Section 10: Disassembly; Disassembly Of Symmetric Yoke Actuators - Emerson Biffi Morin Series Installation, Operation And Maintenance Manual

Section 10: Disassembly

May 2020
Section 10:
10.1

Disassembly of Symmetric Yoke Actuators

A.
B.
C.
D.
(Models 003-100)
E.
F.
G.
H.
I.
J.
K.
L.
(Models 135, 270-1150)
E.
F.
G.
H.
I.
J.
K.
L.
M.
N.
18
Disassembly
Remove endcap(s) (27); tie rods (41) and cylinder (24). Remove rod cover (28)
if applicable.
Remove piston bolts (33) and pistons (25) and springs if applicable (55 and 56).
Remove adaptor (26) and piston rod seals (29).
Note: S-003, B-006 and B-015 have one piece cast housing/adaptor.
Remove housing cover (18), pointer (16) and position indicator
(where applicable) (13).
Disengage yoke (2) from roller bearing assembly by pulling piston rod to extreme
right, as in Figure 6, and swing yoke mechanism clear of roller bearing as in
Figure 7.
Rotate piston rod 90° to allow access to retaining ring (11) as shown in Figure 8.
Remove retaining ring and bearing (10). Then rotate piston rod (4) 180° and
remove the bearing and thrust pin assembly.
Remove piston rod (4) and piston rod bushings (7).
Remove plug (12) from back of housing.
Using a punch or suitable dowel pin, insert through clearance hole and press
yoke pin (6) out.
Remove retaining ring (8) from output shaft. Remove output shaft and yoke.
Remove bushings (5) from housing.
Disengage yoke (2) from roller bearing assembly by pulling piston rod (4) to
extreme right, as in Figure 6, and swing yoke (2) clear of roller bearing (10)
assembly. See Figure 7.
Rotate piston rod (4) 90° to allow access to retaining ring (11) as shown in
Figure 8.
Remove the thrust pin retaining rings (11) and withdraw the roller bearings (10),
and thrust pin (9).
Remove piston rod (4) and piston rod bushings (7).
Remove retaining rings (8) and (12b) on both ends of output shaft.
Remove thrust plate (13b) and thrust washers (22) from the output shaft (3).
Position the yoke (2) in the fully clockwise position (viewed from the thrust
plate [13b] side).
Using a soft hammer, drive output shaft (3) out through top of housing (1).
Withdraw yoke (2) from housing (1).
Remove the output shaft bushings (5) from the housing (1).
Installation, Operation and Maintenance Manual
MAN-03-04-103-0738-EN Rev. 1
Disassembly