TE-72 sporadic hammer

The TE-72 rotary hammer drill is designed to perform both drilling and hammering functions, so if it's not drilling, there could be a few potential causes:

1. Dull or damaged bit: Check the bit to make sure that it is sharp and not damaged. A dull or damaged bit may not be able to penetrate the material you're trying to drill through. If the bit is dull or damaged, replace it with a new one.
2. Incorrect bit size: Make sure that you are using the correct bit size for the material you are drilling through. Using a bit that is too small or too large can cause the drill to spin without making any progress.
3. Worn chuck or collet: If the chuck or collet that holds the bit in place is worn or damaged, it may not be able to grip the bit properly, which could cause the drill to spin without making any progress. Inspect the chuck or collet and replace it if necessary.
4. Low power or voltage: If the drill is not receiving sufficient power or voltage, it may not be able to drill through the material. Check the power cord and outlet to ensure that they are functioning properly.
5. Malfunctioning clutch: The clutch in the TE-72 rotary hammer drill is designed to disengage the drill from the material in case of a jam or overload. If the clutch is malfunctioning, it could cause the drill to stop drilling. Have a professional technician inspect and repair any faulty components.

If none of these solutions work, it's recommended to take your TE-72 rotary hammer drill to a professional repair service for further diagnosis and repair.

Question edited for clarity.
Question moved from Computers to Hilti.

Here are parts suppliers.

https://www.google.com/search?q=TE+76+Hilti+parts

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TE2, TE4, TE6, TE7, TE30, TE40. The 30 and 40 are only corded, (not cordless).

TE-C bits come TE-C (standard head) and TE-C3X which is a high performance bit. SDS is the industry term for this connection.

It takes 70 cc of oil in the gear casing. Too much oil will snap the connecting rod. If it did not have oil in it there might be a leak somewhere

More than likely the con rod is broken. To check remove the shift lever on top by removing the center phillips head screw. then with internal snap ring pliers remove the snap ring.put your phillips screw back in with out the shift lever. Take a pair of pliers and grab the screw and pull the shift boss out. You then can see if the con rod is broken or not. The bad news is those parts are hard to come by.

Around 50cc's if it is still wet. 70cc if dry inside

Hilti no longer carries parts for the TE72. You would have to find parts on Ebay or somewhere like that. There is a good chance that the con-rod is broken. Taking off the selecter lever on top. Removing the snap ring and then pulling out the shift boss will allow you to view the con-rod.

It could be that your connecting rod is broken. You can check by taking your shift lever off of the top of the gear housing and then removing the snap ring to remove the shift boss. That will allow you to look at the crankshaft and connecting rod. If it is broken I would check with Hilti to see if they still carry parts for the TE 72.

Probably a missing ball problem---contact Hilti website.

Do not put it in hammer mode and try to unscrew the chuck! This will break the housing internally. To remove the chuck you will have to put a chisel in the chuck. Lock that chisel in a big vice. You will then have to put a pipe wrench on the chuck to unscrew it. It is regular threads but there will be loctite on it. Once that is off your will have a spring and two roller bearings to remove before you can slide the bell off. You will then have 8 5MM screws to remove. This will remove the chuck. You will then have a snap ring to remove. After that you can remove the whole cylinder assy. More then likely your connecting rod is broken.