An example of trouble shooting of rotary motor
Fault phenomenon: a W4-60C type excavator boom in rotary machinery, violent vibration and accompanied by "thump, thump" sound, and turn slow and weak, not simply brake.
Fault analysis: the arm rotation touch rotary motor has obvious vibration sense, the bucket rod extended, rotary reversing valve rod is in neutral position, the engine flameout, then on the ground with a force of people can easily push the swivel arm. In view of the above phenomenon by analyzing possible faults in the rotary motor and the safety valve, the further decomposition of the rotary motor when motor is found for axial positioning ring positioning of slipper loosing and Jiaocheng iron shape, the oblique disk has many pits, grooves oil pan. In the decomposition of motor safety valve, it is found that the safety valve spool and valve seat due to wear and tear has been sealed.
Troubleshooting: rotary motor clean, the inclined disk pit turning off, and grinding grinding smooth, with grooved grinding pan appear flat, re processing a ring, and then the motor loading complex; the other will motor safety valve spool and the valve seat grinding after loading complex. When the machine test, the fault disappeared.
Fault: the mechanical rotary motor with double swashplate axial piston motor, piston cylinder and the drive shaft of the motor as a whole, the plunger and slipper slipper is plane sliding, due to the positioning of axial positioning of slipper ring loose, positioning ring in the rotation of the motor is cut into chips and shape. The slipper along the inclined plate surface sliding friction force due to iron will impact the swash plate into many pits, in turn whenever the slipper after these pit machinery will appear severe vibration, and issued a "click, click" noise. Due to the groove with oil sealing surface scratch is deep, then the motor into the oil spill, therefore, motor oil inlet pressure decreased so that the inability of rotary. When the high pressure oil higher than 9.8MP flows through the safety motor valve, the high pressure oil pushes away the valve core, and the oil is discharged back to the oil path so that the pressure is kept at 9.8MP. When the rotary platform stop rotation, only the control lever is in neutral position, the hydraulic motor inside the original oil cavity and the oil inlet cavity were closed, due to inertia, the original oil cavity pressure increases, resulting in brake, when the pressure is up to 9.8MP when the safety valve discharge oil and hydraulic flow the motor into the oil chamber, but also the role of oil supply valve. In this case, because the motor safety valve spool and valve seat due to wear and tear and tight seal, the motor oil drain cavity always pressure relief, so that the rotation brake is not simply.
