CAT 108-8047 BEARING

CAT 108-8047 is a single-row cylindrical roller bearing specifically designed for planetary gearbox mechanisms in Caterpillar transmissions. It is compatible with planetary carriers and ring gears. The following data is raw and does not include replacement parts information for Cat®…

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 108-8047, Type: Single-row cylindrical roller bearing (with cage), Material: Chromium-molybdenum alloy steel (GCr15, hardened), Weight: 1.2 kg (2.65 lbs), Operating Temperature: -40℃ to +150℃, Surface Carburized and Hardened, Hardness: HRC 60-64, Rated Life: ≥15000 hours (standard operating conditions), Lubrication Method: Splash lubrication + Pressure oil assisted lubrication

Key Dimensions (Metric/Imperial)
Inner Diameter: 88.90 mm (3.500 in), Outer Diameter: 120.65 mm (4.750 in), Width: 25.40 mm (1.000 in), Roller Diameter: 7.94 mm, Number of Rollers: 20, Cage Material: Nylon PA66+GF30, Chamfers: 2×45° at both ends, Coaxiality: ≤0.015 mm, Inner Diameter Tolerance H7, outer diameter tolerance g6, surface roughness Ra≤0.4 μm
Matching and Performance Parameters: Suitable shaft diameter 88.90 mm (f7 tolerance), suitable mounting hole 120.65 mm (H7 tolerance), radial clearance 0.03-0.06 mm, basic rated dynamic load ≥145 kN, basic rated static load ≥180 kN, maximum permissible speed ≤3200 rpm, impact load ≥200 kN (instantaneous)

Structure and Fitting Characteristics: Cage-type cylindrical roller structure: Nylon-reinforced cage with spaced rollers to prevent friction and wear, suitable for high-frequency gearbox changes and impact conditions, ensuring smooth transmission of planetary mechanisms.

Carburizing and quenching treatment: Carburizing depth of inner and outer ring surfaces 0.8-1.2 mm, good core toughness, wear-resistant surface, suitable for heavy-duty and alternating load conditions, preventing poor meshing caused by gear ring misalignment.

Precise Clearance Control: Radial clearance is precisely matched to the thermal expansion characteristics of the gearbox, reducing contact stress between rollers and raceways and extending bearing life.

Compatible Models and Applications:

Excavators: Planetary gearboxes for hydraulic excavators such as the 336D2 and 349D2.

Loaders: Planetary carrier positioning for wheel loader gearboxes such as the 950M and 966M.

Others: Compatible with Cat 3500 series engine gearboxes and tracked bulldozer gearbox planetary assemblies, providing radial load and positioning functions (Cat®…).

Installation and Maintenance Points (Raw Data):

Installation: Clean the bearings, shaft diameter, and mounting holes, ensuring no metal shavings or oil contamination. Press-fit in a cold state. Apply even pressure to the inner ring end face using specialized tooling, with a pressing force of 8-10 kN, ensuring coaxiality ≤0.015 mm.

After installation, check the radial clearance, controlling it to 0.03-0.06 mm, ensuring unobstructed lubrication channels without jamming.

Maintenance: Check bearing condition every 2500 hours. Replace immediately if there is no pitting on the roller surface, no damage to the cage, and the clearance exceeds 0.12 mm.

Change transmission fluid (API GL-5) every 2000 hours, keeping the fluid level at the middle mark on the dipstick.