If the chuck has stopped rotating, how can it be repaired?

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In the raster bushing, find two holes in which part of the retaining ring is visible.
Using a screwdriver, pry up the retaining ring in both holes.
The striker will fall out of the raster bushing. If it does not fall out, then insert a screwdriver into the opposite hole and push it
As a result, we get a striker, which consists of several parts, including sealing cuffs, which are recommended to be replaced with new ones.

Often the striker bolt fails and needs to be replaced.

After replacing it, it is necessary to assemble the parts and install the mechanism in place inside the raster tube, having previously lubricated each element. The striker is fixed with a locking ring, which is installed by pressing with a screwdriver.

The video shows in detail how to remove and replace canada telegram data skew bearings and impact pins on hammer drills.

In any case, if you change parts, you need to completely replace the lubricant at the same time, cleaning the entire mechanism and the body of the mechanical part from old wear. If you do not do this, then the repair will most likely have to be repeated, since the lubricant contains a lot of metal dust and fragments.

Before repairing a hammer drill, you will first need to identify the cause of the breakdown. For example, if the working element or chuck does not rotate, the gear mechanism may be the cause. The torque from the engine shaft to the intermediate shaft of the tool is not transmitted due to the wear of the teeth on the gears, so the chuck does not rotate.

Another reason why the chuck may not rotate is because the gear unit is jammed. If part of a gear tooth has broken off, it could be jammed inside the rotating elements, which causes jamming. If the gear unit is jammed, it will be audible. The engine will hum, but the tool will not work. Disassembling the tool and removing the jammed parts will help to fix this kind of breakdown.