Repair Notes; Displacement Pump Service - Graco 224-522 Instructions Manual

SERVICE
REPAIR NOTES
1.
To
service the air motor, disconnect it from the dis-
placement pump as explained below, and refer to the
air motor manual 307-456.
2. Packing Repair Kit 222-344
is
available. Parts
in-
cluded in the kit are designated with an asterisk, for
example, (103*). For best results,
use
all of the parts
packings before installing.
in the kit, even
if
the old parts look good. Lubricate the
DISPLACEMENT PUMP SERVICE
(See
Figs.
5 & 6 )
1. Flush
the
pump and stop it at the bottom of its stroke.
2. Before repairing the pump, follow the
Pressure
Re-
lief
Procedure
Warnlng on page
9.
3. Disconnect the air and fluid hoses. Loosen the bung
adapter screw (1 6) and lift the pump off its mounting.
4. Remove the three locknuts (4) from the tie rods (3).
coupling (1 15) in the air motor (1). Unscrew the cou-
Remove the spring clip
(6)
and pin (5) holding the
pling from the air motor. Puli the air motor (1) off the
displacement pump (2). See Fig. 5.
5. Unscrew the tie rods (3) from the displacement pump
(2).
6. Hold
the pump upside down and unscrew the intake
valve (102) from the pump cylinder (101). See Fig. 6.
Remove the ball guide (105), ball (104), and ball stop
pin
(1 06) from the cylinder, being careful that they do
not fall out. Remove the gasket (103). Clean ail parts
and inspect for wear or damage. Check the ball and
seat
for
nicks.
7. Loosen, but do not remove the packing nut (1 14). Un-
(107) and push the rod down
until it clears the bottom
screw the coupling (1 15) from the displacement rod
ofthecylinder(lOl).Pullthedisplacementrodoutthe
bottom of the cylinder.
8.
Unscrewthe piston stud (108) from the displacement
rod (107). Remove the piston nut (1 11) and piston
packing(121).Drivethepin(109)outofthepistonand
wear or damage.
remove the ball (1 10). Clean and inspect all parts for
9. Unscrew the cylinder (101) from the outlet housing
(1 13). Inspect the inner surface of the cylinder and the
outer surface of the displacement rod (107) for scor-
ing which can damage the throat packings. Remove
and inspect the O-ring (1 12).
10. Unscrew the packing nut (1 14) and remove the throat
packings from the outlet tiousing (1 13). Clean and in-
spect all parts for wear or damage.