40HP RC30 Rotary Cutter Gearbox delivers reliable torque multiplication and matched speed for wide swaths, enabling smooth mowing on tractors, featuring a 1 3/8 inch input and 12-spline CCW output for durable field and shop use

40HP RC30 Rotary Cutter Gearbox, 1-3/8 input (Single)
✔️ 1:1.47 ratio, 1-3/8 input, 12-spline output, CCW

This 40HP gearbox drives RC30 rotary cutters, providing reliable torque multiplication and matched speed for mowing wide swaths. It's a common fit for field and shop work on tractors with RC30-compatible decks, especially when using 5' or larger diameter cutters. The input shaft is 1-3/8" (35 mm) and the output is a 12-spline interface; four-bolt mounting is standard and blade carrier mounting nut and cotter pin are included.

✅ Gear ratio: 1:1.47 speed-up for 5' and larger diameter rotary cutters
✅ Input shaft: 1-3/8" (35 mm) smooth input
✅ Output shaft: 12 tapered spline
✅ Rotation: counterclockwise, 540 RPM
✅ Power rating: 40HP at 540 RPM
✅ Lubrication: ships dry; requires 16 oz of 80-90W gear lube
✅ Mounting: four-bolt with blade carrier nut and cotter pin included

💡 What is a gearbox used for in rotary cutter systems and how does a 40HP RC30 gearbox help?

A handy overview shows why this kind of gear reducer matters in heavy cutting setups. - Torque multiplication lets you mow heavier loads without bogging down - Keeps cutter speed aligned with PTO for steady, clean cuts - Handy with RC30 decks and standard four-bolt mounting - Requires proper lubrication and checks for long life