Manual

21
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.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 11.
1. Relieve the pressure.
2. Remove the manifolds and disassemble the ball check
valves as explained on page 17.
3. Remove the fluid covers and diaphragm assemblies as
explained on page 18.
NOTE: If you are removing only the diaphragm shaft
bearing (19), skip step 4.
4. Disassemble the air valve as explained on page 15.
5. Using a 10 mm socket wrench, remove the screws (25)
holding the air covers (23) to the center housing (1).
See Fig. 14.
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. 13.
Reassembly
1. If removed, install the shaft u-cup packings (402*) so
the lips face out of the housing (1).
2. The bearings (12, 15, and 19) 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 15.
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.
Apply medium-strength (blue) LoctiteR or equivalent
to the threads of the screws (25). See Fig. 14. Using a
10 mm socket wrench, torque the screws oppositely
and evenly to 130–150 in-lb (15–17 N.m).
6. Install the diaphragm assemblies and fluid covers as
explained on page 18.
7. Reassemble the ball check valves and manifolds as
explained on page 17.