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Hydraulic Pump Malfunction - Common Faults And Troubleshooting Methods For Cutter Suction Dredgers

2019-11-01 17:18:43 Jason 5640

Hydraulic Pump Malfunction - Common Faults And Troubleshooting Methods For Cutter Suction Dredgers

Analysis and troubleshooting of common faults in hydraulic pumps


(A)Failure phenomenonNo Oil Supply, Insufficient Fluid Volume, Insufficient pressure


Fault analysis:

1. Motor steering is wrong

2. Suction tube or filter blockage

3. The axial clearance or radial clearance is too large

4. The joint leaks and mixes in the air.


Method of exclusion:

1. Check motor steering

2. Unblock the pipeline, clean the filter, and replace the new working medium

3. Check and replace the relevant parts

4. Tighten the screws at each joint to avoid leakage and prevent air from entering.

5. Correctly select the working medium to control the temperature rise.



(B) Failure phenomenon:  Severe Noise And Severe Fluctuations


Fault analysis: 

1. The suction pipe and filter are blocked or the filter capacity is small.

2. Air leakage in the seal of the suction pipe or air bubbles in the medium

3. The pump is not the same as the coupling

4. Low oil level

5. Low oil temperature or high viscosity

6. Pump bearing damage


Method of exclusion:

1. Clean the filter so that the suction pipe is unobstructed and the filter is properly selected.

2. Add some oil to the joint or seal, such as noise reduction.the joint can be tightened or the seal can be replaced; the return port should be the mouth should be below the oil level, and there must be a certain distance from the oil suction pipe.

3. Adjust the concentricity

4. Refueling fluid

5. Heat the oil to the proper temperature

6. Check (hand touch) pump bearing part temperature rise



(C) Fault phenomenon:  Pump Shaft Oil Seal Oil Leakage


Fault analysis: 

The liquid leakage of the oil leakage pipeline is too large, so that the pressure inside the pump rises above the oil sealing pressure value


Method of exclusion:

Check if the drain port on the pump body of the plunger pump is connected to the tank directly with a separate oil pipe. If it is found that the leakage pipes of several plunger pumps are connected in parallel to a common pipe of the same diameter and then connected to the fuel tank, or the drain pipe of the plunger pump is connected to the return pipe, it should be corrected. It is best to connect a pressure gauge to the pump leakage port to check the pressure in the pump body. The value should be less than 0.08Mpa.



Leader Dredger Company Information:

Mainly for international marketing and exporting for the Dredgers,pipeline,construction machinery etc.

Weifang Leader co isThe only Professional Chinese manufacture for the cutter suction dredger production which combine:Design and reserch,Production,export and after sale service.

The Chinese dredge manufacture who has many branch offices in Asia,Russia,Mid-East,Africa countries etc;

The Chinese manufacture who keep the biggest sale anualy for cutter suction dredgers.

Leader dredger,on the march to a world famous brand name,is your ideal choice for dredging machinery!