Troubleshooting Malfunctions (Cont)
Test or Inspection
Test procedures for all retrieval cylinders are the same.
Step 3. Check for defective cylinders or holding valves. Install pressure gauge on test port on eight
valve bank. Operate cylinder in direction it will not work until relief valve engages
If pressure is correct, remove holding valves from cylinder and check for damage
Lift cylinder - Extend -
400 psi (2 758 kPa) (para 13-30.2)
- Retract - 2500 psi (17 238 kPa)
Tow cylinders- Extend -
300 psi (2 069 kPa) (para 13-30.4)
- Retract -
300 psi (2 069 kPa)
If holding valves are good, repair hydraulic cylinder (para 13-30.3 and 13-30.5).
If pressure is not correct, replace relief valve for cylinder in the direction it does
not work correctly.
If cylinder is still inoperative, replace or repair control valve.