Emerson Bettis G Series - Page 26

December 2020
Installation, Operation and Maintenance Manual
VA-DC-000-1878 Rev. 0
22
Section 3: Actuator Reassembly
Actuator Reassembly
3.3.2 Torque tighten piston rod (3 - 40) to the lubricated torque as listed in Table 3.
Table 3. Piston Rod Torque Information
Housing
Model
Torque (±5%)
Housing
Model
Torque (±5%)
lb-ft Nm lb-ft Nm
G01 90 122 G5 240 325
G2 90 122 G7 240 325
G3 90 122 G8 240 325
G4 240 325 G10 240 325
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CAUTION
Polypak seal facing piston side. Install the Polypak seal with energizer ring facing piston side
of inner end cap (3 - 10).
3.3.3 Install one O-ring seal (4 - 90) into seal groove located on the inboard face of inner
end cap (3 - 10).
3.3.4 Install inner end cap (3 - 10) on to housing (1 - 10).
NOTE:
The pressure inlet port should be positioned in the same position as recorded in
Section 2.2, step 2.2.1.
3.3.5 Place lock washers (3 - 110) onto hex cap screws (3 - 100).
3.3.6 Install hex cap screws (3 - 100), with lock washers, through housing (1 - 10) and
into inner end cap (3 - 10).
3.3.7 Refer to assembly drawing page 2 of 2 Detail "D". Install one O-ring seal (4 - 70)
into the seal groove in piston rod (3 - 40).
3.3.8 Apply lubricant to two sets of rod T-seal components (4 - 50).
NOTE:
The T-seal is composed of one rubber seal and two split skive-cut back-up rings.
3.3.8.1 Install two sets of rod T-seals (4-50) into the internal diameter seal
grooves of piston (3-30).
3.3.8.2 Install a back-up ring on each side of the T-seal.
3.3.8.3 When installing the back-up rings, do not align the skive-cuts.
3.3.8.4 If the back-up rings are too long and the rings overlap beyond the
skive-cuts, then the rings must be trimmed with a razor-sharp instrument.