Assembly Of Canted Yoke Actuators - Emerson Biffi Morin Series Installation, Operation And Maintenance Manual

Installation, Operation and Maintenance Manual
MAN-03-04-103-0738-EN Rev. 1
11.3

Assembly of Canted Yoke Actuators

Canted yoke actuators are assembled the same way as the symmetric yoke actuators
except for the following additional instructions for specific models.
Canted yoke actuators have a non-symmetrical piston rod as well as a non-symmetrical
yoke. It is important to orient the piston rod with the longer dimension in relation to
the yoke as shown in Figure 8C. Note that the finished housing assembly is used for
both fail open and fail closed actuators.
(Models 135-1150)
A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
(Models 1485-7114)
Assembly for these canted yoke actuator models is identical to the symmetric yoke models.
However, the yoke (2) must be oriented as shown in Figure 8B. The left and right piston
rods are different lengths. Refer to Figure 8C to assure the correct orientation.
Assembly
Insert the yoke (2) into the housing (1) and position the yoke in the fully
clockwise position (viewed from the thrust plate [13b] side).
Insert the piston rod (4) correctly oriented with the longer dimension as shown
in Figure 8C.
Install the thrust pin (9) and roller bearings (10) using generous amounts of
Whitmore Omnitemp grease and install both pin retaining rings (11).
Shift the yoke (2) and piston rod (4) so that the thrust pin (11) and roller bearing
(10) assembly can be inserted into the yoke slot. The absence of the piston rod
bushings (7) and output shaft bushings (5) allows just enough room for this process.
Insert the lower output shaft bushing (5) and retaining ring (12b). This bushing
must have a press fit. The integral seal o-ring must be oriented toward the yoke.
Insert the yoke key (6b) into the output shaft (3), then insert the output shaft
into the housing (1) and yoke(2) and lower output shaft bushing (5).
Install the upper output shaft bushing (5) over the output shaft and into the
housing (5). The bearing must have a press fit. The integral seal o-ring must
be oriented toward the yoke.
Install output shaft thrust washer (22), thrust plate gasket(13b) thrust plate
(13b), thrust washer (22) and retaining ring (8).
Install Pointer adaptor (13) using two socket head cap screws.
Install the thrust plate seal (12), pointer (16) and pointer washer (21).
Section 11: Assembly
May 2020
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