MQ41TDH — TROUBLESHOOTING (PUMP)
Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a breakdown, use the table shown for pump troubleshooting guide (Table 4)and the engine troubleshooting guide (Table 5). If the problem cannot be remedied, consult our company's business office or service plant.
TABLE 4 PUMP TROUBLESHOOTING
SYMPTOM | POSSIBLE PROBLEM | SOLUTION | |
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| Not enough priming water in the housing? | Add water. | |
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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. | |
Pump does not take on water. |
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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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| Too much distance between impeller and volute. | Adjust clearance by adding shims or replace impeller. | |
| Min. .006" - Max. .020" | ||
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| Water leaking out weep hole between pump and | Check condition of mechanical seal and gaskets, | |
| engine? | between pump end and engine housing. | |
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| Engine speed too low? | Increase throttle speed. | |
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Pump takes in water, little or no | Suction strainer partially plugged? | Clean strainer. | |
discharge. |
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Impeller/Volute worn? | Adjust clearance by adding shims or replace | ||
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| impeller/volute | |
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| Fittings/clamps are not sealed properly? | Tighten, replace or add clamp. (Keep extra seals on | |
| pump) | ||
Suction hose leaks at inlet. |
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| Hose diameter is too large? | Use smaller diameter hose or replace hose. | |
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Discharge does not stay on | Pressure too high? | Check pressure, add additional clamp. | |
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coupling. | Hose kinked or end blocked? | Check hose. | |
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| Impeller jammed or blocked? | Open pump cover and clean dirt and debris from inside | |
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| housing. | |
Impeller does not turn: pump is |
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Impeller and volute binding? | Adjust clearance by removing shim from behind | ||
hard to start. | |||
impeller. | |||
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| Defective engine? | See Hatz Diesel Engine Owner's Manual. | |
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