Grizzly® Rotary Gearbox, 75 HP, Smooth Input, 2 In. 15-Spline Output


$179.88 EA

This is a rotary cutter gearbox rated for a 75 HP rotary mower. This gearbox has a 1-3/8 inch smooth input and a 2 inch 15-spline output. The output shaft is 4-5/8 inches long. A 5.625 inch center hole is needed for shaft assembly.

Availability: In Stock -

The 75 HP gearbox is a replacement gearbox for rotary cutters. The input shaft is smooth and 1-3/8 inches in diameter and comes with a shear pin hole. The 2 inch output shaft is 15-spline and 4-5/8 inches long. The gearbox ratio is 1:1.46. The center hole required for shaft assembly is 5.625 inches.

The housing of the gearbox is constructed of ductile iron and the gears are chromium steel mixed with titanium. This construction will provide you years of operation.


  • 75 HP rotary cutter gearbox
  • Main gearbox replacement for rotary cutters
  • 1-3/8 in. smooth input shaft with shear pin
  • 2 in. 15-spline output shaft
  • Housing: 60-45-12 Ductile iron
  • Gear construction: Chromium steel with titanium
  • Center hole for shaft assembly is 5.625 in.
  • Gear ratio: 1:1.46
  • Bolt holes: 4 holes, 3/4 in. diameter
  • Bolt pattern: 8 in.
  • Gearbox shipped without oil; use 85-90 W

Brand: Grizzly

Shipping Information

Your order is important to us and we will strive to process it as quickly as possible. Most in-stock items are shipped within 2-4 business days and typically deliver in 5-7 business days. In-stock items may ship from multiple locations and can arrive on separate days. Heavy or bulky items will ship via Freight/Truck Service and will take 8-10 business days for delivery. For those immediate product needs, we do offer at an additional cost, express service from UPS and Motor freight.

Shipping costs are determined by item weight and your zipcode. Once you have entered your shipping address, city, state, and zip code into checkout, your shipping total will be calculated and available for review. Please see the shipping map below as a guide.

Return Information

Your satisfaction is our priority. If for any reason you are not satisfied with a purchase from Agri Supply, we will gladly refund your money, or exchange the item, or fix it should it break. A minimum one-year warranty applies to all non-perishable items, parts and service from Agri Supply, and all hand tools sold by Agri Supply have a lifetime warranty, regardless of the length of the manufacturer's warranty. See our Agri Supply Guarantee for more details.

To return an item... give us a call at 1-800-345-0169, or visit one of our 8 retail stores near you, and one of our friendly customer service representatives, or store employees, will be glad to assist you.

If you have any questions please contact our Customer Service representatives at 1-800-345-0169

Standard UPS Ground Shipping Map -
UPS Ground
The above shipping chart applies to UPS ground shipments to the 48 contiguous states only. Please call 1-800-345-0169 for timing on shipments to Alaska, Hawaii, and Puerto Rico, thank you!

Review Summary (Based on 1 Reviews)


Customer Reviews

5 Stars 75 horse gearbox

Rusty from MO wrote (May 31, 2014):

Good deal. Fast shipping