When it comes to the walking motor of the excavator, I believe that many operators will have lingering palpitations, not only because the walking motor controls the most important action of the excavator - walking, but also because the problem of the walking motor will cause many walking failures. Now let's analyze the working process of the walking motor of the Kobelco excavator.
1 working process of travel motor at low speed
·The travel speed solenoid valve is degaussed, so the pilot pressure oil from the pressure reducing valve does not flow to port D
·Therefore, the regulating valve (6) is pushed fully to the left by the spring (7)
·Therefore, it pushes the check valve (32) so that the main pressure oil from the control valve to the end cover (5) is cut off by the regulating valve (6)
·At the same time, the pressure oil at the cavity a of the adjusting plunger (23) is discharged to the motor housing through channel B of the adjusting valve (6)
·As a result, the swashplate (11) is pushed to the maximum swashplate angle direction by the main pressure in the cylinder chamber P, the motor capacity becomes the maximum, and the system is set to low speed.
2. working process of travel motor at high speed
·When the travel speed solenoid valve is energized, pilot pressure oil from the pressure reducing valve flows to port d to push the regulating valve (6) to the right
·Therefore, the main pressure oil from the control valve enters the adjusting plunger (23) at the bottom through passage B of the adjusting valve (6) and pushes the adjusting plunger (23) to the left
·As a result, the swashplate (11) is pushed to the minimum swashplate angle direction, the motor capacity becomes minimum, and the system is set to high speed
Analysis on oil pipe explosion of walking motor of Kobelco excavator:
1. The oil pressure is too high or the oil pipe is of poor quality
2. It may be caused by the instantaneous increase of pressure. You can check whether the lower oil return pipeline is unobstructed and try walking in the opposite direction
3 the replaced oil pipe is of poor quality
4 is the overflow valve adjusted in the proper position? It is recommended to eliminate the problem from the part below the center revolving body
5 after the speed change, the two speed valve element did not return in time, causing the instantaneous pressure to be too high, resulting in the oil pipe explosion of the excavator travel motor
What should I do if the oil pipe of excavator travel motor bursts?
1 if it is caused by too high instantaneous oil pressure, first increase the spring force of the double speed valve, then grind the double speed valve to remove burrs, and finally operate correctly in the daily operation of the excavator
2 adjust the overflow valve on the travel motor
3. The pressure of the travel pump safety valve is too high or stuck, the pump liner is leaking, and the pressure of the oil leakage return pipe is too high or blocked
4 the traveling pump leaks too much oil. The oil leakage return pipe is a small pipe with a big finger. If too much oil is leaked, the small return pipe and the pump bladder cavity will form excessive pressure
What is the general cause of oil leakage of excavator travel motor?
1. If the excavator traveling motor leaks oil, first observe what kind of oil is leaking
2 generally, the traveling motor we commonly call is actually the traveling motor and reducer assembly. The motor and reducer are two parts There is hydraulic oil in the motor and gear oil in the reducer
3 the motor leaks hydraulic oil because the seal is not tight. The reason is that the rubber O-ring is aging, the pipe joint is loose and the pipe is damaged
Gear oil leaks from the reducer. Generally, the floating oil seal is worn or foreign matters are stuck
5 the reducer leaks hydraulic oil, the motor frame oil seal is damaged, the hydraulic oil pressure is high, and it runs into the reducer
6. Generally, the oil distribution plate is worn and leaks oil, and then some of the framework oil seals bulge
7 the sealing ring is worn
