Lit. No. 28270, Rev. 00
July 1, 2005
64
TROUBLESHOOTING GUIDE
INTRODUCTION
This guide contains a series of
tables, diagrams, flowcharts, and
other information. When used
properly it helps the mechanic to
identify and repair malfunctioning
system components. Western
Products highly recommends using
the MVP
®
Electrical Tester as a
timesaving tool for electrical system
diagnosis. When using this tester,
refer to the supplied instruction
manual.
All malfunctions of the MVP
snowplow can be categorized as
mechanical, electrical or hydraulic.
Mechanical issues are generally
related to the blade wings, T-frame,
lift frame and mount components and
are usually identified by visual
inspection. However, electrical and
hydraulic issues can be difficult to
trace to the component level, and
that is the purpose of this
troubleshooting guide.
Read and understand the Theory
of Operation before attempting
troubleshooting.
Because of the relative complexity of
the MVP snowplow electrical and
hydraulic systems, some conditions
must be eliminated in order to
develop valid tests. These conditions
are listed before the tables or
flowcharts and must be satisfied
before proceeding.
If the listed conditions are not met,
the procedure can result in
inaccurate results and wasted time.
In many cases, satisfying the listed
conditions alone solves the problem.
1. Go to the beginning of the
Troubleshooting Tables section
(next page), and satisfy the ten
listed conditions. These
conditions
must
be met before
proceeding into the table or to
any subsequent test.
2. If having a lighting problem,
proceed to the Headlamp
Troubleshooting tables for a list
of basic test questions and
solutions to common problems.
3. If still having problems, go to the
General Diagnostic table. Locate
the condition in the table that
best describes the problem and
check possible causes and
actions in the order listed.
4. Proceed to a service procedure,
another condition, or a specific
test as directed. Some tests use
a flowchart format. To use the
flowcharts, first satisfy any listed
conditions at the top of the page.
Then begin at the upper left
square and proceed as directed.
5. Follow along sequentially
through the tables and tests,
referring to the Hydraulic &
Electrical Schematics and
System Overview sections as
needed. Eventually the problem
is identified at the component
level.
ELECTRICAL TESTING
Read and understand the section
describing electrical circuit operation
in the Theory of Operation section. A
simple 12V test light with a ground
lead can be used for circuit testing.
When directed to check for 12 volts
(12V), ground the test lamp lead and
probe the terminal. When asked to
check for ground, attach the test
lamp lead to +12V and probe the
terminal.
NOTE: 12V is a nominal value. If
using a voltmeter, actual voltage
will vary with the vehicle and
presence of loads in tested
circuits. Continuity alone does not
guarantee a good circuit. Poor
connectors or damaged wires may
have continuity but be unable to
carry sufficient current.
HOW TO USE THE TROUBLESHOOTING GUIDE
