TM 5-3895-374-24-1GP255FHC.Pull the shaft from the impeller DONOTREMOVETHESTUDORLOCKNUTATTHECENTEROFTHEIMPELLER.D.Inspect the impeller hub. Clean any dirt or burrs from inside of hub bushing.E.Clean any burrs from shaft of the existing or new motor which may have been caused by setscrews Ifnecessary, use an emery cloth to restore a smooth surface.F.Apply an antiseize compound to the impeller hub bore and shaft.G.Place the motor on the blower base and slide the impeller onto the shaft.H.Replace and securely tighten the four nuts and bolts which fasten the motor to the blower base.I.Slide the impeller back and forth on the shaft and position at the mid-point of its travel.J.Tighten the three impeller setscrews. (Refer to Maintenance Section ).K.Rotate the impeller by hand to ensure that there are no restrictions to its free running.L.After one week of operation, recheck the setscrews and tighten if necessary.FOR BELT DRIVE MODELS ONLY:CAUTIONEnsure that electrical power cannot be accidentally applied to the motor during disassembly.A.Remove the belt guard.B.Loosen the motor mounting bolts to allow movement of the motor assembly.C.Release the belt tension and remove the belts.DLoosen and remove the sheave on the motor shaft.E.Remove the four nuts and bolts which fasten the motor to the Z bar mounting bracket.F.Repair or replace the motor, as required.G.Place the motor on the Z bar mounting bracket and securely fasten It in place. H.Securely fasten thesheave to the motor shaft. CHECK THE ALIGNMENT BETWEEN THE IMPELLER AND MOTOR SHEAVESWITH A STRAIGHT EDGE OR PIECE OF STRING DRAWN TAUT ALONG THE FACES OF THE SHEAVES.The motor shaft must be level and parallel to the impeller shaft.I.Replace the belts and adjust them for the proper tension as described in steps 10E and 10F underINSTALLATION.J.Tighten securely all motor mounting bolts.K.Replace the belt guard.The bearings In the motor have been lubricated by the motor manufacturer. The re-lubrication guide attached to the motorshould be followed. Generally the grease packed bearings have been lubricated to provide 1-2 years of continuousservice, without re-lubrication, in a moderately clean indoor atmosphere.IMPORTANTPacking too much grease into a bearing Is a major cause of motor bearing failure. Be sure tofollow the manufacturer’s recommendations for proper motor maintenance.A Troubleshooting Checklist is provided as an attachment to these Instructions.(page 3-547)
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