504-5477 Hydraulic Piston Pump 336D2 336D2 L 340D2 L Excavator Main Pump Assembly Replacement

504-5477 Hydraulic Piston Pump – Excavator Main Pump for 336D2 / 340D2 L

The 504-5477 is a variable displacement axial piston pump supplied as the main hydraulic pump for 336D2, 336D2 GC, 336D2 L and 340D2 L excavators. Mounting flange, drive shaft spline, port positions and regulator arrangement follow the original unit, so the pump can be installed without modifying the pump compartment.

Technical Specifications

Key Features

• Part-number matched. Supplied against 504-5477, so the flange, spline and port layout match the original pump on 336D2, 336D2 GC, 336D2 L and 340D2 L machines.
• Flow and pressure tested. Each pump is bench tested for delivery flow, pressure holding and regulator response before packing.
• Regulator arrangement confirmed. Control type is checked against your existing pump, so the machine's hydraulic response stays as original.
• Complete assembly. Pump body and regulator are supplied as one unit, reducing installation time on site.
• Factory direct supply. Produced in our Guangdong workshop, with stock available for urgent breakdown orders.

Fitment Notes

Please confirm your machine model, serial number and the part number stamped on the existing pump before ordering – machines within the same series can be built with different pump regulators. Send us a photo of the pump nameplate, the regulator and the connector, and our team will cross-reference 504-5477 within 24 hours.

FAQ by Market

Q1: North America & Europe – how do I confirm fitment before I pay?
Send photos of the old pump nameplate, the regulator and the connector, plus your machine model and serial number. We confirm the part number and control arrangement within 24 hours, and can supply dimension drawings for approval before shipment.

Q2: European Union – what documents come with the shipment?
Each order ships with commercial invoice, packing list and a technical datasheet for customs clearance. Tell us if your market requires additional conformity documents and we will confirm what we can provide for your order.

Q3: Middle East & Africa – how does it cope with heat and contaminated oil?
Hydraulic pump life depends heavily on oil cleanliness. We recommend a new return filter and a flush before installation, and can quote a seal kit together with the pump. Ask us for the oil viscosity and service interval recommendation for your ambient temperature.

Q4: Southeast & South Asia – what is the minimum order and how do we talk price?
Minimum order is 1 unit and the price is negotiable – it depends on quantity, shipping mode and whether you consolidate this pump with other parts in one shipment. Send your target quantity and we will quote accordingly.

Q5: Russia & CIS – can it work in low temperature?
Yes, with the correct hydraulic oil grade. Tell us your winter ambient temperature and we will recommend the oil grade and warm-up procedure, and can quote a low-temperature seal option on request.

Q6: South America & Australia – lead time and after-sales?
Delivery is normally 15–30 days after order confirmation, and warranty terms and claim procedure are agreed with your sales contact before shipment, including how to submit photos or video of the test bench result for assessment.

Request a Quotation

Send us your machine model, the part number on the existing pump, the quantity required and your destination port. Our team will reply with pricing, warranty terms, stock status and shipping options – and if this pump is not the right one, we will quote an alternative from our range.