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When you were told “pinion gear” were you told which one? There is a pinion shaft that drives the ring gear on the differential, there are also two pinion shafts that dive the “bull gears” or final drive. The one that you are referring to is the one that drives the “bull gear” on the right side. The PTO hole that Aces is referring to is where the PTO unit is bolted into the rear end of the tractor. After the PTO is removed, you can see and reach into the rear end of the tractor at least somewhat. The casting you are working on needs to have the bull gear removed from the axle and moved rearward enough to clear the part of the housing with the inside bearing for that pinion shaft. My suggestion is to go ahead and pull the cover off the transmission/differential. It will take more time, but he work will be less frustrating since you will be working from the top rather than through a small opening. Get a shop manual to help out, and by the way, this will not be a quick deal. That way you can inspect gears, bearings, and replace any defective parts found. Now, before you get really gun-ho, take the cover off the top of the mid section (TA) of the tractor and check the small clutch under the cover. If this clutch is shot and the TA ramp and roller clutch has failed the tractor will not move. The clutch under the cover drives the whole tractor (through the TA planetary carrier) and if it is out, then power is transmitted through the planetary gearing. If the ramp and roller (overrunning) clutch has also failed, the planetary carrier will spin backwards and the tractor will not move. Hope this helps.
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