Graco 1590 SA, Instructions-Parts List Manual

Page: 24 / 40

Service
24 310622L
.
8. If you removed the diaphragm shaft bearings (117)
reach into the center housing (101) with an o-ring
pick and hook the u-cups (110), then pull them out
of the housing. Inspect the u-cups. See F
IG
. 22.
Replace parts as needed.
Reassembly
1. Install the shaft u-cups (110) so the lips face out of
the housing.
2. Insert new bearings (112, 113, and 117) into the
center housing (101), 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 (119) so the pilot pin
(114) protruding from the center housing (101) fits
through the proper hole in the gasket
.
5. Align the air cover (120) so the pilot pin (114) fits in
the middle hole (M) of the three small holes near the
center of the cover.
6. Apply medium-strength (blue) Loctite
®
or equivalent
to the threads of the screws (122). Install the screws
(122), handtight. Using a 10 mm socket wrench,
torque the screws oppositely and evenly to 130-150
in-lb (15-17 N
•
m). Install the diaphragm assemblies
and fluid covers as explained on page 21.
7. Reassemble the ball check valves and manifolds as
explained on page 19.
F
IG
. 22
Adhesive must be applied to the outside surface of
the bearing (112) and the inside surface of bore (Z)
prior to assembly.
F
IG
. 23
110*
101
112
113
117
TI4731a
110*
Z
112
113
117
TI4731a
101
F
IG
. 24
F
IG
. 25
F
IG
. 26
114 119
TI4730a
M 114
TI4790a
120
122
TI4790a