New Holland 499 Operator's Manual page 69

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.
SICKLE DRIVE BELTS
Eight pounds force applied to one belt should deflect
the belt 4.8mm (3/16") at mid-span. (3.6 kg deflects
5 mm.)
To tighten the drive belts:
1. Loosen four bolts, 1.
IMPORTANT: Shims, 2, on these four bolts are used
to line up the pulleys. The shims are located between
the frame and mount for the upper pulley. If the shims
are misplaced, check pulley alignment with a
straightedge. Correct any misalignment with the
shims. The number of shims at the top and bottom
may be different.
2. Use nuts on adjusting bolt, 3, to tighten the belts.
3. Tighten bolts, 1, and lock the nuts, 3.
To replace the sickle drive belts:
1. Loosen bolts, 1. Check the number of shims at
the top and bottom bolts.
2. Loosen the belts with adjusting J bolt, 3.
3. Remove bolt, 2.
SECTION 4 - MAINTENANCE
3
10004725
3
10004725
4-9
1
2
1
1
1
7
2
8