Graco Inc 308639L important safety instructions Disassembly Relieve the pressure

Service

Disassembly

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 9.

WARNING

Some of the pump parts and assemblies are heavy. Use proper lifting equipment and techniques.

2.Remove the manifolds and disassemble the ball check valves as explained in Ball Check Valve Repair on page 14.

3.Using a 15-mm socket wrench, remove the screws (54), and pull the fluid covers off the pump. See Fig. 7.

For steps 4 to 9, see Fig. 8.

4.Using 15/16-in. wrenches or sockets, loosen but do not remove one of the diaphragm plate bolts

(62).(whichever one turns)

5.Remove the fluid-side plate (52), diaphragm (301), and air-side plate (57).

For models with PTFE diaphragms, also remove the shim (302) and back-up diaphragm (303).

6.Pull the other diaphragm assembly and the diaphragm shaft (14) out of the center housing (2). Hold the shaft flats with a 7/8-in. wrench, and remove the remaining fluid-side plate (52) from the shaft. Disassemble the remaining diaphragm assembly.

7.Inspect the diaphragm shaft (14) for wear or scratches. If it is damaged, inspect the bearings

(13)in place. If the bearings are damaged, see

Removing and Replacing Bearings and Air Gasket on page 18.

8.Reach into the center housing (2) with an o-ring pick, and hook the u-cup seals (15), then pull them out of the housing. This can be done with the bearings (13) in place.

9.Clean all parts and inspect for wear or damage. Replace parts as needed.

Reassembly (See Fig. 8)

1.Install each u-cup seal (15) so the lips face away from the center of the pump. Lubricate the u-cup seals.

2.Install a diaphragm assembly on one end of the shaft (14) as follows:

a.Place a washer (63) and then a white o-ring

(64)on the diaphragm bolt (62). The o-ring may fit very snugly on the bolt. Insert the bolt into the fluid-side diaphragm plate (52) as shown in Fig. 8. Grease the bolt threads.

b.Lay the diaphragm (301) into the grooves on the fluid-side diaphragm plate (52) so that the side marked AIR SIDE faces the center of the pump.

For models with bolt–through PTFE diaphragms, also install the shim (302) and back-up diaphragm (303), as shown in Fig. 8. Line up diaphragm tabs with tabs on air cover. The bolts must go through the bolt–through PTFE diaphragm.

c.Place the air-side diaphragm plate (57) and washer (63) over the bolt. Screw the shaft

(14)onto the bolt handtight.

3.Grease the length of the shaft (14), and slide it through the center housing (2).

4.Assemble the other diaphragm assembly to the shaft as explained in step 2.

Step 5 is easiest if the pump is mounted vertically in a vise.

5.Torque the bolts (62) to 100 to 120 ft-lb (136 to 163 NSm).

WARNING

Failure to properly torque the diaphragm bolts (62) could result in a bolt failure. If a diaphragm bolt fails, fluid is exhausted through the muffler. See Air Exhaust Ventilation on page 7.

6.Install the fluid cover screws (54) hand tight. Torque the screws to 55 to 60 ft-lb (75 to 81 NSm) in a crossing pattern. See Fig. 7. See Torque Sequence, page 25.

7.Reassemble the ball check valves and manifolds as explained on page 14.

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