Emerson Bettis GTD Series, Service Instructions Manual

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Service Instructions
133893 Rev. C
January 2013
18
Section 3: Actuator Reassembly
Actuator Reassembly
Table 4� Tie Bar Nuts (7-90) Torque Table
Housing
Model
TORQUE (±5%)
Housing
Model
TORQUE (±5%)
FT-lb N-m FT-lb N-m
GTD01 70 95 GTD7 466 632
GTD2 70 95 GTD8 680 922
GTD3 125 169 GTD10 875 1186
GTD4 190 258 GTD13 1367 1854
GTD5 330 447
3.4.25 Lubricate stop screw (7-180) and install into the outer end cap (7-80).
NOTE:
The stop screw is installed from the outboard side of the outer end cap (7-80).
3.4.26 Install o-ring seal (8-100) onto the out board side of the stop screw (7-180).
3.4.27 Install jam nut (7-190) onto the out board side of the stop screw (7-180).
3.4.28 Adjust stop screw (7-180) back to settings recorded earlier in Section 2 at step
2.3.2.
3.4.29 Tighten jam nut (7-190) securely.
3.4.30 If removed apply thread sealant to two pipe plugs (7-210) and install into the ports
of outer end cap (7-10) and inner end cap (7-80).
3.4.31 For installation of the GTO oil cylinder onto Drive Module (housing) refer to
Section 4 step 4.2 for GTO oil cylinder installation instructions.
3�5 Actuator Testing
3.5.1 Leakage Test - All sources of leakage to atmosphere and across pistons are to be
checked, using pneumatic pressure.
3.5.2 Cycle the actuator five time at 10 % percent of the operating pressure, as listed
on the actuator name tag under max. pressure or use a minimum 80 to 100 psig
pressure.
NOTE:
If excessive leakage across the piston remains, the actuator must be disassembled and the
cause of leakage must be determined and corrected.
3.5.3 Apply operating pressure as listed in step 3.5.2 to one side of the piston and allow
the actuator to stabilize.
3.5.4 Repeat the above procedure for the opposite side of the piston.
3.5.5 If an actuator was disassembled and repaired, the above leakage test must be
performed again.