Symptom 1: pump not working
Common reasons: packing too tight or between the impeller and the pump by debris accumulation and plug; pump shaft, bearing, anti-leakage ring rust live; pump shaft serious bending.
Elimination methods: Relax the packing, dredge the water tank; remove the pump body to remove debris, rust; remove the pump shaft correction or replacement of a new shaft.
Symptom # 2: insufficient flow
Causes: most are suction pipe leakage, end valve leakage; water inlet plug; bottom valve into the water depth is insufficient; pump speed is too low; sealing ring or impeller wear too much; high water intake and so on.
Elimination methods: check the suction pipe and the bottom valve, block the leak source, clean the mud or plug at the intake, the bottom valve into the water depth must be greater than 1.5 times the diameter of the intake pipe, increase the bottom valve into the water depth; Check the power supply voltage, increase the pump speed, replace the seal ring or impeller; lower the pump installation position, or replace the high-lift pump.
Symptom 3: unable to absorb water
Cause: there is air in the pump body or gas in the intake pipe, or the bottom valve closed not tight, filling water dissatisfaction, serious leakage of vacuum pump packing, gate valve or flap door closed not strictly.
How to rule it out:
1.First the water pressure up, and then the pump body filled with water, and then boot. At the same time check whether the valve is tight, pipeline, joint gas leakage phenomenon, if found gas leakage, remove the joint at the place coated with oil or paint, and tighten the screw.
2.Check the oil seal ring of the pump shaft, if wear is serious should replace new parts.
3.Water or air leakage in the pipeline. The nut may not be screwed tight when it is installed. If leakage is not serious, you can leak or leak in the place of the smear of cement, or coated with bitumen mixed with cement slurry. For temporary repairs, apply wet mud or soft soap. If leakage in the joint, you can use a wrench to tighten the nut, if serious leakage must be re-disassembled, replacement of the cracked pipe; lower the head, the pump mouth into the water 0.5 m.
Symptom 4: water pump does not come out of the water
Causes: pump body and suction pipe not filled with water; dynamic water level below the pump filter pipe; suction pipe rupture.
Removal methods: remove the bottom valve failure, fill the water, lower the pump installation position, so that the filter pipe in the dynamic water level, or the dynamic water level up the filter pipe to pump water, repair or replace the suction pipe.
Symptom 5: pump body vibration or noise
Causes: pump installation is not strong or pump installation is too high; motor ball bearing damage; pump spindle bending or with the motor spindle is not the same center, not parallel, and so on.
Treatment: install pump or lower the installation height of the pump; replace the motor ball bearing; correct the bending of the pump spindle or adjust the pump and motor relative position.
Symptom 6: excessive power consumption
Causes: pump speed is too high; pump spindle bending or pump spindle and motor spindle is not the same center or parallel; the selection of pump lift is not appropriate; pump suction sand or blockage; motor ball bearing damage.
Treatment: check the circuit voltage, reduce the pump speed; adjust the pump spindle or pump and motor relative position; select the appropriate head of the pump; clean up the sand or plug; replace the motor ball bearing.
Symptom 7: drive shaft or motor bearing overheating
Cause: lack of lubricating oil or bearing rupture.
Treatment: Add Lube oil or change bearing.
These are the common causes of pump“Symptoms”, not all the reasons, in practice to deal with the fault, but also because according to specific problems, actual analysis, should follow the principle of first outside, not blind operation.
In the analysis of pump failure, we must also learn the use of the universal meter and Megohm meter.
ge considerations
1、If the voltage or current measured can not be estimated in advance, it should first dial to the highest range gear measurement once, and then gradually reduce the range to the appropriate location as appropriate. After the measurement, the range switch should be set to the highest voltage block, and turn off the power.
2、When measuring voltage, the digital multimeter should be connected in parallel with the circuit to be measured; when measuring current, it should be connected in series with the circuit to be measured.
3、The display screen will display“000” when the AC voltage bar is misused to measure the DC voltage or the DC voltage bar is misused to measure the AC voltage.
4、Do not change the measuring range when measuring high voltage (220V or above) or high current (0.5 A or above) to prevent arcing and burning of switch contacts.
5、When“Batt” or“LOW BAT” is displayed, the battery voltage is lower than the operating voltage.
