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38 Model A Governor

S

s12384j

New User
So I've finally got around to working on my 38 A that I got from my grandparents (was there first tractor on the farm) it has basically been sitting for around 30 plus years, and got it running last weekend. Once it started up I knew there was something wrong with the governor as it just wants to race away, well I got in to it today and found the left cover bearing toast, also the fan gear just about to round off, and the weights were hitting the case. My question being is there really only the one left side cover bearing or did the right side one disappear? I notice the shaft was rubbing on the case a little but not too too bad, but what controls the right side shaft play? I didn't see any oil getting up on the right side, directly behind the magneto, just some metal shavings and whatnot. Lastly what size is the bushing for the fork shaft (the one pressed into the too of the governor housing)? Thanks, Tony
 
Tony There is no bearing on the right side of your governor. the mag drive fits inside a machined surface with close clearance. If you look inside oil pressure guage hole there is a very small hole in back (looking thru threaded hole) of governor. Look closely. it is there, more than likely plugged up. This hole allows oil to be sprayed on governor shaft which in turn oils right side of governor. I"m guessing that your left hand bearing problem is causing your fan gear and metal shaving problems. As for the bushing size i"m not sure, but most machine shops could determine that if you can"t come up with that info from a parts man. or someone on here. Good Luck
 
(quoted from post at 18:16:48 08/16/14) Tony There is no bearing on the right side of your governor. the mag drive fits inside a machined surface with close clearance. If you look inside oil pressure guage hole there is a very small hole in back (looking thru threaded hole) of governor. Look closely. it is there, more than likely plugged up. This hole allows oil to be sprayed on governor shaft which in turn oils right side of governor. I"m guessing that your left hand bearing problem is causing your fan gear and metal shaving problems. As for the bushing size i"m not sure, but most machinepositive that the bearing ld dine that if you can"t come up with that info from a parts man. or someone on here. Good Luck
Click to expand...
I'm pretty positive that the bearing went out first as the fan shaft bearing seems to be fine. I'll have to take a peek at the oil passage once but I'm pretty sure the governor case took some wear, I just pulled the governor out through the left bearing cover, I will obviously have to remove the case with what I found, but would a machine shop be able to repair what has ground away on the mag coupler side or should I be trying to source out a better used case? Also I know the weight pins and whatnot should be tight, but does it make a difference that some of the weights were ground away while they were hitting the case, as far as function goes?
 
According to the parts book the same 3-piece bearing set is used on both the right and left ends of the governor shaft.

JD 7655R Cup
JD 7657R Balls and retainer
JD 7656R Cone
 
3 bearings on the governor shaft. 1 thrust bearing & a bearing on each end of the shaft. The shaft & bearings are spring loaded and the fan shaft gears are shimmed on the fan shaft & on the flywheel side of the governor (left)to get the proper mesh. It sounds like you may need to repair the mag side of the gov. housing. You need to get a parts breakdown & a manual.
 
(quoted from post at 19:52:35 08/16/14) 3 bearings on the governor shaft. 1 thrust bearing & a bearing on each end of the shaft. The shaft & bearings are spring loaded and the fan shaft gears are shimmed on the fan shaft & on the flywheel side of the governor (left)to get the proper mesh. It sounds like you may need to repair the mag side of the gov. housing. You need to get a parts breakdown & a manual.
Click to expand...
I took a look at it a bit more, I do see the right hand bearing, because of how pitted and stuck it is I didn't realize it was a bearing somehow. I do have this crap I&t manual but doesn't say a whole lot. I'm trying to access the jdparts catalog but i only have my phone for internet right this second, I do believe that I have it figured out now, now just to source parts. I've been searching online and can't find the fan gears, do you know of any place new or used to find them at?
 
The part numbers I gave early are no longer available from John Deere.
New Departure# 909001 is a 1-piece replacement for those numbers. Most good parts houses like NAPA should get it for you.
 
Might just want to look for another setup . I have
found better ones than what I've had to work with
 
As Kent says, There is a bearing on the right side. It was common for the Gov. housing to wear there and a service bulletin told how to bore and repair the worn housing.
 
(quoted from post at 07:18:33 08/17/14)
Gov bearing are the same as 55,56 etc. Chevrolet outer front wheel bearings.
Click to expand...
Thanks for the alternative part numbers. I did manage to get somewhere with it today, however I haven't been able to get the right side bearing off the shaft, I have the rest of the shaft apart however. I need to make a clam type wedge to be able to press it off. Does the spring and bearing come off the left side of the shaft like everything else did or does it come off the mag side?
 
cant imagine these guys working on a governor if they can't even determine how many bearings are needed to rebuild it
 
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