TM 5-5420-280-10
0038 00
Pallet Electrical Troubleshooting (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Malfunctions 27 through 48 are performed in bridge
retrieval sequence.
27. RCU WILL NOT EXTEND SUPPORTING CYLINDERS (R1-M and R2-H)
NOTE
KY1 and KY8 control valve solenoids
extend left supporting cylinder and KY1
and KY10 control valve solenoids extend
right supporting cylinder.
Step 1. Check that KY1 and either KY8 or KY10 hydraulic control valve
solenoid LED lights are lit when action button 1 or 2 is depressed.
If both lights are lit on control valve solenoids, notify field
maintenance.
Step 2. Check to see if one or more control valve solenoid LED lights are out
when action button 1 or 2 is depressed.
If light is out, notify field maintenance.
END OF TESTING
28. RCU WILL NOT EXTEND BRIDGE CRADLE TO RETRIEVAL POSITION (R3-H)
Step 1. Check that KY1 and KY13 hydraulic control valve solenoid LED
lights are lit when action button 2 is depressed.
If both lights are lit on control valve solenoids, notify field
maintenance.
Step 2. Check to see if one or more control valve solenoid LED lights are out
when action button 2 is depressed.
If light is out, notify field maintenance.
Step 3. Check for loose winch relays AD2, AD3, and AD4 located in electrical
box.
Push relays AD2, AD3, and AD4 into receptacles. Refer to WP 0007 00.
END OF TESTING