JLG 642 Operation & Safety Manual page 125

Installation Procedure:
• Ensure carriage is properly installed. Refer to "Attachment Installation" on page 5-9.
• Ensure length and cross section of the parent fork arm is equal to or exceeds the
parent fork arm blade length stamped into the fork extension.
• Secure the fork extensions to the forks by sliding the fork extensions onto the parent
forks and install the retaining pin behind the vertical shank of the fork.
Operation:
• Heavy part of load must be against carriage backrest.
• Do not allow load center of gravity to be in front of tip of the supporting fork.
• Do not pick up a load or pry materials with tip of fork extensions.
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Section 5—Attachments
5-31