129900-32001 Oil Pump Assembly for Komatsu PC88MR & Yanmar VIO80

129900-32001 Oil Pump for Komatsu PC88MR and Yanmar VIO80

The 129900-32001 engine oil pump is supplied for compact excavator and industrial diesel engine lubrication system repair. It is commonly searched for Komatsu PC88MR, Yanmar VIO80 and small equipment using Yanmar 4TNV98, 4TNE98, 4TNE94 or 4TNV94 engine references.

This page focuses on 129900-32001 as the main part number. 12990032001 is the compact no-hyphen search format, while YM129900-32001, 129900-32000, 12990032000 and YM129900-32000 may appear as checking references in aftermarket listings. Final fitment should be confirmed by the old oil pump number, engine model, pump body shape, rotor height, mounting face and machine information before ordering.

Engine Application: Yanmar 4TNV98 4TNE98 4TNE94 4TNV94

For this product, the engine model is more reliable than the machine name alone. Yanmar 4TNV98, 4TNE98, 4TNE94 and 4TNV94 engines are used across compact excavators, small construction machines, industrial equipment and engine replacement markets. Buyers may search this oil pump by engine model when the old machine has been repaired, repowered or purchased second-hand.

The Yanmar 4TNV and 4TNE engine family has many similar lubrication parts, so this page should not only say “PC88MR oil pump” or “VIO80 oil pump.” The stronger SEO structure is to let the SEO Title cover Komatsu PC88MR and Yanmar VIO80 machine intent, while the H1 and body content clearly reinforce the Yanmar 4TNV98 / 4TNE98 engine direction.

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

Machine Application: Compact Excavator Repair

The main machine references on this page are Komatsu PC88MR and Yanmar VIO80. These are compact excavator application directions where buyers often need a small diesel engine oil pump after low oil pressure, lubrication failure or engine overhaul.

Some aftermarket references also connect 129900-32001 with Komatsu 4D94E, 4D94LE and 4D94LE-2 engine directions. These should be treated as application references, not as the only fitment proof.

Compact machines often have a long service life and may have previous rebuild history. The removed oil pump, engine nameplate and pump mounting details are more reliable than model name alone.

Part Number and Cross Reference Notes

129900-32001 is the main part number of this page. The compact format 12990032001 should be used for search coverage, but it should not replace the original hyphenated part number as the main page signal.

YM129900-32001 is a common Yanmar-style reference for the same part direction. 129900-32000, 12990032000 and YM129900-32000 may appear as earlier or related checking references in aftermarket listings. These numbers are useful for buyer search coverage, but the old pump should still be checked before ordering.

Avoid mixing unrelated Yanmar starter numbers, fuel pump numbers or oil pumps for different engine families into this page. The page should stay focused on 129900-32001, 12990032001, Yanmar 4TNV98, 4TNE98, 4TNE94 and 4TNV94 engine oil pump demand.

How to Confirm the Correct 129900-32001 Oil Pump

Small Yanmar oil pumps can look very similar, but the rotor height, pump body shape, gear side and mounting details may differ. Before ordering, compare the removed oil pump carefully.

• Confirm whether the old oil pump number is 129900-32001, 12990032001 or a listed checking reference.

• Check whether the engine model is Yanmar 4TNV98, 4TNE98, 4TNE94 or 4TNV94.

• Compare the pump body shape, rotor section and gear side with the removed pump.

• 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 Rotor Height and Timing Cover Fitment Matter

Unlike some larger external oil pump assemblies, many Yanmar compact engine oil pumps are closely matched to the timing cover and internal lubrication passage design. A pump with a similar outside shape may still have a different rotor height, body thickness or passage position.

For this reason, repair shops should compare the removed pump from the gear side and mounting side, not only the front view. If the old pump is already removed, photos of the timing cover area can also help confirm the correct replacement direction.

If the machine has suffered low oil pressure before, check whether the pump itself is worn or whether the real cause comes from sludge, worn bearings, oil pickup blockage or incorrect oil viscosity.

Common Oil Pump Failure Symptoms

An engine oil pump may need replacement when the engine shows low oil pressure, oil pressure warning, abnormal bearing noise, poor lubrication, overheating, metal particles in engine oil or serious wear after long-term operation.

On compact excavators, oil pump problems may first appear as unstable lubrication after startup, warning light issues, abnormal mechanical noise, or engine damage after working under load. These symptoms should be checked together with engine oil condition and oil filter 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 129900-32001 replacement oil pump, check the complete lubrication system. This helps avoid replacing the pump when the root cause is oil contamination or engine wear.

• 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 rotor area, 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 Compact Excavator Repair

For repair shops, this 129900-32001 engine oil pump is suitable for compact excavator and Yanmar 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 small diesel engine service demand.

Topvelsun supports small repair orders and bulk inquiries. To improve quotation accuracy, 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 129900-32001 engine oil pump used for Yanmar 4TNV98, 4TNE98, 4TNE94 and 4TNV94 engine lubrication system repair.

Is 12990032001 the same search reference as 129900-32001?

12990032001 is the no-hyphen writing format of 129900-32001. The main part number of this page should remain 129900-32001, and the removed oil pump should still be checked before ordering.

Can 129900-32000 be used as a reference?

129900-32000 and 12990032000 may appear as related checking references in aftermarket listings. Final fitment should be confirmed by the old pump, engine model and pump physical configuration.

Which engine models are the main references?

The main engine references are Yanmar 4TNV98, 4TNE98, 4TNE94 and 4TNV94. Some references may also mention Komatsu 4D94E and 4D94LE engine directions.

Which machines can be used as references?

This page uses Komatsu PC88MR and Yanmar VIO80 as compact excavator application references. Final confirmation should be based on the actual engine model and removed oil pump.

What should I check before ordering?

Please check the old oil pump number, engine model, pump body shape, rotor section, 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.