Why Wheel Excavators Cannot Walk Normally
Example analysis: A used wheel excavator cannot walk after returning from work on the steel slag loading and unloading site. The inspection results are as follows:
View outstanding tire transitions, transmission shaft transmission is normal; dismantle the pilot oil pipelines that control the excavator’s high and low gears to walk, change the high and low gears, investigate the strong and powerful oil out of the tubing, and be able to remove the check valve and the hydraulic oil circuit; Turn off the engine, the equipment is in the parking brake condition, open the gear box survey cover, view the gear shift fork, you can feel the crack in the middle of the shift fork, and disengage with the slide sleeve, the initial judgment is the shift fork cracking fault.
Why Wheel Excavators Cannot Walk Normally
1. Cause of disease
According to the fracture condition of the shift fork, the reason for analyzing the fault is: during the process of internal travel, the machine has not completely stopped, ie, the high and low gears are switched. The used excavator’s gearbox has no device synchronizer, the net machine trespasses, its internal transmission gear runs at a high speed. If the gear is shifted at this moment, the sliding gear sleeve of the shifting fork cannot complete the meshing with the gear, and the reaction force of the bump directly incurs. Fork damage. Replace the fork with this resolution.
2. Disassemble the gearbox
The dismantling process is divided into several steps: First, loosen the hydraulic fuel tank cap and exhaust the hydraulic system, disconnect the hydraulic pipe that connects with the transmission case, and close the oil leakage point; second, remove the front and rear drive shafts and remove the manual system. Hydraulic cylinder and front axle drive hydraulic cylinder tubing; again, place the adjustable lifter on the lower part of the gearbox to disassemble the orientation, adjust the lifter to support the box, remove the fixing bolts of the three gearboxes, and disassemble the gearbox. From the frame. Because of the large mass of the gearbox, it is necessary to confess that the lifter completely accommodates the holding box and then removes the fixing bolts.
The step of differentiation of the gearbox: First and foremost, disassemble the gearbox cover, and then disassemble the cylinder head locking nut, piston, O-ring, centering disk, tightening spring, spring seat, pin, retaining ring, shaft and dial. Fork and joystick. Second, replace the damaged joystick, shift fork, and aging O-rings. Finally, the wear status of the transmission shaft and the gear inside the transmission box was detected, and the status of each component was recognized as outstanding.
3. Assemble the test machine
The dismantled parts are assembled one by one, and assembly is the reverse process of dismantling. After assembly, install the recovered gearbox to the frame and turn on the appropriate hydraulic lines. Finally, tighten the hydraulic fuel tank cap and start the engine. Raise the dozer blade and hang the high, low, and reverse gear testers.
Reminder: During the process of testing used wheel excavators, special attention should be paid. Do not rush to increase the throttle after operating the gears. Tap the accelerator pedal lightly to feel the movement of the machine. When the internal gears of the transmission box are completely meshed, increase the throttle. To prevent the gear meshing position from shifting back.
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