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| TROUBLESHOOTING |
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| TABLE 8. ENGINE TROUBLESHOOTING (Continued) | |||
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| SYMPTOM |
| POSSIBLE PROBLEM |
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| SOLUTION |
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| Operation not satisfactory |
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| Governor adjustment improper? |
| Adjust governor to correct lever. | |
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| Governor spring defective? |
| Clean or replace ignition. | |
| Rotational speed fluctuates. |
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| Fuel flow erratic? |
| Check fuel line. | |||
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| Air taken in through suction |
| Check suction line. | |
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| line? |
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| Recoil starter not working |
| Dust in rotating part? |
| Clean recoil starter assembly. | |
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| properly. |
| Spring spring failure? |
| Replace sprial spring. | |
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| TABLE 9. PUMP TROUBLESHOOTING | |||
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| SYMPTOM |
| POSSIBLE PROBLEM |
| SOLUTION | |
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| Not enough priming water in the housing? | Add water to suction chamber. | |||
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| Engine speed too low? |
| Increase throttle. | ||
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| Strainner plugged? |
| Clean strainer. | ||
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| Suction hose damaged? |
| Replace or repair hose, and clamps | ||
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| Air leak at suction port? |
| Check that fittings are tight and properly sealed. | |
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| Pump does not take on water. | Pump is located too high above water line? | Move pump closer to water. | |||
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| Debris collecting in pump housing? |
| Clean pump housing. | ||
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| Water leaking out weep hole between pump and | Check condition of mechanical seal and gaskets, | ||
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| engine? |
| between pump end and engine housing. | ||
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| Valves not seated correctly? |
| Check that valves are seated correctly. Pour water in | ||
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| in suction chamber to help seal valves. | |||
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| Pump does not prime correctly? |
| Check diaphragm for breaks or leaks. | ||
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| Pump takes in water, little or no | Engine speed too low? |
| Increase throttle speed. | ||
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| discharge. | Suction strainer partially plugged? |
| Clean strainer. | ||
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| Suction hose leaks at inlet. |
| Teflon Tape/Pipe Dope not used? |
| Apply teflon tape or pipe dope to NPT fittings. | |
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| Hose diameter is too large? |
| Use same diameter on suction/discharge ports. | |||
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| Discharge hose does not stay | Pressure too high? |
| Check pressure, add additional clamp. | ||
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| on coupling. | Hose kinked or end blocked? |
| Check hose. | ||
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PAGE 28 — MQD2H/3H DIAPHRAGM PUMPS — OPERATION AND PARTS MANUAL — REV. #6 (10/27/11)
