New Holland 499 Operator's Manual page 96

WARNING
Disengage the PTO, turn off the tractor engine
and remove the key. Wait for all movement to
stop before leaving the operator's position.
Never adjust, lubricate, clean or unplug machine
with the engine running. Failure to comply could
result in death or serious injury.
KNIFE TIMING (COUNTERSTROKE)
IMPORTANT: Both knife assemblies must reach the
inner end of their strokes at the same time or there
will be long stubble at the center of the swath or under
the windrow. If the knives are out of time, severe
vibration may damage the header or reel.
To time the knives:
1. Rotate the conditioner rolls by hand until the right
knife assembly is at the inner end of its stroke.
2. Loosen three bolts, 1.
3. Without moving the right knife, rotate the hex
shaft and hub, 2, in relation to hub, 3, until the left
knife is at the inner end of its stroke. Tighten the
bolts securely. Hardened washer, 4, must be in
place.
NOTE: While tightening bolts, 1, hold the two shafts
parallel.
NOTE: A similar coupler at the left sickle drive
gearbox provides additional adjustment.
SECTION 4 - MAINTENANCE
1
10004730
4-36
4
3
2
51