Gehl ct now available with presurized cabs

Discussion in 'Heavy Equipment & Pavement' started by turboawd, Nov 11, 2007.

  1. turboawd

    turboawd LawnSite Member
    from midwest
    Messages: 236

  2. Tigerotor77W

    Tigerotor77W LawnSite Bronze Member
    from Germany
    Messages: 1,892

    Yup. Mustang is the same.
  3. AWJ Services

    AWJ Services LawnSite Platinum Member
    from Ga
    Messages: 4,281

    The sealing of the cab is a given but how do they actually pressurize it so that dust does not migrate in the cab?
  4. cddva

    cddva LawnSite Member
    Messages: 189

    I would presume the air duct fan(s) supplying the cab create a slightly higher pressure than atmospheric pressure.....thus "pressurizing" the cab and causing any leakage to go from the inside out.
  5. AWJ Services

    AWJ Services LawnSite Platinum Member
    from Ga
    Messages: 4,281

    That would make sense but how is the question.
  6. bobcat_ron

    bobcat_ron LawnSite Fanatic
    Messages: 10,137

    But the pressure that builds up has to escape, all airplanes have a large hole to let the excess pressure go somewhere, MythBusters did a gun and airplane stunt once that busted the myth.
  7. cddva

    cddva LawnSite Member
    Messages: 189

    Fan blade design and pitch can be set to develop a positive pressure on the discharge of the fan. I would bet we're talking a very slight positive pressure and the pressure doesn't continue to build (add to itself) due to limitations and inherent losses of the fan as well as probable cab leakage. It would
    only require a slightly positive cab pressure to keep the dust out.
  8. SiteSolutions

    SiteSolutions LawnSite Bronze Member
    Messages: 1,114

    Ummm, for any pump to work, be it an air pump, oil pump, water pump, or just a fan, there has to be a pressure differential across it. That what makes the fluid (air) move.

    After visiting the web site, it kinda looks like a lot of hype and trying to jump on the CAT bandwagon... using CAT's buzz to sell Gehl's barely rebranded Takeuchi loaders. If you read between the lines, it sounds like they put a little extra weatherstripping on the door and rigged it so you can pull in outside air only through the fan, thus "pressurizing" the cab. Only if the filter isn't super good, you'll be sucking in dust too. And what happens when it is 105 degrees out? Pull in outside air only and try to cool it down to a pleasant temp? You can recirculate the inside air to get colder temps, just like "Max A/C" on your car. But then you're not "pressurized" anymore. Maybe I'm just a cynic but it sounds like these guys are just trying to get a few sales on CAT's coat tails with something "engineered" in somebody's driveway with some duct tape and rubber gasket material.
  9. Construct'O

    Construct'O LawnSite Bronze Member
    from Sw Iowa
    Messages: 1,387

    I agree the word pressized is just that(more or less a word! Cat has used that word on there dozer cabs way back when.Mainly like you described it.It is a combination of the fan sucking in fresh air from outside,and the tightness of the sealed cab.

    It has more to do with the tightness of the cab then anything! how well it is sealed from the dust getting in.

    The c series cab is super from what i saw.Very well sealed and no gaps between cab and frame and other places.The cab looked to be build as a complete unit(unibody) from the rest of the machine.Making it completely sealed.

    Thats my take!!!!!! and i have and have had Cat dozer with pressized cab.Believe me it is more to do with the the tightness and how they are built,sealed, then the fan system.Good luck:usflag:
  10. AWJ Services

    AWJ Services LawnSite Platinum Member
    from Ga
    Messages: 4,281

    The Takeuchi cab leaks between the upper cab and the body.
    The Takeuchi door leaks very little.
    It also pulls air from the outside for the AC.

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