I had an air powered chassis jack slip off the wnd of the chassis on a tandem axle Mack tractor. The back end of the tractor fell about 12" and the jack jumped about 12' in the air. The jack looked like this one, it's about 5' high when fully lowered.

I have a story similar to MitchN's about a spring brake. The parking brakes on tractors and trailers is actuated by a tapered spring that is about the size of a chevy front spring when uncompressed. In it's compressed state it is 5". There is a dual chamber, the service brake is applied by air pressure, the parking brake is released by air presssure. to replace the brake diaphragm you had to insert a caging bolt in the parking brake and compress the spring, I saw one come apart, it flew about 150'. fortunately there were no injuries.

posted by 66.159.1...

• Safety reminder for those who work under their car..., bRAD, Mon, 31 Mar 2003 10:14:18
  • I used to work on trucks., Dave Westlake, Tue, 1 Apr 2003 08:50:05 <-- Viewing This Message
  • Also be careful with spring compressors!, MitchN, Tue, 1 Apr 2003 00:39:57
  • We all know better than to trust a hydraulic jack, not, Allan, Mon, 31 Mar 2003 22:08:29
  • what about those rhino ramp things, Trev, Mon, 31 Mar 2003 21:33:10
    • Re: what about those rhino ramp things, Dave Westlake, Tue, 1 Apr 2003 08:54:33
  • We lost one of my second cousins that way., RS , Mon, 31 Mar 2003 20:54:47
  • My driveway has no flat area..., Noel, Mon, 31 Mar 2003 18:55:05
  • couple years ago a kid was killed that way..., JimBlake , Mon, 31 Mar 2003 17:37:07
  • Full size van fell on a friends head 6 weeks ago. . ., Allan, Mon, 31 Mar 2003 14:01:37
    • Scary story..., bRAD, Mon, 31 Mar 2003 15:44:24
    • Unbelieveable...Glad to head he's OK...n/m, Wally Kniaz, Mon, 31 Mar 2003 14:32:56
  • JACKSTANDS, WHEEL BLOCKS, JACKSTANDS, WHEEL..., VictorVector, Mon, 31 Mar 2003 10:36:45
    • Yep, safety glasses too..., bRAD, Mon, 31 Mar 2003 13:13:46
  • Was it on a hill, was the emergency brake on?, Jeff Cunningham, Mon, 31 Mar 2003 10:21:48
    • Matter of time..., fsik, Mon, 31 Mar 2003 11:38:16
    • DON'T TRUST HYDRAULICS!!!!!!, Dave Westlake, Mon, 31 Mar 2003 11:10:09
    • Jeff, it only needs to happen once!, John Davies, Mon, 31 Mar 2003 11:04:43
      • Exactly..., bRAD, Mon, 31 Mar 2003 13:10:12

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