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bobinmaine

how do you fill transmission?

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Hi, Just picked up a 1977 b80 8speed. pulled transmission dip stick (under seat) and very low. I noticed what appears to be fill plug on lower left. Is this to fill or to drain?  Do  you fill thru dipstick opening? Any idea on type of lube is best  and how much it holds? Figure I might as well drain and refill at this point. Totally new to Wheel Horse but always loved looks  of b80, finally  got one  and don't want to wreck it. Any helpful info, tips  and  things I should look  for much appreciated.

 

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Can also remove a bolt or two from the trans top to vent it. 

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:text-welcomeconfetti:to the :rs:  Bob.          Good advice above from Richard and Craig.  

  I would also remove the  plug that you refer to on the lower left, and fill till the oil shows at the hole.

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Welcome to  :rs:

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In my opinion, if you fill through the plug on the side, or use that as your gauge, you will be too low on oil. To prove this, I filled a completely dry 8-speed with the recommended 2 quarts of oil, then removed the side plug and quite a lot of oil ran out.

Best method I have found is to fill through the dip stick tube or shifter hole (with shifter removed)  using a venting method, until you reach the full mark on the dipstick. Filling through the shifter hole is faster, and it allows you to vent through the dip stick tube. It also reminds you to replace your shifter boot.

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Before you drain it add a pint or quart of diesel to the oil and drive around a little (or put it on blocks and run it). When you drain it lift the front end up to get the oil to drain over the hump on the bottom center of the transmission.

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