TM 5-5420-280-10
0038 00
Pallet Electrical Troubleshooting (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
14.
RCU WILL NOT OPERATE LIFTING CYLINDERS (L14-A)
Step 1. Check that KY1, KY17, and KY20 hydraulic control valve solenoid
LED lights are lit when action button 1 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.
If only one or two lights are lit, notify field maintenance.
END OF TESTING
15.
RCU WILL NOT LOWER SECONDARY BOOM (L13-H)
Step 1. Check that KY1 and KY15 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
KA6 to see if damaged or out of adjustment. If limit switch KA6 is
damaged or out of adjustment, notify field maintenance.
b. If limit switch KA6 is operating and control valve solenoid LED
lights are lit, notify field maintenance.
Step 2. Check to see if only one light is lit when action button 1 is
depressed.
If light is out, notify field maintenance.
END OF TESTING
16.
RCU WILL NOT LIFT LAUNCH BOOM (L14-A)
Step 1. Check that KY1 and KY17 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