The 9980 Series Q7 B5666 is a 75 horsepower post hole digger gearbox sized for the larger horsepower tractors used in commercial fencing, vineyard installation and broad-acre infrastructure work. The 4:1 reduction ratio steps the 540 RPM PTO down to a slower, higher-torque auger speed — better for cutting clean holes in heavy clay or rocky soils where a faster small-tractor gearbox would stall.

Standard 1 3/8" x 6 spline input matches all common Australian PTO drive shafts. Output shaft is 2" diameter round with 1/2" cross drilling for standard auger mounting.

Specifications

• Power rating: 75 HP
• Gear ratio: 4:1
• Input shaft: 1 3/8" x 6 spline (standard PTO)
• Output shaft: 2" diameter round, 1/2" cross drilled
• Spare parts available — oil seals, bearings and gears stocked

Freight paid to any destination in Australia. For smaller tractors, see the Q5 B1666 (35HP) and Q6 B4666 (50HP) gearboxes. Augers in a range of diameters available — search "augers" on this website.