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307619 11
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 8.
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 fluid outlet (R) to the air inlet (S). See Fig. 3.
3. Unscrew the tie rod locknuts (4) from the tie rods
(10). Remove the cotter pin (3). Carefully pull the
displacement pump (13) off the air motor (12).
Unscrew the displacement rod (103) from the air
motor (12) or adapter (5, President Pump only).
Inspect the o-ring (6).
4. Refer to page 12 for displacement pump service.
To service the air motor, refer to the separate air
motor manual, which is supplied.
Reconnecting the Displacement Pump
1. Lubricate the o-ring (6) and check that it is in place
on the displacement rod (103).
2. Orient the fluid outlet (R) to the air inlet (S) as
noted in step 2 under Disconnecting the
Displacement Pump. Position the displacement
pump (13) on the tie rods (10). See Fig. 3.
3. Screw the displacement rod (103) into the shaft of
the air motor (12) or the adapter (5, President
Pump only) until the pin holes are aligned. Screw
the locknuts (4) onto the tie rods (10) loosely.
Install the cotter pin (3).
4. Mount the pump and reconnect all hoses.
Reconnect the ground wire if it was disconnected
during repair. Torque the packing nut (104) to 18 to
20 ft-lb (24 to 27 N.m). Fill the wet-cup with Graco
Throat Seal Liquid or compatible solvent.
5. Tighten the tie rod locknuts (4) evenly, and torque
as specified in Fig. 3. Start the pump and run it at
about 40 psi (0.28 MPa, 2.8 bar) air pressure, to
check that it is operating properly.
1
2
Lubricate.
Torque to 10 to15 ft-lb (14 to 20 N.m).
06938
02099
Fig. 3
S
12
6
103
104
R
10
3
4
1
2
13
2
12
10
4
13
103
104
R
3
3 Torque to 20 to 30 ft-lb (27 to 41 N.m).
4 Torque to 18 to 20 ft-lb (24 to 27 N.m).
5
S
3
3
4
4
Monark Models
223596 (shown)
and 237958
President Model
239140 (shown)
6
1