Description
CAT 7J-1770 Draft Frame Bearing Cap
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The CAT 7J-1770 is a heavy-duty steel bearing cap designed by Caterpillar for its 621/627/633/651/657 series wheeled loaders and graders. It is used to secure bearing assemblies in components such as the drawbar and sidewalls, providing positioning, sealing, contamination prevention, and load-bearing support. It is suitable for swing/rotation mechanisms under heavy loads and features high strength, impact resistance, and deformation resistance. The following are the core information:
Core Parameters
Item Details
Basic Attributes
Model 7J-1770, Steel bearing cap, used to secure bearings, seal bearing cavities, and prevent dust/impurities. Suitable for drawbar pin bearings, sidewall swing shaft bearings, etc. Requires bolts and washers for use.
Compatible Models Cat Wheeled scrapers and graders including models 621/621B/621E/621F/621G, 623B/623E/623F/623G, 627/627B/627E/627F/627G, 633D, 639D, 651B/651E, 657B/657E/657G, etc.
Material and Manufacturing Process: Made of Q345B low-alloy high-strength steel, with galvanized passivation treatment for corrosion resistance; hardness HB 180-220, tensile strength ≥510MPa; operating temperature -40℃ to +120℃, suitable for outdoor and heavy-duty conditions.
Key Dimensions: Inner diameter 120.65mm (4.75in), outer diameter 180.00mm (7.09in), thickness 25.40mm (1.00in), number of mounting holes 4 One bolt, 19.05mm (0.75in) bore diameter, 152.40mm (6.00in) bolt hole center circle diameter, weighing approximately 2.8kg.
Functional parameters: Rated load capacity 10MPa, compatible with M16×2.0 bolts, tightening torque 85-95N・m; sealing type is a combination seal (nitrile rubber + metal skeleton), oil, water, and dust resistant, compatible with lithium-based grease (NLGI 2).
Matching components: Compatible with bearing assembly 513-9232, sleeve bearing 609-3781, matching gasket 123-4567, bolt 9Y-2991; installation requires a torque wrench and locating pin; Loctite 243 is recommended. Thread-locking Adhesive Application
Installation and Maintenance Points
Preparation Before Installation: Clean the bearing cap and mounting surface, removing burrs, oil, and rust; check the bearing cap for cracks, deformation, and plating peeling; measure the center distance and diameter of the mounting holes to ensure they meet requirements; prepare the matching bolts, washers, and locating pins.
Installation Steps: Apply a small amount of sealant (such as Loctite 518) to the sealing groove of the bearing cap; align the bearing cap with the mounting surface and insert the locating pin for positioning; install the bolts and pre-tighten them diagonally (torque 40-50 N·m); finally tighten them to the specified torque (85-95 N·m) using a torque wrench, ensuring even force distribution.
Maintenance and Replacement: Check the bolt torque every 1500 hours; retighten immediately if loose; check the seals every 3000 hours; replace immediately if leakage is found; replace the bearing cap immediately if cracks, deformation, or seal failure occur.
