Western Snowplows Midweight Series, Руководство механика

Страница: 79 / 104

Lit. No. 48163, Rev. 00 March 15, 2016
79
TROUBLESHOOTING
All malfunctions of a snowplow can be categorized
as structural, electrical or hydraulic. Structural
issues are generally related to the blade, A-frame,
lift frame and mount components, and are usually
easily identified by visual inspection. However,
electrical and hydraulic issues can be difficult
to trace.
Read and understand the Theory of Operation
section of this manual before attempting to
troubleshoot.
Because of the relative complexity of the snowplow
electrical and hydraulic systems, some conditions
must be met in order to develop valid tests. If the
listed conditions are not met, the procedure can
result in inaccurate results and wasted time.
Troubleshooting Procedure
1. Go to "Before You Begin" (next page)
and satisfy the listed conditions. These
conditions must be met before proceeding
to the troubleshooting tables and performing
any tests. In many cases, satisfying the listed
conditions alone solves the problem.
2. If a lighting problem exists, proceed to the
relevant troubleshooting tables for vehicle
headlamps, snowplow headlamps, snowplow
park/turn lamps, or snowplow DRLs. Each
table presents a list of basic test questions and
solutions to common problems.
3. If the problem is not related to the headlamps,
park/turn lamps or DRLs, skip the lighting
system troubleshooting pages and go to the
hydraulic system troubleshooting pages.
4. Follow along sequentially through the tables
and tests, referring to the Hydraulic & Electrical
Schematics and System Overview sections of
this manual as needed.
HOW TO USE THIS TROUBLESHOOTING GUIDE ELECTRICAL TESTING
Read and understand the electrical circuit
operation information in the Theory of Operation
section. A simple 12-volt (12V) test light with a
ground lead can be used for circuit testing in most
cases. The exception is the paired multiplex wiring,
which carries a low-level signal from the control to
the Plow Module. In this case, an ohmmeter may
be used to check continuity.
When directed to check for 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.