TM 5-5420-280-10
0038 00
Pallet Electrical Troubleshooting (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
38. RCU WILL NOT LIFT LAUNCH BOOM (R11-A)
Step 1. Check that KY1 and KY17 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 lights are out when action button 2 is
depressed.
If light is out, notify field maintenance.
END OF TESTING
39. RCU WILL NOT WINCH-IN WIRE ROPE (R12-A and R13-A)
Step 1. Check that KY1 and KY21 hydraulic control valve solenoid LED
lights are lit when action button 2 is depressed.
a. If all lights are lit on control valve solenoids, check limit switch
KA5 for damage or out of adjustment. If damaged or out of
adjustment, notify field maintenance.
b. If limit switch KA5 is operating and control valve solenoid LED
lights are lit, 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
END OF TESTING
40. RCU WILL NOT RETRIEVE LOWER BRIDGE HALF (R13-A)
Step 1. Check that KY1, KY5, and KY7 hydraulic control valve solenoid
LED lights are lit when action button 2 is depressed.
a. If all lights are lit on control valve solenoids, check limit switch
KA1 and KA2 to see if damaged or out of adjustment. If limit
switches KA1 and KA2 are damaged or out of adjustment, notify
field maintenance.
b. If limit switches KA1 and KA2 are operating and control valve
solenoid LED lights are lit, 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.
END OF TESTING
