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Farmall a governer

R

redblood

Member
I have a belly mower on my A, I have rebuilt the governer input w new bushing and lever, new upper lever inside, new spring, new roller bearing and spacer. But can not get the rpm to the rated speed. Even with the top screw removed.
I can only get 520 rpm on my pto, at the center of it. With no load.
My rpm meter has a cone which I stick on the end of the pto. Should I be measuring on the od of the pto?
I would like to get a little more rpm to speed up the deck a bit.

Help? I have had this governer off and on the engine, probably 5 times, apart back together. The hand control is maxing out against the housing inside.
 
A couple of things I would look at.
1) Before going too far, get another tack and check engine RPM. If you have some slippage with your friction drive tach or the tach is not accurate, You could going to a lot of trouble when there is nothing wrong.
2) Make sure your governor spring is properly installed. The spring hook has to point in the specified direction.
3) Accumulative multiple points of minor ware. As a last resort, I have inserted a shim washer behind the trust bearing to compensate for multiple points of wear.

I assume being a belly mower, it is a belt drive. The easy way to increase mower RPM would be to put a slightly larger mower pulley on the PTO.

K-Mo
 
Your method to measure PTO speed (tach cone in the PTO shaft center hole) is correct. However before proceeding further I'd check with a 2nd, known accurate tach in case the calibration of your tach is wrong. Could be there's no problem whatsoever other than a bad tach reading(!)

----

Now the governor is set right the tach should show 560 - 570 RPM at full throttle/no load. (This will give full engine power when the PTO is loaded at 540 RPM.)

If you find max RPM is truly low be looking for a wrong (weak) new governor spring, new part(s) incorrectly machined, governor spring installed in wrong hole in the rockshaft (lower) arm, etc.

To speed up the engine you need to somehow INCREASE spring tension seen at the rockshaft when the hand lever is wide open. Quickest fix my be to install a suitable shim (washer) between the rockshaft fingers and the thrust bearing.

Good luck!
 
You may have a carburetor problem, not a governor problem.
With the engine shut down, remove the rod that connects the governor to the carburetor. Advance the speed control to about halfway, the governor will then call for full throttle. Adjust the length of the rod to the carburetor so that it slips on to the shaft that comes from the governor with the carburetor throttle butterfly held wide open. This is where the wide open engine speed is set.
 
Thank u for the ideas! My other 2 governers that i rebuilt worked great, this one has me stumped....
I matched the spring to the diagrams online and in my it book. Very well could b the minimal amounts of play here and there..... I will try the shim idea.
As for the pulley size. The drive pulley is only 2 inches away from the seat with no weight on the seat, i don't want to get much closer....
Carb and governer is synced to wot. I even "preloaded it a bit, just to make sure.

Thank u for the ideas. I will b working on it within the next few weeks. we shall see!!
 
520 PTO speed is not far off and will work on your mower justfine. The correct way to set carb linkage is With engine off remove the pin in the clevis goin to the carb. Now open throttle wide open. Now ADJUST CLEVIS SO PIN GOES IN HOLDING CARB OPEN. You miteneed to remove the linkage so you can get the clevis to turn easy but thats the way to set linkage. How much play does the input shaft hae on the gov housing you dont want any slop for good operation. Were the holes worn for the spring and all springs free and working. You get the linkage set and youre speed should fall in line. Still 520 is awful close.
 
I have been through the same frustration. My rebuilt A governor would not pick up the rpm under load. Finally I put a gentle dog leg bend in the throttle rod to make it slightly shorter. Boom, the gov was working. Put the bend under the tank where it will not be noticed.This may also bring your speed screw back into play.

Tim
 
(quoted from post at 18:13:50 12/29/10)Finally I put a gentle dog leg bend in the throttle rod to make it slightly shorter.
Click to expand...
If, as he says "The hand control is maxing out against the housing inside.", bending the throttle rod won't change anything except the position of the control lever.
 
Thank U, Your idea about the shim, worked perfectly!! Last night I measured 750 rpm, now to slow her down a bit.......

I did check my meter against another, same results.

Once again, thank you for sharing your knowledge with me.

Joe
 
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