CAT 7Y-0818 BEARING AS

CAT 7Y-0818 is a Caterpillar genuine double-row tapered roller bearing assembly, suitable for the final drive planetary carrier of tracked bulldozers such as the D8K. It is used to withstand radial and bidirectional axial loads, ensuring stable operation of the drivetrain. The following is pure raw data and does not include replacement parts information for Cat®…

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 7Y-0818, Type: Double-row tapered roller bearing assembly (including inner and outer rings, rollers, and cage), suitable for tracked bulldozer final drive planetary carrier, single weight 4.2 kg, operating temperature -40℃ to +120℃, suitable for gear oil medium, used to support planetary gear shaft, withstand combined loads, and suppress transmission shock and vibration

Key Dimensions (Metric / Imperial)
Inner diameter 100.0 mm (3.937 in, tolerance ±0.015 mm), outer diameter 180.0 mm (7.087 in, tolerance ±0.02 mm), width 55.0 mm (2.165 in, tolerance ±0.1 mm), roller diameter 16.0 mm, cage pitch circle diameter 140.0 mm, inner and outer ring clearance 0.05-0.10 mm

Performance Parameters
Material: Chromium-molybdenum alloy steel (inner and outer rings hardened, hardness…) HRC 60-64; rollers carburized, hardness HRC 62-66), radial rated dynamic load ≥180 kN, axial rated dynamic load ≥250 kN, rated static load ≥280 kN, limiting speed ≤3000 rpm, wear life ≥15000 hours, impact strength ≥100 J/cm². Structure and Adaptability:

Double-row tapered roller structure: Utilizes a symmetrical double-row roller design, capable of simultaneously bearing radial and bidirectional axial loads, adapting to the complex stress conditions of the final drive planetary carrier, reducing transmission system vibration and noise, and improving operational stability (Cat®…).

Integral cage: Employs a stamped steel plate cage, possessing high strength and excellent guiding performance, preventing roller tilting and jamming, ensuring efficient lubrication and heat dissipation of the bearing assembly, suitable for heavy-duty, low-speed final drive operating environments (Cat®…).

Machine Compatibility: Compatible with the final drive planetary carrier of tracked bulldozers such as D8K and D8L. It supports the planetary gear shaft, ensuring efficient power transmission and preventing planetary gear wear and transmission jamming caused by bearing failure.

Installation and Maintenance Points (Original Data)

Installation: Clean the mounting base and journal (free from oil, rust, and burrs). Use the heat-fit method (heat the bearing to 80-100℃). Direct hammering is prohibited. After installation, the bearing end face should be flush with the mounting base, with a coaxiality tolerance ≤0.03 mm. Preload should be controlled at 50-80 N·m to ensure smooth and unobstructed operation (Cat®…).

Maintenance: Check the lubrication of the bearing assembly every 1000 hours and change the gear oil regularly (Cat DEO-ULS 15W-40 recommended). Keep the oil level at the center line of the oil level gauge. Replace the bearing immediately when the operating noise is >85 dB, the temperature is >80℃, or the clearance is >0.2 mm to avoid damage to the final drive gears.