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post #1 of 3 Old 05-29-2019, 06:47 PM Thread Starter
Join Date: Aug 2018
Location: Michigan
Posts: 31
Troy-Bilt Horse gear oil

I just picked up a mid-70's Troybilt tiller. My question is, Is there a drain plug for the trans other than the one on the side of trans which I understand to be the overfill mark.
I would like to drain all the old oil out and put in new. Also can I get the oil at auto stores?
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post #2 of 3 Old 05-29-2019, 08:15 PM
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Join Date: May 2015
Location: Oklahoma
Posts: 867
Re: Troy-Bilt Horse gear oil

If you want exact responses we need a model number? Other than that some troy bilts have a drain plug lower down, some you have to remove the top handle cover plate, some use 80-90-140 gear oil.

Normally not a critical gear oil. I've even dumped in a 1/2 tube of EP2 gun grease to mix with the 140 oil.
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post #3 of 3 Old 05-29-2019, 08:25 PM
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Join Date: Jun 2011
Location: MA
Posts: 7,536
Re: Troy-Bilt Horse gear oil

There is a section here dedicated to Tillers...

Grab your manual here:

Also, download the Transmission Service Manual (also on that page).

As for the oil, NAPA has this:

It is GL-4, but the label says it's OK for yellow metals.

Troy Bilt's website used to have an FAQ posting on the issue, seems like MTD may have misplaced that?

EDIT: Found it:

  • Tiller Transmission Lubricant
  • Sep 11, 2017•FAQ
  • 000002341
  • What lubricant should be used in the tiller transmission case?
  • In the past the rule was: For partial fill-ups (a few ounces or less) use SAE 140, SAE 85W-140 or SAE 80W-90 weight gear oil with an API rating of GL-4 or GL-5. For full replacement use SAE 140 or SAE 85W-140 gear oil with an API rating of GL-4 only.
  • We have also found that 80W-90 oil with an API rating of GL-1 is acceptable for both partial and full replacement of tiller gear oils.
  • We have 80W-90 lubricant available (12 quart case) at our Online Parts Store as part number 737-04040.
  • This oil is also available at most automotive supply stores.

I've seen a number of newer articles online stating to avoid GL-5 due to additives that may harm yellow metals.

Good luck, keep us posted with your progress.



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Last edited by mikeinri; 05-29-2019 at 08:37 PM.
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