1952 super m

steve1243 · Feb 25, 2014

I have a 52 super m that grinds in 3rd and 4th gear. The grinding is intermitant but there a constant vibration....shakes the the steering column back and forth about 1 and a half inches. There's no noise or vibration in 1st or 2nd, 5th its very minor. The rear tires are loaded.
Any ideas of where to look would be apreciated.

steve1243 · Feb 25, 2014

I've talked to a few different people and have been told a whole bunch of different things. Wheel bearings, clutch adjusted too tight causing it to put pressure on throwout bearing, gear oil too thin, and break it down and rebuild the tranny. Hoping its something simple.

D Slater · Feb 25, 2014

Don't know, could be anything from loose wheels to bad bearings or gears. Since third and forth puts more pressure on the main shaft pilot bearing than gears more to the rear. If nothing external is found maybe check the input shaft coupling and remove the belt pulley gear box and look in the hole. Shake the shafts looking for bad bearings. Also look for metal and broken pieces. Could also be a differential or differential bearing going bad or a bull gear dragging the housing or a bull pinion bearing. Would start checking at the outside and then front driveline back first. Unless you can see a rear wheel vibrate more than usual when starting out, like a bad axle bearing.

steve1243 · Feb 25, 2014

So a good place to start would be draining the gear oil out of the rear and looking for more than normal shavings, pieces of gear,etc. The one thing i did notice was in the inspection hole on the bell housing the alot gunk like burned gear oil grease etc and theres only about 1/4'' of free play in the clutch pedal. I was thinking spraying it out with 2+2 or brake clean to clean it up. Maybe find out where gear oil is coming from. If it is something internal is the tractor worth fixing just to be a daily worker or should i look for another tractor and put the sm aside as a free time restoration project.

mkirsch · Feb 26, 2014

The clutch pedal should have something like 3/4" or 1" or 1-3/8" of free pedal travel. I can never remember which it is for which tractor. That's adjusted by that turnbuckle-looking thing on the pushrod between the clutch pedal and the throwout arm.

If you're out of adjustment, the clutch is shot anyway and needs to be replaced.

Frankly, if it's shaking that badly, and grinding, the simple cheap fixes aren't going to help you. You need to take the deck off the tractor and look down in there to find the problem.

John M · Feb 26, 2014

Theyll grind a little, never saw one that didnt. 3
and 4 done share anything but the shaft they ride
on, so possibly the shaft is wore there. I think
Iwold start with the front end and go from there.
maybe a tire is out of whack. Is it a constant
shake or does the speed of the shake change with
the gear selection?

steve1243 · Feb 26, 2014

The shake stays constant for the most part, but grinding varies in pitch similar to a bad wheelbearing in the front of a car....gets real loud and about fades to nothing loud again and so on. Whatever grinding is turning. Is it possible the grinding and the vibration are not related?

John M · Feb 26, 2014

I would have to agree with Mr Slater. Wore bearing.

1952 super m

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