Replace Mix Chamber and Front Seal | Graco Inc 313872B, 257999

Maintenance

Replace Mix Chamber and Front Seal

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17 18

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1.Use nut driver to open the Throat Seal Liquid bleed port and drain all Throat Seal Liquid or replace with empty cartridge.

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FIG. 24: Open the Bleed Port

2.Follow Pressure Relief Procedure on page 22.

3.Close Throat Seal Liquid bleed port.

4.Use 5/16 in. nut driver (supplied) to remove orifices (25, 26, 27).

5.Use a 3/4 in. wrench to remove front pour tip (19).

6.Connect air quick coupler (AC).

7.Press and release trigger to push out the mix chamber (17) and front seal (18) and discard.

8.Disconnect air quick coupler (AC).

9.Install new mix chamber and front seal.

10.Replace front pour tip and torque to 60-70 in-lb (6.78-7.91 N•m).

NOTICE

To prevent cross-contamination of the orifices do not interchange A component and B component parts. The A component orifice is marked with an A.

11.Replace orifices. Torque to 20-30 in-lb (2.26-3.39 N•m).

12.Perform Replace Throat Seal Liquid Cartridge, page 31.

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313872B

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Graco Inc 313872B, 257999, 24C934, 24C932 Replace Mix Chamber and Front Seal, Perform Replace Throat Seal Liquid Cartridge

Contents

Important Safety Instructions EP Gun Contents Related Manuals Orifice Flow Area Ratio Chart Models Fixed Orifice Flowrate Data EP Fixed Orifice Flow Data Variable Orifice Flowrate Data Orifice DiameterFlowrate gpm Variable Orifice Flowrate Data 1500 PSI Variable Orifice Flowrate Data 2000 PSI Toxic Fluid or Fumes Hazard Fire and Explosion Hazard Important Two-Component Material Information Changing Materials Red and B Blue Components Grounding Piston Safety LockThroat Seal Liquid Trigger Lock Loss of Air Pressure Hook Support Hook Support 313872B Component Identification Key Cutaway View Theory of Operation Gun Triggered Fluid PouringGun Detriggered Setup Adjust Orifices Perform Bleed Throat Seal Liquid Cartridge pro- cedure. SeeOrder to increase the pressure, turn the needle clockwise Follow Pressure Relief Procedure, Optional Hose Position Pressure Relief Procedure Short Term Shutdown Perform Pressure Relief Procedure onShutdown Long Term Shutdown Lubrication MaintenanceSupplied Tool Kit Bleed Throat Seal Liquid Cartridge Clean Outside of Gun Flush Gun Clean Breather Plug Clean Fluid ManifoldFollow Pressure Relief Procedure Clean Check Valves Clean Fluid Housing Passages Follow Pressure Relief Procedure onRemove Front End, see Clean Orifice Replace Mix Chamber and Front Seal Perform Replace Throat Seal Liquid Cartridge, Repair Tools RequiredReplace Throat Seal Liquid Cartridge Perform Bleed Throat Seal Liquid Cartridge pro- cedure, see Perform Pressure Relief Procedure, Remove Front End Disassemble Front End Assemble Front End See Attach Front End procedure Attach Front EndPistons and Bulkhead Access Pistons Bulkhead Shaft Purge Rod Solenoid Valve 26-3.39 Nm. See Component Identification on Troubleshooting Problem Cause Solution Problem Cause Solution Electrical Diagram Parts Model 257999 Shown Orifice, Auto Hand-Held Ring Orifice, Auto Hand-Held Kits See OrificeKits on Orifice 24C751 Orifice Housing 24C756 Ring 24C805 24C815 Kits Kits Located inside back cap Orifice Kits Impingement Kit Type and Kit NumberModel Iso Model Polyol Orifice Kit Drill Bit Kits Kit Drill Bit Qty Orifice Size NumberKit Illustration Complete O-ring Placement Guide Ref Part Accessories Solvent Flush Canister Kit Solvent Flush Pail Kit248299 5.0 gal liter Pail Technical Data Models without Handle 6.4 lb 2.9 kg Dimensions Ref Dimension, in. mm Technical Data 313872B Graco Standard Warranty Graco Information