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

Service

Diaphragms (Husky 515)

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. 9 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. 9.

Disassembly

1.Relieve the pressure. See

Pressure Relief Procedure on page 10.

2.Remove manifolds (102 and 103) and fluid cov- ers (101).

NOTE: Make sure all the check valve parts stay in place. See Fig. 7 on page 15.

3.Remove one of the fluid-side diaphragm plates (105) (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: The air cover bolts may make it difficult to remove the overmolded diaphragms on the 515 pump. Use a flat surface that fits within the bolt pattern to apply pressure on one of the diaphragms to shift the diaphragm shaft to one side. Apply pressure until the other dia- phragm is separated from the air cover. Rotate the separated diaphragm counterclockwise until the diaphragm assembly comes free. Pull the second diaphragm assembly and the diaphragm shaft (15) out of the center housing. (11)

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

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

(105)from the diaphragm shaft.

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

5.Remove the screws (106), remove the left (114) and right (113) air covers, and remove all old gasket (12) material from the ends of the center housing (11) and the surfaces of the air covers.

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

7.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 bores of the center housing

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 (106) to fasten an air cover (113 or 114) 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 fluid-side diaphragm plates

(105). Install on one end of the diaphragm shaft

(15)the following parts (see proper order in Fig. 9): air-side diaphragm plate (6), backup diaphragm (402, used only on models with PTFE dia- phragms), diaphragm (401), and fluid-side dia- phragm plate (105).

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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