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Service
Disconnecting the Displacement Pump
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
1. Flush the pump, if possible. Stop the pump at the
bottom of its stroke. Relieve the pressure.
2. Disconnect the air and fluid hoses. Remove the
pump from its mounting. Note the relative position
of the pump’s fluid outlet (R) to the air motor’s air
inlet (S).
3. Unscrew the tie rod locknuts (112) from the tie
rods (102). Remove the cotter pin (109). Unscrew
the displacement rod (1) from the air motor (106).
Carefully pull the displacement pump (101) away
from the air motor (106). Inspect the o-ring (105).
See Fig. 3.
4. Refer to page 15 for displacement pump service.
To service the air motor, refer to the separate air
motor manual (306982 or 307043), supplied.
Reconnecting the Displacement Pump
1. Lubricate the o-ring (105) and check that it is in
place on the displacement rod (1). Orient the
pump’s fluid outlet (R) to the air motor’s air inlet
(S) as was noted in step 2 under Disconnecting
the Displacement Pump. Position the displace-
ment pump (101) on the tie rods (102). Screw the
locknuts (112) onto the tie rods (102) loosely. See
Fig. 3.
2. Screw the displacement rod (1) into the shaft of
the air motor (106) until the pin holes in the rod
and shaft align. Install the cotter pin (109).
3. Mount the pump and reconnect all hoses. Recon-
nect the ground wire if it was disconnected during
repair. Tighten the packing nut/wet-cup (14) so it is
just snug – no tighter. Fill the wet-cup with Graco
Throat Seal Liquid or compatible solvent.
4. Tighten the tie rod locknuts (112) evenly, and
torque as shown in Fig. 3.
5. Start the pump and run it at about 40 psi (280 kPa,
2.8 bar) air pressure, to check that it is operating
properly.
6. Check for fluid leakage at the packing nut/wet-cup
(14). Relieve the pressure before tightening the
packing nut/wet-cup.
105
MODEL
224348
SHOWN
106
109
101
1
14
R
S
34
33
107
112
102
Fig. 3
1
2
Torque to 20–30 ft-lb
(27–41 NSm) on Model 224348
Torque to10–15 ft-lb
(14–20 NSm) on Model 224350
Lubricate
2
1
1
0199B