The 4-ton Prime Mover is powered by a 90°, V-8 air-cooled gasoline engine with a cylinder bore of 90 mm and a piston stroke of 125 mm. The normal horsepower is 73 at 1,600 r.p.m.; maximum horsepower is 88. The firing order is 1-8-7-3-6-5-4-2. The electrical system includes a Bosch type magneto (Gesal model); a Bosch R.T.C. 900 LI model, 75-watt generator; a 12-v., 80 amp.-hr. storage battery, and a Bosch 2.5 hp. electric starting motor. The ratio of the final drive is 5.657:1. Clutch brake steering is used and both hand and foot operation applies the brakes. The transmission is the central selector type with 4 speeds forward and 1 reverse.
The vehicle is capable of towing its complement of artillery at 25 m.p.h. There is a main and auxiliary type of lubricating oil pump. Oil pressure is 4.4 to 6.6 lb. of gage pressure when warmed up. A Stromberg
SPECIFICATIONS
| Weight | 4 tons | |
| Trailer load capacity | ||
| Winch capacity | over 2 tons | |
| Length | 12 ft., 5 ins. | |
| Width | 6 ft., 1 in. | |
| Height | 7 ft., 3 ins. | |
| Ground clearance | 11.5 ins. | |
| Tread centers | 5 ft., 4 ins. | |
| Ground contact | 7 ft., 8 ins. | |
| Track width | 10 ins. | |
| Track links | 5 1/2 ins. | |
| Fuel tank | Main, 26.6 gals.; aux., 15.8 gals. | |
| Fuel consumption | ||
| Fording depth | 20 ins. | |
| Speed | 25 m.p.h. | |
| Engine | V-8 cyl., air-cooled, gasoline | |
| Bore and stroke | 90 mm x 125 mm—3.54 ins. x 4.92 ins. | |
| Horsepower | 88 (max.) | |
| Ignition | Magneto | |
| Battery | 12 v., 80 amp.-hr. | |
| Transmission | Selector type; 4 speeds forward, 1 reverse | |
| Steering | Clutch brake | |
| Crew | 6 |
Japanese: p. 11 (April 1, 1945)