308738
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. Unscrew the
bung adapter (4) from the bung hole in the drum
cover and pull the pump out of the drum. Note the
relative position of the fluid outlet (N) to the air inlet
(P). See Fig. 3.
3.
Unscrew the tie rod locknuts (7) from the tie rods
(6). Remove the cotter pin (8). Carefully pull the
displacement pump (2) off the air motor (1).
Unscrew the displacement rod (R) from the air
motor (1). Inspect the o-ring (9).
4.
Refer to manual 307044 for displacement pump
service. To service the air motor, refer to manual
306982.
Reconnecting the Displacement Pump
1.
Lubricate the o-ring (9) and check that it is in place
on the displacement rod (R).
2.
Orient the fluid outlet (N) to the air inlet (P) as
noted in step 2 under
Disconnecting the
Displacement Pump
.
Position the displacement
pump (2) on the tie rods (6). See Fig. 3.
3.
Screw the displacement rod (R) into the shaft of
the air motor (1) until the pin holes are aligned.
Install the cotter pin (8). Screw the locknuts (7)
onto the tie rods (6) loosely.
4.
Mount the pump and reconnect all hoses.
Reconnect the ground wire if it was disconnected
during repair. Tighten the packing nut (S). Fill the
wet-cup with Graco Throat Seal Liquid or
compatible solvent.
5.
Tighten the tie rod locknuts (7) evenly, and torque
to 27 to 41 N
S
m (20 to 30 ft-lb). Start the pump
and run it at about 2.8 bar (0.28 MPa, 40 psi) air
pressure, to check that it is operating properly.
1
2
Lubricate.
Fig. 3
Torque to 27 to 41 N
S
m (20 to 30 ft-lb).
07200
1
2
4
5
6
7
8
9
N
P
R
S
1
2
