ENGINEMAN 1 & Cthe trials. (Running for a few hours at high powerwill show any possible condition of improper con-tact or abnormal wear that would not have shownup in months of operation at lower powers.)Check the clearance of the main thrust bearing.SAFETY PRECAUTIONSObserve the following safety precautionswhich apply to the operation, care, andmaintenance of reduction gears and related equip-ment found on Navy ships.1. If churning or emulsification of the oil inthe gear case occurs, the gear must be sloweddown or stopped until the defect is remedied.2. If the supply of lubricating oil to the gearsfails, the gears should be stopped and the causelocated and remedied.3. When bearings have been overheated, thegears should NOT be operated—except in extremeemergencies—until bearings have been examinedand defects have been remedied.4. If excessive flaking of metal from the gearteeth occurs, the gears should not be adjusted, ex-cept in case of emergency, until the cause has beendetermined.5. Unusual noises should be investigated atonce, and the gears should be operated cautiouslyor stopped until the cause for the noise has beendiscovered and remedied.6. No inspection plate, connection, fitting,or cover which permits access to the gear casingshould be removed without specific authority ofthe engineer officer.7. The immediate vicinity of an inspectionplate joint should be kept free from paint and dirt.8. When gear cases are open, precautionsshould be taken to prevent the entry of foreignmatter. The openings should never be left unat-tended unless satisfactory temporary closures havebeen installed.9. Lifting devices should be inspectedcarefully before being used and should not beoverloaded.10. Naked lights should be kept away fromvents while gears are in use (the oil vapor may beexplosive).11. Ships anchored in localities where thereare strong currents or tides should take precau-tions and lock the main shafts.12. When divers are in the vicinity of the pro-peller, propeller shafts should be locked.13. When a shaft is allowed to turn or trail,the lubrication system must be in operation.14. The main propeller shaft must be broughtto a dead stop position before an attempt is madeto engage or disengage the turning gear.15. When a main shaft is being locked,precautions must be taken to apply the brakequickly and securely.16. Where there is a limiting maximum safespeed at which a ship can steam with a locked pro-peller shaft, this speed should not be exceeded.17. When the main gears are being jackedover, precautions must be taken to see that theturning gear is properly lubricated.18. Before the main engines are started, itshould be definitely determined that the turninggear has been disengaged.4-16
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