PERKINS POWER IN DERBY DUMPER
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A NEW on/off road dumptruck featuring the Perkins V8.640 has been unveiled by the Derbyshire firm of Haulamatic.
Known as the 676, it replaces the existing 615 model with a nominal payload of 16.6 tonnes (16 tons 6cwt).
In place of the 8.8-Litre (537cu in) V8.540 Perkins engine fitted to the existing 615 dumper, the new 676 uses the new 10.5-Litre (640cuin) V8.640 announced by Perkins last year. Compared with the 540, the latest Perkins produces 26kW (35bhp) more with 160kW (215bhp) at 2,600rpm.
More significantly, the torque is 20 per cent higher.
The maximum figure is given as 658Nm (4851bft) which Haulamatic claims gives the 676 more flexibility at higher running speeds.
A 68kg (1501b) weight penalty is involved with the fitting of the V8.640 although the payload capacity has been increased to a nominal 16.6 tonnes (16 tons 6cwt) for a gross weight of 26.7 tonnes (26.3tons).
One of the significant design features of the Haulamatic is the provision of an unusually large radiator. _ Six rows of tubes make up a total of 8330sqcm (9sqft) while the radiator is higher and sits about 100mm (4in) further forward.
A five-speed fully automatic Allison gearbox is standard with the torque convertor operating on all ranges with a stall torque of 2.4 to 1.
With the 9.77 to 1 axle ratio, the 676 has a claimed top speed of 62km/h (38mph).
The bottom ratio of the Allison allows a 7km/h (4mph) maximum speed.
For running at higher speeds, an uprating in the tyre specification plus a 7.17/5.14 two-speed axle gives a top speed of 98kmih' (61mph) while retaining a 40 per cent gradeability.
Steering gear geometry has been revised to improve the efficiency of the Cam Gears power-assistance by anchoring the main assister ram lower in relation to the chassis frame. The rear bogie has a 20.3 tonne (20-ton) capacity with suspension by semi-elliptic leaf springs supporting rocking beams.