TM 10-4610-232-34
Table 2-1. Direct Support Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
9. High pressure pump runs but the pilot light does not come on. Light test okay, (Ref. Schematic diagram FO-1, sheet 6,
schematic line 637).
Shut down ROWPU and generator. Refer to electrical drawing in Appendix D and remove wire #2B form PL11 (REF:
Interconnection diagram FO-2, Sheet 11). Check continuity, point-to-point, from MS8-11M (REF: Interconnection
diagram FO-2, Sheet 10) (wire #258) to PL11 (wire #258). Check continuity, point-to-point, from transformer T1(X2)
(REF: Interconnection diagram FO-2, Sheet 10) to wire #2B on PL11.
(a) Repair any loose or damaged wire (para. 2-20).
(b) Replace relay LTK2 (REF: Interconnection diagram FO-2, Sheet 7) if its contact is open (para. 2-22).
(c) Replace pilot light, PL11, if the above checks are okay (para. 2-22).
STARTER OVERLOAD HEATERS.
Starter overload heaters continually burn out. Shut down ROWPU and the generator. Refer to electrical drawings in
Appendix D and locate the problem motor in the drawings and check the power cables from the starter to the motor for
damage or loose connections. Check the motor for high resistance in the windings. The problem is related to high
current draw.
(a) Repair any loose or damaged wires (para. 2-20).
(b) Replace any damaged terminals in the control panel (para. 2-25).
(c) Repair any damaged cables or connections (para. 2-18,2-20,2-88 and 2-33).
(d) Replace any motor with too high resistance.
WARNING
Electrical high voltage can cause serious injury or death. Some tests performed in
troubleshooting require power to be connected. Always take proper measure to ensure
p e r s o n a l s a f e t y .
NOTE
Ensure that all circuit breakers are set before troubleshooting.
1.
Distribution pump will not run. (Ref. Schematic diagram FO-1, sheet 8, schematic lines 832-637 control; and Schematic
diagram FO-1, sheet 5, schematic lines 524-529, power).
Step 1. Shut down the ROWPU. Open the control panel. Check that the overload reset button on MS2 (REF:
Interconnection diagram FO-2, Sheet 10) is in by pushing it.
(a) If the reset button is in, go to step 3.
(b) If the button is out and will not reset, replace the overload heaters on MS2. Refer to para. 2-25 and then
go to step 2.
(c) If the reset button is out but resets when pushed, adjust the door reset assembly for MS2. Refer to
para. 2-24 and then go to step 2.
Step 2. Check each lead 2T1, 2T2 and 2T3 from MS2 to J19 (REF: Interconnection diagram FO-2, Sheet 16) for
damage and tightness.
(a) Repair any loose or damaged wires (para. 2-20).
(b) Replace/repair connector J29 if damaged (para. 2-21).
(c) Replace any damaged terminals (para. 2-25).
Step 3. Refer to the operator’s manual and power up the control panel. Turn the selector switch on the distribution
pump on. Push the distribution pump on switch at the back door. Watch the indicating plunger on MS2. It
should go in and stay in, which indicates the control circuits are working properly.
(a) If the distribution pump “power on” light at the back door is on, but the MS2 indicating plunger did not
go in, go to step 6.
Change 1
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