VERDER 810.0780, Instructions-Parts List Manual

Page: 21 / 28

819.0254 21
Service
Bearing and Air Gasket Removal
Tools Required
• Torque wrench
• 10 mm socket wrench
• Bearing puller
• O-ring pick
• Press, or block and mallet
Disassembly
NOTE: Do not remove undamaged bearings.
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 pages
18 to 19
.
NOTE: If you are removing only the diaphragm shaft
bearing (23), skip step 4.
4. Disassemble the air valve as explained on page 15.
5. Using a 10 mm socket wrench, remove the screws (6)
holding the air covers (4) to the center housing (5).
See Fig. 13.
6. Remove the air cover gaskets (32). Always replace
the gaskets with new ones.
7. Use a bearing puller to remove the diaphragm shaft
bearings (23), air valve bearings (31) or pilot pin
bearings (28). Do not remove undamaged bearings.
8. If you removed the diaphragm shaft bearings (23),
reach into the center housing (5) with an o-ring pick
and hook the u-cup packings (22), then pull them out
of the housing. Inspect the packings. See Fig. 12.
Reassembly
1. If removed, install the shaft u-cup packings (22*) so
the lips face out of the housing (5).
2. The bearings (23, 28, and 31) are tapered and can
only be installed one way. Insert the bearings into the
center housing (5), 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
16
.
4. Align the new air cover gasket (32) so the pilot pin (26)
protruding from the center housing (5) fits through the
proper hole (H) in the gasket.
5. Align the air cover (4) so the pilot pin (26) fits in the
middle hole (M) of the three small holes near the
center of the cover. Apply medium-strength (blue)
Loctite or equivalent to the threads of the screws, and
install the screws (6), hand-tighten. 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). See Torque Sequence on page 25.
6. Install the diaphragm assemblies and fluid covers as
explained on pages
18 to 19
.
7. Reassemble the ball check valves and manifolds as
explained on page
17
.
WARNING
To reduce the risk of serious injury whenever you are
instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 11.