1998-2003 CATERPILLAR 988K WHEEL LOADER

Technical Description

The Caterpillar 988K Wheel Loader is a high-performance, large-capacity machine engineered for demanding material handling applications. Powered by a Cat C18 ACERT engine, it delivers 541 hp (403 kW) net power and 580 hp (433 kW) gross power, with peak torque of 2104 lb-ft at 1,200 rpm and a torque rise of 58%. The engine meets U.S. EPA Tier 4 Final and EU Stage IV emissions standards. The loader features a Cat planetary power shift transmission, offering multiple forward and reverse speeds for efficient operation. Its hydraulic system uses EH-positive flow control with flow sharing, providing a maximum flow of 153 gal/min (579 L/min) and a relief valve setting of 4757 psi for lift/tilt. Steering is pilot-operated, load-sensing, with a total steering angle of up to 86° and cycle times of 3.4 seconds at high idle. The operating weight ranges from 112,574 to 139,920 lbs (51,063 to 63,467 kg), depending on configuration, with a bucket capacity range of 4.7–13 m³ (6.2–17 yd³). Standard service refill capacities include 188 gal (712 L) fuel, 31.7 gal (117 L) cooling system, and 125.5 gal (473 L) hydraulic system fill. The 988K is built for durability, versatility, and productivity in heavy-duty environments.