Hydraulic gear pump failure ten Remedy


(1) unloading tank must be installed in the sleeve on the side of the low pressure chamber to eliminate harmful dead volume when closing gear,

(2) Before pressed into self-tight seal, should be coated with a layer of lubricant on the surface, but also pay attention to the resistance of the oil toward the edge of the front cover, can not hold against,

(3) “right-handed” pump can not be installed in the “L” machine, otherwise it will punch a bad seal,

(4) Before loading the pump cover, pour a small amount of oil required to pump housing, and turned by hand gear,

(5) Before the gear pump cover is not installed, tighten the bolts, check the clearance between the pump cover and pump, is between 0.3 ~ 0.6mm, if the gap is too small, you should replace the big ring and relief items. Hydraulic pump installed, should be flexible rotation without catching phenomenon.

(6) according to the season to add or replace grades of oil to meet the requirements of the provisions of the oil at the surface. Remove foreign object inside the tubing, tighten the bolt or nut joints,

(7) the replacement of worn gear pump or pump sleeve, slight wear at the flat end mill will smooth its roughness tolerance 0.03mm, the sleeve on the end face of the pump below the plane (normal is less than 2.5 to 2.6 mm), such as the ultra-poor should be added in the next 0.1 ~ 0.2mm copper sleeve to compensate, the installation should be put into the sleeve at the rear axle,

(8) unloading pieces and sealing ring must be installed in the inlet chamber, two sleeves in order to maintain balance. Unloading piece seal ring should have a preload amount of 0.5mm,

(9) the replacement of aging or damaged oil seal or “O” ring gasket,

(10) while the guide wire should be able to stretch the upper, lower sleeve toward the rotational direction of the driven gear by a small angle of twist, so that the main, two driven gear sleeve machining plane close fit

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