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 2.
Open timer cover. Set BACKWASH switch to START and release. Watch knob in timer.
If knob rotates, go to step 3.
If knob does not rotate, go to step 4.
Step 3.
Shut down ROWPU. Refer to TM 10-4610-239-10. Shut down power. Refe to generator
r
manual. Refer to backwash pump assembly support diagram figure 3-12. Check continuity
point-to-point between test points A and B. If all checks indicate continuity except across
A1, repair backwash timer assembly. Refer to paragraph 3-24.
If any check through a wiring harness does not indicate continuity, repair wiring
harness. Refer to paragraph 3-39.
If any check through a cable does not indicate continuity, repair cable
assembly. Refer to paragraph 3-17.
Step 4.
Shut down ROWPU. Refer to TM 10-4610-239-10. Shut down power. Refer to generator
manual. Hold BACKWASH switch in STAIRT position. Refer to backwash pump assembly
support diagram figure 3-12. Check continuity point-to-point between test points C and D.
If there is no continuity through S2 or S 14, replace switch. Refer to paragraph
If there is no continuity through K2, repair motor controller. Refer to
If there is no continuity through Al, repair backwash timer. R fer to paragraph
e
If there is no continuity through a wiring harness, repair wiring harness. Refer
If there is no continuity through a cable, repair cable assembly. Refer to
3-64
