Hyundai 35DS-7 Operation Manual page 240

(3) 3 stage mast(TF mast)
Remove the carriage assembly and
move to one side.
Loosen and remove hexagon bolt
securing bottom cylinder from outer mast.
Loosen and remove bolts and special
washers securing lift cylinders to middle
mast.
Attach chains or sling to the inner and
middle mast section at top crossmember.
Using an overhead hoist, slowly raise the
uprights high enough to clear lift cylinder.
After lowering the lift cylinder rods, and
disconnecting lift cylinder hose, tilt the lift
cylinders LH and RH and tie them with
ropes to the outer mast.
Using the overhead hoist raise inner and
middle masts. Place 4 inch block of
wood under the free lift cylinder bracket of
the inner mast then lower mast sections
(this will create slack in the chains).
Remove retaining rings securing chain
sheaves to sheave support brackets.
While support chains, remove chain
sheaves and let chains hang free. The
upper outer and lower middle mast rollers
and back up liners are now exposed.
Using a pryer, remove load rollers from
load bracket. Remove back up liners and
shims.
Attach chains or sling to the middle mast
section at top crossmember. Using an
overhead hoist, slowly raise the middle
mast until top and bottom rollers are
exposed.
Using a player, remove load rollers from
load roller bracket.
Thoroughly clean, inspect and replace all
worn or damaged parts.
Reverse the above procedure to
assemble. Refer to MAST LOAD
ROLLER ADJUSTMENT paragraph.
Backup
liner
8-15
Chain
D357MS18