A: A distinct metallic rattling noise from the pump casing, persistent foaming inside the hydraulic tank, and jerky cylinder movements confirm cavitation damage on the valve plate.
A: Filling the pump case with clean oil provides immediate lubrication to the pistons, shoes, and swashplate during startup, preventing instant metal galling and structural failure.
A: Check that the factory tag displays part 31M9-10030. This structural assembly is calibrated for Hyundai R55-9, R60CR-9, and R55-7 hydraulic configurations.
A: Equipped with premium hardened steel pistons, the pump sustains high working pressures without pressure fade, ensuring steady breakout power when cutting through heavy materials.
Q: What quality options are available?
A: We provide original, OEM, and high-quality aftermarket versions with stable supply capability.
Q:Why Choose RITO?
A:Listed Factory
Stable&Reliable Quality
OEM Factory for Chinese Top Excavator Brands
Supplier to Fortune 500 Companies






















