مضخة هيدروليكية Caterpillar SBS140 200-3365 لـ حفارة Caterpillar 324D 325C 325D 326D 329D

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

Pump Model / Architecture: Caterpillar / Mitsubishi SBS140 Series

Caterpillar OEM Part Numbers: 200-3365, 239-6525, 272-6957, 200-3343, 178-6641, 244-8477, 244-8479, 272-6959, 233-1115 (2003365, 2396525, 2726957, 2003343, 1786641, 2448477, 2448479, 2726959, 2331115)

Machine Compatibility:

Caterpillar (CAT) 324D / 324D L

Caterpillar (CAT) 325C / 325C L

Caterpillar (CAT) 325D / 325D L

Caterpillar (CAT) 326D / 326D L

Caterpillar (CAT) 329D / 329D L Excavator

Condition: Brand New Original / Premium OEM Specification Equivalent (Complete Drop-In Unit)

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

Flow & Pressure Control: Features integrated dual electronic regulators (PRV) and power-management control valves to precisely regulate fluid output (up to 35 MPa / 350 bar) to match C7/C9 ACERT engine horsepower curves.

Drive Configuration: High-strength input spline shaft designed to couple directly with the engine flywheel dampener.

Pilot Auxiliary Supply: Features an integrated auxiliary pilot gear pump section for joystick pilot control circuits.

3. Critical Installation Requirements
Hydraulic Pump Housing Priming (Mandatory)
Before starting the engine, manually fill the main pump housing with clean, fresh hydraulic fluid through its highest case drain port. Running an SBS140 axial piston pump dry—even for a few seconds during startup—will cause severe scoring on the swash plate, cylinder barrel, and piston slippers, leading to immediate catastrophic failure.

Air Bleeding & Initial Startup Procedure
Loosen the air bleed plug on top of the pump casing after filling. Crank the engine with fuel cut off until a steady stream of bubble-free hydraulic oil flows out, then re-tighten the plug. Run the excavator at low idle with zero load for 10 to 15 minutes to allow remaining air in the return loops to purge.

Complete System Decontamination
If replacing a pump that suffered internal disintegration or mechanical failure, you must drain and clean the main hydraulic oil reservoir, flush all main control valve feed lines, and clear the oil cooler. Replace all main return and suction filter elements to prevent residual metallic debris from destroying the new unit.

Proportional Relief Valve (PRV) & Pressure Calibration
Check and verify pilot pressure and electronic PRV solenoid harness connections. Calibrate main relief pressures to factory CAT specifications to ensure smooth multi-function response and avoid engine stalling under heavy digging loads.

4. Frequently Asked Questions (FAQ)
Q: Are all these CAT part numbers (200-3365, 239-6525, 272-6957, etc.) interchangeable?
A: Yes. These part numbers represent Caterpillar factory engineering revisions, regulator block supersessions, and dash updates across the 324D, 325C/D, and 329D excavator families. They all cross-reference to the SBS140 pump architecture and share identical physical mounting, input drive splines, and main port patterns.

Q: My CAT 325D bogs down or stalls the engine when working in heavy digging modes. Is the SBS140 pump at fault?
A: Engine stalling under load typically indicates that the electronic pump regulators (PRV) or proportional solenoid valves are sticking or failing to destroke the pump as pressure spikes. Replacing or recalibrating the main hydraulic pump assembly restores proper engine-to-hydraulic power balance.

Q: Does the pump unit arrive fully assembled with regulators and pilot pump attached?
A: Yes. The assembly is delivered fully intact, pre-configured with dual proportional regulators, control valves, and the auxiliary pilot pump section pre-tested for immediate plug-and-play installation.

5. Shipping & Logistics
Packaging: Preserved with rust-inhibiting storage oil, sealed with heavy-duty port plugs, and bolted securely 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, with sea freight options available for bulk shipments.