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10:
Tighten the set screws on the backbone stiffener clamps. Torque the screws to 13.5 Nm (10 ft/
lb).
7.5.4 Installation of Loft Blocks
Note:
Installation
13.5 Nm
Figure 20: Tighten backbone stiffener clamp screws
Loft blocks and other wire rope routing accessories are provided by the installer.
Requirements are:
• Loft blocks must be designed to accommodate 4.76 mm (3/16 in.) wire rope.
Loft blocks designed for 5 mm wire rope are acceptable for use.
• Loft blocks must have a minimum D:d ratio of 25:1. (D:d ratio is the ratio
between the diameter of the block and the diameter of the wire rope.) As this
hoist uses 3/16" wire rope, the minimum diameter of the pulley must be 120
mm (4.72 in.).
• Loft blocks and other routing devices must be rated for the load.
• Loft blocks must be positioned so that the lift lines exiting the hoist must not be
greater than a 2 degree angle in either the horizontal or vertical direction.
• Loft blocks must be positioned so that the lift lines do not intersect each other
or other routing devices.
22
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