CAT 077-8727 BEARING

CAT 077-8727 is a Caterpillar genuine single-row deep groove ball bearing (pure original factory information, no additional description), used for radial support and low axial load bearing in small to medium-sized power and transmission components. It is suitable for low to medium speed and light to medium load conditions, and is installed via an interference fit inner ring and an transition fit outer ring. It can withstand small bidirectional axial forces (Cat®…).

Core Parameters and Information

Item Details
Part Model: CAT 077-8727 (0778727) Single-Row Deep Groove Ball Bearing

Structure Type: With cage, double-sided stamped steel dust cover, non-contact seal, outer ring without flange, inner ring with locking ring

Material: Bearing steel (GCr15), conforming to ASTM A295 standard, cage is SPCC steel plate, dust cover is tin-plated steel plate

Key Dimensions: Inner diameter 30 mm, outer diameter 62 mm, width 16 mm, chamfer 1 mm, ball diameter 8 mm, number of balls 9

Performance Parameters: Rated dynamic load 13.2 kN, rated static load 6.8 kN, limiting speed (grease lubrication) 8500 rpm, operating temperature -40℃ to +120℃, radial clearance C3 group

Compatibility Standard: Conforms to CAT MES J5103 Bearing specifications: Compliant with ISO 6005 deep groove ball bearing standard, sealing rating IP54.
Match relationship: Inner ring interference fit with shaft (fit tolerance φ30 H7/k6), outer ring transition fit with housing (fit tolerance φ62 J7/h6), used for radial support of fan drive shafts, water pump shafts, generator shafts, etc.

Compatible models and application scenarios:
Compatible equipment: CAT 306/307 mini excavators, 242B/246B skid steer loaders, 3044/3054 engines, C3.4 engine cooling systems, hydraulic pump drive shafts, etc.

Application scenarios: Fan drive shaft support, water pump shaft bearings, generator bearings, hydraulic pump drive shaft support, etc., especially suitable for power transmission systems requiring low friction and high speed.

Installation Instructions: The inner ring is heat-fitted or press-fitted onto the shaft, and the outer ring is installed into the housing. It is used in conjunction with the 077-8717 bearing retainer and the 077-8701 retainer. After installation, the axial clearance should be ≤0.1 mm.

Installation and Maintenance Points: Clean the shaft, housing, and bearing. Check that the bearing is undamaged, the dust cover is intact, and that the shaft and housing dimensions meet the required tolerances.

Heat the inner ring to 80-100℃ and heat-fit it onto the shaft, or press-fit it using a press machine. Avoid directly striking the bearing. Install the outer ring into the housing, ensuring it is properly seated.

Post-Installation Inspection: The bearing should rotate freely without jamming, with no radial looseness, no significant axial movement, and no leaks at the seals.

Maintenance: Check the bearing temperature and for abnormal noise every 1000 hours. Replace the bearing if the temperature is abnormal or abnormal noise is present. Regularly replenish the grease (lithium-based grease, NLGI 2 grade) to extend its service life.