This TE 92 has worked fine for years. When drill is cold(30F or less) it would take a minute of operating before hammer was active. Lately it only hammers when drill is started or stopped. I thought that the floating piston was sticking in the advanced position or TDC(top dead centre). I dismantled drill,cleaned and lubed with a light machine oil. It still operates the same. At initial start the drill hammers fine then quits.
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Re: Hilti TE 92 hammer problem
Hi and welcome to FixYa,
Offhand, possibilities are:
partial leak on the compression are of the drive piston;
loose striker piston assembly;
worn/enlarge inner diameter of the pressure ring.
A way to check is to wipe clean from the o-ring, striker piston, retainer ring to the pressure ring. Apply/coat liberally with colored oil (blue like those used as 2T oil for 2 stroke engines) the crown of the drive piston, assemble and test run. Dis-assemble again and note until which component the oil has been forced to. Anything in between then has a leak since it allowed the oil to transfer from the piston crown to that point.
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Active Torque Control (only TE 76-ATC / TE 76P-ATC) The TE76-ATC / TE 76P-ATC is equipped with the Active Torque Control system in addition to the mechanical torque limiting clutch. This system offers additional protection while drilling by rapid shutdown upon uncontrolled rotation in the axis of the drill bit, e. g. when the drill bit jams due to hitting rebar or when the insert tool is tilted unintentionally. When the ATC system has become activated, the tool can be restarted by releasing the control switch and reengaging it after the the motor has stopped rotating ("click"-sound signals readiness for use). Always choose a working position in which the electric tool is free to rotate in a counter-clockwise direction (as seen by the operator). If this is not possible, the ATC system cannot react.
hi i have a 30 year old hilti te17, yes i know but its great but i need the bit holder ( chuck i think its called, the thing that hold the drill bit in for this hammer drill, otherwise its works perfect, built to lasst these things, but parts are hard to come by in aystralia, anyone help me if you can please lulu