Progressive Turf Equipment SDR 90 - Manual (Page 18)

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MAINTENANCE :
WARNING - Turn tractor engine off before performing any
maintenance.
CAUTION - Always use personal protection devices such as eye and
ear protectors when performing maintenance functions.
WARNING - When completing a maintenance or service function,
make sure all safety shields are installed before placing mower in
service.
BLADE SERVICING :
WARNING - Be sure safety locks are in place when working on
decks in the raised position. The tractor hydraulic system could fail,
causing decks to fall and crush anything under them.
 Do not handle mower blades with bare hands. Careless or improper handling
may result in serious injury.
 Inspect blades before each use to determine that they are mounted tightly and are
in good condition. Replace any blade that is bent, excessively nicked, worn or has
any other damage. Small nicks can be ground out when sharpening.
WARNING - Only original equipment blades should be used when
replacing worn out mower blades. They are made of special steel
alloys and subjected to rigid heat-treat and inspection requirements.
Substitute blades may not meet these rigid specifications and MAY BE
DANGEROUS.