Hydraulic Pump 564 9803 5649803 Fits For Caterpillar E336 336 345 395 3ead6991 7511 4f9e ad0f 1c13ad71bff5.jpg

564-9803 5649803 Hydraulic Pump for Caterpillar E336 336 345 395

For Caterpillar 427E backhoes: an aftermarket new hydraulic pump, part number 398-7471 that is the heart of the hydraulic system, turning engine rotation into pressurized oil.

Category: Hydraulic Pump Assembly

Description
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398-7471 Hydraulic Pump is an aftermarket replacement hydraulic pump for Caterpillar backhoes, including 427E. The main hydraulic pump converts engine power into pressurized oil flow. Supplied by LIONKITS as new, aftermarket, part number: 398-7471, 3987471.

398-7471 Hydraulic Pump Specifications

Product Type: Hydraulic Pump
Part Number: 398-7471, 3987471
Compatible Brand: Caterpillar
Machine Type: Backhoe
Condition: new, aftermarket, Part number: 398-7471, 3987471
Country of Origin: China

Caterpillar Models Compatible with the 398-7471 Hydraulic Pump

Fits for Caterpillar Backhoe 427E

Your model is not listed? Contact LIONKITS via live chat or email with your machine model and nameplate photo, and we will confirm compatibility.

What Does a Hydraulic Pump Do?

The main hydraulic pump converts engine power into pressurized oil flow. That oil moves the boom, arm, bucket, swing and travel functions, so every machine movement depends on it. Because it takes the most punishment, it is usually the first major hydraulic component to wear out.

Signs the Part Needs Replacing

Slow or weak movement on all functions: when everything is slow at once, not just one circuit, the pump is the most likely source.
Whining, knocking or grinding noise: internal wear or cavitation, especially on start-up or when the oil is cold.
Hydraulic oil running hot: internal bypass leakage turns pressure into heat.
Metal particles in the filter or case drain: a failing pump sheds metal and pushes out more case drain flow.
Erratic or spongy movement, foamy oil: air entering the suction line, or aeration, upsets pump flow.

These symptoms overlap with clogged filters, low oil, air in the suction line and worn valves, so check the filters and oil level before replacing the part.

How to Order and Install the 398-7471 Hydraulic Pump

Confirm your machine model, the part number and the pump model on your existing pump before ordering.
Send a photo of the old pump or the nameplate if you are not sure; LIONKITS will confirm fitment for you.
Change the hydraulic oil and the return filters before fitting the new pump; a new pump installed in contaminated oil will fail early.
If the old pump failed internally and shed metal, flush the tank, hoses and oil cooler and inspect the control valve and motors for contamination.
Fill the pump case with clean hydraulic oil and prime the pump as the service manual specifies before the first start.
Check the suction line, strainer and fittings for air leaks, and tighten bolts to the specified torque.
Run the machine at low speed first, then check pressure, noise and leaks.

Frequently Asked Questions

What is the 398-7471 Hydraulic Pump?

The 398-7471 Hydraulic Pump is an aftermarket replacement hydraulic pump for Caterpillar backhoes, supplied as new, aftermarket, part number: 398-7471, 3987471 under part numbers 398-7471, 3987471.

Which Caterpillar models does the 398-7471 Hydraulic Pump fit?

It is listed for 427E. If you are unsure, send your machine nameplate to LIONKITS for confirmation.

How do I know my hydraulic pump is failing?

Typical signs are slow or weak movement on all functions, whining or knocking noise, hot hydraulic oil, metal particles in the filter or case drain and erratic or spongy movement.