Graco 239-327 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. Remove the pump from its mounting. Note the relative position of the fluid outlet (S) to the air inlet (T). See Fig. 3.

3.Unscrew the tie rod locknuts (4) from the tie rods

(3). Remove the cotter pin (5). Carefully pull the displacement pump (2) off the air motor (1). Unscrew the displacement rod (U) from the air motor (1). Inspect the o-ring (6).

4.Refer to manual 306±981 for displacement pump service. To service the air motor, refer to manual 307±043.

Reconnecting the Displacement Pump

1.Lubricate the o-ring (6) and check that it is in place on the displacement rod (U).

2.Orient the fluid outlet (S) to the air inlet (T) as noted in step 2 under Disconnecting the Displacement Pump. Position the displacement pump (2) on the tie rods (3). See Fig. 3.

3.Screw the displacement rod (U) into the shaft of the air motor (1) until the pin holes are aligned. Install the cotter pin (5). Screw the locknuts (4) onto the tie rods (3) loosely.

4.Mount the pump and reconnect all hoses. Reconnect the ground wire if it was disconnected during repair. Tighten the packing nut (V). Fill the wet-cup with Graco Throat Seal Liquid or compatible solvent.

5.Tighten the tie rod locknuts (4) evenly, and torque to 20 to 27 NSm (15 to 20 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

1 ￿

T

1	6	3
	U
	V
		5
	S	4
		2

Lubricate.

Torque to 20 to 27 NSm (15 to 20 ft-lb).

￿

07197

Fig. 3

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