JLG 723A Operator Manual - Manual (Page 37)

Section 2 - Pre-Operation and Inspection
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2.5 OPERATOR CAB
The telehandler is equipped with an open or enclosed ROPS/FOPS cab.
WARNING
Never operate telehandler unless the overhead guard and cab structure are in
good condition. Any modification to this machine must be approved by JLG to
assure compliance with ROPS/FOPS certification for this cab/machine
configuration. If damaged, the CAB CANNOT BE REPAIRED. It must be
REPLACED.