Excavator [Ruston R-4]
Ruston-Hornsby Limited, Manufacturer
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The bottom frame is of steel construction with British section beams securely cleated together at the ends and braced by heavy corner gusset plates on the top flanges.
The tracks are of all steel construction and consist of a number of steel castings each of which forms a combined link and track pad. These castings, known as track links, are each of sufficient strength to carry the maximum wheel load. The links are connected together by 3% nickel steel pins thus forming 2 endless bands, each driven at one end by a heavy steel sprocket wheel, the intermediate links being supported on each side by 2 large diameter cast steel idler wheels carried on 2 "H" section cast steel axles, running under, and bolted to the bottom frame. Both tracks can be driven in either a forward or backward direction; and for steering, either track can be locked stationary by means of jaw clutches. The large bearing surface of the track links enables roads to be traversed without damage to the road surface.
The travelling power is transmitted from the engine through reversing dry plate clutches, friction fibre lined, and by machine-cut cast steel spur gears to the centre post shaft; thence from the bottom of the centre post shaft by machine-cut cast steel bevel wheels to a transverse shaft directly over the back axle. This transverse shaft is fitted at either end with double-ended jaw clutches which can either lock the caterpillar stationary or engage it at travelling speed. The final drive to the back axle is by machine-cut cast steel spur wheels.
The whole of the gearing on the bottom frame is totally enclosed. The machine is fitted with 2-speed travelling gear, giving slow speed for working conditions and high speed for road travelling.
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