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64 Hydraulic Cylinder and Hydraulic Seal Support
Section 4: Maintenance Operating and maintenance instructions
January 2015 3-9008-701 Rev J
3. Disconnect the Nitrogen supply line from the hydraulic cylinder.
4. Drain the hydraulic fluid from the hydraulic cylinder by disconnecting the pressure hose
from the hydraulic pump. If the fluid is caught in a clean container, it may be reused. If
the fluid is not to be reused, disposal should be done in an environmentally safe
manner.
5. Remove the four nuts securing the upstream flange of the hydraulic cylinder.
6. Remove the support bracket holding the upstream end of the hydraulic cylinder.
7. Remove the upstream flange and o-ring from the actuator cylinder.
8. Remove the four hydraulic cylinder tie rods. If the rods cannot be removed by hand,
install two nuts, tighten them together and use a wrench on the inner nut to unscrew
the rod.
9. Remove the hydraulic cylinder tube and o-ring taking care not to damage the actuator
piston or cylinder tube. Oil will drain from the cylinder as it is pulled from its'
downstream flange.
10. Remove the lock nut attaching the actuator piston. An impact wrench is recommended
for this step. However, if one is not available the strap wrench listed in Section 6.1 may
be used to hold the actuator shaft while a wrench is used to remove the actuator piston
nut.
Important:
Do not damage the outer surface of the actuator shaft.
Damaging the actuator shaft may result in seal damage.
11. Remove the actuator piston and cushion. Care should be taken when removing the
piston from the actuator shaft, as there is an o-ring inside the piston. Remove the
actuator piston as if unthreading a nut from a screw.