40 HP Rotary Cutter Gearbox With 1 3 8 Inch Smooth Input Shaft And 1 To 1.93 Ratio, 540 And 1000 Max RPM, CCW To CW, Cast Iron Housing, Replaces OEM Gearboxes On 4ft And 5ft Rotary Cutters From Howse King Kutter Mohawk Modern Sunshine Sidewinder GM

40 HP Rotary Cutter Gearbox for 4-5 ft Cutters, 1-3/8 input
✔️ 40 HP unit, single pack, 1-3/8 in input, 1:1.93 ratio, 540/1000 RPM, CCW to CW

This 40 HP rotary cutter gearbox is a direct replacement drive unit for 4 ft and 5 ft rotary cutters from multiple brands. It uses a four-bolt mounting pattern (4-3/4" square) with 5/8" bolt holes and a piloted flange bottom to fit a 5-1/4" pilot hole on the mower deck. It ships without oil (16 oz of 80-90 W).

✅ 40 HP input power
✅ Input shaft: 1-3/8" Smooth
✅ Output shaft: 1-9/16" tapered 12-spline
✅ Gear ratio: 1:1.93
✅ Input speeds: 540/1000 RPM
✅ Rotation: CCW to CW
✅ Cast iron housing, sealed
✅ Mounting: four-bolt pattern 4-3/4" square with 5/8" holes
✅ Pilot hole size: 5-1/4"
✅ Ships without oil; includes 16 oz of 80-90 W
✅ Piloted flange bottom fits 5-1/4" pilot hole

💡 What is a rotary cutter gearbox used for in farming equipment?

In short, it's the power transfer unit that drives the mower blade from the tractor, balancing speed and torque. Handy details:

- Transfers PTO power to the cutter at the correct speed and torque - Provides gear reduction and protects gears and bearings - Fits standard four-bolt mounting patterns and pilot hole sizes - Supports CCW to CW rotation ✝️