
COM-BK
A
B
C
D
E
F
G
H
J
K
WHT
BLK
BLK/ORN
WHT/YEL
BLK/WHT
PUR
GRY
BRN
LTBLU
BLU/ORN
A
B
C
D
E
F
G
H
J
K
A
B
C
D
E
F
G
H
J
K
B
A
B
C
D
E
F
G
H
J
K
A
A
B
C
D
E
F
G
H
J
K
34
LOW BEAM IN
HIGH BEAM IN
SWITCHED VACC IN
HIGH BEAM OUT
LOW BEAM OUT
MODULE POWER IN
TURN IN
DRL IN
COM IN
COM OUT
LOW BEAM IN
HIGH BEAM IN
CONTROL PWR OUT
HIGH BEAM OUT
LOW BEAM OUT
CONTROL POWER IN
TURN IN
PARK LAMP IN
COM IN
COM OUT
LEFT HIGH BEAM OUT
LEFT LOW BEAM OUT
MODULE COM IN
RIGHT HIGH BEAM OUT
RIGHT LOW BEAM OUT
RIGHT TURN OUT
LEFT TURN OUT
PARK LAMP OUT
LEFT HEADLAMP COM
RIGHT HEADLAMP COM
Isolation Module
NOTE: Labeling shown (left and right) is correct for modules located on the driver's side of
the vehicle. The reversible turn signal plug must be reversed for passenger-side installations.
May 1, 2010
HIGH BEAM HEADLAMPS WITH SNOWPLOW CONNECTED TO VEHICLE (3-PORT MODULE)
Snowplow Assembly
–
WHT
S2
GRN
RED
BLU
RED
A
B
C
D
E
F
G
H
J
K
A
B
C
D
E
F
G
H
J
K
A
B
C
D
E
F
G
H
J
K
LOW-VA
COM-VJ
HIGH-VB
HIGH-CD
COM-BK
LOW-AE
TURN-VA
C
Typical
Plug-In
Harness
TURN-VB
PARK-VH
HIGH-CD
COM-BK
LOW-AE
LOW-VA
COM-VJ
HIGH-VB
C
B
A
HIGH
LOW
BEAM
HIGH-3C
COM-5B
LOW-1A
Driver-Side Plow Lamp
C
B
A
HIGH
LOW
BEAM
TURN
PARK
C
B
A
HIGH-4C
COM-11B
LOW-6A
PARK
TURN-8B
COM
Lit. No. 41298, Rev. 00
3 4 5
(Pins)
2
1
TURN-9B
COM
8
C
B
A
7
PARK
9 10 11
6
Plow (End View)
Passenger-Side Plow Lamp
BLK
RED
RED
BLK
Located at Front of Vehicle
LOW-1A
COM
HIGH-3C
HIGH-4C
COM-5B
LOW-6A
COM
TURN-8B
TURN-9B
PARK
COM-11B
Plow
Lighting
Harness,
11 Pin
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
RED
3
4
1
1
2
1 – Red
2 – Green
3 – White
4 – Black
Control
BLK/WHT
BLK/ORN
WHT/YEL
WHT
BLU/ORN
BLK
BLK/ORN
GRY
PUR
BRN
LTBLU
Vehicle
Lighting
Harness,
11 Pin
RED
RED
BLK
BLK
1
2
3
4
1 RED
2 GRN
3 WHT
4 BLK
4-Pin Plug
(Under Dash)
A BCD
On 2-plug electrical systems, plug covers shall
be used whenever snowplow is disconnected.
Cable is 12-volt unfused source.
Plow Module
3
2
Vehicle Control Harness, 4 Wire
D
C
B
A
CAUTION
B
4
(connector face view)
To Switched Accessory Lead
RED
ABCD
COM
12V
ACC-DC
SWV-CC
S1
Battery
D
C
B
A
4 Amp Fuse: S1, S2, S3
4 Amp Fuse: Motor Relay
BLK
RED
PARK
TURN
TAN
BLK
WHT
A
1 – Red (Control Power)
2 – Red (Twisted with #3)
3 – Black (Twisted with #2)
4 – Black (Control Ground)
+
BLK/ORN
BLK
A
B
C
D
E
F
G
H
J
K
2
3
(Sockets)
Motor
Relay
S3
BLK
1
TAN
WHT
RED
RED
A
B
C
D
E
F
G
H
J
K
4
+
RED
RED
RED
Pump –
Motor
Vehicle Battery Cable, 4 Receptacle
Plow (End View)
BLK
10 Amp
Control
& Module
Fuses
Reversible
Turn Signal
Plug
12V
12V
LOW-VA
HIGH-VB
ACC-DC
HIGH-CD
LOW-AE
F2-CF
TURN-AG
C
COM-BJ
COM-BK
A
B
C
D
E
F
G
H
J
K
LOW-VA
HIGH-VB
SWV-CC
HIGH-CD
LOW-AE
F1-BF
TURN-BG
PARK-VH
COM-BJ
COM-BK
A
B
C
D
E
F
G
H
J
K
WHT
BLK
BLK/ORN
WHT/YEL
BLK/WHT
PUR
GRY
BRN
LTBLU
BLU/ORN
A
B
C
D
E
F
G
H
J
K
A
B
C
D
E
F
G
H
J
K
B
A
B
C
D
E
F
G
H
J
K
A
A
B
C
D
E
F
G
H
J
K
35
LOW BEAM IN
HIGH BEAM IN
SWITCHED VACC IN
HIGH BEAM OUT
LOW BEAM OUT
MODULE POWER IN
TURN IN
DRL IN
COM IN
COM OUT
LOW BEAM IN
HIGH BEAM IN
CONTROL PWR OUT
HIGH BEAM OUT
LOW BEAM OUT
CONTROL POWER IN
TURN IN
PARK LAMP IN
COM IN
COM OUT
LEFT HIGH BEAM OUT
LEFT LOW BEAM OUT
MODULE COM IN
RIGHT HIGH BEAM OUT
RIGHT LOW BEAM OUT
RIGHT TURN OUT
LEFT TURN OUT
PARK LAMP OUT
LEFT HEADLAMP COM
RIGHT HEADLAMP COM
Isolation Module
NOTE: Labeling shown (left and right) is correct for modules located on the driver's side of
the vehicle. The reversible turn signal plug must be reversed for passenger-side installations.
May 1, 2010
THEORY OF OPERATION
4-PORT MODULE ELECTRICAL
Snowplow Headlamps
The Isolation Module acts as an
electrical hub, automatically directing
vehicle power to the appropriate
vehicle or snowplow lighting devices,
while also supplying battery power to
the snowplow control.
The vehicle high and low beams
enter and exit the Isolation Module
through positions 3 (left-side lighting)
and position 4 (right-side lighting).
Park, turn and DRL signals also
enter through positions 3 and 4. The
output of the vehicle dimmer switch
is directed to the Isolation Module via
the long and short plug-in harnesses.
All snowplow lighting exits the
Isolation Module through position 2.
When the snowplow is not attached
to the vehicle, the signal passes
through the normally closed relay
contacts to the vehicle headlamps.
During this time, the Isolation Module
is inactive, placing no current draw
on the vehicle's electrical system.
Lit. No. 41298, Rev. 00
With the snowplow attached, the
Isolation Module is still inactive until
either of the two following conditions
are met: The vehicle parking lights
are turned on or the vehicle ignition
switch is turned on.
Turning on the vehicle parking
lights activates a series of relays,
automatically transferring the vehicle
high and low beams to the snowplow
while supplying battery power directly
to the snowplow parking lights.
Turning on the vehicle ignition switch
energizes a snowplow control relay,
supplying vehicle battery power
directly to the control via the vehicle
control harness. The vehicle ignition
switch also supplies power to the
vehicle turn signals. Activating
the vehicle turn signals energizes
turn signal relays, which supply
vehicle battery power directly to the
snowplow turn signals.
36
May 1, 2010
SYSTEM OVERVIEW – ELECTRICAL
WIRING – 4-PORT MODULE
CAUTION
Factory Vehicle Harness
On 2-plug electrical systems,
plug covers shall be used
whenever snowplow is
disconnected. Cable is 12-volt
unfused source.
Park/Turn
Lamps
BLK
Battery
Vehicle
Headlamps
RED
BAT
37
PN 29175
Adapter
Vehicle Control Harness
7.5-Amp Fuse (Control)
D
Vehicle Lighting Harness (11-Pin)
To Snowplow
Control
RE
Long Plug-In Harness
Vehicle Battery Cable
15-Amp Fuse (Park/Turn)
Vehicle
Headlamps
To Switched
Accessory
Short Plug-In Harness
Fire Wall
4
Park/Turn
Lamps
2
1
Isolation Module
Factory Vehicle Harness
Lit. No. 41298, Rev. 00
3
NOTE: The Isolation Module and short plug-in harness, containing the
park and DRL lamp wire, are shown on the driver's side for illustration
purposes only. Location may be different for the vehicle.
May 1, 2010
ELECTRICAL SCHEMATIC – 4-PORT MODULE
Snowplow Assembly
BLK
1
Motor
Relay
BLK
S1
WHT
S2
GRN
S3
BLU
RED
RED
A
B
C
D
E
F
G
H
J
K
A
B
C
D
E
F
G
H
J
K
4
3
3
4
2
1
1
2
1 – Red
2 – Green
3 – White
4 – Black
Control
(connector face view)
Vehicle Control Harness, 4 Wire
D
C
B
A
4 Amp Fuse: S1, S2, S3
4 Amp Fuse: Motor Relay
BLK
RED
1 – Red (Control Power)
2 – Red (Twisted with #3)
3 – Black (Twisted with #2)
4 – Black (Control Ground)
+
Battery
RED
A
–
TAN
BLK
A
B
C
D
E
F
G
H
J
K
WHT
TAN
WHT
RED
RED
A
B
C
D
E
F
G
H
J
K
2
3
(Sockets)
+
RED
4
RED
Motor
Vehicle Battery Cable, 4 Receptacle
Plow (End View)
BLK
RED
Pump –
D
C
B
A
BLK
RED
RED
BLK
RED
RED
BLK
BLK
1 RED
2 GRN
3 WHT
4 BLK
4-Pin Plug
(Under Dash)
CAUTION
B
1
2
3
4
On 2-plug electrical systems, plug covers shall
be used whenever snowplow is disconnected.
Cable is 12-volt unfused source.
To Switched Accessory Lead
RED
A BCD
A BCD
Blank
Connector
A
B
C
D
E
F
G
H
J
K
Port #1 Adapter
RED/GRN
C
BLK/ORN
Plow Module
7.5 Amp
Control
Fuse
15 Amp
Park/Turn
Fuse
Configuration
Plug or
Dust Cover
A A
B B
C C
C
B
A
HIGH
LOW
BEAM
HIGH-3C
COM-5B
LOW-1A
Driver-Side Plow Lamp
C
B
A
HIGH
LOW
BEAM
TURN
PARK
C
B
A
HIGH-4C
COM-11B
LOW-6A
PARK
TURN-8B
COM
Lit. No. 41298, Rev. 00
DS LOW BEAM IN
DS HIGH BEAM IN
2
1
Located at Front of Vehicle
LOW-1A
COM
HIGH-3C
HIGH-4C
COM-5B
LOW-6A
COM
TURN-8B
TURN-9B
PARK
COM-11B
Plow
Lighting
Harness,
11 Pin
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
BLK/WHT
BLK/ORN
WHT/YEL
WHT
BLU/ORN
BLK
BLK/ORN
GRY
PUR
BRN
LTBLU
Vehicle
Lighting
Harness,
11 Pin
For HB-3/HB-4
Headlamps:
To Vehicle
Headlamps,
Park/Turn, DRL
and Factory
Vehicle
Harnesses
DS HIGH BEAM OUT
DS LOW BEAM OUT
DRL SIGNAL IN
DS TURN IN
PARK LAMP IN
DS COMMON IN
DS COMMON OUT
PS LOW BEAM IN
PS HIGH BEAM IN
PS HIGH BEAM OUT
PS LOW BEAM OUT
PS TURN IN
PS COMMON IN
PS COMMON OUT
A
B
C
RED D
ORG E
PNK
F
PUR G
BRN H
LTBLU J
K
BLU
YEL
GRN
3
YEL
GRN
A
B
C
RED D
ORG E
F
PUR G
H
LTBLU J
K
BLU
4
For All
Headlamps
Except
HB-3/HB-4:
To Vehicle
Headlamps,
Park/Turn
and Factory
Vehicle
Harnesses
From Vehicle
Control
Harness
A
B
C
D
E
F
G
H
J
K
2
From Vehicle
Lighting
Harness
DS LOW BEAM IN
DS HIGH BEAM IN
DS HIGH BEAM NO.2 IN**
DS HIGH BEAM OUT
DS LOW BEAM OUT
DS LOW BEAM NO.2 OUT**
DS TURN IN
PARK LAMP IN
DS COMMON IN
DS COMMON OUT
YEL*
GRN
GRN
RED
ORG
WHT/YEL
PUR
BRN
BLU*
LTBLU
A
B
C
D
E
F
G
H
J
K
3
From DS
Vehicle
Headlamps
PS LOW BEAM IN
PS HIGH BEAM IN
PS HIGH BEAM NO.2 IN**
PS HIGH BEAM OUT
PS LOW BEAM OUT
PS LOW BEAM NO.2 OUT**
PS TURN IN
YEL*
GRN
WHT
RED
ORG
WHT/YEL
PUR
A
B
C
D
E
F
G
H
J
K
4
From PS
Vehicle
Headlamps
6
TURN-9B
COM
3 4 5
(Pins)
9 10 11
C
B
A
8
PARK
7
PARK
TURN
1
WHT
BLK
BLK/ORN
WHT/YEL
BLK/WHT
PUR
GRY
BRN
LTBLU
BLU/ORN
Plow (End View)
Passenger-Side Plow Lamp
A
B
C
D
E
RED/BLK
F
RED/WHT G
BLU
H
DKBLU/RED J
DKBLU/WHT K
RED
RED/YEL
PS COMMON IN
PS COMMON OUT
* HB-1(9004) A=BLUE, J=YELLOW)
** 99 DODGE RAM W/SPORT PACKAGE
BLU*
LTBLU
Isolation Module
May 1, 2010
38
LOW BEAM HEADLAMPS WITH SNOWPLOW CONNECTED TO VEHICLE (4-PORT MODULE)
Snowplow Assembly
BLK
–
Motor
Relay
BLK
S1
WHT
S2
GRN
S3
BLU
RED
RED
A
B
C
D
E
F
G
H
J
K
A
B
C
D
E
F
G
H
J
K
4
3
3
4
2
1
1
2
1 – Red
2 – Green
3 – White
4 – Black
Control
(connector face view)
Vehicle Control Harness, 4 Wire
D
C
B
A
4 Amp Fuse: S1, S2, S3
4 Amp Fuse: Motor Relay
BLK
RED
1 – Red (Control Power)
2 – Red (Twisted with #3)
3 – Black (Twisted with #2)
4 – Black (Control Ground)
+
Battery
RED
TAN
BLK
A
WHT
A
B
C
D
E
F
G
H
J
K
2
3
(Sockets)
1
TAN
WHT
RED
RED
A
B
C
D
E
F
G
H
J
K
4
+
RED
RED
RED
Pump –
Motor
Vehicle Battery Cable, 4 Receptacle
Plow (End View)
BLK
D
C
B
A
BLK
RED
RED
BLK
RED
RED
BLK
BLK
1 RED
2 GRN
3 WHT
4 BLK
4-Pin Plug
(Under Dash)
CAUTION
B
1
2
3
4
On 2-plug electrical systems, plug covers shall
be used whenever snowplow is disconnected.
Cable is 12-volt unfused source.
To Switched Accessory Lead
RED
A BCD
A BCD
A
B
C
D
E
F
G
H
J
K
Port #1 Adapter
RED/GRN
C
BLK/ORN
Plow Module
7.5 Amp
Control
Fuse
15 Amp
Park/Turn
Fuse
Configuration
Plug or
Dust Cover
A A
B B
C C
HIGH-3C
COM-5B
LOW-1A
Driver-Side Plow Lamp
C
B
A
HIGH
LOW
BEAM
TURN
PARK
C
B
A
HIGH-4C
COM-11B
LOW-6A
PARK
TURN-8B
COM
Lit. No. 41298, Rev. 00
3 4 5
(Pins)
9 10 11
2
1
Located at Front of Vehicle
LOW-1A
COM
HIGH-3C
HIGH-4C
COM-5B
LOW-6A
COM
TURN-8B
TURN-9B
PARK
COM-11B
Plow
Lighting
Harness,
11 Pin
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
BLK/WHT
BLK/ORN
WHT/YEL
WHT
BLU/ORN
BLK
BLK/ORN
GRY
PUR
BRN
LTBLU
Vehicle
Lighting
Harness,
11 Pin
For HB-3/HB-4
Headlamps:
To Vehicle
Headlamps,
Park/Turn, DRL
and Factory
Vehicle
Harnesses
DS HIGH BEAM OUT
DS LOW BEAM OUT
DRL SIGNAL IN
DS TURN IN
PARK LAMP IN
DS COMMON IN
DS COMMON OUT
PS LOW BEAM IN
PS HIGH BEAM IN
PS HIGH BEAM OUT
PS LOW BEAM OUT
PS TURN IN
PS COMMON IN
PS COMMON OUT
A
B
C
RED D
ORG E
PNK
F
PUR G
BRN H
LTBLU J
K
BLU
YEL
GRN
3
YEL
GRN
A
B
C
RED D
ORG E
F
PUR G
H
LTBLU J
K
BLU
4
For All
Headlamps
Except
HB-3/HB-4:
To Vehicle
Headlamps,
Park/Turn
and Factory
Vehicle
Harnesses
From Vehicle
Control
Harness
A
B
C
D
E
F
G
H
J
K
2
From Vehicle
Lighting
Harness
DS LOW BEAM IN
DS HIGH BEAM IN
DS HIGH BEAM NO.2 IN**
DS HIGH BEAM OUT
DS LOW BEAM OUT
DS LOW BEAM NO.2 OUT **
DS TURN IN
PARK LAMP IN
DS COMMON IN
DS COMMON OUT
YEL*
GRN
GRN
RED
ORG
WHT/YEL
PUR
BRN
BLU*
LTBLU
A
B
C
D
E
F
G
H
J
K
3
From DS
Vehicle
Headlamps
PS LOW BEAM IN
PS HIGH BEAM IN
PS HIGH BEAM NO.2 IN**
PS HIGH BEAM OUT
PS LOW BEAM OUT
PS LOW BEAM NO.2 OUT **
PS TURN IN
YEL*
GRN
WHT
RED
ORG
WHT/YEL
PUR
A
B
C
D
E
F
G
H
J
K
4
From PS
Vehicle
Headlamps
6
C
B
A
HIGH
LOW
BEAM
DS LOW BEAM IN
DS HIGH BEAM IN
8
TURN-9B
COM
7
PARK
C
B
A
PARK
TURN
1
WHT
BLK
BLK/ORN
WHT/YEL
BLK/WHT
PUR
GRY
BRN
LTBLU
BLU/ORN
Plow (End View)
Passenger-Side Plow Lamp
A
B
C
D
E
RED/BLK
F
RED/WHT G
BLU
H
DKBLU/RED J
DKBLU/WHT K
RED
RED/YEL
PS COMMON IN
PS COMMON OUT
* HB-1(9004) A=BLUE, J=YELLOW)
** 99 DODGE RAM W/SPORT PACKAGE
BLU*
LTBLU
Isolation Module
May 1, 2010
39
HIGH BEAM HEADLAMPS WITH SNOWPLOW CONNECTED TO VEHICLE (4-PORT MODULE)
Snowplow Assembly
BLK
–
Motor
Relay
BLK
S1
WHT
S2
GRN
S3
BLU
RED
RED
A
B
C
D
E
F
G
H
J
K
A
B
C
D
E
F
G
H
J
K
4
3
3
4
2
1
1
2
1 – Red
2 – Green
3 – White
4 – Black
Control
(connector face view)
Vehicle Control Harness, 4 Wire
D
C
B
A
4 Amp Fuse: S1, S2, S3
4 Amp Fuse: Motor Relay
BLK
RED
1 – Red (Control Power)
2 – Red (Twisted with #3)
3 – Black (Twisted with #2)
4 – Black (Control Ground)
+
Battery
RED
TAN
BLK
A
WHT
A
B
C
D
E
F
G
H
J
K
2
3
(Sockets)
1
TAN
WHT
RED
RED
A
B
C
D
E
F
G
H
J
K
4
+
RED
RED
RED
Pump –
Motor
Vehicle Battery Cable, 4 Receptacle
Plow (End View)
BLK
D
C
B
A
BLK
RED
RED
BLK
RED
RED
BLK
BLK
1 RED
2 GRN
3 WHT
4 BLK
4-Pin Plug
(Under Dash)
CAUTION
B
1
2
3
4
On 2-plug electrical systems, plug covers shall
be used whenever snowplow is disconnected.
Cable is 12-volt unfused source.
To Switched Accessory Lead
RED
A BCD
A BCD
A
B
C
D
E
F
G
H
J
K
Port #1 Adapter
RED/GRN
C
BLK/ORN
Plow Module
7.5 Amp
Control
Fuse
15 Amp
Park/Turn
Fuse
Configuration
Plug or
Dust Cover
A A
B B
C C
HIGH-3C
COM-5B
LOW-1A
Driver-Side Plow Lamp
C
B
A
HIGH
LOW
BEAM
TURN
PARK
C
B
A
HIGH-4C
COM-11B
LOW-6A
PARK
TURN-8B
COM
Lit. No. 41298, Rev. 00
3 4 5
(Pins)
9 10 11
2
Located at Front of Vehicle
LOW-1A
COM
HIGH-3C
HIGH-4C
COM-5B
LOW-6A
COM
TURN-8B
TURN-9B
PARK
COM-11B
Plow
Lighting
Harness,
11 Pin
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
BLK/WHT
BLK/ORN
WHT/YEL
WHT
BLU/ORN
BLK
BLK/ORN
GRY
PUR
BRN
LTBLU
Vehicle
Lighting
Harness,
11 Pin
For HB-3/HB-4
Headlamps:
To Vehicle
Headlamps,
Park/Turn, DRL
and Factory
Vehicle
Harnesses
DS HIGH BEAM OUT
DS LOW BEAM OUT
DRL SIGNAL IN
DS TURN IN
PARK LAMP IN
DS COMMON IN
DS COMMON OUT
PS LOW BEAM IN
PS HIGH BEAM IN
PS HIGH BEAM OUT
PS LOW BEAM OUT
PS TURN IN
PS COMMON IN
PS COMMON OUT
A
B
C
RED D
ORG E
PNK
F
PUR G
BRN H
LTBLU J
K
BLU
YEL
GRN
3
YEL
GRN
A
B
C
RED D
ORG E
F
PUR G
H
LTBLU J
K
BLU
4
For All
Headlamps
Except
HB-3/HB-4:
To Vehicle
Headlamps,
Park/Turn
and Factory
Vehicle
Harnesses
From Vehicle
Control
Harness
A
B
C
D
E
F
G
H
J
K
2
From Vehicle
Lighting
Harness
DS LOW BEAM IN
DS HIGH BEAM IN
DS HIGH BEAM NO.2 IN**
DS HIGH BEAM OUT
DS LOW BEAM OUT
DS LOW BEAM NO.2 OUT**
DS TURN IN
PARK LAMP IN
DS COMMON IN
DS COMMON OUT
YEL*
GRN
GRN
RED
ORG
WHT/YEL
PUR
BRN
BLU*
LTBLU
A
B
C
D
E
F
G
H
J
K
3
From DS
Vehicle
Headlamps
PS LOW BEAM IN
PS HIGH BEAM IN
PS HIGH BEAM NO.2 IN**
PS HIGH BEAM OUT
PS LOW BEAM OUT
PS LOW BEAM NO.2 OUT**
PS TURN IN
YEL*
GRN
WHT
RED
ORG
WHT/YEL
PUR
A
B
C
D
E
F
G
H
J
K
4
From PS
Vehicle
Headlamps
6
C
B
A
HIGH
LOW
BEAM
DS LOW BEAM IN
DS HIGH BEAM IN
1
TURN-9B
COM
8
PARK
C
B
A
7
PARK
TURN
1
WHT
BLK
BLK/ORN
WHT/YEL
BLK/WHT
PUR
GRY
BRN
LTBLU
BLU/ORN
Plow (End View)
Passenger-Side Plow Lamp
A
B
C
D
E
RED/BLK
F
RED/WHT G
BLU
H
DKBLU/RED J
DKBLU/WHT K
RED
RED/YEL
PS COMMON IN
PS COMMON OUT
* HB-1(9004) A=BLUE, J=YELLOW)
** 99 DODGE RAM W/SPORT PACKAGE
BLU*
LTBLU
Isolation Module
May 1, 2010
40
HYDRAULIC SCHEMATIC
ANGLE RIGHT
ANGLE LEFT
LIFT
Raise
Lower
Quill
Angle
Relief
Scrape
Lock
Angle
Relief
S1
41
S2
S3
Pump Relief
Pump
Filter
Return to Reservoir
Lit. No. 41298, Rev. 00
Draws Fluid
on Lower
May 1, 2010
RAISE – ELECTRICAL
System Response
–
BLK
Pump
Motor
1.
A
RED
RED
+
RED
Motor
Relay
A
B
TAN C
WHT D
E
RED
F
G
H
J
K
BLK
A
B
C
D
E
F
G
H
J
K
12V
COM
4 Amp Fuse: S1, S2, S3
BLK
4 Amp Fuse: Motor
Relay
RED
S1
WHT
GRN
S3
BLU
RED
RED
A
B
C
D
E
F
G
H
J
K
A
B
C
D
E
F
G
H
J
K
12V
S3
S2
S1
M/R
Plow Module
S2
B
12V
By activating the RAISE function
on the cab control, the control
sends a signal to the Plow
Module to complete the ground
path for the electrical circuit,
activating the motor relay and
solenoid cartridge valve S3.
2. Hydraulic fluid from the pump
flows through the activated S3
and unactivated S2, through
the internal check valve in S1,
into the rod end of the lift ram,
causing it to retract. At the same
time, hydraulic fluid is being
forced out of the base of the ram,
through the scrape lock (RV4)
relief valve and returned to the
reservoir.
NOTE: Battery voltage is supplied
to the plow module, the motor
relay and the 3 solenoid coils
when the snowplow is connected
to the vehicle.
C
Wire Side View
10-Pin Connector
A
B
C
D
E
Lit. No. 41298, Rev. 00
K
J
H
G
F
May 1, 2010
42
RAISE – HYDRAULIC
ANGLE RIGHT
ANGLE LEFT
LIFT
Raise
Lower
Quill
Angle
Relief
Scrape
Lock
Angle
Relief
S1
Pressure
43
Return
S2
Pilot Line
S3
Pump Relief
Pump
Filter
Return to Reservoir
Lit. No. 41298, Rev. 00
Draws Fluid
on Lower
May 1, 2010
LOWER / FLOAT – ELECTRICAL
System Response
–
BLK
Pump
Motor
1.
A
RED
RED
+
RED
Motor
Relay
A
B
TAN C
WHT D
E
RED
F
G
H
J
K
BLK
A
B
C
D
E
F
G
H
J
K
12V
COM
4 Amp Fuse: S1, S2, S3
BLK
4 Amp Fuse: Motor
Relay
RED
S1
WHT
GRN
S3
BLU
RED
A
B
C
D
E
F
G
H
J
K
A
B
C
D
E
F
G
H
J
K
12V
S3
S2
S1
M/R
Plow Module
S2
B
RED
12V
By activating the LOWER
function on the cab control, the
control sends a signal to the
Plow Module to complete the
ground path for the electrical
circuit, activating solenoid
cartridge valve S1.
2. With the weight of the snowplow
on the rod end of the lift ram and
S1 cartridge valve shifted, the
lift ram extends. Hydraulic fluid
is pushed out of the rod end,
through activated S1, unactivated
S2 and S3, and back to the
reservoir. At the same time,
hydraulic fluid is being drawn
through CV2 into the base end of
the ram from the reservoir.
NOTE: When activating Float
mode, the S1 cartridge stays
open until the Raise function is
activated
NOTE: Battery voltage is supplied
to the plow module, the motor
relay and the 3 solenoid coils
when the snowplow is connected
to the vehicle.
C
Wire Side View
10-Pin Connector
A
B
C
D
E
Lit. No. 41298, Rev. 00
K
J
H
G
F
May 1, 2010
44
LOWER – HYDRAULIC
ANGLE RIGHT
ANGLE LEFT
LIFT
Raise
Lower
Quill
Angle
Relief
Scrape
Lock
Angle
Relief
S1
Drawn from
Tank
45
Return
S2
Pilot Line
S3
Pump Relief
Pump
Filter
Return to Reservoir
Lit. No. 41298, Rev. 00
Draws Fluid
on Lower
May 1, 2010
ANGLE RIGHT – ELECTRICAL
System Response
–
BLK
Pump
Motor
1.
A
RED
RED
+
RED
Motor
Relay
A
B
TAN C
WHT D
E
RED
F
G
H
J
K
BLK
A
B
C
D
E
F
G
H
J
K
12V
COM
4 Amp Fuse: S1, S2, S3
BLK
S1
WHT
GRN
S3
BLU
RED
A
B
C
D
E
F
G
H
J
K
A
B
C
D
E
F
G
H
J
K
12V
S3
S2
S1
M/R
Plow Module
S2
B
RED
NOTE: Battery voltage is supplied
to the plow module, the motor
relay and the 3 solenoid coils
when the snowplow is connected
to the vehicle.
2. Hydraulic fluid from the pump
flows through unactivated S3,
through PC1, into the base of the
DS ram, causing it to extend.
4 Amp Fuse: Motor
Relay
RED
By activating the angle right (R
on the control face) function on
the cab control, the control sends
a signal to the Plow Module to
complete the ground path for
the electrical circuit, activating
the motor relay and solenoid
cartridge valve S2.
3. The retracting PS ram pushes
the hydraulic fluid out of its base
end through the activated S2
cartridge and unactivated S3,
back to the reservoir.
12V
46
C
Wire Side View
10-Pin Connector
A
B
C
D
E
Lit. No. 41298, Rev. 00
K
J
H
G
F
May 1, 2010
ANGLE RIGHT – HYDRAULIC
ANGLE RIGHT
ANGLE LEFT
LIFT
DS
PS
Raise
Lower
Quill
Angle
Relief
Scrape
Lock
Angle
Relief
S1
47
Pressure
Return
S2
Pilot Line
S3
Pump Relief
Pump
Filter
Return to Reservoir
Lit. No. 41298, Rev. 00
Draws Fluid
on Lower
May 1, 2010
ANGLE LEFT – ELECTRICAL
System Response
–
BLK
Pump
Motor
1.
A
RED
RED
+
RED
Motor
Relay
A
B
TAN C
WHT D
E
RED
F
G
H
J
K
BLK
A
B
C
D
E
F
G
H
J
K
12V
COM
4 Amp Fuse: S1, S2, S3
BLK
S1
WHT
GRN
S3
BLU
B
RED
RED
A
B
C
D
E
F
G
H
J
K
A
B
C
D
E
F
G
H
J
K
12V
S3
S2
S1
M/R
4. The retracting DS ram pushes
the hydraulic fluid out of its base
end through the open P/O check
valve, through activated S3, and
back to the reservoir.
NOTE: Battery voltage is supplied
to the plow module, the motor
relay and the 3 solenoid coils
when the snowplow is connected
to the vehicle.
Plow Module
S2
2. Hydraulic fluid from the pump
flows through activated S3 and
S2 and into the base end of the
PS ram, causing it to extend.
4 Amp Fuse: Motor
Relay
RED
By activating the angle left (L on
the control face) function on the
cab control, the control sends
a signal to the Plow Module to
complete the ground path for
the electrical circuit, activating
the motor relay and solenoid
cartridge valves S2 and S3.
3. Pressure within the hydraulic
circuit causes the P/O check
valve (PC1) to open.
12V
48
C
Wire Side View
10-Pin Connector
A
B
C
D
E
Lit. No. 41298, Rev. 00
K
J
H
G
F
May 1, 2010
ANGLE LEFT – HYDRAULIC
ANGLE RIGHT
ANGLE LEFT
LIFT
DS
PS
Raise
Lower
Quill
Angle
Relief
Scrape
Lock
Angle
Relief
S1
49
Pressure
Return
S2
Pilot Line
S3
Pump Relief
Pump
Filter
Return to Reservoir
Lit. No. 41298, Rev. 00
Draws Fluid
on Lower
May 1, 2010
HOLD IN RAISE POSITION – HYDRAULIC
Control: None
ANGLE RIGHT
ANGLE LEFT
LIFT
System Response
Raise
1.
Hydraulic fluid is trapped in the
rod end of the lift ram by the
internal check valve in solenoid
cartridge valves S1.
Lower
Quill
Angle
Relief
Scrape
Lock
Angle
Relief
S1
Pressure
50
S2
S3
Pump Relief
Pump
Filter
Return to Reservoir
Lit. No. 41298, Rev. 00
Draws Fluid
on Lower
May 1, 2010
STRIKING AN OBJECT WHILE PLOWING
Blade Movement: Striking an
Object While Plowing
Control: None
Force applied
when pushing
Force applied
when backdragging
ANGLE RIGHT
ANGLE LEFT
LIFT
System Response:
1.
Raise
Hydraulic fluid is trapped in the
base end of the cylinders by the
relief valves, the P/O check valve
(PC1) and solenoid cartridge
valve S2.
Lower
Quill
Angle
Relief
2. When the snowplow contacts an
object, the force of the impact
increases the hydraulic pressure
in the base end of the cylinder.
When the pressure exceeds the
relief valve pressure setting, the
relief valve opens allowing oil to
flow to the base of the opposite
cylinder.
Scrape
Lock
Angle
Relief
51
S1
DS
S2
S3
Pump Relief
Pump
Filter
Return to Reservoir
Lit. No. 41298, Rev. 00
Draws Fluid
on Lower
May 1, 2010
STRIKING AN OBJECT WHILE PLOWING
Blade Movement: Striking an
Object While Plowing
Force applied
when pushing
Force applied
when backdragging
ANGLE RIGHT
ANGLE LEFT
LIFT
Control: None
System Response:
1.
Raise
Hydraulic fluid is trapped in the
base end of the cylinders by the
relief valves, the P/O check valve
(PC1) and solenoid cartridge
valve S2.
Lower
Quill
Angle
Relief
PS
2. When the snowplow contacts an
object, the force of the impact
increases the hydraulic pressure
in the base end of the cylinder.
When the pressure exceeds the
relief valve pressure setting, the
relief valve opens allowing oil to
flow to the base of the opposite
cylinder.
Scrape
Lock
Angle
Relief
52
Pump Relief
Pump
Filter
Return to Reservoir
Lit. No. 41298, Rev. 00
Draws Fluid
on Lower
May 1, 2010
SCRAPE LOCK OPEN (ALLOWS BLADE TO RAISE, FOLLOWING SURFACE CONTOUR)
ANGLE RIGHT
ANGLE LEFT
LIFT
Raise
Lower
Quill
Angle
Relief
Scrape
Lock
Angle
Relief
S1
53
Drawn from
Reservoir
Return to
Reservoir
S2
S3
Pump Relief
Pump
Filter
Return to Reservoir
Lit. No. 41298, Rev. 00
Draws Fluid
on Lower
May 1, 2010
TROUBLESHOOTING GUIDE – TABLE OF CONTENTS
INTRODUCTION .............................................................................................55
SOLENOID COIL ACTIVATION TEST (SCAT) ............................................. 61
HOW TO USE THE TROUBLESHOOTING GUIDE .......................................55
INDIVIDUAL SOLENOID COIL TEST ........................................................... 63
ELECTRICAL TESTING .................................................................................55
CONTROL/CABLE/SNOWPLOW MODULE TEST ...................................... 64
BEFORE YOU BEGIN ....................................................................................56
MOTOR AND MOTOR RELAY TEST............................................................ 65
HEADLAMP TROUBLESHOOTING ..............................................................57
PUMP PRESSURE TEST .............................................................................. 66
Vehicle Headlamps ............................................................................. 57
BLADE DROP SPEED ADJUSTMENT ........................................................ 67
Snowplow Headlamps ....................................................................... 58
SCRAPE LOCK ADJUSTMENT ................................................................... 68
Snowplow Park/Turn Lamps ............................................................. 59
PILOT-OPERATED (POPPET STYLE) CHECK VALVE INSPECTION ....... 69
Snowplow DRL Lamps ....................................................................... 60
RELIEF VALVE INSPECTION AND ADJUSTMENT .................................... 70
54
Lit. No. 41298, Rev. 00
May 1, 2010
TROUBLESHOOTING GUIDE
INTRODUCTION
HOW TO USE THE TROUBLESHOOTING GUIDE
All malfunctions of the HT Series™
snowplow can be categorized as
structural, electrical or hydraulic.
Structural issues are generally
related to the blade, A-frame,
headgear and mount components
and are usually identified by visual
inspection. However, electrical and
hydraulic issues can be difficult to
trace.
Because of the relative complexity of
the snowplow electrical and hydraulic
systems, some conditions must be
eliminated in order to develop valid
tests.
Read and understand the Theory
of Operation before attempting
troubleshooting.
If the listed conditions are not
met, the procedure can result in
inaccurate results and wasted time.
In many cases, satisfying the listed
conditions alone solves the problem.
1.
Go to the Before You Begin
section (next page), and satisfy
the listed conditions. These
conditions must be met before
proceeding to any of the tables
and tests that follow.
2. If a lighting problem exists,
proceed to the proper Headlamp
Troubleshooting tables for a
list of basic test questions and
solutions to common problems.
Lit. No. 41298, Rev. 00
3. If still having problems or the
problem is not related to the
headlamps, go to the Hydraulic
System Testing Section.
4. Follow along sequentially through
the tables and tests, referring
to the Hydraulic & Electrical
Schematics and System
Overview sections as needed.
Eventually the problem can be
identified at the component level.
ELECTRICAL TESTING
Read and understand the electrical
circuit operation information in the
Theory of Operation section. A
simple 12-volt (12V) test light with
a ground lead or volt meter can be
used for circuit testing in most cases.
The exception is the paired multiplex
wiring, which carries a low level
signal from the control to the plow
module.
When directed to check for 12V,
ground the test lamp lead or volt
meter and probe the terminal. When
asked to check for ground, attach the
test lamp lead to +12V and probe the
terminal.
NOTE: 12V is a nominal value. If
using a voltmeter, actual voltage
will vary with the vehicle and
presence of loads in tested
circuits. Continuity alone does
not guarantee a good circuit. Poor
connectors or damaged wires may
have continuity but be unable to
carry sufficient current.
May 1, 2010
55
TROUBLESHOOTING GUIDE
BEFORE YOU BEGIN
Before proceeding, or performing any tests, you must verify the following conditions:
1. Verify the customer has
accurately and completely
described the problem. Check all
lighting and snowplow functions.
c.
2. Check the obvious:
a. Snowplow is attached to
vehicle and all harnesses are
connected.
b. Ignition is turned on or
engine is running if operating
control from within the cab.
d. Fuses are good.
e. Vehicle battery and charging
system are in good condition
and battery connections are
clean and tight.
f.
Lit. No. 41298, Rev. 00
The control is connected in
the cab and turned on. Verify
that the control power LED
is in a steady state and is
not flashing. Verify that the
snowplow anti-theft system
is unlocked.
Harness connector pins
and terminals are free of
corrosion, ensuring good
connections, and coated with
dielectric grease.
CAUTION
Fill the reservoir to within
1" from the top of the fill hole.
Do not overfill. Overfilling
could damage the unit.
CAUTION
Do not mix different types of
hydraulic fluid. Some fluids
are not compatible and may
cause performance problems
and product damage.
g. Hydraulic reservoir is
filled to proper level with
recommended fluid when
snowplow is in the lowered
position and lift ram is fully
retracted. See Product
Specifications.
h. There are no fluid leaks from
hoses, fittings, rams or the
hydraulic unit.
i.
Hoses are routed correctly.
j.
Coil wire connections are
secure and correct.
k.
Correct cartridges are
installed in the proper
locations. This step may be
better left until the results of
the SCAT test are known,
unless hydraulic repair or
cartridge replacement took
place recently.
May 1, 2010
56
TROUBLESHOOTING GUIDE
VEHICLE HEADLAMPS
Incorrect Operation or No Headlamps
1
2
3
4
5
6
7
8
9
10
11
12
13
14
BASIC CHECK QUESTIONS
SOLUTIONS
DRL mode/automatic headlamp function
Correct Isolation Module kit installed for application
OEM lights operating correctly prior to installation
OEM fuse tests good
OEM headlamp bulb operational
Plugged into OEM headlamp correctly
Harnesses in correct location at Isolation Module and installed per
installation instructions
Harnesses configured correctly for HB-1/HB-5 and/or kits using adapters
Configuration plug correct
(only required on certain 4-Port Module installations)
Correct harnesses and/or Isolation Module in kit
Harness wired per drawing
Verify power and ground in proper pin locations at Isolation Module
Verify power and ground in proper pin locations to vehicle headlamp
Test Isolation Module with Isolation Module tester
Fully understand OEM headlamp operation; refer to vehicle owner's manual.
Verify per eMatch at www.fisherplows.com.
OEM headlamps must be fully operational for correct Isolation Module operation.
Replace with proper fuse.
Replace with proper bulb.
Connect per Isolation Module instructions.
Lit. No. 41298, Rev. 00
Install using Isolation Module instructions.
Install using Isolation Module instructions.
Refer to Isolation Module instructions.
57
Refer to Isolation Module parts list.
See electrical schematics in this guide.
See electrical schematics in this guide.
See electrical schematics in this guide.
Test using instructions supplied with tester.
May 1, 2010
TROUBLESHOOTING GUIDE
SNOWPLOW HEADLAMPS
Incorrect Operation or No Headlamps
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
BASIC CHECK QUESTIONS
SOLUTIONS
DRL mode/automatic headlamp function correctly
Harnesses connected between vehicle and snowplow (all)
Harness connectors clean / not corroded
Ignition on
Control powers up with key on
Correct Isolation Module kit installed for application
OEM lights operating correctly prior to installation
OEM fuse tests good
Bulb burned out
Plugged into OEM headlamp correctly
Harnesses in correct location at Isolation Module and installed per
installation instructions
Harnesses configured correctly for HB-1/HB-5 and/or kits using adapters
Configuration plug correct
(only required on 4-Port Module)
Correct harnesses and/or Isolation Module
Harness wired per drawing
Verify power and ground in proper pin locations at Isolation Module
Verify power and ground in proper pin locations to vehicle headlamp
Isolation Module operating correctly
Fully understand OEM headlamp operation; refer to vehicle owner's manual.
Harnesses must be connected for all snowplow and headlamp functions.
Replace as needed.
Ignition switch or vehicle park lights must be "ON" for snowplow headlamps to operate.
Go to Control/Cable/Plow Module Test.
Verify per eMatch at www.fisherplows.com.
OEM headlamps must be fully operational for correct Isolation Module operation.
Replace with proper fuse.
Replace with proper bulb.
Connect per Isolation Module instructions.
Lit. No. 41298, Rev. 00
58
Install using Isolation Module instructions.
Install using Isolation Module instructions.
Refer to Isolation Module instructions.
Refer to Isolation Module parts list.
See electrical schematics in this guide.
See electrical schematics in this guide.
See electrical schematics in this guide.
Test using instructions supplied with tester.
May 1, 2010
TROUBLESHOOTING GUIDE
SNOWPLOW PARK/TURN LAMPS*
Incorrect Operation or No Park/Turn Lamps
1
2
3
4
5
6
7
8
9
10
11
12
13
BASIC CHECK QUESTIONS
SOLUTIONS
OEM park/turn lamps working
Harnesses connected between vehicle and snowplow (all)
Clean harness connectors
Ignition on
Control powers up with key on
15-amp park/turn fuse good in #1 harness
Black/orange "ground" wire connected to motor ground stud **
Spliced into OEM park/turn circuit correctly
Harnesses in correct location at Isolation Module and installed per
installation instructions
Harness wired per drawing
Verify power and ground in proper pin locations at Isolation Module
Verify power and ground in proper pin locations to vehicle headlamp
Bulb good
Refer to vehicle owner's manual for fuse location and size.
Harnesses must be connected for all snowplow and headlamp functions.
Replace as needed.
Ignition must be "ON" for snowplow headlamps to operate.
Go to Control/Cable/Plow Module Test.
Replace with proper fuse.
Refer to Isolation Module instructions.
Refer to Isolation Module instructions.
Install using Isolation Module instructions.
See electrical schematics in this guide.
See electrical schematics in this guide.
See electrical schematics in this guide.
Replace with proper bulb.
59
* Some applications may use the turn circuit for DRLs.
** Not applicable to INTENSIFIRE™ headlamps.
Lit. No. 41298, Rev. 00
May 1, 2010
TROUBLESHOOTING GUIDE
SNOWPLOW DRL LAMPS*
Incorrect Operation or No DRL Lamps
1
2
3
4
5
6
7
8
9
10
11
12
BASIC CHECK QUESTIONS
SOLUTIONS
Fully understand OEM DRL operation
OEM headlamps and DRLs operating correctly
OEM DRL fuse tests good
Harnesses connected between vehicle and snowplow (all)
Corrosion at harness connectors
Ignition on
Does control power up with key on
Snowplow headlamp and park/turn lamps all working correctly
Correct Isolation Module kit installed for application
Isolation Module and harnesses correctly installed per instructions
Harness wired per drawing
Bulb burned out
Refer to vehicle owner's manual for DRL operation.
OEM headlamps must be fully operational for correct Isolation Module operation.
Refer to vehicle owner's manual for fuse location and size.
Harnesses must be connected for all snowplow and headlamp functions.
Replace as needed.
Ignition must be "ON" for snowplow DRL operation.
Go to Control/Cable/Plow Module Test.
See electrical schematics in this guide.
Verify per eMatch at www.fisherplows.com.
Refer to Isolation Module instructions.
See electrical schematics in this guide.
Replace with proper bulb.
60
* Snowplow DRLs operate as a series circuit and will illuminate bulb at 1/2 intensity. In some applications, the OEM DRLs will stay illuminated with snowplow attached.
Lit. No. 41298, Rev. 00
May 1, 2010
TROUBLESHOOTING GUIDE
SOLENOID COIL ACTIVATION TEST (SCAT)
NOTE: See the System
Overview – Controls section for
details on control time outs and
wing functions.
The main purpose of the SCAT test is
to narrow down a problem as either
being electrical or hydraulic. Follow
the steps below to diagnose the
problem, then go to the appropriate
test as directed.
1.
Verify that harness B is properly
attached to the solenoid coils.
Refer to the labels on the
hydraulic unit and the electrical
schematics in this guide for
details.
2. Install the Diagnostic Harness
(PN 29290 or PN 29290-1)
according to the instructions on
the following pages.
3. When instructed to do so, perform
the SCAT test by activating
the control for each function
and checking for magnetic pull
at all three solenoid coils. A
solenoid coil is magnetized if
a screwdriver held nearby is
attracted.
Lit. No. 41298, Rev. 00
4. Compare the SCAT test results
with the testing charts on the
following pages.
If the motor relay LED is not
activating when it should, go to
the Motor and Motor Relay Test.
Harness B Solenoid Coil Connections
Lift Ram
Rod End
Lift Ram
Base End
PS Angle Ram
DS Angle Ram
Solenoid Valve
Valve Type
Wire Color
Plow Function
If a coil(s) is not magnetizing
when it should be, you have an
electrical problem. Using a test
light, check the ground wires (not
red) attached to the improperly
acting coil(s) for switched ground
while activating the function that
should energize the coil(s). If
switched ground is not present,
go to the Control/Cable/Plow
Module Test. If switched ground
is present, go to the Individual
Solenoid Coil Test.
Raise
Lower/Float
Angle Right
Angle Left
Drop Speed
Adjustment
(CW = Slower)
S1
S2
S3
2-Way
White
& Red
3-Way
Green
& Red
4-Way
Blue
& Red
Active Coil
Active Port
S3
S1
S2
S2 & S3
Lift Ram, Rod End
Lift Ram, Rod End
DS Angle Ram
PS Angle Ram
Torque Specifications
All Solenoid/Check Valves:
All Solenoid Coil Nuts:
Motor Relay Terminals:
S1
S2
S3
Motor Terminals:
19–21 ft-lb
48–60 in-lb
Small 10–15 in-lb
Large 25–35 in-lb
25–35 in-lb
61
48615
5. If the motor relay and all coils
are working properly, you have
a hydraulic problem. Go to the
Hydraulic System Test.
May 1, 2010
TROUBLESHOOTING GUIDE
SOLENOID COIL ACTIVATION TEST (SCAT)
NOTE: This MUX-plow diagnostic
harness kit can be used with
or without the snowplow
connected to a vehicle. Follow the
appropriate instructions for each
testing situation.
2. Unplug the snowplow connectors
from Ports A and B of the Plow
Module.
Plow Module (on hydraulic unit)
6. Reconnect the snowplow and
vehicle battery cables.
WARNING
Lower blade when vehicle is
parked. Temperature changes
could change hydraulic
pressure, causing the
blade to drop unexpectedly
or damaging hydraulic
components. Failure to do
this could result in serious
personal injury.
On-Truck Testing
LED
Plug
29290-1
Diagnostic
Harness
4-Position
Control
Connector
Remove the vehicle ignition key and
put the vehicle in park or in gear
to prevent others from starting the
vehicle during testing.
1.
Disconnect the snowplow and
vehicle battery cables, then
remove the hydraulic unit covers.
3. Connect the diagnostic harness
connectors A and B to the
matching ports on the Plow
Module (A to A and B to B).
4. Plug the connectors removed
from the Plow Module into the
matching connectors on the
diagnostic harness (A to A and
B to B).
Lit. No. 41298, Rev. 00
5. Connect the snowplow control into
the 4-position control connector
either in the cab of the vehicle or
on the diagnostic harness.
NOTE: If you connect the control
inside the cab of the vehicle,
the engine does not need to be
running, but the vehicle ignition
key must be turned to the "ON"
position before proceeding. If
you connect the control to the
diagnostic harness, the key
should be left out of the ignition.
7.
Turn the snowplow control "ON"
and perform a SCAT test. See
the following chart for solenoid
numbers and functions. See
the beginning of this section for
instructions on performing a
SCAT test.
Solenoid Coil Activation
Test (SCAT) Chart
Control
Function
Component(s)
Activated
Raise
S3 Motor Relay
Lower
S1
Angle Right
S2, Motor Relay
Angle Left
S2, S3, Motor Relay
8. After completing the SCAT test,
turn the snowplow control and
the vehicle ignition "OFF", then
disconnect the snowplow and
vehicle battery cables.
9. Perform any required repairs and
retest as needed. Make sure to
disconnect the snowplow and
vehicle battery cables before
removing the diagnostic harness.
NOTE: The green LED on the
diagnostic harness will illuminate
when the motor relay function is
activated. This light only tests the
Plow Module's motor relay output.
Refer to Motor and Motor Relay
Test Section for instructions on
properly testing a motor relay.
May 1, 2010
62
TROUBLESHOOTING GUIDE
SOLENOID COIL ACTIVATION TEST (SCAT)
Off-Truck Testing
1.
4. Plug the connectors removed
from the Plow Module into the
matching connectors on the
diagnostic harness (A to A and
B to B).
Remove the hydraulic unit
covers.
2. Unplug the snowplow connectors
from Ports A and B of the Plow
Module.
Plow Module (on hydraulic unit)
LED
Plug
5. Connect the snowplow control
into the 4-position control
connector on the diagnostic
harness.
6. Connect a 12V power source
to the snowplow battery cable
(POSITIVE [+] 12V to the red
wire and NEGATIVE [–] to the
black wire). Turn on the power
source.
7.
29290-1
Diagnostic
Harness
4-Position
Control
Connector
3. Connect the diagnostic harness
connectors A and B to the
matching ports on the Plow
Module (A to A and B to B).
Lit. No. 41298, Rev. 00
Turn the snowplow control "ON"
and perform a Solenoid Coil
Activation Test (SCAT). See
the following chart for solenoid
numbers and functions. See
the beginning of this section for
instructions on performing a
SCAT test.
NOTE: The green LED on the
diagnostic harness will illuminate
when the motor relay function is
activated. This light only tests the
Plow Module's motor relay output.
Refer to Motor and Motor Relay
Test Section for instructions on
properly testing a motor relay.
INDIVIDUAL SOLENOID COIL
TEST
Solenoid Coil Activation
Test (SCAT) Chart
Control
Function
Component(s)
Activated
Raise
S3 Motor Relay
Lower
S1
Angle Right
S2, Motor Relay
Angle Left
S2, S3, Motor Relay
8. After completing the SCAT
test, turn the snowplow control
"OFF" and disconnect the power
source.
9. Perform any required repairs
and retest as needed. Make sure
to disconnect the power source
before removing the diagnostic
harness.
1.
Remove both wires from coil
terminals.
2. Attach an ohmmeter across the
coil terminals.
3. A reading that is not
approximately 7 ohm indicates
coil is damaged and must be
replaced.
4. Attach an ohmmeter to one coil
terminal and to the steel washer
at the end of the coil.
5. A reading that is not "open"
indicates that the coil has an
internal short and needs to be
replaced.
6. If both readings are OK
(i.e., approximately 7 ohm across
terminals and "open" between
terminal and washer), then the
coil is good.
NOTE: A good coil will draw
approximately 1.5 Amp.
May 1, 2010
63
TROUBLESHOOTING GUIDE
CONTROL/CABLE/PLOW MODULE TEST
CONDITION
POSSIBLE CAUSE
Snowplow is not connected
Incomplete harness connection(s) or
damaged harness(es)
Control power
light is not on.
Single-pin connector on vehicle plow
lighting harness is not connected.
Harnesses connected to Isolation
Module incorrectly.
Control fuse is blown.
CORRECTIVE ACTION
• Make sure grille plugs between snowplow and truck are properly connected.
• With the vehicle switched accessory on, test the 4-pin connector inside the cab. If pin 1 does not have 12V
and/or if pin 4 does not have ground, use the electrical schematic in this guide to trace the wires from the
connector back to their source. Look for incomplete connections or damaged wires. Complete connections or
repair/replace damaged wires and harnesses as needed.
• Make sure single-pin connector on vehicle plow lighting harness is properly connected.
• Using the electrical schematic in this guide, verify that Isolation Module and harnesses are properly
connected.
• Replace all blown fuses in under-hood electrical harnesses.
• Make sure all plugs (control, between the snowplow and truck, on the snowplow, etc.) are properly connected.
• Check continuity of twisted pair wiring between control connector and plow module connector.
• If all plugs are properly connected, install a properly working control. If problem is corrected, replace PC
board and/or coiled cord in damaged control.
• If problem is not corrected with properly working control, replace Plow Module.
Control power
light is blinking
(slow flash).
Poor Connection between control
and module, Damaged Control or
Damaged Plow Module
Control power
light is blinking
(fast).
Snowplow is locked
• Enter 4-digit security code to unlock snowplow.
Harnesses connected to Isolation
Module incorrectly.
• Using the electrical schematic in this guide, verify that Isolation Module harnesses are properly connected.
• Replace all blown fuses on truck and snowplow.
Control power
light is on, but
snowplow does
not respond.
Blown fuse or Damaged Plow Module • If fuses are all okay, check for 12V at all coils and primary terminal of motor relay. If 12V is missing from any coil or
relay, replace Plow Module. If 12V is present, go to next Possible Cause.
Damaged harness(es) or cable(s)
Damaged control or Plow Module
• Perform a Solenoid Coil Activation Test (SCAT) according to the instructions in this guide. Replace/repair any
damaged harnesses and cables.
• Install a properly working control. If problem is corrected, replace PC board and/or coiled cord in damaged
control.
• If problem is not corrected with properly working control, replace Plow Module.
To Safely Handle PCB:
CAUTION
Circuit board may be
damaged by static electricity.
Always touch ground before
handling PC board.
Lit. No. 41298, Rev. 00
Before disassembling control and
touching the PC board, be sure
to remove any static charge from
yourself. Static charge can build
up as a technician works on the
control. Best practice is to work at a
properly grounded work station with
a grounded wrist strap attached to
the technician. In place of proper
work station, the technician should
work in an oil and solvent free area
and touch a good ground each time
before touching the PC board while
servicing the unit.
Handle the PC board by the edges
only.
Do not touch the carbon (black)
areas of the keypad. Your skin oils
will deteriorate the contact area.
May 1, 2010
64
TROUBLESHOOTING GUIDE
MOTOR AND MOTOR RELAY TEST
WARNING
Keep 8' clear of the blade when
it is being raised, lowered or
angled. Do not stand between
the vehicle and blade or
directly in front of the blade. If
the blade hits or drops on you,
you could be seriously injured.
3. Check for 12V at the small
terminal of the motor relay with the
red wire attached to it. If 12V is not
present, recheck the coil fuse F2
in harness B. If the fuse is good,
check the red wire in harness B.
Replace/repair either the wire or
the harness as needed.
8" Red Cable
Perform this test if the control lights
up and/or turns on, but the motor
does not run.
1.
Check the motor relay fuse on
harnesses B. Replace if fuse is
blown, then retest snowplow.
2. Remove the coil fuse F1 in
harness B. Remove the 8" red
battery cable from the large
terminal of the motor relay and
isolate it. Removing the fuses
and isolating the battery cable
will eliminate the potential of
accidental blade movement
during testing.
4. If 12V is present at the small
relay terminal with the red wire,
turn the control ON, then check
for switched ground on the small
terminal with the black wire
attached to it while activating any
function except lower. If switched
ground is not present, check the
Red
Red Wire from
"B" Harness
Black Wire from
"B" Harness
Black
Module
black wire in harness B of the
plow module. Replace/repair
either the wire or the harness as
needed.
5. Check for switched 12V at the
empty large motor relay terminal
while activating any control
function except lower. The empty
terminal is the terminal that
would normally contain the 8" red
battery cable. If switched 12V is
not present, replace the motor
relay.
6. If switched 12V is present at the
empty large motor relay terminal,
replace the motor.
7.
Once repair/testing is completed,
reinstall fuses and 8" red battery
cable, then retest snowplow.
Fuse
4 Amp
S1 S2 S3
Red Wire Daisy
Chain from "B"
Blank
Harness to
Connector
White from
S1, S2, S3
"B" Harness
"B" Harness Blue from
"B" Harness "A" Harness
to S1
from Plow Cable
to S3
Green from
"B" Harness to S2
* See wire stamping for fuse identification.
Lit. No. 41298, Rev. 00
May 1, 2010
65
TROUBLESHOOTING GUIDE
PUMP PRESSURE TEST
WARNING
Keep 8' clear of the blade when
it is being raised, lowered or
angled. Do not stand between
the vehicle and blade or
directly in front of the blade. If
the blade hits or drops on you,
you could be seriously injured.
NOTE: Reservoir will contain
residual pressure. Slowly remove,
then reinstall, breather to release
pressure before proceeding.
1.
3. Attach a 3000 psi hydraulic
pressure gauge to the PS ram by
teeing into the line.
CONDITION
4. Activate the left angle function
until blade is fully angled.
NOTE: Control will time out after
9.6 seconds. Repeat command if
blade is not fully angled.
5. Repeat the left angle function,
and read the pressure shown on
the gauge.
Pump pressure
is below
1650 ± 50 psi
6. Refer to the following table.
Verify proper fluid level before
beginning test.
2. Relieve pressure in system using
test harness and operating all
snowplow functions.
Pressure
Gauge
90° Elbow
Adapter
Motor slow/plow
functions slow
POSSIBLE
CAUSE
CORRECTIVE ACTION
• Pump relief valve may be out of
adjustment. Turn relief valve clockwise
1/4 turn and retest pressure. Repeat
until correct pressure (1650 ± 50 psi) is
obtained.
• If correct pressure is not obtained after
Pump Relief Valve
readjustment, remove and inspect the
relief valve and its components. Check
O-ring, stem and ball for wear or damage.
Reseat ball or replace relief valve as
needed. Reinstall/replace and readjust
valve, then retest pump pressure.
• Remove the pump and inspect the
O-ring between the pump and the valve
O-Ring
block for damage. Reinstall/replace
(between pump
and valve block)
O-ring and pump, then retest pump
pressure.
• Remove the pump and inspect it for
wear or broken gears. Replace pump if
Pump
needed, adjust pump relief valve, then
retest pressure.
Motor draws more
than 100 Amp at • Replace the motor.
pump relief.
Hose
Lit. No. 41298, Rev. 00
May 1, 2010
66
TROUBLESHOOTING GUIDE
BLADE DROP SPEED
ADJUSTMENT
WARNING
Keep 8' clear of the blade
drop zone when it is being
raised, lowered or angled. Do
not stand between the vehicle
and blade or directly in front
of blade. If the blade hits you
or drops on you, you could be
seriously injured.
The quill in the valve manifold adjusts
the blade drop speed.
1.
Lower the blade to the ground
before making adjustment.
Fluid Level
With Minute Mount ® 2 system
attached to the vehicle, activate
control and lower the blade to the
ground. Turn control OFF. Remove
the filler/breather plug.
Fill reservoir to within 2-1/2" from
the top of the fill hole and replace fill
plug.
For hydraulic fluid type and filling
instructions, see Hydraulic System,
Annual Fluid Change, in the
Maintenance section of the Owner's
Manual.
67
2. Turn the quill IN (clockwise) to
decrease drop speed. Turn the
quill OUT (counterclockwise) to
increase drop speed.
Quill
Lit. No. 41298, Rev. 00
May 1, 2010
TROUBLESHOOTING GUIDE
SCRAPE LOCK ADJUSTMENT
Pressure
Gauge
To Lift Ram Base
Hose
Scrape Lock
Adjustment
CAUTION
= Increase Pressure
Never operate the unit while
adjusting the scrape lock
valve. Doing so will damage
the scrape lock valve O-rings.
= Decrease Pressure
Follow the instructions below to
increase the pressure setting of the
scrape lock feature. The snowplow
must be attached to the vehicle,
and the snowplow battery cable and
lighting harness must be connected
before beginning this procedure.
1.
Park the vehicle on a smooth,
level, hard surface, such as
concrete. Lower the blade to the
ground and turn the control OFF.
Leave the snowplow attached
to the vehicle. Turn the vehicle
ignition to the "OFF" position.
2. Disconnect the snowplow battery
cable from the vehicle battery
cable.
Lit. No. 41298, Rev. 00
9. While pressing the RAISE button
on the snowplow control, note
the hydraulic gauge pressure
reading as the blade is rising.
(The pressure can only be
read as the blade is rising. It
may be necessary to perform
this process more than once
to obtain an accurate reading.)
The recommended pressure is
350 psi.
3. Remove the hydraulic unit cover.
4. Loosen the breather/fill plug
slowly to relieve any pressure in
the reservoir.
5. Using a "Tee" fitting, install a
500–600 psi gauge in the lift ram
base hose.
6. Retighten the breather/fill plug.
7.
Reconnect the snowplow battery
cable to the vehicle battery
cable.
8. Turn the vehicle ignition to the
"ON" or "Accessory" position.
Turn the control ON.
10. If the hydraulic pressure reading
is less than 350 psi, increase
the pressure by turning the
scrape lock valve stem clockwise
1/4 turn and retest pressure.
NOTE: Adjustments should be
made in 1/4-turn increments.
11. Repeat Steps 9 and 10 until the
recommended pressure (350 psi)
is obtained.
NOTE: Adjusting the scrape
lock pressure in excess of the
recommended pressure will
increase amp draw and will
shorten the life of the plow motor.
12. Once the recommended
pressure is obtained, lower the
blade completely and turn the
control OFF. Turn the vehicle
ignition to the "OFF" position.
13. Disconnect the snowplow battery
cable from the vehicle battery
cable.
14. Loosen the breather/fill plug
slowly to relieve any pressure in
the reservoir.
15. Remove the hydraulic testing
"Tee" fitting and gauge from the
lift ram base hose.
16. Reconnect the lift ram base hose
and tighten securely.
CAUTION
Do not mix different kinds of
hydraulic fluid. Some fluids
are not compatible and may
cause performance problems
and product damage.
17. Check the hydraulic fluid level
and add if necessary.
18. Retighten the breather/fill plug.
19. Replace the hydraulic unit cover.
May 1, 2010
68
PILOT-OPERATED (POPPET STYLE) CHECK VALVE INSPECTION
1.
Remove O-ring boss plug, spring
and poppet.
2. Remove O-ring boss plug, spring
and spool with O-ring. Use long/
slender needle-nosed pliers to
remove spool.
3. Inspect springs, poppet, spool,
O-rings and poppet seat for
wear, damage or contamination.
O-Ring Boss Plug
Spring
Poppet
4. If the valve manifold block has a
steel poppet seat, use a strong
pencil magnet to push and pull
on the seat. If the seat moves at
all, reset with poppet seat tool
(PN 28530). If the problem is
not corrected, replace the valve
block.
5. Re-oil O-rings, install spool fully
into bore. Spool must insert
smoothly.
Spool
69
Valve Manifold
Block
6. Install poppet, springs and O-ring
boss plugs. Torque O-ring boss
plug to 60 in-lb.
Lit. No. 41298, Rev. 00
May 1, 2010
RELIEF VALVE INSPECTION AND ADJUSTMENT
Relief Valve Inspection
1.
Adjustment
Remove the valve stem, ball,
spacer and spring.
2. Look for broken or damaged
parts, contamination or missing
or damaged O-rings.
CAUTION
Be careful to strike stem
squarely. You can bend stem if
you do not strike it squarely.
3. If parts are in good condition,
place ball on hard wood block,
hold stem seat on ball and lightly
strike top of stem with a hammer.
This seats the ball and valve
stem.
4. Apply a light coat of anti-seize
or grease to stem threads.
Lubricate O-rings with hydraulic
fluid. Reassemble components
into valve block.
Hydraulic System
CAUTION
Relief Valve
Do not adjust relief valve while
it is under pressure.
1.
Adjust by tightening the relief
valve stem until it bottoms out
(until spring is fully compressed).
2. Back off valve stem (rotate
counterclockwise) the number of
turns indicated in the chart.
No. of Turns
Approximate Relief
Backed Off (CCW)
Valve Pressure
From Fully Seated
± 100 (psi)
C – Pump Relief*
2-1/2 – 2-3/4
A & B – Angle Cylinder Crossover Relief
1 – 1-1/4
D – Scrape Lock
1/2 – 3/4
* See Pump Pressure Test to measure actual pump relief pressure.
1650
4000
350
NOTE: Relief Valve Service: Apply one drop of low-strength threadlocker
to all relief valve stems. The spring for relief valve D is different from
the other springs and should not be interchanged. Spring is made of a
lighter wire and is gold in color.
Spring
70
Adjustment of Scrape Lock
Spring Spacer
Ball
See page 68.
A
B
O-Rings
Valve Stem
D
C
Lit. No. 41298, Rev. 00
May 1, 2010
NOTES
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Lit. No. 41298, Rev. 00
May 1, 2010
71
Fisher Engineering
50 Gordon Drive
Rockland, ME 04841
www.fisherplows.com
72
A SUBSIDIARY OF DOUGLAS DYNAMICS, L.L.C.
Copyright © 2010 Douglas Dynamics, L.L.C. All rights reserved. This material may not be reproduced or copied, in whole or in part, in any printed, mechanical, electronic, film or other distribution and
storage media, without the written consent of Fisher Engineering. Authorization to photocopy items for internal or personal use by Fisher Engineering outlets or snowplow owner is granted.
Fisher Engineering reserves the right under its product improvement policy to change construction or design details and furnish equipment when so altered without reference to illustrations or
specifications used. Fisher Engineering or the vehicle manufacturer may require or recommend optional equipment for snow removal. Do not exceed vehicle ratings with a snowplow. This product is
manufactured under the following US patents: 5,353,530; 5,420,480; 6,253,470; 6,944,978; RE 35,700; CAN patent 2,060,425 and other patents pending. Fisher Engineering offers a limited warranty
for all snowplows and accessories. See separately printed page for this important information. The following are registered (®) or unregistered (™) trademarks of Douglas Dynamics, L.L.C.: FISHER®,
Fish-Stik ®, HT Series™, Insta-Act ®, INTENSIFIRE™, Minute Mount ® 2, SECURITY GUARD™.
Printed in U.S.A.
Lit. No. 41298, Rev. 00
May 1, 2010
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