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Author Topic: Belarus 420 Trasmission Filling with Water  (Read 1546 times)

Munro5299

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Re: Belarus 420 Trasmission Filling with Water
« Reply #3 on: June 12, 2018, 09:18:47 PM »
Thanks for the Info, I have a few things to check and It looks like its going to be an (All of the Above repair), I appreciate you taking the time to respond



  • 1981 Belarus 420 (T40) w/Leon 636 Loader

Brought Upright

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Re: Belarus 420 Trasmission Filling with Water
« Reply #2 on: June 11, 2018, 01:11:16 AM »
Yes the white plastic fill/breather plug with hole is OEM & needed to vent heated (expanded) tranny air. If there is no breather the resulting pressure increase will force the lube to escape elsewhere. It also helps remove condensation.

Remove the white plastic tranny fill/breather plug and check it's packing. If the packing is missing then both water & dirt can easily get in. Another possible entry point for contaminants is a torn shifter boot. I bought a replacement from ebay seller harp2rs which didn't last long so I went Swamp Yankee Redneck on it & unscrewed the shifter knob, slid a cut-in-half plastic soda bottle over it & sealed the top w/duct tape. Looks perfect next to the vertical Vise Grip on the Mode Shift Lever  :o

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F183242624679

Also, remove your engine air cooling shrouds & blow out any mouse nests etc, the engine needs to breathe too
« Last Edit: June 11, 2018, 01:52:35 AM by Brought Upright »
  • Belarus 420A

Munro5299

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Belarus 420 Trasmission Filling with Water
« Reply #1 on: June 10, 2018, 11:04:51 AM »
I have a 1981 Belarus 420, FWA with a Leon 636 Loader. The tractor always seems to take on water in the transmission, I acquired the tractor from my grandfather recently and he alerted me to this problem as the tractor had sat for a couple years, but since owning the tractor, and purchasing it from the original owner in the late 80's he claimed that this always happened possibly due to melting snow and rain being caught by the white (plastic looking fill plug that appears to have a vent or breather hole in the plug itself. Located  on the floor of the tractor( lack of better term) If anyone can send me a picture of a correct plug for the tractor as I know many things were done over the years prior to my grandfather owning it, and most those are certainly not OEM suggested repairs, so a guy grabbing the first plug he found if it were to have a hole or not, wouldn't surprise me. Is this plug supposed to have a breather hole in it? Or does it even need one?




Thanks for your time.
  • 1981 Belarus 420 (T40) w/Leon 636 Loader