Herschell C.V. (Constant Velocity) Joint Grease is a specialized, heavy-duty lubricant fortified with Molybdenum Disulphide (MoS_2), commonly known as "Moly." This 500g tub is specifically engineered to withstand the extreme sliding pressures and high centrifugal forces found in automotive drive shafts and universal joints.
Technical Specifications
- Base: Lithium Soap.
- Solid Lubricant: High-purity Molybdenum Disulphide (MoS_2).
- NLGI Grade: 2 (Medium consistency).
- Color: Dark Grey / Black.
- Temperature Range: -20°C to +130°C.
- Drop Point: > 180°C.
Key Features
- Extreme Pressure (EP) Properties: The "Moly" particles provide a solid lubricating film that prevents metal-to-metal contact even when the base grease is squeezed out under heavy acceleration or sharp turns.
- Anti-Fretting: Designed to prevent "fretting corrosion," which occurs in joints subject to constant, small-scale oscillations and vibrations.
- Shear Stability: Maintains its structure and viscosity even after thousands of kilometers of high-speed rotation, ensuring the grease doesn't turn to liquid and leak out of the boot.
- Water & Oxidation Resistance: Protects the precision-machined steel balls and cages from rust, even if a small amount of moisture enters through a damaged rubber boot.
Common Applications
- Automotive: Inner and outer C.V. joints on front-wheel-drive and all-wheel-drive vehicles.
- Drive Shafts: Lubricating universal joints (U-joints) and slip yokes.
- Heavy Machinery: High-load sliding surfaces, pins, and bushings in construction and mining equipment.
- Steering Linkages: Ball joints and tie-rod ends requiring a "Moly-fortified" grease for longevity.
Usage Tips
- Boot Inspection: Always inspect the rubber C.V. boot for cracks or tears. If the boot is split, the grease will be thrown out by centrifugal force, and grit will enter, destroying the joint regardless of the grease quality.
- Cleanliness is Critical: When repacking a joint, wash out all old grease and contaminants using a solvent like Herschell .A. Weld Cleaner. Even a tiny amount of sand trapped in new grease will act as an abrasive.
- Correct Fill Volume: Do not overfill the boot. Usually, the joint itself should be packed thoroughly, with the remainder of a standard 100g–150g portion placed inside the boot to act as a reservoir.
- Avoid Mixing: Do not mix Moly grease with non-Moly greases (like standard wheel bearing grease) as it dilutes the extreme-pressure protection required for the C.V. mechanism.
