TM 10-3930-641-34-1
HYDRAULIC SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
12. SPOOLS DO NOT RETURN TO NEUTRAL
Step 1. Inspect control linkage alinement.
Adjust control linkage. (See TM 10-3930-641-20.)
Step 2. Check torque on fastening capscrews in valve section.
NOTE
Improper torque settings will cause the valve body to twist out of alinement.
Retorque capscrews. (See Appendix D.)
Step 3. Inspect for bent spools.
Replace spools (See 7-44.)
Step 4. Check for broken springs.
Replace springs. (See page 7-44.)
Step 5. Check valve and system for foreign particles - drain system.
Replace hydraulic oil. (See LO 10-3930-641-12.)
13. NO MOVEMENT OR "BOUNCY" ACTION OF HYDRAULIC SYSTEM
Step 1. Check for air in the system.
Bleed air. (See TM 10-3930-641-20.)
Step 2. Test relief valve setting. (See page 7-44.)
Adjust/replace. (See page 7-44.)
Step 3. Check for full movement of spool
Adjust/replace. (See page 7-44.)
Step 4. Inspect valve body for internal cracks.
Replace. (See page 7-44.)
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