Emerson BETTIS G10 Series Service Instructions Manual page 18

Section 3: Actuator Reassembly
October 2015
3�2�13 Tighten extension retainer nut assembly (9-60) until extension rod assembly (9-
NOTE:
Consult Houston, Texas Bettis Service Coordinator for "yoke bearing, yoke pin bearing or
yoke/guide block bushing installation information".
3�2�14 If the two yoke bearings (2-40) are being replaced, install new bearing into housing
NOTE:
The yoke bearing (2-40) must be press fitted into housing (1-10) and housing cover (1-20).
Install the yoke bearings with the bearing seam located 45 ±5 degrees from the yoke arm
slot when yoke (1-70) is rotated to its full clockwise position.
3�2�15 If the two yoke pin thrust bearings (2-10) are being replaced install new bearing
3�2�16 Lubricate two yoke/guide block bushings (2-30) and install onto top and bottom
NOTE:
The guide block (1-30) should be already preassembled with extension rod assembly and
associated parts assembled in the guide block.
3�2�17 Install guide block (1-30), with yoke/guide block bushings (2-30), between arms of
3�2�18 Install O-ring seal (2-50) into inner diameter O-ring groove in the bottom of
3�2�19 Coat the bearing surfaces of the yoke (1-70) with lubricant and install into
3�2�20 Align hole in guide block (1-30) with the matching holes in the two yoke/guide
NOTE:
The yoke pin can be held in place by installing a screw into the .375 16 UNC tapped hole in
the upper end of yoke pin (1-80).
3�2�21 Install yoke pin (1-80) by inserting into the upper yoke arm, upper yoke/guide
3�2�22 Install guide bar (1-90) into either side of housing (1-10) by inserting through the
14
50) cannot move. Back off the extension retainer nut assembly (9-60) just enough
to allow the extension rod assembly (9-50) to move freely.
cover (1-20) and housing (1-10).
into housing cover (1-20) and housing (1-10).
sides of guide block (1-30).
yoke (1-70).
housing (1-10).
housing (1-10).
block bushings (2-30) and the slots in the arms of yoke (1-70).
block bushing, guide block, lower yoke/guide block bushing and lower yoke arm,
and resting on lower yoke pin thrust bearing (2-10).
housing, through guide block and then insert the guide bar into the other side of
housing (1-10).
Service Instructions
124842E Rev. C
Actuator Reassembly