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  1. #1
    Gold Member
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    Feb 2003
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    304
    Location
    western pa.
    Tractor
    12g gravely,pt 422

    Default repower

    Hi guys it's been a long time,but i had nothing going wrong. Now i think i would like a new engine,the robin 25 would be simple but the kohler may be a better deal.The problems are the wiring,has anybody did this before?the fab. of the mounts is no big deal but the wiring change from the robin 22 to the kohler has me stumped......jim

  2. #2
    Super Star Member J_J's Avatar
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    Sep 2003
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    17,369
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: repower

    Quote Originally Posted by johara1 View Post
    Hi guys it's been a long time,but i had nothing going wrong. Now i think i would like a new engine,the robin 25 would be simple but the kohler may be a better deal.The problems are the wiring,has anybody did this before?the fab. of the mounts is no big deal but the wiring change from the robin 22 to the kohler has me stumped......jim
    The change over should not be a problem. Each Kohler engine should include an owners manual, that has the wiring diagram for the electrics. You should use Kohler's ign switch. so you don't burn up the wiring. There are a lot of those similar ign switches around and if used with the wrong switch, bad things could happen. The one on your machine might be the same, but I would test the configuration for the switch and plug.To bad you can't use a Kohler 25 HP vertical engine, you can get them for about $700.00.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  3. #3
    Gold Member
    Join Date
    Feb 2003
    Posts
    304
    Location
    western pa.
    Tractor
    12g gravely,pt 422

    Default Re: repower

    JJ,what about all the other wiring on the tractor? would it be the same? i would like to see a wiring diagram for the kohler,i have the one for robin.
    i was thinking of getting a kohler with the controls and switch on it and just move it to the front.that way i wouldn't make a mistake.........jim

  4. #4
    Epic Contributor MossRoad's Avatar
    Join Date
    Aug 2001
    Posts
    24,169
    Location
    South Bend, Indiana (near)
    Tractor
    Power Trac PT425 2001 Model Year

    Default Re: repower

    Quote Originally Posted by johara1 View Post
    Hi guys it's been a long time......jim
    Welcome back!
    MossRoad

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  5. #5
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    17,369
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: repower

    Quote Originally Posted by johara1 View Post
    JJ,what about all the other wiring on the tractor? would it be the same? i would like to see a wiring diagram for the Kohler,i have the one for robin.
    i was thinking of getting a Kohler with the controls and switch on it and just move it to the front.that way i wouldn't make a mistake.........jim
    Jim.

    I agree with your plan. Just make up a wiring harness from the motor to the front. Maybe 4 wires.

    Go to the Kohler web site, and specify the engine, and I am sure you can download the manuals.

    As far as all the wiring on the PT, there is probably a common point for the 12v accessories, and there is an accessories lug on the back of the Kohler switch.


    http://www.kohlerengines.com/manuals/landing.htm

    26 hp page 98 of 232.

    There are other engines on this link, so go to the right and select the owners or service manusl for the engine you want.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  6. #6
    Gold Member
    Join Date
    Feb 2003
    Posts
    304
    Location
    western pa.
    Tractor
    12g gravely,pt 422

    Default Re: repower

    JJ,sounds like a plan,thanks..
    MR,do you have the wiring print for your 425? so i can compare it to my robin print? you know it's been a couple years,i'm retired looking for something to do like a big motor.....jim

  7. #7
    Elite Member SnowRidge's Avatar
    Join Date
    Jul 2003
    Posts
    3,091
    Location
    East Tennessee
    Tractor
    Power Trac PT-425 / Branson 3520

    Default Re: repower

    I think it would be a whole lot easier to install a new Robin and be done with it.

    Kohlers are not trouble free engines. If you go to somewhere like http://www.lawnsite.com, you will find that they have their issues like all brands. The CH25s have a history of bad valve lifters and dropped valve seats. Mine has dropped a valve seat twice, once under warranty, and once on my nickel.

    If I ever have to repower my PT-425, I won't switch engine brands. It's just too much work for no gain. The electrical hook up would be the easy part. Fabricating and/or locating and purchasing the various mounts, rigging the exhaust, checking and verify clearances, routing or rerouting hoses if necessary, would all be a real PITA. And there is always the possibility of making a serious mistake along the way that won't reveal itself until much later.

    Now if the replacement engine was a diesel, that would be another matter. Then it would be oh so worth it.

  8. #8
    Gold Member
    Join Date
    Feb 2003
    Posts
    304
    Location
    western pa.
    Tractor
    12g gravely,pt 422

    Default Re: repower

    SnowRidge, that may be true, i was thinking of the 25 hp robin if i go that route,but you still have the starting issue. i now keep it in a heated building in the winter. i guess thats not a issue anymore.......jim

  9. #9
    Epic Contributor MossRoad's Avatar
    Join Date
    Aug 2001
    Posts
    24,169
    Location
    South Bend, Indiana (near)
    Tractor
    Power Trac PT425 2001 Model Year

    Default Re: repower

    Quote Originally Posted by johara1 View Post
    JJ,sounds like a plan,thanks..
    MR,do you have the wiring print for your 425? so i can compare it to my robin print? you know it's been a couple years,i'm retired looking for something to do like a big motor.....jim
    I'll have to look. Its been many years since I looked in the PT supplied manual. Had no trouble, so no need to look. ( I'll regret saying that! )

    I purchased manuals for my Kohler from a local engine shop.
    MossRoad

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    Of It In Action!!!


  10. #10
    Epic Contributor MossRoad's Avatar
    Join Date
    Aug 2001
    Posts
    24,169
    Location
    South Bend, Indiana (near)
    Tractor
    Power Trac PT425 2001 Model Year

    Default Re: repower

    I always wondered why you couldn't power it off of a belt drive instead of a direct connection to the engine shaft? That way, you could run it off of just about any engine available, like a Chevy 153 straight 4 from the 60s. Simple as simple gets and would last a lifetime in these machines.
    MossRoad

    Click On My Little Tractor
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    Of It In Action!!!


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