Emerson Process Management BETTIS G01 - Manual (Page 12)

Bettis P/N 124840E
Revision “B”
Page 8 of 46
2.2.8.1.2 Remove o-ring seals (4-80) from the inboard end of tie bars (3-20).
2.2.8.2.3 Remove tie bars (3-20) by pulling the tie bars out and through piston
(3-30).
NOTE: G4 models have flats on outboard end of tie bars (3-20) for wrench placement.
NOTE: G5 through G13 models have a female square on the out board end of tie bars
(3-20) for wrench placement.
2.2.8.2 Remove G4 through G13 tie bars (3-20) as follows: Unscrew and remove tie bars
(3-20) from inner end cap (3-10) and piston (3-30).
2.2.9 Remove piston as follows: (On early G2 and G3 models equipped with outboard and
inboard tie bar nuts skip this step and go to step 2.2.11).
2.2.9.1 Refer to assembly drawing page 2 of 2 Detail "D". Remove two split ring halves
(3-50) and one retainer ring (3-60) from outboard side of piston (3-30).
NOTE: Piston (3-30) acts as the retainer for inboard split ring halves (3-50). When removing
the piston be careful to not lose inboard split ring halves (3-50).
2.2.9.2 Remove piston (3-30) and two split ring halves (3-50) from piston rod (3-40).
NOTE: Steps 2.2.10 is used only on early G2 and G3 models equipped with outboard and inboard
tie bar nuts.
2.2.10 Remove early model G2 and G3 pistons as follows:
2.2.10.1 Refer to assembly drawing page 2 of 2 Detail "D". Remove two split ring halves
(3-50) and one retainer ring (3-60) from inboard side of piston (3-30).
NOTE: Piston (3-30) acts as the retainer for outboard split ring halves (3-50).
2.2.10.2 Slide piston (3-30) toward the inner end cap (3-10) until the out board split ring
halves is exposed enough for removal. Remove outboard split ring halves from
piston rod (3-40).
2.2.10.3 Remove piston (3-30) and two split ring halves (3-50) from piston rod (3-40).
2.2.11 Remove o-ring seal (4-70) from piston rod (3-40).
2.2.12 Remove hex cap screws (3-100) with lockwashers (3-110) from housing (1-10).
2.2.13 Remove inner end cap (3-10) off of piston rod (3-40).
NOTE: On early model G2 and G3 actuators remove two hex nuts (3-90) from housing (1-10).
These two nuts will be loose after tie bars (3-20) are removed in step 2.2.8.1 and will be
located in the area where the piston rod passes through the housing (1-10).
NOTE: The piston rod (3-40) removal as outlined in step 2.2.14 is only required when the piston
rod is being replaced or when the Drive Module is to be disassembled.