TM 10-3930-671-24 2. Lift  each  fork  and  put  a  block  under  it  near  the heel. 3. Push   down   on   tip   of   fork   to   disengage   from carriage.  Move both forks out of the way. 4. Reverse this procedure for fork installation. Carriage Removal (TSU) Triple Stage Upright 1. Apply parking brake and block steer wheels. 2. Start engine, set tilt to 00 vertical, and raise forks a minimum of 6 inches (152 mm). 3. Put a good, substantial pallet under the forks. 4. Turn  key  switch  OFF.    Place  directional  control in NEUTRAL. 5. Lower   carriage   and   forks   onto   the   pallet   and continue    to    lower    until    the    primary    (center mounted)    cylinder    piston    rod    is    completely collapsed into the cylinder. 6. Use  a  C-clamp  to  clamp  one  fork  to  the  pallet. This will prevent carriage from falling over after it is removed from the inner rails. 7. Remove   the   cotter   pins   and   (carriage)   chain anchor   pins,   located   near   the   top   rear   of   the primary cylinder, and disconnect lift chains.  Lay the chains over the carriage. 8. Remove    the    hydraulic    hose    leading    to    the primary  (center  mounted)  cylinder,  at  the  top  of divertor  valve  block,  located  on  the  left  side  of upright. 9. Plug hydraulic line with a #12 plug and put a #12 cap  on  the  divertor  valve  fitting.    Tighten  cap. This   will   allow   hydraulic   raising   of   the   upright without extending the primary cylinder. 10. As  applicable  on  some  models,  remove  upper primary  hose  retainment  bracket  located  on  left underside of top tie bar. 11. Remove  steer  wheel  blocks.    Start  engine  and raise  upright  until  inner  rail  clears  the  rollers  on carriage. Release parking brake and slowly back truck away from  carriage. F-501