Service Instructions
074985 Rev. B
October 2014
12
12
Section 10: Pressure Cylinder Reassembly
Pressure Cylinder Reassembly
Low Temperature Actuators:
a.
Coat piston seal grooves with fluid.
b.
Apply fluid to piston T-Seal (6-10). Seal is composed of rubber seal and
two back up rings. The rings serve as anti-extrusion backups.
c.
Install T-Seal (6-10) into piston seal groove - outboard side of piston (2-20).
d.
Install backup ring on each side of T-Seal.
10.
Install piston (2-20) onto piston rod (2-10).
NOTE:
One side of piston (2-20) has a raised boss in the center that is counter bored to accept
the O-ring installed in Section 10, Step 8. The counter bore side of the piston should be
installed against the shoulder of piston rod (2-10) and over O-ring seal (6-50).
11.
Install hex lock nut (2-70) onto piston rod (2-10). Torque the hex lock nut (2-70)
to approximately 146 foot-pounds.
NOTE:
When installing hex lock nut (2-70), the Teflon insert should rest up against piston (2-20).
12.
For actuators equipped with a M3 jackscrew, refer to Section 14 for
reassembling the M3 into cylinder (3-10).
13.
Apply a thin coating of fluid to the bore of the cylinder (3) or cylinder assembly
M3 (3-10).
14.
Install the cylinder (3) or cylinder assembly M3 (3-10) over the piston (2-20).
CAUTION: DO NOT DAMAGE PISTON CUP SEAL LIP
Exercise care to prevent damage to the piston cup seal lip during cylinder installation.
It is necessary to depress the seal lip while working the cylinder over it.
15.
Rotating the cylinder clockwise, screw the cylinder (3) or cylinder assembly
M3 (3-10) into the cylinder adapter and tighten with the chain wrench.
CAUTION: SECURE CHAIN WRENCH PROPERLY
When using the chain wrench on the cylinder, it should be secured as close to the
welded end cap as possible.
16.
Install pipe plugs (2-130) into cylinder adapters (2-30) and cylinders (3) or (3-10).
17.
Close bleed valves (2-120) in cylinders adapters (2-30) and cylinders (3) or (3-10).