Graco 308550ZAD Service, Repairing the Air Valve, Tools Required, Disassembly

Page 16

Service

Repairing the Air Valve

Tools Required

DTorque wrench

DTorx (T20) screwdriver or 7 mm (9/32”) socket

DNeedle-nose pliers

DO-ring pick

DLithium base grease

NOTE: Air Valve Repair Kits 236273 (aluminum center housings) and 255061 (stainless steel center hous- ings) are available. Refer to page 27. Parts included in the kit are marked with a symbol, for example (4{H). Use all the parts in the kit for the best results.

Disassembly

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 12.

1.

Relieve the pressure.

2.

With a Torx (T20) screwdriver or 7 mm (9/32”)

 

socket wrench, remove the six screws (3), air

 

valve cover (2), and gasket (4). See Fig. 7.

32

2 4{H

Torque to 50–60 in-lb

2

 

 

 

(5.6–6.8 NSm).

 

 

 

 

04618B

Fig. 7

 

 

 

 

 

 

 

 

1

See Detail at right.

5

3. Move the valve carriage (5) to the center position

and pull it out of the cavity. Remove the valve

2 Grease.

3 Grease lower face.

2 H{6

block (7) and o-ring (6) from the carriage. Using a

needle-nose pliers, pull the pilot block (18) straight

up and out of the cavity. See Fig. 8.

4. Pull the two actuator pistons (11) out of the bear-

ings (12). Remove the u-cup packings (10) from

the pistons. Pull the pilot pins (16) out of the

bearings (15). Remove the o-rings (17) from the

pilot pins. See Fig. 9.

5. Inspect the valve plate (8) in place. If damaged,

use a Torx (T20) screwdriver or 7 mm (9/32”)

socket wrench to remove the three screws (3).

Remove the valve plate (8) and, on aluminum

center housing models only, remove the seal (9).

See Fig. 10.

6. Inspect the bearings (12, 15) in place. See Fig. 9.

The bearings are tapered and, if damaged, must

be removed from the outside. This requires disas-

sembly of the fluid section. See page 23.

7. Clean all parts and inspect for wear or damage.

Replace as needed. Reassemble as explained on

page 17.

3 H{7

H{18 3

5 1

11

16

04900

Fig. 8

16 308550

Page 15 Page 17
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Page 15 Page 17
Contents Instructions Parts List Important Safety InstructionsTable of Contents ModelsSymbols Equipment Misuse HazardToxic Fluid Hazard Installation General InformationTighten Screws Before First Use Toxic Fluid HazardGrounding Ground all of this equipmentTypical FLOOR-MOUNT Installation Air LineInstallation of Remote Pilot Air Lines MountingsFluid Suction Line Fluid Outlet LineFlange Connections Bolt Tightening SequenceChanging the Orientation of the Fluid Inlet and Outlet Ports Fluid Pressure Relief ValveFire and Explosion Hazard Air Exhaust VentilationVenting Exhaust AIR Pressure Relief Procedure Starting and Adjusting the PumpOperation Flush the Pump Before First UseMaintenance Troubleshooting Problem Cause SolutionTroubleshooting Service Repairing the Air ValveDisassembly Tools RequiredReassembly Ball Check Valve Repair Relieve the pressure. Disconnect all hosesDiaphragm Repair Reassembly Standard Diaphragms Reassembly Overmolded Diaphragms 105 19 402 24 104 403 Bearing and Air Gasket Removal Detail of Air Valve Bearings Pump Matrix Husky 2150 Polypropylene and Pvdf Pumps, Series aRepair Kit Matrix For Husky 2150 Polypropylene and Pvdf Pumps, Series aAir Motor Parts List Matrix Column PartsFluid Section Parts List Matrix Column MufflerBall Parts List Matrix Column Seat Parts List Matrix ColumnDiaphragm Parts List Matrix Column 114 Torque Sequence Front View DimensionsSide View Pump Mounting Hole Pattern Dimension SST Center Aluminum Polypropylene Pvdf Cover Technical Data 14-0.8 MPa, 1.4-8 barPerformance Chart Feet metersPsi MPa, bar Fluid Flow GPM lpmGraco Warranties Graco Information
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