TWO EMPLOYEES WERE MOVING A 15 HP 3600 RPM FRAMEMOTOR. THEY LOWERED THE OLD MOTOR FROM FAN BASE TO THE GROUND WITH A TWO MAN LIFTING BAR. THEY WENT OUTSIDE TO LOWER NEW MOTOR OFF TRUCK ONTO PU LL CART AND MOVED MOTOR INSIDE THE BUILDING AND ONTO BASE WHICH IS ABOUT 12 TO 14 INCHES HIGH. THEY MOVED OLD MOTOR ONTO HAND CART. THEN VICTIM'S BACK STARTED HURTING & IT WAS HARD TO WALK.