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  1. #1
    Elite Member Chilly807's Avatar
    Join Date
    Sep 2009
    Posts
    3,256
    Location
    Nova Scotia
    Tractor
    Kubota L3400DT

    Default L3400 running backwards !

    Some of you are going to find this hard to believe, but it happened.

    Today I was using a log winch to pull some alders out, roots and all. The tractor (09 L3400) was idling with the PTO engaged running the winch. It doesn't usually take a lot of power to pull alders. One bunch was harder than the rest to pull, ended up getting lodged between 2 trees. By the time I noticed, it had dragged the rpm down to just about the stall point before I let the winch rope go to unload the engine. It stayed running, although the idle sounded slightly lower than normal.

    Being stubborn, I pulled the winch rope to re-engage the winch and try pulling the alders again, figuring they might have loosened the first time. This time, the winch did nothing, the cable didn't even move. Thinking that was odd, since there had been no expensive-sounding crunch or snap, I looked to be sure the PTO was still engaged and turning, which it was. I didn't realize it was turning the wrong way. I pulled the winch rope again, still nothing.

    By this time, I was scratching my head, saying "What the hel* is going on here??" I looked at the tach to see what the rpm was, since it still sounded slow. It was low all right, it was reading zero. Nada. Nothing... then I noticed that the oil pressure warning light was on, and the light bulb in my head went on too.. No rpm showing, winch didn't work, no oil pressure... "The **** thing is running backwards!" The crank must have stopped for a split second, then compression pushed it back the other way and it fired in the wrong rotation, just like an old make-and-break engine.

    Luckily, the key shut it off right away, total run time (backwards) was probably about 30 seconds. No big deal at idle, likely little to no bearing damage. I restarted the engine, everything acted normal. Shut it down, pulled the air filter, which although smelling distinctly like exhaust since it had been acting like a muffler, was clean and not damaged.

    The bird's nest in the winch took me about an hour to get untangled (never turn one of those the wrong way, trust me on this!)

    I called my dealer and told them what happened, just for their information. They said they'd heard of some older Deere's doing the same thing, but this was the first kubota they'd ever heard of doing it. Leave it to me to be the one to discover it was possible!

    Lucky I didn't walk back to free up the alder clump and leave the engine idling, no oil pressure for 5-10 minutes would have been enough to do serious damage.

    Other than the slow idle and the oil pressure light, there were no indications of a problem, no rattling or poor idle, it was smooth but slow.

    Interesting day, but not one I'd recommend trying at home!

    Next time I'll run the engine at a higher speed, more pulling power and more room to drop before it gets to the stall point.

    Sean

  2. #2
    Super Member
    Join Date
    Feb 2011
    Posts
    8,426
    Location
    Frederick County, VA
    Tractor
    Kubota BX2360 & L4240 HSTC

    Default Re: L3400 running backwards !

    Your right the engine ran out of power and compression kicked it back and made it run backwards.

    I know a guy who had that happen on a New Holland. He is one of those people that use a rough cut at 1200 rpms. He was mowing a steep hill that a goat would not climb and ran it out of power and the engine ran backwards.

  3. #3
    Elite Member
    Join Date
    Dec 2007
    Posts
    3,204
    Location
    texas
    Tractor
    7040 HDC 1153 fel

    Default Re: L3400 running backwards !

    running backwards is not a big deal.you just bumped the heack out of the motor pulling that log thus causing the motor to run backwards.an it ran fine when you cranked it again.

  4. #4
    Veteran Member Deano's Avatar
    Join Date
    Oct 2008
    Posts
    1,237
    Location
    Southern Maryland
    Tractor
    Kubota BX24

    Default Re: L3400 running backwards !

    WOW!!
    Deano
    2006 BX24, 6' Modern Implements rake, Woods RB60 rear blade, Wallenstein thumb, Bro-Tek rear skid plate, home made front skid plate, W.R. Long flat tooth bar, 4' finishing mower (TPH), 4' box blade, post hole digger, New style seat!!!!!, Agri-Fab drop spreader.

  5. #5
    Silver Member indianaEPH's Avatar
    Join Date
    Sep 2006
    Posts
    230
    Location
    South Central Indiana
    Tractor
    Kubota M59

    Default Re: L3400 running backwards !

    im a bit amazed. Im trying to think of what type of fuel injection system would let this happen?
    M59 TLB, 66" HD Grapple, Woods 72" BB, Kubota Trencher, Stump Bucket, Taylor 72" Box Blade, 7 ft back blade, woods 7 ft rock rake.

  6. #6
    Epic Contributor k0ua's Avatar
    Join Date
    Jun 2009
    Posts
    24,420
    Location
    Branson, Mo.
    Tractor
    Kioti DK35se Hydrostat

    Default Re: L3400 running backwards !

    Wow, Sean, that is a first that I have heard of for a 'bota. Man, that can't be a "good thing", bound to have put a few "hours" on the bearings and other lubricated parts.

    James K0UA
    James K0UA

    Kioti DK35se hydrostat with 2 QA buckets, 48 inch. King Kutter Rotary Cutter. 750 lbs ballast box. Loaded tires, Construction Attachments SSQA Lightweight Pallet forks. EA 50 inch single lid "wicked" Grapple. Satisfied Everlast PA160 welder owner NRA Life Member How to add a link to a post . Best way to search TBN .


  7. #7
    Super Member crazyal's Avatar
    Join Date
    Dec 2003
    Posts
    6,414
    Location
    Northern Vermont

    Default Re: L3400 running backwards !

    I don't do anything at idle. It's just not a place the engine was designed to operate at while doing work.
    Kubota L4240,Case 580K backhoe, Case 450 Dozer

  8. #8
    Super Member
    Join Date
    Feb 2011
    Posts
    8,426
    Location
    Frederick County, VA
    Tractor
    Kubota BX2360 & L4240 HSTC

    Default Re: L3400 running backwards !

    Here is a engine that runs either way.
    1921 Lanz Tractor Reversing Engine Rotation - YouTube

  9. #9
    Veteran Member ccsial's Avatar
    Join Date
    Jun 2005
    Posts
    1,604
    Location
    NorthWest Illinois
    Tractor
    (Kuboto L3400) (Ford 1910 4WD w/FEL) (Deere X748SE) All bought new

    Default Re: L3400 running backwards !

    "im a bit amazed. Im trying to think of what type of fuel injection system would let this happen?"

    Mechanical.

    With EFI the crankshaft position sensor would be going the wrong way so the CPU could shut off the fuel.
    Kubota L3400-HST, Ford 1900-Gear FEL, John Deere X748SE

  10. #10
    Veteran Member
    Join Date
    Jun 2012
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    1,088
    Location
    Sno WA
    Tractor
    JD 950

    Default Re: L3400 running backwards !

    Quote Originally Posted by 94BULLITT View Post
    Here is a engine that runs either way.
    1921 Lanz Tractor Reversing Engine Rotation - YouTube
    Big reversing diesels were once common on ships. For all I know, they may still be

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