TM 10-3930-653-14&P 8. Jack the inner rail or lift the rail with a  hoist  enough to  get  access  to  the  main  chain  anchor  blocks  in back of the inner channel. 9. Remove    the    chains,    the    blocks    and    the    hose mounting bracket. 9A.  Now  the  inner  channel  can  pass  below  the  middle channel. 10.  Lower  the  inner  channel  to  gain  access  to  top  and bottom  rollers  and  the  top  wear  plates.  Replace  or adjust as necessary. 4-196