HYDRAULIC CYLINDER BLEED PROCEDURE
IMPORTANT: Trapped air suddenly compressed in a
cylinder is heated and ignites the oil
used for assembly causing cap seal and
ring damage. Start with cylinder rod
retracted and the rod end filled with
clean oil. Connect the cylinder head end
and lines. Operate function to slowly
extend rod. Procedure will eliminate
most of the air and reduce the
possibility of damage.
NOTE: Bleed air at initial start-up, whenever major repairs
or maintenance (oil change) is done on hydraulic
system, or when machine has been in storage for
a period of time.
1. Run engine at slow idle.
2. Slowly operate function to move cylinder to the most
horizontal position possible.
3. Slowly extend and retract cylinder several times to
approximately 100 mm (4 in.) from end of stroke.
4. Operate cylinder several times to full stroke.