Hydraulic Pump AP2D28 TP2D28 Fits for Komatsu Crawler Dozer D85EX 15EO D155A 5 6bdb8326 642d 473a b038 75e5ea72cb8f.jpg

AP2D28 TP2D28 Hydraulic Pump for Komatsu D85EX-15EO D155A-5 Crawler Dozer

This hydraulic main pump is listed for Hyundai R60-7 and R55-7 excavators, part number 31M8-10020. It supplies the oil flow and pressure the machine hydraulics work with. Unit weight is about 6 kg.

Category: Hydraulic Pump Assembly

Description
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31M8-10020 Hydraulic Main Pump is a replacement hydraulic main pump for Hyundai excavators, including R60-7, R55-7. The main hydraulic pump converts engine power into pressurized oil flow. Supplied by LIONKITS as genuine new.

31M8-10020 Hydraulic Main Pump Specifications

Product Type: Hydraulic Main Pump
Part Number: 31M8-10020
Compatible Brand: Hyundai
Machine Type: Excavator
Condition: Genuine new
Product Weight: 6.000 kg/13.23 pounds(1 piece)
Package Dimensions: 14.17 inch(L) x 10.24 inch(W) x7.87 inch(H)
Brand: LIONKITS
Country of Origin: China

Hyundai Models Compatible with the 31M8-10020 Hydraulic Main Pump

Hyundai Excavator R60-7 R55-7

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 31M8-10020 Hydraulic Main 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.

Shipping, Payment and Support

Dispatch and delivery: Your package will be sent within 2-3 business days, and another 3-7 business days to arrive in your country
Payment methods: Credit Card, PayPal, T/T, Western Union
Returns and refunds: If you encounter any issues with the product, please contact us promptly and provide detailed feedback. We will handle the return or exchange promptly

Frequently Asked Questions

What is the 31M8-10020 Hydraulic Main Pump?

The 31M8-10020 Hydraulic Main Pump is a replacement hydraulic main pump for Hyundai excavators, supplied as genuine new under part number 31M8-10020.

Which Hyundai models does the 31M8-10020 Hydraulic Main Pump fit?

It is listed for R60-7, R55-7. 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.