King Kutter 60HP & 80HP Rotary Cutter Gearbox

Replacement gearbox parts and complete gearboxes for King Kutter 60HP and 80HP rotary cutters, covering input shafts, output shafts, gears, bearings, seals, gaskets, caps, and hardware for shear bolt and slip clutch configurations.

Fits Models At A Glance

• 60HP Gearbox: 5' Rotary Cutter, 6' Rotary Cutter (Shear Pin and Slip Clutch Input)
• 80HP Gearbox: 6' Heavy-Duty Rotary Cutter, 7' Heavy-Duty Rotary Cutter (Slip Clutch Input)

Key Notes

• Application: Complete gearboxes and internal service components for heavy-duty rotary cutters.
• Input Options: Shear bolt style and 6-spline slip clutch input shafts available.
• Output Shaft: 15-spline output on 80HP units; stump jumper hardware included.
• Wear Parts: Bearing cups, cones, races, oil seals, gaskets, vent plugs, and caps.

Why Choose Broken Tractor

• ✅ Correct parts matched to your gearbox model
• ✅ Fast shipping from two US locations
• ✅ Knowledgeable support on King Kutter gearboxes

Frequently Asked Questions

What is the difference between the 60HP and 80HP King Kutter rotary cutter gearboxes?

The 60HP gearbox fits 5' and 6' rotary cutters, while the 80HP gearbox fits 6' and 7' heavy-duty rotary cutters. The 80HP unit uses a 15-spline output shaft and a splined slip clutch input. Broken Tractor carries complete gearboxes and internal service parts for both sizes.

How do I know if I have a shear bolt or slip clutch King Kutter 60HP gearbox?

The input style depends on how your cutter drives the gearbox: shear bolt gearboxes use a shear bolt input shaft, while slip clutch gearboxes use a 6-spline input shaft. We carry both the shear bolt style input shaft (SKU 186020) and the 6-spline slip clutch input shaft (SKU 186015) for the 60HP gearbox. If you are unsure which you have, match your existing shaft to the part or confirm with our parts team.

What parts do I need to rebuild a King Kutter 60HP rotary cutter gearbox?

Broken Tractor offers the individual service parts to rebuild a 60HP gearbox, including input and output shafts, input and output gears, bearing cups and cones, oil seals, gaskets, spacers, caps, and vent plugs. Common wear items include the input shaft oil seal (SKU 156040), output shaft oil seal (SKU 156035), and input and output bearing sets. Match each part number to your gearbox model and input style before ordering.

Will the 15-spline output shaft fit my King Kutter 80HP gearbox?

Yes, the 15-spline output shaft (SKU 186035) fits King Kutter 80HP gearboxes on 6' and 7' heavy-duty rotary cutters with slip clutch input. The 80HP complete gearbox (SKU 184080) also comes with the 15-spline output and splined input shaft. Confirm your cutter size and input style when ordering.

Does the King Kutter gearbox vent plug fit both the 60HP and 80HP gearboxes?

Yes, the 1/2-inch NPT vent plug (SKU 131035) fits King Kutter 40HP, 60HP, and 80HP gearboxes, including the 60HP 5' and 6' rotary cutters and the 80HP 6' and 7' heavy-duty rotary cutters. The 1/8-inch plug (SKU 131040) also covers the same gearbox range. Broken Tractor carries both for shear pin and slip clutch configurations.