SECTION 35 - HYDRAULIC SYSTEMS - CHAPTER 1
35-5
BLEEDING AIR FROM THE LIFT
CYLINDERS
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 hold the
tractor valve in the lower position for 10 to 15 seconds
or by raising the mower-conditioner and hold the
tractor valve for 10 to 15 seconds. If the cylinders do
not extend far enough to release the transport stops,
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, 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
transport stop on the master cylinder side does not
release, excessive oil may be in the slave cylinder
circuit. Bleed this oil until both stop blocks are
engaged on their respective transport stops.
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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