Date: September 5, 2026 Posted by: admin In: gearbox

40 HP Gearbox 1-3/8 6-Spline Input 1:1.47 Ratio 540/1000 RPM for Rotary Cutter. The 40 HP Rotary Cutter Gearbox is a heavy-duty replacement gearbox engineered for rotary cutters and brush mowers requiring dependable power transmission and long service life. Featuring a 1-3/8-inch 6-spline input shaft, 1-9/16-inch tapered 12-spline output shaft, and a 1:1.47 gear ratio, this gearbox delivers smooth, efficient operation for demanding mowing applications. Constructed with a rugged cast iron housing, the gearbox is fully sealed to protect internal gears and bearings from dirt, moisture, and debris. The 4-3/4-inch square mounting pattern and 5-1/4-inch pilot flange provide a direct replacement for many OEM gearboxes used on 4′, 5′, and select 6′ rotary cutters. Part Type: Rotary Cutter Gearbox. Maximum Input Power: 40 HP. Gear Ratio: 1:1.47. Input Shaft: 1-3/8 6-Spline. Output Shaft: 1-9/16 Tapered 12-Spline. Input Speed: 540/1000 RPM. Shaft Rotation: CCW to CW. Heavy-duty cast iron housing for superior durability. Sealed housing protects gears and bearings from contamination. 4-3/4 square mounting bolt pattern. Fits 5-1/4 pilot hole in mower or cutter deck. Ideal replacement for worn or damaged rotary cutter gearboxes. Other compatible rotary cutters with matching specifications. 16 oz of SAE 80W-90 gear oil. Restore dependable cutting performance with this 40 HP Rotary Cutter Gearbox, engineered for durability, efficient power transfer, and long service life. Featuring a heavy-duty cast iron housing, precision-machined shafts, and a direct-fit mounting design, it is an excellent replacement for many OEM gearboxes used on rotary cutters and brush mowers. Please confirm all measurements and specifications before installation to ensure the correct fit. Not sure will this part fit? We can search quickly and confirm or find you the correct one! You need correct replacement? Just let us know and our. Parts specialist will help right away!