TM 10-3930-641-34-1
HYDRAULIC SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7. OIL TEMPERATURE TOO HIGH (CONT)
Step 4. Oil viscosity too low.
Drain system and replace oil. (See LO 10-3930-641-12.)
Step 5. Test relief valve for low setting. (See page 7-44.)
Adjust relief valve. (See page 7-44.)
Step 6. Inspect pump for wear.
Replace/repair. (See page 7-5.)
Step 7. Inspect hydraulic cooler core for debris.
Clean core. (See TM-750-254.)
8. CONTROL SPOOLS FOR HYDRAULIC CONTROL VALVE DO NOT MOVE EASILY
Step 1. High temperature hydraulic oil indicator is on.
Allow hydraulic oil temperature to cool. (See Malfunction no. 7.)
Step 2. Check for foreign material in fluid.
Drain and flush system. (See LO 10-3930-641-12.)
Clean filters. (See page TM 10-3930-641-20.)
Replace hydraulic oil. (See LO 10-3930-641-12.)
Repair/replace and adjust. (See TM 10-3930-641-20.)
Step 4. Check the torque of fastening capscrews of valve assembly.
NOTE
Improper torque settings will cause the control valve body to twist.
Retorque all fastening capscrews. (See Appendix D.)
Step 5. Inspect lift or tilt spools.
Replace if bent or damaged. (See page 7-44.)
Step 6. Inspect spool return springs.
Replace springs. (See page 7-44.)
2-32