Second new Guy
Page 54
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IN ADDITION to the eight-wheeler. Guy will have at Earls Court a second chassis designed for a gross weight above the current maximum in Great Britain. This is a new addition to the Big J range being a two-axle tractive unit with 9ft 6in. wheelbase and designed for 34 tons gross combination weight. The chassis has a Rolls-Royce Eagle Mk II, 265 bhp (BS gross) turbocharged diesel engine which gives its maximum output at 2100 rpm and a maximum torque of 740 lb ft (BS gross) at 1450 rpm. The chassis has a similar clutch to the eight-wheeler but the drive is through a Fuller RT0910 10-speed constant mesh gearbox which gives ratios of 6.5, 5.1, 4.04, 3.2, 2.59, 2.04, 1.59, 1.26, 1 and 0.8 to 1 forward and reverse of 7.06 to 1 and 2.21 to 1. The rear axle is a Guy hub reduction with 10-ton capacity and the front axle is the same as fitted on the eight-wheeler with a capacity of 6.5 tons and plated for 6 tons. In common with the eight-wheeler, front and rear brakes are 15.5in. by 7in. recirculatory ball, power-assisted steering is fitted and spring brake actuators provide for parking and secondary functions as well as the main service brakes. Tyre equipment on this vehicle is 10.00-20. A feature of the braking system is that both the main and secondary brake circuits to the driving axle incorporate load sensing so that with either braking effort at the driving wheels is proportionate to the load applied. Guy is the first manufacturer to provide twin load sensing and because spring brakes are used for the secondary application the action of the load sensing valve is different from that in the service line. When there is a reduced load on the driving axle air is fed into the actuators, the spring effort therefore being reduced in an inverse proportion to the actual load. Exhaust and intake systems follow the same pattern as on the eight-wheeler but because the turbocharger on the Rolls-Royce engine is fitted in the opposite way as compared with that on the Cummins, the exhaust is on the left and the intake on the right-hand side.