Operation and Maintenance Manual
GVO-CLP-SR.IOM.1003 Rev. 0
March 2016
5
Section 4: Seal Replacement
Seal Replacement
4�2
Fail-Open Actuators
1.
Remove the protective cover located on the canister top end.
2.
Unscrew the nut attaching the shaft to the top spring guiding piston.
3.
Unscrew the mounting bolts attaching the canister to the cylinder. This
operation can be done in all safety, without any special precaution. The spring is
contained in a factory sealed canister.
4.
Remove the canister from the cylinder.
5.
Unscrew the tie rod nuts and remove the tie rods.
6.
Remove the cylinder head (rod end cap).
7.
Pull the piston and piston rod assembly from barrel. Take care not to damage
the rod and the barrel.
Do not disassemble the rod from the piston
.
8.
Unscrew the gland bushing from rod end cap.
9.
Remove seals from piston and gland bushing, noting orientation of seal edges.
The U-cups lips must face the pressure direction. Remove barrel O-rings from
end caps grooves.
10.
Verify barrel bore, gland bushing and rod surface for scratches or scoring,
damage or excessive wear.
11.
Replace piston rod assembly and/or gland bushing if damaged. Contact factory
for replacement parts.