The slewing motor is the key component of the slewing mechanism of the excavator. It converts the oil pressure provided by the main pump into mechanical energy and inputs it to the reducer. Its working performance will directly affect the rotation speed of the whole machine. Driving torque, rotation parking and parking braking are the key to determine the productivity of the whole machine.
After working for a long time, the rotary motor of excavator often has the phenomena of weak rotation and unstable rotation. At this time, it is necessary to replace the internal parts according to the test results. Many people don't know how to disassemble the rotary motor. The following article will take the swing motor of a brand of excavator as an example to explain how to disassemble the swing motor for reference only. The tools needed are 5-17mm hex wrench, 24mm box wrench, 2 slotted medium-sized screwdrivers, 1 medium-sized adjustable wrench, shock absorber hammer, torque wrench, circlip pliers and brake piston drawing tool.
1. Choose a relatively clean and large operation site, and it is best to pave a rubber plate or a thick cloth on the operation platform to prevent bumping marks on the parts when touching the parts.
2. Use cleaning oil to remove garbage, oil stains, rust, etc. on the surface.
3. Lay sleepers on the worktable in advance, and place the shaft end of the transmission shaft downward and vertically on the sleepers. Mark the joint between the shell and the valve body.
4. Loosen the overflow valve with a wrench and take it out of the valve body.
5. Loosen the anti reverse valve with a 24mm ring wrench and take it out of the valve body.
6. Use a 6mm hex wrench to remove the anti reverse valve body.
7. Use a 14mm hex wrench to remove the plug from the valve body and remove the spring and check valve. At this time, it must be noted that when removing internal components, it is necessary to operate with bare hands.
8. Use a 14mm hexagon wrench to loosen the hexagon bolt of the valve housing. At this time, due to the elastic force of the brake spring, loosen the hexagon bolt diagonally and gradually. After the bolt is loosened, the valve will float from the housing automatically.
9. Take out the valve plate and brake spring from the valve body.
10. Use the brake piston pulling tool to pull the brake piston vertically upward from the housing. At this time, pay attention to hook the claw tip of the special tool to the concave part of the brake piston.
11. Place the rotary motor horizontally on the worktable, take out the friction plate and spacer from the housing, and take out the cylinder block, piston and swashplate from the transmission shaft in turn. Because the plunger and the cylinder block correspond one by one, it can be marked when taking out to match with the cylinder block during installation. At this time, pay attention not to bump and scratch.
12. Take out the fixed circlip of the transmission shaft with circlip pliers, and gently tap the transmission shaft with a shock hammer to pull it out of the housing.
