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eg i OMPARISON
Page 68
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Three 16-ton gross tippers
FOUR-WHEEL tippers have been the willing slaves of the building and construction industry for many years, so for this group test of British-built tippers we asked manufacturers to provide representative models from their 16-tongvw ranges.
Chrysler provided a vehicle from its new Commando range; Ford, a D1614 as specified for George Wimpey Co. Ltd, and British Leyland a Clydesdale as specified for Stanley N. Evans Ltd, Birmingham. Regrettably Bedford was unable to supply a vehicle.
Through the courtesy of George Wimpey Co. Ltd, we were able to test each vehicle in the same conditions on the nearly completed Newmarket by-pass in Suffolk. The tippers were slotted into normal operations, carrying ballast from a quarry adjacent to the site to sections of uncompleted road where the ballast was required for the sub-surface levels.
The test was split into two parts; on the first day the tippers completed a round trip of about 35km (22 miles) per drop, on the second day the mileage was decreased to about 14km (9 miles) per drop. All the running was on the by-pass, which was patched with sections of unmade road that provided typical on-site conditions. Loading was by an RB-42 fitted with a drag link and shovel, or a Caterpillar shovel, and it was estimated from the volume of ballast loaded that vehicles carried an average payload of 11.2 tonnes (11 tons).
Our report is divided into six sections: vehicle operational suitability; maintenance and component accessibility; specifications; maker's recommended service times; maker's recommended spares prices — correct at March 4; and an operating cost guide.
For the first section we were assisted by Mr. J. White, foreman fitter at the Newmarket site, who gave his views on vehicle suitability from the maintenance aspect.
Apart from fuel consumption, where the Clydesdale proved the most economical, no single vehicle's performance outshone that of the others. On the road, any speed advantages were lost in the delays when loading at the quarry or waiting to tip in the correct place. The same argument also applies to the tipping operation; regardless of ram speed, the overall tip time depended on the skill of the driver in leaving an even layer of ballast behind him as he tipped, and the preference of the construction staff who dictated how, when and where the load was to be discharged.