King Kutter Cutter, Mower & Tiller Gearbox Parts

Shop gearbox parts for King Kutter rotary cutters, finish mowers, and rotary tillers. Broken Tractor stocks complete gearbox assemblies, input shafts, output shafts, gears, bearings, seals, gaskets, and hardware for 40HP, 60HP, and 80HP gearboxes as well as tiller top gearboxes and side gearboxes.

Fits Models At A Glance:

• 40HP Gearbox Equipment: XB Series 48" Rotary Mower, 4', 5', 5.5', 6' Rotary Cutters, 4', 5', 6', 7' Finish Mowers, 4', 5', 6' Flex Hitch Finish Mowers
• 60HP & 80HP Gearbox Equipment: 5', 6', 7' Rotary Cutters, 6', 7' Heavy-Duty Rotary Cutters
• Tiller Top Gearbox Equipment: TG Series, TG-G Series, RTG Series Rotary Tillers

Key Notes:

• 40HP Gearbox Coverage: Complete gearbox assemblies (shear bolt and slip clutch styles), input shafts, input gears, output pinion shafts, ball bearings, oil seals, gaskets, snap rings, retainer rings, spacers, housing, bearing caps, vent plugs, and castle nuts
• Tiller Top Gearbox Coverage: Complete housings, input pinion shafts, output shafts, bevel gears, bearings (front, rear, output), seals, gaskets, shims, spacers, retainer rings, plugs, and drive shaft tubes
• Application: Power transfer from PTO to cutting blades or tiller tines — gearboxes convert horizontal PTO rotation to vertical blade or tine rotation

Why Choose Broken Tractor:

✅ 40HP, 60HP, 80HP, and Tiller Gearbox Parts In Stock

✅ Complete Assemblies and Individual Components Available

✅ Fast Shipping from U.S. Warehouses

Frequently Asked Questions

Which King Kutter gearbox do I have, 40HP, 60HP or 80HP?

The 40HP gearbox is used on the King Kutter XB Series 48 inch rotary mower, the 4 foot, 5 foot, 5.5 foot and 6 foot rotary cutters, the 4 foot through 7 foot finish mowers, and the 4 foot, 5 foot and 6 foot flex hitch finish mowers. The 60HP and 80HP gearboxes are used on the 5 foot, 6 foot and 7 foot rotary cutters and the 6 foot and 7 foot heavy-duty rotary cutters. Because some cutter sizes appear in more than one group, match the part number on your existing gearbox before ordering, or call (800) 909-7060 so the parts team can confirm the fit.

What King Kutter 40HP gearbox parts does Broken Tractor carry?

Broken Tractor offers complete 40HP gearbox assemblies along with individual components. These include input shafts, input gears, output pinion shafts, ball bearings, oil seals, gaskets, snap rings, retainer rings, spacers, housings, bearing caps, vent plugs and castle nuts. They fit King Kutter rotary cutters, finish mowers and flex hitch finish mowers that use the 40HP gearbox.

Are King Kutter 40HP gearbox assemblies available in shear bolt and slip clutch styles?

Yes, complete King Kutter 40HP gearbox assemblies come in both shear bolt and slip clutch styles. Choose the style that matches the setup on your rotary cutter or mower. Compare the part number on your current gearbox to make sure you get the right version.

What parts are available for King Kutter rotary tiller gearboxes?

We carry tiller top gearbox and side gearbox parts for King Kutter TG Series, TG-G Series and RTG Series rotary tillers. Top gearbox coverage includes complete housings, input pinion shafts, output shafts, bevel gears, front, rear and output bearings, seals, gaskets, shims, spacers, retainer rings, plugs and drive shaft tubes. Fitment can vary by tiller model, so match the part number to your existing part before ordering.

Should I replace the whole King Kutter gearbox or just rebuild it?

It depends on which parts are worn, and Broken Tractor offers both complete gearbox assemblies and individual components for either approach. If only a seal, bearing or gasket has failed, individual parts let you rebuild the existing gearbox. If the housing, gears or shafts are damaged, a complete assembly can be the simpler fix. The gearbox transfers PTO power to the blades or tines by turning horizontal rotation into vertical rotation, so worn internal parts affect the whole machine.