18
308368
Service
Bearing and Air Gasket Removal
Tools Required
D
Torque wrench
D
10 mm socket wrench
D
Bearing puller
D
O-ring pick
D
Press, or block and mallet
Disassembly
NOTE:
Do not remove undamaged bearings.
1.
Follow the
Pressure Relief Procedure Warning
on page 9.
2.
Remove the manifolds and disassemble the ball
check valves as explained on page 14.
3.
Remove the fluid covers and diaphragm assem-
blies as explained on page 15.
NOTE:
If you are removing only the diaphragm shaft
bearing (19), skip step 4.
4.
Disassemble the air valve as explained on
page 12.
5.
Using a 10 mm socket wrench, remove the screws
(25) holding the air covers (23) to the center
housing (1). See Fig. 13.
6.
Remove the air cover gaskets (22). Always replace
the gaskets with new ones.
7.
Use a bearing puller to remove the diaphragm
shaft bearings (19), air valve bearings (12) or pilot
pin bearings (15). Do not remove undamaged
bearings.
8.
If you removed the diaphragm shaft bearings (19),
reach into the center housing (1) with an
o-ring pick and hook the u-cup packings (402),
then pull them out of the housing. Inspect the
packings. See Fig. 12.
Reassembly
1.
If removed, install the shaft u-cup packings (402*)
so the lips face
out
of the housing (1).
2.
The bearings (19, 12, and 15) are tapered and can
only be installed one way. Insert the bearings into
the center housing (1),
tapered end first
. Using a
press or a block and rubber mallet, press-fit the
bearing so it is flush with the surface of the center
housing.
3.
Reassemble the air valve as explained on
page 13.
4.
Align the new air cover gasket (22) so the pilot pin
(16) protruding from the center housing (1) fits
through the proper hole (H) in the gasket.
5.
Align the air cover (23) so the pilot pin (16) fits in
the middle hole (M) of the three small holes near
the center of the cover. Install the screws (25),
handtight. See Fig. 13. Using a 10 mm socket
wrench, torque the screws oppositely and evenly
to 120 to 150 in-lb (14 to 17 N.m).
6.
Install the diaphragm assemblies and fluid covers
as explained on page 15.
7.
Reassemble the ball check valves and manifolds
as explained on page 14.
