Komatsu America has launched the WA320-6 wheel loader, featuring a hydrostatic transmission, traction control, and an upgraded cab.
Replacing the WA320-5, the WA320-6 has an operating weight of 31,590 to 32,070 lb (14,329 to 14,547 kg) and a heaped bucket capacity of 3.0 to 4.2 yd³ (2.3 to 3.2 m³). It is powered by a 6.7-L turbocharged Komatsu SAA6D107E-1 engine that is certified to U.S. EPA Tier 3 and EU Stage 3A emissions standards, and delivers 167 net hp (125 kW) at 2000 rpm. The hydraulically-driven engine cooling fan can be reversed to blow out debris when operating in adverse conditions, or it can be automatically activated at scheduled intervals.
Power needed for a given application is allocated via Komatsu’s electronically controlled hydrostatic transmission system (HST) with variable shift control. The one-pump, two-motor HST transmits engine power hydraulically to a transfer case, then mechanically out to the differentials and the four driving wheels. By adjusting automatically to the tractive effort demands of the work at hand, the HST provides for quick travel response and aggressive drive into the pile.
Under deceleration, the HST also acts as a dynamic brake on the mechanical drive system. The loader also features fully sealed wet multi-disc brakes and a fully hydraulic braking system. A dynamic braking function helps to minimize use of the wet disc brakes, increasing overall brake disc life.
A 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. Machine speed can be adjusted using the loader’s variable shift control system.
When traveling at low speeds, tire slippage can be controlled by reducing the machine’s tractive effort with a traction control switch. The traction control system eliminates excessive bucket penetration and tire slippage during operations such as stockpile loading, which helps to improve work efficiency and extend the life cycle of tires. A new S-mode control provides optimum driving force for operations on slippery road surfaces by controlling the engine speed and HST motor when traveling at a low speed.
The WA320-6 provides a breakout force of 29,060 lb (129 kN) and high static tipping loads of 27,635 lb (12,535 kg) on the straight and 24,560 lb (11,140 kg) on a 40° full turn. The new wheel loader has an operating mass of 31,590 to 32,070 lb (14,330 to 14,547 kg).
Cab design incorporates pressurization to reduce noise levels to a low 70 dB and suppress dust and debris in the operator’s workspace, and a viscous damping mount system to help minimize noise, shock, and vibration in rough working conditions. The cab also features increased backward seat slide adjustment and more interior room than in the predecessor model. Smooth directional changes are made possible by a low-effort, electronically controlled directional lever.
Large gull-wing type doors open with the assistance of a gas spring to allow ready access for daily service checks from the ground. DT-type electronic connectors are sealed against dirt and moisture, and hydraulic hose connections are sealed securely with flat face-to-face O-ring seals. For additional reliability, all hydraulic cylinders are protected by metal guard rings.
The WA320-6 is also equipped with Komatsu’s equipment management monitoring system, which monitors critical systems and alerts the operator when action is needed. The controller monitors key engine features and displays any abnormalities on an LCD screen, and tracks abnormalities and error codes for troubleshooting and future analysis. Komatsu’s latest Komtrax technology allows the loader to send machine operating information to a secure website utilizing wireless technology.