LIFTING MECHANISM
Mast
330
M7.0-1055-010
02 Rev. 5/08
Carriage Removal
•
Raise mast high enough to place two 100 x 100 x
510 mm (4 x 4 x 20 in) hardwood blocks under the
inner mast.
• Attach an overhead lifting device to the carriage
and raise it slightly to get slack in carriage lift
chains.
• Disconnect carriage lift chains.
• Disconnect hydraulic hoses/lines from carriage.
Cap all hydraulic hose/lines.
• Remove inner mast stops located at bottom of in-
ner mast.
• Using overhead lifting device lower carriage and
remove through bottom of inner mast.
• Reverse the above steps to install the carriage.
Carriage Inspection
•
Inspect column rollers for excessive wear or dam-
age. Replace rollers with visible flat spots or
cracks.
• Inspect load roller bearings by turning rollers on
their shafts. Rollers with roughness or noticeable
restrictions to turning should be replaced.
• Inspect all carriage weldments for cracks. Replace
carriage if cracks are visible.
• Inspect chain anchors for wear or damage. Re-
place as needed.
• Inspect side thrust rollers and adjustment.
Lift Chain Tension
Lift chains for the quad mast have been pre-stretched
to help reduce the amount of chain stretch which will
help reduce the amount of adjustments needed. The
following is a guideline to use when verifying lift chain
adjustment on quad mast trucks. Lift chains should be
inspected every 250 hours or 60 days.
• Completely lower mast.
• Raise fork heel 25 mm (1.0 in) off of floor. Refer to
Figure 16951.
Figure 16951
Outer and 2nd Stage Mast Should be Level
(1)
25 mm (1.0 in)
(2)
2 - 3 mm (0.079 - 0.12 in) Above
Outer and 2nd Stage Mast
(3)
2 - 3 mm (0.079 - 0.12 in) Above
3rd Stage Mast
(4)
Floor
Crown 2007 PF15690-10 Rev. 5/08
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