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if the brushes don't slide in and out freely without the spring attached then you might have to sand them a tiny bit. this happened with a bunch of my makita brushed tools.
The gears inside that engage the chisel points to move back and forth are either not alligned properly or are stripped. You'll have to open up the hammer to see what, exactly, is the problem.
Hilti has sensors in their tools to detect when things are wrong with them that will shut the tool down under certain conditions. The most common is when the brushes wear down to a point where the tool is shut down so you don't do damage to the expensive armature. Hilti is very stingy with the information on how to reset the system even if you install new brushes, they want you to send the tool to them for repairs or reconditioning. They do a great job, very quickly and you'll essentially have a new tool but it can be expensive so if you want to go this route call to see what the service will cost or if they'll tell you what's wrong, sell you the parts needed and tell you how to reset the sensors.
You can test most of the TE72 electrical with a continuity tester. first make sure the drill is unplugged. Put the clip on one of the plug prongs. then touch the cord on both contacts where the screw holds the cord on. To get to the switch you have to remove the 3 five mm screws holding the handle on. two you can see the other one it at the top and can be accessed by the hole at the top of the handle. Pull the handle loose and remove the two phillip head screws. touch both cord leads where the attach to the switch. If one side lights up then pull the switch and check the contact where the stator wires attach to the switch. repeat with the clip on the other prong. If you have continuity through the switch then it is the brushes, rotor or stator. That involves removing the three 3mm screws holding the endcap on. carefully tapping the endcap off at the brush holder caps with a hammer. then taking to small screwdrives and gently popping up the fan after you have removed the washer and oring above it. Putting the clip on the stator wire at the switch and then checking power at one brush and then at the other brush. Hope that helps
To get to the brushes all you need to do is remove the 3 screws on the back handle of the tool. No need to seperate the motor from the gear housing. Pull the back cover off and you have access to the brushes
Hilti should be able to provide you with them. If not contact a local motor repair outlet and find brushes the same size, they are very easy to change on the TE series.
Failing that Hilti offers a trade-in program for their tools.
If you are talking about the wire going from the switch to the stator it difficult to get to. You have to remove the motor end cap, cooling fan and handle holding the switch. this will get you to the brush holders. These can be brittle so you need to be carefull. Turn the motor over and tap the end of the armature on concrete checking the brush holders every couple of taps to see if they are coming out of the motor housing. after they clear they will just come out. If you havn't done so already remove the wires going to the brush holders. Your stator will simply slide out after your brush holder comes out. This will give you access to the wires to repair.
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