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  1. #1
    New Member
    Join Date
    May 2011
    Posts
    2
    Tractor
    Allis Chalmers 620

    Default

    Noobie here. Looking for info to adjust the brakes on an allis chalmers 620 (made by Simplicity) hydro with 3 ranges. Just freed the left right pedals to work independently and see some Braking but mainly stop just on the hydraulics. Parking brake is marginal at best. Needed the brakes badly when it popped out of gear on my hill. I'm hoping there is an external adjustment because the machine is running good and I don't want to get into the axle unit unless something breaks.
    Thanks.
    Last edited by Pilgrim64; 05-06-2011 at 05:59 PM.

  2. #2
    New Member
    Join Date
    Jul 2012
    Posts
    7
    Location
    Queensbury,New York
    Tractor
    Simplicity Conquest 23 hp

    Default Re: Allis Chalmers 620 (Simplicity) Brake Adjustment

    Hi Pilgrim Im a new member just on a few weeks (see my post new mem sim ac fan)
    I need to do the same with my AC616 that is brake adjustment I have the service manual
    and have read up on it guessing since you posted more then a year ago you have adressed
    the brakes if so where you successfull and how bad of a battle was it
    and if you havnt and need to reference my manual let me know
    Ive been dragging my feet (no not literally) just thinking I would be asking for a minor miracle
    with a machine about 40 yrs old
    Anyway if you have any input thanks Gary in NY

  3. #3
    Elite Member jimmyj's Avatar
    Join Date
    Aug 2007
    Posts
    3,783
    Location
    Ontario Canada
    Tractor
    Allis Chalmers 616 (Two) and a Kioti CK30 HST with loader and backhoe

    Default Re: Allis Chalmers 620 (Simplicity) Brake Adjustment

    I know in these old machines the seals usually go. The fellas at a club site called michaelstractors will be able to help you.
    God Bless our brave men, bring them home, safe again.

  4. #4
    New Member
    Join Date
    May 2011
    Posts
    2
    Tractor
    Allis Chalmers 620

    Default

    Michael's tractors has all the manuals on the AC/Simplicity tractors including a manual containing the brake info. It has Onan CCK manuals,too. That site is a great resource.
    I have not adjusted mine because I don't have time to tear into the machine.

  5. #5
    Platinum Member npalen's Avatar
    Join Date
    Nov 2009
    Posts
    662
    Location
    Beloit, KS
    Tractor
    Kubota B9200 HSTD and Allis 720

    Default Re: Allis Chalmers 620 (Simplicity) Brake Adjustment

    Simplicity & Allis-Chalmers garden tractor Club, Inc.
    Lots of good info here on the Allis Compacts. Maybe do a search "brakes Allis 720 620 powermax" or something like that.
    The powermax is the Simplicity version of the Allis 720.
    Edit: One solution I've heard is to lock the brakes then drive a distance to burn the oil off of the linings.

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