398-7478 3987478 hydraulic pump for Caterpillar 304.5E 304.5E2 mini excavator
If you decide to buy equipment at a low price, make sure that you communicate with the real seller. Find out as much information about the owner of the equipment as possible. One way of cheating is to represent yourself as a real company. In case of suspicion, inform us about this for additional control, through the feedback form.
Before you decide to make a purchase, carefully review several sales offers to understand the average cost of your chosen equipment. If the price of the offer you like is much lower than similar offers, think about it. A significant price difference may indicate hidden defects or an attempt by the seller to commit fraudulent acts.
Do not buy products which price is too different from the average price for similar equipment.
Do not give consent to dubious pledges and prepaid goods. In case of doubt, do not be afraid to clarify details, ask for additional photographs and documents for equipment, check the authenticity of documents, ask questions.
The most common type of fraud. Unfair sellers may request a certain amount of advance payment to “book” your right to purchase equipment. Thus, fraudsters can collect a large amount and disappear, no longer get in touch.
- Transfer of prepayment to the card
- Do not make an advance payment without paperwork confirming the process of transferring money, if during the communication the seller is in doubt.
- Transfer to the “Trustee” account
- Such a request should be alarming, most likely you are communicating with a fraudster.
- Transfer to a company account with a similar name
- Be careful, fraudsters may disguise themselves as well-known companies, making minor changes to the name. Do not transfer funds if the company name is in doubt.
- Substitution of own details in the invoice of a real company
- Before making a transfer, make sure that the specified details are correct, and whether they relate to the specified company.
Seller's contacts
+86 199 246...
+86 199 2461 6345
Poland, Tarnowskie Góry
OEM Hydraulic Main Pump for CAT 304.5E 304.5E2 Mini Excavator | Part No. 398-7478 3987478
1. Product Overview
The 398-7478 is a high-efficiency, variable displacement axial piston pump engineered for the specialized hydraulic demands of the CAT 304.5E series. As the primary power source for the machine, it delivers the high-pressure flow required for simultaneous operations of the boom, arm, bucket, and travel motors. Its advanced design ensures precise control, reduced fuel consumption, and the high breakout force necessary for 4.5-ton class excavation tasks.
2. Technical Specifications & Parameters
Caterpillar Part Number: 398-7478 / 3987478
Machine Compatibility: Caterpillar (CAT) 304.5E, 304.5E2
Pump Type: Variable Displacement Axial Piston Pump
Control System: Integrated load-sensing technology to optimize hydraulic power distribution and prevent engine lugging.
Operating Pressure: Factory-calibrated to CAT high-pressure specifications for maximum digging and lifting performance.
Internal Components: Features hardened steel pistons, precision-ground valve plates, and high-load capacity bearings for extended service life.
Mounting: Standardized OEM flange and spline shaft for a 100% direct "plug-and-play" replacement.
3. Why Partner With a 13-Year Industry Expert?
Technical Mastery: We specialize in the specific hydraulic requirements of CAT E-series excavators. Our pumps are calibrated to restore the original "factory feel" to your joystick response and travel speed.
Rigorous Bench Testing: Every unit undergoes a comprehensive hydraulic test to verify volumetric efficiency, pressure stability, and response times before it is cleared for export.
Factory-Direct Value: Leverage our 13-year optimized supply chain for competitive wholesale pricing, offering a significant cost advantage over local retail dealerships.
Global Logistics Expertise: All pumps are secured in reinforced, shock-proof export wooden crates. We offer rapid delivery via DHL, FedEx, or UPS, typically arriving in 3 to 7 business days.
4. Critical Installation & Maintenance Protocol
Case Priming (Mandatory): You must fill the pump housing with clean, fresh hydraulic oil through the highest drain port before starting the engine. Running the pump "dry" will cause immediate and irreversible internal damage to the pistons and bearings.
System Decontamination: If the previous pump suffered a mechanical failure, you must flush the entire hydraulic tank, lines, and oil cooler. Residual metallic debris is the primary cause of premature failure in new pumps.
Filter Mandate: Always install a new high-efficiency hydraulic return filter and suction strainer during the pump replacement to maintain oil cleanliness and protect the precision internal components.
5. Ordering & Professional Support
Fitment Verification: To ensure 100% accuracy, please provide your machine Serial Number (e.g., Prefix K5K or MEB) or a photo of your existing pump nameplate.
Instant Quote: Contact us today for up-to-date pricing, tiered quality options (Original New vs. Premium OEM), and current stock availability.
Technical Guidance: Our expert team is available 24/7 to provide professional guidance on installation, system flushing, and hydraulic troubleshooting.