Main bearings, 129001-02931, AM875371, MB-9150, 129150-02800, 729150-02800, 6-07-100-21, Yanmar 3TNE84, Yanmar 4TNV88
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  • Main bearings, 129001-02931, AM875371, MB-9150, 129150-02800, 729150-02800, 6-07-100-21, Yanmar 3TNE84, Yanmar 4TNV88
  • Main bearings, 129001-02931, AM875371, MB-9150, 129150-02800, 729150-02800, 6-07-100-21, Yanmar 3TNE84, Yanmar 4TNV88
  • Main bearings, 129001-02931, AM875371, MB-9150, 129150-02800, 729150-02800, 6-07-100-21, Yanmar 3TNE84, Yanmar 4TNV88
  • Main bearings, 129001-02931, AM875371, MB-9150, 129150-02800, 729150-02800, 6-07-100-21, Yanmar 3TNE84, Yanmar 4TNV88

Main bearings / STD + 0.25 / Yanmar 3TNE84 / 4TNE84 / 3TNV88 / 4TNV88 / Yanmar EF352T / EF453T / F18 / F20 / F22 / F24

Product code: 6-07-100-21
Brand 4FARMER
Country of production 4FARMER
View other model
zł29.00
Includes VAT 23%

Lowest price from 30 days: zł29.00

Product description

Standard size crankshaft main bearings (STD + 0.25, so-called first grind bearings), 20 mm wide, 2.00 mm thick and with an inner diameter of approximately 51 mm for Yanmar tractors of the Yanmar EF352T, Yanmar EF453T, Yanmar F18, Yanmar F20, Yanmar F22, Yanmar F24, Yanmar FX24 , Yanmar 3TNE84, Yanmar 4TNE84 , Yanmar EF352T, Yanmar EF453T series with Yanmar 3TNV88, Yanmar 4TNV88 and other engines.

Main engine bearings are semicircular rings that are mounted in special grooves (holders) in the engine block, between the crankshaft (main shaft) and the engine block (applies to the central shaft journals) in order to eliminate play that occurs during engine operation. Main bearings, bearing the shaft, ensuring the proper position of the shaft relative to the engine block so that the generated power is transmitted as smoothly as possible.

Dimensions ;

  • inner diameter: 51 mm,
  • width: 20mm,
  • thickness: 2.00 mm,
  • original part numbers: 129001-02931,
  • reference numbers: AM875371, MB-9150, 129150-02800, 729150-02800,
  • part numbers: 6-07-100-21.

Tractor models:

Yanmar:

  • Yanmar EF352T,
  • Yanmar EF453T,
  • Yanmar F18,
  • Yanmar F20,
  • Yanmar F22,
  • Yanmar F24,
  • Yanmar FX24.

Engine models :

Yanmar:

  • Yanmar 3TNE84,
  • Yanmar 4TNE84,
  • Yanmar 3TNV88,
  • Yanmar 4TNV88.

The first signs of wear of the main bearings are an unnatural, steady knocking coming from the engine. Worn bearings must be replaced with new ones as soon as possible, replacing the faulty element too late can cause serious damage to the shaft, connecting rod or engine.

Magazine : M01:F73:S01

*Photos are for illustrative purposes only and may differ in detail from the delivered product due to differences in production over the years.

Specifications

Condition
New
Engine model
Yanmar 3TNV88

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Questions & Answers

Why is regular filter replacement (oil, air, fuel) crucial for a mini tractor?

User
Ekspert Traktor.com.pl – Doradca techniczny • 17.02.2026
Regular filter replacement is the easiest way to extend the life of an engine from brands like Kubota or Yanmar. The oil filter removes metallic contaminants generated during operation, the air filter protects the cylinders from field dust, and the fuel filter prevents water and dirt from damaging the precision injection system. We recommend replacing filters every 50-100 operating hours or at least once per season to ensure optimal engine performance.

How to properly select and sharpen mower blades for a Japanese tractor?

User
Ekspert Traktor.com.pl – Doradca techniczny • 17.02.2026
When selecting mower blades, consider the mower deck model and the blade length and center bore diameter. Maintaining blade balance is crucial when sharpening – an unbalanced blade causes vibrations that damage the hub bearings. Remember that sharp blades mean healthier grass, a cleaner cut, and less strain on the engine of your Iseki or Mitsubishi tractor.

How to identify the correct V-belt size and how to care for it?

User
Ekspert Traktor.com.pl – Doradca techniczny • 17.02.2026
It's best to read the markings on the side of the old V-belt. If they are illegible, measure the belt width and its outer length (La). On Shibaura and Hinomoto tractors, it's important to regularly check the belt tension – too loose a belt will cause slippage and faster wear, while too tight a belt can cause alternator or water pump bearing failure.

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