The economic lifespan of a slewing ring is directly linked to correct lubrication intervals and bolt torque control. While the general rule is lubrication every 100 operating hours, in dusty or saline environments this interval should be shortened by 20%. Calcium sulfonate complex grease with EP additives, NLGI Grade 2, and base oil viscosity ≥150 cSt @ 40 °C provides superior corrosion resistance.
During grease injection, the ring should be rotated slowly to ensure the lubricant film covers all rolling elements. Bolts must be tightened in a star sequence over three passes: 30%, 60%, and 100% of nominal torque. Typical values: M20 – 580 Nm, M24 – 1000 Nm, M27 – 1500 Nm. If the bearing has been exposed to water or steam cleaning, new grease should be applied within 30 minutes to prevent micropitting.
Automatic lubrication systems with single-line progressive distributors pay back their investment within 14 months. Weekly monitoring of vibration, temperature, and grease consumption, logged into a CMMS system, allows trend analysis to detect potential failures weeks in advance. This enables predictive maintenance planning, minimizing unplanned downtime costs.