Graco 238894, 238892, 238890 important safety instructions Replacing the Cartridge

Service

Replacing the Cartridge

See Fig. 3, and follow the steps below. For parts that are not called out in Fig. 3, see the Parts Drawing on page 14.

CAUTION

Handle the hard carbide parts, which are the ball (16), valve actuator (1), and valve seat (14), carefully to avoid damaging them.

1.Relieve the pressure.

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 7.

2.Remove the cartridge assembly by loosening the valve housing (5) with a 6 mm hex wrench and pulling the cartridge assembly out of the base housing (4).

NOTE: The retaining nut (3) often loosens when removing the cartridge assembly from the base housing. Be sure to re–torque as described in step 4.

3.Inspect and clean the internal walls of the base housing (4).

NOTE: Be careful that you do not scrape or gouge the internal walls of the base housing, because they are sealing surfaces.

4.Re-torque the retaining nut (3) to 140 to 160 in-lb (16 to 18 NSm).

NOTE: You must re-torque the retaining nut before you install it in the base housing in step 5.

5.Install the new cartridge assembly in the base housing (4), and torque the valve housing (5) to 30 to 35 ft-lb (41 to 48 NSm).

NOTE: The valve seat (14) is double sided and may be reversed for extended life. The o-rings (15, 18 and 20) and ball (16) must be replaced.

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