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420W Brakes
:

Wet or Dry?

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Andy Bradley

01-28-2002 04:29:18




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I have a 1956 420W that needs new brakes. I removed the brake housings and found some fluid which looks to be gear lube from the transmission. Someone once told me that these tractors have a wet brake system. Is this true and if so, do I need to add some gear lube when I replace the the old discs? They are pretty saturated after 45 years...




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Steamer

01-28-2002 14:20:33




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 Re: 420W Brakes - Wet or Dry? in reply to Andy Bradley, 01-28-2002 04:29:18  
Hi,

They're supposed to be dry, but as BMeyer points out they do have a tendency to self-convert to a wet system over the years. I just went through this a year ago, and it's really not all that bad to correct.

The discs were still available from the local JD dealer, although I had to help him out with figuring the correct part number. He'd never looked up parts for one of these before, and he was certain that the 430 was a garden tractor.....

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BMeyer

01-28-2002 13:05:57




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 Re: 420W Brakes - Wet or Dry? in reply to Andy Bradley, 01-28-2002 04:29:18  
The 420W has a dry brake system. If you have oil on the disc pads, the seal needs to be replaced on the quill which holds the bearing and bearing cup for the differential. The shaft from the final drive, which the brake disc fit on, goes through this quill and the oil is coming from the differential. To replace these seals, the final drive(s) will have to be taken off to get to these seals.

Be very very careful when replacing the final drives. That shaft will have to be lined up properly when going back into the quill or you'll damage the seal and your work will be in vain.

Hope this helps. If you need more info please feel free to contact me.

BMeyer

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Dan s.

01-28-2002 11:11:37




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 Re: 420W Brakes - Wet or Dry? in reply to Andy Bradley, 01-28-2002 04:29:18  
i believe that the 420 was a dry brake system. There should be a hole on the bottom of the casting that goes over the brakes where the oil should drip out of. Normally this hole gets plugged, and results in the brakes getting saturated in oil, and thus not working properly. If I am wrong someone else should be able to correct me. Good Luck



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