Help with Governor Linkage - Tecumseh Over Revving - Snowblower Forum : Snow Blower Forums
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post #1 of 14 Old 12-17-2019, 08:01 PM Thread Starter
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Help with Governor Linkage - Tecumseh Over Revving

I'm refurbishing an Ariens ST7524E (932041) with a Tecumseh OH195SP engine. It starts fine with a new carb and runs well at idle (around 1800- 1900 RPM). However, it over revs at full throttle and I immediately shut if off when it jumped to 4400 RPM. I worked on a similar machine a couple of years ago but didn't have this issue.

I don't see any way to adjust the governor arm and there isn't an adjustment screw at the throttle linkage attached to the engine shroud...at least not that I can see. At first I thought I could adjust the arm with screw at the bottom but it appears that's just how the arm is attached to the oblong engine governor shaft.

There really isn't much throttle travel on this model....it's more like off / idle / and full throttle. The yellow snot in the 4th photo is Fluid Film I used to lubricate the throttle mechanism. Looking at the parts diagram I see there's a spring (#19A) but I'm not finding it on my unit...not sure it's intended for the governor linkage though. Any suggestions would be appreciated.
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post #2 of 14 Old 12-17-2019, 08:52 PM Thread Starter
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Well, now that I expand the first and second photos, I'm thinking the governor arm can indeed be adjusted at the shaft near the screw. The end of the engine governor shaft is oblong (maybe to hold while you move the arm?) but the shaft itself appears to be round....hmmm....
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post #3 of 14 Old 12-17-2019, 09:09 PM
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DO NOT adjust the governor arm at the shaft near the screw.
Note the spring that goes from the governor arm to the tab that hangs down from the throttle control, the spring wire goes through the hole in the tab and then forms a U. The tab that hangs down is the high speed adjustment, bend the tab to adjust the maximum speed.

1986 Toro 524 (Predator 212 Hemi, Impeller Mod.)
1997 Toro 724
1997 Toro 824XL Power Throw
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post #4 of 14 Old 12-17-2019, 09:41 PM Thread Starter
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Quote:
Originally Posted by toromike View Post
DO NOT adjust the governor arm at the shaft near the screw.
Note the spring that goes from the governor arm to the tab that hangs down from the throttle control, the spring wire goes through the hole in the tab and then forms a U. The tab that hangs down is the high speed adjustment, bend the tab to adjust the maximum speed.
Excellent - the tab at the RED arrow, correct?
Thanks Toromike!
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post #5 of 14 Old 12-17-2019, 09:56 PM
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Correct, the red arrow tab is the governed high speed adjustment. I think this engine has a governed idle speed as well, the green arrow tab would be the governed idle speed adjustment.

FYI, do not move the governor arm at the shaft near the screw unless you are disassembling the governor, or resetting the governor adjustment. There is a specific procedure to reset the governor arm, but it rarely needs to be done, mostly when someone has messed with it.

1986 Toro 524 (Predator 212 Hemi, Impeller Mod.)
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1997 Toro 824XL Power Throw
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post #6 of 14 Old 12-17-2019, 10:21 PM Thread Starter
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Quote:
Originally Posted by toromike View Post
There is a specific procedure to reset the governor arm, but it rarely needs to be done, mostly when someone has messed with it.
As it turns out, someone messed with it (me) before reading your first post. Dang it!! Is there a source document I can reference instead of continuing to pester you?
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post #7 of 14 Old 12-17-2019, 10:49 PM
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Quote:
Originally Posted by rod330 View Post
As it turns out, someone messed with it (me) before reading your first post. Dang it!!
Don't worry about it, we've all done it at one time or another.

All these governors work on the same principle. These videos explain how to do it, they may not be exactly like your machine but the principle is the same. If you need more I can come up with something else.





1986 Toro 524 (Predator 212 Hemi, Impeller Mod.)
1997 Toro 724
1997 Toro 824XL Power Throw
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post #8 of 14 Old 12-18-2019, 12:17 PM
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rod330, here are some Tecumseh manuals that will give you further information on governors. They also contain lots of other information.

see page 26 figure 14 for a diagram of your throttle speed control
see page 25 at the bottom for how to set idle and high speeds
http://www.barrettsmallengine.com/ma...alvemanual.pdf

see page 27 for how to reset the governor arm,
I think the videos explain it better
http://www.barrettsmallengine.com/ma...headmanual.pdf

Also, lots of other tecumseh manuals are available here
Tecumseh Service Manuals

Good luck

1986 Toro 524 (Predator 212 Hemi, Impeller Mod.)
1997 Toro 724
1997 Toro 824XL Power Throw
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post #9 of 14 Old 12-18-2019, 09:06 PM Thread Starter
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Thanks again, Toromike.
Yes, the 2nd Teryl video is especially good and I hadn't seen that one.
Those tech manuals are quite good; I glanced at two of them before posting but wasn't as diligent as you at sifting through the many varieties. I'll be more patient next time

Anyway, I'm going to take a crack at it Friday, weather permitting. It should be easy to get full throttle RPM to 3600 bending the tab.
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post #10 of 14 Old 12-18-2019, 09:55 PM
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Garage
just wondering if throttle plate moves freely? had this problem on several Honda hs724's and the throttle plate was stuck open. a little oil and they worked fine and had no more problems.

however in these cases it over revved from the beginning.

"It Feels Like Beer O'Clock "
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