Description
Primary hydraulic power generation on the 5.5-ton Doosan DH55 (and Daewoo Solar 055) is driven by a multi-circuit tandem variable displacement axial piston pump coupled to the Yanmar 4TNV94L engine. Tatan Machinery stocks and supplies 100% Brand New PSVD2-19E hydraulic main pump assemblies (OEM reference: 2401-9236 / 2401-9236A, interchangeable with 401-00020 / 2401-9154). Pre-assembled with dual variable swashplate rotating groups and twin integrated gear pumps for pilot and auxiliary circuits, each complete unit is factory dynamometer-tested under full 24.5 MPa working relief pressure. Backed by our 12-Month Comprehensive Replacement Warranty.
Physical Storefront & Showroom Product Display
Tatan Machinery is a verified first-party physical stocking wholesaler of excavator hydraulic assemblies. We do not dropship unverified products. All hydraulic pumps, main valves, and travel drives supplied on our site are 100% Brand New (diesel engines are remanufactured to OEM tolerances). Below is our physical showroom product presentation:
Actual shelf display and physical showroom stock at Tatan Machinery facility
Technical Specifications & Output Metrics
| Parameter | Engineering Metric |
|---|---|
| Hydraulic Pump Series | PSVD2-19E / PSVD2-21E Tandem Variable Swashplate Piston Pump |
| Integrated Circuit Sections | P1 & P2 Variable Piston (Implements) + P3 & P4 Gear Pumps (Pilot & Slew Assist) |
| Rated Main Working Pressure | 24.5 MPa (250 bar / 3,553 PSI) Continuous Relief Threshold |
| Total Delivery Flow Rate | Approx. 2 × 55 L/min (Piston) + 2 × 20 L/min (Gear) @ 2,200 Engine RPM |
| Input Drive Shaft Type | Involute Spline Shaft matched for Yanmar 4TNV94L Flywheel Damper |
| Dry Assembly Weight | Approx. 42 kg (92.5 lbs) Complete Drop-in Assembly |
| Standard Machine Match | Doosan DH55, DH55-5, Daewoo Solar 055, Solar 055V (5.5-Ton Class) |
Field Diagnostics: Why Rebuilding Worn DH55 Main Pumps Fails
The Doosan DH55 operates as a continuous production machine. In heavy clay digging and breaker duty, on-site overhauls with individual rotary parts frequently lead to repeated breakdowns:
- Swashplate Cradle Galling & Severe Machine Hesitation: Operating with contaminated hydraulic fluid scores the polymer saddle bearings supporting the PSVD2 swashplates. The pump fails to destroke when hydraulic pressure peaks, severely bogging or stalling the Yanmar 4TNV94L engine.
- Cylinder Barrel & Valve Plate Thermal Distortion: High-pressure bypass leakage across worn bi-metallic valve plates dumps continuous heat into the case-drain line. When oil temperatures exceed 55°C, digging breakout force collapses completely.
- Integrated Pilot Gear Pump Cavitation: Worn rear gear pump bushings suck air past the shaft seals, causing severe frothing in the hydraulic tank and making the joystick controls feel jerky and unresponsive.
- Risk of Metal Shavings Destroying the 2436-1004 Control Valve: Piston slipper shoe delamination releases bronze filings into the delivery steel lines, permanently seizing the spools in the expensive main control valve.
12-Month Comprehensive Replacement Warranty
Every 100% Brand New 2401-9236 hydraulic pump supplied by Tatan Machinery includes our full 12-Month Replacement Guarantee:
- Full Major Mechanical Coverage: Body casting fractures, internal cylinder barrel cracks, piston slipper separation, and shaft shear resulting from manufacturing defects.
- Direct Replacement Support: If any defect occurs under proper hydraulic maintenance, we dispatch immediate replacement components or complete pump assemblies without lengthy disputes.
Export Heavy-Duty Packaging Protocol & Crating Video
Precision axial piston pump assemblies require clinical protection against airborne moisture and rough cargo handling:
- 100% Sealed Metal/Threaded Port Plugs: Main suction inlet, high-pressure delivery outlets, and pilot charge ports sealed with heavy-duty threaded blanking caps.
- Anti-Corrosion VCI Protective Wrap: Input spline shaft and unpainted mounting flanges coated with rust-inhibiting grease and vacuum-sealed in VCI protective foil.
- ISPM 15 Solid Plywood Box with Steel Strapping: Secured onto structural timber framing inside a fumigation-free solid export crate.
📹 Live Wooden Crate Packaging & Dispatch Video
Watch our export team crate, bolt down, and band this brand-new 2401-9236 hydraulic pump:
✓ Live crating and strapping filmed at Tatan Machinery dispatch dock
Supported Global Logistics & Customs Documentation
Prompt logistics dispatch adapted for urgent machine-down emergencies and trade stock:
- Air Express (3–7 Days Door-to-Door): Handled via DHL Express, FedEx, or air cargo for rapid jobsite recovery.
- Sea Freight Consolidation: Economical LCL shipping for distributors stocking multiple units.
- Tariff-Ready Paperwork: Commercial invoice detailing official HS Code (8413.60 – Hydraulic Piston Pumps), packing lists, and Certificate of Origin (COO) upon request.
Daily overseas air express dispatches and containerized freight loading
Buyer Procurement FAQ: Key Decision Factors
Q: Is this 2401-9236 hydraulic main pump brand new or remanufactured? Does it include pilot gear pumps?
A: This hydraulic pump is 100% Brand New with zero operating hours. It comes completely assembled with brand-new tandem variable piston rotating groups, swashplate cradles, and the integrated rear gear pumps for pilot and auxiliary circuits. It is a complete drop-in replacement ready for immediate installation.
Q: Are your hydraulic pumps and other products brand new as well?
A: Yes. All our hydraulic pumps, main control valves, final drive travel motors, and swing motors are 100% Brand New. Only our heavy diesel engine assemblies on this site are professionally remanufactured with brand-new internal wear components. You can order with absolute confidence in factory-new metallurgical reliability.
Q: My Doosan DH55 has part number 401-00020 or uses AP2D25. How do you confirm fitment?
A: 2401-9236, 2401-9236A, and 401-00020 are directly interchangeable Doosan/Daewoo OEM part numbers used across DH55 and Solar 055 production batches. Send your machine’s serial number (PIN) from the cab tag and photos of your current pump nameplate to Gavin. We cross-verify the exact pump arrangement code in the official Doosan EPC database within 10 minutes.
Q: Can I see live photos and stamped serial numbers of the actual pump before dispatch?
A: Absolutely yes. Transparency is our core commitment. 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 – Hydraulic Piston Pumps), detailed packing lists, and Certificates of Origin for smooth customs clearance at your destination port.
🔗 Frequently Purchased Together with Doosan DH55 Hydraulic Main Pump:
- DIESEL ENGINE:
Doosan DH55 Yanmar 4TNV94L Diesel Engine Assembly
Remanufactured - CONTROL VALVE:
Main Control Valve Assembly (2436-1004) for Doosan DH55
100% Brand New - SWING MOTOR:
Hydraulic Swing Motor Assembly for Doosan DH55
100% Brand New - FINAL DRIVE:
Final Drive Travel Motor Assembly for Doosan DH55
100% Brand New - BRAND CATALOG:
View All Doosan Excavator & Heavy Equipment Parts Collection
Get Wholesale Factory Quote for Doosan DH55 Main Pump 2401-9236
Looking for direct factory pricing, stock availability, or 12-month warranty terms for Doosan DH55 main pumps? Contact senior specialist Gavin now!
💡 Fast Quote: Send your machine serial number or old 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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