Graco 308738C Service, Disconnecting the Displacement Pump, Reconnecting the Displacement Pump

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).

1Lubricate.

2Torque to 27 to 41 NSm (20 to 30 ft-lb).

1
		P
6	9	1
	R

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.

S

27

5

4

8

N

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 NSm (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.

2

07200

Fig. 3

308738 11