TM 10-4610-239-24
TM 08580B-24/3
Table 3-1. Direct Support Troubleshooting - Continued
Malfunction
Test or Inspection
Corrective Action
BACKWASH PUMP ASSEMBLY - Continued
1. PUMP ELECTRIC MOTOR FAILS TO START WHEN BACKWASH SWITCH IS SET TO START -
Continued
Step 14.
Shut down ROWPU. Refer to TM 10-4610-239-10. Shut down power. Refer to generator
manual. Refer to schematic diagram figure FO-3. Check continuity between motor
controller K2 terminals L1, L2, and L3 and receptacle connector J1 pins A, B, and C
respectively.
If all three measurements indicate continuity, repair motor controller K2. Refer
If all three measurements do not indicate continuity, repair wiring harness W5.
Refer to paragraph 3-39.
Step 15.
Shut down ROWPU. Refer to TM 10-4610-239-10. Shut down power. Refer to generator
manual. Remove backwash pump cable assembly from motor. Refer to paragraph 2-138.
Leave cable connected to receptacle connector J2. Refer to schematic diagram figure
end of cable.
If all three measurements do not indicate continuity, go to step 16.
If all three measurements indicate continuity, go to step 1 .
7
Step 16.
Disconnect backwash pump cable connector P2 from ROWPU. Refer to schematic
diagram figure FO-3. Check continuity between wire lugs on end of cable and P2-A, P2-B,
P2-C, and P2-D.
If all four measurements indicate continuity, replace receptacle connector J2.
Refer to paragraph 3-37.
If all four measurements do not indicate continuity, repair backwash pump
cable assembly. Refer to paragraph 3-17.
Step 17.
Refer to interconnect diagram figure FO-3. Check continuity betwe n wire lugs on end of
e
cable and junction box ground terminal El.
If there is no continuity between any wire lug and El, go to step 18.
If there is continuity between a wire lug and El, repair backwash pump electric motor. Refer
3-67
