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Tractor Talk Discussion Forum

1957 john deere 420 fluid type

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04-04-2016 19:41:25

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i just purchased a john deere 420 i wondered what fluids it took as far as transmission/ differential. I have ordered a service manual for it but wondered if anyone has used anything in particular they have had good luck with. tractor will need some work but i want to start here and get all the fluids changed. thanks!

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04-05-2016 11:21:16

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 Re: 1957 john deere 420 fluid type in reply to tgordon12, 04-04-2016 19:41:25  
thank you sir. im a little slow what is the TOM unit? i was under the impression it was all one big cavity transmission, rear end, hydraulics. i have never had a 420 apart, i rebuilt the transmission on an old B i had. I also have a 720 gas but never had that apart either..
thanks for the info!

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04-05-2016 21:35:14

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 Re: 1957 john deere 420 fluid type in reply to tgordon12, 04-05-2016 11:21:16  
Touch O Matic. It's just a Deere term for the hydraulic system. The lift assembly bolts to the top. There's a drain plug in the rear under the seat and a petcock up above it to let you know when it's full. Each final drive has it's own drain plug and fill hole as well as the tranny.

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04-05-2016 06:47:00

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 Re: 1957 john deere 420 fluid type in reply to tgordon12, 04-04-2016 19:41:25  
GL 1 140wt. 60wt motor oil would be better if you can find it in your area. Steering box uses the same oil. Use 20wt or 30wt Non Detergent oil in the TOM.

If I'm not mistaken when you get the manual you will find Deere recommended 85/90 wt GL 1 in the tranny and finals when they were new. 140wt in the steering box and 10wt Non Detergent in the TOM. It's been a long time since it was new.

DO NOT FLUSH unless you are planning on completely rebuilding! You will open Pandora's box.

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