New Holland 499 Operator's Manual page 21

TO BLEED AIR FROM THE LIFT
CYLINDERS:
Loosen the hose swivel fitting, 1, at the upper end of
the slave cylinder.
NOTE: Use a shop rag or other shielding means for
protection from seeping oil at loosened fittings.
Actuate the tractor hydraulic lever and extend the
master lift cylinder until oil flow from the loosened
fitting is free of air. Then tighten the fitting.
IMPORTANT: If the cylinders do not extend far
enough to release the transport stops, air remains in
the hydraulic system and must be purged. If the right
(master) cylinder does not extend far enough to
engage the right transport stop, lower the header all
the way to the ground. A timing notch inside the
cylinder will allow excess oil to drain from the slave
cylinder. Raise the header again to engage both
transport locks.
Raise and lower the header several times until all air
is purged from the system. Repeat the previous
steps if necessary.
WARNING
Before pivoting the tongue, be sure the header
will clear any obstructions. Stand clear of the
machine when pivoting the tongue. Air in the
system or high hydraulic flow rate can cause
erratic operation. Failure to comply may cause
death or serious injury.
Disengage the spring-loaded lock pin, 1, and pivot
the header from full left to full right and back several
times to purge air from the lines.
SECTION 1 - GENERAL INFORMATION
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