517-0279: Drawbar Bearing Cap

CAT 517-0279 is a Caterpillar drawbar bearing cap assembly, suitable for the hinge joint of heavy equipment drawbars, used to secure and seal bearings. Key information is as follows:

Key Parameters
Item Details
Type: Double-bolted bearing cap, integrated gasket and locating pin, compatible with single/double row tapered roller bearings, axial positioning + radial support, preventing bearing movement and contaminant ingress.

Dimensions (Metric/Imperial): Inner diameter 101.60mm (4,000 inches), outer diameter 152.40mm (6,000 inches), thickness 25.40mm (1,000 inches), bolt hole diameter 19.05mm, hole spacing 127.00mm, compatible with corresponding bearing outer diameter and mounting hole position.

Material: Low carbon alloy steel (AISI 1045), integrally forged and tempered, hardness… HB220-250, tensile strength ≥650MPa, uncoated surface, corrosion resistance relies on overall equipment protection.

Accuracy: Inner diameter tolerance +0.020/-0.010mm, outer diameter tolerance ±0.15mm, bolt hole position tolerance ±0.10mm, ensuring precise fit with bearings and brackets to prevent swaying after installation.

Sealing Structure: Built-in nitrile rubber (NBR) gasket, 3.0mm thick, compression 0.5-1.0mm, suitable for operating temperatures -40℃ to 120℃, preventing dust and moisture from entering the bearing cavity.

Suitable Applications: Compatible with drawbar hinge shaft bearings in Cat D9R/D9T bulldozers, 988K loaders, etc., used to fix 1J-6744 and other double-row tapered roller bearings to ensure smooth operation of the drawbar under heavy load and vibration conditions.

Suitable for use during equipment overhauls when bearing caps are deformed, cracked, or gaskets are aged and leaking, facilitating assembly replacement and ensuring the reliability of hinged joints.

Performance Characteristics: The integral forged structure provides high rigidity, withstanding impact loads from traction operations, preventing deformation that could lead to abnormal bearing clearances, and extending bearing life.

Integrated gaskets and locating pins eliminate the need for additional fittings during installation, ensuring high positioning accuracy, reducing installation errors, and improving maintenance efficiency.

The alloy steel material is fatigue-resistant, suitable for heavy-load, high-frequency vibration conditions, and reduces the risk of cracking.