In front bucket loader working, we often meet the hydraulic system of the movable arm ascending weakness (slow) or turning to flip to, want to solve this problem, we will be first to analyze the reasons:
1.Wheel loader machine diesel engine work, speed rise is not high. In movable arm, turning the reversing valve valve are in a neutral position, the engine accelerator pedal stepping on to the end, if diesel engine turning velocity is less than rated speed, may be the diesel engine fault, check the reasons for the low speed diesel engine.
2.Small throttle, bucket wheel loader movable arm ascending slowly (or movable arm up), turning weakness, when the accelerator is working properly.
The front end bucket loader cause of the failure are as follows:
A.Pump work badly worn or damaged, a working pump should be replaced.
B.Pilot operated relief valve opening pressure is too low or seal is lax. Applied pressure gauge measuring the pressure of hydraulic system work, if the pressure is too low, can’t adjust blindly, should first remove the relief valve, check whether the pilot valve spring is fracture, seal are in good condition, the main valve core is jammed, etc. And then according to the situation.
C. Hydraulic oil cylinder piston sealing ring damaged or oil cylinder cylinder wear a drawing mark caused by oil tank leakage. To determine whether a cylinder inside leaking and oil cylinder can be exactly, then loosen the rodless cavity tubing, rod cavity to go on with oil filled, if there are a large number of hydraulic oil from the rodless cavity, then drain in cylinder, should repair oil cylinder.
3.Small throttle work normal, down at the job. Appear this kind of circumstance, how to work of hydraulic system caused by low pressure oil leakage, check the low-pressure oil seal.
The loader machinery cause of the failure are as follows:
A.Hydraulic oil tank oil level is too low, make work pump suction empty, cause lack of oil absorption;
B. Work into the tubing pump seal bad or hose aging, make the air into the tubing, due to the compressibility of air, cause the system pressure is insufficient.
The loader machinery cause of the failure are as follows:
A.Hydraulic oil tank oil level is too low, make work pump suction empty, cause lack of oil absorption;
B. Work into the tubing pump seal bad or hose aging, make the air into the tubing, due to the compressibility of air, cause the system pressure is insufficient.
C. Working pump leakage, lead to work into the air in the hydraulic system.In addition, the hydraulic oil brands do not conform to the requirements, can also cause the shovel loading is weak, and should be replaced according to the requirements of hydraulic oil.
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Post time: Jul-29-2017