20
819.4334
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 9.
1.
Relieve the pressure.
2.
Remove the manifolds and disassemble the ball check
valves as explained on page 16.
3.
Remove the fluid covers and diaphragm assemblies as
explained on page 17.
NOTE: If you are removing only the diaphragm shaft bear-
ing (19), skip step 4.
4.
Disassemble the air valve as explained on page 14.
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 bear-
ings (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 hous-
ing. 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 (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. See
Fig. 13. Using a 10 mm socket wrench, torque the
screws oppositely and evenly to 15–17 N
S
m.
6.
Install the diaphragm assemblies and fluid covers as
explained on page 17.
7.
Reassemble the ball check valves and manifolds as ex-
plained on page 16.
Summary of Contents for 810.0092
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Page 31: ...819 4334 31 Notes ...
