Garden Tractors - Sickle Mower speed

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Sickle Mower speed

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=206728
Printed Date: 16 May 2025 at 10:53pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Sickle Mower speed

Posted By: sdunt
Subject: Sickle Mower speed
Date Posted: 15 May 2025 at 9:29am

Howdy, thanks for letting me join.

I just picked up a Simplicity 785 Sickle bar mower, its needs some restoration, the sellers said it had been sitting outside for 5+ years. So LOTS of PB Blaster, etc.

Now, don't shoot me, but I run JI Case garden tractors, I have a 1968 and a 1973 Loader model. My son also runs Case. Therefore, we want to adapt this sickle bar unit to fit our 3 point, and drive it with a hydraulic motor.

How fast does the drive pulley on an Allis 710/712/716 run ? This is the sickle model with the planetary gear reduction. The mower manual says to run the tractors engine at 3/4 throttle, so that's about 2400 RPM.

Does the PTO pulley run as engine speed?

Replies:

Posted By: HudCo
Date Posted: 15 May 2025 at 10:59am

dont know the answer to your question but ji case garden tractors are cool, what models are they

Posted By: sdunt
Date Posted: 15 May 2025 at 11:27am

My 1968 is a Model 155 which is a 10 HP (kohler) "small wheel" unit

My 1973 is a Model 646 Loader tractor (16 HP Onan CCKa) with 3 Point. I also have OEM pallet forks for the loader. I use the pallet forks to move things all over my 2+ acres property. I also have a Hydraulic drive tiller for use with 646.

Plan is to use the Simplicity 785 Sickle mower on the 646 to mow ditch, and under many large trees on the property.

Posted By: acken
Date Posted: 15 May 2025 at 7:43pm

PTO pulley is engine speed, gears inside bevel gearbox are 1 to 1 ratio.

Posted By: sdunt
Date Posted: 16 May 2025 at 6:45am

Cool, thanks for the reply. That will help me figure out what type of hydraulic motor and pulley sizes.