SBS120 Hydraulic Pump for E320C E320D E323D E321D Excavators The SBS120 hydraulic pump is a main hydraulic piston pump specifically designed for E320C, E320D, E323D, and E321D excavators. Compatible with part numbers 272-6955, 173-3381, 200-3366, and 244-8483. Common Failure Modes 1. Internal Wear & Excessive Internal Leakage Symptoms: Weak digging force and slow machine movements; performance degrades significantly after warming up. High hydraulic oil temperature, hot pump