6151-51-1005 Oil Pump Assembly for Komatsu PC400-6 & WA470

6151-51-1005 Oil Pump for Komatsu PC400-6 and WA470

The 6151-51-1005 engine oil pump is supplied for Komatsu heavy equipment engine lubrication system repair. It is commonly searched as 6151-51-1005, 6151511005, engine oil pump, oil pump assembly or lubrication oil pump for Komatsu PC400-6, PC400LC-6, WA470 and related equipment using Komatsu 6D125, S6D125 or SAA6D125 engine references.

This page focuses on 6151-51-1005 as the main part number. 6151511005 is the compact no-hyphen writing format, while 6154-51-1000, 6251-51-1001 and 6251-51-1005 may appear as checking references in Komatsu 6D125 oil pump listings. Final fitment should be confirmed by the old oil pump number, engine model, gear side, pump housing, mounting face and machine information before ordering.

Engine Application: Komatsu 6D125, S6D125 and SAA6D125

For this product page, the engine model is the strongest confirmation point. Komatsu 6D125, S6D125 and SAA6D125 engines are used in larger excavators, wheel loaders, dozers and heavy-duty equipment, so buyers may search by either machine model or engine model during repair.

The SEO Title should cover Komatsu PC400-6 and WA470 machine search intent, while the H1 should reinforce the Komatsu 6D125 / S6D125 engine search path. This structure gives the page broader search coverage without turning it into a general Komatsu oil pump catalog.

If the buyer only provides the machine model, ask for the engine nameplate and old oil pump photos. If the buyer only provides the engine model, confirm the removed pump number and physical pump details before quotation.

Machine Reference for PC400 and WA470 Equipment

The main machine references for this page are Komatsu PC400-6 and WA470. Public market references may also mention PC400LC-5, PC400LC-6, WA450-3MC, WA470-3 and other equipment using Komatsu 6D125 or S6D125 engine directions.

These model names should be treated as application references, not as the only fitment proof. Large Komatsu machines often have long service hours, previous overhaul history, replacement engines or non-original oil pump changes.

For accurate ordering, compare the removed oil pump with the replacement unit before shipment. Photos of the pump gear side, body housing, mounting face, oil passage area, old part number and engine nameplate are useful for confirmation.

Part Number and Cross Reference Notes

6151-51-1005 is the main part number of this product page. The compact format 6151511005 should be included for search coverage, but it should not replace the original hyphenated part number as the main page signal.

6154-51-1000, 6251-51-1001 and 6251-51-1005 can be used as checking references for this Komatsu 6D125 oil pump direction. These references are useful for buyer matching, but the removed pump and engine information should still be checked before shipment.

I do not recommend placing every nearby number such as 6151-51-1002, 6151-51-1004 or 6251-51-1000 in the top parameter area unless your supplier or old pump confirms interchange. Too many references can dilute the 6151-51-1005 page signal and increase wrong-part inquiries.

How to Confirm the Correct 6151-51-1005 Oil Pump

Komatsu 6D125 oil pumps can look similar from the outside, but the gear side, pump housing, bolt hole layout and oil passage design may differ. Before ordering, compare the removed pump carefully.

• Confirm whether the old oil pump number is 6151-51-1005, 6151511005 or a listed checking reference.

• Check whether the engine model is Komatsu 6D125, S6D125 or SAA6D125.

• Compare the pump gear side, housing shape and mounting face.

• Check oil inlet, oil outlet and internal oil passage positions.

• Confirm gasket surface, bolt hole pattern and timing gear fitment area.

• Send machine model, engine nameplate and old oil pump photos before quotation if you are not sure.

Why Heavy Equipment Oil Pump Matching Requires Extra Care

For large machines such as PC400 and WA470, the oil pump supports lubrication for heavy-load engine operation. A wrong oil pump version may affect oil passage alignment, gear engagement or installation clearance, even when the engine family looks similar.

Repair shops should provide photos of both sides of the removed oil pump. The gear-side view, mounting face, bolt hole layout and oil passage area are more useful than a single front image.

This checking process is especially important for older machines, rebuilt engines and export equipment, because previous maintenance may have changed the engine configuration or installed a different oil pump version.

Common Oil Pump Failure Symptoms

An engine oil pump may need replacement when the machine shows low oil pressure, oil pressure warning, unstable lubrication after startup, abnormal bearing noise, turbocharger lubrication problems, engine overheating, metal particles in engine oil or serious internal engine wear.

On PC400 and WA470 class machines, low oil pressure may appear after long work cycles, heavy loading, poor oil maintenance, overheating, dust contamination, oil sludge buildup or internal bearing wear. The oil pump should be checked together with the complete lubrication system.

These symptoms are not always caused by the oil pump itself. Blocked oil passages, dirty engine oil, worn bearings, damaged pickup tube, clogged strainer, pressure relief valve problems or incorrect engine oil viscosity can create similar problems.

Troubleshooting Before Replacement

Before ordering a 6151-51-1005 replacement oil pump, check the lubrication system and the real reason for low oil pressure. This helps avoid replacing the pump when the root cause is oil contamination, bearing wear or blockage.

• Check engine oil level, oil grade and oil contamination.

• Inspect the oil filter, oil strainer and pickup tube condition.

• Check whether sludge or metal particles are present in the oil pan.

• Inspect crankshaft bearings, camshaft bearings and related lubrication surfaces.

• Confirm whether the pressure relief valve is stuck, worn or contaminated.

• Clean the oil circuit if the old pump failed due to contamination, sludge or engine wear.

Installation and Maintenance Notes

Before installation, clean the timing gear area, mounting surface and oil passages. Compare the replacement pump with the removed unit, including gear position, pump body shape, bolt holes and gasket surface.

Use a proper gasket or sealing method according to the engine repair requirement. After installation, check oil pressure during startup and confirm that oil circulates normally before putting the engine under load.

For longer service life, use clean engine oil, replace filters on time and avoid running the engine with low oil pressure. If the previous failure was caused by sludge, bearing wear or contamination, those causes should be corrected during repair.

Buying Notes for Repair Shops and Parts Distributors

For repair shops, this 6151-51-1005 engine oil pump is suitable for Komatsu 6D125 / S6D125 engine lubrication repair when the old pump is worn, damaged or unable to maintain stable oil pressure.

For parts distributors, it can be supplied as a replacement oil pump reference for Komatsu PC400-6, PC400LC-6, WA470 and related heavy equipment service demand. Topvelsun supports small repair orders and bulk inquiries. Please send the required quantity, old pump number, engine model, machine model and photos of the old oil pump from multiple angles.

FAQ

What is the main product on this page?

This page is for the 6151-51-1005 engine oil pump used for Komatsu 6D125, S6D125 and SAA6D125 engine lubrication system repair.

Is 6151511005 the same search reference as 6151-51-1005?

6151511005 is the compact no-hyphen writing format of 6151-51-1005. The main part number of this page should remain 6151-51-1005, and the removed oil pump should still be checked before ordering.

Can 6154-51-1000 be used as a cross reference?

6154-51-1000 may appear as a checking reference for this Komatsu 6D125 oil pump direction. Final fitment should still be confirmed by the old pump number, engine model and physical pump configuration.

Can 6251-51-1001 or 6251-51-1005 be used as references?

Yes, they can be used as checking references in Komatsu 6D125 / SAA6D125 oil pump listings. They should not replace 6151-51-1005 as the main part number of this page.

Which engine models are the main references?

The main engine references are Komatsu 6D125, S6D125 and SAA6D125. Final confirmation should be based on the removed oil pump, engine nameplate and pump physical configuration.

Which machine models can be used as references?

The main page references are Komatsu PC400-6 and WA470. Other references may include PC400LC-5, PC400LC-6, WA450-3MC and WA470-3 when the old pump number and engine configuration match.

What should I check before ordering?

Please check the old oil pump number, engine model, pump housing, gear side, mounting face, bolt hole pattern and oil passage position. Clear photos of the removed pump are recommended.