177-4149: Bearing – Cup(Debris Resistant)

Cat 177-4149 is a chip-resistant bearing outer ring designed by Caterpillar specifically for gearboxes/torque converters. It is suitable for heavy-duty equipment drive systems and its core function is to protect the bearing from internal contaminants, ensuring stable operation under harsh conditions. Key information is as follows:

Core Parameters
Item Details
Type: Chip-resistant cylindrical roller bearing outer ring (suitable for gearboxes/torque converters; forms a complete bearing with the inner ring, rollers, and cage; outer ring can be replaced separately). It absorbs radial loads and isolates metal debris generated by gear wear. Suitable for heavy-duty, dusty environments. Cat® Parts
Compatible Models: Cat 966K/L/M, 972K/L/M loaders, D10T/R bulldozers, 773E/F mining trucks, etc. Suitable for power shift gearboxes and torque converter assemblies for Cat C15 and C18 engines. Used for outer ring replacement during gearbox/torque converter overhauls.

Materials and Manufacturing Processes Material: High-carbon chromium bearing steel (GCr15), integrally quenched + low-temperature tempered, hardness HRC60-64; Surface: Special wear-resistant coating to enhance resistance to chip scratches; Edges: Rounded corners to prevent damage to seals during installation; Precision: P6 grade to ensure compatibility with bearing housings.

Key Dimensions: Inner diameter 140mm (5.512 inches), outer diameter 220mm (8.661 inches), width 38mm (1.496 inches), weight approx. 2.9kg (6.39 lbs), compatible bearing housing installation tolerance H7, inner ring clearance 0.02-0.04mm.

Installation Requirements: Transition fit with bearing housing; clean the bearing housing and apply Cat coating before installation. Specialized grease, with the outer ring end face fitting snugly against the bearing housing locating surface, axially fixed by a snap ring or retaining ring. After installation, check the radial clearance to ensure it meets equipment specifications.

Functions and Application Scenarios

Core Function: As the outer ring support component of the bearing, it provides stable radial positioning. A special coating resists metal debris generated by gear wear, preventing debris from entering the bearing and causing raceway scratches and roller wear. Suitable for the harsh operating conditions of heavy-duty equipment gearboxes/torque converters, extending the overall bearing life (Cat® Parts).

Application Scenarios: Used for replacing the outer ring when the gearbox/torque converter exhibits abnormal noise, abnormal oil temperature rise, excessive bearing clearance, etc., and inspection reveals outer ring raceway wear, scratches, or corrosion. Suitable for maintenance needs of transmission system components during equipment overhauls/major repairs.

Performance Characteristics: High-carbon chromium bearing steel combined with a special surface coating provides high hardness, high wear resistance, and anti-debris capability, effectively isolating metal impurities and reducing raceway damage.

Precise dimensional and tolerance control ensures compatibility with the bearing housing and inner ring, reduces installation errors, and guarantees bearing operational accuracy.

Rounded edges prevent damage to seals during installation, improve assembly reliability, and enable long-term stable operation under harsh conditions.