New Douglas . Cross-country Range
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ARANGE of medium-duty multi-wheel-drive vehicles has been introduced by Douglas Equipment, Ltd., Cheltenham. It comprises a 4 x 4 (known as the D.M.4), a 6 x 4 (D.M.64) and a 6 X 4 (D.M.6). Perkins R.6 104 b.h.p. oil engines power all the new vehicles. A fourth version, the D.M.42, is also available; this is a fourwheeler with rear-axle drive only.
The D.M.4 is rated for a 5-6-ton payload with 9.00-20-in. (12-ply) cross-country tyres, It has a wheelbase of 11 ft. -6 in., the overall width over the rear wheels is 7 ft. 4 in., and the minimum ground clearance under the axle pots is 9+ in.
A five-speed main gearbox and twospeed auxiliary unit are fitted, these giving gear ratios from 16.7 to 1 to I to 1. Douglas spiral-bevel axles are fitted, and the reduction ratio at the axles is 7.14 to I. Dustproof breathers are used at both axles. Front-Wheel drive can be engaged at will when the high auxiliary ratio is used, but is engaged automatically when driving through the low auxiliary ratio.
Semi-elliptic leaf springs are employed B20 This Douglas D.M.4 4 x 4 oil-engined threeway tipper has been sold to Borax Consolidated (Sales), Ltd. It is to haul iron-ore in Turkey and the cab has been built for tropical conditions.
with progressive units at the rear. Rubber buffers _are fitted, and telescopic dampers can be supplied at extra cost. A vacuum servo assists the hydraulic foot brake, and the mechanical hand brake acts on the rear wheels only.
An all-steel cab with insulated roof is offered, and for working in extreme tropical climates an oil ,cooler, combined with the engine radiator, can be fitted as extra equipment,
The D.M.64 13-ft. 7-in.-wheelbase 6 x 4 employs many components common to the D.M.4 chassis, but the front axle is not driven and air
hydraulic braking is used. The rear bogie has spiral-bevel-drive axles, and 11.00-20-in. (14-ply) tyres are fitted. The payload rating is 8-10 tons.
An 8-10-ton payload is specified for the D.M.6, which has a 15-ft, wheelbase. Four-speed gearboxes are used in this and the D.M.64, in conjunction with two-speed auxiliary units in each case. With a 10-ton payload the D.M.6 is claimed to be able to negotiate a I in 2.25 incline.
Vehicles in this range are already operating in Borneo, Indonesia, Pakistan. Turkey, Spain and Venezuela.