Causes of failure: (1) The oil level of the hydraulic oil tank is too low;
Exclusion method: Add hydraulic oil
Causes of failure: (2) Hydraulic oil is not used according to the season;
Exclusion method: Usually suitable for 46# hydraulic oil (or 68#) without special replacement, consider using 32 when the northern cold is cold in winter#
Cause of failure: (3) The oil inlet pipe is seriously blocked by dirt;
Exclusion method: Remove the foreign body in the tube
Cause of failure: (4) The oil seal of the driving gear of the oil pump is damaged, and the air enters the hydraulic system;
Exclusion Method: Replace aging or damaged oil seals, O-rings
Cause of failure: (5) The oil pump inlet and outlet joints or the "O" seal ring of the elbow joint are damaged, the fastening bolts of the elbow joint or the nut of the inlet and outlet oil pipes are not tightened, and the air enters the hydraulic system;
Exclusion method: Replace the O-ring seal, tighten the bolt or nut at the joint
Causes of failure: (6) Internal leakage of oil pump and aging of sealing ring;
Exclusion method: Replace the seal
Cause of failure: (7) The end face of the oil pump or the end face of the main and driven gear sleeves is worn or scratched, and the unevenness of the end faces of the two shaft sleeves is out of tolerance;
Exclusion method: replace the worn gear oil pump or oil pump shaft sleeve, and grind the end face on the flat plate when the wear is slight. The allowable error of unevenness is 0.03mm, the end face of the upper shaft sleeve is lower than the pump body, and the upper plane (the normal value is lower than 2.5-2.6mm), if the deviation is out of tolerance, the lower shaft sleeve should be added 0.1-0.2mm copper sheet to compensate, and the rear axle sleeve should be installed when installed
Cause of failure: (8) Internal leakage caused by incorrect assembly of internal parts of the oil pump;
Exclusion method: The unloading plate and sealing ring must be installed into the oil cavity to keep the two axle sleeves balanced. The elastic force of the guide wire should be able to twist the upper and lower shaft sleeves towards the rotation direction of the driven gear at a slight angle at the same time, so that the processing planes of the two shaft sleeves of the main and driven gears are closely fitted; The unloading groove on the shaft sleeve must be installed on one side of the low-pressure cavity to eliminate the harmful closed dead volume generated when the gear is meshed; Before pressing into the self-tightening oil seal, it should be coated with a layer of lubricating oil on its surface, and it should also be noted that the oil blocking edge is facing the front cover, and it cannot be reversed; Before installing the pump cover, a small amount of hydraulic oil must be poured into the pump casing and the meshing gear should be rotated by hand
Cause of failure: (9) "left-handed" installed "right-handed" oil pump, resulting in damage to the skeleton oil seal;
Exclusion method: the "right-handed" pump cannot be installed on the "left-handed" machine, otherwise the skeleton oil seal will be damaged;
Cause of failure: (10) The hydraulic oil is too dirty.
Elimination method: Clean the system, replace the hydraulic oil.
Cause of failure: (11) The filter of the pump is blocked by dirt and cannot play the role of oil filtration
Removal method: Remove dirt from the filter with clean cleaning oil.
Cause of failure: (12) The oil level is insufficient, the oil suction position is too high, and the oil suction pipe is exposed:
Elimination method: refuel to the oil mark position, reduce the oil absorption position.
Cause of failure: (13) There is no paper pad on both sides of the pump body and the pump cover; The pump body is not sealed perpendicular to the pump cover:
Exclusion method: Suck in air when rotating: add paper pad between the pump body and the pump cover; The pump body is ground on the plate with corundum, so that the perpendicularity error between the pump body and the pump cover does not exceed 0.005mm, and the connection between the pump body and the pump cover is tightened, and there shall be no leakage.
Cause of failure: (14) The driving shaft of the pump is not concentric with the motor coupling, and there is twisting friction:
Exclusion method: Adjust the concentricity of the pump and the motor coupling so that its error does not exceed 0.2mm.
Cause of failure: (15) The meshing accuracy of the pump gear is not enough:
Exclusion method: The grinding gear achieves the gear meshing accuracy.
Cause of failure: (16) The oil seal skeleton of the pump shaft falls off, and the pump body is not sealed:
Exclusion method: Replace the oil seal of the qualified pump shaft.
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(2) Do not paint the inner wall of the oil tank to prevent precipitation in the oil.
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