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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Oliver 77 RC Carb / governor problems

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Chuck

10-02-2004 19:30:35




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My newly aquired row crop 77 came with the governor disconnected and the throttle linked direct. Owner said governor needed work and when he tried using it it worked backwards trying to rev engine instead of idle down. After some research I found out that this is not the original carb and the linkage was 180 deg off from where the original would be...hence the reverse throttle. I also noticed this carb is quite a bit smaller than ones i've seen on 77's at local tractor pulls. So I fabricate an arm to allow me to point the linkage in the right direction, hook up the governor as i've seen on other 77's and it works. As soon as engine is running it returns to idle. When I throttle back she revs up but maintains a set rpm. BEAUTIFUL !! Know the problem...if I putt around on level ground at low throttle setting everything is good. As soon as I throttle up a bit and try to climb an incline she starts to surge then dies quickly. I've tried to watch governor activity during these stalling sessions but it doesnt seem to be doing anything erratic. It almost seems like it trys to apply some throttle but the carb doesnt deliver. Could this carb be too small ?? It seemed to deliver plenty when hooked up less governor. After stalling it takes a minute of cranking to refire, almost like the bowl has run dry. Tank, petcock and filter are all new and gas seems to flow fine. Float level looks good and carb is clean inside and out. Could the governor be a little overactive and stalling engine or is carb messed up. Thanks for your input and sorry for the long post.

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Chuck

10-07-2004 16:53:26




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 Re: Oliver 77 RC Carb / governor problems in reply to Chuck, 10-02-2004 19:30:35  
In trying to isolate the problem I have disconnected the governor again and hooked the linkage up solid. Being very careful not to over-rev the engine I drove the tractor at various throttle settings. Well I know believe the problem is with the transition circuit in the carb as when opening the throttle either under a load or not you have to be very slow and careful not to stall it. Obviously something is plugged and not allowing smooth transition to the main jet circuit. I can stall the tractor by just applying throttle from idle..no load. Like I mentioned I dont think this is the correct carb. It is a 1" updraft bendix which I think is what a new replacement would be but it doesnt seem as large as ones i've seen on other 77's. I will try to get a kit and if a good cleaning doesnt cure all that ails it probably try the jet / seat flow enhancement drilling advise. THANKS

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chuck

10-07-2004 17:02:06




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 Re: Oliver 77 RC Carb / governor problems in reply to Chuck, 10-07-2004 16:53:26  
My mistake carb is a Zenith not a bendix.



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weaver

10-07-2004 09:43:57




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 Re: Oliver 77 RC Carb / governor problems in reply to Chuck, 10-02-2004 19:30:35  
I had a very similar problem with a 770. Your problem could be multiple things. I went through the entire ignition system since it needed it anyway. Then I went through the entire fuel system since it also needed it. Neither worked to solve the running out of fuel under power problem. The tractor would run good for a while and then when you got to a hill and put it under some load it would surge and die. I could run all day at low throttle positions with out load. After studying the carburator operation I drilled out the hole where the needle opens for the float one drill bit size larger. Also down in the bottom of the bowl there is a brass piece with a hole that looks and works like a normal carberator jet. I also drilled it out one drill bit size larger. The problem was instantly fixed and I have used it for daily farm work for 6 months now with no problem at all. I am no expert and can not tell you why a factory carberator would need opened up but it worked. The main thing you have to be very careful with is to make sure you do not damage the surface where the needle contacts the brass. The needle must seal when the float rises. I took a larger drill bit and turned it by hand backwards to help smooth out any burrs. Try to issolate the problem to actual fuel starvation before you try this. I rebuilt the carberator so I had all the old pieces to play with and didn't have to worry about destroying anything. Also don't drill them while they are in the carberator or you will have other problems.

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Chuck

10-10-2004 10:19:08




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 Re: Oliver 77 RC Carb / governor problems in reply to weaver, 10-07-2004 09:43:57  
OK..I couldnt get a kit for this carb thru Napa as the numbers on the tag didnt match anything in any book. I decided to carefully take it apart and try not to ruin any gaskets. Needle and seat looked good leading me to believe it was rebuilt recently. Bowl was relativly clean but main jet had a piece of rust in it. Cleaned everything with solvent and compressed air. For good measure brought main jet up one drill size. Most gas today is diluted with alcohol (reformulated for emissions) so older type engines usually require richer jetting anyway. Put her all back together with governor hooked up. SHE RUNS AWESOME. No stalling, will idle down, governor responds nicely. A real pleasure to work with now. The main problem was probably all the crap from the old rusty gas tank. The previous owner installed a new plastic tank and petcock / sediment bowl but didnt clean the carb. I've been pulling out pine trees all day without as much as a sputter !

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RWT

10-04-2004 21:14:21




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 Re: Oliver 77 RC Carb / governor problems in reply to Chuck, 10-02-2004 19:30:35  
I am more of a hands on person but will take a stab at this.
If your ignition is not up to it, it won't matter what you do with the carb. This is based on an 1800 I worked on recently that just wasn't running right (wouldn't pull). The points were not grounding properly through the aluminum housing. That took some scraping and cleaning.

That said the carb does not sound set correctly or is somewhat dirty or blocked. At low throttle and loads you run mostly on the idle circuit. As the load increases you transition to the main jet. It sounds lean as if it is looking for more fuel from the main jet. Adjustment or further cleaning would be needed. If it were too rich you would probably see black smoke.

This could be as simple as an adjustment but I usually have to look a little deeper.

RT

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Greg Maupin

10-02-2004 19:39:21




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 Re: Oliver 77 RC Carb / governor problems in reply to Chuck, 10-02-2004 19:30:35  
I don't know a durn thing about it but I thought mebbe you could tell me if your Oliver is a 6 or 12 volt system?



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