Dewalt 18v DCH273 sds drill running but not hammering. Broken Crankshaft. How to repair.

Another Dewalt DCH273 brushless sds drill in for repair. Get a lot of these in for repair, but we also sell quite a lot.
They are extremely popular cordless sds drills, and anyone on the dewalt platform probably has one.

They are a solid drill and very comfortable to use. They do see a lot of work, and they have a good hammer action.
But they are not without their faults.
They are basically the same design are the old nicad 24v sds drill. same layout and gearbox.
when dewalt tool out the brushes 18v lithium sds drill, they simply took the 24v gearbox and fitted and new motor and body.
This was fine, as the power and speed were roughly the same.
But when  they took out the brushless motor, they again  used the same components in the gearbox. The brushless motor is simply too powerful on some of the components, and they eventually fatigue and fail.
Dewalt took a lazy approach and checked the tolerances of the components with the extra power from a brushless motor.

The parts that fail are, the cam shaft shearing, the con rod snapping, the hammer pipe ring spring clip failing, and the piston drying out.

But it is worth noting that they normally do quite a lot of work before these parts fail.
And as a while, they are a good drill, as they are easily ams cheaply repaired again.

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