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  1. #1
    Bronze Member
    Join Date
    May 2009
    Posts
    86
    Location
    Whitehorse, Yukon Territory, Canada
    Tractor
    Bobcat CT335 with cab

    Default FWD disengage issue

    I have a CT335 with HST drive and have noticed a few times when I disengage the the front wheel drive that it doesn't always fully disengage until I move forward a distance. Then it in disengages with a noticeable clunk. Has anyone else experienced this issue and if so what was involved in fixing it.

  2. #2
    Elite Member
    Join Date
    May 2012
    Posts
    2,872
    Location
    Knoxville, TN
    Tractor
    Bobcat CT225

    Default Re: FWD disengage issue

    I have something similar: if I try to take it out of 4wd, sometimes there is resistance until I let the tractor roll forward slightly to release tension in the drivetrain. I wonder if you may be forcing the lever down and then even though the lever is down, the 4wd is not disengaged, and then once the tension in the drivetrain releases due to the tractor rolling, it disengages?

  3. #3
    Bronze Member
    Join Date
    May 2009
    Posts
    86
    Location
    Whitehorse, Yukon Territory, Canada
    Tractor
    Bobcat CT335 with cab

    Default Re: FWD disengage issue

    There is no lever in the HST drives. It is a toggle switch that I assume turns the power on/off to a solenoid that engages/disengages the FWD. Though I've had no luck actually locating this solenoid if that is what is used to disengage the FWD.

  4. #4
    Platinum Member
    Join Date
    Jun 2007
    Posts
    667
    Location
    So. Maine
    Tractor
    Kioti 3054xs TLB

    Default Re: FWD disengage issue

    If your tractor is equipped with a loader, use it to releave the pressure of the front tires on the ground, and then operate the 4wd switch; should come out of front drive easily
    2004 3054xs
    1231 FEL
    Markham tooth-bar
    2376 BH, 9 and 18 inch buckets
    DR PTO chipper
    Blizzard B74 sno-blower
    250 hrs

  5. #5
    Elite Member
    Join Date
    May 2012
    Posts
    2,872
    Location
    Knoxville, TN
    Tractor
    Bobcat CT225

    Default Re: FWD disengage issue

    Quote Originally Posted by afoster View Post
    There is no lever in the HST drives. It is a toggle switch that I assume turns the power on/off to a solenoid that engages/disengages the FWD.
    I beg to differ. It certainly feels to me like a mechanical linkage.

  6. #6
    Veteran Member SSdoxie's Avatar
    Join Date
    Jun 2010
    Posts
    1,911
    Location
    Cumberland Plateau, TN
    Tractor
    Bobcat CT225

    Default Re: FWD disengage issue

    Quote Originally Posted by joshuabardwell View Post
    I beg to differ.
    The OP has 335 and like the 4xx models & DK Kioti 4wd uses electric solenoid to engage/disengage. The 2xx models have manual lever.
    Dennis

    CT225 w/7TL QA FEL, 60"tooth dirt bucket, 68" smooth bucket, Pallet Forks, Bale Spear. Hydrualic top llin, QH, 48 RC, 60" tiller, Angle blade, Landscape rake, Carry-all, Post hole auger.

  7. #7
    Elite Member
    Join Date
    May 2012
    Posts
    2,872
    Location
    Knoxville, TN
    Tractor
    Bobcat CT225

    Default Re: FWD disengage issue

    Quote Originally Posted by SSdoxie View Post
    The OP has 335 and like the 4xx models & DK Kioti 4wd uses electric solenoid to engage/disengage. The 2xx models have manual lever.
    Ahhhh. Well, that makes sense then.

    How do the 3XX and 4XX handle the "tension in the drivetrain prevents 4wd disengage" situation then? Does it just wait and then disengage whenever the tension is relieved?

  8. #8
    Bronze Member
    Join Date
    May 2009
    Posts
    86
    Location
    Whitehorse, Yukon Territory, Canada
    Tractor
    Bobcat CT335 with cab

    Default Re: FWD disengage issue

    I've got a couple hundred hours on this tractor and I never noticed this happening till just recently. I'm hoping its just an adjustment to the solenoid or maybe a poor wiring connection, but as I mentioned earlier I've had no luck actually finding the solenoid and I'm starting to wonder if its housed inside the transmission housing. Anyone with experience on the Ct335 with this issue.

  9. #9
    Veteran Member SSdoxie's Avatar
    Join Date
    Jun 2010
    Posts
    1,911
    Location
    Cumberland Plateau, TN
    Tractor
    Bobcat CT225

    Default Re: FWD disengage issue

    It uses hydraulic pressure from the charge pump circuit to shift into 4wd and return spring to disengage when pressure is released by turning switch off. I haven't been inside one of these but believe it is a small cylinder that takes place of the manual shift fork that pushes and hold the gear into engage front axle drive. What OP is likely experiencing is tension remaining on the gear so spring can't pull it back until he starts to move and pressure on the gears release.
    Dennis

    CT225 w/7TL QA FEL, 60"tooth dirt bucket, 68" smooth bucket, Pallet Forks, Bale Spear. Hydrualic top llin, QH, 48 RC, 60" tiller, Angle blade, Landscape rake, Carry-all, Post hole auger.

  10. #10
    Gold Member
    Join Date
    Mar 2012
    Posts
    363
    Location
    NSW Australia
    Tractor
    Tractors16-600hp Farm & Earthmoving Equip, Trucks etc.

    Default Re: FWD disengage issue

    Reversing a short distance prior to/or post shifting from FWA can assist with disenagement.

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