Hydraulic Main Piston Pump 504-5477 469-4091 for E336D2 Excavator

This hydraulic main piston pump is the core power component of the excavator hydraulic system, designed for compatibility with the E336D2. It supplies pressure oil to drive the boom, arm, bucket, and travel functions. Manufactured with precise machining, it delivers stable output pressure and excellent wear resistance, making it an ideal choice for machine overhaul and replacement. Interchange part number: 504-5477.

The following symptoms typically indicate that the main piston pump requires inspection or replacement:

• Weak digging force and slow working speed
• Abnormal noise and vibration during operation
• Internal wear leading to pressure drop
• Oil leakage at the pump assembly sealing surface
• Unstable hydraulic flow and action jitter

To ensure correct fitment and reliable performance, please observe the following before ordering and installation:

• Verify the machine model before placing your order
• Confirm the part number matches your old pump
• Keep hydraulic oil clean during installation
• Replace the sealing kit together if necessary