Instruction 2111.80B 04/05 13
protects the pump against sedimentation build-up and damage due to freezing. The pump and bearings should
be thoroughly inspected at this time so that all necessary servicing may be done during the inactive period. If the
pump is to be out of service for more than one (1) month, CHICAGO PUMP recommends removing the
packing from the stuffing box. Shaft must be rotated for one minute monthly to insure proper distribution of
lubricant. Re-lubricate the pump in accordance with PRESTART-UP LUBRICATION instructions, page
9, prior to putting the unit back into service.
SECTION IV. GUIDE TO TROUBLE SHOOTING
Discounting the possibility of damage during transit, most field trouble is the result of a faulty installation or
misapplication. If the following points are checked, it is likely that the difficulty will be discovered and can be
remedied.
A. NO LIQUID DELIVERED
1. Pump is not primed.
2. Speed is too low, check voltage.
3. Discharge head is too high.
4. Suction lift is too high (over 15 ft.)-Check with gauges.
5. Impeller is completely plugged up.
6. Direction of rotation is incorrect.
7. Valve is closed.
B. INSUFFICIENT LIQUID IS DELIVERED
1. Air leaks are present in suction pipe or stuffing box.
2. Speed is too low, check voltage.
3. Discharge head is higher than anticipated.
4. Suction lift is too high (over 15 ft.) - Check with gauges.
5. Impeller is partially plugged.
6. There is not enough positive suction head for handling hot liquids.
7. Mechanical defects:
Wearing rings worn,
Impeller damaged,
Packing defective.
8. Direction of rotation is incorrect.
9. Valve is partially closed.
C. EXCESSIVE POWER CONSUMPTION
1. Speed is too high.
2. System head is lower than anticipated. Pumps deliver too much liquid.
3. Specific gravity of liquid is higher than anticipated. Check viscosity and specific gravity.
4. Mechanical defects:
Shaft bent,
Rotating elements binding,
Stuffing box too tight,
Wearing rings worn or rubbing.
5. Direction of rotation is incorrect.
6. Power factor is too low, check with wattmeter.
D. PUMP LOSES PRIME AFTER STARTING
1. Leak(s) present in suction line.
2. Water seal is plugged.
3. Suction lift is higher than anticipated (over 15 ft.).
4. Excessive air or vapor is present in liquid.
5. Insufficient NPSH Available.
NOTE: Check the pump speed with a tachometer. If speed is low, check the line voltage.
In cases where checking over the points outlined above does not disclose the trouble and this trouble has developed
before the pump has outlived the contract guarantee, CHICAGO PUMP COMPANY will send one of its engineers to
make an investigation on the basis of a written agreement that if the trouble proves to be a defect in the unit, no charge
will be made for the company's engineer, but if the trouble is due to faulty installation or conditions not in accordance with
those for which the pump is guaranteed, then the customer will pay for the engineer's service.
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