CAT 116-8039 168mm Inner Diameter Push Arm Bearing

CAT 116-8039 is a single-row radial roller bearing specifically designed for Caterpillar bulldozer booms. It is compatible with the boom pivot of heavy-duty bulldozers such as the D8T/D8R/D9T. Its core function is to bear the boom’s swing load and provide low-friction rotational support, ensuring smooth and reliable boom movement during operation. The following is professional structured information.

Core Parameters (Professional Version)

Project Details
Basic Attributes
Model 116-8039, Quantity per unit: 2 pieces (symmetrically arranged on both sides of the push arm), Fitting pivot diameter: 168 mm, Matching bearing cover 116-8038, Locating pin 123-4011, Single bearing weight: 18.5 kg, including bearing body, seal ring, dust cover, and mounting positioning ring

Key Dimensions
Inner diameter: 168 mm (tolerance H7: 0–+0.040 mm), Outer diameter: 240 mm (tolerance g6: 0–-0.033 mm), Width: 55 mm (tolerance ±0.1 mm), Mounting groove diameter: 210 mm (tolerance H8: 0–+0.054 mm), Locating ring thickness: 8 mm (tolerance ±0.05 mm), Bearing end face flatness: ≤0.02 mm

Material and Process
Material is chromium-molybdenum alloy steel (outer ring 42CrMo, inner ring 50Mn, rollers…) GCr15 stainless steel, outer ring surface hardened (hardness HRC58–62, hardened layer depth 2.5–3.0 mm), roller precision grade P5, inner ring raceway roughness Ra≤0.2 μm, seals made of nitrile rubber (oil-resistant and temperature-resistant), dust cover made of stamped steel plate.

Performance Parameters: Rated dynamic load 1250 kN, rated static load 2800 kN, limiting speed 80 rpm (grease lubrication), operating temperature -40℃ to +120℃, radial clearance 0.12–0.18 mm, sealing protection grade IP65, fatigue life ≥10⁵ cycles.

Compatible Models: Cat D8T/D8R/D9T/D9R bulldozers, with matching pusharm 168-0921, pivot 168-0922, and bearing cap. 116-8038, suitable for heavy-duty operations in mining, infrastructure, and other similar applications.
Installation and Maintenance Points: Before installation, clean the inner and outer rings of the bearing and the mounting holes of the push arm. Apply Cat-specific lithium-based grease to the bearing. Insert the locating ring into the mounting groove. Use hydraulic tooling to press-fit the bearing (press-fitting force ≤ 50 kN). Tighten the bearing cap bolts (M24×3) diagonally to a torque of 380 N·m. Ensure the dust cover and sealing ring are flush.

Maintenance Cycle: Check the bearing clearance every 1500 hours (replace if radial clearance > 0.3 mm). Clean and replenish grease. Check for seal damage; replace the sealing ring immediately if leakage is found.

Troubleshooting: If the push arm swings with abnormal noise/increased resistance, prioritize checking for bearing roller wear, seal failure, and loose mounting bolts. Replace the bearing assembly and pivot if necessary.