TS Guide.cdr
SNOWPLOWS
DIAGNOSTIC
TROUBLESHOOTING
GUIDE
Introduction
The Curtis Snowplow family of products are built and tested for lasting performance. All snowplows are fully tested for
electrical, hydraulic and lighting malfunctions prior to shipping. Any malfunction is corrected immediately at our facility to ensure that
our customers receive a quality product that will last for years to come. As with any piece of equipment, rough service and harsh
environments can lead to poor performance, necessitating repairs.
When diagnosing snowplow malfunctions, it is important to methodically separate and test the different systems that are
utilized on the Curtis Sno-Pro series snowplows. The approach detailed below will greatly reduce diagnostic time and take the guess
work out of troubleshooting. What this means is lower associated labor, fewer unnecessary parts and more satisfied customers.
The following pages contain the hydraulic circuit as well as the electrical system. Each diagram shows a specific function, and what
actually happens when a function is activated. This information will be useful in helping to understand what to look for when
troubleshooting a snowplow malfunction. Each page, both electrical and hydraulic, has a “What Happens” heading at the top of the
page. This will offer a step by step sequence of what takes place internally in the snowplow system once the controller is activated.
This will act as a guide of what to look for as a possible cause of a malfunction.
Sno-Pro 3000/Home-Pro Troubleshooting Guide
Table of Contents
Reference Section:
Hydraulic Manifold Symbols...............................................................Page: 1
Electrical System Symbols.................................................................Page: 2
Hydraulic Manifold Circuit.................................................................. Page: 3
Electrical Plug Pin-Outs......................................................................Page: 4
Electrical Pin-Outs Cont’d.................................................................. Page: 5
Hydraulic Manifold Parts Breakdown................................................ Page: 6
Electric/Hydraulic Power Unit Parts Breakdown.............................. Page: 7
Notice & Warnings:.................................................................... Page: 8
Diagnostic Method:....................................................................Pages: 9-11
Function Guide Section:
Angle Left Electrical............................................................................ Page: 12
Angle Left Hydraulic............................................................................Page: 13
Angle Right Electrical..........................................................................Page: 14
Angle Right Hydraulic......................................................................... Page: 15
Plow Lift Electrical...............................................................................Page: 16
Automatic Jack Retract Electrical......................................................Page: 16
Plow Lift Hydraulic...............................................................................Page: 17
Plow Float Electrical............................................................................Page: 18
Plow Float Hydraulic............................................................................Page: 19
Jack Extend Electrical.........................................................................Page: 20
Jack Extend Hydraulic.........................................................................Page: 21
Jack Retract W/ Jack Switch Electrical..............................................Page: 22
Jack Retract W/ Jack Switch Hydraulic.............................................Page: 23
Trouble Shooting Guide By Problem
Trouble Shooting Guide Index............................................................Pages: 24-35
Warranty Information................................................................ Pages: 36, 37
SNO-PRO 3000 & HOME-PRO: MANIFOLD SYMBOLS
Cross-Over Relief Valve
Usage: Angle Circuits
2/2 Way Solenoid Valve
Usage: 1TBM2 Plow Float
1TBM2a Jack Retract
Flow Restrictor
Usage: Lift & Jack Circuit
Filter Screen
Usage: All Circuits
Check Valve
Usage: Lift Circuit
P
Pressure Supply
From Power Unit
¾ Way Solenoid Valve
W/ Open Center
Usage: 1TBM1 Angle Valve
SNOWPLOWS
¾ Way Solenoid Valve
W/ Tandem Center
Usage: 1TBM7
Plow Lift/Jack Extend Valve
T
Fluid Return To
Reservoir
SNO-PRO 3000 & HOME-PRO: ELECTRICAL SYMBOLS & DIAGRAMS
15a Fuse
Diode
Pump Motor
Solenoid
Curtis Part#:
1TBP61A
Lift/Float Switch
Chassis
Ground
Switch Panel Control Kit
Curtis Part #: 1TBP60A
Headlight Switch
A-Frame
Jack Switch
Curtis Part #:
1TBP100
Angle Switch
Note: Lift/Float Switch, Angle Switch & A-Frame
Jack Switch all have bridged center terminals
conducting power to both poles of the switch.
+
Vehicle Battery
Electric/Hydraulic Power Unit
With Manifold Block
Ground Stud
Plow Light Switch
Curtis Part#:
1TBP48A
SNOWPLOWS
Jack
Extend
Plow
Lift
Plow
Float
Power Stud
Jack
Retract
Angle
Right
Angle
Left
SNO-PRO 3000 & HOME-PRO: MANIFOLD CIRCUIT
“B” Port
Left Cylinder
“A” Port
Right Cylinder
“X” Port
Jack Cylinder
“H” Port
Lift Cylinder
Cross-Over Relief
For Left Cylinder
Jack Retract
Valve: 1TBM2A
Plow Float
Valve: 1TBM2
Cross-Over Relief
For Right Cylinder
Plow Lift/Jack Extend
Valve: 1TBM7
Angle Valve: 1TBM1
P
Pressure Supply
From Power Unit
SNOWPLOWS
T
Fluid Return To
Reservoir
SNO-PRO 3000 & HOME-PRO: ELECTRICAL PLUG PIN-OUTS
Single Plug Harness
Vehicle Side Harness
CURTIS PLUG (90-2010-00)
( LG/B
( Y/B
PIN #
1
(1)
2
3
4
5
6
7
8
9
10
11
12
13
14
=
YELLOW / BLACK )
COLOR
FUNCTION
BLACK
GROUND
ORANGE
GROUND
12 VDC
(+)
RED
GREEN
FLOAT
RED
LIFT
BLUE
LEFT SOLENOID
WHITE
RIGHT SOLENOID
BROWN PUMP SOLENOID
WHITE/RED LIGHT COMMON
LG/B
LOW BEAM
Y/B
HIGH BEAM
PARK / RUN
GRAY
VIOLET
LEFT TURN
PINK
RIGHT TURN
NA
NA
3
4
5
1
9
12
= LT GREEN / BLACK )
13
6
14
7
2
10
8
AWG
4
18
4
18
18
18
18
16
16
16
16
18
18
18
NA
END VIEW
LOOKING AT
CONNECTOR
11
15
SNOWPLOWS
Single Plug Harness
Plow Side Harness
CURTIS PLUG (90-2011-00)
( LG/B
= LT GREEN / BLACK )
( Y/B
=
YELLOW / BLACK )
PIN #
1
(1)
2
3
4
5
6
7
8
9
10
11
12
13
14
15
COLOR
FUNCTION
BLACK
GROUND
ORANGE
GROUND
12 VDC
(+)
RED
GREEN
FLOAT
RED
LIFT
BLUE
LEFT SOLENOID
WHITE
RIGHT SOLENOID
BROWN PUMP SOLENOID
WHITE/RED LIGHT COMMON
LG/B
LOW BEAM
Y/B
HIGH BEAM
PARK / RUN
GRAY
VIOLET
LEFT TURN
PINK
RIGHT TURN
NA
NA
NA
NA
END VIEW
LOOKING AT
CONNECTOR
AWG
4
16
4
18
18
18
18
16
16
16
16
18
18
18
NA
NA
Double Plug Harness
Control Plug
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
COLOR
FUNCTION
ORANGE
GROUND
GREEN
FLOAT
RED
LIFT
BLUE
LEFT SOLENOID
NONE
WHITE
RIGHT SOLENOID
BROWN
PUMP SOLENOID
WHITE/RED LIGHT COMMON
GRN/BLK
LOW BEAM
NONE
YEL/BLK
HIGH BEAM
PARK / RUN
GRAY
VIOLET
LEFT TURN
PINK
RIGHT TURN
NONE
AWG
16
18
18
18
18
16
16
16
16
16
18
18
Plow Side Vehicle Side
8
7
11
6
2
5
1
10
15
4
14
3
11
6
1
1
6
11
12
7
2
2
7
12
13
8
3
3
8
13
14
9
4
4
9
14
15
10
5
5
10
15
9
13
12
SNO-PRO 3000 & HOME-PRO: ELECTRICAL CONNECTIONS
Vehicle Side Harness
Headlight Adapter Connectors
In-Cab Control Plug
"MOLEX" FREE HANGING RECEPTACLE
.093 (9) PIN POWER CONNECTOR
P/N 03-09-1094
WITH "MOLEX" FEMALE TERMINAL
P/N 02-09-1117
PIN #
1
2
3
4
5
6
7
8
9
COLOR
BLACK
BLUE
WHITE
RED
GREEN
BROWN
ORANGE
NA
NA
FUNCTION
12v +
LEFT
RIGHT
LIFT
FLOAT
PUMP SOLENOID
GROUND NA
NA
END VIEW
LOOKING AT
CONNECTOR
1 2 3
4 5 6
7 8 9
B
A= WHT/RED
B= YEL
C= LT GRN
D= YEL/RED
E= GRN/RED
A D
E C
COMMON
HIGH BEAM FEED
LOW BEAM FEED
HIGH BEAM
LOW BEAM
Plow Side Harness
Headlight Connector
.180 BULLET TERM.
M = MALE
F = FEMALE
IN-CAB HEADLIGHT SWITCH CONNECTIONS
GREEN
LOW BEAM FEED
YELLOW
HIGH BEAM FEED
GREEN/BLACK
LOW BEAM PLOW
YELLOW/BLACK
HIGH BEAM PLOW
GREEN/RED
LOW BEAM VEHICLE
YELLOW/RED
HIGH BEAM VEHICLE
SNOWPLOWS
END VIEW
LOOKING AT
CONNECTOR
A
B
C
D
E
F
=
=
=
=
=
=
M
M
F
F
VEHICLE
VEHICLE
F
F
COMMON
(WHITE/RED)
NOT USED
TURN (PINK) OR (VOLET)
RUN
(GRAY)
LOW BEAM
(L GREEN/BLACK)
HIGH BEAM
(YELLOW/BLACK)
E
C
A
VEHICLE
F
D
B
SNO-PRO 3000 & HOME-PRO: HYDRAULIC MANIFOLD
Plow Float
Jack Hose
Lift Hose
SNOWPLOWS
Lift/Jack Extend
Jack Retract
Angle Left/Right
6
Left Angle Hose
Right Angle Hose
Schem.
Ref #
Item
Part #
Cross-Port
Relief
Recommend
Dealer Stock
Description
Qty/
Unit
1
1TBP59AP2
Manifold Block Complete With Valves & Coils
1
2
1TBM1
*
3/4 WAY SOLENOID VALVE (ANGLE LEFT/RIGHT)
1
3
1TBM7
*
2/2 WAY SOLENOID VALVE (PLOW LIFT)
1
4
1TBM2
*
2/2 WAY SOLENOID VALVE (PLOW FLOAT)
1
5
1TBM4
*
12 VDC COIL
6
6
1TBM2A
*
2/2 WAY SOLENOID VALVE (JACK RETRACT)
1
SNO-PRO 3000 & HOME-PRO: HYDRAULIC POWER UNIT
Schem. Item
Ref #
Part #
Recommend
Dealer Stock
Description
Qty/
Unit
Sno-Pro Hydraulic Power Unit Parts Breakdown
N/S
1
Schem. Item
Ref #
Part #
Recommend
Dealer Stock
Description
Qty/
Unit
KTI Hydraulic Power Unit Parts Breakdown
N/S
1TBP59AP1V
ELEC/HYD POWER UNIT W/O MANIFOLD
1
DC MOTOR 12V
1
1TBM13A
Gear Pump
1
3
1TBM12A
Motor to Pump Coupling
1
4
1TBM35
5/16" x 3" Pump Mounting Bolts
2
5
1TBM36
3/8" NPT Plastic Elbow
1
6
1TBM20
*
3/8" NPT Inlet Strainer
1
7
1TBM37
*
Cartridge Relief Valve
1
8
1TBM23A
*
Steel Reservoir
1
9
1TBM11A
*
Reservoir O-Ring
1
10
1TBM21
*
Collector Magnet
1
11
1TBM38
1/4" NPT Adapter
1
12
1TBM39
1/2" ID Clear Plastic Tubing
1
1
1TBM8A
2
*
SNOWPLOWS
1TBP59AP1
1TBM8
*
ELEC/HYD POWER UNIT W/O MANIFOLD
1
DC MOTOR 12V
1
2
1TBM9
VALVE PLUG
1
3
1TBM10
VALVE PLUMBING PLUG
1
4
1TBM11
RESERVOIR O-RING
1
5
1TBM12
COUPLING
1
6
1TBM13
PUMP ASSEMBLY
1
7
1TBM14
PUMP O-RING KIT
1
8
1TBM15
WASHER FLAT
1
9
1TBM16
PUMP MOUNTING BOLT
2
10
1TBM17
BOLT - SUCTION COVER 5/16"
1
11
1TBM18
SCREW TAPTITE M6 X 12mm
1
12
1TBM19
PLUMBING ASSEMBLY INLET
1
13
1TBM20
*
FILTER
1
14
1TBM21
*
COLLECTOR MAGNET
1
15
1TBM22
RESERVOIR SCREW
4
16
1TBM23V
*
RESERVOIR
1
17
1TBP63A
*
EXTERNAL RESERVOIR BREATHER CAP
1
N/S
18
1TBP63B
*
INTERNAL RESERVOIR BREATHER CAP
1
1TBM25
FIXED RELIEF VALVE ASSEMBLY
1
19
1TBM26
RETURN TUBE
1
20
1TBM27
COMPRESSION NUT
1
21
1TBM28
COMPRESSION SLEEVE
1
22
1TBM29
SUCTION COVER
1
*
Sno-Pro 3000/Home-Pro Troubleshooting Guide
NOTICE
Know your own abilities and mechanical skills. Some procedures in the following troubleshooting guide require a
considerable mechanical aptitude. Use discretion and refer to an authorized Curtis dealer when needed.
The following guide has been developed to provide a step-by-step approach to troubleshooting operational problems with
your Sno-Pro/Home-Pro 3000 Snow Plow.
Many functional problems may be solved by first following this general checklist.
>Remove the filler cap on the pump and verify the reservoir is full of oil.
>
Check for external leaking and tighten any loose hoses, fittings, or plugs. Damaged hoses must be replaced
immediately.
>Check the condition of the fuse, replace if necessary.
>Check the harness plug connector at the front of the vehicle and verify a good connection.
>Check the wire connectors at the switch panel control or joystick control and verify the wire leads are secure.
>Check the battery and solenoid connections under the hood of the vehicle and verify a good connection and ground.
>Remove the A-frame cover and verify a good ground connection.
If functional problems persist after following the general checklist, locate the description of the problem you are
experiencing in the troubleshooting guide glossary and follow the course of action detailed under the specific problem.
Suggested Test Equipment:
An analog, 8-range multimeter, which can measure DC voltage up to 20 volts, is preferred for any of the tests described in
this guide.
Most tests can be performed using a 12vdc-test light and/or continuity tester.
A 3,000-psi oil filled pressure gauge will be needed for some of the hydraulic test procedures.
SNOWPLOWS
Diagnostic Method - Find The Problem...Fast!
System #1: Vehicle Electrical System:
Related Components:
Vehicle Side Wiring Harness
Battery Lead #4 Gauge
Motor Solenoid
In-Cab Control
Headlight Switch
Headlight Adapter
The starting point for this method is the vehicle side electrical system. The chart below details all of the plug pinouts for the vehicle side harness. To test the vehicle side harness, remove the plow from the vehicle and
disconnect the in-cab control. Plug in the control extension cord provided in this kit between the in-cab control and
the vehicle harness. The control extension cord will enable the mechanic to operate and test the plow functions at
the vehicle harness plug.
The very first step in this process is to verify a PROPER INSTALLATION i.e. In-cab control plugged in and turned
on, all wires connected correctly, good ground connections etc...
Testing Plow Functions: Using the diagram below and the test light supplied in this kit, activate each function and
test the corresponding pin in the harness plug for power. For Lift, Left Angle & Right Angle functions, the pin for
each function AND the pin for the pump solenoid should be powered at the same time. Activating the pump
solenoid will also power the 12vdc Hi-Amp pin (#2). When testing the float function, only that pin will be powered.
For testing headlight and directional functions, it will be necessary to turn each function on inside the cab.
IIf all pins test correctly, the vehicle harness system has been eliminated as the cause of the malfunction.
If one or more pins do not test correctly, determine which device is connected at the other end of the harness.
For function problems, test the in-cab controls. To do this, attach the test light alligator clip to ground and insert the
probe of the test light into the colored wire on the in-cab control that corresponds with the function that is being
tested. Activate the function and test for power. Through the process of elimination the in-cab control will be
determined faulty or in good working order.
If all functions test correctly but no power is being sent to the 12vdc Hi-Amp (pin #2), test the brown wire at the pump
solenoid. To do this, activate each function (Lift, Left & Right) and test the brown wire connection at the solenoid with
the test light. If no power is present, the harness may be faulty.
If power is present but the solenoid is not operating, double check the battery cable connections as well as the
mounting surface. The pump solenoid grounds through the mounting bracket and must have a rust-free, metallic
surface to mount to. If the above has been checked, the solenoid is faulty. If the solenoid is transferring voltage from
one terminal to the other when activated, the solenoid is working properly and there may be an internal malfunction in
the harness.
Testing Plow Light System: For Lighting problems, test the plow light switch first. Turn the vehicle headlights on.
Locate the plow headlight switch and test each wire for power depending on the position of the switch. If the switch
toggles between vehicle and plow lights properly, disconnect the headlight adapters on side at a time and test the gray
packard connectors for power. See the diagram below for details. If all of the functions test properly, the vehicle
harness is in proper working order. Otherwise, there is an internal malfunction in the harness.
If, after performing the above test procedures, the vehicle harness is working properly, remove the A-frame cover from
the plow and plug the plow harness into the vehicle harness. It is not necessary to re-attach the plow to the vehicle as
this reduces the work area. It may be necessary, however, to remove the harness P-clamp from the Lift Frame
Upright and remove the wire ties holding the headlight pigtails. This will increase the available harness length.
Diagnostic Method - Find The Problem...Fast!
System #2: Plow Electrical System
Related Components:
Plow Side Wiring Harness
12vdc Valve Coils
Plow Lights
12vdc Pump Motor
The next step in the testing procedure is to determine if the plow side harness is working properly.
Testing Plow Functions:
WARNING: DISCONNECT THE POSITIVE BATTERY CABLE FROM THE BATTERY SIDE OF THE PUMP MOTOR
SOLENOID BEFORE TESTING THE PLOW SIDE HARNESS. IF THIS IS NOT DONE, THE PLOW MAY MOVE
ERRATICALLY DURING THIS TEST. FAILURE TO DO SO MAY RESULT IN SERIOUS INJURY OR DEATH.
Testing Plow Functions: Disconnect the packard connector for the function to be tested. The table below indicates
the color code for each function. Connect the alligator clip of the test light to a ground source (the stud on the back of
the pump assembly). Insert the test probe into the colored side of the packard connector (the orange wire side is used
for a ground connection) and activate the function. Remember, Lift, Left Angle & Right Angle functions also activate
the pump motor (brown wire) simultaneously. If the packard connector is receiving power when the function is
activated, the plow side harness is working properly.
Testing Plow Light System: For headlight testing on the plow, disconnect the plow light pigtail from the harness and,
using the table below, test for light functions, i.e. Hi-Beam, Lo-Beam, Common, Parking Lights and Directional lights. If
the functions are receiving voltage the plow harness is working properly and there may be a malfunction within the plow
headlight assembly. If the functions are not receiving voltage, there may be an internal malfunction in the plow side
harness.
Testing 12vdc Valve Coils: Leave the battery side of the pump motor solenoid disconnected from the battery.
Remove the 12vdc coil from the valve for the function to be tested. Insert the probe of the test light through the hole in
the coil. Activate the function using the in-cab control. A magnetic draw from the coil should pull the test probe when
energized. If no draw is present, the coil may be faulty.
If the 12vdc valve coils are working properly, the function problem is most likely a hydraulic problem.
Diagnostic Method - Find The Problem...Fast!
System #3: Snowplow Hydraulic System
Related Components:
Electric/Hydraulic Power Unit
Hydraulic Manifold
After it has been determined that both the vehicle side and plow side harnesses are in proper working order, the next
step will be to troubleshoot the hydraulic system, with particular attention to the manifold.
The main function of the hydraulic manifold is to direct fluid to the appropriate cylinder to perform a task.
For Example: when the in-cab control is moved to the “Plow Lift” function, the pump motor spins the pump developing
pressure. This pressure enters the manifold. The manifold’s internal plumbing is configured in such a way that if no
valve is opened, the fluid will return to the reservoir on the electric/hydraulic power unit. Activating the “Plow Lift”
function not only engages the pump but also shifts the “Plow Lift/Jack Extend” valve to the “Plow Lift” position. The
pressurized fluid will follow the path of least resistance, in this case, the opened “Plow Lift” passageway. The fluid then
exits the manifold through the “Lift” hose attached to the “H” port on the manifold and the 7 ½” Lift Cylinder at the other
end. Pressurized fluid extends the Lift Cylinder raising the plow. Read through the following pages for detailed
hydraulic and electrical circuit information.
ANGLE LEFT FUNCTION - ELECTRICAL
What Happens:
A) Ignition “On” energizes the controller power source sending 12vdc into the controller . If equipped with a Joystick or
Touch Pad, the Controller power switch must be in the “On” position.
B) Moving the controller to “Angle Left” position energizes the Blue “Angle Left” Wire and the Brown “Solenoid” Wire.
C) The Brown “Solenoid” Wire closes the solenoid contacts and sends 12vdc power to the pump motor.
D) The Blue “Angle Left” Wire sends 12vdc power to the Angle Left Valve Coil.
E) See Next Page For Hydraulic Flow Chart
B)
15a Fuse
-
+
C)
Vehicle Battery
Headlight Switch
Must Be Ignition Switched
Angle Switch
Switch Panel Control
Viewed From Behind
Lift/Float Switch
Source
A) 12vdc
Black wire
Solenoid Control
Brown Wire
Chassis Ground
Continuous Connection
12vdc Switched
By Solenoid
D)
Angle Left
Blue Wire
Ground
C)
Power
SNOWPLOWS
Ground Connection
Internal In Plow Side
Harness
ANGLE LEFT FUNCTION - HYDRAULIC
E)
“A” Port
Right Cylinder
What Happens:
A) Left Angle Function is Activated
With Controller
B) Brown Wire Activates Motor Solenoid
C) 12vdc Motor Spins Pump Developing
Pressure
D) Blue Wire Shifts “Angle Valve” to
Angle Left Position
E) Pump Pressure is Supplied to “A” Port
Extending Right Angle Cylinder.
F) As Plow Angles to the Left, Fluid
from the Left Angle Cylinder returns
to the Reservoir
F)
“B” Port
Left Cylinder
“X” Port
Jack Cylinder
“H” Port
Lift Cylinder
Cross-Over Relief
For Left Cylinder
Cross-Over Relief
For Right Cylinder
Jack Retract
Valve: 1TBM2A
Plow Float
Valve: 1TBM2
D) Angle Valve: 1TBM1
Plow Lift/Jack Extend
Valve: 1TBM7
P
C) Pressure Supply
From Power Unit
T
F) Fluid Return To
Reservoir
Pressure Side
Fluid Supply
Fluid Return
To Reservoir
SNOWPLOWS
ANGLE RIGHT FUNCTION - ELECTRICAL
What Happens:
A) Ignition “On” energizes the controller power source sending 12vdc into the controller . If equipped with a Joystick or
Touch Pad, the Controller power switch must be in the “On” position.
B) Moving the controller to “Angle Right” position energizes the White “Angle Right” Wire and the Brown “Solenoid” Wire.
C) The Brown “Solenoid” Wire closes the solenoid contacts and sends 12vdc power to the pump motor.
D) The White “Angle Right” Wire sends 12vdc power to the Angle Right Valve Coil.
E) See Next Page For Hydraulic Flow Chart
15a Fuse
-
C)
+
Vehicle Battery
Headlight Switch
Must Be Ignition Switched
B)
Angle Switch
Switch Panel Control
Viewed From Behind
Lift/Float Switch
Source
A) 12vdc
Black wire
Solenoid Control
Brown Wire
Chassis Ground
D)
Continuous Connection
Angle Right
White Wire
12vdc Switched
By Solenoid
Ground
C)
Power
D)
SNOWPLOWS
Ground Connection
Internal In Plow Side Harness
ANGLE RIGHT FUNCTION - HYDRAULIC
E) “B” Port
F)
“A” Port
Right Cylinder
What Happens:
A) Right Angle Function is Activated
With Controller
B) Brown Wire Activates Motor Solenoid
C) 12vdc Motor Spins Pump Developing
Pressure
D) White Wire Shifts “Angle Valve” to
Angle Right Position
E) Pump Pressure is Supplied to “B” Port
Extending Left Angle Cylinder.
F) As Plow Angles to the Right, Fluid
from the Right Angle Cylinder returns
to the Reservoir
Left Cylinder
“X” Port
Jack Cylinder
“H” Port
Lift Cylinder
Cross-Over Relief
For Left Cylinder
Cross-Over Relief
For Right Cylinder
Jack Retract
Valve
Plow Float
Valve
Plow Lift/Jack Extend
Valve: 1TBM7
D) Angle Valve: 1TBM1
P
C) Pressure Supply
From Power Unit
T
F) Fluid Return To
Reservoir
Pressure Side
Fluid Supply
Fluid Return
To Reservoir
SNOWPLOWS
PLOW LIFT FUNCTION - ELECTRICAL
AUTOMATIC JACK RETRACT FUNCTION
What Happens:
A) Ignition “On” energizes the controller power source sending 12vdc into the controller . If equipped with a Joystick or Touch Pad,
the Controller power switch must be in the “On” position.
B) Moving the controller to “Plow Lift” position energizes the Red “Plow Lift” Wire the Brown “Solenoid” wire and the Pink/Black
“Jack Retract” Wire.
C) The Brown “Solenoid” wire closes the solenoid contacts and sends 12vdc power to the pump motor.
D) The Red “Plow Lift” wire sends 12vdc to the Plow Lift Valve Coil.
E) The Pink/Black “Jack Retract” Wire sends 12vdc power to the Jack Retract Valve Coil.
F) Note: A Diode is installed between the connection of the Red “Plow Lift” Wire and the Pink/Black “Jack Retract” wire. This prevents the
Plow Lift circuit from being activated when the A-Frame Jack Switch is used for the Jack Retract Function.
G) See Next Page For Hydraulic Flow Chart
Switch Panel Control
Viewed From Behind
Black wire
Must Be Ignition Switched
-
+
C)
Headlight Switch
15a Fuse
Vehicle Battery
Chassis Ground
Continuous Connection
Angle Switch
Solenoid Control
Brown Wire
Lift/Float Switch
A) 12vdc Source
B)
D)
A-Frame
Jack Switch
Plow Lift
Red Wire
12vdc Switched
By Solenoid
F)
Ground
Power
Retract
E) Jack
Pink/Black
SNOWPLOWS
Ground Connection
Internal In Plow Side Harness
PLOW LIFT FUNCTION - HYDRAULIC
JACK RETRACT USING LIFT FUNCTION - HYDRAULIC
“B” Port
Left Cylinder
“A” Port
Right Cylinder
“H” Port
Lift Cylinder
“X” Port
Jack Cylinder
G)
What Happens:
A) Lift Function is Activated With Controller
B) Brown Wire Activates Motor Solenoid
C) 12vdc Motor Spins Pump Developing Pressure
D) Red Wire Shifts “Plow Lift/Jack Extend” Valve
To Lift Function
E) Pink/Black Wire Shifts Jack Retract Valve
F) Pump Pressure is supplied to “H” port
extending Lift Cylinder
G) Jack Cylinder drains fluid through “X” port to
reservoir retracting Jack Leg
F)
Cross-Over Relief
For Left Cylinder
Fluid Restrictor
For Jack Circuit
Cross-Over Relief
For Right Cylinder
Fluid Restrictor
For Lift Circuit
Check Valve For
Lift Circuit
Plow Float
Valve
E) Jack Retract
Valve
D) Plow Lift/Jack Extend
Angle Valve: 1TBM1
Valve: 1TBM7
P
C) Pressure Supply
From Power Unit
SNOWPLOWS
T
G) Fluid Return To
Reservoir
Pressure Side
Fluid Supply
Fluid Return
To Reservoir
PLOW FLOAT FUNCTION - ELECTRICAL
What Happens:
A) Ignition “On” energizes the controller power source sending 12vdc into the controller . If equipped with a Joystick or
Touch Pad, the Controller power switch must be in the “On” position.
B) Moving the controller to “Plow Float” position energizes the Green “Float” Wire.
C) The Green “Float” Wire sends 12vdc power to the Float Valve Coil.
D) The A-Frame Jack Switch is energized any time “Float” is activated
E) See Next Page For Hydraulic Flow Chart
Source
A) 12vdc
Black wire
Switch Panel Control
Viewed From Behind
15a Fuse
+
Vehicle Battery
Lift/Float Switch
-
Headlight Switch
Must Be Ignition Switched
Angle Switch
B)
Solenoid Control
Brown Wire
12vdc Switched
By Solenoid
Chassis Ground
Continuous Connection
Float
C) Plow
Green Wire
Ground
Power
C)
SNOWPLOWS
Ground Connection
Internal In Plow Side Harness
D) A-Frame
Jack Switch
PLOW FLOAT FUNCTION - HYDRAULIC
“B” Port
Left Cylinder
“A” Port
Right Cylinder
“H” Port
Lift Cylinder
“X” Port
Jack Cylinder
C)
What Happens:
A) Float Function is Activated With Controller
B) Green Wire Shifts “Float” Valve To Open
Position
C) Fluid from Lift Cylinder Returns to Reservoir
Through Flow Restrictor slowing retraction.
Cross-Over Relief
For Left Cylinder
Cross-Over Relief
For Right Cylinder
Jack Retract
Valve
B) Plow Float
Valve
Angle Valve: 1TBM1
Plow Lift/Jack Extend
Valve: 1TBM7
P
Pressure Supply
From Power Unit
T
C)Fluid Return To
Reservoir
Pressure Side
Fluid Supply
Fluid Return
To Reservoir
JACK EXTEND FUNCTION - ELECTRICAL
What Happens:
A) Ignition “On” energizes the controller power source sending 12vdc into the controller . If equipped with a Joystick or Touch Pad,
the Controller power switch must be in the “On” position.
B) Moving the controller to “Plow Float” position energizes the Green “Plow Float” Wire which, in turn, sends power to the A-Frame Jack Switch.
C) Moving the A-Frame Jack Switch to the “Jack Extend” position energizes the Blue/Black “Jack Extend” wire and the Brown “Solenoid” wire.
D) The Brown “Solenoid” Wire closes the solenoid contacts and sends 12vdc power to the pump motor.
E) The Blue/Black “Jack Extend” Wire sends 12vdc power to the Jack Extend Valve Coil.
F) See Next Page For Hydraulic Flow Chart
Source
A) 12vdc
Black wire
Switch Panel Control
Viewed From Behind
15a Fuse
+
D)
Vehicle Battery
Angle Switch
Lift/Float Switch
-
Headlight Switch
Must Be Ignition Switched
B)
Solenoid Control
Brown Wire
E)
Chassis Ground
Continuous Connection
12vdc Switched
By Solenoid
C) A-Frame
Jack Switch
E)
Ground
C)
Power
SNOWPLOWS
Ground Connection
Internal In Plow Side Harness
JACK EXTEND FUNCTION - HYDRAULIC
“B” Port
Left Cylinder
“A” Port
Right Cylinder
“H” Port
Lift Cylinder
“X” Port
Jack Cylinder
H)
What Happens:
A) Float Function is Activated With Controller
B) Green Wire Shifts “Float” Valve To Open
Position and powers A-Frame Jack Switch
C) Fluid from Lift Cylinder Returns to Reservoir
D) Jack Extend Function is Activated Using
A-Frame Jack Switch
E) Blue/Black Wire Shifts “Plow Lift/Jack Extend”
Valve to Jack Extend Position
F) Brown wire activates Motor Solenoid sending
power to 12vdc Motor
G) 12vdc Motor spins pump Developing Pressure
H) Pump Pressure is supplied to “X” port
extending Jack Leg from bottom of A-Frame
C)
Cross-Over Relief
For Left Cylinder
Cross-Over Relief
For Right Cylinder
Jack Retract
Valve
B) Plow Float
Valve
Angle Valve: 1TBM1
E) Plow Lift/Jack Extend
Valve: 1TBM7
P
G) Pressure Supply
From Power Unit
T
C)Fluid Return To
Reservoir
Pressure Side
Fluid Supply
Fluid Return
To Reservoir
SNOWPLOWS
JACK RETRACT FUNCTION - ELECTRICAL
USING A-FRAME JACK SWITCH
What Happens:
A) Ignition “On” energizes the controller power source sending 12vdc into the controller . If equipped with a Joystick or Touch Pad,
the Controller power switch must be in the “On” position.
B) Moving the controller to “Plow Float” position energizes the Green “Plow Float” Wire which, in turn, sends power to the A-Frame Jack Switch.
C) Moving the A-Frame Jack Switch to the “Jack Retract” position energizes the Pink/Black “Jack Retract” wire.
D) The Pink/Black “Jack Retract” Wire sends 12vdc power to the Jack Retract Valve Coil.
E) See Next Page For Hydraulic Flow Chart
Source
A) 12vdc
Black wire
Switch Panel Control
Viewed From Behind
15a Fuse
+
Vehicle Battery
Angle Switch
Lift/Float Switch
-
Headlight Switch
Must Be Ignition Switched
B)
Solenoid Control
Brown Wire
Chassis Ground
Continuous Connection
12vdc Switched
By Solenoid
C) A-Frame
Jack Switch
Ground
Power
SNOWPLOWS
D)
Ground Connection
Internal In Plow Side Harness
JACK RETRACT FUNCTION - HYDRAULIC
USING A-FRAME JACK SWITCH
“B” Port
Left Cylinder
“A” Port
Right Cylinder
“H” Port
Lift Cylinder
“X” Port
Jack Cylinder
C)
F)
What Happens:
A) Float Function is Activated With Controller
B) Green Wire Shifts “Float” Valve To Open
Position and powers A-Frame Jack Switch
C) Fluid from Lift Cylinder Returns to Reservoir
Through the “H” port
D) Jack Retract Function is Activated Using
A-Frame Jack Switch
E) Pink/Black Wire Shifts “Jack Retract” Valve
to Jack Extend Position
F) Fluid from Jack Cylinder Returns to Reservoir
through “X” port retracting Jack Leg
Cross-Over Relief
For Left Cylinder
Cross-Over Relief
For Right Cylinder
E) Jack Retract
B) Plow Float
Valve
Valve
Plow Lift/Jack Extend
Valve: 1TBM7
Angle Valve: 1TBM1
P
Pressure Supply
From Power Unit
T
C, F) Fluid Return To
Reservoir
Pressure Side
Fluid Supply
Fluid Return
To Reservoir
SNOWPLOWS
Troubleshooting Index- By Problem
Section A: Hydraulic System
Section C: Lighting Electrical System
! Motor runs, but no plow functions.
! Motor runs, but all functions are slow.
! Motor runs, but blade raises slowly or not at all.
! Motor runs, but blade does not lower.
! Blade lowers in neutral position.
! Blade will not angle in one or both directions, lift and lower
functions are ok.
! Blade will not remain angled.
! Motor runs, but jack leg will not extend.
! No jack functions, motor does not run.
! Jack does not retract.
! No lights on vehicle or plow
! Plow lights will not come on.
! Plow lights function, but vehicle lights will not come on.
! High and low beam reversed on plow.
! High beam indicator not functioning properly.
! Headlight fuse blows after installing new plow lights.
! Plow lights are dim or flicker.
! Turn signals will not function.
! Turn signals flash rapidly.
! No running lights on plow.
Section B: Electrical System
! Pump motor will not run.
! Pump motor runs continually.
! Plow will not raise.
! Plow will not lower.
! Plow will not angle right.
! Plow will not angle left.
! Left & right functions are reversed.
! Raise & lower functions are reversed.
! Plow will not remain in “Float” position.
! Plow jack leg will not extend.
! Plow jack leg will not retract.
! Plow jack will not retract when plow is raised.
! Plow raises when jack leg is retracting.
! Battery goes dead when vehicle is off.
! Battery goes dead when vehicle is running.
Curtis Sno-Pro 3000 Troubleshooting Guide
Section A. Plow Hydraulic System
Symptom
1. Motor runs but no plow
function(s).
2. Motor runs but all
functions are slow
3. Motor runs but blade
raises slowly or does not
raise
Possible Cause
Remedy
Solenoid Coils not receiving voltage Test voltage to coils with meter or test light to verify that coils are
receiving power. If coils are not receiving power, check ground
connection and verify that all coils are connected properly.
Inadequate pump pressure
Remove lift hose from lift cylinder and attach 3,000 psi pressure gauge to
lift hose. Activate plow lift function and read pressure gauge. Gauge
should read 2,000 psi. If not enough pressure or no pressure, remove
relief valve and inspect for damaged spring or ball. If no damage is
apparent, clean using mineral spirits and re-install. Perform pressure
test again.
Inadequate pump pressure
Perform test procedure described above.
Inadequate Pump Flow
Inspect filter cartridge in end head and pick-up screen in reservoir for
clogging. Clean filter or replace.
Insufficient voltage output from
Check alternator output wire with vehicle running at idle, with multimeter
vehicle
for 12-14vdc. If alternator output is less than 12vdc, repair or replace
alternator.
Inadequate pump pressure
Perform pressure test as described in Section A. #1
Lift solenoid valve contaminated
Remove A-frame cover and locate Lift valve. Remove coil retaining nut
from valve and slide the two coils off of the valve stem. Unscrew valve
from manifold block and inspect for contamination. Clean valve with
mineral spirits and blow dry with compressed air. Re-install valve, coils,
and nut. Check plow function. If blade does not raise, go to next test.
Loose or damaged lift hose
Inspect hose for leaks or signs of wear. Replace lift hose if necessary.
Hydraulic System Troubleshooting Guide
Symptom
Cont'd.
4. Blade will not lower
Possible Cause
Remedy
Lower solenoid valve contaminated Remove A-frame cover and locate Lower valve. Remove coil retaining
nut from valve and slide the coil off of the valve stem. Unscrew valve
from manifold block and inspect for contamination. Clean valve with
mineral spirits and blow dry with compressed air. Re-install valve, coil,
and nut. Check plow function.
Lower solenoid valve contaminated Perform test procedure described in Section A, #3.
Orifice Plug Blocked
5. Blade lowers in neutral.
Remove hose from port "H" on the manifold. Use a thin wire to remove
orifice from within the "H" port. Blow out orifice with compressed air. Reinstall in reverse order. Check plow function.
Lower solenoid valve contaminated. Perform test procedure described in Section A, #3.
6. Blade will not angle in
Solenoid coils are not receiving
one or both directions, lift
voltage.
and lower functions are ok.
Angle solenoid valve is
contaminated
7. Blade will not remain
angled.
Cross port relief valve(s)
contaminated or damaged.
Check voltage to coils with 12v test light or multimeter. With plow
attached to truck, remove A-frame cover and locate angle solenoid valve.
Ground test light or meter to main plow ground wire. Unplug outer(left)
solenoid coil plug and insert probe into harness end of coil plug(note: the
orange wire on all solenoid coils is a ground wire, 12v+ wire color varies.
Activate plow angle function and check for voltage. If voltage if present,
reattach coil plug to outer solenoid coil and insert probe into 12v+ coil
wire. Activate plow angle function. If voltage is not present, replace
solenoid coil. If voltage is present, repeat procedure for inner coil.
With A-frame cover removed, locate angle solenoid valve. It may be
necessary to remove the pump unit from the A-frame cavity for this step.
Once pump is removed, remove coil retaining nut and slide the two coils
off of the valve stem.
Use an allen key to remove the cross port relief plugs. Remove ball and
spring from within cavity and inspect for any damage or wear, replace if
necessary. Inspect bottom of cavity surface and remove any
contamination, clean with mineral spirits and re-assemble.
Hydraulic System Troubleshooting Guide
Symptom
8. Motor runs but jack leg
will not extend.
Possible Cause
Jack extend coil is not receiving
sufficient voltage.
Jack extend solenoid valve
contaminated
Jack retract solenoid valve
contaminated
Orifice plug contaminated.
Remedy
Remove A-frame cover. Locate jack extend solenoid coil. Perform
procedure described in Section A, #6 on jack extend solenoid coil,
replace solenoid coil if necessary.
With A-frame cover removed, locate jack extend solenoid valve(pp. 12,16
for detail). Remove coil retaining nut and slide two solenoid coils off of
valve stem. Unscrew valve from manifold. Clean valve with mineral
spirits and blow dry with compressed air. Re-install valve and coils in
reverse order and check jack function.
With A-frame cover removed, locate jack retract solenoid valve. Remove
coil retaining nut and slide coil off of valve stem. Unscrew valve from
manifold and clean with mineral spirits. Blow dry with compressed air
and re-install in reverse order. Check jack function.
Remove A-frame cover. It is necessary to remove the pump from the Aframe cavity for this step. Remove the hose and adapter from "X" port
on manifold. Use a 3mm allen key and remove the orifice plug located at
the bottom of the "X" port. Clean orifice with mineral spirits and blow dry
with compressed air. Re-install in reverse order and check jack function.
9. No jack functions, motor Poor harness connection at front of Check harness plug connection at plug mount and verify good contact.
does not run.
vehicle.
Plug must be coated with di-electric grease periodically to prolong the life
of the pin connectors.
In-cab controls not in the float
Select "float" position on in-cab controls and re-try jack function.
position.
10. Jack does not retract. Low or no voltage to "Jack Retract" Check for voltage at retract coil with 12v test light or multimeter using
solenoid coil.
procedure described in Section A, #6. If voltage is present, see next
step.
Low or no voltage to "Lift" solenoid Check for voltage at lift coil with 12v test light or multimeter using
coil.
procedure described in Section A, #6. If voltage is present, see next
step.
Hydraulic System Troubleshooting Guide
Symptom
10. Jack does not retract.
Possible Cause
Remedy
Jack Retract solenoid valve
contaminated.
Remove A-frame cover and locate "Jack Retract" solenoid coil(pp.
12,16). Remove coil retaining nut, solenoid coil, and valve from manifold.
Clean valve with mineral spirits and blow dry with compressed air. Reinstall and check function.
Jack Retract Return Spring does
not have enough tension
Remove bottom A-frame cover and locate "Jack Return Spring". Locate
adjuster nut on spring guide rod. Tighten adjuster nut against return
spring to increase tension. Do this step in 1/4" increments and check
function.
Orifice plug contaminated.
Remove A-frame cover. It is necessary to remove the pump from the Aframe cavity for this step. Remove the hose and adapter from "X" port
on manifold. Use a 3mm allen key and remove the orifice plug located at
the bottom of the "X" port. Clean orifice with mineral spirits and blow dry
with compressed air. Re-install in reverse order and check jack function.
Section B. Plow Electrical System
Symptom
1. Pump motor will not run.
Possible Cause
Remedy
Check that Main Power Connector Plug in Connector.
is connected properly.
Check for voltage at Main Power
Connector pins 1 and 2 with ignition
switch on and LIFT, RIGHT or
LEFT function is activated.
If voltage is present, remove pump cover and check for voltage at pump
with ignition switch on and LIFT, RIGHT or LEFT function is activated, if
voltage is present, pump has failed or pump has seized. If voltage is not
present go to next test.
Check for voltage at solenoid by
testing for voltage at both large
terminals and ground.
Check for voltage at other large
terminal on solenoid by testing for
voltage between terminal and
ground while applying power to the
small terminal with the Brown wire.
If voltage is not present between one large terminal and ground, check
the cable from the solenoid to the battery for disconnected cable or
broken cable. If voltage is present go to next test.
If no voltage is present, solenoid has failed.or solenoid is not grounded,
ground solenoid bracket and retest. If voltage is present go to next test.
Electrical System Troubleshooting Guide
Symptom
1. Pump motor will not run.
2. Pump motor runs
continually.
3. Plow will not raise.
4. Plow will not lower.
Possible Cause
Remedy
Check the Black wire for voltage at
the white 9-pin connector in cab
with the ignition switch on.
Check wiring in control. Check for
voltage to control switches with
ignition switch on and control
switch ON test all Black wires for
voltage.
Check for voltage to brown wire at
control switches with ignition switch
ON and a LIFT, RIGHT or LEFT
function is activated.
Disconnect switch control or
joystick control at the white 9-pin
connector in cab.
If no voltage is present, power is disconnected from fuse box or fuse has
been tripped. If voltage is present go to next test.
With ignition switch On and Lift
function activated check for voltage
between the Red and Orange
ground wire on valve body power
connector.
With ignition switch On and Lift
function activated check for voltage
between terminal 4 and terminal 1
(Ground) on Vehicle Main power
connector.
If voltage is present, valve coil or solenoid valve has failed or Battery is
weak or defective. If voltage is not present go to next test.
If voltage is not present on all black wire terminals and ground, check for
disconnected wires or broken wires. If voltage is present go to next test.
If voltage is not present on brown wire terminal and ground with a
function activated. Check for disconnected wires or broken wires or failed
switch.
If pump continues to run, pump solenoid has failed in a locked on
position. Remove power to pump by disconnecting Main Power
Connector. Replace solenoid.
If pump stops running, check control for stuck switches or a short
between black and brown wires.
Check that Main Power Connector Plug in Connector.
is connected properly.
If no voltage is present, check for broken wires or broken or corroded
terminals on vehicle harness. If voltage is present, check for broken or
corroded wires or terminals on the Plow harness.
Check that Main Power Connector Plug in Connector.
is connected properly.
Electrical System Troubleshooting Guide
Symptom
Possible Cause
4. Plow will not lower.
Remedy
With ignition switch On and Float
function activated check for voltage
between the Green and Orange
ground wire on valve body power
connector.
With ignition switch On and Lift
function activated check for voltage
between terminal 3 and terminal 1
(Ground) on Vehicle Main power
connector.
5. Plow will not Angle Right. Check that Main Power Connector
is connected properly.
If voltage is present, valve coil or solenoid valve has failed or Battery is
weak or defective. If voltage is not present go to next test.
With ignition switch On and Right
function activated check for voltage
between the White and Orange
ground wire on valve body power
connector.
With ignition switch On and Lift
function activated check for voltage
between terminal 6 and terminal 1
(Ground) on Vehicle Main power
connector.
Check that Main Power Connector
is connected properly.
If voltage is present, valve coil or solenoid valve has failed or Battery is
weak or defective. If voltage is not present go to next test.
6. Plow will not Angle Left.
If no voltage is present, check for broken wires or broken or corroded
terminals on vehicle harness. If voltage is present, check for broken or
corroded wires or terminals on the Plow harness.
Plug in Connector.
If no voltage is present, check for broken wires or broken or corroded
terminals on vehicle harness. If voltage is present, check for broken or
corroded wires or terminals on the Plow harness.
Plug in Connector.
With ignition switch On and Left
If voltage is present, valve coil or solenoid valve has failed or Battery is
function activated check for voltage weak or defective. If voltage is not present go to next test.
between the Blue and Orange
ground wire on valve body power
connector.
Electrical System Troubleshooting Guide
Symptom
Possible Cause
5. Plow will not Angle Right. With ignition switch On and Lift
function activated check for voltage
between terminal 5 and terminal 1
(Ground) on Vehicle Main power
connector.
7. Left & Right functions
Verify the correct wire placement of
reversed.
the White and Blue wires by
referring to the Curtis SNO-PRO
3000 Harness Layout page.
With the switch panel verify the
correct wire placement at the
switch.
8. Raise & Lower functions Verify the correct wire placement of
reversed.
the Red and Green wires by
referring to the Curtis SNO-PRO
3000 Harness Layout page.
9. Plow will not Remain in
Float.
Remedy
If no voltage is present, check for broken wires or broken or corroded
terminals on vehicle harness. If voltage is present, check for broken or
corroded wires or terminals on the Plow harness.
Plug connectors in the correct location.
Switch the Blue and White wires at the back of the switch panel.
Plug connectors in there correct place.
With the switch panel verify the
Switch the Red and Green wires at the back of the switch panel.
correct wire placement at the
switch.
Check Raise and Lower switch for Replace switch.
worn out Detent position by testing
for maintained voltage between the
Green and Orange ground wires.
Check Joystick control for worn out Bend switch actuator to compensate for worn out detent, Replace detent
Detent position or bent switch
assembly or Joystick control.
actuator by testing for maintained
voltage between the Green and
Orange ground wires.
Verify a good ground to Joystick
Ground Orange wire.
control.
Electrical System Troubleshooting Guide
Symptom
10. Plow Jack will not
Extend.
Possible Cause
With ignition switch On and Float
If voltage is present go to next test. If voltage is not present, check for
function activated check Green wire voltage between the Green and Orange ground wire on valve body power
on Jack switch for voltage.
connector. Verify that control is in Float check for broken wires.
With ignition switch On and Control
in Float, Push the Jack switch
Down (Jack Extend) and verify that
Pump motor runs.
With ignition switch On and Control
in Float, Push the Jack switch
Down (Jack Extend) and check for
voltage between the Light
Blue/Black and Orange ground wire
on valve body power connector.
11. Plow Jack will not
Retract.
Remedy
If Pump motor runs go to next test. Check for voltage on brown wire
terminal and ground with a function activated. Check for correct wire
placement at the switch, disconnected wires or broken wires or failed
switch.
If voltage is present, valve coil or solenoid valve has failed or Battery is
weak or defective. If voltage is not present, Check for correct wire
placement at the switch, disconnected wires or failed switch.
With ignition switch On and Float
If voltage is present go to next test. If voltage is not present, check for
function activated check Green wire voltage between the Green and Orange ground wire on valve body power
on Jack switch for voltage.
connector. Verify that control is in Float check for broken wires.
With ignition switch On and Control If voltage is present, valve coil or solenoid valve has failed or Battery is
in Float, Lift the Jack switch Up
weak or defective. If voltage is not present, Check for correct wire
(Jack Retract) and check for
placement at the switch, disconnected wires or failed switch.
voltage between the Pink/Black and
Orange ground wire on valve body
power connector.
12. Plow Jack will not
With ignition switch On and Lift
If voltage is present, valve coil or solenoid valve has failed or Battery is
Retract when plow is raised. function activated check for voltage weak or defective. If voltage is not present, check for broken wires or
between the Pink/Black and
failed Jack Retract Diode.
Orange ground wire on valve body
power connector.
Electrical System Troubleshooting Guide
Symptom
Possible Cause
Remedy
13. Plow raises when jack is With ignition switch On and Control If voltage is present, Jack Retract Diode has failed. Replace diode.
retracting.
in Float, Lift the Jack switch Up
(Jack Retract) and check for
voltage between the Pink/Black and
Orange ground wire on valve body
power connector.
14. Battery goes dead when Disconnect switch control or
vehicle is OFF.
joystick control at the white 9-pin
connector in cab with ignition
switch Off check for voltage
between the Black and Orange
ground.
If voltage is present, move Black wire to a switched circuit that turns off
with the vehicles ignition switch.
15. Battery goes dead when Test Condition of Vehicles Battery. Charge battery and retest or Replace battery.
vehicle is Running.
Test Condition of Vehicles charging Repair charging system.
system.
Check for electrical shorts.
Repair electrical shorts in electrical system.
Section C: Plow Lighting Electrical System
Symptom
1. No lights on Vehicle or
Plow.
Possible Cause
Check electrical connections.
Remedy
Verify connections at toggle switch, headlight adapters and plow
headlight connectors refer to Curtis Harness Layout sheet.
Chech headlight adapters.
Insure that proper headlight adapters are being used.
Note: Some new vehicles (Ground Test)With Headlight switch If voltage is not present, Check for disconnected wires or broken wires.
use a (Floating Ground) or On check for voltage to Light Green Repair or replace as necessary.
(Hot Ground) system, check and ground for Low beam and
with vehicle manufacture for Yellow and ground for High beam.
test procedure.
Lighting Electrical System Troubleshooting Guide
Symptom
Possible Cause
Remedy
(Floating Ground or Hot Ground)
If voltage is not present, Check for disconnected wires or broken wires.
With Headlight switch On check for
voltage to Light Green and (12 Volt
+) for Low beam and Yellow and
(12 Volt +) for High beam.
2. Plow lights will not come Check electrical connections.
ON.
With Headlight switch On and
Headlight toggle switch set to Plow
check for voltage between
terminals 8 and 9 for Low Beam
and terminals 8 and 10 for High
Beam on Vehicle Main power
connector.
3. Plow lights function but
Incorrect headlight adapter kit
Vehicle lights will not come
ON.
4. High and Low beam
Check electrical connections on
reversed on Plow.
toggle switch.
Check headlight adapters.
5. High beam indicator not Check electrical connections on
functioning properly.
toggle switch.
Check electrical connections at
headlight and headlight adapters.
6. Headlight fuse blows
Remove Plow headlight bulb and
after installing new Plow
check that there is NO wire from 3
Lights.
prong head light connector to
ground.
Verify connections at toggle switch and plow headlight connectors refer
to Curtis Harness Layout sheet.
Verify headlight adapter kit number and wiring connections. Verify light
switch is wired correctly.
Verify connections at toggle switch, headlight adapters and plow
headlight connectors refer to Curtis Harness Layout sheet.
Insure that proper headlight adapters are being used.
Verify connections at toggle switch, headlight adapters and plow
headlight connectors refer to Curtis Harness Layout sheet.
Verify connections at headlight adapters and plow headlight connectors
refer to Curtis Harness Layout sheet.
Replace with original CURTIS snow plow lights.
Lighting Electrical System Troubleshooting Guide
Symptom
Possible Cause
7. Plow parking & directional Check plow lights for good ground.
lights are dim and/or flicker
Check electrical connections for
corroded or damaged terminals.
8. Turn signals will not
Check electrical connections to
function.
vehicle wiring See Harness Layout
for proper connections.
9. Turn signals flash rapidly. Check for burned out bulb
filaments.
Check Flasher.
10. No running lights on
Check electrical connections to
plow.
vehicle wiring See Harness Layout
for proper connections.
Remedy
Remove paint under headlight mounts and retighten mounting bolt.
Repair or replace damaged terminals.
Repair any damaged connections.
Replace Bulbs.
Replace original vehicle flasher with heavy-duty flasher.
Repair any damaged connections.
Date:
Filled Out By:
Dealer Account Number:
Warranty Claim
Distributor or Dealer Name:
123456
City:
State:
Zip:
City:
State:
Zip:
Customer Name:
Address:
SNOWPLOWS
111 Higgins Street
Worcester, Ma. 01606
508-853-2200
SA
M
PL
E
Section 1
Address:
Equipment Information
Model:
Serial NO:
Date of Purchase:
Date of Failure:
Vehicle Make & Model:
Date of Repair:
Section 2
DESCRIPTION OF FAILURE/REASON FOR CREDIT (DO NOT SAY DEFECTIVE)
DEALER SIGNATURE:
IMPORTANT
To Be Eligible For Warranty Consideration
1. Claim Must Be Submitted Within 30 Days
Of Failure
2. Completely Fill Out One Claim Form For
Each Unit Repaired. Do Not Write in
Shaded Areas
3. Claim Forms Must Be Accompanied By
A Copy Of Original Sales Receipt
4. Parts Replaced And Submitted For
Warranty Consideration Must Be
Maintained At Distributor/Dealer Facility
For A Period Of 90 Days After Submitting
Warranty Claim
LIST ALL PARTS REPLACED
PART NO.
RETURN
PART?
DESCRIPTION
AMOUNT
Section 3
QTY.
W AR R AN T Y LABO R
D E S C R IP T IO N O F W O R K P E R F O R M E D
Total Parts
HOURS
TO TAL
Section 4
R E P A IR
CODE
Total Credits
PARTS RETURNED BY:
UPS
T O T A L LA B O R
A LLO W A N C E
E XP LA IN & A T T A C H R E C E IP T S F O R "O T H E R C R E D IT S "
CLAIM APPROVED
Distribution: White-Curtis Office Copy
Canary-Warranty Dept. Pink-Dealer Copy
COMMERCIAL CARRIER
O T H E R C R E D IT S
TO TAL
Do Not Write In This Space
Total Labor &
Other Credits
CLAIM PENDING
RETURN & INSPECTION
CUSTOMER DROP-OFF
CLAIM DENIED
COMMENTS:
2003 Curtis Tractor Cab, Inc.
Printed in U.S.A. Form #3025
SNOWPLOWS
Curtis International, Inc. 111 Higgins Street Worcester, Ma. 01606
Phone: 508-853-2200 Fax: 508-854-3377
Warranty Claim Processing
Eligibility Requirements To Qualify For Warranty Consideration
1.
2.
3.
4.
Repair condition occurred within 12 months of the original purchase date.
A copy of the original sales receipt is submitted to Curtis with the Warranty Claim form.
The Owner Registration Form is on file at Curtis.
The Vehicle Condition Inspection & Snowplow Installation/Delivery Checklist was completed
and is on file at Curtis.
5. Repair must be completed by an authorized Curtis dealer within 30 days of failure.
Completing The Warranty Repairs and The Warranty Claim Form
1. Complete Customer/Equipment Information Section 1.
2. Diagnose problem, determine corrective action to be taken and complete Section 2.
3. Complete Section 3 detailing parts to be submitted for warranty consideration.
Parts required to complete the repair must come from dealer inventory.
If you need parts to complete the repair, order them within the normal ordering process.
Parts will be shipped and charged to your account with a credit issued when the claim is
approved.
4. Complete Section 4 detailing labor to be submitted for warranty consideration.
For repair codes, see reverse side for Flat Rate Schedule and allowances.
If repairs are not listed in the Flat Rate Schedule, contact Curtis Warranty Department at
1-800-343-7676 for approval prior to making repairs.
5. Parts replaced for the repair must be kept at the dealer/distributor location for a period of 90
days, identified by the equipment serial number and Warranty Claim Form number.
Curtis may, within a 90 day period, request any and all parts be returned for examination
before approval of the warranty claim.
Parts returned should be returned transportation prepaid.
Do not return parts unless requested to do so by Curtis.
Submitting Warranty Claim For Consideration
Once the repairs have been completed, review the Claim Form for accuracy and completeness
and submit the top two copies (white & canary) to Curtis Warranty Department at the address
listed on the claim form with a copy of the original sales receipt. Retain the pink copy of the Claim
Form for your records. Missing or inaccurate information will delay the processing and
crediting of your account for parts and labor.
Curtis Tractor Cab, Inc. 111 Higgins Street Worcester, Ma. 01606
Telephone: (508) 853-2200 Fax: (508) 854-3377
Curtis snowplows are protected by the following U.S. Patent numbers: 6,145,222 and 6,209,231 and
Licensed under U.S. Patent number: 5,568,694 and Canadian Patent Number 2,137,853. Other patents pending.
2004 Curtis Tractor Cab, Inc./Curtis International
All Rights Reserved. Printed in U.S.A..
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