Focus on Wheel Loaders

Aggregates
January 12, 2010
By Aggregates
Kawasaki
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KCMA Corporation has introduced the new Kawasaki 92ZV-2 wheel loader. The 92ZV-2 is described as a strong 4.6 to 5.0 cu. m wheel loader that fills the gap between the high performance 90ZV-2 and the popular workhorse 95ZV-2. Applications said to be ideal for the 92ZV-2 include load-out applications in quarries or sand and gravel operations, hopper feeding in asphalt plants, fork applications handling pipe and pallets as well as non-construction applications. The 92ZV-2 is described as a complete solution featuring an emissions compliant 284 HP Cummins diesel engine with a 47 per cent torque rise providing great power for digging and hill climbing. The loader accepts a wide assortment of attachments to handle many jobs and a ride control option provides stable load handling. The 92ZV-2 has a single hydraulic control option for easy operation. Outboard mounted, dual circuit wet disc brakes deliver reliability and long service life while torque proportioning differentials provide longer tire life and less wheel spin. Wide front fenders with mud flaps are standard, as is autobrake which protects the transmission from overspeeding or improper directional shifting. The transmission has helical gears which reduce noise level and vibration. The automatic reversible cooling fan has manual override while the adjustable declutch allows the operator to adjust the declutch to various operating conditions. MODM (Machine Operation Diagnostic Module) provides essential operations and diagnostic information in an easy-to-read LCD display.



Liebherr
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Operating weight vs. tipping load
Many manufacturers place great emphasis on the registered operating weight for their wheel loader products, suggesting that the heavier the equipment, the greater its lifting capacity. Although one could argue that increasing the overall weight of the equipment could result in greater lifting ability, the only thing for certain is that fuel economy will be sacrificed, says Liebherr.

Liebherr emphasizes the consideration of a wheel loader’s tipping load as a much more critical factor. In fact, it is the tipping load that determines the proper bucket size, and by extension, the payload capacity for a given wheel loader. Further, the tipping load factor for a wheel loader can be increased by means other than simply increasing the overall operating weight of the equipment.

The Liebherr wheel loader offers equal to or better than, tipping load ratings, while maintaining significantly lower operating weights, resulting in increased productivity and reduced fuel consumption.

This is a direct result of the utilization of a hydrostatic driveline, and the advanced design of our wheel loader product, which places the Liebherr diesel engine and hydraulic pumps, the heaviest components, to the extreme rear of the machine where they act as natural ballast. As a result, the centre of gravity for a Liebherr wheel loader is located to the rear of the back tires, as opposed to torque converter designs whereby the centre of gravity will be much further forward due to the necessary configuration of a “hard line” drive system.

Better weight distribution, hydrostatic drive, reduced brake wear, reduced tire wear and reduced weight all add to reduced operating costs for Liebherr wheel loaders.



Volvo
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The Volvo L45F and Volvo L50F machines are recent additions to Volvo Construction Equipment (Volvo CE)’s F-Series range of wheel loaders. Fitting into the mid-sized class of machines, both wheel loaders are made for performance, with features that include the patented Torque Parallel (TP) loader linkage, separate working hydraulic pumps for maximum power, 100 per cent axle differential locks, the Volvo Care Cab, and long service intervals.

The Torque Parallel linkage on these loaders give smooth, parallel lift, high rollback torque and excellent lifting power throughout the lift range. A key element to any wheel loader is visibility, and the linkage on both machines provides class-leading pallet visibility, along with a clear view of
attachments.

Both models are equipped with separate power steering and load-sensing hydraulic pumps, while differential locks offer 100 per cent lock in both the front and rear axles to ensure synchronized tire spin for optimal traction even in difficult conditions.

Operator comfort
Operator comfort has been recognized with the Volvo Care Cab on the L45F and L50F machines delivering all-day operator comfort. Standard air conditioning includes automatic temperature control to suit the operator’s demands, while each cab is installed on fully viscous mounts for reduced noise and vibration and features best-in-class cab filtration system. Cab interiors are designed for fatigue-resisting ergonomic comfort, ensuring that the steering wheel, steering column, standard air suspension seat, armrest and levers can all be adjusted to match each operator. Controls and front-pillar mounted switches are all within easy reach and easy view.

Both loaders are powered by Tier three certified water-cooled turbo-charged Volvo D5 4.8 litre engines. The Volvo L50F engine also includes an air-to-air intercooler with both engines achieving high torque at low engine speeds. 

Fully hydrostatic transmissions allow smooth shifting and direction change under full load, prolonging the life of the brakes. A thermostatically controlled, 3-mode reversible hydraulic fan is available, automatically adjusting to reverse air flow and blow any material or debris out of the radiator.

Both L45F and Volvo L50F models are based on a heavy duty articulating frame concept. The front and rear frames are designed for maximum ground clearance, while high-quality steel throughout provides durability, increased stress resistance and operational stability. In addition, both machines are offered with optional Z-bar Volvo patented model attachment brackets. Rear axle oscillation increases machine stability, while low-maintenance features – like a heavy duty planetary axle and sealed, integrated oscillating bearings lubricated with the axle oil – increase machine uptime. Inboard wet-disc brakes improve reliability and safety.

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