Pompe hydraulique Komatsu 708-1L-00412 pour excavateur Komatsu PC100-6 PC120-6 PC130-6 PC120-6E

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

Manufacturer Model / Series: Komatsu HPV90 / HPV95 Series Architecture

Komatsu OEM Part Numbers: 708-1L-00412, 708-1L-00411, 708-1L-00413, 708-1L-00530, 708-1L-00070, 708-1L-00032, 708-1L-00071 (7081L00412, 7081L00411, 7081L00413, 7081L00530, 7081L00070, 7081L00032, 7081L00071)

Machine Compatibility:

Komatsu PC100-6 / PC100L-6

Komatsu PC120-6 / PC120LC-6

Komatsu PC130-6 / PC130LC-6 Excavator

Condition: Genuine Original New / Premium OEM Specification Equivalent (Complete Drop-In Assembly)

2. Technical Specifications
Pump Type: Variable Displacement Swash Plate Axial Piston Pump with Auxiliary Pilot Section

Flow & Pressure Control: Equipped with Komatsu TVC (Torque Variable Control) and LS (Load Sensing) regulators to balance fluid delivery according to load demand and engine output power (up to 34.3 MPa / 343 bar).

Drive Interface: Heavy-duty input drive shaft engineered for direct connection to the engine flywheel dampener coupling.

Integrated Pilot Section: Includes integrated pilot supply gear pump for joystick pilot control logic circuits.

3. Critical Installation Requirements
Hydraulic Pump Housing Priming (Mandatory)
Before starting the engine, manually fill the main pump casing with clean, fresh hydraulic fluid through its highest case drain port. Running an axial piston pump dry—even for a few seconds—will score the valve plate, cylinder block, and piston slippers, causing immediate internal destruction.

Air Bleeding & Initial Startup Procedure
After mounting and priming, loosen the air bleed plug on top of the pump housing. Crank the engine with the fuel shutoff engaged until clear, bubble-free hydraulic oil flows out, then tighten the plug. Run the excavator at low idle with no load for 10 to 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.

TVC / LS Pressure & Pilot 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 708-1L-00412, 708-1L-00411, 708-1L-00530, and 708-1L-00070 interchangeable?
A: Yes. These part numbers represent standard Komatsu factory engineering revisions, supersessions, and dash updates across the PC100-6, PC120-6, and PC130-6 model lines. They share identical physical frame mounting dimensions, input drive splines, and main port patterns.

Q: My Komatsu PC120-6 bogs down or stalls the engine when lifting heavy loads. Is the main pump failing?
A: Engine stalling under load typically points to malfunctioning pump regulators (TVC/LS valves) failing to destroke the pump when hydraulic pressure spikes beyond engine torque capability. Installing a properly calibrated pump assembly restores balanced power distribution.

Q: Does the pump unit arrive fully assembled with regulators pre-installed?
A: Yes. The assembly is delivered fully intact, pre-configured with the factory TVC/LS control regulators and the auxiliary pilot pump section pre-tested for direct plug-and-play installation.

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