The essential thing for driving an excavator is the daily maintenance and fault maintenance. I have learned that many masters of excavators have encountered some common faults and do not know how to solve them. Here, Liteng Machinery has compiled some excavator maintenance Knowledge quiz, hope to solve the problem for the masters:
1. What should be paid attention to when grinding the end face of the gear?
After the gear pump gear is worn, it needs to be ground with a high-precision grinder, and it is necessary to find a responsible master to operate. Because the worktable is slightly unclean, the ground plane will be offset from the vertical line of the bearing hole.
2. What should be paid attention to when assembling the gear pump?
The wear of the pump housing will be a little more in the oil inlet cavity. If the pump housing is symmetrical, it can be turned 180. reuse. For the passive gear, the two ends cannot be exchanged, and a mark should be made when removing. Because the gear will wear on one side. The active tooth is integrated with the rotating shaft and cannot be turned over; turning the passive tooth over can change the contact point of the meshing line of the two gears. After the pump is assembled, you need to add a little lubricating oil before rotating it by hand. The feel should be smooth.
3. Should the bearings on the end face be replaced at the same time during assembly?
Must be replaced at the same time. For excavator repair, select a solid, flat, and low-risk environment for inspection and maintenance; the shovel teeth should touch the ground; stop the engine, and pull the key; the track should apply safety measures such as stop blocks. Because of the wear of the pump end surface, the bearing clearance is too large, which causes the gear to swing during rotation.
4. After inspection, the damping hole is not blocked, why can't the pressure of the safety valve be adjusted?
Most of this situation is due to the tight closing of the poppet valve and the valve seat, so that the oil pressure in the C cavity cannot be established.
5. How to know the perpendicularity of the ground surface of the gear and the bearing hole has changed?
Can only be found when assembling the gear pump, because the clearance of the end face is very small, generally around 0.05mm. If the perpendicularity between the end face and the bearing hole changes, the gear shaft cannot move after the pump is assembled. If the locking screw is loosened a little, but it still does not turn smoothly, then dismantle the gear pump, and there are scratch marks on the end surface. This is due to the fact that the end plane is not perpendicular to the bearing hole.
