6. IMPROPER GOVERNOR OPERATION. (Model US636HCCD-1)

5. IMPROPER GOVERNOR SYSTEM OPERATION. (Model 609-C)

7. NO OR LOW SUCTION OR DISCHARGE PRESSURE. (Continued) - TM-10-4320-344-24_456

TM-10-4320-344-24 Pump Assembly Water 600 GPM Model 609-A (NSN 4320-01-184-7494) Model 609-C (NSN 4320-01-261-6470) Model US636HCCD-1 Manual
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TM 10-4320-344-24 Table 3-1. Direct Support Troubleshooting Table. (Continued) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 5. IMPROPER GOVERNOR SYSTEM OPERATION. (Model 609-C) (Continued) Step 7. Disconnect cable from governor control module. Using multimeter, check for governor actuator output signal between pins N and M. Signal should be a positive DC voltage which changes in magnitude when auto throttle rheostat, R4, is turned. a. If signal is not present replace governor control module (paragraph 2 . 16 . 3 2 ). b. If signal is present replace governor actuator (paragraph 3.8.7). c . Replace pressure control module (paragraph 2.16.31). 6. IMPROPER GOVERNOR OPERATION. (Model US636HCCD-1) Step 1. Check and see if governor linkage is stuck, loose or out of adjustment. Adjust or replace governor linkage as necessary (paragraph 3.8.8). Step 2. Check for proper governor adjustment. a . Adjust governor (paragraph 3.8.8). b . Replace governor (paragraph 3.8.8). 7. NO OR LOW SUCTION OR DISCHARGE PRESSURE. Step Step Step 1. Check and see if governor linkage is stuck, loose or out of adjustment. (All pumping units) Adjust or replace governor linkage as necessary (paragraph 3 . 8 . 6 / 3 . 8 . 7 / 3 . 8 . 8 ) . 2. Disconnect 10 pin connector from governor control box. Turn power switch to "ON" position. Using multimeter set to 20 vdc measure voltage between pins A (+) and C (-). (Model 609-A a. If voltage is 12 vdc go to step 4. b. If voltage is not 12 vdc go to step 3. 3. Using multimeter set to 200 ohm scale, check for continuity between A (+) to A (+) and C (-) to D (-). (Model 609-A) a. If reading is more than 1 ohm repair or replace wires as necessary (paragraph 2.17). b . If reading is less than 1 ohm go to step 4. Step 4. Using multimeter set to 200 ohm scale, (-) to D (-) and A (+) to B (+). check for continuity between D (Model 609-A) a. If reading is more than 1 ohm repair or replace wires as necessary (paragraph 2.17). b. If reading is less than 1 ohm refer to wiring diagram (Appendix F) for further fault isolation. 3-5

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