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.