How to Repair a Broken Garage Door Shaft

The disassembly of garage door shaft is for regular maintenance, and it is carried out when the bearing is replaced. After disassembly, if you continue to use it, or you need to check the state of the bearing, the disassembly should be carried out as carefully as the installation. Be careful not to damage the various parts of the bearing, especially the disassembly of the interference fit bearing, which is difficult to operate.

The following is a detailed introduction:

1. percussion method

The knocking force is generally applied to the inner ring of the bearing, and the knocking force should not be applied to the rolling body and cage of the bearing. This method is simple and easy, but it is easy to damage the bearing. When the bearing is located at the end of the shaft, use a smaller diameter than the bearing. A copper rod or other soft metal material is pressed against the shaft end, a spacer is added to the lower part of the bearing, and lightly tapped with a hammer to remove it. When applying this method, it should be noted that the position of the cushion block should be appropriate, and the focus point should be correct.

2. Pull out method

Using a special puller, when disassembling, as long as the handle is rotated, the bearing will be slowly pulled out. When disassembling the outer ring of the bearing, the corners of the two legs of the puller should open outward; when disassembling the inner ring of the bearing, the two feet of the puller should be inward and clamped on the end face of the inner ring of the bearing.

Precautions:

1. The hook of the pulling tool should be hooked to the inner ring of the bearing, not the outer ring, so as to avoid excessive loosening or damage of the bearing;

2. When using the pulling tool, the screw rod should be aligned with the center hole of the shaft and should not be skewed. Pay attention to the force of the hook and bearing, and do not damage the hook and bearing;

3. Be careful to prevent the hook from slipping off;

4. The bending angle of the two feet of the puller is less than 90°.

3. Push method

Press the bearing with a press, the work is stable and reliable, and the machine and the bearing are not damaged. The press has manual push, mechanical or hydraulic press push.

Matters needing attention: The force point of the press should be on the center of the shaft and should not be biased.

Four, hot dismantling method

Used to remove tightly fitted bearings. First, pour the oil heated to about 100 ℃ on the bearing to be disassembled with an oil can. After the bearing ring is heated and expanded, the bearing can be pulled out with a puller.

Precautions:

1. First, the puller should be installed on the bearing to be disassembled, and a certain pulling force should be applied;

2. Before heating, wrap the shaft with asbestos rope or thin iron plate to prevent the shaft from expanding due to heat, otherwise it will be difficult to disassemble. When removing the bearing from the bearing housing hole, only the bearing housing housing hole can be heated, not heated. bearing;

3. When pouring oil, the oil pot should be poured smoothly on the bearing ring or rolling element, and an oil basin should be placed under it to collect the hot oil that flows down to avoid waste and burns;

4. The operator should wear asbestos gloves to prevent burns.

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