CYLINDERS
Cylinders
352
M8.0-1055-006
01 Rev. 6/08
Mast Cylinder Bleeding
1. Elevate carriage to approximately 1220 mm
(48.0 in).
2. Slowly open each cylinder's bleed screws and
bleed air from cylinders until a solid stream of hy-
draulic fluid flows out of the cylinders.
3. Tighten bleed screw.
Mast Cylinder Flushing
1. After bleeding cylinders, actuate control valve to
raise carriage through free and stage lift and stop
to hold in position.
2. With carriage raised, examine cylinders for any
leaks.
3. Actuate control valve to lower carriage through
stage and free lift to examine operation and stag-
ing.
4. Raise and lower carriage rapidly for a minimum of
10 cycles to flush system.
Never stand or work under a suspended load.
Fully extend the mast with maximum rated load. The
load may not drift down more than 50 mm (2.0 in)
within five minutes.
Occasionally, a slight creep of the fork assembly may
occur due to internal cylinder seal leakage, but it can
also be caused by leakage in the check valves, control
valve, etc. To seat these valves properly when this oc-
curs, raise and lower the forks to flush out any foreign
material from the valve seat.
Crown 2007 PF15682-6 Rev. 6/08
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