MG Minute Mount System with EZ-V V Blade, Insta

MG Minute Mount System with EZ-V V Blade, Insta
Fisher Engineering
July 1997
No. 21856
MECHANIC'S GUIDE
SNOWPLOW
CAUTION: Read this manual before servicing the FISHER® EZ-V™ snowplow.
TABLE OF CONTENTS
PREFACE
Preface ............................................................................................................. 2
Safety Information ........................................................................................... 3
Tools Required ................................................................................................ 5
Product Specifications .................................................................................... 5
Hose Routing ................................................................................................... 6
Hydraulic Unit Parts Diagram ......................................................................... 7
Solenoid Cartridge Valve Identification and Location .................................. 8
Relief Valve Identification and Location ........................................................ 9
Pilot Operated Check Valve Identification and Location ............................ 10
Vehicle Harness and Vehicle Cable Location .............................................. 11
Operating the Snowplow .............................................................................. 12
Theory of Operation ...................................................................................... 15
Hydraulic and Electrical Schematics ........................................................... 17
Electrical Schematic ......................................................................... 18
Hydraulic Schematic ........................................................................ 19
Angle Right ....................................................................................... 20
Angle Left .......................................................................................... 22
Right Retract ..................................................................................... 24
Right Extend ..................................................................................... 26
Left Retract ........................................................................................ 28
Left Extend ........................................................................................ 30
Scoop ................................................................................................ 32
Vee ..................................................................................................... 34
Raise .................................................................................................. 36
Lower ................................................................................................. 38
Hold in Raise Position – Hydraulic .................................................. 40
Striking an Object While Plowing Forward – Hydraulic ................. 41
Striking An Object While Back Dragging – Hydraulic .................... 42
Headlamps – Vehicle Only ............................................................... 43
High Beam Headlamps With Plow Connected to Vehicle .............. 44
Low Beam Headlamps With Plow Connected to Vehicle ............... 45
Troubleshooting Guide ................................................................................. 46
Removable Spring Tool ................................................................................. 70
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.
No. 21856
Service of your FISHER snowplow
equipment is best performed by your
local Fisher outlet. They know your
snowplow best and are interested in
your complete satisfaction.
2
July 1997
SAFETY INFORMATION
WARNING
WARNING
Indicates a potentially
hazardous situation that, if not
avoided, could result in death
or serious personal injury .
CAUTION
Indicates a situation that, if not
avoided, could result in minor
personal injury and/or damage
to product or property.
NOTE: Identifies tips, helpful
hints and maintenance
information the owner/operator
should know.
BEFORE YOU BEGIN
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
Remove blade assembly before
placing vehicle on hoist. Failure
to do this could result in
personal injury.
No. 21856
Do not exceed GVWR or GAWR
(including blade and ballast) as
found on the driver-side door
cornerpost of the vehicle.
•
•
Park the vehicle on a level
surface, place shift lever in
PARK or NEUTRAL and set
parking brake.
Leave the snowplow mounted
on the vehicle and lowered for
most service procedures,
unless told otherwise.
PERSONAL SAFETY
•
•
•
•
•
•
Wear only snug-fitting clothing
while working on your vehicle
or snowplow.
Do not wear jewelry or a
necktie, and secure long hair.
Be especially careful near
moving parts such as fan
blades, pulleys and belts.
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, for flammable liquids
and electrical fires, handy.
VENTILATION
HYDRAULIC SAFETY
WARNING
WARNING
Vehicle exhaust contains deadly
carbon monoxide (CO) gas.
Breathing this gas, even in low
concentrations, could cause
death. Never operate a vehicle
in an enclosed area without
venting exhaust to the outside.
If you work on the vehicle or
snowplow in a garage or other
enclosed area, be sure to vent
exhaust gas directly to the outside
through a leakproof exhaust hose.
FIRE AND EXPLOSION
Hydraulic oil under pressure
could cause skin injection
injury. If you are injured by
hydraulic oil, get medical
treatment immediately.
•
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.
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.
July 1997
3
SAFETY INFORMATION
BATTERY SAFETY
Please become familiar with the Safety and Instruction labels on the back of the blade!
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.
Batteries contain sulfuric acid
which burns skin, eyes and
clothing.
Disconnect the battery before
removing or replacing any
electrical components.
Instruction Label
Safety Label
Instruction Label
U.S. Patent
4,280,062, 4,999,935
5,353,530, 5,420,480
and other patents pending
MOUNTING PLOW
1. Drive vehicle forward fully engaging
pushplates into attachment arms.
4
Safety Label
2. Twist connecting pin to release tension.
3. Remove electrical covers on vehicle.
4. Attach electrical connector to
corresponding connector on vehicle.
5. Repeat these steps on passenger side
of vehicle.
6. Release carrying chain and reattach it
leaving plenty of slack.
7. Push headgear upward toward vehicle
until connecting pins snap in place.
8. Pull jack lever outward and raise the
jack leg.
WARNING
LOWER BLADE WHEN VEHICLE IS PARKED.
REMOVE BLADE ASSEMBLY BEFORE PLACING VEHICLE
ON HOIST.
DO NOT EXCEED GVWR OR GAWR INCLUDING BLADE
AND BALLAST.
Jack Lever
Jack
Leg
Jack
Stand
Connecting
Pin Withdrawn
Jack Leg
CAUTION
Headgear
Lift Arm
Pushplate
Connecting Pin
Carrying
Chain
Attachment
Arm
READ OWNER'S MANUAL BEFORE OPERATING OR
SERVICING SNOWPLOW.
TRANSPORT SPEED SHOULD NOT EXCEED 45 MPH.
REDUCE SPEED UNDER ADVERSE TRAVEL
CONDITIONS.
Jack Leg (Raised)
PLOWING SPEED SHOULD NOT EXCEED 10 MPH.
PLOW REMOVAL
9. Remove slack from carrying chain and
reattach.
10. Back vehicle away from plow.
No. 21856
5. Disconnect electrical connectors and
cover with protective covers.
6. Insert release rod in lowest possible slot
on jack leg above A-frame.
7. Push down on release rod as you pull
and twist connecting pin.
8. Repeat these steps on passenger side
of vehicle.
1. Position blade in the “straight” mode
before removing.
2. Place control in “Lower” mode.
3. Push lift arm down.
4. Pull jack lever outward. Jack leg will
adjust to proper height.
REMOVE SLACK FROM CARRYING CHAIN BEFORE
TRAVELING.
SEE YOUR FISHER OUTLET FOR APPLICATION
RECOMMENDATIONS.
21793
21763
July 1997
TOOLS REQUIRED
PRODUCT SPECIFICATIONS
Tools
V-Plow Specifications
For servicing the electrical and
hydraulic system
Hydraulic System
Required:
•
•
•
•
•
Miniature Needle Nose Pliers
Flat Screwdriver
Combination Wrenches: 3/8",
7/16" (2), 1/2", 11/16", 3/4", 7/8"
1/4" Socket or Nut driver
Test Light
Recommended :
•
•
•
•
•
•
Combination Wrenches:
1-1/16", 1-1/8"
Deep Sockets: 11/16", 7/8",
1-1/16", 1-1/8"
Torque Wrench ( IN-LB )
Volt/Ohm Meter
Pencil Magnet
3000 PSI Pressure Gauge
For replacing trip springs :
•
Removable Spring Tool —
available from your Fisher
outlet
Relief valve settings
• Pump relief valve = 1750 PSI.
2 1/2 - 2 3/4 turns CCW from
fully seated
•
•
Primary relief valve = 3000 PSI.
1 1/2 - 1 3/4 turns CCW from
fully seated
Secondary relief valve = 3500
PSI. 1 1/4 - 1 1/2 turns CCW
from fully seated
Fluid Capacity—Hydraulic Oil
• Unit Reservoir = 1 3/4 Quarts
• System Total = 2 1/2 Quarts
Hydraulic Oil
CAUTION
Do not mix different types of
hydraulic fluid. Some fluids are
not compatible and may cause
performance problems and
product damage.
•
FISHER® High Performance
Fluid to -25°F (-32°C)
Electrical System – approximate
values:
•
Solenoid Coil Resistance =
7 Ohms at room temperature
•
Solenoid Coil Amp. Draw =
1.5 Amp.
•
Motor Relay Coil Resistance =
16 - 17 Ohms
•
Motor Relay Amp. Draw =
0.7 Amp.
•
Maximum Motor Amp. Draw =
190 Amp.
•
Headlamp Relay Coil
Resistance = 106 Ohms
•
Headlamp Relay Amp Draw =
0.1 Amp.
Mechanical
Fastener Torque for :
• Pump Bolts = 150–160 IN-LB
• Motor Bolts = 30–40 IN-LB
• Reservoir Bolts = 15–20 IN-LB
• Cartridge Torque = 120 IN-LB
• Check Valve Torque =
120 IN-LB
• Coil Nut Torque = 48–60 IN-LB
• Secondary Manifold Block
Assembly Bolt Torque =
108 IN-LB
• Angle Cylinder
Piston Locknut Torque =
100-120 FT-LB
Gland Nut Torque =
150-180 FT-LB.
Fuse Size
•
Harness – 10 Amp.
(10AFB 3AG)
•
Circuit Board (2) – 5 Amp.
(5AFB SMD)
Solenoid Valve Spool Travel = 0.07"
for three- and four-way valves
No. 21856
July 1997
5
HOSE ROUTING
Hydraulic
Unit
45° Street Elbow and
Straight Swivel
45° Swivel
90° Street Elbow
and Straight Swivel
18" Hose
Lift Cylinder
6
36" Hoses
36" Hose
34" Hose
Passenger-Side
Angle Cylinder
(Right Side)
Driver-Side
Angle Cylinder
(Left Side)
PLOW SIDE
No. 21856
July 1997
HYDRAULIC UNIT PARTS DIAGRAM
Motor
Solenoid Valve Coil
Solenoid Valve Cartridge
Primary Valve
Block
Relief Valve
7
Secondary Valve Block
Pump
Oil Return Line
Pump Filter
Pilot Operated
Check Valve
Reservoir
No. 21856
July 1997
SOLENOID CARTRIDGE VALVE IDENTIFICATION AND LOCATION
Solenoid Cartridge
Valve—S1
Solenoid Cartridge
Valve—S3
Solenoid Cartridge
Valve—S2
Solenoid Cartridge
Valve—S6
Solenoid Cartridge
Valve—S4
8
Solenoid Cartridge
Valve—S5
No. 21856
July 1997
RELIEF VALVE IDENTIFICATION AND LOCATION
RIGHT SECONDARY
RELIEF VALVE
(Passenger Side)
RIGHT PRIMARY
RELIEF VALVE
(Passenger Side)
9
LEFT PRIMARY
RELIEF VALVE
(Driver Side)
PUMP RELIEF VALVE
No. 21856
LEFT SECONDARY
RELIEF VALVE
(Driver Side)
July 1997
PILOT OPERATED CHECK VALVE IDENTIFICATION AND LOCATION
PILOT OPERATED (P/O)
CHECK VALVE B
10
PILOT OPERATED (P/O)
CHECK VALVE D
PILOT
OPERATED (P/O)
CHECK VALVE A
No. 21856
PILOT OPERATED (P/O)
CHECK VALVE C
July 1997
VEHICLE HARNESS AND VEHICLE CABLE LOCATION
MOD
E
P
C
S
LO
Control
RA
R
E
E
ISE
V
/
PWR
R
Motor Relay
22" Red Cable
Black Wire
To Negative
Battery Terminal
FLT
L
/
WE
+
Secondary
(Large)
Terminals
-
ON/OFF
Switch
Control
Bracket
Primary
(Small)
Terminals
Brown/Red
Brown/Green
Vehicle Cable
Assembly
Orange/
Black
Red Wire
S
W mall
ire R
e
d
Faston
Connector
Firewall
Grommet
14-pin Connector
(in-cab)
11
Red Wire
Vehicle
Harness
3-pin
Fuse
Holder
Self-Stripping
Connector (Blue)
12-pin
Vehicle Wire Controlled
by Ignition Switch
Grille
Connectors
Wires to
Headlamp Relays
No. 21856
July 1997
OPERATING THE SNOWPLOW
Fish-Stik™ Hand-Held Control
WARNING
The driver shall keep
bystanders clear of the blade
when it is being raised, lowered
or angled. Do not stand
between the vehicle and the
blade, or within 8 feet of a
moving blade. A moving or
falling blade could cause
personal injury.
Function Time Outs
Smooth Stop
All control functions, except for
LOWER, automatically time out—
stop—after a period of time. This is to
help prolong the battery charge. The
time-out period for the RAISE
function is 2.5 seconds, while all
others are 4.25 seconds.
The control automatically allows the
blade to coast to a stop. This results
in smoother operation, reduces the
shock to the hydraulic system and
increases hose and valve life.
The control will automatically turn off
after being idle for 20 minutes.
CAUTION
To prevent accidental
movement of the blade, always
turn the ON/OFF switch to OFF
whenever the snowplow is not
in use. The control indicator
light will turn off.
1. Turn the vehicle ignition switch
to the ON or the ACCESSORY
position.
No. 21856
12
2. Press the PWR button on the
control. The control indicator
light will glow red indicating the
control is on. The control
indicator light will glow red
whenever the control ON/OFF
switch and the vehicle ignition
switch are both ON and the
plow plugs are connected to
the grill connectors.
July 1997
OPERATING THE SNOWPLOW
Straight Blade Mode—Default
The control automatically defaults to
the straight blade mode when turned
on. The MODE lamp, near the MODE
key in the upper left corner of the
keypad, will not be illuminated or
flashing when the control is in the
straight blade mode.
The functions shown at right are
performed in the straight blade mode:
Button
Description of Operation
Raise
Press this button to raise the plow and to cancel the float mode.
NOTE: Plow will automatically stop raising after 2.5 seconds. To resume raising the plow, release the button
and press again.
Press this button to lower the plow. NOTE: After reaching the desired height, release the button. Holding the
button down for more than 3/4 second will activate the float mode, indicated by green FLT lamp.
Press this button to angle both wings to the left.
Press this button to angle both wings to the right.
Lower
L / SCP
R / VEE
13
Vee/Scoop Mode
Quickly press and release the MODE
key to put the control into the vee/
scoop mode. The MODE lamp, near
the upper left corner of the keypad,
will light. Quickly pressing and
releasing the MODE key will toggle
the control between straight blade
mode and vee/scoop mode.
The functions shown at right are
performed in the vee/scoop mode:
No. 21856
Button
Description of Operation
Raise
Press this button to raise the plow and to cancel the float mode.
NOTE: Plow will automatically stop raising after 2.5 seconds. To resume raising the plow, release the button
and press again.
Press this button to lower the plow. NOTE: After reaching the desired height, release the button. Holding the
button down for more than 3/4 second will activate the float mode, indicated by green FLT lamp.
Press this button to extend both wings to the scoop position.
Press this button to retract both wings to the vee position.
Lower
L / SCP
R / VEE
July 1997
OPERATING THE SNOWPLOW
Wing Mode
To put the control into the wing mode,
press and hold the MODE key for
about two seconds until the MODE
lamp near the upper left corner of the
keypad is flashing. The L / SCP and
R / VEE keys are used to activate the
four functions of the wing mode. The
RAISE and LOWER keys function the
same as in the other modes.
The functions shown at right are
performed in the wing mode:
Button
Description of Operation
Raise
Press this button to raise the plow and to cancel the float mode.
NOTE: Plow will automatically stop raising after 2.5 seconds. To resume raising the plow, release the
button and press again.
Press this button to lower the plow. NOTE: After reaching the desired height, release the button.
Holding the button down for more than 3/4 second will activate the float mode, indicated by green FLT
lamp.
Pressing this button the first time will retract the left wing.
Pressing this button the next time will extend the left wing.
Pressing this button the first time will retract the right wing.
Pressing this button the next time will extend the right wing.
Lower
L / SCP
R / VEE
14
No. 21856
July 1997
THEORY OF OPERATION
Plow Hydraulics
The EZ-V™ snowplow
hydraulic system performs
10 blade movement
functions.
CONTROLLER MODE
CONTROLLER BUTTON
BLADE
MOVEMENT
All functions 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.
Nine of the ten hydraulic functions
require energizing the electric motor,
shifting of solenoid cartridge spools
or activating p/o check valves. The
tenth function, lower, does not
energize the motor but requires
shifting of solenoid cartridge spools.
Operation of Electrical Circuit:
The electrical drive circuit that is used
for the EZ-V snowplow hydraulics is
defined as a low side drive system.
No. 21856
STRAIGHT BLADE
(DEFAULT)
R/VEE
ANGLE
RIGHT
L/SCP
ANGLE
LEFT
V / SCOOP
WING
R/VEE *
R/VEE *
L/SCP *
L/SCP *
RIGHT
RIGHT
LEFT
LEFT
RETRACT EXTEND RETRACT EXTEND
Low side drive provides a common
live hot (12V) to all of the loads (coils,
relays, etc.). When the cab control is
activated, the ground path is closed
to complete the circuit, energizing the
selected coils and/or relay. The
current flow through the coils
produces a magnetic field which
shifts the spools in the cartridges.
The cartridges direct the fluid flow to
the appropriate passages to produce
the selected blade movement
function. Current flow also energizes
the motor relay, closing the motor
relay contacts connecting the motor
to the battery through heavy electrical
cables. The heavy cables carry a
L/SCP
SCOOP
R/VEE
VEE
ALL
ALL
RAISE
LOWER
RAISE
LOWER
large current flow which energizes the
motor, which in-turn rotates the
internal pump and creates fluid flow.
(Motor relay does not energize in
“lower” function).
Testing Low Side Drive Systems:
15
To test a low side drive system,
connect the negative lead of the test
instrument (volt meter) to ground and
the positive lead to the negative side
of the load (coil, relay, etc.). A
reading of 12 volts should be
indicated when the load is not
activated. A reading of near 0 volts
when load is activated.
July 1997
THEORY OF OPERATION
Plow Headlamps
The headlamp circuit operates using
a high side drive system. High side
drive provides a hot 12V source to
activate the loads (coils, relays, etc.)
that share a common ground. The
headlamp switching circuit uses two
single pole double throw (SPDT)
relays. When combined with the
snowplow plug-in headlamp harness
and the vehicle harness, the relays
will automatically switch between
plow and vehicle headlamps as the
plow plugs are connected and
disconnected.
The vehicle harness has a brown
wire that is spliced into the vehicle
park lamp circuit. This wire feeds the
plow park lamps through the grill
connector and also powers the coils
No. 21856
of both relays. The other terminal of
the relay coils is connected to the
black/orange ground wire which also
goes to the grill connector. When
both the plow and battery cable plugs
are connected to the grill connectors,
a ground is completed for the relay
coil. When the vehicle park lamps
are turned on and the plugs are
connected, the relay coils will be
activated. This causes the relay
contacts to switch from the normally
closed contacts to the normally open
contacts. The normally closed
contacts power the vehicle
headlamps. The normally open
contacts power the plow headlamps.
Refer to the Headlamp Test Diagram
in the Troubleshooting Guide.
It should be noted that:
•
The relay with the yellow,
orange and black wires
operates the low beam
headlamps.
•
The relay with the green, red
and white wires operates the
high beam headlamps.
•
The parking lamp circuit
provides power to both relays
at the same time.
•
Both plow plugs (12 pin and
battery cable) need to be
connected and the headlamp
switch must be on for the
relays to activate.
Daytime Running Lights
An additional fused pink wire is used
in place of the brown park circuit wire
to introduce power to the light relays.
The pink wire is connected to a circuit
controlled by the vehicle ignition
switch. When the vehicle ignition is
on and the grill connector plugs are
connected the relay coils will be
activated. This allows the DRLs to be
switched to the plow lights when the
vehicle headlamp switch is off. DRLs
use the same circuit as the regular
headlamps.
Testing High Side Drive Systems:
Connect the negative lead of the test
instrument (voltmeter) to ground and
positive lead to the positive side of
the load. A reading of 12 volts should
be indicated when the load is
activated; zero volts when load is not
activated.
July 1997
16
HYDRAULIC AND ELECTRICAL SCHEMATICS
The following 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 of the
components in the system. Each
component is represented by a
graphical symbol. The hydraulic and
electrical legends list and describe
each of the symbols used in the
schematics for this guide.
The first two schematics show a
general overview of the complete
hydraulic and electrical systems. The
remainder of the schematics have
been altered to highlight flow of
hydraulic oil and electrical current for
each function the hydraulic unit
performs or flow of electrical current
for the snowplow and vehicle lights.
•
•
Bold lines represent the circuit
being activated only.
Shaded components are either
activated or shifted from their
normal position.
No. 21856
HYDRAULIC LEGEND
ELECTRICAL LEGEND
LINE, WORKING (MAIN)
SPRING
LINE, PILOT (FOR CONTROL)
SOLENOID, SINGLE WINDING
CROSSING WIRE
WIRE SPLICE
LINES JOINING
FLOW, DIRECTION OF
HYDRAULIC FLUID
LINES CROSSING
PILOT OPERATED (P/O)
CHECK VALVE
WIRE CONTINUES
ELSEWHERE
VALVE, ADJUSTABLE
PRESSURE RELIEF
LINE, TO RESERVOIR
BELOW FLUID LEVEL
HYDRAULIC PUMP
FIXED DISPLACEMENT
VALVE, FLOW CONTROL,
ADJUSTABLENON-COMPENSATED
CYLINDER
VALVE, TWO POSITION
TWO CONNECTION
(TWO-WAY)
ELECTRIC MOTOR
VALVE, TWO POSITION
THREE CONNECTION
(THREE-WAY)
FILTER,STRAINER
DIFFUSER
IN LINE CONNECTOR
VALVE, TWO POSITION
FOUR CONNECTION
(FOUR-WAY)
FUSE
SOLENOID
CIRCUIT GROUND
17
MOTOR RELAY
BATTERY
MOTOR
LIGHT
COMPONENT ENCLOSURE
COMPONENT ENCLOSURE
July 1997
ELECTRICAL SCHEMATIC
COMPONENTS LOCATED FRONT LEFT OF VEHICLE
LOW
HIGH
YEL
ORN
GRN
RED
BLK (HIGH)
GRY
LOW BEAM
HIGH BEAM
*
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TO PARK LAMP
M BULLET
P
RED
BRN
WHT
LOCATED AT GRILLE
TURN SIG
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
VIO
BRN
RED
FASTON
10AFB
#6 RED
#6 RED
MTR RLY
#6 BLK
LOCATED AT VEHICLE FRONT RIGHT
1
2
3
4
1
2
3
4
TURN SIG
T
TO RIGHT TURN SIG
M BULLET
GRY
LOCATED UNDER DASH
LT BLU/ORN
1
BLU/ORN
2
BLK/WHT
3
LT GRN
4
LT BLU
5
WHT/YEL
6
BRN/RED
7
8
9
BRN/GRN
10
11
12
13
14
IGNITION
* REPRESENTATION
OF PRINTED
CIRCUIT BOARD
T
WHT/YEL
S1 SOLENOID
LT GRN
LT BLU
S2 SOLENOID
BLK/WHT
BLU/ORN
18
S3 SOLENOID
S4 SOLENOID
LT BLU/ORN
BLK/ORN
VIO
BRN
BLK
WHT
3
COIL CORD HARNESS
YEL
1
VIO
2
GRY
3
WHT
4
ORN
5
BLU
6
GRN
7
RED
8
TAN
9
BRN
10
BLK
11
12V BATTERY
2
TO LEFT TURN SIG
M BULLET
BLK/ORN
ORN/BLK
1
H
1
1
2
2
L
3
3
CON3 CON3
HEADLIGHT
P
TO
HEADLAMP
HARNESS
ORN (LOW)
BLK
CONTROL
LEFT SIDE PLOW LAMP
BLU (GND)
S5 SOLENOID
S6 SOLENOID
RED
BLK/ORN
#6 RED
+
M
-
BLU
GND
TO VEHICLE
HEADLIGHT CONNECTOR
PLOW ASSEMBLY
PUMP MOTOR
#6 BLK
RIGHT SIDE PLOW LAMP
H
1
1
2
2
L
3
3
CON3 CON3
HEADLIGHT
P
T
P
TURN SIG
T
TURN SIG
No. 21856
July 1997
HYDRAULIC SCHEMATIC
SECONDARY BLOCK ASSY.
SECONDARY
RELIEF VALVE
3000 PSI
RIGHT
PRIMARY BLOCK ASSY.
3500 PSI
PRIMARY
RELIEF
VALVE
S6
P/O CHECK
VALVE
P/O
CHECK
VALVE
(A)
(C)
(D)
S2
P/O
CHECK
VALVE
LEFT
CONTROLLER MODE
CONTROLLER BUTTON
BLADE
MOVEMENT
MOTOR
SV08-2004
SV08-40
SV08-43
SV08-30
SV08-40
SV08-30
No. 21856
M
S1
S2
S3
S4
S5
S6
19
3500 PSI
S4
S1
SECONDARY
RELIEF VALVE
1750 PSI
3000 PSI
STRAIGHT BLADE
(DEFAULT)
R/VEE
ANGLE
RIGHT
ON
L/SCP
ANGLE
LEFT
ON
WING
R/VEE *
R/VEE *
ON
L/SCP *
RIGHT
RIGHT
LEFT
LEFT
RETRACT EXTEND RETRACT EXTEND
ON
ON
ON
ON
V / SCOOP
L/SCP *
ON
ON
ON
ON
ON
ON
(B)
S3
S5
PRIMARY
RELIEF
VALVE
P/O
CHECK
VALVE
L/SCP
SCOOP
ON
ON
ON
R/VEE
VEE
ALL
ALL
RAISE
LOWER
RAISE
LOWER
ON
ON
ON
ON
ON
PUMP
RELIEF
VALVE
M
LIFT
ON
ON
* NOTE - SEE BLADE MOVEMENT TEXT
FOR BUTTON OPERATION
ON
July 1997
ANGLE RIGHT – ELECTRICAL
Blade Movement: Angle Right
Controller Mode: Straight Blade
Mode (Default)
Controller Button: R/VEE
System Response:
1) By pressing the controller button,
the circuit board within the cab
control completes the ground
path for the electrical circuit.
2) Electrical current flows through
the motor relay, activating the
pump motor, and solenoid
cartridge valve S5, shifting its
spool.
3) Hydraulic oil from the pump flows
through solenoid cartridge valve
S2, P/O check valve (B) and into
the rod end of the right cylinder
causing it to retract.
4) Pressure within the hydraulic
circuit causes P/O check valves
(A) & (D) to open.
5) The retracting right cylinder
pushes the hydraulic oil out of its
base end, through solenoid
COMPONENTS LOCATED FRONT LEFT OF VEHICLE
5
6
7
8
9
10
11
IGNITION
* REPRESENTATION
OF PRINTED
CIRCUIT BOARD
RED
BLADE MOVEMENT
ANGLE RIGHT
LOCATED AT GRILLE
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
VIO
BRN
WHT/YEL
RED
FASTON
10AFB
#6 RED
#6 RED
MTR RLY
#6 BLK
1
2
3
4
20
S1 SOLENOID
LT GRN
LT BLU
S2 SOLENOID
BLK/WHT
BLU/ORN
S3 SOLENOID
S4 SOLENOID
LT BLU/ORN
S6 SOLENOID
RED
BLK/ORN
#6 RED
1
2
3
4
S5 SOLENOID
#6 BLK
+
M
-
4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
WHT
BLK/ORN
VIO
BRN
BLK
WHT
3
LOCATED UNDER DASH
LT BLU/ORN
1
BLU/ORN
2
BLK/WHT
3
LT GRN
4
LT BLU
5
WHT/YEL
6
BRN/RED
7
8
9
BRN/GRN
10
11
12
13
14
12V BATTERY
COIL CORD HARNESS
YEL
1
VIO
2
GRY
3
WHT
4
ORN
5
BLU
6
GRN
7
RED
8
TAN
9
BRN
10
BLK
11
2
BRN
GRY
LEFT SIDE PLOW LAMP
1
No. 21856
PLOW ASSEMBLY
*
ORN/BLK
CONTROL
cartridge valves S6 & S5 & S4
and into the base end of the left
cylinder causing it to extend.
6) The extending left cylinder
pushes the hydraulic oil out of its
rod end, through P/O check valve
(A), solenoid cartridge valves S3
& S2 and back to the reservoir.
PUMP MOTOR
RIGHT SIDE PLOW LAMP
LOCATED AT VEHICLE FRONT RIGHT
July 1997
ANGLE RIGHT – HYDRAULIC
SECONDARY BLOCK ASSY.
SECONDARY
RELIEF VALVE
3000 PSI
RIGHT
PRIMARY BLOCK ASSY.
3500 PSI
PRIMARY
RELIEF
VALVE
S6
P/O CHECK
VALVE
P/O
CHECK
VALVE
(A)
(C)
P/O
CHECK
VALVE
(B)
S3
S5
(D)
S2
P/O
CHECK
VALVE
PRIMARY
RELIEF
VALVE
LEFT
STRAIGHT BLADE
(DEFAULT)
CONTROLLER BUTTON
R/VEE
L/SCP
ANGLE
RIGHT
ANGLE
LEFT
MOTOR
SV08-2004
SV08-40
SV08-43
SV08-30
SV08-40
SV08-30
No. 21856
M
S1
S2
S3
S4
S5
S6
3500 PSI
S4
S1
SECONDARY
RELIEF VALVE
1750 PSI
3000 PSI
CONTROLLER MODE
BLADE
MOVEMENT
21
ON
ON
WING
R/VEE *
R/VEE *
ON
L/SCP *
RIGHT
RIGHT
LEFT
LEFT
RETRACT EXTEND RETRACT EXTEND
ON
ON
ON
ON
V / SCOOP
L/SCP *
ON
ON
ON
ON
ON
ON
L/SCP
R/VEE
SCOOP
VEE
ON
ON
ON
ALL
ALL
RAISE
LOWER
RAISE
LOWER
ON
ON
ON
ON
ON
PUMP
RELIEF
VALVE
M
LIFT
ON
ON
* NOTE - SEE BLADE MOVEMENT TEXT
FOR BUTTON OPERATION
ON
July 1997
ANGLE LEFT – ELECTRICAL
Blade Movement: Angle Left
Controller Mode: Straight Blade
Mode (Default)
Controller Button: L/SCP
System Response:
1) By pressing the controller button,
the circuit board within the cab
control completes the ground
path for the electrical circuit.
2) Electrical current flows through
the motor relay, activating the
pump motor, and solenoid
cartridge valves S2 & S5, shifting
both spools.
3) Hydraulic oil from the pump flows
through solenoid cartridge valves
S2 & S3, P/O check valve (A)
and into the rod end of the left
cylinder causing it to retract.
4) Pressure within the hydraulic
circuit causes P/O check valves
(B) & (C) to open.
5) The retracting left cylinder
pushes the hydraulic oil out of its
base end, through solenoid
COMPONENTS LOCATED FRONT LEFT OF VEHICLE
5
6
7
8
9
10
11
IGNITION
* REPRESENTATION
OF PRINTED
CIRCUIT BOARD
RED
BLADE MOVEMENT
ANGLE LEFT
LOCATED AT GRILLE
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
VIO
BRN
WHT/YEL
RED
FASTON
10AFB
#6 RED
#6 RED
MTR RLY
#6 BLK
1
2
3
4
S1 SOLENOID
LT GRN
LT BLU
22
S2 SOLENOID
BLK/WHT
BLU/ORN
S3 SOLENOID
S4 SOLENOID
LT BLU/ORN
S6 SOLENOID
RED
BLK/ORN
#6 RED
1
2
3
4
S5 SOLENOID
#6 BLK
+
M
-
4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
WHT
BLK/ORN
VIO
BRN
BLK
WHT
3
LOCATED UNDER DASH
LT BLU/ORN
1
BLU/ORN
2
BLK/WHT
3
LT GRN
4
LT BLU
5
WHT/YEL
6
BRN/RED
7
8
9
BRN/GRN
10
11
12
13
14
12V BATTERY
COIL CORD HARNESS
YEL
1
VIO
2
GRY
3
WHT
4
ORN
5
BLU
6
GRN
7
RED
8
TAN
9
BRN
10
BLK
11
2
BRN
GRY
LEFT SIDE PLOW LAMP
1
No. 21856
PLOW ASSEMBLY
*
ORN/BLK
CONTROL
cartridge valves S4 & S5 & S6
and into the base end of the right
cylinder causing it to extend.
6) The extending right cylinder
pushes the hydraulic oil out of its
rod end, through P/O check valve
(B), solenoid cartridge valve S2
and back to the reservoir.
PUMP MOTOR
RIGHT SIDE PLOW LAMP
LOCATED AT VEHICLE FRONT RIGHT
July 1997
ANGLE LEFT – HYDRAULIC
SECONDARY BLOCK ASSY.
SECONDARY
RELIEF VALVE
3000 PSI
RIGHT
PRIMARY BLOCK ASSY.
3500 PSI
PRIMARY
RELIEF
VALVE
S6
P/O CHECK
VALVE
P/O
CHECK
VALVE
(A)
P/O
CHECK
VALVE
(B)
(C)
S3
S5
(D)
S2
P/O
CHECK
VALVE
PRIMARY
RELIEF
VALVE
LEFT
CONTROLLER MODE
CONTROLLER BUTTON
BLADE
MOVEMENT
MOTOR
SV08-2004
SV08-40
SV08-43
SV08-30
SV08-40
SV08-30
No. 21856
M
S1
S2
S3
S4
S5
S6
23
3500 PSI
S4
S1
SECONDARY
RELIEF VALVE
1750 PSI
3000 PSI
STRAIGHT BLADE
(DEFAULT)
R/VEE
L/SCP
ANGLE
RIGHT
ANGLE
LEFT
ON
ON
WING
R/VEE *
R/VEE *
ON
L/SCP *
LEFT
RIGHT
RIGHT
LEFT
RETRACT EXTEND RETRACT EXTEND
ON
ON
ON
ON
V / SCOOP
L/SCP *
ON
ON
ON
ON
ON
ON
L/SCP
R/VEE
SCOOP
VEE
ON
ON
ON
ALL
LOWER
RAISE
LOWER
ON
ON
ON
ON
ON
M
ALL
RAISE
PUMP
RELIEF
VALVE
LIFT
ON
ON
* NOTE - SEE BLADE MOVEMENT TEXT
FOR BUTTON OPERATION
ON
July 1997
RIGHT RETRACT – ELECTRICAL
Blade Movement: Right Retract
Controller Mode: Wing Mode
Controller Button: R/VEE
This button toggles between retract
and extend in wing mode. Upon
entering wing mode, the first
activation of this button and every
other activation thereafter retracts
the wing. The second activation of
this button and every other
activation thereafter extends the
wing.
path for the electrical circuit.
2) Electrical current flows through
the motor relay activating the
pump motor.
3) Hydraulic oil from the pump flows
through solenoid cartridge valve
S2, P/O check valve (B) and into
the rod end of the right cylinder
causing it to retract.
System Response:
1) By pressing the controller button,
the circuit board within the cab
control completes the ground
COMPONENTS LOCATED FRONT LEFT OF VEHICLE
5
6
7
8
9
10
11
IGNITION
* REPRESENTATION
OF PRINTED
CIRCUIT BOARD
RED
BLADE MOVEMENT
RIGHT RETRACT
LOCATED AT GRILLE
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
VIO
BRN
WHT/YEL
RED
FASTON
10AFB
#6 RED
#6 RED
MTR RLY
#6 BLK
1
2
3
4
24
S1 SOLENOID
LT GRN
LT BLU
S2 SOLENOID
BLK/WHT
BLU/ORN
S3 SOLENOID
S4 SOLENOID
LT BLU/ORN
S6 SOLENOID
RED
BLK/ORN
#6 RED
1
2
3
4
S5 SOLENOID
#6 BLK
+
M
-
4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
WHT
BLK/ORN
VIO
BRN
BLK
WHT
3
LOCATED UNDER DASH
LT BLU/ORN
1
BLU/ORN
2
BLK/WHT
3
LT GRN
4
LT BLU
5
WHT/YEL
6
BRN/RED
7
8
9
BRN/GRN
10
11
12
13
14
12V BATTERY
COIL CORD HARNESS
YEL
1
VIO
2
GRY
3
WHT
4
ORN
5
BLU
6
GRN
7
RED
8
TAN
9
BRN
10
BLK
11
2
BRN
GRY
LEFT SIDE PLOW LAMP
1
No. 21856
PLOW ASSEMBLY
*
ORN/BLK
CONTROL
4) Pressure within the hydraulic
circuit causes P/O check valves
(A) & (D) to open.
5) The retracting right cylinder
pushes the hydraulic oil out of its
base end, through solenoid
cartridge valves S6 & S5, P/O
check valve (D) and back to the
reservoir.
PUMP MOTOR
RIGHT SIDE PLOW LAMP
LOCATED AT VEHICLE FRONT RIGHT
July 1997
RIGHT RETRACT – HYDRAULIC
SECONDARY BLOCK ASSY.
SECONDARY
RELIEF VALVE
3000 PSI
RIGHT
PRIMARY BLOCK ASSY.
3500 PSI
PRIMARY
RELIEF
VALVE
S6
P/O CHECK
VALVE
P/O
CHECK
VALVE
(A)
P/O
CHECK
VALVE
(B)
(C)
S3
S5
(D)
S2
P/O
CHECK
VALVE
PRIMARY
RELIEF
VALVE
LEFT
STRAIGHT BLADE
(DEFAULT)
CONTROLLER BUTTON
R/VEE
L/SCP
ANGLE
RIGHT
ANGLE
LEFT
MOTOR
SV08-2004
SV08-40
SV08-43
SV08-30
SV08-40
SV08-30
No. 21856
M
S1
S2
S3
S4
S5
S6
3500 PSI
S4
S1
SECONDARY
RELIEF VALVE
1750 PSI
3000 PSI
CONTROLLER MODE
BLADE
MOVEMENT
25
ON
ON
WING
R/VEE *
R/VEE *
ON
L/SCP *
LEFT
RIGHT
LEFT
RIGHT
RETRACT EXTEND RETRACT EXTEND
ON
ON
ON
ON
V / SCOOP
L/SCP *
ON
ON
ON
ON
ON
ON
L/SCP
R/VEE
SCOOP
VEE
ON
ON
ON
ALL
ALL
RAISE
LOWER
RAISE
LOWER
ON
ON
ON
ON
ON
PUMP
RELIEF
VALVE
M
LIFT
ON
ON
* NOTE - SEE BLADE MOVEMENT TEXT
FOR BUTTON OPERATION
ON
July 1997
RIGHT EXTEND – ELECTRICAL
Blade Movement: Right Extend
Controller Mode: Wing Mode
Controller Button: R/VEE
This button toggles between
retract and extend in wing mode.
Upon entering wing mode, the
first activation of this button and
every other activation thereafter
retracts the wing. The second
activation of this button and every
other activation thereafter
extends the wing.
System Response:
1) By pressing the controller button,
the circuit board within the cab
control completes the ground
path for the electrical circuit.
2) Electrical current flows through
the motor relay, activating the
pump motor, and solenoid
cartridge valve S6, shifting its
spool.
3) Hydraulic oil from the pump flows
through solenoid cartridge valve
COMPONENTS LOCATED FRONT LEFT OF VEHICLE
5
6
7
8
9
10
11
IGNITION
* REPRESENTATION
OF PRINTED
CIRCUIT BOARD
RED
BLADE MOVEMENT
RIGHT EXTEND
WHT
LOCATED AT GRILLE
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
VIO
BRN
RED
FASTON
10AFB
#6 RED
#6 RED
MTR RLY
#6 BLK
1
2
3
4
26
WHT/YEL
S1 SOLENOID
LT GRN
LT BLU
S2 SOLENOID
BLK/WHT
BLU/ORN
S3 SOLENOID
S4 SOLENOID
LT BLU/ORN
S6 SOLENOID
RED
BLK/ORN
#6 RED
1
2
3
4
S5 SOLENOID
#6 BLK
+
M
-
4
BRN
BLK/ORN
VIO
BRN
BLK
WHT
3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LOCATED UNDER DASH
LT BLU/ORN
1
BLU/ORN
2
BLK/WHT
3
LT GRN
4
LT BLU
5
WHT/YEL
6
BRN/RED
7
8
9
BRN/GRN
10
11
12
13
14
12V BATTERY
COIL CORD HARNESS
YEL
1
VIO
2
GRY
3
WHT
4
ORN
5
BLU
6
GRN
7
RED
8
TAN
9
BRN
10
BLK
11
2
GRY
LEFT SIDE PLOW LAMP
1
No. 21856
PLOW ASSEMBLY
*
ORN/BLK
CONTROL
Even though both sides of the
cylinder piston will experience the
same hydraulic pressure, the
cylinder will extend due to
unequal force. The difference in
area between the base end and
rod end of the cylinder piston
creates a greater force on the
base end which extends the
cylinder. Force = Pressure X
Surface Area.
5) Pressure within the hydraulic
circuit causes P/O check valves
(A) & (D) to
open.
S2, P/O check valve (B), solenoid
cartridge valve S6 and into the
base end of the right cylinder
causing it to extend.
4) The extending right cylinder
pushes the hydraulic oil out of its
rod end. This oil mixes with the
hydraulic oil from the pump,
passes through solenoid
cartridge valve S6 and into the
base end of the extending right
cylinder. This is called a
regenerative hydraulic circuit.
PUMP MOTOR
RIGHT SIDE PLOW LAMP
LOCATED AT VEHICLE FRONT RIGHT
July 1997
RIGHT EXTEND – HYDRAULIC
SECONDARY BLOCK ASSY.
SECONDARY
RELIEF VALVE
3000 PSI
RIGHT
PRIMARY BLOCK ASSY.
3500 PSI
PRIMARY
RELIEF
VALVE
S6
P/O CHECK
VALVE
P/O
CHECK
VALVE
(A)
P/O
CHECK
VALVE
(B)
(C)
S3
S5
(D)
S2
P/O
CHECK
VALVE
PRIMARY
RELIEF
VALVE
LEFT
STRAIGHT BLADE
(DEFAULT)
CONTROLLER BUTTON
R/VEE
L/SCP
ANGLE
RIGHT
ANGLE
LEFT
MOTOR
SV08-2004
SV08-40
SV08-43
SV08-30
SV08-40
SV08-30
No. 21856
M
S1
S2
S3
S4
S5
S6
3500 PSI
S4
S1
SECONDARY
RELIEF VALVE
1750 PSI
3000 PSI
CONTROLLER MODE
BLADE
MOVEMENT
27
ON
ON
WING
R/VEE *
R/VEE *
ON
V / SCOOP
L/SCP *
LEFT
RIGHT
RIGHT
LEFT
RETRACT EXTEND RETRACT EXTEND
ON
ON
ON
ON
L/SCP *
ON
ON
ON
ON
ON
ON
L/SCP
R/VEE
SCOOP
VEE
ON
ON
ON
ALL
ALL
RAISE
LOWER
RAISE
LOWER
ON
ON
ON
ON
ON
PUMP
RELIEF
VALVE
M
LIFT
ON
ON
* NOTE - SEE BLADE MOVEMENT TEXT
FOR BUTTON OPERATION
ON
July 1997
LEFT RETRACT – ELECTRICAL
Blade Movement: Left Retract
Controller Mode: Wing Mode
Controller Button: L/SCP
This button toggles between retract
and extend in wing mode. Upon
entering wing mode, the first
activation of this button and every
other activation thereafter retracts
the wing. The second activation of
this button and every other
activation thereafter extends the
wing.
System Response:
3) Hydraulic oil from the pump flows
through solenoid cartridge valves
S2 & S3, P/O check valve (A),
and into the rod end of the left
cylinder causing it to retract.
4) Pressure within the hydraulic
circuit causes P/O check valves
(B) & (C) to open.
1) By pressing the controller button,
the circuit board within the cab
control completes the ground
path for the electrical circuit.
2) Electrical current flows through
the motor relay, activating the
pump motor, and solenoid
cartridge valve S2, shifting its
spool.
COMPONENTS LOCATED FRONT LEFT OF VEHICLE
5
6
7
8
9
10
11
IGNITION
* REPRESENTATION
OF PRINTED
CIRCUIT BOARD
RED
BLADE MOVEMENT
LEFT RETRACT
WHT
LOCATED AT GRILLE
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
VIO
BRN
WHT/YEL
RED
FASTON
10AFB
#6 RED
#6 RED
MTR RLY
#6 BLK
1
2
3
4
S1 SOLENOID
LT GRN
LT BLU
28
S2 SOLENOID
BLK/WHT
BLU/ORN
S3 SOLENOID
S4 SOLENOID
LT BLU/ORN
S6 SOLENOID
RED
BLK/ORN
#6 RED
1
2
3
4
S5 SOLENOID
#6 BLK
+
M
-
4
LOCATED UNDER DASH
LT BLU/ORN
1
BLU/ORN
2
BLK/WHT
3
LT GRN
4
LT BLU
5
WHT/YEL
6
BRN/RED
7
8
9
BRN/GRN
10
11
12
13
14
BLK/ORN
VIO
BRN
BLK
WHT
3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
12V BATTERY
COIL CORD HARNESS
YEL
1
VIO
2
GRY
3
WHT
4
ORN
5
BLU
6
GRN
7
RED
8
TAN
9
BRN
10
BLK
11
2
BRN
GRY
LEFT SIDE PLOW LAMP
1
No. 21856
PLOW ASSEMBLY
*
ORN/BLK
CONTROL
5) The retracting left cylinder
pushes the hydraulic oil out of its
base end, through solenoid
cartridge valves S4 & S5, through
P/O check valve (C) and back to
the reservoir.
PUMP MOTOR
RIGHT SIDE PLOW LAMP
LOCATED AT VEHICLE FRONT RIGHT
July 1997
LEFT RETRACT – HYDRAULIC
SECONDARY BLOCK ASSY.
SECONDARY
RELIEF VALVE
3000 PSI
RIGHT
PRIMARY BLOCK ASSY.
3500 PSI
PRIMARY
RELIEF
VALVE
S6
P/O CHECK
VALVE
P/O
CHECK
VALVE
(A)
(C)
(D)
S2
P/O
CHECK
VALVE
LEFT
STRAIGHT BLADE
(DEFAULT)
CONTROLLER BUTTON
R/VEE
BLADE
MOVEMENT
MOTOR
SV08-2004
SV08-40
SV08-43
SV08-30
SV08-40
SV08-30
No. 21856
M
S1
S2
S3
S4
S5
S6
29
3500 PSI
S4
S1
SECONDARY
RELIEF VALVE
1750 PSI
3000 PSI
CONTROLLER MODE
ANGLE
RIGHT
ON
L/SCP
WING
R/VEE *
R/VEE *
V / SCOOP
L/SCP *
ANGLE RIGHT
RIGHT LEFT
LEFT
LEFT
RETRACT EXTEND RETRACT EXTEND
ON
ON
ON
ON
ON
L/SCP *
ON
ON
ON
ON
ON
ON
ON
(B)
S3
S5
PRIMARY
RELIEF
VALVE
P/O
CHECK
VALVE
L/SCP
R/VEE
SCOOP
VEE
ON
ON
ON
ALL
ALL
RAISE
LOWER
RAISE
LOWER
ON
ON
ON
ON
ON
PUMP
RELIEF
VALVE
M
LIFT
ON
ON
* NOTE - SEE BLADE MOVEMENT TEXT
FOR BUTTON OPERATION
ON
July 1997
LEFT EXTEND – ELECTRICAL
Blade Movement: Left Extend
Controller Mode: Wing Mode
Controller Button: L/SCP
This button toggles between retract
and extend in wing mode. Upon
entering wing mode, the first
activation of this button and every
other activation thereafter retracts
the wing. The second activation of
this button and every other
activation thereafter extends the
wing.
System Response:
1) By pressing the controller button,
the circuit board within the cab
control completes the ground
path for the electrical circuit.
2) Electrical current flows through
the motor relay, activating the
pump motor, and solenoid
cartridge valves S2 & S4, shifting
both spools.
3) Hydraulic oil from the pump flows
through solenoid cartridge valves
COMPONENTS LOCATED FRONT LEFT OF VEHICLE
5
6
7
8
9
10
11
IGNITION
* REPRESENTATION
OF PRINTED
CIRCUIT BOARD
RED
BLADE MOVEMENT
LEFT EXTEND
WHT
LOCATED AT GRILLE
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
VIO
BRN
RED
FASTON
10AFB
#6 RED
#6 RED
MTR RLY
#6 BLK
1
2
3
4
30
WHT/YEL
S1 SOLENOID
LT GRN
LT BLU
S2 SOLENOID
BLK/WHT
BLU/ORN
S3 SOLENOID
S4 SOLENOID
LT BLU/ORN
S6 SOLENOID
RED
BLK/ORN
#6 RED
1
2
3
4
S5 SOLENOID
#6 BLK
+
M
-
4
LOCATED UNDER DASH
LT BLU/ORN
1
BLU/ORN
2
BLK/WHT
3
LT GRN
4
LT BLU
5
WHT/YEL
6
BRN/RED
7
8
9
BRN/GRN
10
11
12
13
14
BLK/ORN
VIO
BRN
BLK
WHT
3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
12V BATTERY
COIL CORD HARNESS
YEL
1
VIO
2
GRY
3
WHT
4
ORN
5
BLU
6
GRN
7
RED
8
TAN
9
BRN
10
BLK
11
2
BRN
GRY
LEFT SIDE PLOW LAMP
1
No. 21856
PLOW ASSEMBLY
*
ORN/BLK
CONTROL
Even though both sides of the
cylinder piston will experience the
same hydraulic pressure, the
cylinder will extend due to
unequal force. The difference in
area between the base end and
rod end of the cylinder piston
creates a greater force on the
base end which extends the
cylinder. Force = Pressure X
Surface Area.
5) Pressure within the hydraulic
circuit causes P/O check valves
(B) & (C) to
open.
S2 & S3, P/O check valve (A),
solenoid cartridge valve S4 and
into the base end of the left
cylinder causing it to extend.
4) The extending left cylinder
pushes the hydraulic oil out of its
rod end. This oil mixes with the
hydraulic oil from the pump,
passes through solenoid
cartridge valve S4 and into the
base end of the extending left
cylinder. This is called a
regenerative hydraulic circuit.
PUMP MOTOR
RIGHT SIDE PLOW LAMP
LOCATED AT VEHICLE FRONT RIGHT
July 1997
LEFT EXTEND – HYDRAULIC
SECONDARY BLOCK ASSY.
SECONDARY
RELIEF VALVE
3000 PSI
RIGHT
PRIMARY BLOCK ASSY.
3500 PSI
PRIMARY
RELIEF
VALVE
S6
P/O CHECK
VALVE
P/O
CHECK
VALVE
(A)
(C)
(D)
S2
P/O
CHECK
VALVE
LEFT
STRAIGHT BLADE
(DEFAULT)
CONTROLLER BUTTON
R/VEE
L/SCP
ANGLE
RIGHT
ANGLE
LEFT
BLADE
MOVEMENT
MOTOR
SV08-2004
SV08-40
SV08-43
SV08-30
SV08-40
SV08-30
No. 21856
M
S1
S2
S3
S4
S5
S6
S1
ON
ON
R/VEE *
ON
ON
ON
ON
V / SCOOP
L/SCP *
L/SCP *
LEFT
RIGHT
RIGHT
LEFT
RETRACT EXTEND RETRACT EXTEND
ON
1750 PSI
SECONDARY
RELIEF VALVE
WING
R/VEE *
31
3500 PSI
S4
3000 PSI
CONTROLLER MODE
ON
ON
ON
ON
ON
ON
(B)
S3
S5
PRIMARY
RELIEF
VALVE
P/O
CHECK
VALVE
L/SCP
R/VEE
SCOOP
VEE
ON
ON
ON
ALL
ALL
RAISE
LOWER
RAISE
LOWER
ON
ON
ON
ON
ON
PUMP
RELIEF
VALVE
M
LIFT
ON
ON
* NOTE - SEE BLADE MOVEMENT TEXT
FOR BUTTON OPERATION
ON
July 1997
SCOOP – ELECTRICAL
oil from the pump, passes
through solenoid cartridge valve
S6 and into the base end of the
extending right cylinder. This is
called a regenerative hydraulic
circuit. Even though both sides
of the cylinder piston will
experience the same hydraulic
pressure, the cylinder will extend
due to unequal force. The
difference in area between the
base end and rod end of the
cylinder piston creates a greater
shifting the three spools.
3) Hydraulic oil from the pump flows
through solenoid cartridge valve
S2 and into two separate
hydraulic circuits.
4) Half of the oil flows through P/O
check valve (B), solenoid
cartridge valve S6 and into the
base end of the right cylinder
causing it to extend. The
extending right cylinder pushes
the hydraulic oil out of its rod end.
This oil mixes with the hydraulic
1) By pressing the controller button,
the circuit board within the cab
control completes the ground
path for the electrical circuit.
2) Electrical current flows through
the motor relay, activating the
pump motor, and solenoid
cartridge valves S3 & S4 & S6,
COMPONENTS LOCATED FRONT LEFT OF VEHICLE
3
4
5
6
7
8
9
10
11
COIL CORD HARNESS
YEL
1
VIO
2
GRY
3
WHT
4
ORN
5
BLU
6
GRN
7
RED
8
TAN
9
BRN
10
BLK
11
IGNITION
* REPRESENTATION
OF PRINTED
CIRCUIT BOARD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LOCATED UNDER DASH
LT BLU/ORN
1
BLU/ORN
2
BLK/WHT
3
LT GRN
4
LT BLU
5
WHT/YEL
6
BRN/RED
7
8
9
BRN/GRN
10
11
12
13
14
RED
BLADE MOVEMENT
SCOOP
No. 21856
WHT
LOCATED AT GRILLE
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
VIO
BRN
WHT/YEL
LT GRN
LT BLU
BLK/WHT
BLU/ORN
LT BLU/ORN
BLK/ORN
VIO
BRN
BLK
WHT
2
RED
FASTON
10AFB
12V BATTERY
1
BRN
GRY
LEFT SIDE PLOW LAMP
*
ORN/BLK
CONTROL
PLOW ASSEMBLY
#6 RED
#6 RED
MTR RLY
#6 BLK
1
2
3
4
S5 SOLENOID
S6 SOLENOID
RED
BLK/ORN
#6 RED
1
2
3
4
force on the base end which
extends the cylinder. Force =
Pressure X Surface Area.
5) The other half of the oil flows
through solenoid cartridge valve
S3, P/O check valve (A), solenoid
cartridge valve S4 and into the
base end of the left cylinder
causing it to extend. The
extending left cylinder pushes the
hydraulic oil out of its rod end.
This oil mixes with the hydraulic
oil from the pump, passes
through solenoid
cartridge valve S4
and into the base
end of the
extending left
cylinder. This is
S1 SOLENOID
also a regenerative
S2 SOLENOID
hydraulic circuit.
6) Pressure within
S3 SOLENOID
the hydraulic circuit
causes P/O check
S4 SOLENOID
valves (C) & (D) to
open.
#6 BLK
+
M
-
Blade Movement: Scoop
Controller Mode: V / Scoop Mode
Controller Button: L/SCP
System Response:
PUMP MOTOR
RIGHT SIDE PLOW LAMP
LOCATED AT VEHICLE FRONT RIGHT
July 1997
32
SCOOP – HYDRAULIC
SECONDARY BLOCK ASSY.
SECONDARY
RELIEF VALVE
3000 PSI
RIGHT
PRIMARY BLOCK ASSY.
3500 PSI
PRIMARY
RELIEF
VALVE
S6
P/O CHECK
VALVE
P/O
CHECK
VALVE
(A)
(C)
(D)
S2
P/O
CHECK
VALVE
LEFT
CONTROLLER MODE
CONTROLLER BUTTON
BLADE
MOVEMENT
MOTOR
SV08-2004
SV08-40
SV08-43
SV08-30
SV08-40
SV08-30
No. 21856
M
S1
S2
S3
S4
S5
S6
S1
ANGLE
RIGHT
ON
L/SCP
ANGLE
LEFT
ON
WING
R/VEE *
R/VEE *
ON
ON
ON
ON
L/SCP *
V / SCOOP
L/SCP *
LEFT
RIGHT
RIGHT
LEFT
RETRACT EXTEND RETRACT EXTEND
ON
ON
ON
ON
ON
ON
ON
1750 PSI
SECONDARY
RELIEF VALVE
3000 PSI
R/VEE
33
3500 PSI
S4
STRAIGHT BLADE
(DEFAULT)
(B)
S3
S5
PRIMARY
RELIEF
VALVE
P/O
CHECK
VALVE
L/SCP
SCOOP
ON
ON
ON
R/VEE
VEE
ALL
ALL
RAISE
LOWER
RAISE
LOWER
ON
ON
ON
ON
ON
PUMP
RELIEF
VALVE
M
LIFT
ON
ON
* NOTE - SEE BLADE MOVEMENT TEXT
FOR BUTTON OPERATION
ON
July 1997
VEE – ELECTRICAL
Blade Movement: Vee
Controller Mode: V / Scoop Mode
Controller Button: R/VEE
System Response:
1) By pressing the controller button,
the circuit board within the cab
control completes the ground
path for the electrical circuit.
2) Electrical current flows through
the motor relay, activating the
pump motor, and solenoid
cartridge valve S3, shifting its
spool.
3) Hydraulic oil from the pump flows
through solenoid cartridge valve
S2 and into two separate
hydraulic circuits.
4) Half of the oil flows through P/O
check valve (B) and into the rod
end of the right cylinder causing it
to retract.
5) The other half of the oil flows
through solenoid cartridge valve
S3, P/O check valve (A) and into
the rod end of the left cylinder
causing it to retract.
6) Pressure within the hydraulic
circuit causes P/O check valves
(C) & (D) to open.
7) The retracting right cylinder
pushes the hydraulic oil out of its
COMPONENTS LOCATED FRONT LEFT OF VEHICLE
4
5
6
7
8
9
10
11
LOCATED UNDER DASH
LT BLU/ORN
1
BLU/ORN
2
BLK/WHT
3
LT GRN
4
LT BLU
5
WHT/YEL
6
BRN/RED
7
8
9
BRN/GRN
10
11
12
13
14
IGNITION
* REPRESENTATION
OF PRINTED
CIRCUIT BOARD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
RED
BLADE MOVEMENT
VEE
WHT
LOCATED AT GRILLE
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
VIO
BRN
WHT/YEL
RED
FASTON
10AFB
#6 RED
#6 RED
MTR RLY
#6 BLK
1
2
3
4
S1 SOLENOID
LT GRN
LT BLU
34
S2 SOLENOID
BLK/WHT
BLU/ORN
S3 SOLENOID
S4 SOLENOID
LT BLU/ORN
S6 SOLENOID
RED
BLK/ORN
#6 RED
1
2
3
4
S5 SOLENOID
#6 BLK
+
M
-
3
COIL CORD HARNESS
YEL
1
VIO
2
GRY
3
WHT
4
ORN
5
BLU
6
GRN
7
RED
8
TAN
9
BRN
10
BLK
11
BLK/ORN
VIO
BRN
BLK
WHT
2
BRN
GRY
LEFT SIDE PLOW LAMP
12V BATTERY
1
No. 21856
PLOW ASSEMBLY
*
ORN/BLK
CONTROL
base end, through solenoid
cartridge valves S6 & S5, P/O
check valve (D) and back to the
reservoir.
8) The retracting left cylinder
pushes the hydraulic oil out of its
base end, through solenoid
cartridge valves S4 & S5, through
P/O check valve (C) and back to
the reservoir.
PUMP MOTOR
RIGHT SIDE PLOW LAMP
LOCATED AT VEHICLE FRONT RIGHT
July 1997
VEE – HYDRAULIC
SECONDARY BLOCK ASSY.
SECONDARY
RELIEF VALVE
3000 PSI
RIGHT
PRIMARY BLOCK ASSY.
3500 PSI
PRIMARY
RELIEF
VALVE
S6
P/O CHECK
VALVE
P/O
CHECK
VALVE
(A)
(C)
P/O
CHECK
VALVE
(B)
S3
S5
(D)
S2
P/O
CHECK
VALVE
PRIMARY
RELIEF
VALVE
LEFT
STRAIGHT BLADE
(DEFAULT)
CONTROLLER BUTTON
R/VEE
L/SCP
ANGLE
RIGHT
ANGLE
LEFT
MOTOR
SV08-2004
SV08-40
SV08-43
SV08-30
SV08-40
SV08-30
No. 21856
M
S1
S2
S3
S4
S5
S6
3500 PSI
S4
S1
SECONDARY
RELIEF VALVE
1750 PSI
3000 PSI
CONTROLLER MODE
BLADE
MOVEMENT
35
ON
ON
R/VEE *
ON
L/SCP *
L/SCP *
RIGHT
RIGHT
LEFT
LEFT
RETRACT EXTEND RETRACT EXTEND
ON
ON
ON
ON
V / SCOOP
WING
R/VEE *
ON
ON
ON
ON
ON
ON
L/SCP
R/VEE
SCOOP
VEE
ON
ON
ON
ALL
ALL
RAISE
LOWER
RAISE
LOWER
ON
ON
ON
ON
ON
PUMP
RELIEF
VALVE
M
LIFT
ON
ON
* NOTE - SEE BLADE MOVEMENT TEXT
FOR BUTTON OPERATION
ON
July 1997
RAISE – ELECTRICAL
Blade Movement: Raise
Controller Mode: All Modes
Controller Button: Raise
System Response:
1) By pressing the controller button,
the circuit board within the cab
control completes the ground
path for the electrical circuit.
2) Electrical current flows through
the motor relay, activating the
pump motor, and solenoid
cartridge valves S2 & S3, shifting
both spools.
3) Hydraulic oil from the pump flows
through solenoid cartridge valves
S2 & S3, through the internal
check valve in solenoid cartridge
valve S1 into the base end of the
lift cylinder causing it to extend.
COMPONENTS LOCATED FRONT LEFT OF VEHICLE
4
5
6
7
8
9
10
11
IGNITION
* REPRESENTATION
OF PRINTED
CIRCUIT BOARD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LOCATED UNDER DASH
LT BLU/ORN
1
BLU/ORN
2
BLK/WHT
3
LT GRN
4
LT BLU
5
WHT/YEL
6
BRN/RED
7
8
9
BRN/GRN
10
11
12
13
14
RED
BLADE MOVEMENT
RAISE
No. 21856
WHT
LOCATED AT GRILLE
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
VIO
BRN
WHT/YEL
RED
FASTON
10AFB
#6 RED
#6 RED
MTR RLY
#6 BLK
1
2
3
4
S1 SOLENOID
LT GRN
LT BLU
36
S2 SOLENOID
BLK/WHT
BLU/ORN
S3 SOLENOID
S4 SOLENOID
LT BLU/ORN
S6 SOLENOID
RED
BLK/ORN
#6 RED
1
2
3
4
S5 SOLENOID
#6 BLK
+
M
-
3
COIL CORD HARNESS
YEL
1
VIO
2
GRY
3
WHT
4
ORN
5
BLU
6
GRN
7
RED
8
TAN
9
BRN
10
BLK
11
BLK/ORN
VIO
BRN
BLK
WHT
2
12V BATTERY
1
BRN
GRY
LEFT SIDE PLOW LAMP
*
ORN/BLK
CONTROL
PLOW ASSEMBLY
PUMP MOTOR
RIGHT SIDE PLOW LAMP
LOCATED AT VEHICLE FRONT RIGHT
July 1997
RAISE – HYDRAULIC
SECONDARY BLOCK ASSY.
SECONDARY
RELIEF VALVE
3000 PSI
RIGHT
PRIMARY BLOCK ASSY.
3500 PSI
PRIMARY
RELIEF
VALVE
S6
P/O CHECK
VALVE
P/O
CHECK
VALVE
(A)
(C)
P/O
CHECK
VALVE
(B)
S3
S5
(D)
S2
P/O
CHECK
VALVE
PRIMARY
RELIEF
VALVE
LEFT
STRAIGHT BLADE
(DEFAULT)
CONTROLLER BUTTON
R/VEE
L/SCP
ANGLE
RIGHT
ANGLE
LEFT
MOTOR
SV08-2004
SV08-40
SV08-43
SV08-30
SV08-40
SV08-30
No. 21856
M
S1
S2
S3
S4
S5
S6
3500 PSI
S4
S1
SECONDARY
RELIEF VALVE
1750 PSI
3000 PSI
CONTROLLER MODE
BLADE
MOVEMENT
37
ON
ON
R/VEE *
ON
L/SCP *
L/SCP *
LEFT
RIGHT
RIGHT
LEFT
RETRACT EXTEND RETRACT EXTEND
ON
ON
ON
ON
V / SCOOP
WING
R/VEE *
ON
ON
ON
ON
ON
ON
L/SCP
R/VEE
SCOOP
VEE
ON
ON
ON
ALL
ALL
RAISE
LOWER
RAISE
LOWER
ON
ON
ON
ON
ON
PUMP
RELIEF
VALVE
M
LIFT
ON
ON
* NOTE - SEE BLADE MOVEMENT TEXT
FOR BUTTON OPERATION
ON
July 1997
LOWER – ELECTRICAL
Blade Movement: Lower / Float
Controller Mode: All Modes
Controller Button: Lower
System Response:
1) By pressing the controller button,
the circuit board within the cab
control completes the ground
path for the electrical circuit.
2) Electrical current flows through
solenoid cartridge valves S1 & S3
shifting both spools.
3) The weight of the plow forces the
lift cylinder to retract. The
retracting lift cylinder pushes the
hydraulic oil out of its base end,
through solenoid cartridge valves
S1 & S3 & S2, and back to the
reservoir.
COMPONENTS LOCATED FRONT LEFT OF VEHICLE
4
5
6
7
8
9
10
11
IGNITION
* REPRESENTATION
OF PRINTED
CIRCUIT BOARD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LOCATED UNDER DASH
LT BLU/ORN
1
BLU/ORN
2
BLK/WHT
3
LT GRN
4
LT BLU
5
WHT/YEL
6
BRN/RED
7
8
9
BRN/GRN
10
11
12
13
14
RED
BLADE MOVEMENT
LOWER
No. 21856
WHT
LOCATED AT GRILLE
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
VIO
BRN
WHT/YEL
RED
FASTON
10AFB
#6 RED
#6 RED
MTR RLY
#6 BLK
1
2
3
4
S1 SOLENOID
LT GRN
LT BLU
38
S2 SOLENOID
BLK/WHT
BLU/ORN
S3 SOLENOID
S4 SOLENOID
LT BLU/ORN
S6 SOLENOID
RED
BLK/ORN
#6 RED
1
2
3
4
S5 SOLENOID
#6 BLK
+
M
-
3
COIL CORD HARNESS
YEL
1
VIO
2
GRY
3
WHT
4
ORN
5
BLU
6
GRN
7
RED
8
TAN
9
BRN
10
BLK
11
BLK/ORN
VIO
BRN
BLK
WHT
2
12V BATTERY
1
BRN
GRY
LEFT SIDE PLOW LAMP
*
ORN/BLK
CONTROL
PLOW ASSEMBLY
PUMP MOTOR
RIGHT SIDE PLOW LAMP
LOCATED AT VEHICLE FRONT RIGHT
July 1997
LOWER – HYDRAULIC
SECONDARY BLOCK ASSY.
3000 PSI
RIGHT
PRIMARY BLOCK ASSY.
3500 PSI
RELIEF VALVE
SECONDARY
PRIMARY
RELIEF
VALVE
S6
P/O CHECK
VALVE
P/O
CHECK
VALVE
(A)
(C)
P/O
CHECK
VALVE
(B)
S3
S5
(D)
S2
P/O
CHECK
VALVE
PRIMARY
RELIEF
VALVE
LEFT
STRAIGHT BLADE
(DEFAULT)
CONTROLLER BUTTON
R/VEE
L/SCP
ANGLE
RIGHT
ANGLE
LEFT
MOTOR
SV08-2004
SV08-40
SV08-43
SV08-30
SV08-40
SV08-30
No. 21856
M
S1
S2
S3
S4
S5
S6
3500 PSI
S4
S1
SECONDARY
RELIEF VALVE
1750 PSI
3000 PSI
CONTROLLER MODE
BLADE
MOVEMENT
39
ON
ON
R/VEE *
ON
L/SCP *
L/SCP *
RIGHT
RIGHT
LEFT
LEFT
RETRACT EXTEND RETRACT EXTEND
ON
ON
ON
ON
V / SCOOP
WING
R/VEE *
ON
ON
ON
ON
ON
ON
L/SCP
R/VEE
SCOOP
VEE
ON
ON
ON
ALL
ALL
RAISE
LOWER
RAISE
LOWER
ON
ON
ON
ON
ON
PUMP
RELIEF
VALVE
M
LIFT
ON
ON
* NOTE - SEE BLADE MOVEMENT TEXT
FOR BUTTON OPERATION
ON
July 1997
HOLD IN RAISE POSITION – HYDRAULIC
Blade Movement: Hold in Raised
Position
Controller Mode: All Modes
Controller Button: None
System Response:
SECONDARY BLOCK ASSY.
1) Hydraulic oil is trapped in the
base end of the lift cylinder by the
internal check valve in solenoid
cartridge valve S1.
SECONDARY
RELIEF VALVE
3000 PSI
RIGHT
PRIMARY BLOCK ASSY.
3500 PSI
PRIMARY
RELIEF
VALVE
S6
P/O CHECK
VALVE
P/O
CHECK
VALVE
(A)
(C)
(D)
S2
P/O
CHECK
VALVE
LEFT
STRAIGHT BLADE
(DEFAULT)
CONTROLLER BUTTON
R/VEE
L/SCP
ANGLE
RIGHT
ANGLE
LEFT
BLADE
MOVEMENT
MOTOR
SV08-2004
SV08-40
SV08-43
SV08-30
SV08-40
SV08-30
No. 21856
M
S1
S2
S3
S4
S5
S6
S1
SECONDARY
RELIEF VALVE
1750 PSI
ON
ON
WING
R/VEE *
R/VEE *
ON
L/SCP *
RIGHT
RIGHT
LEFT
LEFT
RETRACT EXTEND RETRACT EXTEND
ON
ON
ON
ON
V / SCOOP
L/SCP *
ON
ON
ON
ON
ON
ON
40
3500 PSI
S4
3000 PSI
CONTROLLER MODE
(B)
S3
S5
PRIMARY
RELIEF
VALVE
P/O
CHECK
VALVE
L/SCP
R/VEE
SCOOP
VEE
ON
ON
ON
ALL
ALL
RAISE
LOWER
RAISE
LOWER
ON
ON
ON
ON
ON
PUMP
RELIEF
VALVE
M
LIFT
ON
ON
* NOTE - SEE BLADE MOVEMENT TEXT
FOR BUTTON OPERATION
ON
July 1997
STRIKING AN OBJECT WHILE PLOWING FORWARD – HYDRAULIC
Blade Movement: Striking an Object
While Plowing Forward
Controller Mode: All Modes
Controller Button: None
System Response:
1) Hydraulic oil is trapped in the
base end of the right cylinder by
the right primary relief valve,
right secondary relief valve, and
P/O check valve (D). Hydraulic
oil is trapped in the base end of
the left cylinder by left primary
relief valve, left secondary relief
valve, and P/O check valve (C).
2) When the plow contacts an
object on the front side of the
either wing, the force of the
impact increases the hydraulic
pressure in the base end of the
cylinder. When the pressure
exceeds 3000 psi, the cylinder’s
primary relief valve opens
allowing some of the hydraulic
oil to move from the base end to
rod end of the same cylinder.
3) Due to the unequal
displacement of oil between the
base and rod ends of the
cylinder, hydraulic pressure will
continue to increase. When the
pressure exceeds 3500 psi the
cylinder’s secondary relief valve
opens allowing the remaining
hydraulic oil back to the
reservoir.
No. 21856
SECONDARY BLOCK ASSY.
SECONDARY
RELIEF VALVE
3000 PSI
RIGHT
PRIMARY BLOCK ASSY.
3500 PSI
PRIMARY
RELIEF
VALVE
S6
P/O CHECK
VALVE
P/O
CHECK
VALVE
FORCE APPLIED
WHEN PUSHING
(A)
(C)
STRAIGHT BLADE
(DEFAULT)
CONTROLLER BUTTON
R/VEE
L/SCP
ANGLE
RIGHT
ANGLE
LEFT
M
S1
S2
S3
S4
S5
S6
3500 PSI
S4
S1
SECONDARY
RELIEF VALVE
1750 PSI
3000 PSI
CONTROLLER MODE
MOTOR
SV08-2004
SV08-40
SV08-43
SV08-30
SV08-40
SV08-30
S2
P/O
CHECK
VALVE
FORCE APPLIED
WHEN PUSHING
BLADE
MOVEMENT
41
(D)
LEFT
ON
ON
WING
R/VEE *
R/VEE *
ON
V / SCOOP
L/SCP *
LEFT
RIGHT
RIGHT
LEFT
RETRACT EXTEND RETRACT EXTEND
ON
ON
ON
ON
L/SCP *
ON
ON
ON
ON
ON
ON
(B)
S3
S5
PRIMARY
RELIEF
VALVE
P/O
CHECK
VALVE
L/SCP
R/VEE
SCOOP
VEE
ON
ON
ON
ALL
LOWER
RAISE
LOWER
ON
ON
ON
ON
ON
M
ALL
RAISE
PUMP
RELIEF
VALVE
LIFT
ON
ON
* NOTE - SEE BLADE MOVEMENT TEXT
FOR BUTTON OPERATION
ON
July 1997
STRIKING AN OBJECT WHILE BACK DRAGGING – HYDRAULIC
Blade Movement: Striking an Object
While Back Dragging
Controller Mode: All Modes
Controller Button: None
System Response:
SECONDARY BLOCK ASSY.
1) Hydraulic oil is trapped in the rod
end of the right cylinder by P/O
check valve (B). Hydraulic oil is
trapped in the rod end of the left
cylinder by P/O check valve (A).
The hydraulic system does not
provide pressure relief while
back dragging.
SECONDARY
RELIEF VALVE
3000 PSI
RIGHT
PRIMARY BLOCK ASSY.
3500 PSI
PRIMARY
RELIEF
VALVE
S6
FORCE APPLIED WHEN
BACK DRAGGING
(A)
(C)
(D)
CONTROLLER MODE
CONTROLLER BUTTON
BLADE
MOVEMENT
MOTOR
SV08-2004
SV08-40
SV08-43
SV08-30
SV08-40
SV08-30
No. 21856
M
S1
S2
S3
S4
S5
S6
S2
P/O
CHECK
VALVE
FORCE APPLIED WHEN
BACK DRAGGING
LEFT
STRAIGHT BLADE
(DEFAULT)
L/SCP
S1
SECONDARY
RELIEF VALVE
ANGLE
RIGHT
ANGLE
LEFT
ON
ON
R/VEE *
ON
ON
ON
ON
V / SCOOP
L/SCP *
L/SCP *
RIGHT
RIGHT
LEFT
LEFT
RETRACT EXTEND RETRACT EXTEND
ON
ON
ON
ON
ON
ON
ON
PUMP
RELIEF
VALVE
1750 PSI
WING
R/VEE *
42
3500 PSI
S4
3000 PSI
R/VEE
(B)
S3
S5
PRIMARY
RELIEF
VALVE
P/O
CHECK
VALVE
P/O CHECK
VALVE
P/O
CHECK
VALVE
L/SCP
R/VEE
ALL
ALL
RAISE
LOWER
RAISE
LOWER
SCOOP
VEE
ON
ON
ON
ON
ON
ON
ON
ON
M
LIFT
ON
ON
* NOTE - SEE BLADE MOVEMENT TEXT
FOR BUTTON OPERATION
ON
July 1997
HEADLAMPS – VEHICLE ONLY
COMPONENTS LOCATED FRONT LEFT OF VEHICLE
LOW
HIGH
YEL
ORN
GRN
RED
BLK (HIGH)
GRY
LOW BEAM
HIGH BEAM
*
4
5
6
7
8
9
10
11
T
TO PARK LAMP
M BULLET
P
IGNITION
* REPRESENTATION
OF PRINTED
CIRCUIT BOARD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TURN SIG
RED
Note: Both high beam and low
beam are shown
BRN
WHT
LOCATED AT GRILLE
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
VIO
BRN
GRY
LOCATED UNDER DASH
LT BLU/ORN
1
BLU/ORN
2
BLK/WHT
3
LT GRN
4
LT BLU
5
WHT/YEL
6
BRN/RED
7
8
9
BRN/GRN
10
11
12
13
14
RED
FASTON
10AFB
#6 RED
#6 RED
MTR RLY
#6 BLK
LOCATED AT VEHICLE FRONT RIGHT
1
2
3
4
1
2
3
4
TURN SIG
T
TO RIGHT TURN SIG
M BULLET
WHT/YEL
S1 SOLENOID
LT GRN
LT BLU
S2 SOLENOID
BLK/WHT
BLU/ORN
43
S3 SOLENOID
S4 SOLENOID
LT BLU/ORN
BLK/ORN
VIO
BRN
BLK
WHT
3
COIL CORD HARNESS
YEL
1
VIO
2
GRY
3
WHT
4
ORN
5
BLU
6
GRN
7
RED
8
TAN
9
BRN
10
BLK
11
12V BATTERY
2
TO LEFT TURN SIG
M BULLET
BLK/ORN
ORN/BLK
1
H
1
1
2
2
L
3
3
CON3 CON3
HEADLIGHT
P
TO
HEADLAMP
HARNESS
ORN (LOW)
BLK
CONTROL
LEFT SIDE PLOW LAMP
BLU (GND)
S5 SOLENOID
S6 SOLENOID
RED
BLK/ORN
#6 RED
+
M
-
BLU
GND
TO VEHICLE
HEADLIGHT CONNECTOR
PLOW ASSEMBLY
PUMP MOTOR
#6 BLK
RIGHT SIDE PLOW LAMP
H
1
1
2
2
L
3
3
CON3 CON3
HEADLIGHT
P
T
P
TURN SIG
T
TURN SIG
No. 21856
July 1997
HIGH BEAM HEADLAMPS WITH PLOW CONNECTED TO VEHICLE
COMPONENTS LOCATED FRONT LEFT OF VEHICLE
LOW
HIGH
YEL
ORN
GRN
RED
BLK (HIGH)
GRY
LOW BEAM
HIGH BEAM
*
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TO PARK LAMP
M BULLET
P
RED
BRN
WHT
LOCATED AT GRILLE
TURN SIG
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
VIO
BRN
RED
FASTON
10AFB
#6 RED
#6 RED
MTR RLY
#6 BLK
LOCATED AT VEHICLE FRONT RIGHT
1
2
3
4
1
2
3
4
TURN SIG
T
TO RIGHT TURN SIG
M BULLET
GRY
LOCATED UNDER DASH
LT BLU/ORN
1
BLU/ORN
2
BLK/WHT
3
LT GRN
4
LT BLU
5
WHT/YEL
6
BRN/RED
7
8
9
BRN/GRN
10
11
12
13
14
IGNITION
* REPRESENTATION
OF PRINTED
CIRCUIT BOARD
T
WHT/YEL
S1 SOLENOID
LT GRN
LT BLU
S2 SOLENOID
BLK/WHT
BLU/ORN
44
S3 SOLENOID
S4 SOLENOID
LT BLU/ORN
BLK/ORN
VIO
BRN
BLK
WHT
3
COIL CORD HARNESS
YEL
1
VIO
2
GRY
3
WHT
4
ORN
5
BLU
6
GRN
7
RED
8
TAN
9
BRN
10
BLK
11
12V BATTERY
2
TO LEFT TURN SIG
M BULLET
BLK/ORN
ORN/BLK
1
H
1
1
2
2
L
3
3
CON3 CON3
HEADLIGHT
P
TO
HEADLAMP
HARNESS
ORN (LOW)
BLK
CONTROL
LEFT SIDE PLOW LAMP
BLU (GND)
S5 SOLENOID
S6 SOLENOID
RED
BLK/ORN
#6 RED
+
M
-
BLU
GND
TO VEHICLE
HEADLIGHT CONNECTOR
PLOW ASSEMBLY
PUMP MOTOR
#6 BLK
RIGHT SIDE PLOW LAMP
H
1
1
2
2
L
3
3
CON3 CON3
HEADLIGHT
P
T
P
TURN SIG
T
TURN SIG
No. 21856
July 1997
LOW BEAM HEADLAMPS WITH PLOW CONNECTED TO VEHICLE
COMPONENTS LOCATED FRONT LEFT OF VEHICLE
LOW
HIGH
YEL
ORN
GRN
RED
BLK (HIGH)
GRY
LOW BEAM
HIGH BEAM
*
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TO PARK LAMP
M BULLET
P
RED
BRN
WHT
LOCATED AT GRILLE
TURN SIG
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
VIO
BRN
RED
FASTON
10AFB
#6 RED
#6 RED
MTR RLY
#6 BLK
LOCATED AT VEHICLE FRONT RIGHT
1
2
3
4
1
2
3
4
TURN SIG
T
TO RIGHT TURN SIG
M BULLET
GRY
LOCATED UNDER DASH
LT BLU/ORN
1
BLU/ORN
2
BLK/WHT
3
LT GRN
4
LT BLU
5
WHT/YEL
6
BRN/RED
7
8
9
BRN/GRN
10
11
12
13
14
IGNITION
* REPRESENTATION
OF PRINTED
CIRCUIT BOARD
T
WHT/YEL
S1 SOLENOID
LT GRN
LT BLU
S2 SOLENOID
BLK/WHT
BLU/ORN
45
S3 SOLENOID
S4 SOLENOID
LT BLU/ORN
BLK/ORN
VIO
BRN
BLK
WHT
3
COIL CORD HARNESS
YEL
1
VIO
2
GRY
3
WHT
4
ORN
5
BLU
6
GRN
7
RED
8
TAN
9
BRN
10
BLK
11
12V BATTERY
2
TO LEFT TURN SIG
M BULLET
BLK/ORN
ORN/BLK
1
H
1
1
2
2
L
3
3
CON3 CON3
HEADLIGHT
P
TO
HEADLAMP
HARNESS
ORN (LOW)
BLK
CONTROL
LEFT SIDE PLOW LAMP
BLU (GND)
S5 SOLENOID
S6 SOLENOID
RED
BLK/ORN
#6 RED
+
M
-
BLU
GND
TO VEHICLE
HEADLIGHT CONNECTOR
PLOW ASSEMBLY
PUMP MOTOR
#6 BLK
RIGHT SIDE PLOW LAMP
H
1
1
2
2
L
3
3
CON3 CON3
HEADLIGHT
P
T
P
TURN SIG
T
TURN SIG
No. 21856
July 1997
TROUBLESHOOTING GUIDE
Troubleshooting Guide Contents
Introduction
General Diagnostic Table ............... 47
Packing Nut Adjustment ................ 50
Motor Test ...................................... 51
Motor and Motor Relay Test
Diagram ......................................... 52
Motor Relay Test ............................ 53
Vehicle Harness Test –
Motor Relay ................................... 54
Control Test ................................... 55
Pump Pressure Test ...................... 56
Solenoid Coil Activation Test .......... 57
Vehicle Harness Test –
Solenoid Coils ................................ 59
Hydraulic System Test ................... 60
Relief Valve Inspection and
Adjustment .................................... 63
Pilot Operated Check Valve
Inspection ...................................... 64
Individual Solenoid Coil Test .......... 64
Solenoid Cartridge Valve
Inspection ...................................... 65
Vehicle Headlamp Test .................. 66
Headlamp Test Diagram ................ 67
Plow Headlamp Test ...................... 68
Park/Turn Lamp Test ..................... 69
This guide consists of a series of
tables, diagrams, flow charts and
other information. When used
properly it will assist the mechanic in
identifying and repairing faulty system
components. Fisher highly
recommends the use of the
EZ-V™ Electrical Tester as a
timesaving option for electrical
system diagnosis. When using this
tester, refer to the supplied instruction
manual for proper use of the tester.
Any malfunction of the EZ-V
snowplow can be categorized as
either mechanical, electrical or
hydraulic. Mechanical issues are
generally related to the blade wings,
A-frame, lift frame and mount
components and are usually identified
by visual inspection. Electrical and
hydraulic issues can be difficult to
trace to the component level and that
is the purpose of this troubleshooting
guide. Read and understand the
Theory of Operation before
attempting troubleshooting.
How to Use the Troubleshooting
Guide
Because of the relative complexity of
the EZ-V snowplow electrical and
hydraulic systems, many variables
need to be eliminated in order to
obtain workable test procedures.
These variables translate into
conditions listed before the tables or
flow charts and must be satisfied
before proceeding.
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 will solve the
problem.
1. Go to the General Diagnostic
Table and satisfy the ten listed
conditions. These conditions
must be met before proceeding
into the table or to any
subsequent test.
2. Locate the condition in the table
which best describes the problem
and check possible causes and
actions in the order listed.
3. Proceed to a service procedure,
another condition, or a specific
No. 21856
test as directed. All tests except
the Hydraulic System Test use a
flow chart format. To use these
flow charts, first satisfy any listed
conditions at the top of the page.
Then begin at the upper left
square and proceed as directed.
4. Follow along sequentially through
the table and tests, referring to
the hydraulic and electrical
schematics in the Theory of
Operation section and the
component Identification and
Location diagrams. Eventually
the problem will be pinpointed at
the component level.
Electrical Testing
Read and understand the section
describing electrical circuit operation
in the Theory of Operation section. A
simple 12V test light with a ground
lead can be used for circuit testing.
When directed to check for 12 volts
(12V), ground the test lamp lead and
probe the terminal. When asked to
check for ground, attach the test lamp
lead to +12V and probe the terminal.
Note that 12V is a nominal value. If
using a voltmeter, actual voltage will
vary with the vehicle and presence of
loads in tested circuits.
July 1997
46
GENERAL DIAGNOSTIC TABLE
Before using this General Diagnostic Table, or performing any tests, you must verify the
following conditions:
1. Snowplow is attached to vehicle
and all harnesses are connected.
CAUTION
2. Harness connector pins and
terminals are free of corrosion
and coated with dielectric grease,
insuring good connections.
Do not mix different types of
hydraulic fluid. Some fluids are
not compatible and may cause
performance problems and
product damage.
3. Vehicle battery and charging
system are in good condition and
battery connections are clean
and tight.
4. Hydraulic reservoir is filled to filler
plug level with recommended
fluid, when plow is in "vee"
position and lift cylinder is fully
14-Pin Connector
3
7
11
14
No. 21856
1
4
8
12
Wire Color
Light Blue With Orange Stripe
Blue With Orange Stripe
Black With White Stripe
Light Green
Light Blue
White With Yellow Stripe
Brown With Red Stripe
Red
Orange With Black Stripe
Brown With Green Stripe
retracted. See Product
Specifications.
5. There are no oil leaks from
hoses, fittings, cylinders or the
hydraulic unit.
6. All built up snow and ice is
removed from the snowplow.
7. Vehicle harness wires are
correctly installed in the 14 pin
connector, located in the cab.
8. 10 amp fuse in vehicle harness is
good.
9. Ignition is turned on or engine is
running.
10. The control is connected in the
cab and turned on.
Note: Do not use a straight blade
control with the adapter cable for
these tests.
Pin No.
1
2
3
4
5
6
7
8
9
10
July 1997
47
GENERAL DIAGNOSTIC TABLE
CONDITION
POSSIBLE CAUSE
ACTION
Motor does not run for any requested function.
Poor connections in vehicle or snowplow battery
cables.
Motor worn or damaged or pump seized.
Motor relay inoperative.
Fault in vehicle wiring harness.
Faulty controller.
Clean and re-establish connections.
Motor runs continuously.
Motor relay sticking or always energized.
Fault in vehicle harness wiring.
Faulty controller.
Go to Motor Relay Test.
Go to Vehicle Harness Test - Motor Relay.
Go to Control Test.
Snowplow won’t raise—motor runs.
Lift ram packing nut too tight.
Clogged pump filter (all functions are affected).
Worn or damaged pump.
Solenoid valve coils not energizing properly.
Hydraulic system malfunction.
Adjust lift ram packing nut.
Clean or replace filter, flush reservoir.
Go to Pump Pressure Test.
Go to Solenoid Coil Activation Test.
Go to Hydraulic System Test.
Snowplow raises slowly or partially—motor runs.
Lift ram packing nut too tight.
Clogged pump filter (all functions are affected).
Worn or damaged pump.
Adjust lift ram packing nut.
Clean or replace filter, flush reservoir.
Go to Pump Pressure Test.
In straight blade mode, snowplow angles slowly or
Air in angle cylinders.
Relief valves damaged or out of adjustment.
Pump filter clogged (all functions are affected).
Worn or damaged pump.
Solenoid valve coils not activating properly.
Hydraulic system malfunction.
Angle cylinders damaged or bypassing internally.
Cycle wings stop to stop to remove air.
Go to Relief Valve Inspection and Adjustment.
Clean or replace filter, flush reservoir.
Go to Pump Pressure Test.
Go to Solenoid Coil Activation Test.
Go to Hydraulic System Test.
Rebuild or replace angle cylinder.
Snowplow will not lower or lowers slowly, or won’t
float.
Lift cylinder packing nut too tight.
Solenoid valve coils not activating properly.
Hydraulic system malfunction.
Adjust lift cylinder packing nut.
Go to Solenoid Coil Activation Test.
Go to Hydraulic System Test.
Snowplow lowers by itself or won’t stay in raised
position.
Solenoid valve coils not activating properly.
Hydraulic system malfunction.
Go to Solenoid Coil Activation Test.
Go to Hydraulic System Test.
partially
-orIn wing mode, wings move slowly or partially—motor
runs.
No. 21856
Go to Motor Test.
Go to Motor Relay Test.
Go to Vehicle Harness Test - Motor Relay.
Go to Control Test.
48
July 1997
GENERAL DIAGNOSTIC TABLE
CONDITION
POSSIBLE CAUSE
ACTION
Wings will not lock hydraulically or hold position.
Air in angle cylinders.
Relief valves damaged or out of adjustment.
P/O check valve stuck open
Solenoid coils not activating properly.
Hydraulic system malfunction.
Angle cylinders damaged or leaking internally.
Cycle wings stop to stop to remove air.
Go to Relief Valve Inspection & Adjustment.
Go to P/O Check Valve Inspection.
Go to Solenoid Coil Activation Test.
Go to Hydraulic System Test.
Repair or replace angle cylinders.
Plow does not perform the selected function or
performs a different function.
Hydraulic hose routing incorrect.
Verify correct hose installation. See Hose Routing
Diagram.
Go to Solenoid Coil Activation Test.
Go to Hydraulic System Test.
Solenoid valve coils not energizing properly.
Hydraulic system malfunction.
Vehicle harness 10 amp fuse blows.
Red wire in plow harness going to solenoid valve coils
is shorted to ground.
Red wire in vehicle harness going to terminal 3 of the
vehicle battery connector is shorted to ground.
Red wire from fuse to terminal 8 of the 14-pin
connector is shorted to ground.
Brown/green wire in vehicle harness going to motor
relay primary is shorted to ground.
Control fault.
Go to Control Test.
Control F1 fuse blows.
Motor relay primary shorted internally.
Solenoid valve coil S1, S2 or S3 shorted internally.
Replace motor relay.
Go to Individual Coil Test.
Control F2 fuse blows.
Solenoid valve coil S4, S5 or S6 shorted internally.
Go to Individual Coil Test.
Vehicle accessory fuse blows.
Circuit overloaded.
Consult vehicle owner’s manual for correct
application of aftermarket electrical loads.
Excessive load on vehicle electrical system
while using snowplow.
Lift cylinder packing nut too tight.
Worn or damaged motor or pump.
Adjust lift cylinder packing nut.
Go to Pump Pressure Test.
Snowplow headlamps operate irregularly or not at all – Burnt out bulbs or corroded sockets.
snowplow attached.
Wires improperly connected to relays.
-orVehicle headlamps operate irregularly or not at all –
Relays inoperative.
snowplow removed.
No. 21856
Repair wire or replace plow harness.
Repair wire or replace harness.
49
Repair wire or replace harness.
Repair wire or replace harness.
Replace bulbs, clean contacts.
Review and correct wire installation. See
Headlamp Test Diagram.
Go to Plow Headlamp Test or Vehicle Headlamp
Test.
July 1997
GENERAL DIAGNOSTIC TABLE
CONDITION
POSSIBLE CAUSE
ACTION
Vehicle daytime running lamps (DRLs) do not work –
snowplow removed.
Parking brake on.
Power in DRL circuit has been interrupted.
Fully release parking brake.
Turn lamp and/or ignition switch on and off to cycle
the DRL circuitry.
Repair vehicle electrical system.
No output from DRL module.
PACKING NUT ADJUSTMENT
Note: This adjustment applies to
the lift cylinder only. Angle
cylinders use gland nuts which
are torqued to specifications.
Periodically verify the lift cylinder
packing nut is tight. If the packing nut
is loose or leakage appears when
raising the plow, tighten the packing
nut 1/4 turn maximum after you feel
the packing nut contact the packing.
No. 21856
50
CAUTION
Do not overtighten the packing
nut. Over-tightening affects the
operation and life of the
packing.
Packings not used for a period of
time may show signs of oil weep.
This should stop after use.
Note: A small amount of leakage
is necessary to properly lubricate
the rod.
July 1997
MOTOR TEST
WARNING
The driver shall keep
bystanders clear of the blade
during this test. Do not stand
between the vehicle and the
blade. During this test the right
wing will retract. A moving or
falling blade could cause
personal injury.
Momentarily attach jumper cables
from the battery to respective (+)
(-) motor terminals. Does motor
run?
Refer to the Motor and Motor Relay
Test Diagram.
YES
Retest with jumper cable from
battery (+) to (+) motor
terminal. Does motor run?
NO
NO
Repair or replace motor or
pump.
No. 21856
YES
Momentarily attach (+)
jumper cable between battery
and motor side of motor relay
secondary. Does motor run?
YES
Go to Motor
Relay Test.
NO
Repair ground (black) wire in
vehicle or plow battery cable
harness.
Repair positive (red) wire in
vehicle or plow battery cable
harness.
July 1997
51
MOTOR AND MOTOR RELAY TEST DIAGRAM
Motor Terminal
(-)
Motor Terminal
(+)
Faston Connector
Small Red Wire
(Male)
Large Red Wire
Small Red Wire
(Female)
(+)
Large Black
Wire
Motor Relay
Secondary
Terminals
(-)
Black\Orange
Wire
Small
Red Wire
Large
Red
Wire
To Vehicle
Harness
Large Black
Wire
52
Large
Red Wire
Motor Relay
Primary Terminals
Vehicle Battery Harness
Brown/Green Wire
Plow Battery Harness
No. 21856
Brown/Red Wire
July 1997
MOTOR RELAY TEST
WARNING
The driver shall keep
bystanders clear of the blade
during this test. Do not stand
between the vehicle and the
blade. During this test the right
wing will retract. A moving or
falling blade could cause
personal injury.
1. Perform motor test first to verify
battery cables, motor and pump
are good.
2. Refer to the Motor and Motor
Relay Test Diagram.
Motor does not run:
Attach a jumper cable across
the motor relay secondary
terminals.
Does motor run?
YES
Is there 12V at motor
relay primary terminal
with brown/green wire?
NO
NO
YES
Attach a ground jumper wire
from battery (-)
to relay primary terminal with
brown/red wire.
Does motor run?
YES
Go to Vehicle Harness
Test - Motor Relay.
53
NO
Repair or replace (+) cable
from battery to motor relay.
Go to Vehicle Harness
Test - Motor Relay.
Replace motor relay.
Motor runs continuously:
Disconnect control in cab.
Does motor continue to run?
YES
Replace motor relay.
NO
Go to Vehicle Harness
Test - Motor Relay.
No. 21856
July 1997
VEHICLE HARNESS TEST - MOTOR RELAY
WARNING
The driver shall keep
bystanders clear of the blade
during this test. Do not stand
between the vehicle and the
blade. During this test the right
wing will retract. A moving or
falling blade could cause
personal injury.
YES
Is there 12V at pin #8?
NO
Verify vehicle power
source and 10a fuse in red
wire. Repair red wire or
replace harness.
No. 21856
1. Perform the Motor Test and
Motor Relay Test first.
2. Disconnect the control in the cab.
3. Refer to the 14-pin Connector
diagram. Test the vehicle side of
the connector in the cab as
follows.
Install a jumper wire
between pins #8 and
#10. Does motor run?
YES
Brown/red wire to
motor relay is shorted
to ground. Repair wire.
NO
14-Pin Connector
3
7
11
14
1
4
8
12
Is there 12V at motor relay YES
Is there 12V at pin #7?
primary terminal with
brown/green wire?
NO
Brown/green wire to motor
relay is open. Repair wire
or replace harness.
YES
Remove jumper
wire. Go to Control
Test.
NO
Brown/red wire is open.
Repair wire or replace
harness.
July 1997
54
CONTROL TEST
CAUTION
Printed circuit board (PCB) is
subject to damage from static
electricity. Follow instructions
below to safely handle PCB.
To safely handle PCB:
1. Place control on its side and
remove top half of handle,
leaving the PCB in lower half.
2. Remove PCB from housing by
only touching the edges of the
PCB.
3. Touch a clean finger to metal part
of fuse "F2".
4. PCB is now safe to handle as
long as contact with it is
maintained.
Test Procedure
1. Disconnect the control in the cab
and remove to bench.
2. Remove control handle half to
access internal components.
3. Refer to diagram for fuse location.
F2
Note: Fuse F1 is for motor relay,
S1, S2 and S3 solenoid coils.
Fuse F2 is for S4, S5 and S6
solenoid coils.
Remove and test F1 with ohmmeter.
Is F1 good?
NO
Replace F1. Go to condition “Control
F1 Fuse Blows” in General
Diagnostic Table.
F1
FUSES
55
Remove and test F2 with ohmmeter.
Is F2 good?
NO
Replace F2. Go to condition “Control
F2 Fuse Blows” in General
Diagnostic Table.
YES
Replace control or proceed by carefully
disconnecting the white coil cord connector
from the PC board. Test the coil cord harness
for continuity between the connectors
according to the electrical schematic. Note
internal connections in the harness. Does
continuity match schematic?
YES
Replace PC board
No. 21856
NO
Replace coil cord
harness.
July 1997
PUMP PRESSURE TEST
1. Install a tee in-line with the lift
cylinder hydraulic hose and
attach a 3000 psi pressure
gauge.
Is pump relief pressure
1750 ± 100 psi?
NO
2. Raise the snowplow fully, hold the
raise button and read the pump
relief pressure.
3. Refer to Relief Valve
Identification and Location for
valve location.
NO
NO
Is the pressure
zero?
YES
YES
Adjust pump relief
clockwise1/4 turn to
increase pressure. Did
pressure change?
YES
Inspect pump relief
valve for damaged
components or
contamination. Is
pump relief valve OK?
NO
Go to Relief Valve
Inspection and
Adjustment.
YES
Is motor amp draw
greater than 190 amps at
pump relief?
YES
Repair or
replace motor
No. 21856
NO
Go to
Hydraulic
System Test
Go to Solenoid Coil
Activation test
56
Adjust to 1750 ± 100 psi.
Remove pump.
Is pump O-ring
damaged?
NO
Replace pump.
YES
Replace pump
o-ring. Reassemble
and adjust pressure
July 1997
SOLENOID COIL ACTIVATION TEST
1. Disconnect the red (+) battery
cable from the motor and isolate
it.
2. Remove the two lift arm pivot
pins from the headgear. Place
the lift arm and lift cylinder
against the A-frame. This will
allow access to the solenoid
valve covers. Remove the
solenoid cartridge covers.
3. Verify wires are properly attached
to solenoid coils. Refer to table
below, Electrical Schematic and
Solenoid Cartridge Valve
Identification and Location.
Solenoid Coil
12-PIN GRILL CONNECTOR PIN #
14-PIN CONNECTOR PIN #
WIRE COLOR
ANGLE RIGHT
ANGLE LEFT
RIGHT RETRACT *
RIGHT EXTEND *
LEFT RETRACT *
LEFT EXTEND *
SCOOP
VEE
RAISE
LOWER
4. Activate the control for each
function and check for magnetic
pull at all six solenoid valve coils.
Only the coils designated as
"ON" in the table below should
activate for each function. After
noting which coils are energized,
proceed to the flow chart.
5. Reassemble the headgear and lift
arm after the test is complete.
S1
S2
S3
S4
S5
S6
1
4
3
7
8
12
6
5
4
3
2
1
WHITE/ YELLOW LIGHT LIGHT BLACK/
BLUE/
LT BLUE/
BLUE GREEN WHITE ORANGE ORANGE
ON
ON
ON
57
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
*Coils activate on every other hit of the button in wing mode,
beginnning with retract when wing mode is first entered.
No. 21856
July 1997
SOLENOID COIL ACTIVATION TEST
Do activated coils match the
chart for all functions?
NO
YES
Is there 12v at all six red wires
attached to coils?
NO
YES
Disconnect 3-pin battery cable
harnesses at grill. Is there 12v at the
small pin #3 of the vehicle battery
harness?
NO
Go to Vehicle
Harness Test Solenoid Coils.
YES
Go to Hydraulic System Test.
Disconnect 12-pin harness
connectors at grill. Are any
coils activated?
YES
The wire between activated coil
and 12-pin connector in plow
harness is shorted to ground.
Repair wire.
No. 21856
Repair small red wire in plow battery
harness or plow harness.
NO
Is there 12v at each of pins
#1,3,4,7,8 and 12 of the plow
harness 12-pin connector?
NO
Corresponding wire or solenoid coil is
open. Go to Individual Coil Test.
Repair open wire or replace plow
harness.
58
YES
Go to Vehicle Harness Test Solenoid Coils
July 1997
VEHICLE HARNESS TEST — SOLENOID COILS
1. Perform solenoid coil activation
test first.
2. Disconnect the red (+) battery
cable from the motor and isolate
it.
3. Connect all harness connectors
at the grill.
4. Refer to the 14-pin Connector
diagram for pin location.
14-Pin Connector
3
1
7
4
8
12
11
14
Disconnect the control in the
cab. Are any solenoid coils
activated? (Check for
magnetic pull)
NO
Is there 12v at each of pins
#1,2,3,4,5 & 6 of 14-pin
connector on vehicle harness?
NO
Is there 12v at any of
pins #1,2,3,4,5 & 6?
NO
YES
YES
For pins which do not have
12v, corresponding wire in
vehicle harness is open.
Repair wire or replace
harness.
YES
Is there ground at pin #9 of 14
pin connector?
Corresponding wire in vehicle
harness is shorted to ground.
Repair wire.
YES
NO
Disconnect the Faston spade
connector which connects the
vehicle harness red wire to the
small red wire in the vehicle battery
cable. Is there 12v at the vehicle
harness (female) side?
NO
10 amp fuse is blown or
red wire in vehicle
harness is open.
Replace fuse, repair wire
or replace harness.
YES
Go to Control Test.
No. 21856
Orange/black wire in
vehicle harness is open.
Repair wire or replace
harness.
Small red wire in vehicle battery
cable is open. Repair wire or
replace vehicle battery cable.
July 1997
59
HYDRAULIC SYSTEM TEST
This test consists of trying all the plow
functions and comparing the plow
reaction to the action requested in the
following table. The table will pinpoint
faulty solenoid valves or closed p/o
check valves accurately if only one
component is malfunctioning. If the
plow reaction for a given function is
not listed in the table, there may be
relief or p/o check valves which are
stuck open or contaminated, missing
or damaged o-rings or backing rings
on solenoid, relief or p/o check
valves, or there may be two or more
faulty components. In this case, use
the specific function hydraulic
schematic and carefully inspect each
component in the flow circuit. If
contamination is evident in more than
one component, the hydraulic unit,
hoses and cylinders must be
completely disassembled, inspected
and cleaned.
1. Perform Solenoid Coil Activation
Test first.
2. Verify hydraulic hose installation
is correct. Refer to the Hose
Routing diagram.
3. Test all of the plow functions.
4. Inspect and clean or replace the
suspected component. Refer to
the Hydraulic Unit Parts Diagram.
5. Refer to the sections following
the table for inspection and
adjustment of solenoid, cartridge
valves, p/o check valves and
relief valves.
IMPORTANT: When testing the plow
functions, be sure the control is not in
“float.”
ACTION REQUESTED
PLOW REACTION
POSSIBLE CAUSE
Angle Right
•
Angle Left
⇒ S2 stuck shifted
•
None
⇒ S3 stuck shifted
60
⇒ Check valve B closed
⇒ Check valve A closed
Angle Left
•
Right Extend
⇒ S6 stuck shifted
•
Right Retract
⇒ S5 not shifted
•
None
⇒ S4 stuck shifted
•
Angle Right
⇒ S2 not shifted
•
Raise
⇒ S3 stuck shifted
•
None
⇒ Check valve A closed
⇒ Check valve B closed
No. 21856
•
Left Extend
⇒ S4 stuck shifted
•
Left Retract
⇒ S5 not shifted
•
None
⇒ S6 stuck shifted
July 1997
HYDRAULIC SYSTEM TEST
ACTION REQUESTED
PLOW REACTION
POSSIBLE CAUSE
Right Retract
•
Left Retract
⇒ S2 stuck shifted
•
Vee
⇒ S3 stuck shifted
•
None
⇒ Check valve B closed
⇒ Check valve D closed
Right Extend
Left Retract
•
Right Extend
⇒ S6 stuck shifted
•
Angle Right
⇒ S5 stuck shifted
•
Left Retract
⇒ S2 stuck shifted
•
Right Extend and Left Retract—wings not locked
⇒ S3 stuck shifted
•
None
⇒ Check valve B closed
•
Right Retract
⇒ S6 not shifted
•
Right Retract
⇒ S2 not shifted
•
Raise
⇒ S3 stuck shifted
•
None
⇒ Check valve A closed
61
⇒ Check valve C closed
Left Extend
No. 21856
•
Left Extend
⇒ S4 stuck shifted
•
Angle Left
⇒ S5 stuck shifted
•
Right Retract
⇒ S2 not shifted
•
Raise
⇒ S3 stuck shifted
•
None
⇒ Check valve A closed
•
Left Retract
⇒ S4 not shifted
July 1997
HYDRAULIC SYSTEM TEST
ACTION REQUESTED
PLOW REACTION
POSSIBLE CAUSE
Scoop
•
Raise
⇒ S2 stuck shifted
•
Right Extend—left wing floats
⇒ S3 not shifted
•
Right Extend
⇒ Check valve A closed
•
Left Extend
⇒ Check valve B closed
•
Right Extend and Left Retract—wings not locked
⇒ S4 not shifted
•
Left Extend
⇒ S6 not shifted
•
Raise
⇒ S2 stuck shifted
•
Right Retract
⇒ S3 not shifted
Vee
⇒ Check valve A closed
⇒ Check valve C closed
62
•
Left Retract
⇒ Check valve B closed
•
Left Extend and Right Retract—wings not locked
⇒ S4 stuck shifted
•
Left Retract
⇒ Check valve D closed
•
None
⇒ S5 stuck shifted
•
Left Retract and Right Extend—wings not locked
⇒ S6 stuck shifted
•
Vee
⇒ S2 not shifted
•
Left Retract
⇒ S3 not shifted
•
Raises very slowly
⇒ S1 stuck shifted
Hold Raised
•
Lower
⇒ S1 stuck shifted or has faulty internal check valve
Lower
•
Lowers very slowly
⇒ S2 stuck shifted
•
None
⇒ S3 not shifted
Raise
⇒ S1 not shifted
No. 21856
July 1997
RELIEF VALVE INSPECTION AND ADJUSTMENT
Relief Valve Inspection
Adjustment
Relief Valve
1. Remove the valve stem, ball,
spacer and spring.
2. Look for broken or damaged
parts, contamination or missing
or damaged O-rings.
3. If OK, place ball on hard wood
block, hold stem seat on ball and
lightly strike stem with a hammer.
1. Adjust by tightening the relief
valve stem as much as possible
(until spring is fully compressed)
2. Back off valve stem (rotate
counterclockwise) the number of
turns indicated in the chart.
Pump Relief
Right or Left Cylinder
Primary Relief
Right or Left Cylinder
Secondary Relief
*
CAUTION
Be careful to strike stem
squarely. You can bend stem if
you do not strike it squarely.
No. of Turns Backed Off
(CCW) From Fully Seated
2-1/2 - 2-3/4*
1-1/2 - 1-3/4**
Approximate
Relief Valve
Pressure (PSI)
1750
3000
1-1/4 - 1-1/2
3500
Install a tee in line with the lift
cylinder hydraulic hose and attach a
3000 psi gauge. Read the pressure
at pump relief when holding the raise
function button. Adjust pump relief
valve to obtain 1750+/- 100 psi.
**
Be certain the cylinder primary relief
valve stem is backed out 1/4 turn
farther than the secondary relief
valve stem.
63
4. Reassemble components into
manifold block. Apply a light coat
of anti-seize or grease to stem
threads.
Spring
Spring Spacer
Ball
Valve Stem w/ O-rings
No. 21856
July 1997
PILOT OPERATED CHECK VALVE INSPECTION
1. Remove check valve assembly
from manifold block. Using
miniature needle nosed pliers,
remove the spool from the bore.
2. Using a plastic, aluminum or soft
brass probe, push on the ball in
the end of the check valve. It
should move freely, then return to
the closed position. If
the ball sticks open or
closed or binds,
replace the check
valve assembly.
Clean, repair or
replace as necessary.
Be sure replacement
service p/o check
valve assemblies have
P/O Check
the letter ”V” stamped Valve
on the hex. Inspect
the spool for signs of
wear or any damage
indicating it is not
shifting. Look for worn
or damaged O-rings
and repair or replace
as necessary.
No. 21856
3. Re-oil all O-rings and reinstall the
spool by holding the stem with
the miniature needle nosed pliers
and carefully inserting it fully into
the bore. Install the check valve
assembly and torque to 120 in-lb.
INDIVIDUAL SOLENOID COIL TEST
1. Remove both wires from coil
terminals.
2. Attach an ohmmeter across the
coil terminals.
3. A reading of approximately 7 ohms
indicates the coil is OK.
Note: A good coil will draw
approximately 1.5 amps.
Check Valve
Assembly
64
O-ring
Spool
Back-up ring
O-ring
July 1997
SOLENOID CARTRIDGE VALVE INSPECTION
Note: S3, the SV08-43 cartridge
valve is identical to the S2 and S5
SV08-40 cartridge valves in
physical appearance. These two
valves function differently
internally and cannot be
interchanged. The only way to
tell them apart is by looking for
the stamping “SV08-43” or “SV0840” on the side of the hex.
1. Remove coils from cartridge
valves and remove cartridge
valves from manifold. Look for
visible contamination or damaged
seals. Check for stuck spools
with a plastic, aluminum, or soft
brass probe by pushing on the
spring loaded internal spool from
the end of the valve. The spool
should move freely through its
entire travel.
Note: Using probe to move spool
may shear contamination which
was affecting spool movement.
2. Bench test the cartridge valve by
installing a coil on the stem and
applying 12V. Watch through the
side ports for internal spool
travel.
Note: If contamination is seen in
more than one component, it can
be reasonably assumed that the
entire system is contaminated
and in order to perform a proper
repair, the entire hydraulic unit
must be disassembled and
cleaned. The hoses and cylinders
must also be disassembled and
cleaned.
If the cartridge valve spool is
stuck or its travel is restricted,
replace the cartridge. If the
cartridge valve appears OK,
clean it with parts cleaning
solvent and dry with compressed
air, being careful not to damage
the seals. Check the spool travel
again in case any internal
contaminants were dislodged
during cleaning.
Re-oil the
cartridge valve
seals and o-rings
APPLY 12V TO COIL
and reinstall the
cartridge valve,
torquing to 10 ftlb. Install the
CARTRIDGE VALVE
coils and torque
MARKED ON HEX
retaining nuts to
4-5 ft-lb.
65
WATCH HERE
PROBE HERE
No. 21856
July 1997
VEHICLE HEADLAMP TEST
1. Verify correct wire installation to
relays. See the Headlamp Test
Diagram.
2. Turn ignition and headlight switch
on.
At each relay, is there 12v at
terminal 30 with green (high
beam) or yellow (low beam)
wires?
3. Disconnect all harnesses at the
grill.
4. All bulbs must be good.
YES
Apply 12v to relay terminal
87a with red (high beam) or
orange (low beam) wires. Do
vehicle headlamps
come on?
NO
YES
Check vehicle output from
headlight connector to plug-in
harness. Repair vehicle
system or open wires in plugin harness.
Black/orange wire in vehicle
harness is shorted to ground.
Repair wire.
Unplug plug-in harness
connectors at each vehicle
headlamp. Is there 12v at
the red wire (high beam) and
orange wire (low beam)?
NO
Red or orange wires
open in plug-in
harness. Repair wire
or replace harness.
YES
Remove 12v jumper from
terminal 87a. Disconnect the
black/orange wire from
terminal 85 of both relays.
Do vehicle headlamps come
on?
YES
No. 21856
NO
66
Blue ground wire in plugin harness is open.
Repair wire or replace
harness.
NO
Replace relay
July 1997
HEADLAMP TEST DIAGRAM
Existing Passenger-Side
Headlamp Connector
Existing Vehicle
Wire Harness
Plug-In Harness
Headlamp Relay Wiring Diagram
Low Beam Headlamp Relay
Existing Driver-Side
Headlamp Connector
Black
87
Plug-In Harness
Male Plug
86
Purple
87a
85
Black/
Orange
Brown
30
Plug-In Harness
Headlamp Connectors
Orange
Yellow
Yellow
High Beam Headlamp Relay
Orange
Green
White
87
Red
Purple
Purple
Vehicle
Harness
Black/
Orange
Passenger-Side
Turn Signal
Low Beam
Headlamp Relay
High Beam
Headlamp
Relay
Purple
86
87a
Brown
30
85
Black/
Orange
Red
Green
White
Black
Driver-Side
Turn Signal
Gray
Brown
Alternate Right Turn Signal
Connection Behind
Driver-Side Headlamp
Bullet Receptacle
Connector (Black)
Parking
No. 21856
July 1997
67
PLOW HEADLAMP TEST
1. Verify correct wire installation to
the headlamp relays
2. All bulbs must be good.
3. Connect all harnesses at the grill.
4. Turn vehicle headlamp switch on.
For vehicles with Daytime
Running Lamps (DRLs), turn
At each headlamp relay, is
there 12v at terminal 30 with
green (high beam) or yellow
(low beam) wires?
YES
ignition on. DRL equipped
vehicles have a pink wire instead
of a brown wire on relay terminal
86.
5. Refer to the Electrical Schematic,
Headlamp Test diagram and 12Pin Connector diagram.
Apply (+) 12v to relay terminal 87
with white (high beam) or black
(low beam) wires. Do plow
headlamps work?
NO
YES
Check vehicle output from
headlamp connector to plug-in
harness. Repair vehicle
electrical system or open wires
in plug-in harness.
Is there 12v at each relay
terminal 86 with brown or (DRL)
pink wire?
NO
YES
Low Beam
Headlamp
Check brown wire connection to
vehicle park lamp circuit or
(DRL) pink wire connection to
vehicle accessory wire or
fusebox. Repair or replace
open (DRL) pink or brown wire.
Replace headlamp relay.
With (+) 12v applied at
terminal 87, is there 12v at the
black or white wires in the
plow headlamp connectors at
the bulb?
NO
3
4
Disconnect 12-pin grill connector.
Is there 12v at terminal #6 (high
beam, white wire) or terminal #2
(low beam, black wire) on vehicle
side?
Remove jumper wire from relay.
Disconnect 12-pin grill connector.
Attach ground jumper wire to
terminal #5 on vehicle side. Is there
12v at terminal #6 (high beam) or
terminal #2 (low beam)?
NO
5
6
12
7
YES
NO
Black/orange ground wire in
vehicle harness is open.
Repair wire or replace harness.
No. 21856
2
8
9
10
Left Turn
Right Turn
Attach a ground jumper wire to relay
terminal 85 with black/orange wire. YES
Do plow lights come on?
NO
1
12-Pin
Connector
High Beam
Headlamp
Ground
NO
YES
YES
11
Park
Black/orange ground
wire in plow harness is
open. Repair wire or
replace harness.
Corresponding wire is
open in vehicle harness.
Repair wire or replace
harness.
68
Corresponding wire is
open in plow harness.
Repair wire or replace
harness.
Reconnect 12-pin grill
connector. Attach
ground jumper to (-)
motor terminal. Do plow
lights come on?
NO
Black/orange wire in
plow harness is open.
Repair wire or replace
harness.
YES
Poor ground between
battery and motor (-)
terminal. Repair vehicle
or plow (-) battery cable.
July 1997
PARK/TURN LAMP TEST
1. Verify plow park/turn (P/T) bulbs
and contacts are good.
2. Turn parking lamps and ignition
on.
3. Connect all harnesses at the grill.
4. Refer to the 12-Pin Connector
diagram.
Low Beam
Headlamp
1
12-Pin
Connector
2
3
YES
7
NO
Reconnect 12-pin grill
YES
connector. Remove p/t bulbs
from plow lights. Is there 12v
at each brown wire terminal in
the sockets?
Disconnect 12-pin grill connector. YES
Is there 12v at terminal #11 on
the vehicle side?
NO
Poor connection to vehicle circuit or
open brown wire in vehicle harness.
Repair wire or replace vehicle
harness.
YES
Disconnect 12-pin grill connector. Is
there 12v at terminals #10 for right
turn and #9 for left turn?
NO
NO
Repair vehicle electrical
system.
No. 21856
5
6
8
9
10
11
Park
Black/orange ground wire
is open in plow harness.
Repair wire or replace
harness.
NO
Repair vehicle electrical
system.
Do vehicle turn signals
work?
4
12
Left Turn
Right Turn
Do vehicle park lamps
work?
High Beam
Headlamp
Ground
Poor connection to vehicle circuit or
open purple (right) or gray (left) wire in
vehicle harness. Repair wire or replace
harness.
69
Brown wire is open in plow
harness. Repair wire or replace
harness.
YES
Reconnect 12-pin grill connector.
Remove p/t bulbs from plow lights.
Is there 12v at each red wire
terminal in the sockets? (The
purple and gray wires are spliced
to red wires in the p/t sockets.)
YES
Black/orange ground wire is
open in plow harness.
Repair wire or replace
harness.
NO
Purple or gray wire is open in plow
harness. Repair wire or replace
harness.
July 1997
REMOVABLE SPRING TOOL
To Replace A Spring On The Blade, Follow The Instructions
Below.
spring bar in between the tabs on
the rod. Insert the 1/2 x 1-1/2"
Gr. 5 cap screw through the
outside tab, through the hole in
the spring bar, and tighten into
the threaded hole.
CAUTION
Servicing the trip springs
without special tools and
knowledge could result in
personal injury. See your
authorized Fisher outlet for
service.
1. Insert the threaded rod in through
the hole in the channel weldment.
Be sure the threaded hole in the
tab on the rod is nearest to the
channel.
3. Drop the 1/2" flat washer Gr. 8
over the threaded rod and fasten
the nut to the threaded rod.
Tighten the nut until the spring
bar is raised enough to insert the
pin through the pin hole. Center
the pin within the hole.
2. Place the assembly on to the top
anchor above the spring as
illustrated. Be sure to place the
5. Remove the spring from the
blade by removing the bolt from
the bottom of the spring bar.
6. Insert the new spring
with the spring bar up
through the top anchor
on the blade. Fasten the
bottom of the spring bar
to the anchor on the trip
edge with the previously
removed fasteners.
Tighten.
70
1/4 x 1-1/4" Pin
7. Repeat steps 1 and 2 above.
1/2" Flat Washer Gr. 8
Channel
1/2 x 1-1/2"
Cap Screw Gr. 5
4. Loosen the nut to lower the
spring bar. Remove the spring
tool assembly by removing the
1/2" cap screw.
1/2" Nut
8. Repeat step 3 above, except
remove the pin from the
spring bar.
9. Repeat step
4 above.
Rod
No. 21856
July 1997
Fisher Engineering
P.O. Box 529
Rockland, ME 04841
Copyright © 1997 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
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 herein. Fisher Engineering and the vehicle manufacturer may require and/or recommend optional equipment for snow removal. This product is
manufactured under the following patents: 4,280,062, 4,999,935, 5,353,530, and 5,420,480 and other patents pending. Fisher Engineering offers a one-year limited warranty on
all snowplows and accessories. See separately printed page for this important information. The following are registered® and unregistered™ trademarks of Douglas Dynamics,
L.L.C.: FISHER®, EZ-V™
Printed in USA
July 1997
No. 21856
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