Common faults and troubleshooting of hydraulic pumps

Fault reason: (1) hydraulic oil tank surface is too low;

Remedy: Add hydraulic oil

Failure reasons: (2) did not use the hydraulic oil by season;

Remedy: Usually apply 46 # hydraulic oil (or 68 #) does not need special replacement, the winter cold when considering the use of 32 #

Failure reasons: (3) into the pipeline was a serious blockage of dirt;

Remedy: Remove the foreign body tube

Failure reasons: (4) the oil pump gear seal damage, the air into the hydraulic system;

Remedy: Replace aged or damaged oil seal, O-ring

Fault reasons: (5) Oil pump inlet and outlet joints or bent joints "O" ring damage, bending joints fastening bolts or into the tubing nut is not tight, the air into the hydraulic system;

Remedy: Replace the O-ring, tighten the bolt or nut at the joint

Failure reasons: (6) pump leakage, sealing ring aging;

Remedy: Replace the seal

Failure reasons: (7) the end of the pump or the main, driven gear shaft end wear or scratches, the end of the two sets of unevenness of the surface roughness;

Remedy: Replace worn gear pump or oil pump sleeve, flat wear on the flat end face grinding. Its unevenness allows the error of 0.03mm; the lower end of the sleeve lower than the pump body, the upper plane (normal value is less than 2.5 ~ 2.6mm), such as ultra-poor under the sleeve plus 0.1 ~ 0.2mm copper to compensate, when installed Should be set after the sleeve on the sleeve

Fault reason: (8) internal pump assembly errors caused by internal leakage;

Remedy: Unloading film and seal ring must be installed into the oil chamber, the two bushing in order to maintain balance. The guide wire elastic force should be able to reverse the upper and lower sleeves toward the driven gear in the same direction at a slight angle, so that the two driven sleeves of the main and driven gears are in close contact with each other. The unloading groove on the sleeve must be equipped with a low pressure chamber Side to eliminate harmful occlusion volume generated when the gear meshing; pressed into the tight oil seal, the surface should be coated with a layer of lubricating oil, but also pay attention to the oil edge toward the front cover, can not be installed anti; Pour a small amount of hydraulic oil into the pump housing and rotate the gear by hand

Fault reason: (9) "L" install "right-handed" pump, causing damage to the oil seal;

Remedy: "Right-handed" pump can not be installed "L" machine, otherwise it will damage the oil seal;

Fault reason: (10) hydraulic oil is too dirty.

Remedy: Clean the system, change the hydraulic oil.

Failure reasons: (11) pump filter is blocked by dirt can not play the role of oil filter

Remedy: With a clean wash oil filter to remove dirt.

Failure reasons: (12) oil level is insufficient, the suction position is too high, the suction pipe exposed oil surface:

Remedy: Refuel to the oil level, lower oil absorption position.

Failure reasons: (13) There is no paper pad on both sides of the pump body and the pump cover; the pump body and the pump cover are not vertical sealing:

Remedy: Inhale air during rotation: add a paper pad between the pump body and the pump cover; grind the pump body on the flat plate with emery body so that the error between the pump body and the pump cover is no more than 0.005mm. Fasten the connection between the pump body and the pump cover , There should be no leakage.

Failure reasons: (14) pump shaft and motor coupling is not the heart, there is distortion friction:

Remedy: Adjust the pump and motor coupling concentricity, so that the error does not exceed 0.2mm.

Failure reasons: (15) gear meshing accuracy is not enough:

Remedy: The research gear to achieve gear meshing accuracy.

Failure reasons: (16) pump shaft skeleton off, the pump is not sealed:

Remedy: Replace qualified pump shaft seal.

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