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
2. PUMP ELECTRIC MOTOR FAILS TO START WHEN ELEMENT CLEANING SWITCH IS SET TO START
- Continued
Step 4.
Set ELEMENT CLEANING switch to START and release. Check position of indicating
plunger.
If indicating plunger is out, go to step 5.
If indicating plunger is in, go to step 6.
Step 5.
Shut down ROWPU. Refer to TM 10-4610-239-10. Shut down power. Refer to generator
manual. Refer to backwash pump assembly support diagram figure 3-12. Check continuity
point-to-point between test points E and F.
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
If there is no continuity through motor controller :K2, repair motor controller.
Refer to paragraph 3-47.
Step 6.
Refer to schematic diagram figure FO-3. Check for 208 V ac at motor controller K2
between terminal pairs T1 and T2, T2 and T'3, and T1 and T3.
If 208 V ac is not present on all terminal pairs, go to step 7.
If 208 V ac is present on all terminal pairs, go to step 13.
Step 7.
Refer to schematic diagram figure FO-3. Check for 208 V ac at motor controller K2
between terminal pairs on the top screw of each heater; left to center, center to right, and
left to right.
If 208 V ac is not present on all terminals pairs, go to step 12.
If 208 V ac is present on all terminals pairs, shut down ROWPU. Refer to TM
10-4610-239-10. Shut down power. Refer to generator manual. Remove six
screws and three heaters. Replace heaters that have damaged elements. Start
ROWPU. Refer to TM 10-4610-239-10. Repeat step 6.
If 208 V ac is not present on all terminal pairs after repeating step 6, go to step
8.
Step 8.
Shut down ROWPU. Refer to TM 10-4610-239-10. Shut down power. Refer to generator
manual. Check for short circuits between junction box ground terminal El and motor
controller K2 terminals T1, T2, and T3.
If any motor controller terminal is shorted to ground terminal El, go to step 9.
3-70
