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Kubota Tractor Corp.

The R20 Super Series Wheel Loaders, the R420S and R520S, are powered by Kubota's E-TVCS three- and four-cylinder diesel engines, with horsepower ratings of 43 and 49, respectively. These engines are equipped with a dual-element air cleaner to protect the engine from dirt. The R420S produces a maximum bucket breakout force of 6,550 pounds and the R520S breakout force is rated at 7,424 pounds. Load Sensing Transmission automatically changes load handling from high speed/low torque to low speed/high torque when load conditions vary. The wheel loaders maneuver in tight spaces with 40 degrees of articulation and 8 degrees of frame oscillation. Four-wheel drive and limited slip differential power the machines through rough terrain. A new factory installed cab offers a fully adjustable suspension seat and vent system with heater. Both models utilize a new engine mount design, helical gear and an F-shaped fan that reduces noise and vibration. Standards features include: front and rear auxiliary hydraulic systems; front valve and control lever for attachments; clutch-less electric shuttle shifting; and a parallel circuit system for simultaneous operation between lifting and bucket operations. Circle No. 121

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Title Annotation:Wheel Loaders
Publication:Underground Construction
Date:Nov 1, 2003
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