Graco 253485 User Manual

308549 17
Service
04899
Fig. 9
17{H 16
11
10{H
12
15
1
2
Insert narrow end first.
Grease.
3
Install with lips facing
narrow end of piston (11).
4
Insert wide end first.
1
2
3
4
2
03271
1
2
8H
9{
3
Rounded side must face down (aluminum
center housing models only).
Tighten screws until
they bottom out on the
housing.
Fig. 10
1
2
Reassembly
1. If you removed the bearings (12, 15), install new
ones as explained on page 23. Reassemble the
fluid section.
2. On aluminum center housing models, install the
valve plate seal (9{) into the groove at the bottom
of the valve cavity. The rounded side of the seal
must face down into the groove. See Fig. 10.
3. Install the valve plate (8H) in the cavity. On alumi-
num center housing models, the plate is reversible,
so either side can face up. Install the three screws
(3), using a Torx (T20) screwdriver or 7 mm
(9/32 in.) socket wrench. Tighten until the screws
bottom out on the housing. See Fig. 10.
4. Install an o-ring (17{H) on each pilot pin (16).
Grease the pins and o-rings. Insert the pins into
the bearings (15), narrow end first. See Fig. 9.
5. Install a u-cup packing (10{H) on each actuator
piston (11), so the lips of the packings face the
narrow end of the pistons. See Fig. 9.
6. Lubricate the u-cup packings (10{H) and actuator
pistons (11). Insert the actuator pistons in the
bearings (12), wide end first. Leave the narrow
end of the pistons exposed. See Fig. 9.
7. Grease the lower face of the pilot block (18{) and
install so its tabs snap into the grooves on the
ends of the pilot pins (16). See Fig. 8.
8. Grease the o-ring (6{H) and install it in the valve
block (7{H). Push the block onto the valve carriage
(5). Grease the lower face of the valve block. See
Fig. 8.
9. Install the valve carriage (5) so its tabs slip into the
grooves on the narrow end of the actuator pistons
(11). See Fig. 8.
10. Align the valve gasket (4{H) and cover (2) with the
six holes in the center housing (1). Secure with six
screws (3), using a Torx (T20) screwdriver or 7
mm (9/32 in.) socket wrench. Torque to 50–60 in-lb
(5.6–6.8 NSm). See Fig. 7.

Graco 253485 Specifications

General

Brand	Graco
Model	253485
Category	Water Pump
Language	English