Farm Equipment - Allis Chalmers 175 hydrolic pump

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Allis Chalmers 175 hydrolic pump

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=183098
Printed Date: 15 Oct 2025 at 10:39pm
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Topic: Allis Chalmers 175 hydrolic pump

Posted By: elec
Subject: Allis Chalmers 175 hydrolic pump
Date Posted: 06 Sep 2021 at 6:42pm

My 175 has a pump on the side, I've seen others that have the pump on the motor instead. Anybody know what year they switched? I'm looking at buying another 175 and it has the pump on the motor.
Thanks

Replies:

Posted By: DrAllis
Date Posted: 06 Sep 2021 at 7:05pm

Front pump began at s/n 175-2035 in late 1973.

Posted By: tbran
Date Posted: 08 Sep 2021 at 8:56pm

Cost reduction.... changed pump eliminated bevel gear hollow shaft, along with power steering change= $250 per tractor we were told savings plus less assy time.

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When told "it's not the money,it's the principle", remember, it's always the money..

Posted By: SteveM C/IL
Date Posted: 09 Sep 2021 at 8:46am

$250 was real money back then

Posted By: allisbred
Date Posted: 09 Sep 2021 at 11:39am

Did the front axle change at the same time as the pump or prior?

Posted By: DrAllis
Date Posted: 09 Sep 2021 at 12:20pm

The change made the front support (under the radiator) a hollow box weldment, instead of a casting with steering gears inside. It then housed the hydraulic pump mounted inside of it. The wide front axle design changed and a narrow front axle/single front wheel were no longer available. The GPM's of the hydraulic pump were reduced about 10% or so because of direct drive/engine speed, where the old system was a speed up drive.