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312585E 13
Repair
Disconnect the Displacement
Pump
See the Parts drawings on pages 14-17.
1. Flush the pump, if possible. Stop the pump at the
bottom of its stroke. Relieve the pressure, page 9.
2. Disconnect the air, fluid, and suction hoses.
3. Unscrew the coupling nut (14) from the connecting
rod adapter (11). Remove the coupling collars (13);
do not lose or drop them.
4. Hold the tie rod flats with a wrench to keep the rods
(9) from turning. Unscrew the nuts (12). Remove the
displacement pump (10).
5. To service the displacement pump, refer to manual
311825, 311827, or 312745, supplied. To service
the air motor, refer to manual 311238, supplied.
Reconnect the Displacement
Pump
See the Parts drawings on pages 14-17.
1. Screw the connecting rod adapter (11) to the air
motor shaft.
2. Screw the tie rods (9) into the air motor (6). Using a
wrench on the tie rod flats, torque to 50-60 ft-lb
(68-81 N•m).
3. Make sure the coupling nut (14) and coupling collars
(13) are in place on the displacement rod.
4. Use at least two people to hold the displacement
pump while another reconnects it to the motor (see
the WARNING at left). Orient the pump's fluid outlet
to the air inlet as noted under Disconnect the Dis-
placement Pump. Place the displacement pump
(10) on the tie rods (9).
5. Screw the nuts (12) onto the tie rods (9) and torque
to 50-60 ft-lb (68-81 N•m).
6. Screw the coupling nut (14) onto the connecting rod
adapter (11) loosely. Hold the connecting rod
adapter flats with a wrench to keep it from turning.
Use an adjustable wrench to tighten the coupling
nut. Torque to 90-100 ft-lb (121-135 N•m).
7. Reconnect all hoses. Reconnect the ground wire if it
was disconnected. Fill the wet-cup 1/3 full of Graco
Throat Seal Liquid or compatible solvent.
8. Turn on the air supply. Run the pump slowly to
ensure that it operates properly.
Do not lift the pump by the lift ring when the total weight
exceeds 250 kg (550 lb).
Use at least two people when lifting, moving, or discon-
necting the pump. If disconnecting the displacement
pump, be sure to securely brace the pump, or have two
people hold it while another disconnects it.
Before disconnecting the displacement pump (10)
from the motor (6), be sure to note the relative posi-
tion of the pump’s fluid outlet to the air inlet of the
motor. If the motor does not require servicing, leave
it attached to its mounting.