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720 Garden Tractor

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=68693
Printed Date: 27 Jun 2025 at 5:45pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 720 Garden Tractor

Posted By: popjohnny
Subject: 720 Garden Tractor
Date Posted: 14 Apr 2013 at 4:04pm

I am in the process of installing a 25 HP Kohler Command engine, in a friends 720 Allis Garden tractor.

I've had to make a motor mount plate. I've got the front pto mounting plate done, and installed.

I have an adaptor to bolt to the flywheel, for the hydrostat belt pulleys, and rear pto shaft mounting assembly.

I've had to notch the frame on the left side, to clear the oil cooler on the engine, which almost fit, without the minor notch.

I now have to cut, and re route the hydraulic lines, going to the front hydraulic couplers, as where they are now, they will be in the way of the oil filter, on the motor.

I cut the lines, and took a piece to the local auto parts store, to get some line.

They told me that brake line should work, and sold me some 5/16 brake line and fittings.

When I got home, the fittings won't fit the original line. Dummy me for not checking that at the store.

So my question is.

What size is the hydraulic lines? I know they are thicker walled than the brake lines I bought.

Also I would need the fittings to make the repair.

Would a compression fitting work OK, or should I use flared fittings?

The Hydrostatic pump, pumps 2.5 gpm, and the pressure is at 550-750 PSI. ( I found the specs on another web site)

I appreciate any and all, responses.

Replies:

Posted By: D-17_Dave
Date Posted: 14 Apr 2013 at 5:48pm

Easiest thing would be to make hoses for this and do away with the metal lines due to the odd size of the lines. You'll just need to tie the hoses in place so they don't rub anything moving in the torque tube.

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Yea, I can fix that.....

Posted By: Coke-in-MN
Date Posted: 15 Apr 2013 at 10:10am

The brake lines seem to have their own thread but you can get a adapter to change them over to pipe thread or ? The brake line pressure would be in the 500 + PSI and brass fitting should stand that pressure but that is about the limit of proofing on them .

Flare fittings or you would need hydraulic compression fittings which are different than most you will find. I used what was called a SWEDGE LOCK fitting which uses a tapered furel and another ring to complete the hydraulic seal on tube.

Also if you try to flange fit brake line be sure to double flare it or it will crack.

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

Posted By: coggonobrien
Date Posted: 16 Apr 2013 at 5:50am

pictures???