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DETERMINING THE STOKE OR AMPLITUDE
BEARING REMOVAL AND INSTALLATION

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 D.  SCREEN VIBRATOR BEARING TEMPERATURES The screen vibrator unit, by reason of its functional purpose, is subjected to strain.  For this reason frequent and regular inspection should be made to be sure that all cap screws securing the bearing housing flanges and mounting connections are kept tight. 1. CHECKING BEARINGS The bearings normally operate at a temperature of 1000 to 180°.  If a bearing is running at temperatures in excess of 1800, it is considered as over-heating and the cause should be found and corrected to prevent damage. a.    A magnetic type thermometer provides the best method of checking bearing temperatures.  Place thermometer on bearing  housing  close  to  bearing  immediately  after  stopping  screen.    Temperature  will  increase  slightly  above operating temperature for approximately the first five minutes. b.    Bearing temperatures can be checked by placing the hand on the bearing cartridge or housing; if the hand can be held there for a few seconds the bearing is not too warm.  However, make all final checks with a thermometer. 2.    BEARING HEATING CAUSES a.    Most common causes  of  overheating  is  too  much  lubricant  and  most  generally  occurs  when  the  unit  is  new  or immediately after lubricant has been changed. b.    Incorrect  type  or  grade  of  lubricant  can  cause  overheating  and  improper  lubrication  of  bearings.    Always  use recommended lubricant. c.    The bearings will overheat if the screen is operated faster than recommended.  Check the speed with the speed indicator and correct if necessary. d.    A broken or improperly adjusted spring will create a condition that can cause the vibrator unit bearing to overheat. e.    Overheating is also a sign when bearing failure is developing.  Check the overheating bearing for wear.  It will be necessary to partially disassemble unit to expose bearing presumed failing, and by placing a pry bar under shaft check movement of shaft. page 3 - 1287







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