Graco SaniForce 1590 3A, Instructions-Parts List Manual

Page: 28 / 50

Service
28 310622ZAL
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. Follow the Pressure Relief Procedure, page 13.
2. Remove the manifolds and disassemble the ball
check valves as explained on page 21.
3. Remove the fluid covers and diaphragm assemblies
as explained on page 23 (standard) or page 26
(3A/Overmolded).
NOTE: If you are removing only the diaphragm shaft
bearing (117), skip step 4.
4. Disassemble the air valve as explained on page 18.
5. Using a 10 mm socket wrench, remove the screws
(122) holding the air covers (120) to the center
housing (101).
6. Remove the air cover gaskets (119). Always replace
the gaskets with new ones.
7. Use a bearing puller to remove the diaphragm shaft
bearings (117), air valve bearings (112) or pilot pin
bearings (113). Do not remove undamaged bear-
ings
.
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
. 24.
Replace parts as needed.
Reassembly
NOTE: Adhesive must be applied to the outside surface
of the bearing (112) and the inside surface of bore (Z)
prior to assembly.
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 18.
F
IG
. 23
TI4733a
119 120 122 101
F
IG
. 24
F
IG
. 25
110*
101
112
113
117
TI4731a
110*
Z
112
113
117
TI4731a
101