Service - Graco A Series Instructions-Parts List Manual

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 pump's fluid outlet (R) to the air motor's air
inlet (S).
3. Unscrew the tie rod locknuts (26) from the tie rods
(34). Hold the flats of the displacement rod (19)
with a wrench, then use another wrench to un-
screw the connecting rod nut (22). Carefully pull
the displacement pump (2) off the air motor (1).
See Fig. 4.
4. Refer to page 14 (Model 217529) or page NO TAG
(Model 214930) for displacement pump service. To
service the air motor, refer to the separate air
motor manual 306982, supplied.
Reconnecting the Displacement Pump
1. Orient the pump's fluid outlet (R) to the air motor's
air inlet (S) as was noted in step 2 under Discon-
necting the Displacement Pump. Position the
displacement pump (2) on the tie rods (34).
2. Screw the locknuts (26) onto the tie rods (34)
loosely. Screw the connecting rod nut (22) onto the
displacement rod (19).
3. Tighten the tie rod locknuts (26) evenly, and torque
to 20–30 ft–lb (27–41 NSm).
4. Mount the pump and reconnect all hoses. Recon-
nect the ground wire if it was disconnected during
repair. Tighten the packing nut/wet-cup (4) so it is
just snug – no tighter. Fill the wet-cup 1/2 full with
Graco Throat Seal Liquid or compatible solvent.
5. 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.

Service

1
Lubricate.
Torque to 20–30 ft–lb (27–41 NSm).
2
1
Fig. 4
30
25
19
4
R
1
S
22
34
2
26 2
2
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