CAT 112-9157 20.48mm Inner Diameter Flange Sleeve Bearing

CAT 112-9157 (1129157) is a Caterpillar straight-tube heavy-duty steel bushing used in articulated/swinging parts, suitable for loaders, bulldozers, and other equipment. The following is purely accurate information (without additional description):

Core Parameters and Information

Item Details
Part Model: CAT 112-9157 Bushing

Part Type: Straight-tube steel bushing for radial support and wear protection in articulated/swinging parts

Material: Low-alloy structural steel, integrally tempered (HRC 28–32), galvanized and passivated for corrosion protection

Key Dimensions: Inner diameter approx. 45.00 mm (1.772 in), outer diameter approx. 55.00 mm (2.165 in), length approx. 60.00 mm (2.362 in), with 45° chamfered ends

Structural Features: Thick-walled cylindrical shape, without lubrication grooves / Oil holes are used for wear-resistant isolation and positioning between the pin and the mounting base, limiting radial displacement of components.

Compatible Structures: Matching pins (e.g., 112-9158) and retaining rings, used in hinged/swinging parts such as the boom, stick, connecting rod, and balance beam.
Applicable Working Conditions: Heavy load, frequent swinging, suitable for dusty and humid outdoor working environments.
Compatible Machine Models:
CAT 950G/950H Wheel Loaders (boom/stick hinges, connecting rod support parts)
CAT D5N/D5R Bulldozers (balance beam, suspension system hinge points)
CAT 325C/325D Excavators (boom/stick hinges, connecting rod hinge parts)
CAT 140H Graders (steering knuckles, blade connection parts)
Installation and Fitting Points: Clearance fit with the pin, radial clearance 0.020–0.035 mm, ensuring flexible swinging/rotation without jamming.

The bushing should have a transition fit with the mounting hole (interference 0–0.018 mm). Use a dedicated press-fit tool for cold pressing assembly; do not strike the bushing body.

Before installation, clean the pin surface and mounting hole to remove burrs, rust, and impurities. Pre-install the seals and retaining rings to ensure reliable axial positioning.

Axial positioning is achieved using the retaining ring/step to prevent movement. After installation, check for smooth movement, no abnormal noise, no axial movement, and unobstructed lubrication channels.

Add the specified grease according to the machine manual. After initial lubrication, replenish the grease every 500 working hours.