Dumper Added to the Marshall Range
Page 87
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A 2i-cubic-yd. Machine With Singlecylindered Two-stroke Oil Engine
I N addition to its well-known range of road rollers and tractors, Marshall, Sons and Co. (Successors), Ltd., Brittania Iron Works. Gainsborough, is now producing an oilengined dumper. Of 2+-cubic-yds. capacity, the machine is powered by a single-cylindered engine, operating on the two-stroke cycle and the whole is of essentially simple design.
The dumper incorporates the well-proved power and transmission unit of the Marshall agricultural tractor. It has been designed with a view to ensuring maximum stability when working on steep slopes or irregular ground, the centre of gravity being low and the track and wheelbase as large as practicable, 6 ft. and 5 ft. 61 ins., respectively. Weight distribution has also been carefully studied.
To ensure a clean tip the skip is smooth and free from pockets internally, whilst its balance affords gravity return, after tipping, even on a reasonable gradient. Its dimensions are 6 ft. 3 ins. long, 6-ft. 4+ ins, wide and 2 ft. 7 ins. deep, and its upper edge is normally 5 ft. 9 ins, above ground level, The overall length of the dumper is 10 ft. 9 ins, and the standard tyre sizes are 11.25 by 24 and 31 .by 9.
A comfortable bucket seat is provided: with the controls conveniently disposed in relation to it. Whilst the power •imii is governed, its speed can be varied between fairly wide limits. All vital parts of the mechanism are well protected from dust and dirt, and adequate filters for fuel, oil and air, are mounted accessibly. Engine and transmission are easy of access for maintenance. Starting up is claimed to be an easy 'operation by hand without any form of auxiliary heating apparatus. It is stated that on a normal day's clumping, only three gallons of fuel (cesting 6d. a gallon) are consumed.
Engine dimensions are 6+ ins, bore and 9 ins, stroke, a cast-iron piston is used, and the crankshaft runs on selfaligning roller bearings. Approximate running speeds are 5, 7. and 11 m.p.h. in first, second and third gears, and 3.75 m.p.h. in reverse. The chitch is of the multi-spring cone type, with the operating mechanism running in oil. All gears and gear shafts are of nickel-chrome steel machined to fine limits. The final drive is through a fourstar differential.