JLG 4017RS Operator Manual - Manual (Page 33)

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, cab structure and right side
glass or screen 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 the overhead guard or cab structure is damaged, the CAB
CANNOT BE REPAIRED. It must be REPLACED.