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5-Ton Prime Mover Model 92A (1932)

5-Ton Prime Mover Model 92A (1932): Japanese

It is reported that there are two variations of this vehicle. Model A is powered by a 6-cylinder in-line L-head Sumida gasoline engine, and Model B by a 6-cylinder in-line air-cooled Isuzu Diesel. As far as may be ascertained, with exception of a modification in radiator design, the general appearance and suspension of these two models is similar.

The Model A engine is an L-head type with the valves on the side. The cylinder bore is 110-mm, the stroke 135 mm, and the compression ratio is 4.5:1. The normal hp. is 64 at 1,200 r.p.m.; the maximum hp. is 98. Ignition is provided by a Bosch high-tension magneto with 12-v. charging generator and two 12-v. 60 amp.-hr. vibration-proof batteries. The electric starting motor is 12-v. with a rating of 2.5 hp. Bevel spur pinion and ring gears have reduction ratios of 2.66 and 5.

The steering system is the clutch brake type with both hand and foot-operated brakes. The transmission provides four speeds forward and one reverse. The maximum speed is 19 k.p.h. (11.8 m.p.h.). The lubricating oil is distributed by gear pump force-feed system. Oil pressure registers 1.0 kg. (2.2 lb.) at low speed and 2 kg. (4.4 lb.) at 1,100 r.pm. The oil capacity measures 14.65 liters (3.7 gal.). A vacuum fuel system is used with Stromberg UT 4 model carburetor. The main fuel storage tank holds 125 liters (32 gal.), the auxiliary tank 55 liters (14.5 gal.). Fuel consumption is 17 liters (4.5 gal.) per hour, or 1.05 liters per km. (2.4 mi./gal.). The cooling liquid is circulated by a centrifugal pump from a radiator, which carries 39.5 liters (10.4 gal.). The grade ability of this vehicle pulling a fixed weight is 30°. The winch capacity is 2.5 metric tons (2.8 tons). The winch cable length is 20 meters (65 1/2 ft.).

SPECIFICATIONS

Weight        4.8 Metric tons—5.28 tons
Trailer load capacity 4.5 Metric tons—4.9 tons
Winch capacity 2.5 Metric tons—2.75 tons
Length 3.55 m—11 ft., 8 ins.
Width 1.71 m—5 ft., 11 ins.
Height 2.35 m—7 ft., 8 ins.
Ground clearance .295 m—11.75 ins.
Tread centers 5 ft., 11 1/2 ins.
Ground contact 7 ft., 4 1/2 ins.
Track width 9 7/8 ins.
Track links 59
Fuel tank Main, 32 gals.; aux., 14.5 gals.
Fuel consumption 2.4 m.p.g.
Fording depth 24 ins.
Speed
   Hard roads 18 m.p.h.
   Cross-country 8 m.p.h.
Engine Sumida, 6-cyl., gasoline
Bore and stroke 110 mm x 135 mm—4.33 ins. x 5.31 ins.
Horsepower 64 at 1,200 r.p.m. (normal)
Ignition Bosch high-tension magneto
Battery 2 12-v., 60 amp.-hr.
Transmission 4 speeds forward. 1 reverse
Steering Clutch brake
Crew 6

Japanese: p. 12 (April 1, 1945)