TM 9-2330-381-14
Table 3-1. Operator/Crew Troubleshooting Table - CONT
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
HYDRAULIC SYSTEM - CONT
Step 4.
Check for external leaks at hydraulic fittings/joints.
Refer to symptom 11 to continue checking for external leaks.
15.
PLATFORM SUSPENSION DRIFTS DOWN OR DROPS
Step 1.
Check for general hydraulic failures.
Refer to symptom 10 for general hydraulic failures.
Step 2.
Check for external leaks at hydraulic fittings/joints.
Refer to symptom 11 to continue checking for external leaks.
Step 3.
Check for evidence of leakage at suspension cylinder, line fracture valves, suspension shut-off and
isolation valves, suspension valves, gooseneck cylinders, and hydraulic gages.
If leaks are found, notify unit maintenance.
16.
SUSPENSION RIDES STIFF AND DOES NOT ADJUST FOR BUMPS/ROAD HAZARDS
Step 1.
Check for proper platform height over rough/rugged terrain.
Check platform height. Height should be 43 inches (109 cm). Make required adjustments to platform
Step 2.
Check that affected suspension isolation valve is open.
Open isolation valve, handles facing forward towards front of semitrailer (para. 2-6).
Step 3.
For highway driving or when semitrailer is coupled to tractor, gooseneck isolation and suspension
shut-off valve handles should be pushed inboard to RUN position.
Check that both gooseneck isolation and suspension shut-off valve handles are pushed inboard to
RUN position (para. 2-6).
Step 4.
Check for damage or mechanical binding at suspension arms and suspension cylinders and at
gooseneck pivot pin and gooseneck cylinders.
If damage is found, notify unit maintenance.
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