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2. TROUBLESHOOTING
※
Diagnose malfunction charts are arranged from most probable and simplest to verify, to least likely,
more difficult to verify. Remember the following steps when troubleshooting a problem :
Step 1. Operational check out procedure(See group 3 in section 1)
Step 2. Operational checks(In this group)
Step 3. Troubleshooting
Step 4. Tests and adjustments(See group 3)
Problem
No steering
No hydraulic functions
steering normal
Cause
Low oil level
Failed steering pump
Failed main pump drive
Stuck priority valve spool
Broken priority valve spring
Relief valve in steering valve stuck open.
Stuck open system relief valve
Locked safety valve
Plugged pilot line filter
Failed hydraulic pump
Low secondary pressure of RCV
Add recommended oil.
Remove and inspect return filter for metal
pump particles.
Do main pump flow test.
Remove and inspect priority valve spool.
Remove and inspect spring.
Do relief cartridge leakage test.
Replace relief valve.
Unlock safety valve.
Inspect and replace.
Remove and inspect the pump.
Check the pressure and replace if
necessary.
5-11
Remedy
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