G.M.C.
Page 49
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1 tea Chassis, Farm Tractor.
STAND No. 50.
British Agents: Altoona Motor Co., Ltd., 75412., Brampton Road, London, 8.W.3.
AFINE example of American commercial vehicle construction is the G.M.C. one ton chassis, for which -the concessionneires are the Ancona Motor Co., Ltd., of Brompton Read, London,. S.W. The vehicle is one of the few one tonnere on the British market, and for this reason it has a large following amongst users of a light class of machine.
It incorporates an engine of the fourcylinder Continental type, with a bore and stroke. of 3-1 ins. and 5 ins. respectively; at 1,150 r.p.m. it develops 27.5 h.p., and at its maximum speed of 1,600 np.m. 33 h.p. The crankshaft is carried on three well-proportioned main bearings. The valves are all on the right-hand side and totally enclosed. The engine is provided with a Marvel carburetter fitted with long, flexible, metallic, hot-air inlet pipe, which passes round the back of the cylinders and obtains its heat from a muffle round the exhaust. A governor is fitted. The plunger type nil pump is driven from a cam on the camshaft, and off ie fed directly to the main beerings and to the big-end troughs. An oil indicator is provided on the dash; this conslate of a plunger fitted to a diaphragm in the oil circuit, which is forced out when the oil is under pressure. The drive from the engine is taken through a multiple-dise clutch, which consists of five driving plates and six driven. The driving plates are plain steel, but the driven are lined on both,sideetwith Raybestoe. The gearbox is compact and strong, and gives three speeds forward and a reverse, the change-speed and brake levers being mounted direct on the box, the change speed working on what is known as the "Invisible gate" system. The engine and ,gearbox unit is three-point suspended, the front end being mounted on a trunnion bearing. The back axle is of eolid construction. Final drive is by bevel gearing, and the differential is also of the bevel type. Thcffaxle iscrf the threequarter .floating type, the wheels being supported on the axle tubes by large diameter New -Departure! double-row ball races. Bath 'brakes iet on the same drums, the hand brake working on the inside of the drums, and the, foot brake operating on the outside. A point in the design of the back axle is that the bevel pinion is provided with ball bearings at each end, so that there is no overhang, chattering and wear on the bearings being thus greatly reduced.
The frace is of 3-10 in. channel steel,
the aide-members being parallel. It is of one depth up to.the front, where it taper:, towards the dambirons. From its centre, which is about a foot from the radiator, each side member is adequately reinforced by a channel-steel linerfr'wbich is a verv good fit in the member. At each side of the differential casing is a small plate, which, when removed, allows for adjustment of thei thrust balleraees. The adjusting nut is locked into position by a projection which is in one with each cover.
The wheels are all provided with detachable rims, the tyres fitted being 880 mm. by 120 II1M. 'The care eehibited on the -general design of the chassis is also reflected in the
matter of details, which have received as
much attention; for instance, in the springs. allIthe leaves are ground and
polished, so that lubrication is a Simple matter; the fan has a swing bracket, so that it can be easily adjusted; the foot
boards are mounted Oh substantial brackets and are joined together by a tiered which passes right across the vehicle under the frame; large lubricators are provided at all important points.
The British Wallis tractor, now made by Ruston and Hornsby, Ltd., is also exhibited on this company's stand.