How to Deal with The Problem of The Whole Machine Shaking When the Doosan Excavator Rotates and The Bucket Arm Works

How to deal with the problem of the whole machine shaking when the doosanDH220LC-V excavator rotates and the bucket arm works

1. Inspection method:

A. First analyze whether the cause of the jitter is mechanical jitter or hydraulic jitter. The mechanical

cause is mainly the jitter caused by the internal breakage of the rotary reducer or the oil cylinder. After

checking that the parts are normal and have no damage, mechanical jitter can be ruled out. Normally,

the negative control pressure is measured during rotation and stick action. The pressure during wide-

center action is 6 BAR. The neutral pressure is 40 BAR. Normal.

B·Check that the overflow pressure during rotation is 285 BAR and the bucket arm overflow pressure is 332 BAR.

C. According to the analysis, because two actions vibrate at the same time, it can be basically

concluded that the problem lies in the main pump. Damage to the pump’s plunger, sliding shoe, etc.

will

cause the actions associated with the pump to vibrate, and some actions do not feel right. obvious.

2. Reason: After dismantling and inspecting the main pump, a crack in the sliding shoe was found,

which caused excessive leakage of the plunger and caused working jitter.

3·Processing method: Clean the main pump and replace the corresponding accessories OK