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Minneapolis Moline Tractors Discussion Forum
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Z transmission case flush

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Brian(MN)

04-20-2004 16:50:07




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Hi, I am working on my 1939 Z. I want to drain the rear end and put in new oil. The oil in there must be 140WT and very old, with a lot of water as the level is above the check plug. Any advice on how to get that old stuff out of there? Does everybody use 80-90wt now? The books for these old tractors say use 140, and that was still available a few years ago. That stuff is as thick as molasses in January.
Brian (MN)

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Brian(MN)

04-25-2004 08:13:37




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 Re: Z transmission case flush in reply to Brian(MN), 04-20-2004 16:50:07  
Hi, Thanks to everybody who replyed to my question. I am going to have to put this project on the back burner for a while-it is planting time. I had the tranmission cover off to replace it-the shift level was wore so. I replaced the entire top with one from a parts tractor.
Brian(MN)



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Ryan

04-21-2004 18:43:23




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 Re: Z transmission case flush in reply to Brian(MN), 04-20-2004 16:50:07  
I had an mta that the oil would not even drain out. I ended up taking the top cover off and the pto cover and scooping it out by hand. I then used gas in a hand sprayer to get it cleaned out. On a G once I drained the oil out for a couple of days and then put 5 gallons of diesel in the tranny and drove it a bit then drained it. I repeated this a time or two and then refilled with lighter oil (85w). If you are not plowing with it or using it all day then you can probably get by with lighter oil.

Ryan

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Mopower

04-21-2004 04:57:30




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 Re: Z transmission case flush in reply to Brian(MN), 04-20-2004 16:50:07  
Hey Brian,

Wait for a hot day, drive it around, and let the old girl drain for a couple days. To clean it out, I recomend mixing half 80w-90 and ATF (automatic tranny fluid). The detergent in the ATF is great for cleaning things out. Use it for light work for around the place and drive it on a nice hot day and drain it again. Then add you new 85w-140. I've done this. My R looked like chocolate brownie covering the inside of the tranny before I cleaned it. New 85w-140 is thinner than the old brown "glue". TSC has it reasonably priced.

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Kelvin

04-20-2004 18:39:28




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 Re: Z transmission case flush in reply to Brian(MN), 04-20-2004 16:50:07  
The fuel oil company here locally in NC can get 95-140 multi-weight or some such. I'd bet if you check around you can still find straight 140wt.

Your tractor is a '38. I would probably not change it to a lighter weight. metallurgy in the bearings and gears improved consierably from the 30's to the 50's, (even though part numbers on bearings and gears probably didn't change) so probably its best to put back 140 if you can get it. if you want to "pull" and aren't planning to work it, then maybe 90wt.

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Kelvin

04-20-2004 18:40:39




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 Re: Re: Z transmission case flush in reply to Kelvin, 04-20-2004 18:39:28  
whoops! I see its a '39.



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BLT

04-20-2004 18:22:44




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 Re: Z transmission case flush in reply to Brian(MN), 04-20-2004 16:50:07  
Brian,
On my tractors, I take the transmission cover off and use a blow gun with diesel to clean it out. On my UTU it took 15 gals. of diesel, the oil probably had never been changed, it was as thick as gun grease. In your climate you may want to use a thinner oil, but you may have more leaks around the axle and brake gaskets.



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Russ

04-21-2004 14:58:37




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 Re: Re: Z transmission case flush in reply to BLT, 04-20-2004 18:22:44  
Tranny oil; Use the 140 if your only a fair weather farmer. If you plan to use it some during the cold winter months use the lighter weight lubricant.



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