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Tier 4 Interim engine marks Cat K Series small wheel loaders

The new Cat K Series small wheel loaders—924K, 930K and 938K—are redesigned to incorporate new engines that meet Stage IIIB/Tier 4 Interim emissions standards as well as significant new features that deliver enhanced performance, fuel efficiency and operator comfort. Among the new features are an efficient, electronically controlled hydrostatic drive system, new Optimized Z-bar loader linkage, refined operator's station and a choice of couplers and buckets for best matching the machine to the application. Predecessor H-Series models—924H, 924Hz, 928Hz, 930H, 938H and IT938H—will be available in markets having lesser fuel quality and less-stringent emissions standards.

The Cat C6.6 ACERT engine powers the three new K-Series wheel loaders and works efficiently with the machines to deliver fuel savings up to 30 percent, compared with H-Series models. Emissions-control technology includes a diesel particulate filter that automatically regenerates (burns away collected particulates) without interrupting normal operation. The C6.6 engine's rated speed setting of 1,800 rpm—compared with 2,415 rpm for the H-Series—contributes significantly to reduced fuel consumption, lowered sound levels, and reduced wear. An engine-idle shutdown system further reduces fuel consumption.

K-Series models are equipped with a step-less, four-range, hydrostatic drive system that allows independent control of ground and engine speed for efficient operation of hydraulically powered work tools. A new creeper control feature further improves low-speed operations by allowing the operator to adjusted maximum ground speed down to 1 mph. An operator-controlled, rimpull-control system helps reduce wheel spin and consequent tire wear, while a front differential lock enhances traction.

The dedicated load-sensing, variable-displacement pumps for the implement and steering systems reduce horsepower draw for fuel efficiency and improve multifunction performance. The new K-Series loaders also incorporate an electronic snubbing feature at end-stroke and kick-out positions to reduce operating stress. Hydraulic-filter service intervals are extended to 2,000 hours.

Optimized Z-bar loader linkage blends the breakout power of Z-bar linkage with the parallel-lift and load-handling characteristics of Cat VersaLink or IT (Integrated Toolcarrier) linkage. The new linkage, available in both standard- and high-lift configurations, accepts pin-on tools, Cat Fusion coupler or an ISO coupler (North America) that is compatible with competitive work tools. The new linkage is designed to work with Cat Performance Series buckets, designed for efficient loading, high fill factors, improved material retention and lowered fuel consumption.

An all-new operator's station features automatic temperature control, curved front windshield, heated rear window with intermittent wiper, and a Soft Touch control panel. The electronic joystick for implement control is seat-mounted, adjustable and incorporates integral controls for auxiliary hydraulics, directional shifting and differential lock. In-cab sound levels are reduced to 66 dB (A), down from 74 dB (A) in the H-Series models.

Kick-out functions for boom lift, boom lower and tilt are standard and easily programmable by pushing and holding a button on the Soft Touch panel. An electronic parking brake simplifies operation, and an optional Secondary Display shows vital machine information graphically and digitally as well as machine diagnostics. The Display works in conjunction with the soft touch panel to provide real-time adjustments for third function flow, throttle lock, rimpull control, and creeper control. The display also serves as a display for an optional rear-view camera system. Heated and cooled seats are available for optimal operator comfort.   www.caterpillar.com