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6.5.4 Replacing rollers of masts
(1) Take apart the fork bracket from the inner mast, then replace the main roller
follows the way as 6.5.3.
(2) Park the truck on the horizontal ground and lift up the front-wheel 250～300mm
from the ground.
(3) Pull parking brake level fully, and use a wedge to make back-wheel stationary.
(4) Take apart bolts which fastened lift cylinders and the inner mast. Hang up the
inner mast without losing shims of the piston rod heads carefully.
(5) Take apart bolts which jointed lift cylinders and the bottom of outer mast and take
apart the oil-pipe between two lift cylinders without loosing the nipple.
(6) Let down the inner mast and dismantle inner mast lower end main roller.
(7) Main rollers on the upper outer mast will be showed on the top of the inner mast,
then main roller can be removed.
(8) Replacing main rollers
a) Take apart the upper main rollers without losing shims.
b) Fit the new main roller and shims together on the outer mast.
(9) Hang up the inner masts and let all rollers in the inner mast.
(10) Assembly the lift cylinder and the lift bracket as disassembly contrarily.
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