CAT 538-3178 BEARING-SEM

CAT 538-3178 (5383178) is a Caterpillar genuine SEM cylindrical roller bearing used for radial support in heavy-duty transmission components such as gearboxes and drive axles. The following is purely accurate information (without additional description):

Core Parameters and Information

Item Details
Part Model: CAT 538-3178 SEM Cylindrical Roller Bearing

Part Type: Single-row cylindrical roller bearing (with cage), used to withstand heavy radial loads, suitable for high-speed rotational conditions, suitable for radial support of shafts in transmission components such as gearboxes and drive axles, limiting radial displacement and ensuring transmission accuracy and stability

Material: Inner ring / Outer ring / Roller: High carbon chromium bearing steel (GCr15), quenching hardness HRC60-64; Cage: High-quality low carbon steel, galvanized surface treatment, suitable for operating conditions from -40℃ to 120℃

Key Dimensions: Inner diameter 65.00 mm (2.5591 in), outer diameter 120.00 mm (4.7244 in) 23.00 mm (0.9055 in) width, 8.00 mm (0.3150 in) roller diameter, 18 rollers, cage pitch circle diameter 92.50 mm (3.6417 in).

Structural Features: Single-row full-roller bearing with cage, no outer ring flange, double inner ring flange, allowing a small amount of axial displacement between the shaft and the bearing inner ring, adapting to the thermal expansion and contraction requirements of the shaft system. The cage is stamped, and the rollers are evenly distributed, reducing friction and wear and improving rotational accuracy.

Suitable Structures: Loader gearbox second shaft bearing, excavator swing drive axle output shaft bearing, grader drive axle differential bearing, road roller vibratory shaft bearing.

Applicable Working Conditions: Suitable for radial load ≤45 kN, speed ≤6000 rpm, no strong impact conditions, used for radial support of heavy-duty transmission components to ensure stable shaft operation.

Compatible Models and Assemblies:
Loader: CAT 950GC, 966M (Transmission two-shaft bearing assembly, drive axle differential bearing assembly)
Excavator: CAT 320GC, 330GC (Swing drive axle output shaft bearing assembly, travel motor reduction gearbox bearing assembly)
Gradeer: CAT 140M, 160M (Drive axle differential bearing assembly, steering drive shaft bearing assembly)
Road Roller: CAT CS74B, CS78B (Vibration shaft bearing assembly, travel drive axle bearing assembly)
Compatible Assemblies: 950GC transmission two-shaft bearing assembly, 320GC swing drive axle output shaft bearing assembly, 140M drive axle differential bearing assembly
Installation and Fitting Points: Inner ring interference fit with shaft (interference 0.015-0.025 mm), outer ring transition fit with bearing housing (clearance 0-0.010 mm), using hot fitting method (oil temperature) Install the inner ring at 80-100℃. Do not strike the bearing to prevent damage to the rollers and raceways.

Before installation, clean the journal, bearing housing bore, and bearing itself, ensuring they are free of burrs, oil, and rust. Inspect the bearing for cracks and deformation, and ensure the rollers rotate freely without jamming or abnormal noise.

After installation, the bearing end face should fit snugly against the locating component. Radial runout ≤0.02 mm, axial runout ≤0.10 mm, and operation should be free of abnormal vibration and noise. Ensure adequate lubrication and no overheating.

When disassembling, use a dedicated puller to evenly pull out the inner ring. Do not pry forcefully to avoid damaging the shaft and bearing. Before reusing, check the wear of the raceways and rollers; replace if necessary.