Description
Tatan Machinery supplies 100% Brand New SBS140 tandem hydraulic main pump assemblies (OEM part numbers: 377-4950 / 377-4968, interchangeable with 369-9641 / 349-4066 / 465-1020) for Caterpillar 336E and 336E L heavy crawler excavators. Driven directly by the Cat C9.3 diesel engine through a flexible coupling, this variable displacement dual axial piston pump delivers primary hydraulic power to the entire machine. Backed by our 12-Month Comprehensive Warranty, each complete assembly is pre-fitted with hydraulic regulators, electronic proportional solenoid valves, and factory bench-tested to verify flow rates, peak relief pressures, and internal case drain integrity.
Supplier Information & Build Status
| Supplier: | Tatan Machinery (Professional Excavator Parts Supplier) |
| Product Category: | Hydraulic Pump Assembly / Hydraulic Parts |
| Pump Model: | SBS140 Tandem Variable Axial Piston Pump |
| OEM Reference: | 377-4950 / 377-4968 (Cross Ref: 369-9641, 349-4066, 465-1020, 488-4577) |
| Product Condition: | 100% Brand New (Zero Hours, Complete with Regulators, Pilot Block & Solenoids) |
| Warranty Coverage: | 12 Months / 1-Year Comprehensive Replacement Warranty |
| Target Machine Brand: | Caterpillar Excavator Parts |
🏢 Tatan Machinery Hydraulic Pump Testing & Storage Facility
Physical inventory storage, hydraulic bench testing, and pre-export crating facility:
📹 Live Hydraulic Pump Bench Inspection Video
Watch our engineer verify pump regulators, input shaft splines, and factory inspection marks:
Physical inventory — ready for global crating. Video inspection calls and warehouse visits welcome.
Technical Specifications
| Parameter | Specification Data |
|---|---|
| Pump Construction | Tandem Swashplate-Type Axial Piston Pump (Front Pump + Rear Pump) |
| Displacement per Pump | 2 × 140 cc/rev (280 cc total displacement) |
| Maximum Working Pressure | 34.3 MPa (350 bar / 5,076 PSI) / Heavy Lift Mode: 37.3 MPa |
| Maximum Rated Flow Rate | 2 × 280 L/min (560 L/min total flow) |
| Input Drive Shaft Type | Involute Spline Shaft matched for Cat C9.3 Flywheel Coupling |
| Flow Control Method | Negative Flow Control (NFC) with Electronic Proportional Solenoid Modulation |
| Total Assembly Weight | Approx. 210 kg (463 lbs) Complete with Regulators |
| Standard Machine Match | Caterpillar 336E / 336E L Heavy Excavators |
When to Replace the Hydraulic Main Pump on CAT 336E: Diagnostic Criteria
In heavy rock production and mass excavation, the CAT 336E relies on hydraulic output stability. Rebuilding a disintegrated pump on-site frequently fails due to residual contamination. Replace the complete assembly under these severe symptoms:
- Slipper Shoe Delamination & Piston Seizure: Piston shoe brass peeling off under high pressure cavitation, jamming pistons into the cylinder barrel bores and shearing the pump drive shaft.
- Swashplate & Valve Plate Galling: Severe friction scoring between the rotating cylinder block and stationary valve plate, causing massive internal case leakage and dropping digging power by over 40%.
- Heavy Hydraulic Oil Overheating: Case drain oil flow exceeding 15 L/min dumping extreme heat back into the hydraulic tank, causing oil temperature alarms (>95°C) within minutes of hard digging.
- Hydraulic Chattering & Severe Pump Cavitation Noise: Severe metallic groaning during arm crowding or boom elevation, indicating worn swashplate support bearings and erratic swash angle control.
Workshop Bench Testing & 12-Month Warranty Guarantee
Every 100% Brand New SBS140 hydraulic pump supplied by Tatan Machinery comes backed by a 12-Month Comprehensive Replacement Warranty. Before crate sealing, our hydraulic engineers execute a 5-point dynamic bench test protocol:
- Full-Pressure Continuous Hold Test: Main circuits loaded to 34.3 MPa (350 bar) continuous pressure and 37.3 MPa relief surges on our 450 kW digital test stand to confirm structural casting integrity.
- Case Drain Leakage Verification: Precision flow-meter measurement of internal slippage across both front and rear rotating groups. Maximum allowable leakage is strictly maintained below 3.5 L/min at operating oil temperature (55°C).
- Regulator Stroke & NFC Response Calibration: Negative flow control curves and electronic proportional pressure-reducing valves (PRV) calibrated to factory Caterpillar ECM communication specs.
- Dual-Pump Flow Synchronization Test: Testing flow parity between pump 1 and pump 2 across the full swash angle range to ensure the excavator tracks in a straight line without pulling to one side.
- Drive Shaft Concentricity & Seal Integrity: Dial indicator runout check on the input spline shaft and 1.0 bar pneumatic air test on the front shaft seal.
📹 Live Hydraulic Pump Bench Inspection Video
Watch our engineer verify pump regulators, input shaft splines, and factory inspection marks:
✓ Real physical unit filmed at Tatan Machinery workshop
Export Heavy-Duty Packaging Process
Hydraulic pumps have mirror-finished internal components susceptible to moisture and vibration. We enforce industrial packaging standards:
- 100% Sealed Metal Port Plugs: Main suction flange (4-bolt SAE), discharge flanges, pilot ports, and case drain fittings sealed with heavy metal blanking plates and o-ring caps.
- Anti-Corrosion VCI Wrapping: The pump exterior and bare spline shaft are coated with protective anti-rust oil and hermetically sealed inside VCI plastic sheeting.
- Heavy Internal Timber Base Skids: The 210 kg assembly is bolted down through its heavy mounting flange onto structural timber cradles inside the box.
- Solid ISPM 15 Export Wooden Box: Fumigation-free solid plywood crating reinforced with high-tensile galvanized steel straps.
Actual sealed port caps and heavy-duty crating for SBS140 hydraulic pump
Global Shipping & Customs Documentation
Direct international dispatch tailored for commercial contractors and parts distributors:
- Emergency Machine Down Air Cargo: Fast air express via DHL Aviation, FedEx Freight, or international airlines within 3–7 business days.
- Consolidated Ocean Sea Freight (LCL / FCL): Direct containerized shipping to worldwide commercial ports.
- Clean Customs Clearance Paperwork: Commercial Invoices with correct HS Code (8413.60 – Hydraulic Piston Pumps), Packing Lists, and Certificates of Origin for tariff optimization.
Container loading and air freight dispatch supported by global logistics partners
Critical Installation Guidelines (CAT 336E Pump Mechanic Checklist)
To prevent instant failure and protect your 12-month warranty, technicians MUST adhere to these critical procedures:
- MANDATORY: Pre-Fill Pump Case with Clean Hydraulic Oil: Before starting the engine, remove the top case drain plug and pour clean ISO VG 46 hydraulic oil directly into the pump casing until full. Starting a dry pump will destroy the slipper shoes and valve plate in less than 5 seconds!
- Drain & Flush Hydraulic Tank & Coolers: If the previous pump disintegrated, brass and steel debris coat the hydraulic reservoir. You MUST drain the oil, wipe the tank bottom with clean lint-free rags, and install new suction and return filter elements.
- Inspect Flywheel Drive Coupling: Check the rubber dampening element between the Cat C9.3 engine flywheel and the pump shaft. Replace cracked, heat-hardened couplings to prevent torsional shear of the input spline.
- Purge Air from Regulators & Pilot Lines: Loosen air bleed plugs on top of the pump regulators while cranking the engine with fuel shut off until solid, bubble-free hydraulic oil flows out.
- Run at Low-Idle No-Load for 15 Minutes: Start the engine at low idle (800 RPM). Operate boom and swing lightly without hitting relief pressure to circulate oil and allow all internal air to escape to tank.
Buyer Frequently Asked Questions (Purchasing FAQ)
Q: Is this SBS140 main pump brand new or remanufactured? Does it include regulators?
A: This SBS140 hydraulic pump is 100% Brand New with zero operating hours. It comes completely assembled with brand-new dual hydraulic regulators, electronic proportional solenoid valves, and pilot distribution blocks. It is a complete drop-in replacement ready for immediate installation.
Q: What is covered under your 12-month warranty for this hydraulic pump?
A: Our 12-Month Comprehensive Warranty covers all internal mechanical failures resulting from manufacturing or metallurgical defect—including cylinder barrel failure, piston shoe delamination, valve plate cracking, and shaft shear. If any defective issue arises under proper operating conditions, Tatan Machinery provides prompt replacement support.
Q: My CAT 336E has different part numbers (377-4950 vs 377-4968 / 369-9641). How do you confirm fitment?
A: These are interchangeable Caterpillar OEM assembly numbers used across different production years. Send your machine’s 17-digit PIN number from the cab tag and photos of your current pump nameplate to Gavin. We cross-verify the exact pump arrangement code in the official Caterpillar parts database within 10 minutes.
Q: Can I see live test bench video and stamped serial numbers of the actual pump before dispatch?
A: Absolutely yes. Prior to balance payment and dispatch, we send clear photos and live video of the exact unit assigned to your order. You will see the stamped serial tag, input spline teeth, sealed steel port plates, and the wooden box packaging process.
Q: What happens if the pump crate is damaged during sea freight, and what customs documentation is supplied?
A: Every shipment from Tatan Machinery is protected by full commercial marine cargo insurance. The pump is bolted down directly onto internal skids within a fumigation-free solid plywood crate. We supply commercial invoices with accurate HS Codes (8413.60), detailed packing lists, and Certificates of Origin for smooth customs clearance at your destination port.
🔗 Frequently Purchased Together with CAT 336E Hydraulic Main Pump:
- DIESEL ENGINE:
Caterpillar C9.3 Diesel Engine Assembly for CAT 336E (379-3736)
Remanufactured - MAIN VALVE:
KMX32NB 428-2749 Main Control Valve Assembly for Caterpillar 336E
100% Brand New - SWING MOTOR:
M5X180 Swing Motor Assembly for Caterpillar 336E
100% Brand New - BRAND CATALOG:
View All Caterpillar Excavator & Heavy Equipment Parts Collection
Get Wholesale Factory Quote for SBS140 377-4950 Hydraulic Pump
Looking for direct factory pricing, stock availability, or 12-month warranty terms for Cat 336E main pumps? Contact senior specialist Gavin now!
💡 Fast Quote: Send your machine serial number or current pump nameplate photos for an accurate match within 10 minutes!
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote based on freight destination and configuration.
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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