Two ERFs for 44-tons at Glasgow Show
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• ERF exhibits at the Scottish Motor Show will include a 6 x 4 tractive unit designed to operate at 44 tons gross combination weight. It will have a Cummins NTK 270 14-litre turbocharged diesel which has a maximum gross output of 270 bhp at 2,100 rpm with maximum gross torque of 750 lb.ft. at 1,550 rpm and the drive will be through a Lipe-Rollway 15.5in. twin-plate clutch to a Fuller twin countershaft -RTO 909A nine-speed overdrive gearbox.
Like other 44-ton tractors that are due to make their first appearance at the Scottish Show, the new ERF is built in anticipation of a change in Construction and Use Regulations that will permit higher gross weights. There is much speculation in the industry on what a future limit will be and it is by no means certain that a figure in excess of 40 tons will be allowed in the foreseeable future. But with 270 bhp the ERF meets the figure of 6 bhp per ton at 44 tons gross which is now generalk: accepted as the minimum requirement in Europe although in Germany the figure will be increased to 8 bhp per ton as a legal requirement in 1972.
The rear axles of the new ERF, which is esignated 66 (CU)270 T, have a capacity of 10 tons each although the two-spring uspension is rated for 18 tons and this limits he bogie load to this figure. The bogie is a Kirkstall Type D100 HB, this being the first se by ERF of the new Kirkstall design. The
.riving heads have singleelical-and-spiral-bevel double reduction
giving an overall ratio of 6.264 to 1 and the inter-axle differential is lockable.
The frame of the six-wheeler measures 12.125in. by 3.5in. by 0.3125in. Hydraulic power steering is employed and braking is by a full air system with 15.5in. by 7in. brakes at the front and 15.5in. by Bin. at the rear, in all cases with cam actuation. The system provides for the required and secondary parking brake efficiencies with spring brakes on both rear axles. Tyre equipment consists of 10.00-20 .16-ply all round which make a limit for plating of 6 tons on the front axle.
With the transmission layout as in this first example, maximum road speed is 54 mph and with the extra low bottom gear of 8.7.6 to 1 in the Fuller 909 gearbox, a gradient of 1 in 4.5 can be climbed at the maximum gross weight.
While the Cummins engine tractor will be featured inside Kelvin Hall, ERF will have a similar 44-ton c.g.w. vehicle but with Rolls-Royce Eagle 12.17 litre turbocharged engine in the Demonstration Park. Except for the engine this example will have an identical specification to the one inside the hall and will have the same performance characteristics. The Eagle turbocharged engine gives 265 bhp gross at 2,100 rpm and 705 lb.ft. torque at 1,400 rpm.
Other exhibits in Scotland will consist of a 30/32-ton tractive unit with Gardner 6LX8 engine, Darix-speed gearbox and Kirkstall rear axle and a 16-ton-gross four-wheeler with Gardner 5LW engine, David Brown five-speed gearbox and Eaton two-speed rear axle.