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Discussion Starter · #1 ·
Oh yes, yet another VH70 governor thread. I think this isn't normal, but before I open up the engine I wanted to check with the group. The governor arm on my '74 70 stops at 12:00 when turning it counter-clockwise, but will fall freely in a clockwise direction from 12:00 down to 6:00. I think I remember it having some resistance that would prevent it from doing that last fall when I had it running, but I have the tractor torn down now for repainting and would hate to get it all back together only to find the governor doesn't work right now. So, can anybody confirm that is normal/not-normal for the governor arm to do that?

Thanks,
Dave
 

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Discussion Starter · #2 ·
I've tried to do some more homework on this one, and hope that someone might be able to chime in if I am on the right track. First, I think using the word "spring" in my post title is wrong, and maybe I should have said "clip". I found some manuals for the Tecumseh engines online, and it looks like maybe it is functioning OK?. To clarify, I have the carb and all the linkages & spring between the governor arm and carb removed. Just the governor arm hanging out there by itself. From the manuals, it looks like maybe the external spring is all there is to keep the governor arm in contact with the governor spool inside the engine. Since I have that off, the arm can lift off the spool (turn clockwise), but can't turn counter-clockwise past 12:00 because it then touches the top of the spool. I did try to open up the engine to look inside, but couldn't get the top part of the PTO clutch off the crankshaft to get the oil pan off. I did get it to open up about 1/8", which then allowed the governor to move CCW to 11:00 which I think is because the spool moved down with the oil pan.

So my remaining question I'm hoping someone can help with is if there is supposed to be something internal like a clip keeping the governor rod in contact with, or at least closer to, the top of the spool? Based on the illustration, I assumed the governor rod was fixed to the governor arm, and if I spun it CW much past 4:00 or so the rod should hit the inside of the block. That doesn't appear to be the case, at least on my engine, because that arm will spin CW all the way around to 8:00 or so. As a sanity check I compared to a couple other Tecumseh engines I have. On the 3.5HP on my tiller it seemed like the arm might spin around like this one (except the arm run into an engine mounting flange). On a 12HP out of a junk Murray it would only move between 12:00 and 2:00. Anybody out there with a 60/70 willing to disconnect the governor link and spring from their governor arm and see what their range of motion is?

Thanks,
Dave

 

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Dave, I have a few VH60 & VH70 blocks on hand and on all of them the range of governor rod rotation is basically the same as what you are reporting. Not 100% sure on lower clockwise limit as the governor arm strikes the side of the block/flange before reaching its limit. According to the illustrated parts breakdown and the JD Service Manual illustrations there are no internal components that force the governor rod to maintain contact with the spool, rather I believe that is accomplished by the external governor link & spring.
 

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Discussion Starter · #4 ·
Thanks Bob. That is what I was hoping. I really was wanting to get the tractor put back together and was not looking forward to taking the engine apart if there was something wrong with the governor.

Dave
 

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I took my carb of the tractor and rebuilt it. I'm having difficulty remembering how to hook the linkages, spring and that cover plate back on. Does anyone have a picture of a completed carb linkage set up ? I can't believe I didn't take one myself before I took it apart
 
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