If oil and dust have been allowed to build up, It should be removed with the aid 

 of a solvent, preferably a non-lnf Inntmable one, such as solvent no. 5.. DO NOT USE 

 CARBON tetrachloride! Its fumes are dangerous to breathe and can cause blindness. 

 Uoe solvents with caution; take care not to soak the Insulation on which the sol- 

 vent is apt to have a softening effect. 



When dry, insula- 

 tion handles volt- 

 age easily - - - 



but let It 

 get sonked 

 and - 



voltage may be 

 too much for it 

 to hold. 



Avoid motor locations 

 where dripping, splash- 

 ing, or flooding of water 

 is a possibility. 



Lubricating . Proper lubrication is a very Important step in electric motor main- 

 tenance. It means the use of the right lubricant, in the right amount, and at the 

 right time intervals. Over- lubrication is just ao oerious as under- lubrication. The 

 correct amount of lubricant will remain in the bearings to reduce friction, heat and 

 wear. Manufacturer's directiono should be follovred clooely. If manufacturer's direc- 

 tions are not available, use (if there are oil holes) a light (S.A.E. 10) oil on small 

 motors of less than one horsepower. Use S.A.E. 20 on larger motors that require oil. 

 Always be sure the oil holes are capped or covered, to keep dirt and dust out. 



Metal to metal contact of the brooo sleeve bearing around the steel shaft is prevented 

 by a film of oil. tbtors with sleeve type bearings mny have oil wick- lubricated bear- 

 ings or yam packed bearings. Larger sleeve bearings may have ring oilers in them. 

 Periodic oiling with small amounts of oil for thia type of bearing is necessary. Fre- 

 quency will depend upon the amount of use of the motor. 



Lubrication is far less critical with a ball bearing than with a sleeve bearing motor. 

 Some types of ball bearings are pre- lubricated and sealed by the manufacturer and 

 should not be disturbed. 



Storing . Electric motors should be stored in a dry place and kept free from dirt. 

 The following steps are recoraraended for preparing a motor for storages (a) Wipe the 

 outside of the motor with a cloth to remove dirt and grease, (b) Check bearings for 

 lubrication and add fresh oil or grease as required. (c) Cover the shaft extension 

 with coating of grease to prevent rusting. (d) Wrap the motor with heavy paper to 

 keep dust and dirt from accumulating in it. 



Caring for Commutator and Brushes. Proper care of commutator and brushes is impor- 

 tant to obtain satisfactory service and long life from commutator type motors. Emery 

 paper should never be used for cleaning a corrrmutator since emery dust is a good con- 

 ductor of electricity and may cause short circuits. Badly worn brushes should be re- 

 placed with new ones. It is important to secure the proper brushes from the manu- 

 facturer or motor service agency. 



For further information, sec FE-3, Connecting and Protecting Electric Motors. 



REMEMBER, PROPER CARE MEANS LESS WEAR 



C. A. Johnson 



