Publish Time: 2026-08-12 Origin: Site
Slewing bearings are critical load-bearing and rotating components for engineering machinery, wind power, and port equipment, whose anti-rust condition directly determines equipment stability and service life. Recently, we received feedback from our Bulgaria customer that individual slewing bearings suffered slight rust after long-term warehouse storage.
It is commonly misunderstood that factory anti-rust oil and sealed packaging allow permanent maintenance-free storage. In fact, standard factory rust-proof treatment only guarantees effective protection for 3–6 months. Affected by long sea transportation, slow inventory turnover, large temperature differences and high humidity in Bulgaria, moisture accumulates inside sealed packages, causing the anti-rust oil to fail gradually. This leads to oxidation and rust on raceways, gear surfaces and metal exposed areas, which may affect assembly accuracy and equipment operation.
The root cause lies in expired protective layers and insufficient regular inspection during long-term sealed storage. To solve this problem for overseas long-storage scenarios, we have standardized a complete set of maintenance procedures including unpacking inspection, cleaning and secondary anti-rust oil re-coating.
Standard Long-Term Storage Maintenance Procedure
1. Regular unpacking and full inspection
For bearings stored over 6 months, remove pallet fixing and packaging to release long-term compression stress. Check raceways, gear surfaces and flanges for rust, moisture and grease deterioration, and verify rotating flexibility to avoid static deformation.
2. Professional cleaning and secondary oiling
Clean residual old oil, dust and moisture thoroughly. After full drying, re-apply high-performance long-term anti-rust oil to restore a stable protective layer suitable for humid overseas environments.
3. Standardized re-packaging and periodic maintenance
Repack and store products in dry, ventilated and non-corrosive warehouse conditions. We recommend inspection and re-oiling every 6 months for regular overseas storage, and every 3 months for high-humidity regions.
Quality assurance covers the full lifecycle from production, shipping to overseas storage. Based on global customer feedback and diverse overseas climate conditions, we continuously optimize our packaging and maintenance standards. By implementing standardized long-term storage inspection and secondary anti-rust treatment, we effectively eliminate storage rust risks and deliver stable, high-quality slewing bearings for global clients.