Emulsion again in transmission

While getting one of my 1850’s ready to drive to the tire shop I went to check fluids and found the transmission gear case full of emulsion again. I had flushed and drained the gear case a couple of times before haying and replaced all the fluid. It was still good early in September the last time I pulled the level plug but I was sad to see how emulsified the gear oil is now. As I replaced the transmission shifter boot in the summer I am left to conclude that the gasket at the top of the gear case is bad and rain and snow melt have trickled in to gear oil. Cant see anywhere else it can get in. I was thinking instead of ordering and waiting 10 days for a new gasket kit to come in I would use a tube of the gear case caulking I used on my trucks rear differential last summer. It’s not cheap at $40 bucks for a small tube but might be a better product. My only concern is what will this do to meshing of the hydraulic pump drive gear. Is the stock gear case garlock gasket important to the clearance on the hydraulic pump drive gear?
 
Obtaining proper backlash from pump gear to drive gear is important. Too little clearance can break gears and castings as metal expands as it warms up. I bought a Ford 860 many years ago that had the camshaft break as the pump driven off of it could not turn once warm. I would wait for the correct gasket before doing any work but maybe somebody here knows different. I take it that the tractor has to sit outside?
 
Black lash, that’s the word I was looking for. Thanks for the advice. Yes, it is an outside tractor and travels to fields 30 miles away so it will get rained, hailed and snowed on. I got the rear tire repaired today and have left the tractor in a shop in town. The tube was natural rubber and cost $200 but I will save that rant for another post.

I will take the cover off tomorrow and see if I can’t find the entry point for the water. Also bought two pails of Walmart gear oil (on sale this week). I looked for garlock sheets in the city this afternoon but no one sells it in a big enough piece. I have made gaskets out of a hardwood flooring underlay that is nice to work. Almost every vehicle on the farm has a thermostat gasket made from it but I fear it will be too thick for this application. More standoff would be a bit less of a risk. I will try to get a thickness off whatever I am able to recover from the top of the gear case and go from there. My $400 tire repair has eaten up the maintenance budget for Q1. LOL
 
Check where the wires for the neutral starting switch inter under the transmission cover. There should be a rubber insert in the notch to seal the opening. It was missing on my 1550 and the switch was gone so no wires. I made a plug from some sheet rubber.
 
(quoted from post at 19:21:49 01/05/21) Black lash, that s the word I was looking for. Thanks for the advice. Yes, it is an outside tractor and travels to fields 30 miles away so it will get rained, hailed and snowed on. I got the rear tire repaired today and have left the tractor in a shop in town. The tube was natural rubber and cost $200 but I will save that rant for another post.

I will take the cover off tomorrow and see if I can t find the entry point for the water. Also bought two pails of Walmart gear oil (on sale this week). I looked for garlock sheets in the city this afternoon but no one sells it in a big enough piece. I have made gaskets out of a hardwood flooring underlay that is nice to work. Almost every vehicle on the farm has a thermostat gasket made from it but I fear it will be too thick for this application. More standoff would be a bit less of a risk. I will try to get a thickness off whatever I am able to recover from the top of the gear case and go from there. My $400 tire repair has eaten up the maintenance budget for Q1. LOL

I didn't know you could even buy natural rubber any more.
 
I don't know if it's natural. I found it in an Amish surplus place near me. Black, half inch thick, about 12x30 inches, for $3. I made a vibration damper for my 1207 ($140 from Deere) and just whittled a plug for the Oliver.
 
There are no wires or spots for them to go through on the hydraulic section of the gear case cover but I did see what appears to be a small gap on the front of the transmission shifter plate on the forward section of the transmission case. That must be where the wires would go if it had a neutral sensor. I will take that off tomorrow and have a look at it. I took the the larger top section off today and the gasket is there but shows signs of having been reused several times. AGCO had a gasket set in stock and they were about the same price as using the high end gasket stuff in a tube so gaskets it will be. Also found that several of the bolts came loose after 2 or 3 rotations so they might have been a bit short for the job. Good news is the bull gears look great after 50 years so no apparent damage to them from the emulsified oil. Will see the bottom of the case tomorrow hope there is no surprises. The plugs had a bit of metal on the magnets.
 

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