JLG G6-23A Operator Manual - Manual (Page 33)

Section 2 - Pre-Operation and Inspection
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2.5 OPERATOR CAB
The telehandler is equipped with a standard open ROPS/FOPS cab. An optional
enclosed ROPS/FOPS cab is available.
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.