7.2.4 Replace rollers (Fig7.6)
(1) Use the same way as 7.2.3 to disassemble the lift bracket from the inner mast.
(2) Let the truck parking on the horizontal ground and wedge up the front wheels for
250mm to 300mm.
(3) Apply the parking brake and wedge up the rear wheels.
(4) Disassemble the bolts which fasten the lift cylinder and the inner mast. Hang up
the inner mast not to loose the shims of the piston rod heads.
(5) Disassemble the connecting bolts for the lift cylinder and the bottom of the outer
mast. Disassemble the lift cylinders and the oil pipes between the two cylinders without
loosen the oil pipe joints.
(6) Main rollers on the upper outer mast will be showed on the top of the inner mast
as soon as main rollers were taken apart from bottom of the inner mast after laying down
the inner mast.
(7) Replace the main rollers.
·Disassemble the upper main rollers with a drawing tool, don’t loose the adjust shims.
·Install the new rollers and the shims disassembled before.
(8) Hang up the inner mast to let all the rollers in the mast.
(9) Reassemble the lift cylinder and the lift bracket.
Fig 7.5 Fig 7.6
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