Hitachi 9150726 hydraulic pump for Hitachi EX200-5 EX210-5 EX220-5 EX230-5 construction equipment
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Component: Main Hydraulic Axial Piston Pump Assembly
Pump Model: Hitachi / Kawasaki HPV102 Series
OEM Part Numbers: 9150726, 9152668, 9151945, 9155142
Machine Compatibility:
Hitachi EX200-5 / EX200LC-5
Hitachi EX210-5 / EX210LC-5
Hitachi EX220-5 / EX220LC-5
Hitachi EX230-5 / EX230LC-5
Condition: High-Quality Premium Aftermarket New (Complete Drop-In Unit)
2. Technical Specifications
Pump Type: Variable Displacement Tandem Swash Plate Axial Piston Pump
Flow & Pressure Control: Features dual hydraulic regulators to automatically manage engine power distribution and main relief pressures (up to 34.3 MPa / 343 bar).
Drive Setup: Heavy-duty input spline shaft designed to couple directly with the excavator engine flywheel dampener.
Auxiliary Pilot Gear Pump: Includes integrated pilot gear pump to deliver pilot control circuit pressure.
3. Critical Installation Requirements
Hydraulic Case Priming (Mandatory)
Before starting the engine, manually fill the main pump casing with clean, fresh hydraulic fluid through the highest case drain port. Running an axial piston pump dry for even a few seconds will destroy the valve plates, swash plate, and piston slippers.
Complete Hydraulic System Flushing
If replacing a pump that suffered internal mechanical failure, you must drain and clean the hydraulic tank, flush the main lines and control valve, and replace all suction and return filters. Metallic debris remaining in the system will destroy the new pump.
Verify Pilot Line & Regulator Settings
Ensure pilot control pressure lines and regulator sense lines are connected correctly. Double-check that pilot pressure matches factory specs (typically 3.9–4.4 MPa) before attempting full-load operation.
Initial Startup Air Bleeding
After installing and pre-filling the pump, crack open the air bleed plugs on top of the pump housing while cranking the engine with fuel cut off until clear, bubble-free fluid emerges. Bleed trapped air to prevent cavitation.
4. Frequently Asked Questions (FAQ)
Q: Are part numbers 9150726, 9152668, 9151945, and 9155142 fully interchangeable?
A: Yes. These numbers represent standard Hitachi factory revisions, regulator tweaks, and production updates for the Dash-5 series excavators using the HPV102 platform.
Q: My EX200-5 stalls the engine when under heavy digging load. Is the main pump at fault?
A: Engine stalling under load usually indicates a sticking pump regulator or faulty proportional valve failing to destroke the pump when hydraulic demand exceeds engine output power.
Q: Is this pump supplied complete with the regulators and pilot pump attached?
A: Yes. The unit comes fully assembled with dual hydraulic regulators, input drive shaft, and the auxiliary pilot gear pump attached and pre-tested.
5. Shipping & Logistics
Packaging: Coated with rust-inhibiting storage oil, sealed with heavy-duty port plugs, and bolted inside an export-safe wooden crate.
Transit Time: Global express air freight via DHL/FedEx/UPS typically delivers within 3 to 7 business days directly to your workshop or job site.