Description
CAT 4T-1897 RACE-INNER
| CAT 4T-1897 RACE-INNER |
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| CAT 2G-1611 BUSHING |
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| CAT 156-6997 BEARING |
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The CAT 4T-1897 (4T1897) is a Caterpillar original equipment single-row tapered roller bearing inner race/inner ring, suitable for engine and transmission system bearing assemblies. The following is purely precise information (no additional description):
Core Parameters and Information
Item Details
Part Model: CAT 4T-1897 Inner Race
Part Type: Tapered roller bearing inner ring, forming a complete bearing with the outer ring, rollers, and cage, bearing radial and unidirectional axial loads, suitable for high-speed rotation
Material: High carbon chromium bearing steel (chromium content 1.5%), integrally quenched + low-temperature tempered, surface hardness HRC 60-64, core hardness HRC 30-45
Key Dimensions: Inner diameter 38.10 mm (1.5 in), outer diameter 52.39 mm (2.0625 in), width 16.51 mm (0.65 in), cone angle 12°, roller contact length 14.2 mm mm
Structural Features: Single-row tapered roller inner ring with large flanges, guiding roller positioning, forming a rolling channel with the outer ring tapered surface, suitable for split installation.
Compatible Structures: Engine crankshaft front/rear bearings, gearbox input shaft bearings, drive axle main reducer bearings, camshaft bearing assemblies.
Applicable Operating Conditions: Suitable for rotary transmission scenarios with temperatures ranging from -40℃ to 120℃, medium to high speeds (≤3600 rpm), and medium to heavy loads (radial load ≤55 kN).
Compatible Engines and Assemblies:
Engines: CAT 3306, 3406, 3406B/C/E, 3408/C/E, 3412/E series diesel engines (crankshaft bearings, camshaft bearing inner rings)
Construction Machinery: CAT D8L/D9N tracked bulldozers, 980B loaders, 777D mining dump trucks (gearbox/drive axle bearing inner rings)
Compatible Bearing Assemblies: CAT 4T-1897 + 4T-1898 Outer Ring + Roller Assembly, for 3406 engine crankshaft main bearings and gearbox second shaft tapered roller bearings.
Installation and Fitting Points:
Installation shaft diameter 38.08-38.10 mm. The inner ring and shaft should have an interference fit (interference 0.01-0.02 mm) to ensure no relative rotation.
Heat the inner ring with a bearing heater (80-100℃) before heat fitting, or cold press with a special press. Do not hammer directly to prevent deformation of the flanges and damage to the raceway.
Before installation, clean the journal and inner ring raceway, ensuring no burrs, oil, or rust. Inspect the raceway for pitting and cracks, and check the flanges for damage.
After installation, the inner ring end face runout should be ≤0.02 mm, the clearance with the outer ring should be 0.03-0.05 mm, and rotation should be smooth without jamming or abnormal noise.
Install the bearing end cap as a set with the corresponding outer ring, rollers, and cage. After installation, pre-tighten the bearing end cap to the specified torque to ensure axial positioning.
