This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
The Forum Parts and Services Unofficial Allis Store Tractor Shows Serial Numbers History
Forum Home Forum Home > Allis Chalmers > Farm Equipment
  New Posts New Posts
  FAQ FAQ  Forum Search   Events   Register Register  Login Login


Agco Allis 6690
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
Ryan Renko View Drop Down
Orange Level
Orange Level
Avatar

Joined: 12 Sep 2009
Location: Edwardsville, I
Points: 2326 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan Renko Quote  Post ReplyReply Direct Link To This Post Topic: Agco Allis 6690
    Posted: 10 May 2012 at 9:18pm
We have a small problem and looking for an answer. The tractor has about 600 hours on it and very well maintained and always shedded. Not always but about 50% of the time when you start it , it may run for several seconds but then seem to be starving for fuel and sometimes die. You try to start it again and it might hesitate but then run great all day. We use only the cleanest fuel, checked and cleaned the fuel bowl, rebuilt the fuel pump with Agco kit, and have a new fuel filter on it. I'm stumped. Why will it start half the time with no problem at all and the other times it will stutter and die on us?? Thanks in advance !! Ryan
Back to Top
Sponsored Links


Back to Top
JohnCO View Drop Down
Orange Level
Orange Level
Avatar

Joined: 11 Sep 2009
Location: Niwot Colo
Points: 8992 		Post Options Post Options   Thanks (0) Thanks(0)   Quote JohnCO Quote  Post ReplyReply Direct Link To This Post Posted: 10 May 2012 at 11:39pm
I'm just guessing but I think you have a tiny leak in the fuel line from the tank to the fuel pump.  Had the same problem with a Kubota M110.  Found a rodent had bit into the rubber fuel line under the cab.  Drove me nuts for several months before I put air pressure from the fuel pump to the tank, blew diesel out under the cab, ahaa!
"If at first you don't succeed, get a bigger hammer"
Allis Express participant
Back to Top
Ryan Renko View Drop Down
Orange Level
Orange Level
Avatar

Joined: 12 Sep 2009
Location: Edwardsville, I
Points: 2326 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan Renko Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2012 at 7:10pm
Thanks John!! I'm really pulling my hair out with this problem. Thats the first thing I will check tomorrow. Ryan
Back to Top
Orange Blood View Drop Down
Orange Level
Orange Level
Avatar

Joined: 29 Nov 2010
Location: ColoradoSprings
Points: 4053 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Orange Blood Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2012 at 7:34pm
It really does sound like air getting into the feed side of the Injection Pump.  Remember air can get in before fuel can get out, so the line doesn't have to leak fuel to have a hole in it.
Still in use:
HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060
Projects: 3-U UC 2-G 2-B 2-C CA 7-WC RC WDLP WF D14 D21 210 7045 N7
Back to Top
Bolivar Boy View Drop Down
Orange Level
Orange Level


Joined: 27 Dec 2011
Location: wooster, ohio
Points: 641 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Bolivar Boy Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2012 at 8:42pm
am doubtful about a fuel line leak on the supply side. why does it run perfect the rest of the day after the initial hesitation? is the run perfect condition @ wide open throttle or reduced rpm? would think there is an issue of flow restriction from the tank causing the initial hesitation. also, perform a cold test start up with the fuel cap in a loose position. monitor results.
Back to Top
Ryan Renko View Drop Down
Orange Level
Orange Level
Avatar

Joined: 12 Sep 2009
Location: Edwardsville, I
Points: 2326 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ryan Renko Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2012 at 8:58pm
I did talk the cap off and took it apart to make sure the spring breather wasnt stuck. It was ok. The hesitation or stalling might happen immediately or sometimes several seconds after start. Sometimes it will not happen at all!! Does it depend on where the engine crank or cam stopped the previous time meaning a leak in the injection system by loosing pressure or???????? All help will be appreciated!!!!!! Ryan
Back to Top
Amos View Drop Down
Orange Level
Orange Level


Joined: 11 Sep 2009
Location: Ontario
Points: 1318 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Amos Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 2012 at 9:51pm
I am not familiar with the 6690, but am with a 5660 and 5680.  We had the same problem as you with the 5660 after it had a couple thousand hours on it.  The sediment bowl had always been dirty on it and we lived with it starting, stalling and starting back up till one day the banjo bolt worked completely loose that holds the bowl on (and the supply line to the bowl) and she would not run.  One of the copper washers had a dark line across it like it had been leaking, I changed it and it never has failed to start and stay running since...well...except when it ran out of fuel a couple times...lol
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 11.10
Copyright ©2001-2017 Web Wiz Ltd.

This page was generated in 0.094 seconds.


Help Support the
Unofficial Allis Forum