Question about Hilti Hammer Drill Bit, Te Yx 5/8 In. X 13 In

2 Answers

Hilti TE 92 hammer problem

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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  • Master
  • 6,966 Answers

Hi and welcome to FixYa,

Offhand, possibilities are:

  • partial leak on the compression are of the drive piston;
  • loose striker piston assembly;
  • worn o-ring;
  • 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.

Good luck and thank you for using FixYa.


Posted on Feb 19, 2009

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  • Master
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Have you check the hammer switch could be faulty.

Posted on Feb 19, 2009

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