Mining and construction equipment manufac- turer Komatsu Southern Africa has introduced its latest generation Komatsu 52,7-t wheel loader model, the WA600-6, into the local market.
Komatsu’s mining division GM Archie Seleka says, “The WA600-6 is a much more improved version of its predecessor, the 46-t WA600-3.”
The new machine offers improved productivity, lower fuel consumption, increased reliability and superior operator comfort. It is substantially more powerful and heavier than the previous model and is equipped as standard with a larger-capacity bucket.
The WA600-6 is equipped with a high-performance electronically controlled heavy- duty common rail fuel injection Komatsu ‘Ecot3’ SAA6D170E-5 diesel engine. The engine meets the latest international emission control requirements, including the US’s Environmental Protection Agency Tier III and the European Unions’ Stage 3A regulations.
In addition, it incorporates a range of important features, some of which are local firsts.
Seleka points out, “For example, being introduced for the first time into this market is a capa- bility that enables the operator to position the bucket in the improved position and angle to suit the specific loading conditions required.”
Using electronic pilot control levers, the operator can position the boom and bucket in the exact position and angle for the job in hand. “With the remote boom positioner, the highest and lowest position of the bucket can be set from the cab to match any truck body. Once the positioner is set, the bucket is smoothly stopped at the desired position with no shock. Further, the operator can set the bucket- digging angle to match ground conditions.
“These capabilities, enhance productivity, lower fuel consumption, reduce wear and tear and save costs,” adds Seleka.
Another new feature is a modulated clutch system, which controls the tractive effort with the left brake pedal from 100%, to 20% of the torque converter output.
“This is especially useful for smooth speed reduction when approaching dump trucks for loading, easy control of tyre slippage in sandy or muddy conditions, and reduction of shocks in shifting from forward to reverse,” comments Seleka.
The new Komatsu large-capacity lock-up torque converter provides increased production efficiency, faster cycle times and improved fuel savings in load-and-carry or hill-climb operations, while its rimpull at low speeds makes material penetration easier.
The advanced torque converter, combined with the full-powershift planetary-type transmission, delivers a forward travel speed of 37,7 km/h with lock-up clutch, and a reverse speed of 37 km/h. At the same time, the high-torque engine and large capacity torque converter allows low engine speed matching.
Among other productivity- enhancing and time- and cost-saving features incorporated in the new model is a dual- mode engine power select system. The dual mode comprises an E-Mode, which provides enhanced efficiency for general loading and load-and-carry on level ground, and a P-Mode, which provides enhanced power output for hard digging operations or hill climbing.
The variable displacement piston pumps, combined with the closed-centre load sensing system provide for precise control to deliver hydraulic flow as required by a job, preventing wasted hydraulic pressure. Further, the WA600-6 has the widest tread in its class, and the long wheel base provides improved machine stability in both longitudinal and lateral directions. The articulation angle is 43˚, permitting efficient operation even in the tightest job sites.
The engine fan of the new loader is driven hydraulically, with the speed of the fan being controlled by engine coolant temperature, hydraulic oil temperature, transmission oil temperature and air conditioning.