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1940 B

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JohnK

09-20-2001 18:04:34

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Hello, i just bought a 1940 B. This is my first antique tractor. I need some advice. The tractor starts good and runs fair. I want to change the oil in the transmission and final drive. Should I flush it with kerosene first? and if so, whats the proper procedure? What weight gear oil and how much? Its holding water and I recently put in 50/50 antifreeze water. Its blowing just a hint of black smoke outta the exhaust, so I guess a carb cleaning/adjustment is in order. It runs fairly good but not as smooth as the ones i've heard at shows. All advice is appreciated as i'm really looking forward to getting this machine in better than new shape.

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Bob Weber

09-30-2001 09:34:51

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Re: 1940 B in reply to JohnK, 09-20-2001 18:04:34

I don't know if it's the proper procedure or not, but I drain the transmission (remove both plugs, one under the trans, one under final drive) replace the plugs, and pour in three or so gallons of kerosene. Then I let it soak for an hour, rock the tractor back and forth a few times to slosh the kerosene around (park it on level hard ground or concrete so this is easy to do) let it sit some more, rock it some more, etc. Drain that out and refill with 90 weight. I have only done this once, to a tractor that hadn't had the trans oil replaced for a lloooonnnggggg g time, and it had lot's of sludge laying on the bottom of the case. It cleaned it out pretty nice. I expect next time I flush it it won't be quite so nasty

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chris in WI

09-22-2001 20:58:33

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Re: 1940 B in reply to JohnK, 09-20-2001 18:04:34

Be careful!

I bought my 1946 "A" about three months ago, drove it home (13 miles) and figured I'd just give her a bath and new fluids.

Three months later, the tractor is torn down to the tiniest part, I've replaced the main case (it had been cracked a long time ago and rigged up), countless gaskest, a number of bearings, and the fan/governor assembly.

My wallet isn't just lighter, it's empty! As you dig into these old tractors, you find problems that could be left alone, and would be probably okay, but if you really want to get the tractor in "Better than New" shape like you said, it'll cost you, but it's a lot of fun.

I've sunk over $1,200 into this machine on top of the original purchase price. Considering what I originally set out to do, that's one *expensive* oil change!

Chris

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JohnK

09-22-2001 05:42:01

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Re: 1940 B in reply to JohnK, 09-20-2001 18:04:34

Thanks for the info. I plan to spend the weekend working on her.

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RICHIE E

12-22-2003 12:05:19

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Re: Re: 1940 B in reply to JohnK, 09-22-2001 05:42:01

HI JOHN K MY NAME IS RICHIE FROM ALVIN TX.I ALSO PUCHASE A 1940 B JOHN DEERE,I NEED TO CHANGE THE OIL IN THE MOTOR.THIS IS FIRST OLD TRACTOR,I HAVE A 1980.BUT I NEED HELP AND ADVISE.FROM THE LONESTAR STATE RICHIE THANK,S

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KWB

09-21-2001 18:38:15

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Re: 1940 B in reply to JohnK, 09-20-2001 18:04:34

For the transmission, in my experience a good draining will do the job unless you see a lot of crud in what comes out. Let it drain a couple of days if you can. Don't be surprised if you get some water out. 90wt GL5 gear oil is what the book calls for. If you don't plan on running it much in cold weather, you can use 140wt GL5 and maybe get the tranny to run a little quieter.

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Bob

09-21-2001 07:31:05

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Re: 1940 B in reply to JohnK, 09-20-2001 18:04:34

I would change the oil first, look at what comes out. I have seen it so thick and stringy you wonder what was in there, then a flush with (my preference) 50/50 20# sae and kerosine would be in order (it means 2 filters will be needed). If it and the filter are clean and no gunk to speak of then dont flush yet.
I can give you all the factory recommendations from home tonight, I have a original 41 operators manual for the B. Contact me direct if you want. Bob

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Bob Again

09-21-2001 18:53:03

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Re: Re: 1940 B in reply to Bob, 09-21-2001 07:31:05

So the engine is; 90+ use S.A.E. 30, 32 to 90, 20-20W, Below 32F use 10W. Below -10 use of 5W is recommended in engine and oil breather. Check engine more often. 7 1/2qts. with filter.
Transmission; 0 Far. and up- 90 7 gals. below 0f use 80W. Be sure to remove both transmission and rear axle plugs when draining.
Crankcase breather should be cleaned and soaked in engine oil for 5 minutes, then replaced.
steering gear, add transmission oil to gear housing untill oil is even with the bottom of the sector gear.
Fill each rear brake bearing oil cup to overflowing with engine oil.
Magneto; remove the plug and fill the compartment with 20W S.A.E. (engine stopped).
PowerTroll; once a year, drain, flush and fill with 30W. If cold weather use same as engine. Hope this helps, Bob

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