Proper storage of gearboxes

Proper storage of gearboxes is critical to ensure their reliability when they are put into service after an extended period. Here are some guidelines for long-term gearbox storage:

1. Lip Seals Method:

• Spray shaft extensions with a suitable dry film or similar preservative (e.g., Castrol Rustilo 181, ESSO Rust BAN 397, Valvoline Tectyl 846).
• Pack grease around oil seals to prevent drying and cracking.
• Fill the gearbox casing completely with oil and seal it tightly. Label the gearbox as “FULL – not ready for service.”
• Replace the breather with an airtight plug to prevent leaks.
• Note: This method can be expensive for large gearboxes and may cause hazards if accidental leaks occur

2. Labyrinth Seals Method:

• Similar to the lip seals method, spray shaft extensions with a suitable dry film preservative.
• For gearboxes with non-contact labyrinth seals, use internal vapor-phase rust protective coating instead of complete oil fill.
• Consider using commercial vapor phase rust inhibitors (e.g., Ashland Oil, Tectyl 859A, Cortec VP corrosion inhibitor).
• Add 5 percent of the oil volume with the inhibitor.
• Renew this method if storage period exceeds six months.

3. Oil Mist Method:

• Suitable for large gearboxes with lip or labyrinth seals.
• Introduce a clean air/oil mist mixture (1 part oil to 200,000 parts air) into the gearbox headspace.
• Protects gear and bearing surfaces, keeps them lightly lubricated, and prevents corrosion.
• Safe, non-hazardous, and won’t support combustion.
• More expensive and challenging to implement.

Maintenance During Storage:

• Rotate the shafts at least once a month to distribute oil and prevent false brinelling and fretting corrosion.
• Inspect protective coatings on exposed surfaces.
• Avoid storing gearboxes on vibrating surfaces to prevent false brinelling and fretting corrosion.

Remember to choose the method that best suits your gearbox type and storage conditions. If you have specific gearbox models, consult the manufacturer’s recommendations for optimal storage procedures. ?????