Repair method of forklift hydraulic pump failure

1. What is the fork hydraulic pump?

Forklift hydraulic pumps and hydraulic motors are energy conversion devices in hydraulic system accessories. The forklift hydraulic pump converts the mechanical energy of the motive rotational force into hydraulic energy, which is a forklift power element.

2.  what is the role of the forklift hydraulic pump?

The forklift hydraulic motor converts the rotational motion energy into the hydraulic mechanical energy of gear meshing, which is the actuator used to push the hydraulic cylinder. The hydraulic pumps used in hydraulic transmission rely on changes in the volume of the sealed working oil chamber to achieve oil absorption and discharge, so they are also called positive displacement forklift hydraulic pumps. Forklift hydraulic pumps can be divided into vane type, gear type, plunger type and other types. In terms of working principle, the forklift hydraulic pump is irreversible, which is mainly determined by the position of the forklift hydraulic pump's oil inlet and outlet. Any type of positive displacement forklift hydraulic pump can be used with a hydraulic motor. However, due to its different working conditions, in order to improve its performance, some measures have been taken in the structure.

3. common faults of forklift wave pressure pump

Common faults of forklift hydraulic pumps

1. The working fluid has deteriorated due to entering the dirt:

Dirt will cause wear and corrosion of parts, especially for precision-machined parts, they will scratch the inner wall of the rubber tube, oil seal ring and packing, and these things will cause more dirt to enter the system. It forms a vicious circle of damage.

2.Overheating.

Overheating will cause the oil to oxidize rapidly, and the oxidation will release insoluble resin, sludge and acids, etc., and the accumulation of these substances in the oil causes accelerated wear and corrosion of the parts, and they adhere to the surface of the finished parts. The parts will lose their original functions. Oil thinning due to overheating will also slow down the transmission.

4. Enter the air:

In addition to overheating when air enters the oil, a considerable amount of air will be dissolved in the oil under pressure. If about 10% of the compressed volume is dissolved air, foam will form when the pressure drops. When the working hydraulic cylinder returns to the oil under pressure, the oil with foam will form a "sponge" property. In addition, there are many bubbles in the oil, which will increase the total volume and cause oil spills in the fuel tank or oil reservoir.

Fourth, the repair method of the forklift hydraulic pump failure:

1. Disassemble the screws of the back cover of the hydraulic pump and remove the back cover;

2. Check the gear inside and whether the cylinder wall is severely worn;

3. Replace the copper repair kit in the hydraulic pump and replace the high pressure oil seal of the front shaft of the hydraulic pump;

4. After the replacement is completed, install it in the reverse order, and then install the vehicle to test and check the working conditions. It can be used after it is normal.

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