B7800 stalls please help
dmnsmith5
Join Date: Sep 2006 Posts: 8 Alabama |
2006-09-30 135586
I have a B7800 FEL,MMM 85 hours. The engine is stalling when the tractor is moving either forward or backward. I can keep it from dying if I push the clutch in. It will idle at any RPM while sitting still and not die. It seems to stall quicker if I am going in reverse. I can travel forward a longer period before it stalls. Any ideas or help would be greatly appreciated. Thanks in advance!
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B7800 stalls please help
kwschumm
Join Date: Feb 2003 Posts: 5764 NW Oregon Pics |
2006-09-30 135588
Any smoke? Often these problems are filters, air or fuel, or bad/contaminated fuel. Look for water in the glass fuel bowl. ....
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B7800 stalls please help
dmnsmith5
Join Date: Sep 2006 Posts: 8 Alabama |
2006-09-30 135589
Yes, when I put the cutch in to prevent it from dying, there is a puff of black smoke. ....
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B7800 stalls please help
dmnsmith5
Join Date: Sep 2006 Posts: 8 Alabama |
2006-09-30 135590
Also, the fuel that is in the tank now is 4-6 weeks old and is on 3/4 tank. ....
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B7800 stalls please help
DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada Pics |
2006-09-30 135597
Help me out here. The B7800 I am acquainted with has a HST.
So what is the clutch for? ....
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B7800 stalls please help
dmnsmith5
Join Date: Sep 2006 Posts: 8 Alabama |
2006-09-30 135600
I guess its for starting purposes and swapping from L M or H speeds. Also used for engaging PTO and 4wd. ....
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B7800 stalls please help
DennisCTB
Join Date: Nov 1998 Posts: 2707 NorthWest NJ Pics |
2006-10-01 135604
Is the parking brake set ? Sounds like there might be some resistance somewhere if it is not casued by the other things already mentioned. ....
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B7800 stalls please help
dmnsmith5
Join Date: Sep 2006 Posts: 8 Alabama |
2006-10-01 135611
No, the parking brake is not set. I have driven in the past with it on, however it did not stall. This was only in low and medium speeds, never High. ....
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B7800 stalls please help
kwschumm
Join Date: Feb 2003 Posts: 5764 NW Oregon Pics |
2006-10-01 135612
Fuel can be stale right from the station. It really sounds like fuel or air starvation. Another possibility is loose material in the tank interfering with the fuel pickup. I add stabil to fuel cans before filling them up, then use a water filtering funnel when filling the tank, then add power service to the tank. Don't want any algae getting started. ....
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B7800 stalls please help
Peters
Join Date: Feb 2002 Posts: 3034 Northern AL Pics |
2006-10-01 135616
As Ken says it definately could be dirt in the tank and filter. It would have to come from the station with the low house on the tractor.
The timing could be out also but this is not likely unless it has been bumped recently.
Both these would sound like missing engine.
It could also be something binding in the transmission or brakes not releasing. In this case you will hear the engine begin to labour. ....
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B7800 stalls please help
Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York Pics |
2006-10-02 135624
You just made light of something different, that it happens only in high range? Could you be leaving the hydro petal to far depressed for the conditions? ....
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B7800 stalls please help
Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada Pics |
2006-10-02 135627
I think Art is on the right track, if it was an obstruction, dirt, etc., causing to starve for fuel, there would be no black smoke after stepping on the clutch.
It sounds more like the engine is being lugged into a stall.
Best of luck.
....
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B7800 stalls please help
kwschumm
Join Date: Feb 2003 Posts: 5764 NW Oregon Pics |
2006-10-02 135628
It wasn't entirely clear but didn't he say it stalled in low and medium and not high (?) or was that just the parking brake thing? ....
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B7800 stalls please help
dmnsmith5
Join Date: Sep 2006 Posts: 8 Alabama |
2006-10-02 135629
Stall while driving in Low or Medium with or without MMM PTO running. It does not sputter or hesitate, just a complete stall (unless clutch is engaged). Its as if the key is being turned off. The puff of black smoke comes when I engage the clutch so it won't die. ....
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B7800 stalls please help
Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada Pics |
2006-10-02 135630
The puff of black smoke is telling.
Black smoke from a diesel is a sure sign it's working hard and running rich.
Does the tractor stall no matter how slowly you step down on the pedal, or regardless of how far down, or not, you push on the pedal?
It's beginning to sound like the relief valve is not working, or there is a blockage somewhere and so anything beyond neutral is more pressure than it can take.
Best of luck. ....
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B7800 stalls please help
Peters
Join Date: Feb 2002 Posts: 3034 Northern AL Pics |
2006-10-02 135638
From the description it could also be just a loose wire or short on the fuel soleniod. It shuts down and sputters and then when the clutch is depressed before it winds down it catches back up. This would not explain the puff of smoke unless you get extra fuel when it opens back up.
It certainly sounds like the tractor's transmission is binding up somehow. ....
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B7800 stalls please help
Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York Pics |
2006-10-02 135639
Does it stop quickly when you engage the clutch? ....
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B7800 stalls please help
Peters
Join Date: Feb 2002 Posts: 3034 Northern AL Pics |
2006-10-27 136373
Did we get any more information on this problem? ....
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