Farm Equipment - Rebuilding gearbox

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Rebuilding gearbox

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=129934
Printed Date: 05 Jul 2025 at 3:09pm
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Topic: Rebuilding gearbox

Posted By: rustyorange45
Subject: Rebuilding gearbox
Date Posted: 12 Oct 2016 at 2:47pm

I finally finished putting the gearbox to my model 184 rotary mower back together. New bearings, seals, and gaskets. It turns smooth, but a lot harder than I think it should. I started it up and mowed my fence row, and when I was done the gearbox was too hot to touch. It still turns smooth and doesn't make any noise. Will it run cooler when the bearings wear in? Anyone with experience of this? Thanks!

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1953 WD45 WF/Model 90 Loader, Oxnard Rear Blade, 80R Mower, Model 209 Disc, WD Rear Mounted Scoop, Model 184 & 160 Rotary Mowers, 1952 CA NF/L306CA mower, 1953 CA WF/Model 8 Loader.

Replies:

Posted By: CrestonM
Date Posted: 12 Oct 2016 at 2:53pm

Do you set bearing pre-load on these? I wouldn't think so(I would think they would be sealed) but if so, they might be too tight.

If they're sealed, unless something isn't lined up just right and is causing more friction, I wouldn't think it would get too hot.

My brushhog gear box gets pretty warm, but not that hot. It's a TSC brand.

Posted By: Hubert (Ga)engine7
Date Posted: 12 Oct 2016 at 3:02pm

X2, sounds like the bearings are too tight.

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Just an old country boy saved by the grace of God.

Posted By: Gary(VA)
Date Posted: 12 Oct 2016 at 3:25pm

Did you make sure the gears have backlash and aren't too tight? Are there shims that can be installed or removed as needed?

Posted By: Leon n/c AR.
Date Posted: 12 Oct 2016 at 4:00pm

On my Howse brand hog you add or remove paper gaskets on the input side to preload brgs and gears. Leon

Posted By: thendrix
Date Posted: 12 Oct 2016 at 4:55pm

How did the bearing bores look? If the bearings go in a little off you can still get the shaft in but you'll have more pressure to one side and cause excess friction

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"Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan

Posted By: Dans 7080
Date Posted: 12 Oct 2016 at 8:07pm

How full is it on oil? Overfilling will cause a gearbox to excessively heat.

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When someone tells you Nothings Impossible, Tell them to slam a revolving door

Posted By: MACK
Date Posted: 12 Oct 2016 at 9:34pm

How big is the cutter and much HP is on the front? MACK

Posted By: rustyorange45
Date Posted: 13 Oct 2016 at 8:05am

The bottom shaft is where it is tight. The bottom bearing is pressed on to the shaft to the stop and I pushed the top bearing down the shaft into the race and then pushed the gear onto the shaft. At this point it was tight. I had packed the bearings with wheel bearing grease. When I put the top of the gearbox together it spun easily and I used the shim gaskets to get my gear backlash right. I filled with 2.5 pints of 140 weight gear oil as per owners manual. It is 7 foot pull type mower pulled by a WD45.

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1953 WD45 WF/Model 90 Loader, Oxnard Rear Blade, 80R Mower, Model 209 Disc, WD Rear Mounted Scoop, Model 184 & 160 Rotary Mowers, 1952 CA NF/L306CA mower, 1953 CA WF/Model 8 Loader.