The Muir-Hill 161 is a four-wheel drive (4WD) tractor produced from 1969 to 1975 by Muir-Hill in Manchester, England. It features a powerful Perkins 8.4L 8-cylinder diesel engine delivering 185 hp (138.0 kW) with a 10-speed Fuller RT 610 gear transmission. The tractor includes power steering, a standard cab with optional air-conditioning, and an open center hydraulic system with 2 valves and 25 gpm pump flow. It has a rear Type III hitch and rides on 23.1/18x26 agricultural tires front and rear. Dimensions include a 78-inch wheelbase, 165.1-inch length, 97.5-inch width, and a weight of 12,000 lbs (5443 kg).