Posted by M Diesel on November 10, 2009 at 11:15:28 from (12.24.61.12):
In Reply to: mw govenor posted by ScottyHOMEy on November 10, 2009 at 07:25:45:
karl f said: (quoted from post at 11:24:36 11/10/09) I have a reprinted "serviceman"s guide to H" and a "blue ribbon" for the H. One or both of those books mention the stock governor allowing 10 percent variation in rpm and an IH optional governor that allowed for 5% variation being available as extra equipment. The 5% may have been standard for a power unit version of the same engine. my % figures are off memory.
Likely the MW and other governors were about the same function as the tighter tolerance IH option, but 50 years ago they probably would have been cheaper than the genuine IH part kit. The aftermarket governors may have reduced the amount of mechanical slop in the linkage compared to a worn in IH unit as well.
$5 and an hour of your time is cheaper than $300 for the same result!
I wonder the reasons for a 10% tolerance production governor when the difference between it and better ones is so obvious to the majority of users. Not only for operator"s perception, but shouldn"t accuracy be important for running pto and belt pulley equipment? I remember a discussion between Hugh and others about diesel vs gas on a square baler and the governor speed accuracy affecting tie cycles and shear bolt breaking.
karl f
The gas start diesels had 11% for tractors and 5% for power units. One of the problems with those is that the governor will not produce full fuel (and power) at less than full RPM. The 5% models are even worse. I think the gas tractors are different in that respect but could be wrong.
On all these machines the pto speed is where the governor reaches full power under load at max throttle. Add the 11% governor offset and you get high idle.
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