Rock Solid 40HP Rotary Cutter Gearbox Featuring 1-3/8 Inch Shaft With 6 Spline Input And 12 Spline Output For 4ft And 5ft Brush Mowers Making Tough Yardscape Cleanup Dead Simple Via Heavy Duty Ductile Iron Build

40HP Gearbox Single Unit Replacement For Brush Mower Decks
✔️ 1-3/8 In Shaft, 6 To 12 Spline, Ductile Iron Build For Yard Cutters

This heavy duty rotary cutter gearbox transfers power from tractor PTO shafts directly to the cutting deck. Sold as a single piece replacement, it swaps onto 4 ft, 5 ft, and 6 ft brush mowers to restore smooth power delivery. Built with a rugged ductile iron housing, it handles thick weeds and woody debris without failing.

✅ 1-3/8 inch input spline with six teeth for secure shaft connection
✅ Twelve spline output designed for direct coupling to mower decks
✅ Four mounting holes spaced at four three quarters inches center to center
✅ One point four seven to one gear ratio for optimal torque multiplication

💡What keeps a rotary cutter gearbox running smoothly through tough brush?

A solid gear set paired with sealed lubrication provides a handy upgrade for aging mower drivetrains without constant maintenance.

- durable steel pinions withstand shock loads from rocks and roots

- threaded plug openings allow quick fluid checks and seasonal drainage

- matched spline counts ensure direct bolt on compatibility with major brands

- oil bath systems maintain cool operating temperatures during summer workdays

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