SECTION 00 - GENERAL INFORMATION - CHAPTER 1
00-18
BLEEDING AIR FROM THE LIFT
CYLINDERS
WARNING
Disengage the PTO, turn off the tractor engine
and remove the key. Wait for all movement to
stop before leaving operator’s position. Never
adjust, lubricate, clean or unplug machine with
the engine running. Failure to comply could
result in death or serious injury.
If the lift cylinders do not lift the frame evenly or if one
side lifts higher than the other, rephase the cylinders
by lowering the mower-conditioner and continue to
hold the tractor valve in the lower position for 10 to 15
seconds, or raise the mower-conditioner and
continue to hold the tractor valve in the raise position
for 10 to 15 seconds. If the cylinders do not extend far
enough to release the header lift locks, there may be
air in the hydraulic system that must be purged.
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.
With the tractor engine at a low idle, move the tractor
hydraulic lever to the raise position to 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 header lift locks, air remains in
the hydraulic system and must be purged. If the
header lift lock on the master cylinder side does not
release, excessive oil may be in the slave cylinder
circuit. Bleed this oil until both lock rods are engaged
on their respective stop blocks.
Raise and lower the header several times until all air
is purged from the system. Repeat the previous
steps if necessary.
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