K5V212 K5V212DT K5V212DTH 400101-00021 31EE-10010 Kawasaki Hydraulic Main Pump for Doosan DX500 Hyundai R500LC Vol.vo EC480 Excavator

We supply genuine-spec and high-performance aftermarket K5V212, K5V212DT, K5V212DTH, and K5V212DPH Kawasaki axial piston hydraulic main pump assemblies (OEM Part Numbers: 400101-00021, 400101-00022, 31EE-10010, 31EE-10020, 2401-9309, VOE 14595548). This 212cc variable displacement tandem swashplate piston main pump is direct-fit compatible with Kawasaki K5V212 systems widely operating on 45 to 55-ton mining excavators, including Doosan / Daewoo DX480 / DX500 / DX520 / Solar 500LC-V, Hyundai R480LC-9 / R500LC-7 / R520LC-9 / R455LC-7, Kobelco SK480-8 / SK500, Vol.vo EC480D / EC480E / EC500, and SANY SY485 / SY500. Manufactured to 350 bar continuous operating pressure, our hydraulic main pump assemblies provide high power density, precise dual-pump flow control, and extended service life under heavy quarry digging conditions.

• Heavy Mining & Quarry Excavation: Primary main hydraulic pump unit for 45–55 ton class heavy excavators equipped with 2.8–3.5 m³ rock digging buckets.
• Heavy Demolition & Crusher Attachments: Delivers rapid hydraulic regulator response to absorb sudden shock pressure loads from 5–6 ton hydraulic breaker hammers and pulverizers.
• Mass Earthmoving & Infrastructure Loading: Dual tandem piston pumps provide high combined flow rate for simultaneous boom lifting, arm crowding, and swing cycles.
• High Dust & High Ambient Temperature Jobsites: Heavy-duty iron pump casing and heat-treated valve plates resist internal oil fluid bypass and thermal pressure loss.

To assist site mechanics and hydraulic repair engineers in diagnosing pump failure, below is a troubleshooting reference for common K5V212 / K5V212DT hydraulic pump issues:

• Loss of Hydraulic Pressure & Weak Digging Output (Main Pump Wear): Caused by worn swashplate slipper pads, cylinder barrel face scuffing, or piston shoe clearance in K5V212 units on Doosan DX500 or Hyundai R500 excavators. Replacing the complete hydraulic pump assembly restores 350-bar digging force.
• Sluggish Boom, Arm, or Bucket Movement (Flow Response Lag): Frequently linked to sticking pump regulator spools (LS / TVC valves), worn swashplate feedback linkages, or low pilot control pressure.
• Abnormal Cavitation Knocking & Hydraulic Noise: Caused by air entering the main pump suction port, clogged hydraulic reservoir return filters, or worn drive shaft support bearings.
• Hydraulic Fluid Overheating & Rapid Power Fading: Caused by severe internal oil recirculation across worn valve plates inside the hydraulic pump casing during sustained summer operation.
• Extensive Hydraulic Leakage & Shaft Seal Failure: Triggered by hardened front shaft oil seals, degraded housing O-rings, or excessive drain line back-pressure.