19
REPAIRS AT THE UNIT
ProSpray 20
11.3
PACKINGS
1.
Remove inlet valve housing in accordance with the steps
in Chapter 11.2.
2.
It is not necessary to remove the outlet valve.
3.
Unscrew both cylinder head screws (Fig. 12, Item 1) from
the pump manifold (2) with a 3/8 inch hexagon socket
head wrench.
4.
Slide the pump manifold (2) and piston (3) forward until
the piston is out of the T-slot (10) on the slider assembly
(5).
5.
Push piston (3) downward out of the pump manifold (2).
6.
Unscrew retainer nut (6) from the pump manifold (2) and
remove piston guide (7).
7.
Remove upper packing (8) and lower packing (9) from the
pump manifold (2).
5
6
7
8
2
1
9
3
10
8.
Clean pump manifold (2).
9.
Lubricate upper packing (8) and lower packing (9) with
machine grease.
10.
Insert upper packing (Fig. 13) with O-ring (1) and
protruding lip (2) downward.
1
2
11.
Insert lower packing (Fig. 14) with the beveled edge (1)
facing upward.
1
12.
Insert piston guide (Fig. 12, Item 7) into the retainer nut
(6). Screw retainer nut (6) into the pump manifold (2) and
tighten by hand.
13.
Push installation tool (included with the replacement
packings) for the piston (3) from above onto the piston.
14.
Lubricate installation tool and piston (3) with machine
grease.
15.
Guide piston (3) through the lower packings (9) into the
pump manifold (2) from below. Using a rubber mallet,
lightly tap the piston (3) from below until it can be seen
above the pump manifold.
16.
Remove installation tool from piston (3).
17.
Carefully tighten retainer nut (6) with adjusting wrench.
18.
Slide the top of the piston (3) into the T-slot (10) on the
slider assembly (4).
19.
Position the pump manifold (2) underneath the gear unit
housing and push up until it rests against the gear unit
housing.
20.
Attach pump manifold (2) to the gear unit housing. Ensure
that the pressure sensor does not damage the pressure
sensor seal (10).
21.
Screw pump manifold (2) tightly to gear unit housing.
22.
Lubricate O-ring (Fig. 10, Item 6) between pump manifold
(2) and inlet valve housing with machine grease. Screw
inlet valve housing to the pump manifold.
23.
Push connection bend of suction hose into the inlet valve
housing (Fig. 10, Item 1) and secure with retaining clip.
Screw on return hose and clamp to suction hose.
24.
Install front cover.
