Focus on Wheel Loaders

Caterpiller, Case Construction Equipment...
Aggregates & Roadbuilding Staff
January 02, 2009
By Aggregates & Roadbuilding Staff
Case Construction Equipment
With an operating weight of 30 tonnes and a standard payload capacity of 5.7 m3, the Case 1221E wheel loader is said to be ideally suited for sand and gravel, stone and aggregates, roads and bridges and site preparation applications. The 1221E is powered by a fully electronic, six-cylinder Tier III-certified Cummins engine that delivers 320 net hp (239 kW) at maximum performance. Additional features include a spacious cab offering greater operator comfort and visibility, and easy maintenance for more productive hours on the job. The large, isolation-mounted cab on the 1221E is reportedly among the quietest in the industry, with an operator sound level of 72 dB(A). Maximum operator adjustments increase operator comfort, productivity and visibility. Floor-to-ceiling glass in the front, along with a sloped rear engine compartment, gives the operator maximum visibility both forward and to the rear, a clear, direct view to the front tires, the bucket edge and the work site. All the controls are at the operator’s fingertips with the standard single-lever joystick loader control with forward-neutral-reverse quick shuttle switch and transmission downshift button. A digital display records real-time data, shows diagnostic information and allows programming of operational modes.

For ease of maintenance, fluid sight gauges are positioned at eye level. Three remote drains for coolant, engine and hydraulic oil provide convenient access for fast, environmentally friendly fluid changes. An option on the 1221E, Ride Control™ provides improved productivity through excellent material retention while reducing shock loads on the machine and operator. Ride Control can be set for full-time mode or in auto mode which activates above 10 km/h. The 1221E also features limited-slip axles on the front and rear to automatically transfer power from a wheel that’s slipping to one that’s gripping, providing traction for efficient working in any type of ground condition. Outboard planetary and wet-disc brakes provide machine stability because the weight is outside the machine’s frame.

The 1221E is available in traditional Z-bar and extended reach (XR) linkage configurations. The Z-bar linkage equipped 1221E provides high production, fast cycles, optimized operating loads and good bucket visibility.

For applications requiring higher dump clearance, such as loading materials into high sided trucks, the extended reach loader linkage configuration is available on all Case full-sized wheel loader models from the 521E to the 1221E and delivers extended reach throughout the complete cycle as well as extended dump clearances. An optional XT tool carrier linkage configuration is also available on the 521E, 621E and 721E wheel loaders. The XT configuration offers a true parallel lift throughout the complete cycle, so the operator can concentrate on moving materials rather than making adjustments to level the load.

Ranging in horsepower from 135 to 320 net hp (101 to 239 kW), the Case E Series full-sized wheel loaders include the 521E, 521E/XR, 521E/XT, 621E, 621E/XT, 621E/XR, 721E, 721E/XR, 721E/XT, 821E, 821E/XR, 921E, 921E/XR, 1221E and 1221E/XR. Case also offers a full line of compact wheel loaders.

The Caterpillar 992K Wheel Loader replaces the 992G with features said to enhance productivity, operator efficiency and safety, serviceability and durability. The loader efficiently matches with the Caterpillar 777 and 775 off-highway trucks and delivers fast cycles and high bucket fill factors for productive truck loading. The 992K features the Cat C32 ACERTTM engine for increased performance and US EPA Tier 2 and EU Stage IIa emissions compliance, producing net power of 801 hp (597 kW). The same engine powers the 993K loader, 777F truck and D11T tractor, which effectively reduces inventory needs. Also boosting productivity is Positive Flow Control (PFC) hydraulics—the next generation of load-sensing hydraulics. Additional sensors at the pumps provide enhanced responsiveness that the operator can feel and use.

 The 992K also offers innovative solutions to ease maintenance and boost reliability. For example, the Cat exclusive sleeve bearing pins eliminate the need for daily greasing of the front linkage, and the next generation modular radiator (NGMR) has copper fins for superior heat exchange capabilities. The design and construction minimize space required for the cooling package and allow enhanced sight lines to the rear.

Additionally, centralized service centers and ground level access points including the bumper service center and optional fluid service center speed service and reduce exposure to falls. The VIMS machine health monitoring system aids technician when needed. The loader design also emphasizes operator safety and comfort. A trainer seat is standard equipment. The optional rear view camera increases the view behind the machine as do optional, heated rear view mirrors.

John Deere
John Deere’s K-series loaders offer customers cab redesign,a new utility-sized loader and Tier 3 emissions certification to the largest models. The K-Series includes eight updated models and a new member of the family, the 2.1m3 524K, a utility-sized unit not previously offered. All K-Series loaders, covering the 1.5 m3 to 6.1 m3 range, will have a thoroughly redesigned cab that increases operator comfort and visibility. Shift pedals have been moved forward and the front console size reduced to provide extra room in the cab. A new, streamlined steering column and front windshield configuration provide more visibility than ever before while cab noise has also been decreased. All K-Series 4WD loaders include keyless start, seat-mounted controls, expanded sealed switch module and a new LCD monitor with a multi-function interface. Additionally, the 544K through 844K will now have joystick steering available.

The LCD monitor provides screen displays of machine parameters, an operator check sheet, real-time fuel usage, extensive diagnostics and a payload weighing screen. An embedded John Deere payload weighing scale is powered by industry leader Loadrite. The optional rear obstacle detection system provides an alert if any object is in the loader’s direct path while backing up. It is combined with a rear-camera which displays through the LCD monitor above for increased awareness, especially in high-traffic areas or close-quarter working conditions. A diagnostic menu on monitors is said to allow technicians to get information quickly and from one place without hooking up a laptop or using gauges in most cases. It is also said to put the operator in a much better position to increase uptime by keeping a close watch on speeds, pressures and operating temperatures and by effectively communicating to the shop or dealer on issues to minimize trips to the machine due to incorrect tools or parts.

With John Deere PowerTech Tier 3 engines added to the 724K through 844K models, K-Series 4WD loaders from the 444K and up are now Tier 3 certified. Deere PowerTech engines are said to be fuel efficient and provide strong horsepower and torque for all applications. The 444K through the 844K are now equipped with Deere’s exclusive Quad Cool system. This system places the radiator, transmission, hydraulic and air-to-air coolers in a separate compartment for exceptional efficiency and decreased debris build-up. An optional reversing fan automatically back-blows every 30 minutes to help keep the cores clean. The 644K now has Deere’s exclusive Powerllel Linkage, which delivers both powerful digging forces and parallel lift, while 544K through 844K models are fitted with NeverGrease Pins. These pins have an exclusive sealed design that never needs greasing, leading to significant cost and time savings.

Komatsu America Corp. has introduced the WA320PZ-6 Wheel Loader, said to offer improved visibility and increased loading power and performance for the construction, utility, government, sewer, waste and agricultural markets.  Replacing the WA320PT-5, this new machine includes significant technological enhancements for greater performance, operator comfort and efficiency.

With an operating weight of 14.7 tonnes to 15.4 tonnes and a heaped bucket capacity of 2.5m3 to 2.7m3, the WA320PZ-6 is powered by a Komatsu SAA6D107E-1 engine. This engine, with a net horsepower of 167 hp, is EPA Tier 3 emissions certified and provides high productivity with low fuel consumption and low noise.

The WA320PZ-6 is equipped with the latest KOMTRAX® technology which sends machine operating information to a secure website utilizing wireless technology.  Data such as operating hours, location and maintenance alerts are relayed to the web application for analysis.  The KOMTRAX fleet monitoring system increases machine availability, reduces the risk of machine theft, allows for remote diagnosis by the distributor and provides a wealth of other information to drive business efficiency and productivity.

Features of the new WA320PZ-6 include a new parallel linkage design, improving visibility for operations such as loading pallets and other materials onto forks.  The WA320PZ-6 also provides parallel movement with large tilt force for both bucket and fork applications. In addition, the WA320PZ-6 incorporates Komatsu’s Hydrostatic Transmission System (HST) that allocates only as much power as is needed for a given application. The engine power is transmitted hydraulically to a transfer case, then mechanically out to the differentials and to the four driving wheels, allowing the WA320PZ-6 to respond quickly and smoothly to varying job conditions.  By adjusting automatically to the tractive effort demands of the work at hand, Komatsu’s HST provides for quick travel response and aggressive drive into the pile.  The full auto-shifting feature eliminates gear shifting and the kick-down switch gives the operator the ability to concentrate on digging and loading operations for faster cycle times and increased productivity. The WA320PZ-6 also has Variable Traction Control With “S-mode”. When travelling at low speeds, the tractive effort of the machine can be reduced by using the traction control switch to control tire slippage, a beneficial feature on surfaces such as wet concrete or soft ground.  The traction control system, which extends the life-cycle of tires and improves work efficiency, eliminates excessive bucket penetration and tire slippage during operations such as stockpile loading.  By controlling the engine speed and HST motor when traveling at a low speed, the new “S-mode” control provides optimum driving force for operations on slippery road surfaces, including snow removal or working on snow-covered surfaces.
The WA320PZ-6 also has an excellent breakout force of 14,433 kg and high static tipping loads (10,993 kg straight and 9,673 kg at a 40 degree full turn) to provide superior power and stability during the toughest operations.  The long lift arms provide high dumping clearances and maximum dumping reach so the operator can easily “level” or “even” loads on the body of a dump truck.

Komatsu’s operator-friendly cab has increased backwards seat slide adjustment and interior room. The pressurized cab reduces noise levels to a low 70 db(A) and keeps dust and other particles from the cab’s interior.  The rear-hinged cab doors and sloped staircase-type steps with large diameter handrails allow for easy entrance and exit while the wide pillar-less glass windshield provides maximum visibility.  The viscous damping mount system helps minimize noise, as well as shock and vibration in rough working conditions. For optimum comfort, the WA320PZ-6 features a low effort, multi-function mono lever Pressure Proportional Control (PPC) hydraulic system with a forward, neutral and reverse control switch for smooth and easy directional changes.  There is also a max traction switch on the mono lever to cut turn traction control on and off easily with the push of a button.

The WA320PZ-6 allows for easy maintenance which reduces costly downtime.  The large gull-wing type doors open widely and easily (with the assistance of a gas spring) allowing the operator or technician to perform daily service checks from the ground.  The engine fan is hydraulically driven and if the machine is operating in adverse conditions the operator can reverse the hydraulic cooling fan (to blow out debris) from inside the cab by simply pressing a button on the control panel. Or, the fan can be preset to automatically activate at given intervals.

The wheel loader is equipped with the exclusive Komatsu EMMS Equipment Management Monitoring System (EMMS) which monitors all critical systems, alerting and guiding the operator should an abnormality occur.  Komatsu’s EMMS can prevent a small problem from becoming a major service issue.  The controller monitors key engine features such as oil pressure, coolant temperature air cleaner clogging, etc.  If the controller finds abnormalities, the error is displayed on the LCD.  The EMMS also stores abnormalities and error codes for troubleshooting assistance for mechanics to minimize diagnostic and repair time.

The WA320PZ-6 also promises increased durability and reliability. Its wet multi-disc brakes and fully hydraulic braking system, combined with dynamic braking, lower maintenance costs and provide higher reliability.  The dynamic braking function means wet disc brakes aren’t used as often, increasing overall brake disc life.  The wet disc brakes are fully sealed keeping contaminants out, reducing wear and subsequent maintenance.  This also means no air system to bleed and no condensation of water that can lead to corrosion and freezing. Highly reliable and exclusively designed electronic components such as controllers, connectors, sensors and wiring have undergone extensive testing to ensure reliability in the harshest of conditions.  The DT-type electronic connectors seal against dirt and moisture.  Flat face-to-face O-ring seals are used to securely seal hydraulic hose connections and all hydraulic cylinders are protected by metal guard rings for additional reliability.

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