Cub Cadet 7530 Operator's Manual page 59

POWER TAKEOFF GUARDS
All tractors have a safety guard for the Rear PTO shaft and safety cover
for the Mid PTO shaft.
REAR PTO GUARD
Whenever a PTO driven machine is in operation, the PTO guard
must be in place for most operations to prevent injury to the operator
or bystanders. Where attachments, such as pumps, are installed on
the PTO shaft (especially if the tractor PTO guard is moved upward
or removed) extended shielding equivalent to the PTO guard must be
installed with the attachment. Install the PTO guard to its original
position immediately when the attachment is removed.
OPERATING INSTRUCTION
51