Western UniMount MVP User manual

June 15, 2003
Lit. No. 21857
®
MECHANIC'S GUIDE
SNOWPLOWS
CAUTION
Read this manual before
servicing the WESTERN®MVP®
snowplow.

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Lit. No. 21857 June 15, 2003
PREFACE
This guide has been prepared to
assist the trained mechanic in the
service of WESTERN®snowplows. It
also provides safety information and
recommendations. We urge all
mechanics to read this manual
carefully before attempting to service
the WESTERN snowplow equipment
covered by this guide.
Service of your WESTERN snowplow
equipment is best performed by your
local Western Products outlet. They
know your snowplow best and are
interested in your complete
satisfaction.
TABLE OF CONTENTS
Preface ............................................................................................................. 2
Safety Information ........................................................................................... 3
Tools Required ................................................................................................ 5
Product Specifications .................................................................................... 5
Hose Routing ................................................................................................... 6
MVP®FloStat®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
Terminal Removal Tool and Terminal Replacement ................................... 71

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Lit. No. 21857 June 15, 2003
SAFETY INFORMATION
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.
WARNING
Do not exceed GVWR or GAWR
(including blade and ballast) as
found on the driver-side door
cornerpost of the vehicle.
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.
WARNING
Hydraulic oil under pressure
could cause skin injection
injury. If you are injured by
hydraulic oil, get medical
treatment immediately.
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.
WARNING
Remove blade assembly before
placing vehicle on hoist. Failure
to do this could result in
personal injury.
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.
BEFORE YOU BEGIN
VENTILATION
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
Be careful when using gasoline. Do
not use gasoline to clean parts. Store
only in approved containers away
from sources of heat or flame.
• 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
handy, rated BC for flammable
liquids and electrical fires.
HYDRAULIC SAFETY
• Always inspect hydraulic
components and hoses before
using. Replace any damaged
or worn parts immediately.
• If you suspect a hose leak, DO
NOT use your hand to locate it.
Use a piece of cardboard or
wood.

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Lit. No. 21857 June 15, 2003
Instruction LabelWarning Label
WARNING
CAUTION
LOWER BLADE WHEN VEHICLE IS PARKED.
REMOVE BLADE ASSEMBLY BEFORE PLACING VEHICLE
ON HOIST.
DO NOT EXCEED GVWR OR GAWR INCLUDING BLADE
AND BALLAST.
READ OWNER'S MANUAL BEFORE OPERATING OR
SERVICING SNOWPLOW.
TRANSPORT SPEED SHOULD NOT EXCEED 45 MPH.
REDUCE SPEED UNDER ADVERSE TRAVEL
CONDITIONS.
PLOWING SPEED SHOULD NOT EXCEED 10 MPH.
SEE YOUR WESTERN OUTLET FOR APPLICATION
RECOMMENDATIONS.
59900
SAFETY INFORMATION
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
BATTERY SAFETY Please become familiar with and make owners knowledgeable of
the Warning and Instruction labels on the back of the blade!
Warning Label

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Lit. No. 21857 June 15, 2003
PRODUCT SPECIFICATIONS
V-Plow Specifications
Required:
• Long/Slender 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
• 12V Test Light
• Torque Wrench (IN-LB)
Recommended :
• Combination Wrenches:
1-1/16", 1-1/8"
• Deep Sockets: 11/16", 7/8",
1-1/16", 1-1/8"
• Volt/Ohm Meter
• Pencil Magnet
• 3000 PSI Pressure Gauge
For replacing trip springs :
• Removable Spring Tool —
available from your Western
Products outlet
Hydraulic System
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
• WESTERN®High Performance
Fluid to -25°F (-32°C)
• Automatic Transmission Fluid
(ATF) Dexron III to -10°F
(-23° C) or,
• Texaco 1537 Aircraft Hydraulic
Oil for temperatures below
-25° F (-32°C).
REQUIRED TOOLS
For servicing the electrical and
hydraulic system
Solenoid Valve Spool Travel = 0.07
Inches for three way and four way
valves
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. at 1750 psi.
• Headlamp Relay Coil
Resistance = 106 Ohms
• Headlamp Relay Amp Draw =
0.1 Amp.
Fuse Size
• Harness – 10 Amp.
(10AFB 3AG)
• Circuit Board (2) – 5 Amp.
(5AFB SMD)
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.
CAUTION
Do not mix different types of
hydraulic fluid. Some fluids are
not compatible and may cause
performance problems and
product damage.

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Lit. No. 21857 June 15, 2003
HOSE ROUTING
90°Street Elbow and Straight Swivel
18" Hose
38" Hose
36" Hose
Hydraulic Unit
5° Swivel
38" Hose
36" Hose
Base End
Lift Cylinder
Passenger Side (Right)
Angle Cylinder
Base End
Base End
Driver Side (Left)
Angle Cylinder

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Lit. No. 21857 June 15, 2003
MVP®FLOSTAT®PARTS DIAGRAM
Old Style
Oil Pick Up Tube
Motor
Solenoid Valve Coil
Solenoid Valve Cartridge
Relief Valve
Pilot Operated
Check Valve
Reservoir
Pump ilter
Pump
Oil Return Line
Quill
Secondary Valve
Block
Primary Valve
Block

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Lit. No. 21857 June 15, 2003
SOLENOID CARTRIDGE VALVE IDENTIFICATION AND LOCATION
Solenoid Cartridge ValveS1
(SV08-2004)
Solenoid Cartridge ValveS6
(SV08-30)
Solenoid Cartridge ValveS4
(SV08-30)
Solenoid Cartridge
ValveS5
(SV08-40)
Solenoid Cartridge ValveS3
(SV08-43)
Solenoid Cartridge ValveS2
(SV08-40)

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Lit. No. 21857 June 15, 2003
RELIEF VALVE IDENTIFICATION AND LOCATION
Right Secondary
Relief Valve
Right Primary
Relief Valve
Left Primary
Relief Valve
Left Secondary
Relief Valve
Pump Relief
Valve

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PILOT OPERATED CHECK VALVE IDENTIFICATION AND LOCATION
Pilot Operated (P/O)
Check Valve B
Pilot Operated (P/O)
Check Valve D
Pilot Operated (P/O)
Check Valve C
Pilot Operated (P/O)
Check Valve A

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Lit. No. 21857 June 15, 2003
VEHICLE HARNESS AND VEHICLE CABLE LOCATION
MODE
L
S
/
P
LOWER
C
FLT
R
/
V
E
E
RAISE
PWR
Control ON/OFF
Switch
Control
Bracket
1 -pin Connector
(in-cab)
Red Wire
Fuse
Holder Self-Stripping
Connector (Blue)
Vehicle Wire Controlled
by Ignition Switch
Wires to
Headlamp Relays
Vehicle Cable
Assembly
Black Wire
Red Wire
Vehicle
Harness
To Negative
Battery Terminal
22" Red Cable
Secondary
(Large)
Terminals
Motor Relay
Primary
(Small)
Terminals
Brown/Red
Orange/
Black
Firewall
Grommet
+
-
Small Red
Wire
Vehicle Cable
Assembly
Connector
Vehicle
Harness
Connector
Faston
Connector
Brown/Green

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Lit. No. 21857 June 15, 2003
WARNING
OPERATING THE SNOWPLOW
CabCommand Hand-Held Control
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.
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.
Function Time Outs
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 will automatically turn off
after being idle for 20 minutes.
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.
SMOOTH STOP
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.
1. Turn the vehicle ignition switch
to the ON or the ACCESSORY
position.

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Lit. No. 21857 June 15, 2003
Straight Blade Mode—Default
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:
OPERATING THE SNOWPLOW
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.
Lower 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.
L / SCP Press this button to angle both wings to the left.
R / VEE Press this button to angle both wings to the right.
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.
Lower 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.
L / SCP Press this button to extend both wings to the scoop position.
R / VEE Press this button to retract both wings to the vee position.
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:

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Lit. No. 21857 June 15, 2003
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.
Lower 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.
L / SCP Pressing this button the first time will retract the left wing.
Pressing this button the next time will extend the left wing.
R / VEE Pressing this button the first time will retract the right wing.
Pressing this button the next time will extend the right wing.

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Lit. No. 21857 June 15, 2003
Plow Hydraulics
The MVP®snowplow
FloStat®hydraulic system
performs 10 blade
movement functions.
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 MVP snowplow hydraulics is
defined as a low side drive system.
MOVEMENT
BLADE
RAISE LOWER
ANGLE
RIGHT
ANGLE
LEFT
RIGHT
EXTEND
RIGHT
RETRACT
LEFT
RETRACT SCOOP VEE
(DEFAULT)
STRAIGHT BLADE
R/VEE L/SCP R/VEE *
R/VEE *
WING
CONTROLLER MODE
CONTROLLER BUTTON
V / SCOOP
L/SCP * L/SCP R/VEE RAISE LOWER
ALL ALL
EXTEND
LEFT
L/SCP *
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:
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.
THEORY OF OPERATION
Low side drive provides a common
live hot (12V) to all of the loads (coils,
relay, 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

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Lit. No. 21857 June 15, 2003
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
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.
THEORY OF OPERATION

Lit. No. 21857 June 15, 2003
17
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.
NOTE:
Left side = Driver side
Right side = Passenger side
FILTER,STRAINER
DIFFUSER
COMPONENT ENCLOSURE
ELECTRIC MOTOR
CYLINDER
HYDRAULIC PUMP
FIXED DISPLACEMENT
LINE, TO RESERVOIR
BELOW FLUID LEVEL
LINES CROSSING
LINES JOINING
LINE, PILOT (FOR CONTROL)
LINE, WORKING (MAIN)
FLOW, DIRECTION OF
HYDRAULIC FLUID
SOLENOID, SINGLE WINDING
SPRING
VALVE, ADJUSTABLE
PRESSURE RELIEF
VALVE, FLOW CONTROL,
ADJUSTABLE-
NON-COMPENSATED
VALVE, TWO POSITION
TWO CONNECTION
(TWO WAY)
VALVE, TWO POSITION
THREE CONNECTION
(THREE-WAY)
VALVE, TWO POSITION
FOUR CONNECTION
(FOUR-WAY)
HYDRAULIC LEGEND
CROSSING WIRE
WIRE SPLICE
FUSE
SOLENOID
CIRCUIT GROUND
MOTOR RELAY
BATTERY
MOTOR
ELECTRICAL LEGEND
IN LINE CONNECTOR
WIRE CONTINUES
ELSEWHERE
LIGHT
PILOT OPERATED (P/O)
CHECK VALVE
COMPONENT ENCLOSURE
M+

HYDRAULIC AND ELECTRICAL SCHEMATICS
Wire Color Code Abbreviations
BLK Black BRN/RED Brown w/ Red LTBLU/ORN Light Blue w/ Orange TAN Tan DRL Daytime Running Lights
BLK/ORN Black w/ Orange DKBLU Dark Blue LTBLU/WHT Light Blue w/ White VIO Violet MTR RLY Motor Relay
BLK/RED Black w/ Red DKBLU/ORN Dark Blue w/ Orange LTTAN Light Tan WHT White P/T SIG Park / Turn Signal
BLK/WHT Black w/ White DKBLU/WHT Dark Blue w/ White ORN Orange WHT/YEL White w/ Yellow
BLU Blue GRN Green ORN/BLK Orange w/ Black YEL Yellow
BLU/ORN Blue w/ Orange GRY Gray PNK Pink
BRN Brown LTBLU Light Blue PUR Purple
BRN/GRN Brown w/ Green LTGRN Light Green RED Red

Lit. No. 21857 June 15, 2003
18
ELECTRICAL SCHEMATIC
3
6
5
7
2
1
8
9
10
11
2
3
1
2
3
1
MTR RLY
30
87A
87
86 85
30
87A
87
86 85
REDRED REDRED
** HAND HELD
CONTROL
10AFB
IGNITION
RED
LOCATED UNDER DASH
ORN
BLU
WHT
GRY
YEL
VIO
3
6
5
7
2
1
RED 8
9
GRN
TAN
10
11
BRN
3
6
5
7
2
1
8
9
10
11
COIL CORD HARNESS
**
REPRESENTATION
OF PRINTED
CIRCUIT BOARD
12
13
1
3
6
5
7
2
1
8
9
10
11
12
13
1
BLK
12V BATTERY
LOCATED NEAR BATTERY
#6 RED
#6 BLK
#6 RED
BRN/GRN
BRN/RED
#6 RED
#6 BLK
#6 BLK
#6 RED
#6 BLK
RED
1
3
2
5
7
6
8
9
10
11
12
1
3
2
5
7
6
8
9
10
11
12
LT BLU/ORN
BRN
BLU/ORN
BLU/ORN
BLK/WHT BLK/WHT
PUR
GRY
HIGH
BEAM
GRN (HIGH)
YEL (LOW)
TO VEHICLE
HEADLAMPS
GRY
BRN
PUR
FROM VEHICLE
HEADLAMP
CONNECTOR
RED (HIGH)
ORN (LOW)
COMPONENTS LOCATED NEAR FRONT OF VEHICLE
LOW
BEAM
TO PARK
LAMP BULLET
TO LEFT TURN
LAMP BULLET
TO RIGHT TURN
LAMP BULLET
BLK/ORN
BRN
86 85
87
87A
30
BLU (GND)BLU (GND)
LT BLU/ORN
BLK
WHT/YEL
LT GRN
LT BLU
BLK/ORN
WHT
LT BLU
WHT/YEL
LT GRN
BRN/GRN
RED
ORN/BLK
BRN/RED
WHT BLK
S6 SOLENOID
LT BLU/ORN
PUMP MOTOR
#6 RED
M
#6 BLK
S3 SOLENOID
LT GRN
LT BLU
S2 SOLENOID
RIGHT SIDE PLOW LAMP
S5 SOLENOID
BLU/ORN
BLK/WHT
S SOLENOID
WHT/YEL
S1 SOLENOID
RED
BLK/ORN
+

BLK (LOW BEAM)
WHT (HIGH BEAM)
L
P
HEADLAMP
T
P
T
P/T SIG PUR
BRN
PUR
BRN
H
PLOW ASSEMBLY
BLK/ORN
(GROUND)
P/T SIG
HEADLAMP
GRY
BRN
BRN
RED
RED
P
T
P
T
L
H
LEFT SIDE PLOW LAMP
BRN
WHT
BLK/ORN
BLK
LT BLU/ORN
BRN
BLU/ORN
BLK/WHT
PUR
GRY
BLK
WHT/YEL
LT GRN
LT BLU
BLK/ORN
WHT
RED
#6 RED
ORN/BLK
WHT
BLK
BLK/ORN
PUR
BRN

Lit. No. 21857 June 15, 2003
19
HYDRAULIC SCHEMATIC
M
LEFT
RIGHT
3000 PSI
3000 PSI
3500 PSI
3500 PSI
1750 PSI
S6
S3
S1
S5
S
S2
(C)
(D)
(A) (B)
LIFT
RELIEF VALVE
SECONDARY
RELIEF VALVE
SECONDARY
SECONDARY BLOCK ASSY. PRIMARY BLOCK ASSY.
VALVE
RELIEF
PRIMARY
PRIMARY
RELIEF
VALVE
VALVE
RELIEF
PUMP
MOTOR
SV08-200
SV08- 0
SV08- 3
SV08- 0
SV08-30 S6
S5
S3
S2
S1
M
S
SV08-30
ON
ON
ON
ON
ON ON
ON
ON ON
ON
ON
ON
ON
ON
ON ON
ON
ON ON
ON
ON
MOVEMENT
BLADE
RAISE LOWER
ANGLE
RIGHT
ANGLE
LEFT
RIGHT
EXTEND
RIGHT
RETRACT
LEFT
RETRACT SCOOP VEE
(DEFAULT)
STRAIGHT BLADE
R/VEE L/SCP R/VEE *
R/VEE *
WING
CONTROLLER MODE
CONTROLLER BUTTON
V / SCOOP
L/SCP * L/SCP R/VEE RAISE LOWER
ALL ALL
* NOTE - SEE BLADE MOVEMENT TEXT
FOR BUTTON OPERATION
EXTEND
LEFT
L/SCP *
ON
ON
ON
P/O CHECK
VALVE
P/O
CHECK
VALVE
P/O
CHECK
VALVE
P/O
CHECK
VALVE

Lit. No. 21857 June 15, 2003
20
ANGLE RIGHT – ELECTRICAL
COMPONENTS LOCATED FRONT LEFT OF VEHICLE
RIGHT SIDE PLOW LAMP
LEFT SIDE PLOW LAMP
VIO
PLOW ASSEMBLY
*REPRESENTATION
OF PRINTED
CIRCUIT BOARD
11
8
10
9
7
6
5
3
CONTROL*
1
2
ORN
11
10
9
7
8
5
6
TAN
BLK
BRN
GRN
RED
BLU
COIL CORD HARNESS
3
1
2
WHT
GRY
YEL
VIO
13
1
ORN/BLK
RED
1
13
12V BATTERY
LOCATED AT VEHICLE FRONT RIGHT
#6 RED
MTR RLY
10AFB
LOCATED UNDER DASH
BLU/ORN
LT BLU/ORN
BLK/WHT
LT BLU
LT GRN
BRN/RED
WHT/YEL
11
12
9
10
7
8
5
6
3
2
1
12
11
10
9
7
8
5
6
3
2
1
RED
BRN/GRN
#6 BLK
#6 RED
GRY
BLK/ORN
BRN BLK WHT
LOCATED AT GRILLE
PUMP MOTOR
#6 RED
#6 BLK
RED
BLK/ORN
S6 SOLENOID
LT BLU/ORN
BLU/ORN
BLK/WHT
WHT/YEL
LT BLU
LT GRN
IGNITION
1
8
12
11
9
10
6
7
5
2
3
8
12
11
9
10
6
7
5
2
3
1
2
3
11
2
3
S5 SOLENOID
S SOLENOID
S3 SOLENOID
S2 SOLENOID
S1 SOLENOID
BLADE MOVEMENT
ANGLE RIGHT
FASTON
BRN
BRN
VIO
WHT
M+

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
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.