13
FORM NO. L-20191-F-1202
PARTS REPLACEMENT - PISTON BEARING AND O-RING SEALS
FMCBE 7-28, 8-38, AND 8-42
NOTE: Refer to Figure 14 for steps 1-5.
1.
Remove the four Socket Head Cap Screws (Item 8)
and separate the Air Chamber (Item 14) from the
Housing (Item 7).
2.
Remove the four Socket Head Cap Screws (Item 8)
securing the Male Pilot (Item 27) to the Cylinder
(Item 22).
3.
Remove the Male Pilot (Item 27) and Stub Shaft
(Item 31) from the Cylinder.
4.
Remove the four Socket head Cap Screws (Item
15) securing the Cylinder (Item 22) to the Air
Chamber (Item 14).
5.
Remove the Cylinder from the Air Chamber.
Use caution and
always wear safety
goggles when working
with spring or tension
loaded fasteners or
devices such as
retaining ring.
WARNING
NOTE: Refer to Figure 15 for steps 6-22.
6.
Remove the Retaining Ring (Item 6) from the
Splined Disc (Item 9).
7.
Press the Splined Disc (Item 9) out of the Bearing
(Item 2).
8.
Remove the Piston (Item 17) from the Air Chamber
(Item 14).
9.
Remove the Retaining Ring (Item 3) from the
Piston.
10. Remove the old O-ring Seals from the Piston and
Air Chamber.
11. Press the Bearing (Item 2) out of the Piston.
12. Clean the bearing bore of the Piston with fresh
safety solvent, making sure all old Loctite
®
residue
is removed.
13. Apply an adequate amount of Loctite
®
680 to evenly
coat the outer race of the new Bearing (Item 2).
14. Carefully align the outer race of the new Bearing
(Item 2) with the bore of the Piston.
15. Supporting the Piston (Item 17) and pressing on the
outer race of the new Bearing (Item 2), press the
new Bearing into the Piston.
16. Reinstall the Retaining Ring (Item 3), securing the
Bearing to the Piston.
17. Coat the o-ring contact surfaces of the Air Cham-
ber, Piston, and the O-ring Seals with a thin film of
o-ring lubricant and install the new O-ring Seals.
18. Slide the Piston into the Air Chamber (Item 14).
19. Support the inner race of the Bearing (Item 2) and
press the Splined Disc (Item 9) into the Bearing and
Piston.
20. Reinstall the Retaining Ring (Item 6) that secures
the Splined Disc to the Bearing.
21. Apply a drop of Loctite® 242 to the threads of the
Socket Head Cap Screws (Item 8).
22. Reinstall and tighten the four Socket Head Cap
Screws (Item 8), securing the Air Chamber (Item
14) to the Housing (Item 7) to the recommended
torque (See Table 3).
Figure 14
Figure 14
Figure 14
Figure 14
Figure 14
Figure 15
Figure 15
Figure 15
Figure 15
Figure 15
7
13
24
21
14
14
9
13
15
6
3
2
17
16
E
B
C
M
F
L
E
D
O
M
S
E
U
Q
R
O
T
G
N
I
N
E
T
H
G
I
T
D
E
D
N
E
M
M
O
C
E
R
)
4
1
M
E
T
I
(
S
W
E
R
C
S
P
A
C
D
A
E
H
T
E
K
C
O
S
8
2
-
7
]
b
l
-
t
f
2
.
7
1
[
m
N
3
.
3
2
8
3
-
8
]
b
l
-
t
f
1
.
4
3
[
m
N
2
.
6
4
2
4
-
8
]
b
l
-
t
f
1
.
4
3
[
m
N
2
.
6
4
T
T
T
T
Table 3
able 3
able 3
able 3
able 3
®
DIST. AUTORIZADO
MEX (55) 53 63 23 31
QRO (442) 1 95 72 60
MTY (81) 83 54 10 18
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