Lubricating a cojinete de giro is critical for ensuring smooth operation, reducing wear, and extending its service life. Here’s a step-by-step guide on how to properly lubricate a slewing bearing.
There are generally two main areas that require lubrication:
The Raceway: This is where the rolling elements (bolas o rodillos) run between the inner and outer rings.
The Gear Teeth: If the slewing bearing has integrated internal or external gear teeth.
Key Principles:
Right Lubricant: Using the correct type and grade of grease is paramount.
Right Amount: Too little or too much can cause problems.
Right Frequency: Lubrication intervals depend heavily on operating conditions.
Right Method: Applying the grease correctly ensures it reaches the critical areas.
Limpieza: Contamination is a major enemy of bearings.
Slewing bearing lubrication
I. Preparación & Seguridad:
Consult the Manufacturer’s Manual: THIS IS THE MOST IMPORTANT STEP. The equipment or bearing manufacturer’s manual will specify the exact type of grease, the recommended lubrication frequency, and potentially specific procedures or grease fitting locations. Always prioritize their recommendations.
Seguridad ante todo:
Ensure the machine is shut down, de-energized, and properly locked out/tagged out (LOTO) according to your site’s procedures before performing any maintenance.
Wear appropriate Personal Protective Equipment (EPP), including safety glasses and gloves.
Gather Supplies:
Correct type and grade of grease (as specified by the manufacturer, typically an EP lithium complex grease, often NLGI Grade 2).
Grease gun (manual or powered). Ensure it’s clean and loaded with the correct grease. Avoid mixing different grease types.
Clean rags or cloths.
Solvent (if needed for cleaning gear teeth, ensure compatibility).
Stiff brush (for cleaning gear teeth, si es aplicable).
Small tool or pick (for cleaning grease fittings).
II. Lubricating the Raceway:
Locate Grease Fittings: Find the grease fittings (zerks) located around the circumference of one of the bearing rings (usually the stationary one). There may be one, two, or several fittings spaced evenly.
Clean Fittings: Thoroughly clean the grease fittings and the area around them with a clean rag. Use a pick to remove any hardened grease or dirt from the fitting opening. This prevents contaminants from being injected into the bearing.
Attach Grease Gun: Securely attach the grease gun coupler to the fitting.
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