TM 5-5420-280-10
0038 00
Pallet Electrical Troubleshooting (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
44. RCU WILL NOT LOWER WINCH WIRE ROPE (R18-H)
Step 1. Check that KY1 and KY21 hydraulic control valve solenoid LED
lights are lit when action button 2 is depressed.
If all 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
45. RCU WILL NOT LOWER LIFTING CYLINDERS (R2-H)
Step 1. Check that KY1 and KY16 hydraulic control valve solenoid LED
lights are lit when action button 2 is depressed.
a. If both lights are lit on control valve solenoids, check pressure
switch KF1 to see if damaged or out of adjustment. If damaged or
out of adjustment, notify field maintenance.
b. If pressure switch KF1 is operating and control valve solenoids
are lit, notify field maintenance.
Step 2. Check to see if one or more control valve solenoid LED lights are out
when action button 1 is depressed.
If light is out, notify field maintenance.
END OF TESTING
46. RCU WILL NOT RETRIEVE LOWER BRIDGE HALF (R17-H)
Step 1. Check that KY1 and KY5 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 only one of the control valve solenoid LED lights is
lit.
If only one light is lit, notify field maintenance.
END OF TESTING