Fault causes: (1) the oil level of hydraulic oil tank is too low;
Troubleshooting: add hydraulic oil
Fault causes: (2) hydraulic oil is not used in season;
Troubleshooting: generally applicable 46\68\hydraulic oil (or 68\\) does not need special replacement, and 32 is considered to be used when it is extremely cold in the north in winter#
Fault cause: (3) the oil inlet pipe is seriously blocked by dirt;
Troubleshooting: remove the foreign matters in the pipe
Fault cause: (4) the oil seal of oil pump driving gear is damaged, and air enters the hydraulic system;
Troubleshooting: replace the aged or damaged oil seal and O-ring
Fault cause: (5) the "O" ring of oil pump inlet and outlet joints or elbow joints is damaged, the fastening bolts of elbow joints or the nuts of oil inlet and outlet pipes are not tightened, and air enters the hydraulic system;
Troubleshooting: replace the O-ring and tighten the bolts or nuts at the joint
Fault cause: (6) internal leakage of oil pump and aging of sealing ring;
Troubleshooting: replace the sealing ring
Fault cause: (7) the oil pump end face or the shaft sleeve end faces of the driving and driven gears are worn or scratched, and the unevenness of the two shaft sleeve end faces is out of tolerance;
Troubleshooting: replace the worn gear oil pump or oil pump shaft sleeve. When the wear is slight, grind the end face flat on the plate. The allowable unevenness error 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 it exceeds the tolerance, the lower shaft sleeve shall be added with 0.1~0.2mm copper sheet to compensate. During installation, it shall be installed on the rear shaft sleeve
Fault cause: (8) internal leakage caused by incorrect assembly of internal parts of oil pump;
Troubleshooting: the unloading plate and sealing ring must be installed into the oil chamber, and the two shaft sleeves can be balanced. The elastic force of the guide steel wire shall be able to twist the upper and lower shaft sleeves by a small angle towards the rotation direction of the driven gear at the same time, so that the two shaft sleeve processing planes of the driving gear and the driven gear fit closely; The unloading groove on the shaft sleeve must be installed at the side of the low-pressure cavity to eliminate the harmful dead volume caused by gear meshing; Before pressing the self tightening oil seal, apply a layer of lubricating oil on its surface, and pay attention to the oil blocking edge facing the front cover, and do not install it upside down; Before installing the pump cover, pour a small amount of hydraulic oil into the pump housing and rotate the meshing gear by hand
Fault cause: (9) "left" and "right" oil pumps were installed, causing the framework oil seal to be damaged;
Troubleshooting: the "right-hand" pump cannot be installed on the "left-hand" pump, otherwise the framework oil seal will be damaged;
Fault cause: (10) the hydraulic oil is too dirty.
Troubleshooting: clean the system and replace the hydraulic oil.
Fault cause: (11) the filter of the pump is blocked by dirt and cannot filter oil
Troubleshooting: use clean cleaning oil to remove dirt from the filter.
Fault cause: (12) insufficient oil level, high oil suction position, exposed oil surface of oil suction pipe:
Troubleshooting: add oil to the oil level and lower the oil suction position.
Fault cause: (13) there is no paper pad on both sides of the pump body and the pump cover; The pump body and pump cover are not sealed vertically:
Troubleshooting: inhale air during rotation: add a paper pad between the pump body and the pump cover; The pump body shall be ground on the flat plate with carborundum to ensure that the perpendicularity error between the pump body and the pump cover does not exceed 0.005mm. The connection between the pump body and the pump cover shall be fastened without leakage.
Fault cause: (14) the driving shaft of the pump is not concentric with the motor coupling, and there is twisted friction:
Troubleshooting: adjust the concentricity of the pump and motor coupling so that the error does not exceed 0.2mm.
Fault cause: (15) insufficient meshing accuracy of pump gear:
Troubleshooting: grind the gear to achieve gear meshing accuracy.
Fault cause: (16) the oil seal framework of the pump shaft falls off, and the pump body is not sealed:
Troubleshooting: replace the qualified pump shaft oil seal.
