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Hydraulic pump failure and how to repair it?
Source: | Author:Daniel | Published time: 2020-08-26 | 195 Views | Share:

Hydraulic pump failure, maintenance excavator, can not avoid three repairs and seven points of nutrition, because frequent small faults and abnormal phenomena need everyone's attention and treatment from time to time, and whether it is the excavator owner or the driver, do not want the core component of the excavator - hydraulic pump abnormal. On the one hand, the hydraulic pump is equivalent to the blood system of the human body for the excavator, on the other hand, the internal components of the hydraulic pump are complex and precise, and a slight inattention may cause greater failure. Today, I will teach you how to deal with the failure of hydraulic pumps.



Abnormal noise in the hydraulic pump:


Reason 1: The oil suction pipe is squeezed or the hydraulic oil suction filter element is blocked.


Treatment: Clean or replace the hydraulic oil suction filter element.


Reason 2: The oil suction pipe joint is loose, which causes the hydraulic pump to draw in a large amount of air.


Treatment: Retighten the fitting.


Reason 3: The viscosity of the hydraulic oil is too large, resulting in cavitation noise.


Treatment: Change to hydraulic oil of suitable viscosity.


Reason 4: The hydraulic pump itself has abnormal noise caused by wear.


Handling: Check and repair the hydraulic pump.


Insufficient displacement of hydraulic pump and slow excavator speed:


Reason 1: The engine speed does not meet the requirements, which will cause the displacement of the hydraulic pump to be insufficient.


Handling: Check and adjust the engine speed.


Reason 2: The viscosity of the hydraulic oil is too low, the hydraulic oil temperature is too high, and the oil level is too low will cause insufficient displacement of the hydraulic pump.


Treatment: Replace the hydraulic oil with high quality or suitable viscosity, and replace the insufficient hydraulic oil.


Reason 3: The hydraulic pump regulator adjustment bolt is loose.


Handling: Readjust the hydraulic pump displacement and lock the adjustment bolts.


Reason 4: In addition to the hydraulic pump, excessive pressure relief of distribution valves, cylinders, motors, etc. will also lead to insufficient displacement and slow speed.


Handling: Check and repair troubleshooting.


Reason 5: The hydraulic pump swash plate is stuck and the regulator is worn.


Handling: Repair or replacement of damaged parts.


The excavator pressure cannot be increased, and the excavator is weak:


Reason 1: The set pressure of the main relief valve is too low.


Treatment: Readjust the main relief valve pressure or replace the main relief valve.


Reason 2: In addition to the hydraulic pump, excessive pressure relief of distribution valves, cylinders, motors, etc. will also lead to insufficient pressure and weak excavators.


Handling: Check and repair troubleshooting.


Reason 3: The wear of the hydraulic pump plunger, cylinder block, distribution plate, etc. leads to excessive internal discharge of the hydraulic pump.


Handling: Repair or replacement of worn parts of hydraulic pumps


4

The hydraulic pump does not heat up normally


Reason 1: Heat generation caused by excessive internal discharge of the hydraulic pump.


Handling: Repair or replacement of hydraulic pumps.


Cause 2: Heat generation caused by wear or damage to hydraulic pump bearings.


Handling: Repair or replacement of worn parts of hydraulic pumps.


5

Summary: All in all, if there is a problem with the hydraulic pump, the state of the entire excavator will be greatly reduced, and the fault phenomenon caused by different reasons is also very different, so we must carefully compare the fault phenomenon above, so that we can accurately and quickly deal with the problem.


END

The experience content is for informational purposes only, and if you need to solve specific problems (especially in the fields of law, medicine, etc.), we recommend that you consult professionals in the relevant field in detail.

Author's statement: This experience is my original based on real experience, and I refuse to reprint it without permission.


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