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With hammer drills, there are usually 3 positions for operation.
Position 1 - Drill only - drill rotates
Position 2 - Hammer and Drill - Drill rotates and hammers
Position 3 - Hammer only - hammer action
It is important to read the instructions to activate the part to select position 1, 2 or 3.
Sometimes, it is easy to move from position 1 to position 2. Sometimes it is easy to move from position 2 to position 3.
Sometimes it is difficult to move from position 2 to position 3.
When it is difficult to move from position 2 to position 3, you may need to rotate the chuck a little way before turning it to position 3.
If there is a directional switch that changes the drill between forward and reverse, and that switch is in the middle position, the drill will not move.
The "sleeve" below the chuck slides and twists. If it is in the forward position it's in drill mode, because the chuck can't hammer, pull it back and it will be in hammer mode. (the picture shows the black plastic sleeve in the forward position, which can be pulled back over the metal that is still exposed)
There is a spring loaded detent that keep the switch from moving. It is either dirty or needs replacing. The whole front of the unit needs to be opened to access it.
there should be a slider type switch on top of the drill. and there will be a picture of a hammer, and a picture of a drill. slide accross to the drill picture for drill, and hammer for the hammer drill
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.
I looked at Makitausa.com website and it appears that you might be correct. there are 4 parts to this assembly and one of the problems might be the cam holder position #17. I would suggest that you go to their site and take a look at how the parts are supposed to be. I used the model number in the large header so this might not be the exact one that you have. Let me know and I will try and help further.
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