Graco Inc 308639L Service, Repairing the Air Valve, Tools Required, Groove

Page 12

Service

Repairing the Air Valve

Tools Required

DTorque wrench

D7-mm or 9/32-in. socket wrench or TorxR screwdriver T20

DNeedle-nose pliers

DO-ring pick

DLithium-base grease, Part No. 111920 (Lubriplate 630AA or equivalent)

NOTE: Air Valve Service Kit 238765 is available. Parts included in the Air Valve Service Kit are marked with a symbol in the Air Motor Parts List, for example (3{). See page 23. Use all the parts in the kit for the best results.

Disassembly (See Fig. 4)

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.

2.With a 7-mm or 9/32-in. socket wrench or TorxR T20 screwdriver, remove the screws (3), air valve cover (5), and valve cover gasket (20).

3.Move the main valve (6) to the center position, and pull it out of the cavity. Using a needle-nose pliers, pull the pilot block (16) straight up and out of the cavity.

4.Pull the two actuator pistons (7) out of the bearings (8). Remove the u-cup seals (9) from the pistons. Pull the push pins (18) out of the bearings

(17).Remove the o-rings (19) from the housing

(2)with an o-ring pick.

5.Inspect the valve plate (11) in place. If damaged, use a TorxR T20 screwdriver or 7-mm or 9/32-in. socket wrench to remove the screws (3).

6.Remove the valve plate (11) and seal (12). See Fig. 5.

7.Inspect the bearings (8 and 17) in place. The bearings are tapered, and, if damaged, must be removed from the outside. See Removing and Replacing Bearings and Air Gasket on page 18.

8.Clean all parts and inspect for wear or damage. Replace as needed. Reassemble as explained on page 13.

23

5

20

6

2

11

3

2

 

 

 

 

8

19 6

 

16 1

 

17

groove

 

 

 

18

4

1

Apply grease to lapped

3 6 9

 

06323

surfaces of 16.

5 7

 

 

2Torque to 28 to 50 in-lb (3.2 to 5.6 NSm).

3Install with lips facing narrow end of piston.

4Insert narrow end first.

5Insert wide end first.

06322

6 Grease.

Fig. 4

12 308639

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Contents Instructions Parts List ContentsEquipment Misuse Hazard 308639Hazardous Fluids Installation General InformationTightening Screws Before First Use Grounding Hazardous FluidsFLOOR-MOUNT Typical Installation KEYMountings Air LineFluid Lines Fluid Outlet LineChanging Manifold Orientation Fluid Pressure Relief ValveAir Exhaust Ventilation Toxic Fluid HazardVenting Exhaust AIR Pressure Relief Procedure Starting and Adjusting the PumpOperation Flush the Pump Before First UseMaintenance Preventive Maintenance ScheduleLubrication Flushing and StorageTroubleshooting Problem Cause SolutionService Repairing the Air ValveDisassembly See Fig Relieve the pressure Tools RequiredReassembly Ball Check Valve Repair Diaphragm Repair Disassembly Relieve the pressure Removing and Replacing Bearings and Air Gasket on302 301 Removing and Replacing Bearings and Air Gasket See Fig Detail of Bearings Through hole must be on bottomPump Matrix Husky 3275 Pumps, Series C232505, Aluminum 3275 Pump, Series C 24D619, Aluminum 3275 Pump, Series aRepair Kit Matrix For Husky 3275 Pumps, Series CParts Drawing 303 301 302 61 2 114 201 102 101 201* 102Parts Lists Air Motor Parts List Matrix ColumnFluid Section Parts List Matrix Column Digit Description QtyTechnical Data Seat Parts List Matrix ColumnBall Parts List Matrix Column Diaphragm Parts List Matrix ColumnTorque Sequence Dimensional Drawings Front ViewPump Mounting Hole Pattern Side ViewPerformance Charts Fluid Outlet PRESSURE--psi MPa, barFluid Pressure Curves AIR CONSUMPTION--scfm cubic meters/min Air Consumption Curves308639 Graco Warranties Graco InformationToll Free, 612-623-6921, 612-378-3505 Fax Graco Headquarters Minneapolis
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