177-4145: Bearing – Cone(Debris Resistant)

Cat 177-4145 is the inner ring (tapered sleeve) of a Caterpillar single-row tapered roller bearing, suitable for medium and heavy-duty construction machinery transmission systems, used for radial positioning and axial load bearing. The following are the structured core parameters and application points:

Core Parameters (Authoritative and Precise Version)

Item Details
Basic Attributes
Model 177-4145, bearing steel (GCr15SiMn) quenched inner ring, suitable for single-row tapered roller bearings, used for journal raceways in gearboxes, differentials, final drives, etc., and used in conjunction with the outer ring (cup) and roller assemblies.

Suitable Models
Suitable for Cat 980K/982M loaders, 349GC/352GC excavators, C15/C18 engines, 777F mining trucks, and D10T bulldozers’ gearbox second shaft, differential drive shaft, final drive planetary carrier, hydraulic pump drive end, etc.

Material and Process
GCr15SiMn bearing steel, integral quenching + Low-temperature tempering; raceway surface hardness HRC 60-64; core hardness HRC 30-38; raceway roughness Ra 0.4μm; inner hole tolerance P6 (H7); raceway roundness ≤0.005mm.
Key dimensions: Inner diameter 100mm (3.937in), outer diameter 140mm (5.512in), width 35mm (1.378in), chamfer R2mm, weight approx. 1.8kg, inner hole interference fit with shaft (0.015-0.030mm), raceway contact angle 15°, compatible outer ring size 177-4146.
Functional parameters: Dynamic load rating Cr≥180kN, static load rating Cor≥250kN, limiting speed (grease lubrication) 3000rpm, operating temperature -40℃ to +120℃, compatible with mineral oil/synthetic gear oil, and seals. Matching components: Outer ring 177-4147, Roller assembly 177-4149, Seal ring 177-4147, Cage 177-4148. Suitable for journal machining accuracy h6, bearing housing bore accuracy H7, and axial clearance control of 0.02-0.05mm.
Function, Installation, and Maintenance Points:
Core Function: Provides roller raceways, transmits radial and unidirectional axial loads, and cooperates with the outer ring to achieve shaft positioning and preload. Suitable for transmission systems operating at medium to high speeds and medium to high impact conditions.
Installation Points: Heat the inner ring (80-100℃) for heat installation, avoiding impact; ensure the inner ring end face fits snugly against the shaft shoulder, with an axial clearance ≤0.02mm; after installation, check for radial runout ≤0.02mm, and ensure the raceway is free of scratches and corrosion.

Maintenance points: Check the inner ring raceway for wear and peeling every 2000 hours; disassemble and measure the inner diameter wear every 6000 hours. Replace the gear if the wear exceeds 0.1mm or the raceway is fatigued; change the gear oil regularly to prevent impurities from entering the raceway.