Hydraulic Pump 455 7978 4557978 Fits For Caterpillar 434F2 427F2 428F2 01ce25c0 5249 4711 b334 9af1dd2da942.jpg

455-7978 4557978 Hydraulic Pump for Caterpillar 434F2 427F2 428F2

For Caterpillar 426, 436 and 438: an aftermarket new hydraulic pump, part number 6E-0838 that supplies the oil flow and pressure the machine hydraulics work with.

Category: Hydraulic Pump Assembly

Description
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6E-0838 Hydraulic Pump is an aftermarket replacement hydraulic pump for Caterpillar, including 426, 436, 438. The main hydraulic pump converts engine power into pressurized oil flow. Supplied by LIONKITS as new, aftermarket, part number: 6e-0838, 6e0838.

6E-0838 Hydraulic Pump Specifications

Product Type: Hydraulic Pump
Part Number: 6E-0838, 6E0838
Compatible Brand: Caterpillar
Condition: new, aftermarket, Part number: 6E-0838, 6E0838
Country of Origin: China

Caterpillar Models Compatible with the 6E-0838 Hydraulic Pump

Fitments: 426 BACKHOE LOADER 7BC01878-03476 (MACHINE) POWERED BY D4.236 ENGINE

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 6E-0838 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 6E-0838 Hydraulic Pump?

The 6E-0838 Hydraulic Pump is an aftermarket replacement hydraulic pump for Caterpillar , supplied as new, aftermarket, part number: 6e-0838, 6e0838 under part numbers 6E-0838, 6E0838.

Which Caterpillar models does the 6E-0838 Hydraulic Pump fit?

It is listed for 426, 436, 438. 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.