Graco Inc D 5 D Service, Diaphragms Husky, Disassembly 1. Relieve the pressure. See, Reassembly

Service

Diaphragms (Husky 716)

NOTE: Fluid Section Repair Kit D05XXX is available. See page 22 to order the correct kit for your pump. Parts included in the kit are marked with a double dagger (}) in Fig. 10 and in the Parts Drawings and Lists. General purpose grease 111920 and Adhesive 113500 are supplied in the kit. Service the diaphragms as follows. See Fig. 10.

Disassembly

1.Relieve the pressure. See

Pressure Relief Procedure on page 10.

2.Remove the manifolds (102) and fluid cov- ers (101).

NOTE: Make sure all the check valve parts stay in place. See Fig. 8 on page 15.

3.Remove the grounding strip from the vee clamps (109), and remove the vee clamps.

4.Remove one of the fluid-side diaphragm plates (133) (whichever one comes loose first when you use a wrench on the hex of each), and pull the diaphragm shaft out of the center housing (11).

Overmolded Diaphragms: Grip both diaphragms securely around the outer edge and rotate counter- clockwise. One diaphragm assembly will come free and the other will remain attached to the diaphragm shaft (15). Remove the freed dia- phragm and the air side plate (6). Pull the other diaphragm assembly and the diaphragm shaft (15) out of the center housing (11).

5.Use a wrench on the flats of the diaphragm shaft

(15)to remove the other fluid-side diaphragm plate

(133)from the diaphragm shaft.

Overmolded Diaphragms: Use a wrench on the flats of the diaphragm shaft (15) to remove the second diaphragm from the diaphragm shaft.

6.Remove the screws (141) and air covers (136), and remove all old gasket (12) material from the ends of the center housing (11) and the surfaces of the air covers.

7.Remove the diaphragm shaft u-cups (416) and pilot pin o-rings (1).

8.Inspect all parts for wear or damage, and replace as necessary.

Reassembly

1.Insert a diaphragm shaft u-cup (416) and a pilot pin o-ring (1) into the end of the diaphragm shaft bore of the center housing (11).

NOTE: Make sure the lips of the u-cup face out of the center housing.

2.Line up the holes in the gasket (12) with the holes in the end of the center housing (11), and use six screws (141) to fasten an air cover (136) to the end of the center housing (11). Torque the screws to 35 to 45 in-lb (4.0 to 5.1 N-m).

3.Position the exhaust cover (13) and o-ring (4) on the center housing (11).

4.Repeat steps 1 and 2 for the other end of the center housing and the remaining air cover.

5.Apply medium-strength (blue) Loctite or equivalent to the threads of the screws (140). Install on one end of the diaphragm shaft (15) the following parts (see proper order in Fig. 10): air-side diaphragm plate (6), backup diaphragm (402, used only on models with PTFE diaphragms), diaphragm (401), fluid-side diaphragm plate (133), o-ring (115), and screw (140).

NOTE: The words “AIR SIDE” on the diaphragm (401), the backup diaphragm (402, used only on models with PTFE diaphragms), and the flat side of the air-side diaphragm plate (6) must face toward the diaphragm shaft (15).

Overmolded Diaphragms: Assemble the air–side plate (6) onto the diaphragm (401). The words AIR SIDE on the air side plate must face away from the diaphragm. Apply medium–strength (blue) thread locking adhesive to the threads of the diaphragm assembly. Screw the assembly into the diaphragm shaft (15) hand tight.

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