Results 1 to 7 of 7
  1. #1
    Platinum Member
    Join Date
    Aug 2004
    Posts
    581
    Location
    Northcentral Florida
    Tractor
    Bobcat Toolcat High Flow Turbo C-series

    Default Motor slowly revs down to zero

    I wonder if anyone else has had this problem. After I've been mowing for several hours, without any warning, the motor revolutions start going down slowly until the motor totally stops. Electrically, the Toolcat is still turned on, with indicator lights on and the aux hydraulics light still on, but revs at '0'. I have to push the red 'off' button to turn it off and then the 15 second count down before re-start begins to tick down. If I wait a few minutes, I can get the motor to start again and everything works. But after it happens once, it begins to happen more frequently and I have to stop working. I have the Rev 'C' 5600. I hope someone can give me a clue as to what might be going on, because I'm not getting the error exclamation mark light or any error code.
    "The Earth is just too small and fragile a basket for the human race to keep all its eggs in." - Robert A. Heinlein

  2. #2
    Elite Member DT86's Avatar
    Join Date
    Dec 2010
    Posts
    3,141
    Location
    SW VA
    Tractor
    Kubota 9540, RTV 900 and David Brown 885.

    Default

    Quote Originally Posted by Rolando
    I wonder if anyone else has had this problem. After I've been mowing for several hours, without any warning, the motor revolutions start going down slowly until the motor totally stops. Electrically, the Toolcat is still turned on, with indicator lights on and the aux hydraulics light still on, but revs at '0'. I have to push the red 'off' button to turn it off and then the 15 second count down before re-start begins to tick down. If I wait a few minutes, I can get the motor to start again and everything works. But after it happens once, it begins to happen more frequently and I have to stop working. I have the Rev 'C' 5600. I hope someone can give me a clue as to what might be going on, because I'm not getting the error exclamation mark light or any error code.
    I don't know anything about the Toolcat other than I wish I had one But it sounds to me like a fuel problem. Meaning that you aren't getting enough. We had a tractor with similar problems.

    Does your machine have a supply pump or does it just gravity feed from the tank to the injection pump?

  3. #3
    Platinum Member DEWFPO's Avatar
    Join Date
    Jun 2007
    Posts
    695
    Location
    "High in the Rockies"

    Default Re: Motor slowly revs down to zero

    If your engine is hot, you shouldn't have to wait any amount of time to start. I don't know if they're any different but my "D" series will often start immediately on hot days with a 'cold' engine. Zero glow plug time.

    Does the engine itself die slowly (over several seconds), or just shut off? I assume no diagnostic code is showing up.

    My first WAG is fuel starvation but it could be a number of things. Next time it stalls, loosen the fuel filler cap and listen if you get any suction sound.

    DEWFPO
    2009 Toolcat 5600 "D-Series", Hi-Flow, 29's, 72" SB-200, 84" Snowblade, 62" Lo-Pro Bucket

    SOLD - 2006 MF GC2300, 2350 FEL, 2315 MMM, 2360 SB, KingKutter CarryAll

  4. #4
    Platinum Member
    Join Date
    Aug 2004
    Posts
    581
    Location
    Northcentral Florida
    Tractor
    Bobcat Toolcat High Flow Turbo C-series

    Default Re: Motor slowly revs down to zero

    Quote Originally Posted by DEWFP0 View Post
    1f your engine is hot, you shouldn't have to wait any amount of time to start. I don't know if they're any different but my "D" series will often start immediately on hot days with a 'cold' engine. Zero glow plug time.
    Perhaps I didn't make myself clear, There's no glow plug time issue. If I re-start right away, it starts to die out again very soon. If I wait a few minutes before re-starting, it's likely to run okay for another thirty or forty minute before dying out again. But the problem reoccurs more frequently the more times I have to re-start.

    Does the engine itself die slowly (over several seconds), or just shut off? I assume no diagnostic code is showing up.
    The engine dies slowly rather than shutting off abruptly. And like I said, I have to hit the shut off button before re-starting because electrically, it looks like the machine is still turned on.

    My first WAG is fuel starvation but it could be a number of things. Next time it stalls, loosen the fuel filler cap and listen if you get any suction sound,
    It does sound like the fuel is slowly being cut off. But the engine will re-start after the 15 second countdown. Does your 'D' not not do this? When I turn off my machine, the display shows a 15 second countdown before the gauges go down to neutral, I assumed you should wait that out until you re-start the engine. But I guess that could be a time delay for the lights to stay on until you can reach a switch. Never looked it up.

    Next time the problem happens, I'll check the vacuum at the fuel cap and report back,
    "The Earth is just too small and fragile a basket for the human race to keep all its eggs in." - Robert A. Heinlein

  5. #5
    Platinum Member
    Join Date
    Aug 2004
    Posts
    581
    Location
    Northcentral Florida
    Tractor
    Bobcat Toolcat High Flow Turbo C-series

    Default Re: Motor slowly revs down to zero

    Quote Originally Posted by DT86 View Post
    Does your machine have a supply pump or does it just gravity feed from the tank to the injection pump?
    I have very limited mechanical knowledge, I'm afraid. I believe it has a fuel pump.
    "The Earth is just too small and fragile a basket for the human race to keep all its eggs in." - Robert A. Heinlein

  6. #6
    Platinum Member DEWFPO's Avatar
    Join Date
    Jun 2007
    Posts
    695
    Location
    "High in the Rockies"

    Default Re: Motor slowly revs down to zero

    Quote Originally Posted by Rolando View Post
    It does sound like the fuel is slowly being cut off. But the engine will re-start after the 15 second countdown. Does your 'D' not not do this? When I turn off my machine, the display shows a 15 second countdown before the gauges go down to neutral, I assumed you should wait that out until you re-start the engine. But I guess that could be a time delay for the lights to stay on until you can reach a switch. Never looked it up.

    Next time the problem happens, I'll check the vacuum at the fuel cap and report back,
    I've only stalled the engine on my "D" once, that was in winter when I didn't realize the fan on the snownblower was frozen with ice. The engine was at idle and not fully warmed up yet. When I engaged the blower the engine immediately died. I was able to restart it instantly without having to wait for any period of time. Any other time I start the engine hot, there is no waiting period of any kind.

    DEWFPO
    2009 Toolcat 5600 "D-Series", Hi-Flow, 29's, 72" SB-200, 84" Snowblade, 62" Lo-Pro Bucket

    SOLD - 2006 MF GC2300, 2350 FEL, 2315 MMM, 2360 SB, KingKutter CarryAll

  7. #7
    Elite Member DT86's Avatar
    Join Date
    Dec 2010
    Posts
    3,141
    Location
    SW VA
    Tractor
    Kubota 9540, RTV 900 and David Brown 885.

    Default

    It sounds to me like either the tank isn't venting properly or there is a blockage in the bottom of the tank. Either way this would cause the injection pimp to starve and the engine to slowly die.

    As mentioned already you should be able to hear sucking in the tank as it overcomes the vacuum.

    If you can remove the fuel cap quickly while it is in the process of dying and it recovers then you have a vent issue.

    You can remove the fuel line from the filter and blow air back into the tank if you think the line is clogged with junk. If it runs fine after then I would clean the tank.
    Last edited by DT86; 08-29-2012 at 07:51 PM.

Similar Threads

  1. Need Help On 316 Over revs
    By Firepuppy in forum John Deere Lawn & Garden
    Replies: 3
    Last Post: 04-10-2012, 10:10 PM
  2. 4310 smells at high revs lately
    By adegiulio in forum John Deere Owning/Operating
    Replies: 6
    Last Post: 06-22-2010, 01:49 AM
  3. Loader slowly going down
    By Texas Dodge in forum Kubota Owning/Operating
    Replies: 8
    Last Post: 07-17-2008, 09:42 PM
  4. Rookie needs advice: Low revs? Kubota B2710
    By muzzleblaster in forum Kubota Owning/Operating
    Replies: 13
    Last Post: 06-16-2005, 04:40 PM
  5. Eengine automatically revs up at starting?
    By gabby in forum Kubota Owning/Operating
    Replies: 9
    Last Post: 12-15-2004, 07:31 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2014 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.