1. What should we pay attention to when grinding the gear end face?
After the gear of the gear pump is worn, it is necessary to use a high-precision grinder for grinding. It is necessary to find a master with a strong sense of responsibility for operation. Because the workbench 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 pump casing is more worn in the oil inlet chamber. If the pump casing is symmetrical, it can be turned over 180 °. Reuse. As for the driven gear, the two ends cannot be exchanged. Make a mark when removing it. Because one side of the gear is worn. The driving gear is integrated with the rotating shaft and cannot be overturned; Turning the driven gear over can change the contact point of the meshing line of the two gears. After the pump is assembled, a little lubricating oil shall be added before the pump is rotated slightly by hand, and the feel shall be smooth.
3. Should the bearing on the end face be replaced at the same time during assembly?
Be sure to replace it at the same time. For excavator repair, select a solid, flat and less dangerous environment for inspection and maintenance; The shovel teeth should be on the ground; Stop the engine and remove the key; The crawler shall be provided with safety measures of block type. The wear of the pump end face is mainly caused by the large bearing clearance, 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 is because the cone valve and valve seat are not tightly closed, so that the oil pressure in chamber C cannot be established.
5. How to know that the perpendicularity of the ground gear plane and the bearing hole has changed?
It can only be found when assembling the gear pump), because the clearance of the end face is very small, generally about 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 still does not rotate smoothly, disassemble and inspect the gear pump, and the end face is scratched again. This is caused by the fact that the face plane is not perpendicular to the bearing hole.
