Causes of failure: (1) The oil level of the hydraulic oil tank is too low;
Remedy: add hydraulic oil
Reasons for failure: (2) Hydraulic oil is not used according to season;
Remedy: usually apply 46 # hydraulic oil (or 68 #) without special replacement, consider using 32 # when the north is particularly 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
Causes of failure: (4) The oil seal of the active gear of the oil pump is damaged, and air enters the hydraulic system;
Remedy: replace the aging or damaged oil seal, O-ring
Causes of failure: (5) The oil pump inlet and outlet joints or elbow joint "O" -shaped seals are damaged, the elbow joint fastening bolts or inlet and outlet tubing nuts are not tightened, and air enters the hydraulic system
Remedy: replace the O-ring, tighten the bolt or nut at the joint
Causes of failure: (6) Internal leakage of oil pump and aging seal ring;
Remedy: replace the sealing ring
Causes of failure: (7) The end face of the oil pump or the end faces of the main and driven gear sleeves are worn or scratched, and the unevenness of the end faces of the two sleeves is excessive;
Remedy: replace the worn gear oil pump or oil pump bushing. When the wear is slight, smooth the end face on the flat plate. The allowable error of its unevenness is 0.03mm; the end face of the upper shaft sleeve is lower than the pump body and the upper plane (normal value is lower than 2.5 ~ 2.6mm). If it exceeds the tolerance, the lower shaft sleeve should be compensated with 0.1 ~ 0.2mm copper sheet. It should be installed on the rear sleeve
Causes of failure: (8) Internal leakage caused by incorrect assembly of internal parts of the oil pump;
Exclusion method: The unloading piece and the sealing ring must be installed in the oil chamber, and the two shaft sleeves can maintain balance. The elastic force of the guide wire should be able to twist the upper and lower shaft sleeves toward the driven gear at a slight angle at the same time, so that the machining planes of the two shaft sleeves of the main and driven gears closely fit; the unloading groove on the shaft sleeve must be equipped with a low pressure cavity Side, to eliminate the harmful dead volume generated when the gears are engaged; before pressing into the self-tightening oil seal, the surface should be coated with a layer of lubricating oil, and pay attention to the oil blocking edge toward the front cover, which cannot be reversed; before installing the pump cover, it must be Pour a small amount of hydraulic oil into the pump casing and turn the meshing gear by hand
Causes of failure: (9) "Left-handed" oil pump is installed with "right-handed", causing the skeleton oil seal to be broken;
Remedy: "Right-handed" pumps cannot be installed on "Left-handed" machines, otherwise the skeleton oil seal will be washed out;
Cause of failure: (10) The hydraulic oil is too dirty.
Remedy: clean the system and replace the hydraulic oil.
Cause of failure: (11) The filter of the pump is blocked by dirt and cannot play the role of oil filtering
Remedy: Use clean cleaning oil to remove dirt from the filter.
Causes of failure: (12) Insufficient oil level, the oil suction position is too high, and the oil suction pipe is exposed to the oil surface:
Remedy: Add oil to the oil mark and lower the oil suction position.
Causes of failure: (13) There is no paper pad on both sides of the pump body and pump cover; the pump body and pump cover are not sealed vertically:
Removal method: Inhale air when rotating: add paper pad between the pump body and the pump cover; the pump body is ground on the flat plate with emery, so that the vertical error of the pump body and the pump cover does not exceed 0.005mm, tighten the connection between the pump body and the pump cover , There must 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:
Remedy: Adjust the concentricity of the pump and motor coupling so that the error does not exceed 0.2mm.
Cause of failure: (15) The meshing precision of the pump gear is not enough:
Exclusion method: The gear grind precision of the grinding gear.
Reasons for failure: (16) The oil seal skeleton of the pump shaft has fallen off and the pump body is not sealed:
Remedy: replace the qualified pump shaft oil seal.
