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  1. #1
    Join Date
    Apr 2006
    Location
    Germany
    Posts
    526

    Default HILTI - What's the big deal?

    If you’ve ever wondered why HILTI rotary hammers cost a small fortune, you only have to take one apart to understand why. I have rotary hammers from Makita and Hitachi and they can’t hold a candle to this TE 54. Anyone who's ever used one will also tell you that they pack one hell of a whallop for such a light machine. You get the feeling that the bit is being sucked in by the concrete...

    The technology is amazing. Specialised electronics in compartmental components that slot together and a gearbox/hammer lubricated with oil instead of grease. The pneumatic hammer mechanism consists of precision-machined hardened parts and a clever energy delivery/absorption system.
    <O</O
    This machine belongs to an electrician mate of mine who used it almost daily for 8 years. This is its first service:

    Attachment 58940 Attachment 58941

    I pulled it down and cleaned the whole lot up with a petroleum-based cleaning agent. The first thing to catch my eye was the wear on the spline.

    Attachment 58945

    Bugger! It still runs nicely and I could build it back in but the teeth are thin and it won't be long before one gives. It runs a complicated (and expensive) gear wheel that is still good. If it burrs and starts spinning, I could well end up replacing both. I will order a new one.

    Getting to the piston chamber and hammer mechanism requires the removal of a one-way seal. Oil was leaking into the SDS chuck and it would have had to be replaced anyway so I didn't feel too badly about drilling it out...

    Attachment 58942

    The hardest part to break down is the piston chamber and hammer mechanism. I had to build a special clamp to achieve it:

    Attachment 58943

    There were times when I wanted to just clean it and forget it but I knew that the absorber is a wearing part and had to be got at. It was of course, the most difficult to remove. In the end, the clamp worked well and I was able to seperate the SDS rod from the striking chamber. Was worth it because as I expected, the absorber was showing some serious signs of wear. (My mate explained the bit feedback didn't feel right. He also said the hammer action stays active too long when there's no bit feedback.) These are the reasons I wanted to get at the absorber and the striking pin.

    Attachment 58944

    Anyway, I found a bloke looking to unload smaller amounts of the special oil and he's sending me some. You can only buy it litre-wise from HILTI (which he did) and he was in a forum over here offering it. I thought I tracked down the RAL colour to respray the aluminium housing but the thing now looks like a fire engine . I'll get the right colour next time I'm at the hardware shop...

    Will put her back together once the parts are here and take a picture.

    Damien
    Is it wrong to be in love with a sawbench?

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  3. #2
    Join Date
    Jul 2004
    Location
    Adelaide Hills
    Age
    66
    Posts
    3,803

    Default

    Looking at those pics Im reminded of the day I decided to pull apart the wringer on my Mums washing machine. The thing never did run quite the same after Dad somehow managed to put it all back together.
    Whatever note you blow youre never more than a semitone away from the correct one....(Miles Davis)

  4. #3
    Join Date
    Dec 2005
    Location
    Gold Coast
    Age
    66
    Posts
    1,083

    Default

    I have a Hilti dry-wall screwdriver, Damien, and you're right when you say that they have a lot of power for weight. The only trouble with them is that they are sold a bit like Snap-On, where you have to buy them directly from a few specialist outlets. And you can't compare prices because the prices aren't reasily available.

    I like to do some research before I buy tools and this process makes research harder.

    I also think that they're overpriced.

  5. #4
    Join Date
    Dec 2005
    Location
    Japan/ U.K.
    Age
    47
    Posts
    579

    Default

    Good job there mate, I wouldnt dear to take one of those apart
    On the subject of Hilti...I was in a secondhand shop yesterday, and saw a hilti sf 100-a (9.6v) sitting on the shelf for $50. The battery was flat so I couldnt give it a whizz...Hilti batteries any good? anyone used a sf 100-a?
    I was worried the drill might be half dead, so I put it back on the shelf
    cheers!

  6. #5
    Join Date
    May 1999
    Location
    Grovedale, Victoria Australia
    Age
    66
    Posts
    3,896

    Default

    Damien have to agree with you, Hilti tools are built to last and do any job real easy.

    They are only sold a specialised outlets because the people who sell them know what they are capable of and are generally a tool salesperson.

    Here in Aus if you have a hilti tool and it need servicing you send it back to hilti and it comes back almost a new tool as they have all the parts on hand and do a really good job, they dont take of the bumps and scratches the owners has put on the tool.

    Not overpriced when compared to similar tools just overengineered and built to last.
    Jim Carroll
    One Good Turn Deserves Another. CWS, Vicmarc, Robert Sorby, Woodcut, Tormek, Woodfast
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  7. #6
    Join Date
    Oct 2003
    Location
    Sydney,Australia
    Posts
    3,157

    Default

    Be aware that there are fake HILTI drills going around - even a GMC or Ozito drill will outlast them.

    A plumber that had a unit next to my mate was sold 2 of them & when he took them to HILTI for service they told him they were fakes. From the outside you would never know, box, accessories, documentation look good but it seems the serials don't match.

  8. #7
    Join Date
    Apr 2006
    Location
    Germany
    Posts
    526

    Default

    Quote Originally Posted by underused View Post
    Good job there mate, I wouldnt dear to take one of those apart
    On the subject of Hilti...I was in a secondhand shop yesterday, and saw a hilti sf 100-a (9.6v) sitting on the shelf for $50. The battery was flat so I couldnt give it a whizz...Hilti batteries any good? anyone used a sf 100-a?
    I was worried the drill might be half dead, so I put it back on the shelf
    cheers!
    Don't know mate. I did have a Hilti glue gun that was the bee's knees but some rotten bugger stole it. I'm only mentioning it because it's an example of a good tool outside their core-competence which is rotary hammers. I'd expect their battery drills to be pretty good...
    Is it wrong to be in love with a sawbench?

  9. #8
    Join Date
    Apr 2006
    Location
    Germany
    Posts
    526

    Default

    Quote Originally Posted by bsrlee View Post
    Be aware that there are fake HILTI drills going around - even a GMC or Ozito drill will outlast them.

    A plumber that had a unit next to my mate was sold 2 of them & when he took them to HILTI for service they told him they were fakes. From the outside you would never know, box, accessories, documentation look good but it seems the serials don't match.


    I hope he didn't pay too much for 'em...
    Is it wrong to be in love with a sawbench?

  10. #9
    Join Date
    Nov 2004
    Location
    Santpoort-Zuid, Netherlands
    Age
    67
    Posts
    462

    Thumbs up Excellent job!

    Hi Damien, this is a magnificent contribution! I know how much time it takes to arrange components like that to get a decent picture of them. The story is also enlightning and useful, three cheers for members who invest such effort! You're absolutely right, the Hilti brothers from Schaan started in the fifties with quality that was hard to match, but those days are over. When you saw a TE17, you saw the original on which Hitachi modeled its DH25V and Makita its HR2510. The TE22 and TE72 were very good jobs as well, but after that the frugal toy engineers came in, shifted their emphasis to design smugness (to disguise minimal use of expensive materials) and a tightly reigned sole distributor's network. And now they mainly float on the brand name and reputation of yesteryear. Hilti became popular in Holland because our state telephony company PTT issued every engineer's van with tools including a TE72, for drilling foundation holes for cable entries into office buildings. That's over now, contractors may as well buy Bosch or Hitachi or Makita or Kress or B&D/DeWalt now, the difference is not all that great (the same as with family cars really; the production techniques and metallurgy and function lists are virtually the same throughout brands and countries).

    Best regards, Gerhard Schreurs, Netherlands

  11. #10
    Join Date
    May 2006
    Location
    Gosford
    Posts
    770

    Default

    Nice post and WIP, Damien. Somewhat daunting for most I would imagine, but you obviously know what you're doing.

    First service in 8 years probably summarises Hilti quality - top stuff. Unfortunately the few pieces of Hilti gear I owned were "acquired" by others a few years back by breaking into the tool boxes on my ute. I ended up replacing 2 of the drills with Ramset models which seem to be of similar reliability.

    I'd hate to think what your re-build would cost from an authorised service agent. Just the parts would probably be more than some cheap model drills.

    Wayne
    Don't Just Do It.... Do It HardenFast!!

    Regards - Wayne

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