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From Pontoon. Carrier to Timber Trailer

17th December 1948
Page 51
Page 51, 17th December 1948 — From Pontoon. Carrier to Timber Trailer
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Ex-W.D. Equipment, Including Crossley Lorry, Converted to Carry 25-ton Loads of Timber Over Rough Ground

THE conversion of ex-W.D. equipment for peace-time operation often calls for considerable rebuilding, and frequently a certain amount of redesigning. One of the accompanying illustrations shows a Crossley Army lorry coupled up to what was originally a pontoon carrier. The outfit, as shown, represents one of the largest timber-hauling combinations at present in use in this country.

So far as the tractive unit is concerned, all superfluous brackets were removed, the frame was shortened, and the whole structure substantially reinforced. The rebuilding included a base to take tht bolted-on winch and a frame stsucture to support the sprag, which was fabricated out of heavy-gauge steel of various sections.

Two substantial hooks were made, and welded on to the end of the chassis frame-members to take the chain which holds the sprag off the ground when travelling.

One of the most interesting features of this conversion concerns the ingenious manner in which the trailer pole, which is of square section, was redesigned in respect of its mounting in the rear carriage. In its original form no provision was made for independent oscillation of the two carriages, and as the pole is of exceptionally rigid construction, there was little chance of the four wheels maintaining contact with the ground when the trailer was taken over rough surfaces. The alteration consisted of cutting the pole breach to receive a 10-in, tube, and of building up the rear end of the square pole in such a way that, whilst it is truly located in the tube, the carriage is free to oscillate round it. In its present form the outfit is capable of hauling a load of 25 tons over the roughest terrain. Brakes are fitted to the four wheels of the trailer, those on the front being servobperated, and those on the rear applied via a hand wheel and cable.

All the fabricating work was carried out by the aro-welding process, using Philips 48 welding rods. Messrs. P. S. Alcock's, Brockley. Northants, were responsible for carrying out the conversion.

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Organisations: Crossley Army

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