CAT 574-3204 Roller Bearing

CAT 574-3204 is a Caterpillar genuine single-row tapered roller bearing (including inner ring/outer ring/rollers/cage assembly), suitable for the gearbox output shaft, drive axle differential housing, or boom hinge shaft end of Cat 988H loaders, D11T bulldozers, and other models. It is used to simultaneously bear radial and bidirectional axial loads under heavy-duty conditions, ensuring the rotational accuracy and stability of transmission/support components. The following is a professional technical and application guide:

Core Technical Parameters (Professional Version)

Item Details Basic Attributes Model 574-3204, Type Single-row tapered roller bearing (including outer ring/inner ring/rollers/stamped steel cage, no seal), Suitable for Cat 988H loader gearbox output shaft, D11T bulldozer drive axle differential housing, 966H loader boom upper hinge shaft end, D9R track frame balance shaft bearing housing, Material is inner ring/outer ring (SAE) 52100 bearing steel, quenched hardness HRC 60-64; rollers (SAE 52100, HRC 62-66, logarithmic generatrix modified); cage (SAE 1010 steel plate stamping, galvanized surface); inner diameter φ160 mm (tolerance JS6); outer diameter φ240 mm (tolerance P6); width 58 mm; unit weight approximately 12.8 kg; rated radial load Cr≥480 kN; rated axial load Ca≥220 kN; rated static load Cor≥750 kN; operating temperature -40℃ to +120℃; lubrication method: forced oil lubrication (ISO VG 46 anti-wear hydraulic oil) / grease lubrication (NLGI 2 lithium-based grease); limiting speed (grease lubrication) ≤1200 rpm, (oil lubrication) ≤1800 rpm. Key dimension: inner ring large end face diameter φ190 mm (tolerance…). H7), outer ring small end face diameter φ210 mm (tolerance H7), number of rollers 24 (φ18 mm × 32 mm), cage window clearance 0.5-0.8 mm, inner ring raceway cone angle 12°30′ (tolerance ±15′), outer ring raceway cone angle 12°30′ (tolerance ±15′), radial clearance 0.12-0.18 mm (before installation), preload after installation 50-80 N・m
Material and Process: Bearing steel vacuum quenched + low temperature tempered; roller logarithmic generatrix modified to reduce edge stress concentration; cage uses riveted structure; roller-raceway contact fatigue life ≥5000 hours (under rated load); surface roughness Ra≤0.4 μm (inner ring raceway) /≤0.6 μm (outer ring raceway); no surface defects (magnetic particle inspection qualified).
Compatible Models: Cat 966H/972H/980H Drive axles for loaders, D11T/D9R bulldozers, 988H loaders, and 777D mining trucks. Core components include the gearbox output shaft, drive axle differential, and heavy-duty support for the boom/track frame. Suitable for impact conditions with radial loads ≥400 kN and axial loads ≥180 kN.

Assembly Fit: Interference fit with shaft (interference 0.02-0.04 mm, hot fit temperature 80-100℃); clearance fit with bearing housing (clearance 0.03-0.05 mm). After installation, pre-tighten with nuts and prevent loosening. After pre-tightening, axial runout ≤0.05 mm, radial runout ≤0.08 mm.

Installation and Maintenance: Before installation, clean the bearing inner and outer rings, journals, and bearing housing bores. Check for cracks, missing rollers, and cage deformation. Measure the inner/outer diameter/width and raceway runout to ensure they meet tolerances. Clean with solvent, dry, and apply a thin layer of oil for rust prevention.

During assembly, heat the inner ring to 80-100℃ (induction heating/oil bath, avoid localized overheating), quickly install it onto the journal and position it, press the outer ring into the bearing housing bore, apply a preload of 50-80 N·m according to the model manual, install the lock nut and lock it.

Maintenance Recommendations: Check lubrication pressure and oil quality every 800 hours (oil lubrication) / replenish grease every 1000 hours (grease lubrication). Replace immediately if pitting occurs on the raceway, roller surface peeling, or radial clearance > 0.3 mm to prevent decreased transmission accuracy or bearing seizure.