K3V112DT 4372038 9148333 Kawasaki Hydraulic Main Pump for Hitachi EX200-5 EX220-5 Excavator

We supply genuine-spec and heavy-duty aftermarket K3V112DT, K3V112, and K3V112DTP Kawasaki axial piston hydraulic main pump assemblies and double pump units (OEM Part Numbers: 4372038, 9148333, 4353381, 4372036, 9182390). This 112cc variable displacement swashplate tandem piston main pump with negative flow control regulators is direct-fit compatible with Kawasaki K3V112DT hydraulic systems deployed on 20 to 22-ton excavators, including Hitachi EX200-5, EX200-5 Super, EX210-5, EX220-5, ZX200-1, ZX210-1, and Kobelco SK200-5 / SK200-6. Built to 35 MPa (350 bar) continuous pressure specifications, our hydraulic main pumps feature high volumetric efficiency, steady pilot control responsiveness, and extended swashplate wear life in heavy digging operations.

Hydraulic Main Pump Applications & Working Environments

• 20-Ton Class Earthmoving & Excavation: Primary hydraulic main pump providing dual-circuit combined oil flow for 20-ton excavators during rapid trenching and loading.
• Quarrying & Demolition Breaker Operations: Heavy-duty swashplate and pilot regulator group absorb sudden hydraulic shock pressure loads from breaker hammers and shears.
• Foundation Digging & Slope Work: Maintains stable high-pressure output for continuous, simultaneous boom lifting, arm crowding, and bucket curling cycles.
• High-Temperature Summer Shifts: Precision-ground piston slippers and wear-resistant valve plates prevent internal oil bypass under prolonged ambient heat.

Hitachi EX200-5 / K3V112DT Hydraulic Pump Troubleshooting Guide

In machinery repair, over 90% of hydraulic system failures originate from main pump wear or regulator valve misadjustment. Below is a diagnostic guide for common Hitachi EX200-5 hydraulic pump faults:

• Weak Hydraulic Power & Low Digging Force ( Low Pressure): Frequently caused by worn swashplate slipper faces, cylinder barrel face scuffing, or piston shoe clearance in K3V112DT units on EX200-5 excavators. Replacing the hydraulic main pump eliminates slow boom lifting and bucket hesitation.
• Sluggish Boom/Arm Travel & Hydraulic Lag (Response Lag): Linked to sticking hydraulic regulator spools (negative flow control valves), worn swashplate feedback linkages, or low pilot control pressure.
• Abnormal Cavitation Knocking & Hydraulic Noise ( Cavitation Knocking): Caused by air entering the main pump suction line, restricted hydraulic reservoir return filters, or worn pump drive shaft support bearings.
• Hydraulic Oil Leakage & Flange Fluid Loss ( Failure): Triggered by blown main drive shaft oil seals, hardened housing O-rings, or high drain line back-pressure returning to the reservoir.
• Overheating Hydraulic Oil & Rapid Thermal Power Drop (Overheating): Caused by severe internal fluid bypass across a worn valve plate inside the K3V112DT pump casing during extended operating shifts.

Frequently Asked Questions 

Q1: Is the Kawasaki K3V112DT hydraulic main pump directly compatible with Hitachi EX200-5 excavators?

A: Yes. The K3V112DT hydraulic main pump assembly matches OEM mounting flange bolt circles, drive shaft splines (14T / 17T options), and hydraulic regulator hose ports. It is 100% direct-fit compatible with Hitachi EX200-5, EX200-5 Super, and EX220-5 excavators.

Q2: What are the primary OEM part numbers for the Hitachi EX200-5 K3V112DT hydraulic main pump?

A: Common OEM cross-reference part numbers include 4372038, 9148333, 4353381, 4372036, and 9182390.

Q3: What are the main signs that my EX200-5 hydraulic pump needs a complete replacement instead of a seal kit?

A: If your machine experiences universal hydraulic power loss across all functions, fine metal shavings in the hydraulic return filter, or rapid fluid heating within 30 minutes of operation, internal piston block or barrel damage has occurred, requiring a complete main pump assembly replacement.

Hitachi EX200-5 Hydraulic Main Pump & Machinery Components Cross-Reference