TM 5-5420-280-10
0037 00
Pallet Hydraulic Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
10. BOTTOM BRIDGE HALF WILL NOT MOVE ON LAUNCH BOOM (L16-H or R7-H)
Step 1. Check for malfunctioning control valve.
If control valve does not function, notify field maintenance.
Step 2. Check that rear pin wheel drive hydraulic motor rotates.
If hydraulic motor will not rotate, notify field maintenance.
Step 3. Check for malfunctioning stop cylinder.
If brake assembly will not hold or release, notify field maintenance.
Step 4. Check for damaged rear pin wheel drive assembly.
If rear pin wheel drive assembly is damaged, notify field
maintenance.
Step 5. Check for damaged launch beam pin wheel drive bracket or drive pins.
If pin wheel drive bracket or drive pins are damaged, notify field
maintenance.
END OF TESTING
11. SECONDARY BOOM CYLINDER WILL NOT RAISE OR LOWER (L9-H, L13-H, or R10H
and R14-H)
Step 1. Check if both limit switches are functional or if arm is bent or missing.
If either limit switch does not function or arm is bent or missing,
notify field maintenance.
Step 2. Check for malfunctioning control valve.
If control valve does not function, notify field maintenance.
Step 3. Check for damaged secondary boom cylinder.
If secondary boom cylinder is damaged, notify field maintenance.
Step 4. Check for bent or damaged secondary boom rollers or bracket.
If secondary boom rollers or bracket are bent or damaged, notify
field maintenance.
END OF TESTING
12. LOWER BRIDGE HALF WILL NOT MOVE TO COUPLING POSITION (L14-A, L15-A, or
R9-A)
Step 1. Perform malfunction 7 if launch boom will not lower or raise.
Step 2. Perform malfunction 9 if lower support boom cylinders will not
extend or retract.
Step 3. Refer to Electrical System Troubleshooting, WP 0038 00 and perform
RCU Will Not Move Lower Bridge Half to Coupling Position.
END OF TESTING
