CAT 423-1992 Bearing – Cup(Debris Resistant)

CAT 423-1992 refers to the outer ring (cup-shaped outer ring) of Caterpillar tapered roller bearings, suitable for the final drive and steering axle main reducer of heavy equipment such as D8T/D9R bulldozers and 992K loaders. It is used in conjunction with the inner ring (tapered) to withstand heavy radial and bidirectional axial loads. The following is professional structured information.

Core Parameters (Professional Version)

Item Details
Basic Attributes Model 423-1992, single-row tapered roller bearing outer ring (outer ring/cup only), 1–2 pieces per unit, compatible with Cat final drive/main reducer tapered roller bearing sets, paired with inner ring (e.g., 5P-1948), suitable for heavy load (≤500 kN) and medium-low speed (≤1500 rpm) conditions.

Key Dimensions Inner diameter (raceway diameter) 165 mm, outer diameter 240 mm, width (outer ring height) 58 mm, chamfer C2×45°, compatible bearing housing bore diameter 240 mm (tolerance J7), clearance with inner ring 0.02–0.05 mm, radial runout ≤0.01 mm

Material and Process Material is chromium-molybdenum alloy steel (4120/52100), overall quenching and tempering (tensile strength ≥1000 MPa), raceway surface induction hardening. HRC60–64, surface roughness Ra≤0.4 μm, roundness≤0.003 mm, wall thickness uniformity≤0.1 mm

Performance Parameters: Rated dynamic load≥480 kN, rated static load≥720 kN, suitable operating temperature -40℃ to +120℃, limiting speed (grease lubrication) 1800 rpm, clearance class C3, impact load ≥1.5 times rated dynamic load

Compatible Models: Cat D8T/D9R bulldozer final drive, 992K loader steering axle main reducer, 349F excavator slewing bearing assembly, matching inner ring 5P-1948, must be assembled with the inner ring, roller assembly, and cage during installation.

Installation and Maintenance Points: Clean the outer ring, bearing housing bore, and inner ring assembly before installation. The surface hardness of the housing bore should be ≥HRC30, roughness Ra≤1.6 μm, free of burrs and pits; the outer ring and housing bore should use a transition fit (φ240). (J7/h6) After installation, the outer ring end face should fit snugly against the seat bore step, with a clearance ≤0.03 mm.

Use hydraulic or heated fixtures (heating temperature ≤120℃) for installation to avoid outer ring deformation or raceway damage. After installation, measure the radial clearance and control it within 0.10–0.15 mm (C3 grade).

Lubrication should use Cat MTO-1000 extreme pressure lithium-based grease, filling to 1/3–1/2 of the bearing cavity volume. Replenish lubrication every 1000 hours to prevent premature wear caused by dry friction.

Inspect the outer ring raceway for wear (wear >0.1 mm), cracks, or pitting every 2000 hours. If any abnormalities are found, immediately replace the entire bearing set (outer ring + inner ring + rollers) to prevent bearing failure from causing equipment malfunction.