Question about Drills
You have a bearing problem if it is wobbling and possibly armature damage. You can go to ereplacementparts.com and look at a parts breakdown for disassembly. You can remove the cover to see if the bearing has collapsed. Let me know.
Posted on Mar 01, 2012
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Posted on Jan 02, 2017
SOURCE: Bosch 11247 Hammer drill works
Usually replacing the o-rings on the piston, striker and Impact bolt will solve any hammering issues. That is considering there is no damage to the mechanical parts in the hammer mechanism.
Posted on Apr 13, 2009
They are filled with a special grease that comes from Bosch. It sounds like the impact bolt or the striker pin in the unit are not moving the way they should. These are the pieces that work together to create the hitting action. About all that can be done now is the unit has to be dismantled to get those to pieces moving again. Bosch makes what they call service packs for all thier hammers. They have all the o-rings and grease to get your hammer working again. A Bosch service center can supply you with the kit. Ask for P/N 1617000225, or they can take care of it for you.
Hope this helps
Posted on Apr 16, 2009
If tool hammers brushes still good. Motor runs hammer action.
Take hammer/ drill switch lever off by removing small plastic plug in center with small screw driver.remove indicator handle off by removing #8 torx screw and lightly pry off. There is a pin and spring that lock tool into hammer or drill.Check for broken spring or binding spring and pin.If binding , clean and grease.
Posted on Jul 08, 2009
There is a clutch in the main spur wheel of the unit. These sometime begin to slip, on rare occasions they will slip to the point where the drill will not rotate. If you are interested the part number for this clutch is 1617000817.
Posted on Aug 06, 2009
Exchanged Makita HP1640 hammer drill for a new one. The 2nd drill did the same thing in under an hour!! Will return for refund. Instructions say the Forward/Reverse switch must be in a full up or down position for the Hammer/Rotary switch to move; well, it is and the Hammer/Rotary switch still stops at a 1/2 way point between modes. Although I can still use the drill, instruction warnings say not to because it may potentially burn out the motor. I'll have to go with a different brand this 3rd time around. It seems to be a design flaw.
Posted on Oct 11, 2009
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