Engineers teach you how to replace the oil seal of the breaker

Step 1:

Remove the outer shell and take it off. Just unscrew the four clamping screws on the top. If there is sand and mud on the screws, apply some waste oil first to make it easier. If it doesn't work, consider using a pneumatic cannon. It's not a problem for a pneumatic cannon.

Step 2: Remove the cylinder body

Remove the four long rod screw caps on the top, and the hammer can be separated. The top one is the nitrogen chamber. The hydraulic oil pushes the piston up to the nitrogen chamber. When a certain pressure is reached, the piston is pushed down to generate energy to hit the drill rod, and the movement repeats. There is a sealing ring at the port, so pay attention to check it.
Remember: Nitrogen must be released before removing the long bolts to prevent injury.

Step 3: Take out the piston

Generally, the piston is taken out from the nitrogen chamber end, and there is a piston retaining ring behind it to seal it, which can be taken out by tapping it with a hammer.

After taking out the piston, you can see the sealing ring of the middle cylinder body. Ordinary hammers are generally composed of two sealing rings plus a cup buffer. The outer one is a dustproof sealing ring, the inner one is anti-seepage oil, and the cup is inside. When replacing the sealing ring, you must polish a good tool yourself. It is best to use steel wire or a long hard tool for polishing. I use an extended small hexagonal tool for polishing. The head must be made into a pointed cone, so that it is easier to remove the sealing ring.

Step 4: Install the oil seal

It is best to clean the inside of the cylinder with gasoline, blow it with air, and take out the Y-shaped ring at the front end, with the Y-shaped inside facing inward and the dust ring Y-shaped facing outward. The rear end is an air ring and two oil rings. The oil ring has an O-ring. Take it out together when replacing. After installing it, press the seal with a cylindrical object to prevent unevenness and damage when installing the piston.

Step 5: Install the piston

When installing the piston, first apply a layer of lubricating oil, then slowly insert it, be careful not to hurt your hands, put the piston in place, and then install the rear piston retaining ring. When installing the retaining ring, it is best to use butter to grease the O-ring to prevent dislocation.

Install the long bolt and insert it into the middle cylinder, and then install the nitrogen chamber. After the screws are installed, do not use a jackhammer to tighten them manually. Tightening with a jackhammer may cause the nitrogen chamber to deform and leak. After tightening the screws diagonally, use a pound wrench to tighten them to achieve the same pressure on each screw. Then install the splint, and the repair is complete!

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