Gear oil pump insufficient or no oil pressure phenomenon analysis

Gear pump in use, often occur insufficient oil, or no oil pressure phenomenon. We do the following analysis of this failure to facilitate the troubleshooting of gear pump and maintenance. Phenomenon: (1) Slow lifting of working device, trembling or failing to improve when lifting; (2) Air bubbles in fuel tank or tubing; (3) Sound of "jack and jack" when hydraulic system is raised; (4) The device can be upgraded, working for a period of time after the oil temperature is raised, the slow increase or can not be improved; (5) light load can be improved, heavy load can not be improved. Gear oil pump failure reasons: (1) hydraulic oil tank surface is too low; (2) did not use the hydraulic oil according to the season; (3) into the pipeline was blocked by dirt; (4) oil pump gear damage, air into the hydraulic system; (5) oil pump inlet and outlet joints or bent joints "O" ring damage, bending joints or bolts into or out of the nut is not tight, the air into the hydraulic system; (6) pump leakage, sealing Circle aging; (7) the end face of the pump or the main, driven gear shaft end wear or scratches, two sets of end surface roughness unevenness; (8) internal pump assembly errors caused by internal leakage; "Right-handed" pump, causing damage to the oil seal; (10) hydraulic oil is too dirty. Gear pump troubleshooting: (1) according to the season to add or replace the required grade of oil to the required oil surface. Take out the foreign matter in the tubing and tighten the bolt or nut at the joint. (2) Replace the aged or damaged skeleton oil seal or "O" shaped sealing rubber ring. (3) Replace the worn gear oil pump or oil pump sleeve Flatten the face on the flatbed. Its unevenness allow error of 0.03mm; the end of the upper sleeve lower than the plane of the pump body (normal value less than 2.5 ~ 2.6mm), such as ultra-poor should be in the next shaft sleeve plus 0.1 ~ 0.2mm copper to compensate, when installed Should be set in the rear sleeve on the load; (4) unloading film and the seal ring must be installed in the oil chamber, the two bushing in order to maintain balance. (5) The guide wire elastic force should be able to reverse the rotation of the upper and lower sleeves toward the driven gear at a slight angle so that both the main and driven gear shafts (6) unloading trough on the sleeve must be installed in the low-pressure chamber side to eliminate the gear meshing harmful dead volume; (7) pressed into the tight oil seal, should be at The surface coated with a layer of lubricant, but also pay attention to the oil-resistant edge toward the front cover, can not be installed anti-; (8) "right-handed" pump can not be installed in the " Before installing the pump cover, pour a small amount of oil into the pump housing and rotate the gear with hand; (10) Before installing the oil pump cover without tightening the bolts, check the clearance between the pump cover and the pump body, 0.6mm, if the gap is too small, should be replaced by large seals and pressure relief parts. After the hydraulic pump is installed, it should be flexible and free from jamming.

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