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 5.
Push overload plunger on K2. Set ELEMENT CLEANING switch to START and release.
Check position of overload plunger.
If plunger stays in, go to step 6.
If plunger does not stay in, go to step 10.
Step 6.
Set ELEMENT CLEANING switch to START and release. Check position of indicating
plunger.
If indicating plunger is out, go to step 7.
If indicating plunger is in, go to step 8.
Step 7.
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 harness. Refer to
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 8.
Refer to schematic diagram figure FO-3. Check for 208 V ac at motor controller K2
between terminal pairs T1 and T2, and T3, and T1 and T3.
If 208 V ac is not present on all terminals pairs, go to step 9.
If 208 V ac is present on all terminal pairs, go to step 15.
Step 9.
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 terminal pairs, go to step 14.
If 208 V ac is present on all terminal 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 8.
If 208 V ac is not present on all terminal pairs after repeating step 8, go to step
10.
3-65
