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
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
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
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.
Monark Models 223596 (shown) and 237958
1 6
103
4 104
R
1Lubricate.
2Torque to 10 to15
3Torque to 20 to 30
4Torque to 18 to 20
S
President Model 239140 (shown)
12
5 
3
102
103
3
4 104 
42
R
13
S
12
103
61
43
13
02099 | 06938 |
Fig. 3
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