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by disassemble the chuck parts to get the ball out and all blocking parts , when the drive guiding the bilt lock is worn it will be happens again in a short time or you have used a wrong chisel ? the where safety glasses after the dissassembling and place the chisel with tool complete on it in a big bench vice and make the dissassembled bitholder hot carefully with a burner and beat the machine from the chisel only if all blocking parts are disassembled or totally removed replace the
chuck parts but also the entire shaft guide if it is simply worn out by wrong chisel not.
SDS Plus is a common connection end. Several companies make them. I have not heard of a carbide tipped pointed chisel. only a carbide tipped chisel blade and bushing tool. Hilti makes very good chisels that will fit the Bosch. Hilti's number is 1800-879-8000
Have seen this problem with some 'none' HILTI bits which do not fit correctly into the SDS chuck.
Tends to be with larger drill bits which have a wider shank than the SDS connector, the wider shank hits the end of the drill nose which stops the end of the drill bit contacting with the internal hammer.
Solution is to purchase original bits from Hilti. If you have OEM bits and chisel it will be another problem. Hope this helps.
I have just dismantled my own TE 905 to see why it was dropping the chisels and have found the following:-
1. The chisel is worn and has almost become too small for the chuck. (mesure the thickness of the chisel at both ends of the hexagonal shaft and see the difference)
2. The chuck is worn and will probably need to be replaced. I phoned Hilti today and was quoted £100 for ONE PART OF THE CHUCK!!!
a. The chuck as a whole can easily be removed by undoing the four torx screws that hold the chuck on to the main body.
b. The chuck can be dismantled by removing the retaining ring that holds the metal outer case in place at the front of the chuck. This is very fiddly and requires some engineering skill, the use of pointed instruments could easily result in injury.
The third fix is the one I am going to use to 'patch up' my old breaker. This involves welding some small amounts of dissimilar weld onto the points of the hexagonal section at the rear of the chisel then grinding them to near enough the original size of the un-damaged section of the chisel. This will very crudely stop the chisel from passing the ball bearings inside the chuck. PLEASE NOTE THAT ANY HEAT APPLIED TO THE CHISEL WILL CAUSE STRESS AND POSSIBLE FAILURE OF THE CHISEL. ANY MODIFICATIONS OF THIS NATURE COULD RESULT IN INJURY TO PERSONS WORKING AROUND YOU AND ARE NOT RECOMMENDED IF YOU ARE WORKING AT HEIGHT OR WITH PEOPLE BELOW YOU. This is a fix that should only be attempted by competent engineers for use on a DIY or small job basis. Hope this helps.
Hilti no longer services the old TE60. If yours is a metal housing here is how you disassenble the front end.First you need to put a flat bladed chisel in the chuck. Then lock the chisel in a vise. Next you put a pipe wrench on the chuck cap nut. That is the piece on the end of the chuck. Using a cheater bar turn the nut off counter clock wise. You then can remove your chisel, the cap nut, an oring and the locking sleeve with two rollers. This will expose the chuck that is held in place with 8 5mm allen screws. After that you have a large snap ring to remove before pulling out the rest of the front end assy.
Are you talking about the cap nut that threads onto the chuck? It is very rare that it would strip out. Word of warning if you do find one and thread it back on. You need to have a chisel in the chuck and have the chisel end locked in a vise. This protects from breaking the gear housing on the inside where the shift dog rides up and down.
Those parts are no longer available but you can still find some used on Ebay. Also the TE-72 used the same chuck parts.