129407-32000 129001-32001 Oil Pump Ass'y for Yanmar VIO45 Komatsu PC50

129407-32000 Oil Pump for Yanmar VIO45 and Komatsu PC50

The 129407-32000 / 129001-32001 engine oil pump is supplied for compact equipment engine lubrication system repair. It is commonly searched for Yanmar VIO45, Komatsu PC50 and small equipment using Yanmar 4TNE84, 4TNV84 or Komatsu 4D84E engine references.

This page focuses on 129407-32000 and 129001-32001 as the main part numbers. YM129407-32000, YM129001-32001, 12940732000 and 12900132001 can be used as checking references. Final fitment should be confirmed by the old oil pump number, engine model, pump gear side, mounting face, oil passage layout and machine information before ordering.

Engine Application: Yanmar 4TNE84, 4TNV84 and Komatsu 4D84E

For this oil pump page, the engine model is more reliable than the machine model alone. Yanmar 4TNE84 and 4TNV84 engines are widely used in compact excavators, small loaders, utility equipment and industrial diesel applications. Komatsu 4D84E is also commonly connected with this oil pump direction in aftermarket listings.

The SEO Title should cover Yanmar VIO45 and Komatsu PC50 machine search intent, while the H1 should reinforce the engine search path around Yanmar 4TNE84 and related compact diesel engine applications. This structure helps the page reach both buyers who search by machine model and buyers who search by engine model or old pump number.

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

Machine Reference for Compact Equipment Repair

The current product page uses Yanmar VIO45 and Komatsu PC50 as its main machine references. Public aftermarket references for the same oil pump direction may also mention PC45MR, PC50MR, PC50UU, WA50-6, VIO50 and VIO55, depending on engine version and market configuration.

These model names should be treated as application references, not as the only fitment proof. Compact excavators and loaders often have long service life, previous rebuild history or replacement engines, so the old oil pump and engine nameplate are more important than model name alone.

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

Part Number and Reference Notes

129407-32000 and 129001-32001 are the main part number directions for this product page. The compact formats 12940732000 and 12900132001 should be included for search coverage, but they should not replace the original hyphenated part numbers as the main page signal.

YM129407-32000 and YM129001-32001 are common Yanmar-style references for this oil pump direction. Some listings may show nearby numbers such as 129407-32001 or 129001-32002, but those should not be placed in the top parameter area unless the old pump or supplier data confirms interchange.

This page should stay focused on 129407-32000, 129001-32001, Yanmar 4TNE84, Yanmar 4TNV84 and Komatsu 4D84E. Avoid turning it into a general Yanmar oil pump catalog, because that would dilute the main part number and make fitment less clear for buyers.

How to Confirm the Correct 129407-32000 Oil Pump

Small Yanmar oil pumps can look similar, but the gear side, body thickness, oil passage position and bolt hole layout may differ. Before ordering, compare the removed pump carefully.

• Confirm whether the old oil pump number is 129407-32000, 129001-32001 or a listed checking reference.

• Check whether the engine model is Yanmar 4TNE84, 4TNV84 or Komatsu 4D84E.

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

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

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

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

Why Gear Count and Pump Face Matching Matter

For this type of compact diesel engine oil pump, the gear side is one of the most important checking points. Some market references for the 129407-32000 direction mention a 29-tooth oil pump design, but buyers should still compare the removed pump instead of relying only on the part number.

The mounting face and timing cover fitment area must match the engine. A similar front view does not always guarantee correct installation, because oil passage position, body thickness, gear height or bolt hole alignment may be different.

For repair shops, the best confirmation method is to provide photos of both sides of the removed oil pump. If the pump has already been removed, photos of the engine timing cover area can also help reduce wrong-part risk.

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, overheating, metal particles in engine oil or serious internal engine wear.

On compact excavators and small loaders, oil pump problems may appear after long work cycles, dusty jobsite operation, poor oil maintenance or engine overheating. The oil pump should be checked together with the oil filter, oil strainer, pickup tube and bearing condition.

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 129407-32000 / 129001-32001 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 cover 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 129407-32000 / 129001-32001 oil pump is suitable for compact excavator and small equipment 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 Yanmar 4TNE84, Komatsu 4D84E and compact 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 129407-32000 / 129001-32001 engine oil pump used for Yanmar 4TNE84, Yanmar 4TNV84 and Komatsu 4D84E engine lubrication system repair.

Is 12940732000 the same search reference as 129407-32000?

12940732000 is the no-hyphen writing format of 129407-32000. The main part number should remain 129407-32000, and the removed oil pump should still be checked before ordering.

Can 129001-32001 be used as a reference for this oil pump?

Yes. 129001-32001 and 12900132001 appear together with 129407-32000 in aftermarket references for this Yanmar and Komatsu compact engine oil pump direction. Final fitment should still be confirmed by the old pump.

Which engine models are the main references?

The main engine references are Yanmar 4TNE84, Yanmar 4TNV84 and Komatsu 4D84E. Some market references may also mention related 3TNE84, 3TNE88, 4TNE88 or 4TNV88 engine directions, but the old pump should be checked before ordering.

Which machines can be used as references?

This page uses Yanmar VIO45 and Komatsu PC50 as the main page references. Other compact equipment references may include PC45MR, PC50MR, PC50UU, WA50-6, VIO50 and VIO55 depending on engine configuration.

What should I check before ordering?

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

What can cause repeated oil pump or low oil pressure problems?

Repeated problems may be caused by dirty engine oil, clogged oil strainer, blocked oil passages, worn bearings, pressure relief valve faults, sludge in the oil pan or installing a new pump without cleaning the lubrication system.