TM 9-2330-381-14
4-13. TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
HYDRAULIC SYSTEM - CONT
20.
PLATFORM SUSPENSION WILL NOT ADJUST OR ADJUSTMENTS ARE SLUGGISH - CONT
Step 6.
Check for leaking or damaged hydraulic cylinder.
If cylinder is damaged, remove and replace suspension hydraulic cylinder (para. 4-41).
If cylinder is leaking, notify DS maintenance.
21.
PLATFORM SUSPENSION DRIFTS DOWN OR DROPS
Step 1.
Check for general hydraulic failures.
Refer to symptom 16 for general hydraulic failures.
Step 2.
Check for external leaks at hydraulic fittings/joints.
Refer to symptom 16 for checking external leaks.
Step 3.
Check for evidence of leakage at suspension cylinder, line fracture valves, suspension isolation
valves, suspension valves, gooseneck cylinders, and hydraulic gages.
If components are damaged, remove and replace components as required.
If cylinders are leaking, notify DS maintenance.
Step 4.
Check drift between gooseneck cylinders and front suspension cylinders while gooseneck isolation
valve is in ADJUST mode only.
If gooseneck cylinders extend about 0.25 - 0.5 inch (0.6 - 1.2 cm) at the same rate as suspension
cylinders retract, gooseneck isolation valve may be leaking internally. Remove gooseneck isolation
valve and check and replace parts found defective (para. 4-84).
4-38
