Created on:2021-05-14 09:34

Common faults of hydraulic motor and general methods of diagnosis and elimination

Common faults of hydraulic motor and general methods of diagnosis and elimination

 

Fault phenomenon

Cause analysis

Exclusion method

A. Low speed and low torque

1. Insufficient oil supply of hydraulic pump

(1) Insufficient prime mover speed

(2) The filter screen of oil suction filter is blocked

(3) It is difficult to absorb oil due to insufficient oil in the oil tank or too small suction pipe diameter

(4) The seal is not tight, there is leakage, and the air invades the interior

(5) The viscosity of the oil is too high

(6) The axial and radial clearance of hydraulic pump is too large, and the internal leakage increases

(7) Variable mechanism failure

(1) Find out the reason and adjust it

(2) Clean or replace the filter element

(3) Add enough oil and increase the pipe diameter properly to make the oil absorption unobstructed

(4) Tighten the joints to prevent leakage or air intrusion

(5) Choose oil with low viscosity

(6) Proper repair of hydraulic pump

(7) Maintenance or replacement

2. The output oil pressure of hydraulic pump is insufficient

(1) The efficiency of hydraulic pump is too low

(2) The adjustment pressure of relief valve is too low or there is a fault

(3) Excessive tubing resistance (too long or too thin pipe)

(4) The viscosity of the oil is small and the internal leakage is large

(1) Check and eliminate the malfunction of hydraulic pump

(2) Check the fault of relief valve and increase the pressure again after troubleshooting

(3) Replace the pipe with larger diameter or reduce the length as much as possible

(4) Check the sealing condition of the internal leakage part and replace the oil or seal

3. Hydraulic motor leakage

(1) The joint surface of hydraulic motor is not tightened or the seal is not good, resulting in leakage

(2) The internal parts of hydraulic motor are worn and leaking seriously

(1) Screw the joint surface to check the sealing condition or replace the sealing ring

(2) Check the damaged parts and repair or replace the parts

4. The hydraulic motor is damaged

The supporting spring of valve plate is fatigued and out of action

Check and replace the support spring

B. The speed is too high

Excessive oil supply

(1) Hydraulic pump prime mover speed too high

(2) The flow setting value of variable displacement pump is too large

(3) The flow area of the flow valve is too large

(4) Beyond the role of load

(1) Replacement or adjustment

(2)重新调整

(3)重新调整

(4)平衡或布置其他约束

C. 泄露大

1. 内部泄露

(1)配流盘磨损严重

(2)轴向间隙过大

(3)配流盘与缸体端面磨损,轴向间隙过大

(4)弹簧疲劳

(5)柱塞与缸体磨损严重

(1)检查配流盘接触面并修复

(2)检查并将轴向间隙调至规定范围

(3)修磨缸体及配流盘端面

(4)更换弹簧

(5)研磨缸体孔,重配柱塞

2. 外部泄露

(1)轴端密封损坏,磨损

(2)盖板处的密封圈损坏

(3)结合面有污物或螺栓未拧紧

(4)管接头密封不严

(1)更换密封圈并查明磨损原因

(2)更换密封圈

(3)检查、清除污物并拧紧螺栓

(4)拧紧管接头

D. 噪声大

(1)密封不严,有空气侵入内部

(2)液压油被污染,有气泡混入

(3)油温过高或过低

(4)联轴器不同心

(5)液压油黏度过大

(6)液压马达的径向尺寸严重磨损

(7)叶片已磨损

(8)叶片与定子接触不良,有冲撞现象

(9)定子磨损

(1)检查有关部位的密封,紧固各连接处

(2)更换清洁的液压油

(3)检查温控组件工作状况

(4)校正同心

(5)更换黏度较小的油液

(6)修磨缸孑L,重配柱塞

(7)尽可能修复或更换

(8)进行修整

(9)进行修复或更换。如因弹簧过硬造成磨损加剧,则应更换刚度较小的弹簧

 

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