CAT 3Q-0543 CAP-BALL J

CAT 3Q-0543 is a Caterpillar genuine ball joint cap used for dustproof sealing and lubrication protection of ball joints in steering/suspension/connecting rods. It is compatible with ball joint assemblies of steering tie rods, suspension ball joints, or working device connecting rods in engineering machinery. The following is precise original part information:

Core Parameters and Compatibility Information

Item Details
Part Model: CAT 3Q-0543 (3Q0543) Genuine Ball Joint Cap, weighing approximately 0.08 kg (0.18 lb), used for top/bottom dustproof sealing of ball joints, compatible with Cat® steering/suspension/working device ball joint assemblies…

Core Material: Carbon steel stamping + galvanized passivated surface treatment, with nitrile rubber (NBR) O-rings, corrosion-resistant, oil-resistant, suitable for dusty outdoor working conditions in engineering machinery, providing a dustproof seal and ensuring no grease leakage.

Key Dimensions: Inner diameter approx. 38.10 mm (1.50 in), outer diameter approx. 50.80 mm (2.00 in), height approx. 12.70 mm (0.50 in), with internal thread or snap-fit ​​structure, suitable for 38 mm diameter ball joint mounting positions, sealing groove for O-ring wire diameter approx. 2.62 mm.

Structural Features: Stamped cover + built-in O-ring, fixed to the ball joint housing by threads or snap-fit, preventing dust, moisture, and other impurities from entering, while sealing grease, ensuring smooth ball joint rotation and reducing wear.

Compatible Models: Compatible with steering tie rod ball joints, suspension ball joints, boom linkage ball joints, etc. of CAT 140K/160K graders, 420F2/430F2 backhoe loaders, and 908M/909M mini loaders. Commonly used with 077-4329 ball joints and 1P-3703 O-rings (Cat®…).

Accessories: Compatible with CAT 4C-9520 Installation tools and 1P-3703 O-rings are required. Ensure the O-ring is intact, the sealing surface is clean, and the threads/clamps are securely tightened to prevent loosening or seal failure.

Core Functions and Installation Points:

Dustproof Sealing and Lubrication Protection: Seals the internal space of the ball joint, preventing dust, sand, and moisture from entering and causing ball head wear; seals with grease to ensure sufficient lubrication during ball head rotation, reducing friction and extending service life.

Installation Specifications: Clean the sealing surface of the ball head housing, the threads/clamps inside the joint cover, and the O-ring groove. Check the O-ring for damage and aging.

After installing the O-ring, tighten the joint cover using the threads or clips until it is in place. The torque should follow the model manual (usually 8-12 N·m). Avoid overtightening, which may deform the cover, or undertightening, which may cause leakage.

After installation, check the ball head for smooth rotation, ensuring there is no jamming, abnormal noise, or grease leakage.

Maintenance Recommendations: Check the connector cap for looseness, O-ring aging, and seal condition every 500-800 working hours. Replace with genuine parts immediately if looseness, cracks, or leaks are found.

Use only genuine CAT 3Q-0543 parts to avoid malfunctions such as seal failure and premature wear of the ball joint due to size/structure incompatibility.