CAT 257-8656 51.925mm Diameter Thrust Bearing

CAT 257-8656 is a Caterpillar genuine thrust roller bearing, suitable for the gearbox, drive axle, or hydraulic pump of small track loaders and skid steer loaders. It is used to bear axial loads and position rotating parts, preventing axial movement and ensuring stable operation of the transmission and hydraulic systems. The following is key information.

Core Technical Parameters

Item Details
Part Model: CAT 257-8656 (Thrust Roller Bearing, Single Unit)

Material: Inner/Outer Ring: GCr15 Chromium Bearing Steel (HRC 60-64); Rolling Elements: High Carbon Chromium Bearing Steel; Cage: Stamped Steel Plate; No Seal (Suitable for Sealed Cavities or Pre-Lubricated Conditions)

Key Dimensions: Inner Diameter approx. 50mm, Outer Diameter approx. 80mm, Thickness approx. 15mm, Roller Diameter approx. 8mm, Quantity: 12, Axial Clearance 0.008-0.015mm

Single Weight: Approx. 0.28kg (0.62 lbs)

Compatible Models: CAT 257, 259D and other tracked loaders, 247B, 277C and other skid steer loaders (gearbox output end, drive axle differential, hydraulic pump axial support)

Performance Characteristics Rated axial dynamic load ≥42kN, rated axial static load ≥68kN, suitable for temperatures from -30℃ to +110℃, vibration-resistant and impact-resistant, suitable for medium- and low-speed heavy-duty axial applications.

Structure and Core Functions

Axial Positioning: Limits the axial displacement of rotating components (such as gears and shafts), preventing collisions and wear caused by axial movement during transmission, ensuring transmission accuracy.

Axial Load Bearing: Transmits axial force through thrust rollers, evenly distributing the load, avoiding localized stress concentration, protecting the shaft and housing end faces, and extending component life.

Rotation Guiding: The cage guides the rollers to roll in an orderly manner, reducing friction and vibration, improving rotational efficiency, suitable for medium- and low-speed applications such as gearboxes and drive axles.

Clearance Compensation: Adapts to installation clearances, compensates for thermal expansion and contraction of components, ensures stable axial positioning, and avoids operational abnormalities caused by excessive clearances.

Compatible Models and Application Scenarios

Compatible Equipment: CAT 257, 259D tracked loaders, 247B, 277C, 287C skid steer loaders, etc.

Installation Location: Transmission output shaft end face, drive axle differential housing, hydraulic pump/motor axial support position, used to bear axial loads and provide positioning.

Core Purpose: Provides axial positioning and load support for rotating components in the transmission and hydraulic systems, preventing axial movement, suitable for frequent start-stop and heavy-load axial conditions, ensuring stable equipment operation.