Securing loader arm bushings (at the pin joints of the bucket, boom, and lift cylinders) is a heavy equipment maintenance task demanding extreme wear and shock resistance. These joints are subjected to massive cyclical radial loads, high impact shock (during digging and dumping), constant vibration, and exposure to dirt, moisture, and extreme wear. A zero-clearance fit is vital, as any micro-movement leads rapidly to pin wear, bushing spin/walk-out, and eventual structural failure of the linkage bores, requiring costly, complex line-boring repairs.
INCURE WeldLock™ 356 Retaining Compound (Metallic Grey)
In heavy machinery like loaders, the bores often exhibit slight wear, scoring, or casting irregularities. While WeldLock™ 365 is the highest strength for tight fits, WeldLock™ 356 is the optimal choice for this job because it couples high strength with a crucial ability to fill larger gaps (up to 0.25 mm diametral clearance). The metallic fillers in the 356 ensure maximum contact and retention across slightly imperfect bores, creating a rigid, high-load bond that distributes stress across the entire circumference, greatly extending the life of the pin and bushing.
| Feature & Benefit | Technical Insight for Loader Arm Bushings | Conversion Value |
| Gap Filling Capability | Specifically formulated with metallic fillers to seal and bond clearances up to 0.25 mm, compensating for bore wear and machining tolerances. | Repair & Retain: Achieves high retention strength even on worn or oversized linkage bores. |
| High Shear Strength | Provides high structural strength, resisting axial pull-out and rotational slip under massive lifting and digging forces. | Lock Out Movement: Prevents bushing spin and “walk-out” that rapidly destroys the linkage bores. |
| High Temperature Resistance | Withstands continuous operational temperatures up to 200∘C(392∘F), essential for joints that generate friction heat under constant heavy load. | End the Heat Threat: Guarantees the joint won’t fail or soften during continuous heavy use. |
| Shock & Vibration Resistance | Cures to a rigid material that locks the bushing rigidly in place, distributing impact loads across the entire surface. | Structural Durability: Reduces shock fatigue and wear on the entire pin-and-bushing system. |
Application Steps: Locking Loader Arm Bushings for Maximum Service Life
Preparation (Critical): Thoroughly clean both the bushing’s outer diameter (OD) and the linkage bore. 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 bushing’s outer diameter or the inside circumference of the linkage bore. Ensure the compound completely covers the entire mating area.
Assembly: Press or drive the bushing into the bore using the manufacturer’s specified tools. Ensure the component is fully 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, inserting the pin, or operating the loader. This is critical for achieving maximum structural integrity.
Stop risking catastrophic bore damage and ensure your loader arm linkages are absolutely locked and protected.