Lit. No. 27366, Rev. 01 February 15, 2008
68
TROUBLESHOOTING GUIDE
This test consists of trying all ten
snowplow functions and comparing
the snowplow reaction to the action
requested in the following table. The
table can help pinpoint
malfunctioning solenoid valves,
solenoid coils or motor relays and
blown fuses if only one component
is malfunctioning. If the snowplow
reaction for a given function is not
listed in the table, there may be relief
or check valves that are stuck open
or contaminated; there may be
missing or damaged O-rings or
backing rings on solenoid, relief or
check valves; there may be an
unanticipated malfunctioning
component; or there may be two or
more malfunctioning components. In
the last two cases (multiple or
unanticipated malfunctioning
components), use the specific
function hydraulic schematic and
carefully inspect each component in
the flow circuit. If contamination is
evident in more than one component,
the hydraulic unit, hoses and rams
must be completely disassembled,
inspected and cleaned.
1. Verify hydraulic hose installation
is correct. Refer to the Hose
Routing diagram.
2. Test all of the snowplow functions.
3. Perform Solenoid Coil Activation
Test (SCAT) first.
4. Inspect and clean or replace the
suspect component. Refer to the
System Overview – Hydraulic
Section.
5. Refer to the end of this guide for
inspection and adjustment of
relief valves.
IMPORTANT: When testing the
snowplow functions, be sure the
control is not in "float."
ACTION REQUESTED SNOWPLOW REACTION SUSPECT COMPONENT
Raises, then blade drops / Blade will not stay up • S3 Cartridge Valve
• F1 Fuse on Harness B
• F2 Fuse on Harness B
• S2 Coil
None
• Motor Relay
• F1 Fuse on Harness C
Raise
Raises very slowly, then drops slowly
• S8 Coil
• F1 Fuse on Harness B
Lower
None
• S3 Coil
HYDRAULIC SYSTEM TESTING
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