708-2L-00300 hidrauliskais sūknis paredzēts Komatsu PC200-7 PC200LC-7 PC210-7 PC220-7 PC220LC-7 PC230-7 PC240LC-7K PC270-7 PC290NLC-7K ekskavatora

1. Product Identification
Component: Main Hydraulic Variable Displacement Axial Piston Pump Assembly

Manufacturer Model / Series: Komatsu HPV95 / HPV132 Series Architecture

Komatsu OEM Part Numbers: 708-2L-00300, 708-2L-00112 (7082L00300, 7082L00112, 708-2L-31123)

Machine Compatibility:

Komatsu PC200-7 / PC200LC-7

Komatsu PC210-7 / PC210LC-7

Komatsu PC220-7 / PC220LC-7

Komatsu PC230-7 / PC230LC-7

Komatsu PC240-7 / PC240LC-7K

Komatsu PC270-7 / PC290NLC-7K

Condition: Genuine Refurbished / Remanufactured to Factory Tolerance OEM Specs

2. Technical Specifications
Pump Type: Dual Tandem Variable Displacement Swash Plate Piston Pump

Flow & Power Management: Integrated hydraulic TVC (Torque Variable Control) regulators to match hydraulic power demand directly with engine horsepower curves.

System Working Pressure: High-pressure rating engineered for main working circuits (up to 37.3 MPa / 380 bar with boost).

Direct Flywheel Drive: Heavy-duty input drive shaft designed for direct connection to the engine flywheel dampener coupling.

Auxiliary Pilot Circuit: Equipped with integrated pilot supply gear pump for pilot valve pressure control.

3. Critical Installation Requirements
Hydraulic Pump Housing Priming (Mandatory)
Before starting the excavator engine, you must manually pre-fill the pump casing with clean, fresh hydraulic oil through the highest case drain port. Running an axial piston pump dry for even a few seconds will cause immediate scoring on the valve plate, cylinder block, and piston slippers, leading to total pump destruction.

Air Bleeding & Startup Procedure
After mounting and priming, loosen the air bleed plug on top of the pump housing. Crank the engine over with the fuel shutoff engaged until smooth, bubble-free hydraulic oil flows out, then tighten the plug. Run the machine at low idle with no load for 10–15 minutes to allow trapped air to vent through the return circuit.

Complete Hydraulic System Decontamination
If replacing a pump that suffered catastrophic mechanical breakdown, you must completely drain and flush the main hydraulic reservoir, clean the oil cooler, and flush all main feed lines. Replace all main return and suction filter elements before starting the unit.

Pilot & PC/LS Valve Pressure Calibration
Check and confirm that the pilot circuit control pressure and electronic proportional valve inputs match factory specifications. Incorrect pilot signal inputs can cause engine stalling or sluggish implement response.

4. Frequently Asked Questions (FAQ)
Q: Are part numbers 708-2L-00300 and 708-2L-00112 interchangeable?
A: Yes. These part numbers represent standard Komatsu engineering revisions and supersessions across the Dash-7 excavator generation (PC200-7 through PC290-7). They share identical physical frame mounting dimensions, hose port locations, and internal displacement specs.

Q: What process is involved in "Genuine Refurbished" condition?
A: Remanufactured/refurbished units undergo complete disassembly, deep ultrasonic cleaning, and full replacement of high-wear internal components (including piston shoes, barrel plates, swash plate bearings, and shaft seals). Every pump is bench-tested on a hydraulic test stand to verify flow rate, pressure holding, and regulator control curves before shipment.

Q: My PC200-7 stalls the engine when lifting heavy loads or digging. Will replacing the hydraulic pump fix this?
A: Engine stalling under load typically points to malfunctioning pump regulators (PC/LS valves) failing to destroke the pump when hydraulic demand exceeds engine horsepower output. Installing a properly calibrated pump assembly restores balanced power distribution.

5. Shipping & Logistics
Packaging: Thoroughly coated with anti-corrosion preservation oil, fitted with heavy-duty port caps, and bolted securely inside a heavy-duty export wooden crate.

Transit Time: Global express air freight via DHL/FedEx/UPS typically delivers within 3 to 7 business days, or via ocean freight for larger freight needs.