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Discussion Forum

Governor on a '41 B

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Scott Murphy

08-08-2000 14:59:34

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I'm wondering if something is missing. When I removed the gov. housing, all I had inside were the gear, shaft, weights and (for lack of the proper term) a thrust bearing and small "fork" which is welded to the throttle arm. (the one across the front of the motor) The only spring in the system attaches the gov. arm to the throttle arm outside of the housing. Are there any springs that are supposed to be on the inside of this housing?

My problem is this, when mowing or even going up a hill in 2nd or 3rd, the governor doesn't advance the throttle. It just idles down and eventually dies. Any ideas?

Perhaps related, but I can barely pull my 5' BMB rotary through mild fescue/prairie/assorted small weeds, etc. (To put it in perspective, I had been able to mow it with my old 12hp Massey lawn mower.) Should an old B be able to handle a 5' brush hog or is this too much mower for the tractor?

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Dick L

08-08-2000 15:36:55

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 Re: Governor on a '41 B in reply to Scott Murphy, 08-08-2000 14:59:34  

That is it, there aint no more. For the power part I have questions. Do you have a way to check the rpm's? Do you have an increase of rpm's one notch at a time as you move the gas lever forward? How tall is the grass? Are you mowing at full throttle?

A govenor does not advance the throttle, it restricts the throttle. The rpm's forces the weights out which pushes the thrust bearing against the fork which in turn closes the butterfly inside the carb. The external spring tension applied by pushing the gas lever forward will increase the rpm's. As the engine rpm's slow down from load the force is reduced on the govener weights and allows the carb. butterfly to open, but only to what the tension is on the external spring.

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Scott Murphy

08-08-2000 16:58:45

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 Re: Re: Governor on a '41 B in reply to Dick L, 08-08-2000 15:36:55  
Grass is about 8 inches. I'm cutting it to about 4.5 inches. The only way for me to check RPM is to throw the old dwell meter on it (it has an RPM setting.)

It seems that all the increase in RPM is from notch 2 to about notch 5 or so. After a point, I get no more increase in RPM. BTW, The gov. is...uhhh... disabled at this point and I'm mowing at full throttle.

How long should that external spring be at rest? Any idea of the poundage?

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Dick L

08-08-2000 19:17:30

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 Re: Re: Re: Governor on a '41 B in reply to Scott Murphy, 08-08-2000 16:58:45  

The tractor should do what your asking it to with out a problem. How ever if your B still has the 3 1/4" pistons it is factory rated at 18.8 HP at the PTO and 12.6 HP at the drawbar. If it has the 3 3/8" pistons it would have a 21.17 HP rating at the pto and 15.6 at the drawbar. The newer B's had the 3 3/8" pistons ( per I&T manual) and were rated the same as the C with 1850 RPM's for both. The CA has the exact same engine only set at 2000 RPM's with a factory rating of 22.69 at the pto and 17.8 at the drawbar.

As for a spring test for tension, I know of none. The setting is made by bending the cross arm to get the correct RPM's DO NOT try bending the cross arm while the engine is running. The fan will bite. At rest with the engine off the spring will not have tension on it. The B's had a stiff spring that is kind of hard to unhook, the C's and CA's had a dowel in the center to keep them hooked.

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Scott Murphy

08-14-2000 10:17:14

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 Re: Re: Re: Re: Governor on a '41 B in reply to Dick L, 08-08-2000 19:17:30  
I think I've got it figured out finally. The gov. was fine. I had two bent pushrods due to stuck exhaust valves. (That's also why I had compression in those cylinders.) The gov. was working just fine, the tractor was just running on two cylinders. It runs much better now!

Thanks for the help though!

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