CAT 222-4617 BEARING CAP

CAT 222-4617 is a Caterpillar genuine double-row self-aligning roller bearing (suitable for heavy-duty drive axles/transmissions, capable of withstanding bidirectional axial and large radial loads). It is used in heavy-duty equipment such as the Cat 793D mining truck drive axle, D11T bulldozer transmission, and 992K loader differential, and can compensate for installation misalignment between the shaft and housing. The following is a professional technical and application guide:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes
Model 222-4617, Type: Double-row self-aligning roller bearing (double-row spherical rollers + symmetrical spherical raceways + integral stamped steel cage, with integrated spacer ring), Suitable for Cat 793D mining truck drive axle main reducer, D11T bulldozer transmission output shaft, 992K loader differential half-shaft, 785D mining truck balance shaft bearing housing, Material: Inner ring/Outer ring/Roller (SAE 52100) Bearing steel, quenched hardness HRC 62-66, cage (SAE 1010 steel sheet stamping, galvanized and passivated surface), spacer ring (SPCC cold-rolled steel sheet, 3 mm thick), inner diameter 100 mm (tolerance JS6, +0.025/-0.025 mm), outer diameter 215 mm (tolerance h7, 0/-0.052 mm), width 47 mm (tolerance ±0.25 mm), single weight approximately 3.8 kg, rated radial load Cr≥380 kN, rated static load Cor≥450 kN, contact angle 0° (mainly bears radial load, bidirectional axial load ≤30% radial load), operating temperature -40℃ to +120℃, lubrication method is grease lubrication (NLGI 2 lithium-based grease, filling 30%-40% of bearing space) / oil lubrication (ISO VG 68) Anti-wear gear oil), limiting speed (grease lubrication) ≤2000 rpm, (oil lubrication) ≤2600 rpm, radial clearance C3 group (0.10-0.18 mm), interference fit with shaft (interference 0.018-0.035 mm), clearance fit with housing bore (clearance 0.030-0.060 mm)

Key dimensions: Roller diameter 18 mm (tolerance ±0.02 mm), number of rollers 32 (16 in each double row), cage window clearance 0.5-0.7 mm, inner ring flange height 12 mm (tolerance ±0.15 mm), outer ring raceway radius of curvature 52 mm (tolerance ±0.2 mm), logarithmic curve of roller crown (to reduce edge stress concentration), mounting reference end face runout ≤0.05 mm, axial positioning by shaft shoulder + lock nut (torque 300-350 N・m)

Material and process: Inner ring / The outer ring undergoes vacuum quenching and low-temperature tempering, with ultra-precision grinding of the raceway (Ra≤0.2 μm). It features roller crown design (uniform contact stress), an integrated stamped and riveted cage structure, and a central spacer ring to ensure balanced force distribution on the double-row rollers. It boasts a contact fatigue life ≥10,000 hours (under rated load), impact load resistance ≥80 kN, and repeatability ≤0.15 mm. Compatible models include Cat 793D/785D mining truck drive axle main reducer, D11T/D10T bulldozer gearbox output shaft, 992K/988H loader differential half-shaft, and 789D mining truck balance shaft bearing housing. Suitable operating conditions include radial load ≥300 kN and speed ≤1800 rpm. It can compensate for angular deviation (≤2°) and coaxiality deviation (≤0.2 mm) between the shaft and housing. Assembly fit: Interference fit with the shaft (interference 0.018-0.035 mm, hot fit temperature). (90-110℃), clearance fit with housing bore (clearance 0.030-0.060 mm), axial preload 6-10 kN after installation (to eliminate backlash and improve rigidity), radial runout ≤0.08 mm, axial runout ≤0.12 mm. Installation and Maintenance Points: Before installation, clean the bearing, journal, and housing bore. Check for rust on the bearing/deformation of the cage. Journal surface hardness HRC 58-62, roughness Ra≤0.4 μm, housing bore roundness ≤0.05 mm, and journal roundness ≤0.02 mm.

During assembly, use the hot fitting method (90-110℃) to assemble the shaft. Use a special tooling to guide the roller into the hole, ensuring uniform contact between the roller and raceway. After installation, pre-tighten with a lock nut (torque 300-350 N・m). After hot fitting, allow it to cool naturally to room temperature before loading to avoid damage to the raceway during cold fitting.

Maintenance recommendations: Check lubrication and wear every 1500 hours. If roller pitting/scratching, raceway wear > 0.15 mm, or clearance > 0.30 mm, immediately replace the bearing and repair the journal (polish the surface to Ra ≤ 0.4 μm) to prevent transmission failure.