by Kyle Molyneux | Fri 21 Feb 2020
New Cat trolley assist for electric mining trucks
The new Cat trolley assist system for Cat electric drive mining trucks is now available for mining operations seeking a means to reduce carbon emissions, lower fuel and engine costs, and boost speed-on-grade for greater productivity. The Cat trolley assist retrofit kit is currently available for the 795F AC truck, and the trolley design is compatible with the three other Cat electric-drive mining trucks—794 AC, 796 AC and 798 AC. The commercial introduction of Cat trolley assist comes at the conclusion of a nearly two-year pilot project conducted with four 795F AC trucks using 700 metres of electric trolley line at Boliden’s Aitik mine in Sweden.
The trolley system significantly reduces diesel engine emissions at the mine via substitution of electricity during the most demanding part of the truck work cycle. Powering a 337-mt-payload 795F AC via trolley on a 10% grade as it climbs the ramp out of the pit saves up to 40 litres of diesel fuel per kilometre of trolley line. Fuel and engine costs are reduced by more than 90% while the truck is on trolley.
Cat reckons its fully machine integrated trolley system can also boost productivity. Operating with trolley assist, speed-on-grade increases as much as 100% versus diesel-only mode. Using trolley, a loaded 795F can run at 28km/h (17mph) on a 10% physical grade with solid haul road conditions. Other advantages come from the rugged Cat pantograph, designed to deliver superior uptime and reduced repair costs. A quick-drop feature helps protect the overhead trolley lines.
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