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306981 13
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 to the air motor’s air inlet.
3. See Fig. 4. (For Model 221075, refer also to the
Parts Drawing on page 16.) Unscrew the tie rod
locknuts (4) from the tie rods (12). Remove the
cotter pin (3). Unscrew the displacement rod (26)
from the air motor (14) or connecting rod (37, Mod-
el 221075 only). Carefully pull the displacement
pump (15) off the air motor (14). Inspect the o-ring
(7).
4. Refer to page 14 for displacement pump service.
To service the air motor, refer to the separate air
motor manual, supplied.
Reconnecting the Displacement Pump
1. Lubricate the o-ring (7) and place it on the dis-
placement rod (26). Orient the pump’s fluid outlet
to the air motor’s air inlet as was noted in step 2
under Disconnecting the Displacement Pump.
Position the displacement pump (15) on the tie
rods (12). See Fig. 4.
2. Screw the locknuts (4) onto the tie rods (12) loose-
ly. Screw the displacement rod (26) into the shaft
of the air motor (14) or the connecting rod (37,
Model 221075 only) until the pin holes align. Install
the cotter pin (3).
3. Mount the pump and reconnect all hoses.
Reconnect the ground wire if it was disconnected
during repair. Torque the packing nut/wet-cup (36)
to 18–20 ft–lb (24–27 N.m). Fill the wet-cup with
Graco Throat Seal Liquid or compatible solvent.
4. Tighten the tie rod locknuts (4) evenly, and torque
as specified in Fig. 4.
5. Start the pump and run it at about 40 psi (3 bar) air
pressure, to check that it is operating properly.
02503
Fig. 4
1
2
7
3
15
14
26
President Pumps:
Torque to 20–30 ft–lb (27–41 N.m)
Monark Pumps:
Torque to 15–20 ft–lb (20–27 N.m)
Torque to 18–20 ft–lb (24–27 N.m)
36
4
12
2
1
1
3
Lubricate
3
Model 223586 Shown