Posted by Bob M on December 29, 2010 at 09:36:20 from (67.240.171.41):
In Reply to: Farmall a governer posted by redblood on December 29, 2010 at 07:50:31:
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(!)
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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.
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