Western Snowplows Midweight Series, Руководство механика

Страница: 100 / 104

Lit. No. 48163, Rev. 00 March 15, 2016
100
HYDRAULIC SYSTEM TEST
This test consists of trying all the plow functions
and comparing the plow reaction to the action
requested. The following table will help you
pinpoint a solenoid valve or poppet check valve
problem accurately if only one component is
malfunctioning.
If the plow reaction for a given function is not listed
in the table, the problem may be caused by a
crossover relief or poppet check valve that is stuck
open or contaminated, or by missing or damaged
O-rings or backing rings on a cartridge, crossover
relief or poppet check valve spool.
Another possibility is that there are two or more
malfunctioning components. In this case, 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 cylinders
must be completely disassembled, inspected and
cleaned.
1. Perform the Cartridge Coil Activation Test
first.
2. Verify that hydraulic hose installation is correct.
Action Requested Plow Reaction Possible Cause
Raise
None S3 not shifted
Angle left S2 stuck shifted
Lower None
S1 not shifted
S2 stuck shifted
S3 stuck shifted
Angle right
Angle left S3 stuck shifted
None S2 not shifted
Slow Poppet check valve not opening
Angle left
Angle right S3 not shifted
Raise S2 not shifted
None S2 and S3 not shifted
Slow Poppet check valve not opening
None (blade raised) Lowers S1 stuck shifted or has leaking internal check valve
None
Drifts right
S2 stuck shifted
Contamination, bad valve stem seat, or damaged O-rings in crossover relief valve
Drifts left
Poppet check valve open
Contamination, bad valve stem seat, or damaged O-rings in crossover relief valve
3. Test all of the plow functions. IMPORTANT:
When testing the plow functions, be sure the
control is not in FLOAT.
4. Inspect and clean or replace the suspected
component. Refer to the FloStat
®
Hydraulic
Unit Hydraulic Components diagram in the
Hydraulic System Overview section.
5. Refer to the following pages for instructions on
testing, inspection and adjustment of solenoid
cartridge valves, poppet check valves and
crossover relief valves.