Description
Cat 307B Hydraulic Main Pump Assembly Overview
The Cat 307B Hydraulic Main Pump assembly (OEM Part Numbers: 104-5858, 173-0663, 215-6804, AP2D36) manufactured by Tatan is a premium variable displacement axial piston double pump belonging to our heavy-duty Hydraulic Pump Assemblies classification. Designed specifically for Caterpillar CAT 307B, 307C, and 307D mini excavators, installing a Tatan replacement pump completely restores original 31.4 MPa hydraulic pressure and oil flow capacity.
Built according to original engineering documentation, this pump assembly pairs directly with Mitsubishi 4D32 and 4D34 diesel engines using a 13-teeth spline shaft, ensuring 100% exact bolt-on compatibility.
Key Attributes & Technical Parameters
| Product Category | Hydraulic Pump Assemblies | Warranty | 1 Year / 12 Months |
| Specific Pump Model | AP2D36 Series Dual Pump | Brand Name | Tatan |
| Compatible Equipment | CAT 307B / 307C Mini Excavator | OEM Part Number | 104-5858 / 173-0663 |
| Engine Model Series | Mitsubishi 4D32 / 4D34 Engine | Place of Origin | Guangdong, China |
| Machinery Test Report | Provided (100% Tested) | Video Outgoing-Inspection | Provided Before Shipping |
| Max Relief Pressure | 31.4 MPa (314 bar / 4550 PSI) | Pilot System Pressure | 3.9 MPa (39 bar / 565 PSI) |
| Rated Max Flow | 2 x 68.4 L/min @ 1900 RPM | Drive Shaft Spec | 13-Teeth Spline (13T / CW) |
| Quality Status | 100% Brand New with NOK Seals | Fluid Recommendation | ISO VG 46 / VG 68 Oil |
Supported Machinery Brands & Replacement Parts Coverage
In addition to Caterpillar, Tatan manufactures replacement main hydraulic pumps and spare parts for major excavator brands:
Application Scenarios & Buyer Value
| Application Scenario | Value Delivered to Buyer |
|---|---|
| CAT 307B Main Pump Replacement | 1:1 direct bolt-on installation eliminates machine downtime and restores original digging speed. |
| Hydraulic Repair Workshops | Replaces tedious internal component rebuilding; reduces labor hours and eliminates aftermarket warranty risks. |
| Parts Dealers & Stockists | High-demand replacement pump ready for immediate local resale to contractors and plant hire companies. |
| Contractor Fleet Maintenance | Cost-effective replacement option extending total CAT 307B excavator service lifecycle. |
Cat 307B Hydraulic Main Pump OEM Diagnostic Guide
Refer to this OEM manual hydraulic diagnostic guide to troubleshoot operational symptoms on your CAT 307B:
| Hydraulic Symptom | Technical Cause Analysis | Tatan Factory-Grade Solution |
|---|---|---|
| 1. Slow boom/arm operation & weak travel under high oil temp | Bimetallic valve plate or cylinder block surface scoring causing high-pressure internal oil bypass (>31.4 MPa drop). | Install Tatan 104-5858 complete hydraulic main pump assembly; flush tank lines and replace 10μm oil return filter. |
| 2. Engine stalling / Lugging down when pulling hydraulic pilot levers | Negative flow control regulator spool sticking or torque spring fatigue, overloading the Mitsubishi 4D34 engine. | Disassemble and clean pump regulator; lap spool clearance to 0.005mm tolerance or install a new complete pump assembly. |
| 3. Loud cavitation noise & oil foaming in hydraulic reservoir | Air ingress through suction flange O-rings or cracked suction rubber hose causing vacuum cavitation. | Reseal suction intake with high-temp HNBR O-rings; check hydraulic oil level and bleed air from pump casing. |
| 4. Front shaft oil seal blowout into engine bellhousing | Casing drain line blockage or internal bypass wear causing drain pressure to exceed 0.2 MPa. | Clear case drain return lines, replace front shaft seal with high-pressure NOK seal, and test casing relief pressure. |
Transport Packaging & Fast Global Shipping
To ensure 100% damage-free international transport, every Tatan Cat 307B hydraulic main pump undergoes anti-rust oiling, waterproof plastic sealing, and solid export wooden box packaging.
✈️ 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 bulk hydraulic equipment orders.
📦 Export Wooden Cases
Fumigated solid wooden boxes with thick shockproof foam lining for maximum safety.
Quality Control & International Certificates
Tatan hydraulic pumps are manufactured under ISO 9001 quality management systems and strictly comply with CE safety standards.
Cat 307B Hydraulic Main Pump FAQ & Related Parts
* Note: Wholesale Reference Price Starts From $300.00. Please contact Gavin for a final customized quote.
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