Description
SBS120 259-0815 Hydraulic Pump Assembly Overview
The SBS120 259-0815 Hydraulic Pump Assembly manufactured by Tatan is a tandem variable displacement axial piston pump belonging to our Hydraulic Pump Assembly classification. Engineered specifically for Caterpillar 320D, 320D L, and 320D GC 20-ton excavators, swapping out an internally worn or damaged unit with this complete SBS120 259-0815 Hydraulic Pump Assembly eliminates multi-actuator cycle sluggishness, severe hydraulic fluid overheating, and engine lugging under load.
Constructed strictly according to original Caterpillar OEM standards, this complete assembly integrates dual forged rotating groups, swashplate cradle bearings, and negative flow control regulators into a single turnkey unit, providing 100% direct bolt-on alignment with original C6.4 flywheel drive dampers and main valve high-pressure pipes.
Key Attributes & Parameters for SBS120 259-0815 Hydraulic Pump Assembly
| Product Category | Hydraulic Pump Assembly | Warranty | 1 Year / 12 Months |
| Specific Pump Model | Caterpillar SBS120 Tandem Piston Pump | Brand Name | Tatan |
| Compatible Equipment | Caterpillar 320D | 320D L Excavator | OEM Part Number | 259-0815 / 295-9675 / 304-4340 |
| Rated Working Pressure | 35.0 MPa (350 Bar / 5076 PSI) | Power Boost Pressure | 38.0 MPa (380 Bar / 5511 PSI) |
| Displacement & Flow | 112 cc/rev x 2 Dual Flow Output | Control System | Negative Flow Control (NFC) System |
| Machinery Test Report | Provided (100% Bench Flow Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Pump Design Type | Tandem Axial Variable Displacement | Place of Origin | Guangdong, China |
| Quality Status | 100% Brand New Hydraulic Pump | Packaging | Export Wooden Box Packaging |
Supported Machinery Brands & Hydraulic Pump Coverage
In addition to Caterpillar, Tatan manufactures replacement complete hydraulic main pumps, rotary groups, and regulators for leading equipment brands:
Application Scenarios & Buyer Value
When resolving hydraulic performance drop or pump failure with our SBS120 259-0815 Hydraulic Pump Assembly, workshops and equipment owners eliminate job-site downtime:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| CAT 320D Field Pump Replacement | Swapping to a complete SBS120 259-0815 Hydraulic Pump Assembly cuts repair downtime by days compared to piece-by-piece internal rebuilding. |
| Hydraulic Service Workshops | Avoids the high risk and unreliability of hand-lapping scored valve plates and worn cradle bearings on high-hour pump casings. |
| Heavy Quarry & Earthmoving Fleets | Restores full 35.0 MPa multi-actuator breakout pressure, preventing engine lugging and hydraulic power fade under continuous loads. |
| Global Heavy Machinery Stockists | Ready-to-ship, factory-tested replacement inventory supporting high-population Caterpillar 320D fleets worldwide. |
SBS120 259-0815 Hydraulic Pump Assembly OEM Diagnostic Guide
Use this technical diagnostic guide to identify hydraulic main pump failures on your Caterpillar 320D excavator:
| Hydraulic Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Sluggish multi-actuator movements & weak breakout force | High internal fluid bypass between worn piston shoes and the spherical valve plate, dropping system pressure below 26 MPa under load. | Replace with a factory-tested complete SBS120 259-0815 Hydraulic Pump Assembly. |
| 2. Rapid hydraulic fluid overheating (>85°C) during light digging | Excessive internal slippage inside the barrel bore clearances and regulator spool sticking, causing continuous high-pressure throttling. | Flush oil cooler lines, change hydraulic return filter, and install a brand new Tatan pump assembly. |
| 3. Loud whining cavitation noise & discharge hose vibration | Aeration from damaged suction flange O-rings, restricted suction strainer, or unprimed pump casing during startup. | Inspect suction plumbing, verify case drain fill, and replace the scored pump unit. |
| 4. Diesel engine lugs or stalls when raising boom or crowding arm | NFC regulator spool stuck at maximum displacement angle, or proportional power-shift solenoid failure failing to de-stroke pump. | Calibrate power-shift solenoid pressure or install a pre-adjusted replacement hydraulic pump unit. |
Transport Packaging & Fast Global Shipping
To ensure 100% damage-free international transport, every Tatan SBS120 hydraulic pump assembly is sealed with anti-rust port plugs, wrapped in heavy waterproof barrier film, and bolted inside an export-grade wooden crate.
✈️ Express Air Courier
Partnered with DHL, FedEx, UPS, and TNT for 3-7 day express door-to-door delivery worldwide.
🚢 Sea Cargo Freight
LCL and FCL ocean container shipping for heavy hydraulic assemblies and bulk stock orders.
📦 Export Wooden Cases
Fumigated solid wooden boxes with custom high-density foam inserts to prevent shipping shock.
Quality Control & International Certificates
Tatan hydraulic and engine components are manufactured under ISO 9001 certified quality control systems and strictly comply with international CE safety standards.
SBS120 259-0815 Hydraulic Pump FAQ & Related Categories
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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