Gearbox Routine CM & PM Options

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Return to CM & Lube Newsletter Article - Gearbox Strategy


Failure Mode Group Symptom Group Strat Action Op Frequency PFi Eff Cost Skill
Brg/gear fatigue/wear Brg Temperature PdM Bearing casing temperatures higher speed shafts Op 2 Months P P L CM
Brg/gear fatigue/wear Brg Temperature PdM Bearing casing temperatures lower speed shafts Op 2 Months P P L CM
Brg/gear fatigue/wear Brg Temperature PdM Casing Thermal Image (from all available directions) Op 2 Months P P M CM
Brg/gear fatigue/wear Visual PdM Check build-up or debris around input or output shaft Any 1 Month G P L F, Op
Brg/gear fatigue/wear Lube Wear Debris PdM Removable magnetic Chip collector–Quant. analysis Any 1 month Ex Ex L LT, CM
Brg/gear fatigue/wear Lube Wear Debris PdM Online magnetic debris sensor – simple alarm Any Ex Ex M LT, CMT
Brg/gear fatigue/wear Lube Wear Debris PdM Online magnetic debris sensor – quantitative monitoring Op Ex Ex H LT, CMT
Brg/gear fatigue/wear Lube Wear Debris PdM Automatic Ferro-graphic analysis - Laboratory Op 1 month G G M LT
Brg/gear fatigue/wear Lube Wear Debris PdM Removable magnetic Chip collectors – Visual analysis Any 1 month G G L LT, CM
Brg/gear fatigue/wear Lube Wear Debris PdM Oil sampling & lab analysis including PQ Op 1 Month G G M LT
Brg/gear fatigue/wear Lube Wear Debris PdM Patch testing with microscope analysis – Laboratory Op 1 Month G Ex M LT
Brg/gear fatigue/wear Lube Wear Debris PdM Patch testing microscope & XRF spectro analysis – Lab Op 1 Month G Ex H LT
Brg/gear fatigue/wear Lube Wear Debris PdM Drain plug magnetic chip collector – Visual analysis Any 1 month P P L LT, CM
Brg/gear fatigue/wear High Friction PdM Motor current for no operating load condition IS 1 week OK OK M Op
Brg/gear fatigue/wear High Friction PdM Motor current for known operating load IS Online P P M Op
Brg/gear fatigue/wear HS Gear/Brg Prob PdM Vibration analysis (VA) high speed shafts (data collector) Op 1 Month Ex Ex M CMT
Brg/gear fatigue/wear HS Gear/Brg Prob PdM Online VA high speed shafts Op Ex Ex X Op, CMT
Brg/gear fatigue/wear LS Gear/Brg Prob PdM VA - demodulated vibration all bearing points (DC) Op 1 Month G OK H CMT
Brg/gear fatigue/wear LS Gear/Brg Prob PdM Online VA demodulated vibration (including low speed) Op G OK X CMT
Brg/gear fatigue/wear LS Gear/Brg Prob PdM VA – Time domain analysis all bearing points (DC) Op 2 Months G G H CMT3
Brg/gear fatigue/wear LS Gear/Brg Prob PdM Time synchronous averaging TSA time domain (cyclic) Op 2 Months G G X CMT3
Brg/gear fatigue/wear LS Gear/Brg Prob PdM Online Time synchronous averaging TSA time domain Op G G X CMT3
Brg/gear fatigue/wear LS Gear/Brg Prob PdM Time synchronous averaging TSA (taco input required) Op 2 Months G G X CMT3
Brg/gear fatigue/wear LS Gear/Brg Prob PdM Listening rod (or equivalent) audible noise analysis Op 1 month OK P L L,CM,Op
Brg/gear fatigue/wear Lube Condition PM Change oil including flushing out bottom sludge Isol 2 years G M F, L, LT
Brg/gear fatigue/wear Lube Condition PM Change out 50% of oil volume Isol 2 years G L F, L, LT
Brg/gear fatigue/wear Lube Condition PdM On-site oil mini-lab (oil condition, cleanliness, PQ, etc) Op 1 Month Ex Ex H LT
Brg/gear fatigue/wear Lube Condition PdM Oil sampling with lab lube condition assessment Op 6 Months Ex Ex M LT
Brg/gear fatigue/wear Lube Condition PdM Portable FTIR monitoring (lube condition) Any 1 year Ex G H LT
Brg/gear fatigue/wear Lube Condition PdM Portable oil dialelectric testing (lube condition) Any 1 year G OK M LT
Brg/gear fatigue/wear Lube Condition PdM Oil sample on change out with lab oil analysis Isol 2 years P P L F, L, LT
Brg/gear fatigue/wear Lube Contam. PM Oil filtration with mobile filter cart Any 2 Months Ex H LT
Brg/gear fatigue/wear Lube Contam. PM Strip, inspect and replace seals Isol 10 years P X FG
Brg/gear fatigue/wear Lube Contam. PdM Check breather desiccant colour change. Change if req. Any 1 Month Ex G L F
Brg/gear fatigue/wear Lube Contam. PdM Patch testing on-site- comparison chart ISO cleanliness Op 1 Month Ex Ex L LT, CMT
Brg/gear fatigue/wear Lube Contam. PdM On-site portable sensor ISO cleanliness analysis system Op 1 Month Ex Ex L LT, CMT
Brg/gear fatigue/wear Lube Contam. PdM Online particle counting cleanliness analysis system Op Ex Ex H LT, CMT
Brg/gear fatigue/wear Lube Contam. PdM Oil sampling with lab particle count-ISO cleanliness code Op 2 Months Ex G M LT
Brg/gear fatigue/wear Lube Contam. PdM Test input & output shaft seals (pressure test) OS 1 year G OK L CMT
Brg/gear fatigue/wear Lube Contam. PdM Bottom Oil sampling with visual analysis Any 2 years OK G L LT
Brg/gear fatigue/wear Lube Contam. PdM Lowest point drain sight glass (Water check) Any 1 Month OK OK L F, Op
Brg/gear fatigue/wear Lube Temp PdM Oil Temperature or equivalent (eg. lower casing temp) Op 1Month F, Op
Brg/gear fatigue/wear Lube Temp PdM Oil Temperature - Online Op Op
Brg/gear fatigue/wear Poor Condition PM Remove, strip, inspect, NDT gears and replace seals Isol 10 years G X FG
Brg/gear fatigue/wear Poor Condition PM Strip, inspect, NDT gears, replace bearing & seals Isol 10 years G X FG
Brg/gear fatigue/wear Poor Condition PM Replace with a new gearbox Isol 10 years G X FG
Brg/gear seizure Lube Level PdM Oil level check & filtered top up if required Op 1 Month Ex G L F, Op
Brg/gear seizure Lube Level PdM Check for visual indications of oil leaks Op 1 Month G G L F, Op
Coupling failure ? PdM Coupling checks (depending on coupling type) Isol 1 Year ? ? ? F
Coupling Inefficiency Coupling Temp PdM Non-contact temperature of input coupling Op 2 Month Ex Ex L CM
Coupling Inefficiency Coupling Temp PdM Non-contact temperature of output coupling Op 2 Month Ex OK L CM
Coupling Inefficiency Coupling Temp PdM Thermal Image of input & output coupling Op 2 Month Ex OK M CM
Worm wheel wear Worm Backlash PdM Measure worm backlash angle Isol 1 year Ex G L FG
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