Garden Tractors - Transmission shifting

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Transmission shifting

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=175374
Printed Date: 21 Feb 2025 at 8:38am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Transmission shifting

Posted By: Randy’s720
Subject: Transmission shifting
Date Posted: 22 Oct 2020 at 11:15pm

I was working on project in the yard for a couple of hours and then the tractor would not move. It’s seems it is not in gear but I did not shift anything. It runs well and hydraulics are ok just will not move forward or reverse.
I checked the linkage and all seem to be working.
Thoughts?

Replies:

Posted By: Bird76Mojo
Date Posted: 23 Oct 2020 at 10:53pm

I'm assuming this is a 720 Allis...

Have you checked that the dual drive belt tension is set to the factory specs? My tractor got very sluggish at one time and it was the drive belt tension. You couldn't tell they were slipping either.. But they were.

GB :)

Posted By: Randy’s720
Date Posted: 24 Oct 2020 at 6:29pm

I was checking and the belts seem very loose and get looser when the clutch is depressed. How are they tightened? I opened the cover and the radiator shroud but could not determine how to tighten the belts. It appreciate the help- it’s a great thing. Randy

Posted By: Bird76Mojo
Date Posted: 24 Oct 2020 at 10:45pm

For me, the easiest way to adjust them was to remove the belly pan and do it from underneath, as well as one adjustment from the top.

Manual pages 16 and 17 I believe: https://www.manualslib.com/manual/1001821/Simplicity-Pow-R-Max-4040.html?page=16#manual" rel="nofollow - https://www.manualslib.com/manual/1001821/Simplicity-Pow-R-Max-4040.html?page=16#manual

GB :)

Posted By: DougG
Date Posted: 25 Oct 2020 at 5:55pm

I never use the foot clutch on them , just the hydro

Posted By: AC720Man
Date Posted: 25 Oct 2020 at 9:03pm

Radiator shroud? Can’t be a 720. What model number tractor do you have?

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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD

Posted By: Randy’s720
Date Posted: 29 Oct 2020 at 12:19am

Sorry meant oil cooler

Posted By: Randy’s720
Date Posted: 29 Oct 2020 at 12:22am

I was just saying if the clutch pedal was depressed the belts seem to be very loose. I agree that in normal operation the clutch is not used.
I am still not sure how to adjust the belts easily.
I noted that when I started the tractor the belts and pulleys were moving but when I put it under load they stopped and no belt movements were noted.

Posted By: Bird76Mojo
Date Posted: 30 Oct 2020 at 11:58am

The drive belts are probably cooked at this point, but you can still check the tension to make sure it's set right. I posted a link to the procedure earlier....

If you push the clutch in, the belts should loosen. That's normal. It stops the pump from turning when you clutch it.

Here's a link to another manual. Download it. Read it.

http://www.michaelstractors.com/forum/upload/mikefox/PowerMaxRepairManual.pdf" rel="nofollow - http://www.michaelstractors.com/forum/upload/mikefox/PowerMaxRepairManual.pdf

GB :)

Posted By: Dusty MI
Date Posted: 31 Oct 2020 at 5:47pm

My 720 did the same thing this afternoon. The hydrostat handle/lever moves very easy now. Maybe a linkage broke or came apart.

I'll dig into it in the next day or two. We put the transmission in neutral and dragged it into the shop.

Dusty

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917 H, '48 G, '65 D-10 series III "Allis Express"

Posted By: Dusty MI
Date Posted: 01 Nov 2020 at 3:39pm

Good news, I got it fixed, a bolt in the linkage came apart/out. Very close quarters to get hands into.

I haven't tried it yet, Not very nice weather outdoors, so I didn't take it out and drive it around.

Dusty

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917 H, '48 G, '65 D-10 series III "Allis Express"