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Service
Disconnecting the Displacement Pump
1. Flush the pump if possible. Stop the pump at the
bottom of its stroke. Follow the Pressure Relief
Procedure on page 8.
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 (102) from the tie
rods (103). Remove the cotter pin (111). Unscrew
the displacement rod (13) from the air motor (108).
Carefully pull the displacement pump (101) off the
air motor (108). Inspect the o-ring (110). See Fig 4.
4. Refer to page 13 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 (110) and check that it is in
place on the displacement rod (13). 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 (103). See Fig 4.
2. Screw the locknuts (102) onto the tie rods (103)
loosely. Screw the displacement rod (13) into the
shaft of the air motor (108) until the pin holes in
the rod and shaft align. Install the cotter pin (111).
3. Apply thread sealant to the pump fluid outlet (R)
and the threads of the fluid hose. Mount the pump
and reconnect all hoses. Reconnect the ground
wire if it was disconnected during repair. T ighten
the packing nut/wet-cup (2) 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 (102) evenly, and
torque as shown in Fig 4.
5. Start the pump and run i t at about 40 psi (0.3 MPa,
2.8 bar) air pressure, to check that it is operating
properly.
6. Check for fluid leakage at the packing nut/wet-cup
(2). Follow the Pressure Relief Procedure on
page 8 before tightening the packing nut/wet-cup.
Fig. 4
103
110
Model 224342 Shown
0194
108
111
101
102
13
2
R
S
1
3
2
1
3
2
2
Lubricate.
Model 224342: Torque to 20--30 ft-lb (27--41 NSm).
Models 224343, 902147, 247147: Torque to 10--15 ft-lb
(14--20 NSm).
Apply sealant, as required.