31E9-03010 31E9-03020 K3V140DT Hydraulic Main Pump for Hyundai R290LC-3丨Hyundai Excavator R290LC

31E9-03010 K3V140DT Hydraulic Main Pump for Hyundai R290LC-3

The 31E9-03010 / 31E903010 hydraulic main pump is used for Hyundai R290 series excavator hydraulic system applications. Public parts references commonly list this pump for R290LC-3, R290LC-3H and R290LC machines.

This pump is commonly associated with the K3V140DT pump family. It should be selected by the original pump nameplate and physical configuration, not by model name alone. Hyundai R290 series excavators may vary by production version, machine serial number, regulator type, hydraulic control configuration and previous repair history.

Cross Reference Numbers

Common reference numbers may include 31E9-03010, 31E903010, 11E9-1501, K3V140DT, K3V140DT-112R and K3V140DT-1R2R.

Related public references may also include 31E9-03020 and 31E903020. These numbers should be treated as reference information only. Hydraulic main pumps with similar numbers may still differ in regulator arrangement, solenoid connectors, drive shaft, mounting face, inlet and outlet ports, case drain position or control configuration.

Application and Fitment Reference

This Hyundai 31E9-03010 hydraulic main pump is mainly referenced for R290LC-3, R290LC-3H and R290LC. Some public references also mention R290LC-3LL, R290LC-3RB and R2800K applications.

The model list should be used as a fitment reference, not a universal guarantee. Before purchase, compare the old pump label, pump code, regulator position, solenoid connector, shaft type, mounting face, inlet and outlet ports, case drain position and machine serial number.

Technical Notes

Some hydraulic pump references list this pump with a working pressure around 340 bar and peak pressure around 390 bar. These values should be used as catalog references only. Actual service pressure and adjustment should follow the machine service procedure and the condition of the hydraulic system.

Common Failure Symptoms

• Slow hydraulic movement: boom, arm, bucket, swing or travel functions respond slowly under load.

• Weak digging force: the excavator cannot maintain stable hydraulic pressure during heavy operation.

• Machine speed drops during combined movements: pump output, regulator control and pilot pressure should be checked.

• Abnormal pump noise: whining, vibration or cavitation-like sound may indicate air entry, suction restriction, oil contamination or internal wear.

• Hydraulic oil overheating: worn pump components, blocked filters, restricted oil flow or relief valve problems may increase oil temperature.

• Metal particles in oil or filters: internal pump wear or system contamination should be investigated before installing a replacement pump.

Troubleshooting Before Replacement

• Check hydraulic oil level, oil condition and contamination.

• Inspect suction lines, return lines, case drain lines and hydraulic filters.

• Check for air entry, loose fittings, damaged hoses or restricted suction flow.

• Measure main pump pressure, pilot pressure and case drain flow according to the machine service procedure.

• Inspect pump regulators, electrical connectors, pressure sensors and pilot control signals.

• Check the main control valve, relief valves and cylinders if pressure loss or slow movement remains unclear.

• Compare the old pump nameplate and physical configuration before confirming the replacement pump.

Installation and Maintenance Notes

• Clean the pump mounting area and hydraulic line connections before removal.

• Cap all open hydraulic lines and pump ports to prevent dust, water and metal particles from entering the system.

• Inspect or replace hydraulic filters before installing the replacement pump.

• Flush the hydraulic system if metal particles, burnt oil or severe contamination are found.

• Pre-fill or lubricate the pump according to the service procedure before first startup.

• Check shaft engagement, mounting alignment, port direction and hose routing before tightening all lines.

• Start the engine at low speed first and check for leakage, abnormal noise, unstable pressure and excessive case drain flow.

• Do not operate the excavator under heavy load until oil flow, pressure, temperature and machine response are confirmed normal.

Fitment Check Before Ordering

To reduce wrong orders, please send the machine model, machine serial number, old pump nameplate photo, full pump view, regulator photo, solenoid connector photo, shaft photo, mounting face photo and hydraulic port layout photo before quotation.

FAQ

Is 31E9-03010 a Hyundai R290LC-3 hydraulic main pump?

Yes. Public parts references commonly list 31E9-03010 as a main hydraulic pump for Hyundai R290LC-3, R290LC-3H and R290LC excavator applications. Final confirmation should be made by the original pump nameplate and machine serial number.

What is the relationship between 31E9-03010 and K3V140DT?

31E9-03010 is the Hyundai part number, while K3V140DT is the pump model or pump family reference commonly associated with this main pump. Some references also list K3V140DT-112R and K3V140DT-1R2R as main pump unit references.

Can 31E9-03020 replace 31E9-03010?

31E9-03020 appears in some public references related to R290LC / R290LC-3 hydraulic pumps, but it should be treated as a related reference rather than an automatic replacement. The old pump label, regulator, ports, shaft and mounting face should be compared before ordering.

What other reference numbers may appear?

Related reference numbers may include 31E903010, 11E9-1501, K3V140DT, K3V140DT-112R, K3V140DT-1R2R, 31E9-03020 and 31E903020.

What should be checked before ordering?

Please check the old pump number, K3V140DT code, regulator type, solenoid connector, drive shaft, mounting face, hydraulic port layout, case drain position and machine serial number. Clear photos of the old pump are recommended.