The Caterpillar D5 SA Special Application is an agricultural crawler tractor produced from 1967 to 1976. It features a Caterpillar D333 turbocharged 6-cylinder diesel engine with 525 ci (8.6 L) displacement, delivering 90 hp (67.1 kW) drawbar power. The tractor has a 5-speed gear transmission with 3 reverse gears and a crawler drive. It has 18-inch wide tracks and weighs 20400 lbs (9253 kg). The hydraulic system is open center with a capacity of 11.5 gallons and variable pressure ratings depending on the model year. Electrical system includes a 12-volt battery and 50 amp alternator charging system.