Emerson Bettis G2 Series - G2 and G3 Early Model Pneumatic Power Module Reassembly

July 2020
Installation, Operation and Maintenance Manual
VA-DC-000-1803 Rev. 2
24
Section 3: Actuator Reassembly
Actuator Reassembly
3.4 G2 and G3 Early Model Pneumatic Power
Module Reassembly
NOTES:
1. Early G2 and G3 pneumatic power modules where equipped with tie bars that had
nuts on both ends of the tie bars (3 - 20) – double nuts.
2. Refer to Section 2 step 2.1.4 for the correct installation location for piston
rod (3 - 40).
3. THE ACTUATOR MUST BE IN THE APPROPRIATE OVERTRAVEL POSITION.
Conrm over-travel position by observing the guide block (1 - 30) is against the inner
wall of housing (1 - 10).
4. Refer to dwg. VA115680 for details.
3.4.1 Refer to assembly drawing page 2 of 2 Detail "C". Install one rod wiper (4 - 10) into
inner end cap (3 - 10).
3.4.2 Install one rod bushing (4 - 20) into inner end cap (3 - 10).
3.4.3 Coat one Polypak seal (4 - 30) with lubricant and install, lip rst, into inner end
cap (3 - 10).
!
CAUTION
Install Polypak seal correctly. Install the Polypak seal with energizer ring facing outboard
side of inner end cap (3 - 10).
3.3.23 Install tie bar nuts (3 - 90) onto tie bars (3 - 20). Torque tighten tie bar nuts,
alternately in 100 lb-ft / Nm increments, until a nal lubricated torque,
as listed in the following Table, has been achieved.
Table 4. Tie Bar Nuts
Housing
Model
Torque (±5%)
Housing
Model
Torque (±5%)
lb-ft Nm lb-ft Nm
G01 120 163 G5 400 542
G2 120 163 G7 500 678
G3 150 203 G8 500 678
G4 150 203 G10 1,200 1,627
3.3.24 Install lock washers (3 - 140) onto socket cap screws (3 - 130).
3.3.25 Install and tighten socket cap screws (3 - 130), with lock washers (3 - 140), into
outer end cap (3 - 80).
3.3.26 If removed, using pipe dope, install pipe plug (3 - 120) into outer end cap (3 - 80).