615 gas motor question
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=142081
Printed Date: 14 Aug 2025 at 11:38pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 615 gas motor question
Posted By: Orange4ever
Subject: 615 gas motor question
Date Posted: 02 Sep 2017 at 8:10pm
Found a allis 615 with a gas motor, has mounting brackets for a backhoe, arms for three point hitch, and a 21 spline PTO shaft. Currently has a weight box on the back. Is this a 1000 rpm for running a backhoe attachment or a 540 that somebody has changed out? I've never seen a 21 spline on a gas tractor this small.
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If you want a man to be a successful farmer, give him a Allis Chalmers tractor. If you want him to be a successful mechanic, give him a John Deere
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Replies:
Posted By: Calvin Schmidt
Date Posted: 03 Sep 2017 at 6:51am
I have the same set up with an I 600. The backhoe mounting brackets are a standard part of the loader frame. To mount a factory backhoe, the casting that holds the PTO and the 3 pt hitch has to be removed and the a cover plate installed. It will become a 'bareback' tractor. The PTO has 21 splines but is actually 780 rpm on tractors equipped with a 'shuttle'. This is because the base tractor was designed as a D-15 farm tractor and with the two speed Hi/Lo 'power director' the PTO is standard 540. Shuttle is achieved by reversing the low speed clutch pack with the weird PTO speed a result.
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Nothing is impossible if it is properly financed
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Posted By: Randaleky
Date Posted: 03 Sep 2017 at 7:06am
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My PTO shaft is 21 spline on my Allis HD4 dozer. I wonder if anyone has ever found a adapter that is 21 spline on the female end and the modern type 6 spline male found today ? I would like to mount a post hole drill on the back of the dozer.
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Posted By: Calvin Schmidt
Date Posted: 03 Sep 2017 at 8:14am
Common adaptor that most farm dealerships will have.
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Nothing is impossible if it is properly financed
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