CAT 208-9009 BEARING

CAT 208-9009 is a Caterpillar genuine single-row cylindrical roller bearing, suitable for gearbox/transfer case gear shafts. The following is precise information (no additional description):

Core Parameters and Information

Item Details
Part Model: CAT 208-9009 (2089009) Single-row Cylindrical Roller Bearing

Part Type: Single-row cylindrical roller bearing, separable inner/outer ring, withstands pure radial loads, suitable for medium-speed, medium-heavy-load, and stable operating conditions

Material: SAE 52100 high-carbon chromium bearing steel, hardened to HRC60-64, raceway surface roughness Ra≤0.08μm, roller diameter 8.5mm

Key Dimensions: Inner diameter 45.00mm, outer diameter 85.00mm, total width 20.00mm, number of rollers 12, chamfered ends 1.0×45°

Structural Features: Separable inner ring/ Outer ring: solid brass cage; inner ring: unflanged; fits 45.00mm diameter journal; shaft fit interference fit: 0.015-0.030mm.
Compatible Structure: Journal fit tolerance k6; rated radial load 85kN; rated static load 78kN; operating temperature -40℃ to +120℃.
Lubrication Requirements: Oil lubrication (CAT DEO-ULS 15W-40 recommended) or grease lubrication (CAT 4V-9668); grease filler should be 1/3 of the bearing cavity.
Compatible Machines and Assemblies:
Excavators: CAT 320GC, 323GC (transmission shaft 2)
Loaders: CAT 938M, 950M (transfer case output shaft)
Compatible Assemblies: Transmission/transfer case gear shaft support bearing assembly
Matching Parts: 208-9009 bearing, 8T-4125 elastic retaining ring, 320-8563 Bushing (for positioning)
Installation and Fitting Points
**Before installation, clean the journal, inner ring, outer ring, and roller assembly to remove iron filings and oil.** Cold press installation is required; pressure ≤20kN. Do not strike the inner or outer ring end faces to avoid deformation.

Journal fit tolerance: k6. Interference between the inner ring and shaft: 0.015-0.030mm. After installation, the inner ring end face should fit snugly against the shaft shoulder without gap, and rotation should be smooth.

During installation, the cage opening should face the non-positioning end. The clearance between the outer ring and bearing housing should be 0.005-0.015mm to ensure space for thermal expansion and contraction.

Use a dedicated puller for disassembly to avoid damaging the journal/bearing housing. When replacing, check the journal wear to be ≤0.05mm; if it exceeds this tolerance, replace the shaft simultaneously.