Industrial Gearbox Maintenance Checklist for Plant Engineers
A routine inspection checklist covering oil condition, seals, noise and alignment.
A gearbox that is inspected on a routine round usually runs for years. One that is ignored tends to fail suddenly and expensively. This checklist covers the checks that find most problems early.
Oil level and condition
Check the oil level at the sight glass or dipstick with the gearbox stopped and cold. Look at the oil itself: milky oil points to water, dark and burnt-smelling oil to overheating, and metal flakes or glitter to wear. Take an oil sample for lab analysis on critical gearboxes.
Change oil at the interval in the gearbox manual, or sooner if analysis shows it is needed. Use the grade the manufacturer specifies and do not mix types.
Leaks and seals
Look for oil at the shaft seals, the split line, the drain plug and the breather. A leaking seal lets oil out and dirt in. Replace worn seals, and check the shaft for a groove where the lip has run.
Breather and cooling
A blocked breather builds pressure and pushes oil past the seals. Clean or replace it on schedule. Keep cooling fins and fan guards free of dust, and check cooling water flow where fitted.
Noise, vibration and temperature
Note any change in sound: whining, knocking or grinding. Record the casing temperature at the same point each time and investigate a steady rise. Vibration readings on the bearing housings give an early warning of gear or bearing damage.
Alignment and mounting
Check the coupling alignment between motor and gearbox, and the tightness of the foundation bolts. Misalignment and a soft foot cause bearing and seal failures.
Records
Keep a log of oil changes, temperatures, noise and repairs for each gearbox. Changes over time show more than any single reading.
Key Takeaways
- Check oil level, colour and smell on every round.
- Fix leaks early; keep breathers clear.
- Log temperature and vibration to spot trends.
This article is general guidance. For a recommendation for your own application, contact our engineering team. Gearbox and drive components →