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I have an low idle problem with my 673 engine.When I first start it up I have to pull out the hand throttle to about 800 rpms or it will shut down, after it runs long enough to warm up it will idle at 700 rpm when I back out the idle screw to lower the speed it will hunt a little bit and stall it will not stay running under 700 rpm it don't help shifting I would hope I can fix this without taking the pump up to charley at Dunmore injection. new fuel filters new fuel lines injectors were checked all 6 were good. It runs fine and dandy down the road enough power for me but it is bugging me about the idle. If anyone can think of anything here is a big thank you. Dave

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You probably don't want to hear it,but sounds like the governor needs rebuilt.     terry:MackLogo:

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Sounds to me you have a plunger sticking and if so you can have a engine run away but a worn out governor can do same thing.The pump needs to be rebuilt.Those parts may be hard for them to find.

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On 9/2/2019 at 6:27 PM, AZB755V8 said:

I had that problem with one or two trucks. It was the fuel, sitting there for an extended time it started to turn bad by the smell in the tanks. Drained the fuel, changed the filter and ran them around for 60-70 miles and all was back to normal. Putting some good diesel fuel system cleaner in also helped. Do not start adjusting the pump for anything before checking the fuel. 

Plus one on what AZB says. When I was turning wrenches we ran into some real head scratchers that ended up being bad fuel.

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I have fresh fuel I keep steeling it out of the truck for my other tractors when i'm to lazy to run out to get 5 or 10 gallons.anything with fuel gets fuel additives. Yesterday I had a talk with a guy at a different injection shop told me the slip drive is shot he said he's been fixing injection pumps for 40 years and he seen and heard macks acting just the same as mine good news I have a pump ass. that the only good thing is that slip drive and some of the governor parts. I just wish I could take the governor of without taking the whole pump off.I guess I have seen stuff like this but I seem to forget people tell me you did this for me or I made parts for them and I don't remember any more. Back in the 70's I worked at a fleet garage and I worked on r's and f's with the 675's 

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1 hour ago, davehummell said:

this morning I took the pump to diesel power service out in Williamsport pa. I had a talk with the guy that does the pumps he is old enough to have worked on b 's for stroeman bread company . some one shimmed the high idle spring up so the low idle wouldn't work but I could get 2300 on high idle. I dropped the pump of at 11:30 and it was done by 2:45 I don't know how much but at this point I don't care. I thought the service was very good, pleasant people to deal with the guy explained a lot to me over the phone. I just thought I would give them an attaboy for not trying to over inflate the repairs I needed.

Nice to have somebody that has worked on them before.     terry:MackLogo:

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50 minutes ago, davehummell said:

I picked the pump up this morning and the bill was 118.00 I talked with the guy that did the work and he explained to me the high speed spring was shimmed about .100 to much. He thought some one might of tried to get more power out of the engine. He did some other adjustments said it was in good repair other than screwy settings.

be sure to let us know how it runs.    terry:MackLogo:

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I just finished putting the pump back on and it works just like it should really happy with that. I mounted a muffler on it that straight pipe was hard on my hearing and fixed an oil leak down on the air compressor. I am going to take it out to a car show tomarrow. I can recommend diesel power service the guy repaired and no leaks.

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