69
fi g. 5.1
fi g. 5.2
5 - M
AST
AND
M
AST
T
IES
1-
To connect one mast section to another, align the mast section to be installed on top
of the bottom mast section. Insert the anti-error stubs on top of the bottom section
into the bottom tubes of the section to be installed, making sure the mast sections
line up square and that rungs for the hooks are on the same side.
2-
Flip the 5/8" x 6 1/2" toggle bolt, mast clamp and fl ange nut onto the
connecting lug and tighten by hand. Perform this operation for all
four (4) corners.
3-
Tighten all toggle bolts to 120 lb-ft (163 N-m) of torque. Use a
cross-pattern sequence when tightening (fi g. 5.1).
4-
Repeat steps 1, 2 and 3 for each mast section to be installed at every
5' (1,5 m) of rise. Install mast sections alternately – on one mast, then
on the other.
5-
For faster assembly, lengths of mast sections can be pre-assembled (also referred
to as "sticks"). The length of pre-assembled mast allowed is equal to the height in
feet (meters) authorized between tie levels for the installation. For more information
about tie levels, refer to the
Mast Tie Installation Schedule
on p. 70 of this section.
It is recommended to use an optional multiple mast handler to handle pre-assembled
lengths of mast sections. For instructions on the use of the optional mast handler,
refer to p. 117 of the
Accessories
section.
6-
Always make sure that the mast assemblies are plumb on both the front and side
axis.
7-
It is important to make sure to verify the mast bolts on each mast when lowering
the platform to make sure they are in good condition and tightened to the proper
torque, especially on
brand
-
new mast sections
, as the galvanized coating may have
compressed. In all cases, mast bolts must be tightened to a torque of 120 lb-ft (163 N-m).
Failure to tighten bolts properly may lead to serious injury or death.
Masts and Mast Ties
Installation of a mast section
The installation of mast sections must be performed with care. The front face of mast
sections must always be parallel to the face of the work. It is important to verify that each
mast remains parallel throughout the installation of mast sections.
Mast sections loaded on the motorized unit using a crane or a rough terrain forklift
must
be stored horizontally on the motorized unit to ensure good balance
. Refer to the
Load Capacities
section on p. 80 for more information about loading the motorized unit.
WARNING
It is important to make sure to verify the mast bolts when lowering the platform
to make sure they are in condition and are tightened to the proper torque,
especially on
brand
-
new mast sections
, as the galvanized coating may have
compressed.
