Farm Equipment - rpm check

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rpm check

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=12708
Printed Date: 31 Jan 2025 at 8:36pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: rpm check

Posted By: john2189
Subject: rpm check
Date Posted: 20 May 2010 at 1:04pm

HI if the pto shaft on a b is 540 rpms, does that mean that the motor is set at the proper rpms ? i think 1800 rpm.

John

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'41 Allis B
'45 Allis B
'49 Farmall Cub
'72 IH Cub

Replies:

Posted By: Hartland Farm
Date Posted: 20 May 2010 at 1:11pm

A Allis Chalmers B with the BE engine is goverened at 1400 RPM. With the CE engine it is 1500.

Posted By: CTuckerNWIL
Date Posted: 20 May 2010 at 1:17pm

No, I believe the CA with the CE engine was rated at 1650 RPM. 540 Pto speed would be in there somewhere but full throttle might not necessarily give you 540 pto rpm's.

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

Posted By: ALinIL
Date Posted: 20 May 2010 at 3:15pm

John - I believe the PTO is 600RPM at the rated 1500RPM rated engine. - AL

Posted By: ALinIL
Date Posted: 20 May 2010 at 3:20pm

Bump - 560RPM at 1400RPM. - AL

Posted By: DrAllis
Date Posted: 20 May 2010 at 9:33pm

If a "B" and a "C" are at 1400 engine RPM the PTO speed is 560........high idle(no load) of 1700 rpm would be 680 RPM at the PTO (if high idle is 1800 RPM, the PTO would be 720 RPM). The "CA" is 538 PTO RPM with the engine at 1650 RPM and that would yield 652 RPM at 2000 RPM (no load) engine speed.