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JD 7X30 COUGAR ROT Maintenance Section 4-19
MAINTENANCE
INSPECTION OF ROTARY KNIFE
Failure to follow the following warnings and instructions may result
in serious injury or damage to the equipment or property!
1 – DO NOT weld on the knives or bolts. Damaged or worn knives must be
replaced.
2 – Knives must be replaced in sets. Knives with unequal wear may cause
serious vibration and resulting structural damage to the mower.
3 – The self-locking nuts for the knife mounting bolts must NOT be reused. If the
self-locking nut is removed from the knife mounting bolt, the nut must be replaced
with a new self-locking nut.
4 – Inspect the condition and tightness of the knife mounting bolts and disk mounting
bolts daily.
ROTARY KNIFE REPLACEMENT
1 – Be sure you have a complete matching set of new knives for replacement.
2 – Remove knives and inspect holes for damage. Also watch for cracks in the disk
around the holes.
3 – Install bolt through knife and disk from bottom side of disk. Install new self-locking
nuts and torque them to 1070 dry or 800 oiled ft. lbs. It is recommended that they are
oiled.
4 – The knives should swing freely to absorb shocks from impact when striking
objects.
WHEN CUTTING HEAVY BRUSH, KNIFE BOLTS SHOULD BE
INSPECTED HOURLY AND RETORQUED TO 1070 DRY OR 800
OILED FT. LBS.