Securing excavator pivot pins (used at the boom, stick, bucket linkage, and swing frame) is arguably the most brutal application in heavy equipment maintenance. These joints are subjected to massive cyclical radial loads, high axial thrust, continuous impact shock, and relentless exposure to dirt, moisture, and extreme wear. A zero-clearance fit is vital because any micro-movement leads immediately to pin wear, bushing wear, pin walk-out, and eventual structural failure of the linkage, demanding expensive re-boring and downtime.
INCURE WeldLock™ 356 Retaining Compound (Metallic Grey)
Unlike smaller, precision assemblies, heavy equipment often has larger, unavoidable clearance gaps due to wear, casting tolerances, or non-precision field repairs. While the WeldLock™ 365 is highest strength, the WeldLock™ 356 is superior for this job because it offers high strength coupled with the ability to fill larger gaps (up to 0.25 mm diametral clearance). The metallic fillers in the 356 ensure maximum contact and retention even where surfaces are less than perfectly matched, creating a rigid, high-load bearing bond.
| Feature & Benefit | Technical Insight for Excavator Pivot Pins | Conversion Value |
| Gap Filling Capability | Specifically formulated with metallic fillers to seal and bond clearances up to 0.25 mm, compensating for normal wear and machining tolerances. | Repair & Retain: Achieves high retention strength even on slightly worn or oversized bores. |
| High Shear Strength | Provides high structural strength, resisting axial pull-out and radial shift under massive digging and lifting loads. | Lock Out Movement: Prevents pin rotation and “walking” that destroys bushings and linkage ears. |
| High Temperature Resistance | Withstands continuous operational temperatures up to 200∘C(392∘F), essential for joints that generate friction heat under constant load. | End the Heat Threat: Guarantees the joint won’t fail or soften during continuous heavy use. |
| Vibration & Shock Resistance | Cures to a rigid material that locks the pin rigidly in place, distributing shock loads across the entire surface. | Structural Durability: Reduces shock fatigue on the pin and surrounding structure. |
Application Steps: Locking Pivot Pins for Maximum Structural Service Life
Preparation (Critical): Thoroughly clean both the pivot pin surface and the bore of the linkage or bucket ear. Remove all grease, dirt, rust, and moisture. Use a powerful degreasing solvent (like acetone or industrial cleaner) and wipe until both metal surfaces are perfectly dry.
Application: Apply a continuous, liberal bead of WeldLock™ 356 evenly around the pin surface or the inside circumference of the bore. Ensure the compound completely covers the entire mating area.
Assembly: Insert the pivot pin into the bore. Drive or press the pin until it is correctly seated. Wipe away any excess compound immediately.
Curing Time (Mandatory): Allow a full 24 hours for the compound to reach full cure strength before applying load or operating the excavator. This step is critical to ensure maximum structural integrity.
Stop risking catastrophic linkage failure and ensure your excavator pins are absolutely locked for maximum uptime.