TM10-3930-671-10 Planned Maintenance and Lubrication Lift Chain Lubrication Lift    chain    lubrication    is    an    important    part    of    your maintenance   program.      The   lift   chains   operate   under heavy  loading  and  will  function  more  safely  and  have longer  lift  if  they  are  regularly  and  correctly  lubricated. Clark   chain   lubricant   is   recommended.      It   is   easily sprayed on and provides superior lubrication. Lift Chain Adjustment The  lift  chains  are  correctly  adjusted  if  the  lower  fork carriage rollers reach their end (lowest) position approximately 0.50 inch (13 mm) from the lower edge of the inner rail.  This also positions the bottom of the forks the same (equal) distance above the floor.  To check this dimension,  raise  the  carriage  to  a  height  that  exposes several inches of the inner rail at the roller path.  Apply a layer of grease to the roller path on the inner rail.  Lower the  carriage  and  pick  up  a  rated  capacity  load,  (tilt  the upright back slightly) and raise the load until the carriage rollers  have  passed  over  the  greased  area.    Lower  the load   completely   and   remove   the   load   from   the   forks. Raise  the  carriage  again  to  expose  the  inner  rail.    You can now check the roller path pattern in the grease and determine the correct adjustment of the chains. The lift chains can be adjusted by loosening or tightening the chain anchor nuts. NOTE If the chains show slack due to an increase in length, they should be measured for wear.  When the chains have    stretched    by    wear    more    than    3%    of    their original    length,    they    are    not    safe    and    must    be replaced. E-104