Graco 1590 SA, Instructions-Parts List Manual

Page: 17 / 40

Service
310622L 17
5. Inspect the valve plate (108) in place. If damaged,
use a Torx (T20) screwdriver or 7 mm (9/32 in.)
socket wrench to remove the three screws (103).
Remove the valve plate (108). See F
IG
. 9.
6. Inspect the bearings (112, 117) in place. See Parts
on page 31. The bearings are tapered and, if dam-
aged, must be removed from the outside. This
requires disassembly of the fluid section. See page
23.
7. Clean all parts and inspect for wear or damage.
Replace as needed. Reassemble, page 17.
Reassembly
1. If you replaced the bearings (112, 117), reinstall as
explained on page 24. Reassemble the fluid section.
2. Install the valve plate (108) in the cavity, seal down.
Install the three screws (103), using a Torx (T20)
screwdriver or 7 mm (9/32 in.) socket wrench.
Tighten until the screws bottom out on the housing.
See F
IG
. 9.
3. Install an o-ring (115) on each pilot pin (114).
Grease the pins and o-rings. Insert the pins into the
bearings, narrow end first. See F
IG
. 10.
4. Install u-cups (110) on each actuator piston (111),
so the lips of the packings face the narrow end of
the pistons. See F
IG
. 10.
5. Lubricate the u-cups (110) and actuator pistons
(111). Insert the actuator pistons in the bearings,
wide end first. Leave the narrow end of the pistons
exposed. See F
IG
. 10.
6. Grease the lower face of the pilot block (116) and
install so its tabs snap into the grooves on the ends
of the pilot pins (114). See F
IG
. 11.
7. Grease the lower face of the valve carriage (105).
See F
IG
. 11.
F
IG
. 9
103
108
◆
TI4618c
F
IG
. 10
TI4617b
115
◆
114
110
◆
111