A NEW LIGHT S MUER TO HAUL 15 TONS A N
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entirely new trio, consisting of a six-wheeler, an eight-wheeler and a tractor unit, has been introduced by Transport Vehicles (Warrington), Ltd., John Street, Warrington. as the initial offering in the T.V.W. range.
The light six-wheeler has been planned for a gross weight of 20 tons, which, allowing up to 5 tons for the unladen vehicle, indicates 15 tons as the total legal payload. On all three models the equipment is comprehensive and the manufacturers have given special attention to the . need for accessibility. All have 9.00-20-in. tyres and 10-stud wheels.
On two models a special version of the Cornmer TS3 two-stroke oil engine is employed, this giving an output above the standard figure. Other power units are available. The eight-wheeler is supplied with a Gardner 6LW oil engine, with the Meadows as an alternative.
The six-wheeler has a 15-ft. 6-in, wheelbase, but others can be produced. The measurement from the rear of the cab to the end of the frame is 22 ft., the overall width 7 ft. 4 in., and overall length 27 ft. 6 in. The frame, Which is 3 ft. 3 in. wide, is built up of 10-in. by 3-in.-section 1-in. channel steel, the upper run of the frame being 3 ft. 2 in. above ground level. There are eight cross-members, all of which have full-depth boxed ends.
The TS3 engine operates in conjunction with the Meadows five-speed overdrive gearbox, which has the Porsche synchromesh gear change. Gear ratios are 6.12, 3.32, 1.75 and 1 to 1 forward. with 0.76 to I overdrive and 4.62 to 1 reverse.
The drive is carried to a Kirkstall worm-gear by means of Hardy Spicer propeller shafts. A ratio of 7.66 to 1 is used for the driving axle, which is mounted in conjunction with a Kirkstall trailing axle, both being carried on a Hendrickson rubber suspension rear bogie.
rel With the Hendrickson bogie. of course, there is no need for spring lubrication. The system aims to give greater articulation, thus increasing flexibility and keeping chassis distortion to a minimum. The rubber cushioning device that carries the load is arranged to give a progressive rate of springing.
Vacuum assisted Girling hydraulic braking is applied to all wheels, with a compensated hand brake operating on the four rear wheels. Facing sizes are 154 in. by 44 in. at the front and 154 in. by 6 in. at the rear. On this, as on the other
models, the steering is Marks cam an roller with 28.5 to 1 ratio.
+ Unladen weight of the chassis and cal is 4 tons 7 cwt. The axle weights a maximum legal loading are given a 4 tons front and 16 tons rear.
A Boalloy cab, giving a wide angle o vision, is employed. Standard equipmen includes such items as twin windscreei wipers, twin spot lamps, flashing traffi indicators and chromium-plated bumpers The cab roof, doors and engine cowlini are of glass-fibre.
Cab insulation and trimming an carried out in plastics-covered felt.
The air cleaners are placed above tilt radiator in a clean cold-air stream, acces: being provided by means of an easil3 detachable panel in the scuttle. A 25-gal fuel tank is fitted. From ground leve to the top of the cab the overall heigh is 8 ft. 6 in.
In conjunction with the Gardner 6LW oil engine the eight-wheeler employs the David Brown No. 557 gearbox, the drive being carried to a two-speed auxiliary gearbox and on to the Kirk-stall wormgear final axle, which has a 6.25 to I ratio. Gear ratios are 7.92, 4.68, 2.74, 1.565 and 1 to I forward and 7,92 to I reverse. The two-speed box has ratios of 1 and 0.727 to I.
Whilst the two-speed overdrive application is advised by the manufacturers for use with eight-wheelers operating solo, they suggest that where the vehicles are towing trailers the unit should be reversed to give an underdrive ratio that would enable the outfit to deal with the most severe gradients.
In. standard form the wheelbase is 18 ft., but others are available. Overall width is 7 ft. 4 in., length is 30 ft., and the measurement from the back of the cab to the end of the frame is 24 ft. 6 in. The frame is of ?f-in. channel, 11 in. deep with 3-in. flanges.
Seven full-depth box-ended crossmembers are incorporated. The distance from the ground to the frame top is 3 ft. 51 in.
The eight-wheeler rear bogie is of the four-spring design with off-centre rocking beams, all spring pins being fitted with Metalastik bonded steel bushes to minimize wear. Hendrickson rubber suspension can be supplied.
The design provides for air brakes throughout and for a hand brake working on the four rear wheels. In the front drums the facings are 161 in. by 4 in., and in the rear, 161 in. by 6 in.
Cab design is similar to that of the six-wheeler. A glass-fibre panel is fitted in the roof and the doors are made of similar material. The overall height to the top of the cab is 8 ft. 6 in. Unladen weight of chassis and cab is 61 tons. The standard fuel-tank capacity is 48 gal.
It is understood that eight-wheeled tippers with a similar specification are already in service with a legal carrying capacity of 164 tons and that satisfactory results are being obtained.
The TS3 engine is again employed in the tractor unit,. which has a 155-in, clutch and the David Brown No. 557 gearbox with similar ratios. to the eightwheeler. Wheelbase is 9 ft.. although shorter wheelbases are obtainable. Overall length is 13 ft.
From the rear of the cab to the centre of the turntable "the measurement is 6 ft. 4 in, and from ground level to the ■ top of the cab 8 ft. 4 in. For the frame, 8+-in. by 3-in, channels in. thick are used. The flange top is 3 ft. I in. above the ground.
Kirkstall worm axles have a ratio of 7.25 to I. Including the fifth-wheel • assembly, the unladen weight is 31 tons: Suspension consists of an orthodox spring-shackle layout with 11-in. pins. Hydraulic vacuumassisted brakes incorporate a vacuum connection to the semitrailer by means of a hydraulically operated sequence valve. To prevent the risk of jack-knifing the valves are adjusted so that the semi-trailer brakes operate before those of the tractor.
Cab and incidental equipment follow the same lines as on the other models, but provision is made for a full-width seat if required. As on the sik-wheeler, the fuel tank has a 25-gal. capacity. Flashing indicators are fitted, with an isolation switch in the electrical circuit.