TL;DR
Gearbox noise with metal particles in the oil means gear or bearing wear. Sample the oil, check the level, and send the unit to a qualified gearbox shop if particles are found.
What you might see
- whining or grinding from the gearbox housing
- oil temperature rising above normal
- metal particles in the gearbox oil
- noise changes with load rather than speed
Likely causes
Lubricant degraded beyond service life, losing film strength
Oil level below the minimum mark starving the gear mesh
Gear tooth wear or pitting from extended service or contaminated lube
Bearing failure inside the gearbox creating secondary gear load
Required tools
- Oil drain container and funnel
- Clean sample jar
- Heat-resistant gloves
- Replacement lubricant per Lightnin XE specification
- LOTO kit
Safety first
- Gearbox oil is hot after operation. Allow partial cooling and use heat-resistant gloves when draining.
- Do not continue running the mixer if metal particles are found in the oil. Gear fragments can jam the shaft and cause sudden failure.
Procedure
- 1
Stop the mixer and lock out. Wait 10 minutes for the gearbox to cool slightly before opening the oil drain.
Warning: Gearbox oil can be at 80-90 C after running. Use heat-resistant gloves when draining. - 2
Check the oil level sight glass or dipstick before draining. A low level is an immediate finding.
- 3
Drain a small oil sample into a clean jar. Hold it to the light and look for metal particles, milkiness (water contamination), or dark color.[1]
- 4
If particles are visible, do not return the mixer to service. The gearbox requires a teardown inspection by a qualified shop.
- 5
If the oil is only dark or overdue for service, drain completely and refill with the Lightnin-specified lubricant type and viscosity for the XE frame size.[1]
- 6
Check the oil level after filling and confirm it matches the full mark on the sight glass.
- 7
Run the mixer under no-load for 5 minutes and listen for the noise. If it persists after fresh lube, the gearbox internals need professional inspection.
Sources
SPX Lightnin XE Series Industrial Mixer Installation, Operation & Maintenance Manual, SPX Lightnin
SPX Lightnin XE Series Industrial Mixer Installation, Operation and Maintenance Manual, gearbox lubrication type and change intervals (general)
View source
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