TM 10-3930-653-14&P 11.  Jack or lift the inner channel up and support securely (about 3 feet). 12.  Hydraulically  lift  the  inner  channel  to  gain  access  to the   head   (cross   member   that   supports   the   chain rollers) at the back of the middle  channel.    Remove the four bolts. 13.  Hydraulically lower the piston head to the full lowered position   by   slowly   pushing   forward   on   the   lifting control handle. 14.  Now  you  can  lower  the  middle  channel  below  the stationary    channel    to    gain    access    to    the    inner channel   to   gain   access   to   the   top   rollers   of   the middle channel as well as the wear plates. 15    Assembly is the reverse of disassembly . 4-197