CAT 6F-7523 Two Bolt Bearing Cap

CAT 6F-7523 is a Caterpillar trunnion bearing cap used to support and position the front axle/steering knuckle trunnions of wheel loaders/graders. It is compatible with Cat 825G/825H/826C/836 and other equipment. Its core functions are to secure the tapered roller bearing, seal the grease, and withstand radial loads. The following is professional structured information.

Core Parameters (Professional Version)

Project Details
Basic Attributes Model 6F-7523, Trunnion Bearing Cap (including sealing groove/bolt holes/locating stop), compatible bearing inner diameter 76.2 mm (3.000 in), unit weight 2.45 kg, quantity per unit 1 piece (front axle right trunnion end), compatible bolt M12×1.75 (8.8 grade, torque 85–95 N・m)

Key Dimensions Inner diameter φ139.7 mm (tolerance J7: +0.01–-0.01 mm), stop diameter φ152.4 mm (tolerance 0–-0.03 mm), thickness 32 mm (tolerance ±0.1 mm), bolt hole distribution circle φ170 mm (6 holes, hole diameter φ13 mm, countersunk head φ20 mm×90°), sealing groove width 8 mm × depth 3 mm (compatible O-ring) φ145×3.5 mm

Material and Manufacturing Process: Alloy cast steel (ZG310-570, normalized HB 180–220), surface painted (corrosion resistance ≥48 hours salt spray), precision boring of inner bore (roundness ≤0.01 mm, cylindricity ≤0.015 mm), bolt hole tapping accuracy 6H

Performance Parameters: Rated load capacity radial load 120 kN (linear velocity ≤1.2 m/s), operating temperature -40℃ to +120℃, sealing pressure ≤0.3 MPa, compatible bearing model 342-4640/1B-6577

Compatible Machine Models: Loader 825G/825G II/825H, Grader 826C/836, compatible front axle trunnion φ76.2 mm (tolerance h6: 0–-0.019) (mm)

Installation and Maintenance Points: Before installation, clean the inner bore of the bearing cap, the stop, and the trunnion surface. Inspect the O-ring (material NBR 70, undamaged). Apply lithium-based grease (NLGI grade 2) to the sealing groove. After positioning with the guide sleeve, tighten the bolts evenly (in a crisscross sequence, tightening in 2–3 stages to the target torque).

Clearance Control: The clearance between the bearing cap and the bearing outer ring end face should be 0.05–0.10 mm (controlled by adjusting shims to 0.05 mm/0.1 mm specifications) to prevent excessive bearing preload leading to temperature rise.

Lubrication Requirements: After installation, add extreme pressure lithium-based grease until overflowing (grease amount ≥150 g). Check the grease level every 500 hours and replenish grease every 1000 hours to avoid dry friction causing bearing pitting.

Troubleshooting: If oil leakage or abnormal noise occurs, first check for O-ring aging (replacement cycle 2000 hours), bearing cap deformation (flatness > 0.1 mm requires correction) or loose bolts. If necessary, replace the bearing cap and correct the radial runout of the shaft system to ≤ 0.05 mm.