Section 11: Assembly; Assembly Of Symmetric Yoke Actuators - Emerson Biffi Morin Series Installation, Operation And Maintenance Manual

Installation, Operation and Maintenance Manual
MAN-03-04-103-0738-EN Rev. 1
Section 11:
11.1

Assembly of Symmetric Yoke Actuators

(Models 003-100)
A.
B.
C.
(Models 135, 270-1150)
A.
B.
C.
(Models 003-1150)
D.
E.
F.
G.
H.
I.
Assembly
Assembly
Insert piston rod bushings (7) and output shaft bushings (5) in housing.
(On models B-006 through 100 lube output shaft bushings O-rings (48) with
"Dow Corning #112" lubricant. Push one O-ring halfway on each bushing and
install bushings in housing.)
Place yoke (2) in position in housing. Lubricate with "WD-40" or similar lubricant
and install output shaft (3). (On models B-006 through 100, lube output shaft
O-rings (42) with "Dow Corning #112" lubricant. Install one O-ring on one end
of output shaft and insert through housing and yoke. Install second O-ring on
opposite end of output shaft and push output shaft back into housing.) Secure
output shaft with retaining rings (8).
Lubricate and press yoke pin (6) into yoke and output shaft assembly from open
side of housing. Be sure pin is pressed flush in yoke to prevent interference with
piston rod (4).
Insert yoke key (6b) into output shaft (3).
Install yoke (2) in housing (1). Slide output shaft (3) through top of housing (1)
into the yoke (2). Install lubricated upper and lower bearings (5a).
Install lower thrust washer (22), thrust plate (13), upper thrust washer (22)
retaining ring (8) and thrust plate seal (12) (if fitted). Install lower bearing
retaining ring (12b).
Lubricate with "WD40" and install piston rod (4) being careful not to scratch
sealing surfaces when sliding through yoke assembly.
Swing yoke clear toward left side of housing as shown in Figure 8.
Sub-assemble thrust pin (9) with one roller bearing (10) and one retaining
ring (11). Pre-lubricate sub-assembly with high temperature grease such as
"Whitmore's Omnitemp II".
Install roller bearing sub-assembly per Figure 8. Rotate piston rod 180° and
assemble second roller bearing and retaining ring. Place ample amount of high
temperature grease on roller bearing and inside wear area of yoke.
Engage roller bearing in yoke assembly as shown in Figure 6, 7, and 8.
Install plug (12) in back of housing if applicable. Use "Loctite 222 Thread Locker".

Section 11: Assembly

May 2020
21