1. Product Overview

6732-21-3430 double row ball bearing is specially matched for Komatsu 102 series engines, manufactured fully compliant with OEM drawing dimensions. It adopts integrated double-row steel ball structure with double-sided red rubber seals, mainly installed on crankshaft and hydraulic pump transmission positions of excavator engines. Engines work under long-term high temperature, circulating engine oil and dusty construction environment. This bearing features excellent sealing performance to stably buffer alternating loads. No complicated engine disassembly is required during maintenance; only replacing this bearing can fix faults, greatly reducing excavator downtime.

2. Material & Processing Advantages

1. Bearing Body: Integrally forged from national standard GCr15 high-carbon chromium bearing steel with complete quenching and tempering heat treatment. Uniform hardness of steel balls and raceways delivers outstanding anti-fatigue and high-temperature pitting resistance for long-term engine high-temperature operation.
2. Double-Row Load Structure: Double rows of steel balls bear loads via line contact, offering much higher load capacity than single row ball bearings. It withstands combined radial and bidirectional axial thrust, adapting to complex loads generated by engine start-stop and high-speed rotation.
3. Double-Layer Red Seal Cover: Thickened oil-resistant rubber sealing ring with double-sided sealing design isolates engine oil leakage and external dust/silt ingress, preventing steel ball rust, jamming and premature wear failure for dusty construction machinery working conditions.
4. Precision Raceway Machining: Mirror super-finish grinding on inner and outer raceways ensures high surface smoothness, low running friction and temperature rise, avoiding high-temperature seizure during long-time high-speed operation.

3. Precision Grade Selection Guide

• P0: Standard general precision with high cost performance, suitable for daily earthwork and routine engine maintenance replacement of small and medium excavators
• P6: Tighter dimensional and raceway tolerance reduces vibration and heat generation, ideal for mining excavators working 24-hour non-stop heavy-duty construction
• P5: High-precision grade for complete engine overhaul and crankshaft transmission performance upgrade, with greatly improved concentricity and high-speed running stability

4. Quality & Installation Instruction

6732-21-3430 engine ball bearing is strictly produced to Komatsu OEM specifications. The complete bearing assembly can be directly installed on engine positions without extra accessories. Every finished product passes full inspection on bearing hardness, internal clearance, oil resistance of seals and dimensional tolerance before delivery. Custom P0/P6/P5 precision grades are available for bulk orders. Installation tips: 1. Thoroughly clean oil and impurities on engine mounting surface and shaft journal; 2. Press the bearing evenly, never strike the outer seal cover directly; 3. Fill matched engine lubricating oil after assembly; 4. Install and debug after confirming no oil leakage from seals.

5. Application Scenarios

Widely applied to engine repair of Komatsu excavators equipped with 4D102E, S6D102E, SAA4D102E, SAA6D102E engines, export wholesale of Komatsu construction machinery spare parts and regular engine maintenance of infrastructure & mining engineering fleets. It solves common failures of original bearings such as abnormal running noise, oil leakage from seals, steel ball pitting wear, crankshaft transmission shake and reduced engine power. Replacing only this bearing cuts the overall cost of full engine overhaul.