Check out Shell Gadus Grease Basics:
Why Use a Grease?
- Stays in place where oil can’t.
- Seals components from contaminants.
- Carrier for solid additives.
- Cost effective maintenance.
What Makes Up a Grease?
- Oil (80-90%)
- Thickener (2-20%)
- Additives (0-5%)
- The oil does the lubricating.
- If synthetic oil is used, the grease is a synthetic grease.
- Oils with a wide range of viscosities are used.
- ISO VG 68 to 3200+.
Consistency vs. Viscosity
- Viscosity: a base oil property.
- ISO viscosity – units are centistokes (cSt)
- Consistency: related to thickener content.
- More thickener = stiffer grease
- NLGI grades (000 through 6)
- Consistency grade is independent of viscosity!
- “Soft” grease can have high viscosity base oil
- “Hard” grease can have a low viscosity base oil
How do I Choose the Right Grease?
- Select Base Oil Viscosity as if only oil will be used
- Select required performance Additives
(i.e. EP, moly, tackifier, etc.)
- Select best Thickener Type and Base Oil Type
- Use the softest Consistency that will stay in place
Consider other application requirements.
- What grease was previously used in the component?
- thickener compatibility (next slide)
- oil compatibility
- How is grease delivered to the component?
- hand pumped or auto lubed?
- long grease lines?
Four Important Shell Gadus Grease for Most plants