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There is a one minute video, but it is a 30 minute videos speeded up! The fill cap takes a large Allen key. It is not the cap under the bottom of the gearbox, it is situated in the top of the drill.
if the motor get hotter then normal this mean that the motor is coming to an end .
normally the armature or the coils of the motor starting to break down . but can be renewed , if the armature is broken that is the expensive part
Most likely the O-rings are worn - tool has no compression to move the hammers inside.
Less likely: the connecting rod for the piston is broken so piston isn't moving - or 2nd hammer is broken into pieces.
I would open it up & check the orings first
The TE 17 is at least 29 years old. It will do up to an inch. However there are no parts available for this tool. Also be carefull if it has a black fill cap on top of the gear housing then it does not have a safety clutch. If it has a red one then it does have a clutch.
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.
Hilti has not carried parts for the TE17 for about 15 years. That tool was produced from the 60's up until the early 80's. The part you are looking for is an Oilite bushing that is held in the motor end cap. Even though the part is no longer available a good machine shop should be able to make you one.
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