Description
SBS80 311-7404 Hydraulic Pump Assembly Overview
The SBS80 311-7404 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 312D, 312D L, 313D, 314D CR, and 311D LRR 12-14 ton hydraulic excavators, swapping to a complete SBS80 311-7404 Hydraulic Pump Assembly unit eliminates sluggish compound movements, high-pressure internal bypass, and engine stall under heavy trenching loads.
Constructed with dual high-pressure rotating groups, hardened bi-metal valve plates, and factory-calibrated negative flow control (NFC) regulators, this complete unit ensures balanced flow division across implement circuits and delivers 100% direct mechanical alignment with Cat C4.2 ACERT engine flywheel couplings.
Key Attributes & Parameters for SBS80 311-7404 Hydraulic Pump Assembly
| Product Category | Hydraulic Pump Assembly | Warranty | 1 Year / 12 Months |
| Specific Pump Model | Cat SBS80 / K3V63DT Tandem Axial Piston Pump | Brand Name | Tatan |
| Compatible Equipment | Caterpillar 312D | 312D L | 313D | 314D CR | OEM Part Number | 311-7404 / 391-9417 / 391-9442 |
| Rated Working Pressure | 35.0 MPa (350 Bar / 5075 PSI) / Boost 37.5 MPa | Control System | Negative Flow Control (NFC) & Power Shift |
| Flow Displacement & RPM | 63 cc/rev x 2 Dual Flow @ 2000 RPM (2 x 128 L/min) | Input Drive Spline | Involute Spline Shaft for Cat C4.2 Flywheel |
| Machinery Test Report | Provided (100% Bench Flow Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Housing Metallurgy | High-Tensile Cast Iron Body (130kg) | Place of Origin | Guangdong, China |
| Quality Status | 100% Brand New Hydraulic Pump | Packaging | Export Reinforced Wooden Box Packaging |
Supported Machinery Brands & Hydraulic Pump Coverage
In addition to Caterpillar, Tatan manufactures replacement complete hydraulic pumps, rotary groups, and regulators for leading machinery brands:
Application Scenarios & Buyer Value
When resolving hydraulic pressure loss and sluggish cycle times with our SBS80 311-7404 Hydraulic Pump Assembly, workshops and equipment contractors eliminate operational downtime:
| Application Scenario | Value Delivered to Buyer |
|---|---|
| Cat 312D Field Pump Replacement | Installing the SBS80 311-7404 Hydraulic Pump Assembly cuts equipment overhaul downtime by up to 75% compared to trial-and-error field rebuilding on compact pump bodies. |
| Hydraulic Service Workshops | Avoids the high failure risk of reusing warped swashplate cradles or scored cylinder barrel casings that cause internal bypass under 13-ton loads. |
| Municipal & Civil Contractors | Restores rapid simultaneous boom raising, bucket crowding, and swing rotation without C4.2 engine stalling under heavy 0.65 m³ trenching loads. |
| Global Heavy Machinery Stockists | Fully bench-tested, export-crated inventory ready for prompt international air express or container shipment. |
SBS80 311-7404 Hydraulic Pump Assembly OEM Diagnostic Guide
Use this technical diagnostic guide to identify hydraulic pump faults on your Caterpillar 312D excavator:
| Hydraulic Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Digging speed slows down dramatically when oil heats up | Severe internal oil leakage across scored valve plates and worn piston shoes, dropping flow output and system pressure below 25.0 MPa. | Replace with a complete factory-tested SBS80 311-7404 Hydraulic Pump Assembly. |
| 2. Cat C4.2 engine bogs down or stalls when curling the bucket | Negative flow control (NFC) regulator spool stuck in maximum swashplate angle position, overloading the engine under relief pressure. | Inspect regulator pilot pressure signal (3.9 MPa) or swap to a pre-calibrated factory pump assembly. |
| 3. Loud whining noise & pump body pulsation under load | Pump cavitation caused by restricted suction strainer, aerated hydraulic oil, or damaged suction manifold O-ring seals. | Clean suction line, replace hydraulic return filters, bleed pump casing air, and check pump priming before restart. |
| 4. External oil leak from the pump front drive shaft seal | High case-drain backpressure exceeding 0.25 MPa due to clogged case-drain filters, blowing out the front drive shaft oil seal. | Clear case-drain line restrictions, replace case filters, and install a brand new sealed pump assembly. |
Transport Packaging & Fast Global Shipping
To ensure 100% damage-free international transport, every Tatan hydraulic pump assembly is coated with anti-rust fluid, capped with steel threaded plugs, sealed in heavy waterproof barrier film, and bolted inside an export-grade reinforced 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 pumps 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 components are manufactured under ISO 9001 certified quality control systems and strictly comply with CE industrial machinery safety directives.
SBS80 311-7404 Hydraulic Pump Assembly FAQ & Related Categories
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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