Graco GM 3000 Instructions-Parts List Manual page 34

Displacement Pump Repair
Intake valve repair
(See Fig. 24)
1.
Remove the suction tube or hose. See Step
3,
Removing the pump.
2. Unscrew the intake valve (118). Remove the
o-ring (119*), ball guide (120). stop pin (122') and
ball (121') from the valve.
3.
Clean and inspect the parts for wear or damage.
Replace parts as needed. Use a new o-ring
(11 9 ' ) . If no further service is needed, reassemble
the pump.
Disassembling the pump
(See Fig. 26.)
1. Remove the intake valve (118).
2. Loosen the packing nut (102).
3. Use a plastic mallet to tap the.piston rod (107)
down, and then pull the rod out through the bottom
of the cylinder.
4. Remove the packing nut (102) and throat pack-
ings.
5. Loosen the jam nut (117). Remove the cylinder
(115) and the o-ring (116*).
6.
Clamp the flats of the piston rod i . n a smooth jaw
vise. Use an open-end wrench to loosen the nut
(110) and then unscrew the piston valve (108).
7. Remove all parts from the piston valve (108).
Reassembling the pump
26. The lips of the throat V-packings face down. The
NOTE: Alternate plastic and leather packings. See Fig.
tion damages the packings and causes pump leakage.
lips of the piston V-packings face up. Incorrect installa-
sembling the pump.
NOTE: Soak the leather packings in oil before reas-
1. Check the outside of the piston rod (107) and the
inside of the cylinder (115) for wear. Replace worn
parts to ensure
a
good seal with the new packings.
2. Stack these parts onto the piston valve
(108)
one
at a time: the backup.washer (126') and u-cup
(125'), the female gland (114*), alternately three
plastic (112') with two leather packings (Il3*), and
the male gland (111.). See Fig. 26.
i
A
~Thmat packings
Piston packlngs
A
intake valve
A
-a
123
102
Fig.
26
O3148A
34
308-620