TM 5-5420-280-10
0038 00
Pallet Electrical Troubleshooting (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. RCU WILL NOT RETRACT WINCH WIRE ROPE (L3-A)
Step 1. Check that KY1 and KY21 hydraulic control valve solenoid LED
lights are lit when action button 1 is depressed.
a. If all lights are lit on control valve solenoids, check limit switch
KA5 to see if damaged or out of adjustment. If limit switch KA5 is
damaged or out of adjustment, notify field maintenance.
b. If limit switch KA5 is operating and control valve solenoid 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 1 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
6. RCU WILL NOT EXTEND SUPPORTING CYLINDERS (L4-A+M or L7-A)
NOTE
KY1 and KY8 control valve solenoids extend left
supporting cylinder, and KY1 and KY10 control valve
solenoids extend the 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 lit.
If only one light is lit, notify field maintenance.
END OF TESTING
7. RCU WILL NOT DEPLOY BRIDGE HALF (L5-A)
Step 1. Check that KY1 and KY4 hydraulic control valve solenoid LED lights
are lit when action button 1 is depressed.
a. If both lights are lit on control valve solenoids, check limit switch
KA1 to see if damaged or out of adjustment. If limit switch KA1 is
damaged or out of adjustment, notify field maintenance.
b. If limit switch KA1 is operating and control valve solenoid 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 1 is depressed.
If lights are out, notify field maintenance.
END OF TESTING
