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Liebherr Nenzing Crane Co. is now offering an auxiliary power unit (APU) on all its LR series lift cranes to power the air conditioning. The APU allows the operator to turn off the engine and still stay cool. It saves the crane owner money on fuel, service costs and residual value. The fuel saving can be estimated at 4 gallons (16 litres) per hour that it takes to run an average crawler crane engine on idle. Conservatively assuming a crane is run idle for 50% of the time, that is approximately 4,000 gallons (16,000 litres) a year. Similarly, with operating hours halved, service intervals are lengthened and the amount of maintenance required is halved. This reduces costs further and also cuts the downtime. Liebherr Nenzing crawler cranes use 270kW or 450kW (362hp/600hp) diesel engines, depending on model. The APU is a small 11kW (15hp) Hatz diesel motor – more than ample to power the air conditioning. The APU is integrated into the machinery house, designed into the machine, and secure from the possibility of damage.