TM 5-5420-280-10
0038 00
Pallet Electrical Troubleshooting (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
8. RCU WILL NOT LOWER LAUNCH BOOM TO LAUNCH POSITION (L6-A)
Step 1. Check that KY1 and KY18 hydraulic control valve solenoid LED
lights are lit when action button 1 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 is depressed.
If light is out, notify field maintenance.
END OF TESTING
9. RCU WILL NOT MOVE LOWER BRIDGE HALF (L8-AA)
Step 1. Check that KY1, KY4, and KY23 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
KA2 to see if damaged or out of adjustment. If limit switch KA2 is
damaged or out of adjustment, notify field maintenance.
b. If limit switch KA2 is operating and control valve solenoid LED
light is 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
10. RCU WILL NOT RAISE SECONDARY BOOM (L9-H)
Step 1. Check that KY1 and KY14 hydraulic control valve solenoid LED
lights are lit when action button 1 is depressed.
If both lights are lit on control valve solenoids, notify field
maintenance.
Step 2. Check to see if only one control valve solenoid LED lights is lit.
If only one light is lit, notify field maintenance.
END OF TESTING
