Securing the drive components onto a power steering pump shaft (such as a pulley, drive gear, or coupling hub) is a demanding retention application. This joint is subjected to heavy side loads (from belt tension), significant torsional stress (driving the pump), and continuous vibration and heat. Maintaining a zero-clearance fit is vital to prevent component slip, fretting corrosion, and potential misalignment that can lead to excessive noise and premature pump failure.
INCURE WeldLock™ 365 Retaining Compound
For securing drive components onto the pump shaft—where maximum shear strength and resistance to side load and slip are paramount—the WeldLock™ 365 provides the highest structural integrity. Its superior strength ensures the pulley or gear cannot spin or walk off the shaft, maintaining precise alignment and preventing loss of hydraulic pressure.
| Feature & Benefit | Technical Insight for Pump Shaft Assemblies | Conversion Value |
| Highest Strength (365) | Cures to an extremely high-shear strength, rigid plastic, providing maximum resistance to torsional slip and heavy radial belt/gear load. | Zero Slippage: Guarantees absolute, 100%torque transmission and prevents fretting corrosion. |
| High Temperature Resistance | Withstands continuous operational temperatures up to 200∘C(392∘F), essential for pumps exposed to engine heat and fluid friction. | End the Heat Threat: Ensures the bond remains strong and rigid under maximum thermal load. |
| Fills Close Clearance Gaps | Ideal for components with an interference or true close-tolerance slip fit (less than 0.05 mm diametral clearance) typical of precision pump builds. | Maximizes Contact: Converts the fit into an integrated component, optimizing balance and concentricity. |
| Fluid Immunity | Inert to power steering fluid (hydraulic oil) and engine oil, ensuring the integrity of the joint is protected. | Reliability Assured: The bond remains permanently intact despite fluid saturation. |
Application Steps: Locking Pump Shaft Components for Maximum Reliability
Preparation (Essential): Thoroughly clean both the component bore (pulley/gear) and the pump shaft surface. Remove all oil, grease, and residue. Use a degreasing solvent (like acetone or brake cleaner) and wipe until both metal surfaces are perfectly dry.
Application: Apply a continuous, liberal bead of WeldLock™ 365 evenly around the pump shaft surface. Alternatively,apply it to the inside circumference of the component bore. Ensure the compound completely covers the mating area.
Assembly: Press or slide the component onto the shaft. Ensure the component is seated correctly (axially) and wipe away any excess compound immediately.
Curing Time (Mandatory): Allow a full 24 hours for the compound to reach full cure strength before installing the belt,introducing fluid, or operating the pump under load.
Alternative Consideration (Worn or Large Gaps): If the bore-to-shaft clearance is larger (up to 0.25 mm), use INCURE WeldLock™ 356 (Metallic Grey). This compound is formulated with metallic fillers to tolerate larger gaps while still providing high retention strength.
Stop risking component slip and ensure your power steering pump assemblies are absolutely secure.