07433-71803 Hydraulic Pump Compatible With Komatsu D155C-1 D155C-1D

07433-71803 / 0743371803 Hydraulic Pump for Komatsu D155C Pipelayer

This 07433-71803 / 0743371803 hydraulic pump is supplied for Komatsu pipelayer applications. Public parts references commonly list this pump for Komatsu D155C-1 and D155C-1D, with engine references including S6D155-4 and SA6D140-2.

Some parts references describe 07433-71803 as a hydraulic pump, while other listings identify it as a transmission pump or pump assembly. Because the exact function and fitment can vary by machine configuration, please verify the original pump number, ports, mounting face, shaft and machine serial number before ordering.

Application and Fitment Reference

• Primary Part Number: 07433-71803 / 0743371803

• Product Type: Hydraulic Pump / Transmission Pump Ass’y

• Machine Category: Komatsu Pipelayer

• Compatible Model References: D155C-1, D155C-1D

• Engine References: S6D155-4, SA6D140-2

• Supply Type: Genuine, OEM, or aftermarket supply may be available depending on current stock.

Common Symptoms That May Require Pump Inspection

• Weak hydraulic or transmission response: related machine functions respond slowly or inconsistently.

• Pressure loss: the system cannot maintain stable pressure during operation.

• Oil leakage: visible leakage around the pump body, ports, shaft seal or mounting area.

• Abnormal pump noise: whining, vibration or cavitation-like sound during operation.

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• Oil contamination: dirty oil or metal particles may accelerate internal pump wear.

Fitment Check Before Ordering

Before ordering this Komatsu 07433-71803 pump, please compare it with your original unit. Important confirmation points include the original part number, pump body shape, shaft type, port layout, hydraulic line connection, mounting face and machine serial number.

For faster confirmation, please send clear photos of the old pump nameplate, shaft, ports, mounting face and machine model plate. This helps reduce wrong orders and confirms whether 07433-71803 / 0743371803 is suitable for your Komatsu D155C pipelayer.

Installation and Maintenance Notes

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

• Inspect hydraulic or transmission oil condition and replace filters if contamination is found.

• Protect all pump ports from dust, water and metal particles during installation.

• Check shaft, port and mounting alignment before tightening lines and fasteners.

• After installation, run the machine at low speed first and check for leakage, abnormal noise and pressure instability.

Ordering Information

Topvelsun supplies hydraulic pumps, transmission pumps and pump assemblies for Komatsu, Caterpillar, Hitachi, Hyundai, Kobelco and other construction equipment. For this 07433-71803 pump, please provide your machine model, serial number, original pump number and photos before quotation.

FAQ

Is 07433-71803 used for Komatsu excavators?

Public references mainly list 07433-71803 / 0743371803 for Komatsu D155C-1 and D155C-1D pipelayers. It should not be described mainly as an excavator pump unless your original pump number and machine configuration confirm the fitment.

What is the relationship between 07433-71803 and 0743371803?

0743371803 is the non-hyphen writing format of 07433-71803. Both formats are commonly used in supplier listings and parts searches.

Which Komatsu machines are commonly listed for this pump?

Common public references include Komatsu D155C-1 and D155C-1D pipelayers. Engine references commonly include S6D155-4 and SA6D140-2. Final fitment should be verified by original pump number and machine serial number.

Is this a genuine or aftermarket pump?

Supply type may vary by inventory. Genuine, OEM, or aftermarket options may be available depending on stock. Please confirm the current supply type before ordering.

What should I send for confirmation?

Please send the machine model, serial number, original pump number, pump nameplate photo, shaft photo, port layout photo and mounting face photo.