Hydraulic Main Piston Pump 434-8188 322-8733 for E336D 340D Excavator

This hydraulic main piston pump is the core power component of the excavator hydraulic system, compatible with the E336D and 340D models. It supplies pressure oil for boom, arm, bucket, and travel movements. Manufactured with precise machining, it delivers stable output pressure and excellent wear resistance, making it an ideal choice for machine overhaul and replacement.

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 during installation:

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