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  1. #41
    Epic Contributor MossRoad's Avatar
    Join Date
    Aug 2001
    Posts
    24,140
    Location
    South Bend, Indiana (near)
    Tractor
    Power Trac PT425 2001 Model Year

    Default Re: What to look for when testing a used machine

    Heck, see what the mechanic has to say about the engine before considering replacing it. It may be something simple like bad timing. Have the compression checked first. If it has good compression you can then figure if its a fuel issue or an electrical issue. Those issues are easily resolved and usually not that expensive. If the compression is bad, make sure the valves are set correctly. If it still has bad compression, ask your mechanic how much surgery can cost VS a replacement engine.
    MossRoad

    Click On My Little Tractor
    To See Pictures And Videos
    Of It In Action!!!


  2. #42
    Elite Member woodlandfarms's Avatar
    Join Date
    Jul 2006
    Posts
    4,270
    Location
    Los Angeles / SW Washington
    Tractor
    PowerTrac 1850

    Default Re: What to look for when testing a used machine

    Throttle cables go out on the PT's. Mine got gummed up over the years.
    Power-Trac 1850, grapple, hoe, 90" mower, 72" box blade

  3. #43
    Silver Member
    Join Date
    Jul 2011
    Posts
    188
    Tractor
    Steiner 430

    Default Re: What to look for when testing a used machine

    I just took my 422 to a very good small engine mechanic. We could not get it started. He is going to dive into further. I am hoping he can find the problem.

  4. #44
    Silver Member
    Join Date
    Jul 2011
    Posts
    188
    Tractor
    Steiner 430

    Default Re: What to look for when testing a used machine

    I stopped by the mechanics today. They can not get it started. Said they believe when the engine was rebuilt the fly wheel was tighten all the way and now she is out of time. Said they would have to pull the engine. They said it is backfiring through the carb and the exhaust. I called Terry at Power Trac and told him their findings, he didn't necessarily agree it was out of time.
    any thoughts?

  5. #45
    Platinum Member
    Join Date
    Jan 2005
    Posts
    650
    Location
    SW Virginia
    Tractor
    PT425

    Default Re: What to look for when testing a used machine

    My 2004 PT 425 has the Robin 25hp engine. It will backfire through the carb, flood and refuse to start if it's not cranking fast enough. It gets worse when the valves need to be adjusted, which happens more often than the maintenance schedule indicates. Cold weather makes it worse. Even with magnetic block heaters on the hydraulic tank and the tram pump, there have been times when the only way to get it started was to jump it with a running vehicle & heavy-duty jumper cables, plus starting fluid. I think the magneto just doesn't put out a strong enough spark if it cranks a little slowly.

    The battery, cables and starter were all marginal at best when new. I got an upgraded starter while it was under warranty, and have recently upgraded to a considerably larger battery and heavier cables. That has helped considerably.

  6. #46
    Silver Member
    Join Date
    Jul 2011
    Posts
    188
    Tractor
    Steiner 430

    Default Re: What to look for when testing a used machine

    Do you think the Robin Subaru 22hp or 25hp is the best engine that Power Trac can put in there machines? What good is the tractor if it won't start when you need it.

  7. #47
    Platinum Member tmarks11's Avatar
    Join Date
    May 2005
    Posts
    656
    Location
    Port Orchard, WA
    Tractor
    2005 Power Trac 422

    Default Re: What to look for when testing a used machine

    Quote Originally Posted by Frank Sorbello View Post
    Do you think the Robin Subaru 22hp or 25hp is the best engine that Power Trac can put in there machines?
    I think Robin has made improvements in the last few years which have helped resolve many of the starting problems.

    If my Robin 22 HP engine died, I would replace it with a Robin... the 27HP Fuel Injected variant.
    -----------------------------------------------------
    Now in Port Orchard, WA
    2005 PT-422
    4n1 bucket, minihoe, auger, 48" mower, land pride aerator, tow adaptor, forklift, crane, Herd GT77 spreader, LMB, 60" blade, M1 abrams turret.
    PT422 (6/23/05) photo page

  8. #48
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    17,357
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: What to look for when testing a used machine

    Has anyone set the valves correctly ????
    J.J.

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

    Git er done.

  9. #49
    Platinum Member tmarks11's Avatar
    Join Date
    May 2005
    Posts
    656
    Location
    Port Orchard, WA
    Tractor
    2005 Power Trac 422

    Default Re: What to look for when testing a used machine

    Quote Originally Posted by Frank Sorbello View Post
    ...now she is out of time. Said they would have to pull the engine.
    Pulling the engine is a bit drastic. I am with Terry on this one. Mechanic wants to pull the engine because he wants to see Top Dead Center on the flywheel to adjust the valves. Absolutely not required.

    Pull the valve covers. Pull the spark plugs. Soda straw in the cylinder through the spark plug hole, rotate the crankshaft by lightly goosing the starter switch until you see the cylinder at the top. Adjust the appropriate valve clearance (either intake or exhaust, whichever one is open). Repeat 3 more times. You don't need access to the flywheel, as valve adjustment is done at TDC. Timing adjustment should take 15 minutes.

    My PT422, when very cold, flooded out/backfired, refused to start. I was desperate, as was moving (to a new house) and had some heavy loads to shift in 20F weather. Pulled the plug, setup two space heaters and a few hours solved the problem.

    Cold hydraulic fluid=slow cranking=insufficient spark (as was stated above) leads to flooding out the engine, which makes it worse. Pull the plugs, let it sit overnight in the garage was a space heater blowing underneath/into the engine compartment, warm up the spark plugs with a propane torch, then try again.
    -----------------------------------------------------
    Now in Port Orchard, WA
    2005 PT-422
    4n1 bucket, minihoe, auger, 48" mower, land pride aerator, tow adaptor, forklift, crane, Herd GT77 spreader, LMB, 60" blade, M1 abrams turret.
    PT422 (6/23/05) photo page

  10. #50
    Silver Member
    Join Date
    Jul 2011
    Posts
    188
    Tractor
    Steiner 430

    Default Re: What to look for when testing a used machine

    Mechanic called today. He got it running. Adjusted the valves. They were loose. Said the bendix was stuck in the starter. Noticed one cylinder wasn't firing. Found a bad wire, that cuts off the engine has a short. Said the wire runs under the engine. He believes it isn't absolutely necessary to have the wire because the carburetor has a solenoid that can cut off the fuel to shut the engine. He really doesn't want to pull the engine if he doesn't have too.
    I will check it out tomorrow after work.

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