Farm Equipment - model b trans broken

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model b trans broken

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=8546
Printed Date: 29 Oct 2025 at 8:12am
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Topic: model b trans broken

Posted By: boom
Subject: model b trans broken
Date Posted: 23 Feb 2010 at 5:16pm

I am tryin to restore a early 40s model b and when i crank it over in neutral it starts to move forward when i push in the clutch it stops movin. Im thinking one of the gears is rusted to the shaft? but im not sure, any ideas

thanks

Replies:

Posted By: CTuckerNWIL
Date Posted: 23 Feb 2010 at 5:41pm

First if you don't have one already buy a manual. It will more than pay for itself when wrenching on your B.
It is possible the shifter is no longer engaged with a gear and when the lever appears to be in neutral, the transmission is still in gear. You may want to drain the transmission fluid(probably got water and crud in it anyway) and take the side cover off to inspect the tranny. Once you find the problem you can repair it and clean things up..

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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF

Posted By: boom
Date Posted: 23 Feb 2010 at 8:30pm

ive takin it out every thing looked clean as could be and when i pulled it out the shifter seemed like it was where it was supost to be

Posted By: steve(ill)
Date Posted: 23 Feb 2010 at 8:35pm

push the gears into the neutral position with a screw driver. Leave the side cover / forsk off. See that everything turns by hand. Crank the motor and see if it still moves. Top shaft should rotate toward the PTO, but lower shafts and gears are not engaged.

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Like them all, but love the "B"s.

Posted By: Walker
Date Posted: 23 Feb 2010 at 10:43pm

If it is kind of a half hearted lunge I would suspect the clutch is hanging up on the splines. Now if it is doing a leap frog type of thing it must be stuck in two gears.

Posted By: Dick L
Date Posted: 24 Feb 2010 at 5:28am

Sounds like one of the forks on the side plate is not engaged in the one of the gear grooves. It is real easy for one of the slide gears to move when re installing the side plate.