Rottary Cutter gear box help needed - AllisChalmers Forum

Author twinsonfarm
Silver Level



Joined: 05 Aug
Location: IL
Points: 129 Post Options    Thanks(0)    Quote  Reply Topic: Rottary Cutter gear box help needed
    Posted: 19 Jul at 9:49pm I have an old Brillion RSS-72 rottary cutter that needs a new gear box.  The bolt pattern is 7 inches x 7 inches  or on a 10 inch circle at the four corners.  I can't find a gear box that would fit.  I only need a 30-50HP gearbox as this is operated with a Allis WD45.  Any suggestion as no one around my area stocks gear boxes.  Jim Sponsored Links JoeM(GA)
Orange Level



Joined: 12 Sep
Location: Cumming,GA
Points: Post Options    Thanks(0)    Quote  Reply Posted: 19 Jul at 10:23pm might check with these people -
Allis Express North Georgia
41 WC,48 UC Cane,7-G's,
Ford 345C TLB steve(ill)
Orange Level Access



Joined: 11 Sep
Location: illinois
Points: Post Options    Thanks(0)    Quote  Reply Posted: 19 Jul at 10:53pm depends on what OUTPUT shaft size you need.. I just bought a replacement for a 6 ft mower... 1-3/8 inch round input with shear bolt, and 1.57 inch output shaft with 12 splines slight taper........ this is the STANDARD gear box for most 5-6 ft mowers.... if your OUTPUT is about 1.75 inch, you have the BIGGER BOX..........the bolt pattern on this one is about 7 inch circle. I would cut a 1/4 inch plate and cover your existing hole and mount this new box on the new plate... Cost was about $150.. Like them all, but love the "B"s. steve(ill)
Orange Level Access



Joined: 11 Sep
Location: illinois
Points: Post Options    Thanks(0)    Quote  Reply Posted: 19 Jul at 11:07pm i doubt that Brillion made the gear box.. There are several "standard" sizes.. you need to know what INPUT shaft size and OUTPUT shaft size you need first...i bought this for a 6 ft mower we use behind a 60 HP FORD.
Like them all, but love the "B"s. wayne IA
Silver Level



Joined: 22 Sep
Points: 67 Post Options    Thanks(0)    Quote  Reply Posted: 20 Jul at 12:13am Another place to look: https://www.surpluscenter.com/Power-Transmission/Gear-Reducers-Gearboxes/Rotary-Cutter-Gearboxes/ Jim.ME
Orange Level



Joined: 19 Nov
Location: Maine
Points: 962 Post Options    Thanks(0)    Quote  Reply Posted: 20 Jul at 5:31am

With over 1 decade of hands-on experience in the agricultural equipment industry, we understand that a dependable gearbox is the heart of any power-driven implement. At FIMIC Implement, we don’t just sell parts - we offer lasting solutions that keep your equipment running smoothly in even the toughest working conditions.

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Our gearbox collection is specifically curated for farmers, landowners, and implement dealers who demand durability, precision, and performance. Whether you're operating a rotary cutter, tiller, or post-hole digger, each compatible gearbox we offer is engineered to meet or equal to OEM standards. 

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Every model is inspected for shaft integrity, housing durability, and gear alignment, and is compatible with popular tractor and implement brands, such as John Deere, Howse, Bush Hog, Omni, or others. We’re happy to help you find the right match.

If you are looking for more details, kindly visit 50 HP Rotary Cutter Gearbox.