Common faults and solutions of hydraulic pump

Hydraulic pump is a hydraulic system of power components, is driven by the engine or motor, sucked from the hydraulic tank, forming a pressure oil discharge, sent to the implementation of components of a component. Hydraulic pump according to the structure is divided into gear pump, piston pump, vane pump and screw pump. Hydraulic pump common fault and solution Fault reason: (1) hydraulic tank oil surface is too low; Remedy: add hydraulic oil Fault reason: (2) did not use hydraulic oil according to the season; Remedy: usually apply 46 # hydraulic oil (or 68 #) No special replacement is not required in the winter when the northern special cold to consider the use of 32 # causes of the malfunction: (3) into the pipeline was seriously blocked by dirt; Remedy: Remove the foreign body failure reasons: (4) Air into the hydraulic system; Remedy: Replace the aging or damaged oil seal, O-ring failure causes: (5) oil pump inlet and outlet joints or bent joints "O" ring damage, bending joints fastening bolts or Into and out of the tubing nut is not tight, the air into the hydraulic system; Remedy: replace the O-ring, tighten the bolt or nut joints Cause: (6) pump leakage, seal aging; Remedy: Replace the seal Failure reasons: (7) the end face of the pump or the main, driven gear shaft end wear or scratches, the two sets of end surface unevenness tolerance; Remedy: Replace worn gear pump or pump shaft sleeve, wear light The flat face grinding plate. 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 The sleeve should be installed on the sleeve after the cause of the malfunction: (8) internal parts of the pump assembly error caused by internal leakage; Remedy: Unloading film and the 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-resistant edge toward the front cover, can not be installed anti; Pour a small amount of hydraulic oil into the pump casing, and hand rotating the meshing gear (Editor: Li Juan) Recommended reading: fluid machinery free on behalf of mining services

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