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Allis Chalmers Discussion Forum

AC 185 Diesel

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Author  [Modern View]

07-05-2012 18:00:31

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What would make an AC185 hunt or surge for fuel when at an idle position. When you speed it up it quits hunting. It's my friends tractor and he said it has a new fuel pump. Thanks Gregg.

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07-08-2012 08:04:20

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 Re: AC 185 Diesel in reply to cuttman, 07-05-2012 18:00:31  
Thanks for the replys, I will give him the advice. I think I'm gonna suggest taking back to dealer and let them look at it.

The pump was professonially rebuilt supposedly.

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charles todd

07-07-2012 22:40:08

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 Re: AC 185 Diesel in reply to cuttman, 07-05-2012 18:00:31  
If it has a Roosta-Master, I think it is a pump issue. My 180 does this sometimes. Sometimes at idle, sometimes at rated speed. I think it is the rubber coated disc in the injector pump is coming apart. I plan to pull all injectors and pump to have them overhauled. Sorry, it's about $1000 to do all of this. $600+ for just a pump.


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farmer boy

07-07-2012 10:07:43

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 Re: AC 185 Diesel in reply to cuttman, 07-05-2012 18:00:31  
Our 185 does exactly the same thing. It will smooth out as you increase the rpm(completely smooth at around 1200 rpm?) but never stalls and still has decent power for idle. I've read that there is an o-ring in there that wears down but don't know for sure.

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07-07-2012 03:49:18

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 Re: AC 185 Diesel in reply to cuttman, 07-05-2012 18:00:31  
When you say new fuel pump, do you mean injector? Sounds like the plastic drive coupler inside the injector pump is starting to wear away. My 190XT started to do this. My former AC dealer replaced the ring inside for less than 200 dollars[r&r pump myself]. Best to do soon before plastic pieces start plugging stuff up inside the Roto-Master pump....Ron

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07-06-2012 12:19:50

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 Re: AC 185 Diesel in reply to cuttman, 07-05-2012 18:00:31  
This may not be the answer you want,but I think that is the nature of the beast(185s).They have -had a very touchy governor and everyone I have been around(Dads new to 5000Hrs plus others)did the hunting bit under 1100-1200RPM but were fine over that.XTs-200s-7000s didn't do it but the 185s did.I"am not saying something can't be wrong but that was one quirk the 185s did have.

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07-06-2012 05:55:04

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 Re: AC 185 Diesel in reply to cuttman, 07-05-2012 18:00:31  
Check all the connections on the fuel lines, , they have rubber seals that get damaged and suck air, , id start at the tank for good flow, , then the filter and the connections, , but i bet its the rubber seals at the connections

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07-06-2012 03:17:57

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 Re: AC 185 Diesel in reply to cuttman, 07-05-2012 18:00:31  
Water in the fuel, would be my first guess. Have you checked the filters???

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