Caterpillar RD-7.
Manufactured by the Caterpillar Tractor Co., Peoria, Ill.
Serial number 4832A. This 21,000-pound tractor uses a Cat four-cylinder diesel engine with a 5 3/4" x 8" bore and stroke. It develops 70 brake horsepower at a rated speed of 850 rpm or 86 hp @ 1000 rpm. Owned by Greg Parson, City of Industry, Ca.