Garden Tractors - AC GT811 Garden Tractor

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AC GT811 Garden Tractor - rear end oil type?

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Garden Tractors
Forum Description: A great place to discuss the Simplicity and Allis Chalmers Garden Models
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=95113
Printed Date: 12 May 2024 at 4:18am
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Topic: AC GT811 Garden Tractor - rear end oil type?

Posted By: 19tanker
Subject: AC GT811 Garden Tractor - rear end oil type?
Date Posted: 14 Sep 2014 at 3:41pm

Hello,

Does any one know what kind of oil should be placed in the rear end of a 1980 AC GT811?

I have had it a couple years (hand me down from my father-original owner), and I would like to service the rear-end. I am guessing it is some sort of 90 weight? Cant find a thing on the internet pertaining to my question. Dad does not recall, but thought it was 90 weight. He no longer has the manuals, of course.

Any help would be great!

Replies:

Posted By: LionelinKY
Date Posted: 15 Sep 2014 at 7:42am

You are correct in that it should use some kind of gear lube like 90W. I have even used some 85W-140 in some of mine and it seems to work well also actually quieting down a couple of my older gear trains.

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"My name is Lionel and I'm an Allisoholic"

Posted By: 19tanker
Date Posted: 15 Sep 2014 at 2:53pm

Ok, that is what I thought. I have several gallons of the 90 weight for my trucks, so I will just use it.

I need to think about re-powering that tractor too, any suggestions? I thought I would just get a 20hp Briggs (about $450 at Northern Tool-minus the muffler and the tank, etc)

Posted By: LionelinKY
Date Posted: 15 Sep 2014 at 9:12pm

Any vertical shaft engine ought to work. I don't know about jumping from 11 hp to 20 hp though. I myself would be concerned about the transaxle being able to handle that. 20 hp is more for hydrostatic trans since they take so much power just to run. The old gear shifts like yours don't require as much power to move them.

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"My name is Lionel and I'm an Allisoholic"

Posted By: 19tanker
Date Posted: 16 Sep 2014 at 5:25pm

Good point, and I did kind of wonder about that as well. Thank you for the advice!!