Graco Inc 288046, 311052E, 288217, G40 General Troubleshooting, Problem Cause Solution

Page 17

Troubleshooting

Troubleshooting

Check all possible remedies in the troubleshooting charts before disassembling the gun.

Some improper patterns are caused by the improper balance between air and fluid. Refer to Spray Pattern Troubleshooting, page 19.

General Troubleshooting

Problem

Cause

Solution

 

 

 

 

 

 

Fluid leakage through venting holes.

Worn packings or needle.

Replace needle assembly. (14)

 

 

 

Air leakage through venting hole.

Worn o-ring (23) or gasket (15).

Check and replace parts as needed.

 

 

 

Air leakage from back of gun.

Worn o-rings (22, 23).

Replace o-rings.

 

 

 

Air does not trigger.

Piston stem is disconnected from

Replace piston assembly.

 

main body of piston assembly (20).

 

 

 

 

Air does not shut off.

Piston assembly not seating properly.

Clean/service piston assembly.

 

 

Replace worn or swollen o-rings.

 

Broken return spring (29).

Replace spring.

 

Swollen o-ring (22).

Replace o-rings.

 

Worn piston stem o-rings (25, 26).

Replace o-rings.

 

Bottom gasket (16) failed.

Replace gasket.

 

 

 

Fluid leakage from front of gun.

Fluid needle (14) dirty, worn, or dam-

Clean or replace fluid needle.

 

aged.

 

 

Dirty or worn diffuser-seat (10).

Clean or replace diffuser-seat.

 

 

To improve sealing while spraying

 

 

lightweight materials and sealing life

 

 

while spraying acid catalyzed materi-

 

 

als, use optional SST ball and plastic

 

 

seat.

 

 

 

Fluid is present at air cap holes.

Spray tip is leaking,

Verify that retainer (8) or RAC air cap

 

 

assembly (30), are tight. If so, replace

 

 

spray tip (9).

 

Diffuser-seat (10) is insufficiently

Tighten diffuser-seat.

 

 

 

tightened.

 

 

 

 

311052E

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Contents Automatic G40 Air-Assisted Spray Guns Related Manuals ContentsG40 Standard Spray Gun, 288046, Series a ModelsG40 Plastic Seat Spray Gun, 288044, Series B G40 RAC Spray Gun, 288053, Series aEquipment Misuse Hazard Pressurized Equipment Hazard Ventilate Spray Booth InstallationConfigure Gun and Manifold Circulating SystemGround System Install Air FittingsReciprocating Arm Rod Mount Mount GunStationary Support Retrofit Adapter PlateConnect Air Line Side Mounted Manifold Ports Connect Fluid LineSetup Operation Pressure Relief ProcedureAdjust Spray Pattern Incorrect Apply FluidCorrect No air Too little air Correct amount AirDaily Gun Care MaintenanceFlushing and Cleaning General System MaintenanceTurn off the solvent supply Problem Cause Solution TroubleshootingGeneral Troubleshooting Problem Cause Solution Spray Pattern Troubleshooting Items Needed for Service ServiceDisassembly TI8173b Cutaway View Part No Gun Shown Reassembly Diffuser Seat ReplacementParts AA RAC Assembly included with Model 288053 onlyPart Ref. No. No Description Qty PartsNorth America and International Manifold Description QtyManifold with Bottom Fluid Ports Part No. Description QtyPart No C343 Side Fluid Ports and Fan Adjustment ValveRING, Ptfe 311052E Typical Air Application Tip Used With Consumption AAP Series Tip and Air Cap Selection ChartsAAP Series Precision Spray Tips LTX Reverse-A-Clean RAC Spray Tips LTX Series RAC Tip Selection ChartsFor use with G40 RAC Housing WRX Wide RAC Spray Tips RAC Switch TipsFFT Fine Finish RAC Spray Tips Accessories Grounding Clamp and Wire In-line Fluid Filter Ultimate Gun Cleaning Kit 15C161Air Cap Seal Kit Plastic Seat Repair KitDimensions Mounting Hole Layout Gun with Rear Port Manifold Rear Port ManifoldTriggering Speed Technical DataSound Data dBa Models 3/16 in. ball Cylinder Air Pressure Fluid PressureGraco Information Graco Standard Warranty
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