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 TM 55-1905-220-14-3
Table 3-86. Steering System - Hydraulic Directional Control Valve Troubleshooting.
NOTE
Refer to paragraph 3-208 for all maintenance procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
Erratic Pressure.
Step 1.
Check for foreign matter in system.
Drain, flush and refill system with clean fluid.
Step 2.
Inspect for worn spool or cover(s).
Replace spool or cover(s).
Step 3.
Check for spool sticking in body or cover.
Clean spool. Remove burrs by light lapping.
Check freedom of movement on reassembly. Replace if necessary.
2.
Low pressure or no pressure.
Step 1.
Check for plugged balance hole in spool.
Remove spool and clean out. If necessary, drain system and refill with clean fluid.
3.
Excessive noise or chatter.
Step 1.
Check for high oil velocity through valve.
Check system.
Step 2.
Check for distorted spring.
Replace spring.
Step 3.
Check for worn spool or cover(s).
Replace spool cover(s).
3-236
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