Gearbox Troubleshooting
The most common gearbox problems on the plant floor, with the likely causes and the fix for each. Part of the OEE Lab directory of 301+ documented problems.
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Problems on this page:
Overheating
Hits OEE: AvailabilitySymptoms: High case temperature, thinning oil, discolouration.
Prevention: Oil level/analysis, correct lubricant, load and breather checks.
Noise or whine
Hits OEE: QualitySymptoms: Whine, growl or knocking that changes with speed/load.
Prevention: Oil analysis, vibration checks, alignment, contamination control.
Oil leak
Hits OEE: AvailabilitySymptoms: Oil around seals/joints, dropping level, housekeeping/slip hazard.
Prevention: Seal inspection, keep breather clear, correct fill level.
Oil leakage
Hits OEE: AvailabilitySymptoms: Oil around seals or joints, falling oil level, contamination risk.
Prevention: Seal and breather maintenance, correct oil level and grade.
Gearbox troubleshooting FAQ
Gearbox: what causes overheating, and how do I fix it?
Symptoms: High case temperature, thinning oil, discolouration. Likely causes: Overfilled or low oil; Wrong lubricant; Overload; Blocked cooling/breather. Fixes: Set oil to the correct level; both extremes cause heat. Use the specified grade/viscosity. Confirm load within rating; check service factor. Clean cooling surfaces; clear the breather. Prevention: Oil level/analysis, correct lubricant, load and breather checks.
Gearbox: what causes noise or whine, and how do I fix it?
Symptoms: Whine, growl or knocking that changes with speed/load. Likely causes: Worn/pitted gears; Bearing wear; Backlash/misalignment; Low/contaminated oil. Fixes: Inspect gear teeth; replace worn gearsets. Identify and replace failing bearings. Check and reset backlash; align input/output. Top up or change oil; investigate contamination source. Prevention: Oil analysis, vibration checks, alignment, contamination control.
Gearbox: what causes oil leak, and how do I fix it?
Symptoms: Oil around seals/joints, dropping level, housekeeping/slip hazard. Likely causes: Worn input/output seals; Blocked breather (pressure build-up); Overfilled oil. Fixes: Replace shaft seals; inspect shaft surface. Clean/replace the breather to relieve pressure. Drain to correct level. Prevention: Seal inspection, keep breather clear, correct fill level.
Gearbox: what causes oil leakage, and how do I fix it?
Symptoms: Oil around seals or joints, falling oil level, contamination risk. Likely causes: Worn shaft seals; Blocked breather (pressure build-up); Overfilling or wrong oil. Fixes: Replace the input/output seals; check shaft condition. Clean or replace the breather to relieve pressure. Set the correct level and grade; check the gasket/joints. Prevention: Seal and breather maintenance, correct oil level and grade.
Stop the same fault coming back
Recurring gearbox stops usually trace to a cause you cannot see by hand. The partner we recommend is Fabrico: EU-built, so your production data stays in EU jurisdiction, with computer-vision true-cause of micro-stops, a closed loop from PLC-read OEE to an auto-routed work order, and ISO 27001 / 20000-1 / 9001 (supports audit-readiness).
See how Fabrico finds root causeRelated tools: full troubleshooting directory · OEE calculator · downtime cost · MTBF / MTTR · glossary
Methods that cut recurring stops: the six big losses · root cause analysis · preventive vs predictive maintenance · TPM · SMED & changeover