Replacement Rotary Mower Cutter Gearbox for King Kutter, Woods Xt160, Big Bee Agri 5 Shredder, Howse 5 FT, Landpride, Kubota, Pittsburgh, Mohawk Brave

Replacement Rotary Mower Cutter Gearbox for King Kutter, Woods XT160, Big Bee Agri 5 shredder , howse 5 ft, Landpride,  Kubota, Pittsburgh, Mohawk Brave

 

• Durable Protection: Fits most light duty rotary cutter machines that require shear pin protection and includes 5 replacement shear bolts to add to your rotary kit.
• Fits Models: RD5, RD6, RZ160, RZ60 - Gearbox Assembly P/N 00786192. Razorback Series BH4, BH5, BH6, BH4-2, BH5-2, BH6-2. BMB 1080, BMB 10300, Hardee C1378, Mohawek 14-500, Rhino 0711050100, Rhino 71105, Omni 250123, Omni 250001, SE Big Ox 1970, Sidewinder 26272, and Others
• Industry standard 1-3/8" smooth diameter input shaft with 1/2" shear bolt hole and retaining ring groove and 1.57" diameter 12 tapered spline output shaft allow fitment to most light, standard and medium duty rotary cutters.
• 1:1.47 Ratio for use on 5' and larger diameter rotary cutters
• Each gearbox features high speed ball bearing units and heat treated gears and shafts to ensure long life. Four bolt mounting matches industry standards. Each gearbox includes blade carrier mounting nut and cotter pin. Gearboxes are shipped dry and require 16 ounces of 90W or 85w140 gearlube or equivalent.

Role of the Gearbox in a Rotary Mower Cutter

Right-angle power transmission: A tractor's PTO shaft typically extends horizontally from the rear of the tractor. However, a rotary mower's blades rotate horizontally beneath the deck. The gearbox effectively changes the direction of the rotary power by 90 degrees, transmitting it from the PTO shaft to the vertical output shaft that drives the blades.

Speed optimization: While the gearbox is primarily responsible for direction conversion, it also optimizes speed. It typically maintains or slightly increases the speed of the PTO to ensure that the blades rotate at the very high speeds required to efficiently cut, chop, and mulch grass, weeds, and shrubs.

Torque transmission: Cutting dense vegetation, especially thick brush or small saplings, requires a lot of torque. The gearbox efficiently transmits the high torque of the PTO to the cutting blades, allowing them to forcefully impact and chop tough plant material.

Load management and protection: Rotary mowers operate in very demanding environments. The gearbox must withstand constant heavy loads, sudden shocks when the blades hit hidden obstacles such as rocks or stumps, and severe vibrations generated during cutting. It is designed to absorb these stresses, protecting the tractor's PTO and the mower's cutting mechanism from damage.

Safety feature integration: Many rotary mower gearboxes are equipped with shear bolts or slip clutches on the PTO drive train. These safety devices are designed to break or slip when they encounter excessive loads (such as hitting a large rock), immediately disconnecting power and preventing serious damage to the gearbox, blades or tractor's PTO system.

Applications of Rotary Mower Cutter Gearboxes

Agricultural Rotary Mowers (Brushcutters/Brushmowers): This is the primary application. They are used to clear pastures, maintain fields, trim overgrown brush, and shred crop residues.

Precision Mowers (Large Agricultural/Commercial): Although designed for finer mowing, large precision mowers used for large area operations also rely on rugged gearboxes to drive their multiple horizontal blades.

Orchard and Vineyard Mowers: Specialized rotary mowers used to maintain ground vegetation and manage vegetation between rows of trees or vines.

Roadside Mowers: Mowers used to maintain curbs and ditches along roads, often encountering a variety of difficult vegetation.

Utility and Industrial Mowing: Used to maintain open spaces around power lines, pipelines, and other industrial sites.

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