Truck Parts and Service

February 2012

Truck Parts and Service | Heavy Duty Trucking, Aftermarket, Service Info

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Page 17 of 39

Technology Update By John G. Smith, Contributing Editor Hybrid Help I There's a new generation of equipment on the road, but ongoing maintenance may be easier than you think n an era of soaring fuel prices and ever-tightening emissions, hybrid trucks seem to off er the best of both worlds. Th e energy stored in their battery packs or hy- draulic accumulators already is being called on to power everything from PTOs to wheels, while traditional diesel engines still are sitting under the hood. But these emerging systems also present shops with new technologies to understand. Setting aside the components specifi c to individual manufacturers, today's versions of these trucks rely on hydraulic or electric power. Hydraulic versions, such as those adopted by several waste haulers, use 16 TRUCK PARTS & SERVICE | February 2012 the kinetic energy created by a brak- ing truck to drive a pump/motor. When working as a pump, this component transfers hydraulic fl uid from a low-pressure reservoir to a high-pressure accumulator. Stored energy in the accumulator can then be used to power the motor, helping the truck accelerate on its own or adding to the power of a combustion engine. In contrast, the electric hybrids that power a growing number of walk-in delivery vans or utility trucks have a generator and motor. Th e energy captured with the generator is stored in batteries that can be used to power the motor, which can help move the truck or drive a PTO for tools such as cherry pickers.

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