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RPM drop

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burns

09-16-2002 17:22:31

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A friend of mine called the other night with a problem with his poked and stroked G. Without a load he has set his high rpm at 1300. Within 25 feet from the start of the pull it drops to around 1000.

new G governor weights direct from Deere
governor has been rebuilt
double spring
indexing pins on throttle linkage is not slipping
bushing on carb throttle shaft is new
clutch is good
distributor has been recalibrated by Motec
if you take the throttle stop out and advance the throttle, it will pick back up

Certainly there isn't enough of a load on the tractor at the 25' mark to drop the rpm plus he is able to maintain the rpm clear out to the end of the pull. It just seems to me that the governor is doing something that will allow the tractor to rev a little higher without a load but drop within operating range with a little load.

Any ideas?????
Thanks

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ToddF

09-18-2002 12:58:51

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Re: RPM drop in reply to burns, 09-16-2002 17:22:31

I have a 70gas that exhibited pretty much the same problem after a poke and stroke and a carburetor rebuild. A light or gradual load would drag the rpm's down some, but grab the throttle lever and she would respond. Somebody on the JD board gave me good advice. Turns out the new throttle shaft bushing was dragging just a whisker on the throttle shaft. Luckily I saved the old one and swapped it for the new one, problem solved. I suppose you could ream the new bushing somehow if that is the problem and the old one is no longer available. The gentleman that gave me the advice claims that the new bushings occasionally are a little tight, and cause this problem when they are.

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burns

09-19-2002 12:13:58

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Re: Re: RPM drop in reply to ToddF, 09-18-2002 12:58:51

Thanks Todd. I'll pass on the info!

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Gman

09-17-2002 18:01:45

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Re: RPM drop in reply to burns, 09-16-2002 17:22:31

Hello Fred glad you got back on the board. On my '51 "G" I put in a set of B gov. weights stopped the fight with the springs,makes it a little more responsive at full throttle,only other difference I've found with the B weights it will hunt a little loafing along. A witchata Jerry's engine is giving me fits, the only difference I can come up with is the Funderburke pistons are very heavey and are swelling dragging the horse power down,what is your opinion on the piston weight theory I'm considering a Jerry's setup. I hate to tear it down it is a sweet running engine and sound just as sweet,but the H.P. isn't there. Later Garland

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burns

09-19-2002 12:12:16

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Re: Re: RPM drop in reply to Gman, 09-17-2002 18:01:45

Well I've had some rather interesting discussions on this board regarding reciprocating weight having potential/kinetic energy. Do you know how much clearance you have with the current pistons? Some folks go as much as .003 per inch of bore. A buddy pulls an A with just a hint of piston slap on the initial cold startup. Typically .011-.013 is standard clearance on aluminum pistons. What is the piston weight of Funderburk's piston. Last I heard some guy was trying to make Funderburk's business go. I think it was a son in law. I know they have ticked a few local guys off.

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Brad

09-17-2002 12:40:30

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Re: RPM drop in reply to burns, 09-16-2002 17:22:31

How is the fuel mixture?

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burns

09-19-2002 11:10:22

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Re: Re: RPM drop in reply to Brad, 09-17-2002 12:40:30

He says it has a slight smoke while under load. He is pushing close to 100hp.

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09-16-2002 20:21:53

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Re: RPM drop in reply to burns, 09-16-2002 17:22:31

Hi Burns! Has he tried a different governor spring? My 49 A was acting a little like that. Switched out the spring and it was like climbing on a different tractor. Just a thought! Don

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burns

09-19-2002 11:07:12

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Re: Re: RPM drop in reply to DP , 09-16-2002 20:21:53

Yeah he has changed the springs and actually have doubled them up.

Thanks

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lynn

09-16-2002 17:44:15

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Re: RPM drop in reply to burns, 09-16-2002 17:22:31

burns..one thing you might try is to set the throttle rod into the carburetor where it lines up with the hole instead of having it one half of a hole short..even with new weights and pins there seems to still be enough slack where the governor won't reduce the speed enough at high idle..it just can't push the rod far enough forward and feels like a lot of rpm till you put a load on it..then the spring tension is not enough..i do all of the ones i work on this way..lynn

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burns

09-16-2002 18:22:03

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Re: Re: RPM drop in reply to lynn, 09-16-2002 17:44:15

I'll pass the info on but I think he has already experimented with the throttle linkage. BTW, you seem to know your way around a Deere. Are you a builder, puller, both? Drop me a line some time you get the chance.

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johndeereyellow

09-16-2002 20:57:32

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Re: Re: Re: RPM drop in reply to burns, 09-16-2002 18:22:03

Burns::::::::::::::::::::>>>>>>>>>>>>>>>>>>>>> Thumper did the same thing till I put on a dubble spring and that stopped that. If I need to run stock RPM"S I just move the rod from the lever in back spring and hooked in front spring will give me easy 20% over RPM"S. Rod

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