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Graco 3A0420T important safety instructions Troubleshooting, Problem Cause Solution

Models: 3A0420T

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Troubleshooting

Troubleshooting

✖ Fluid ratio will be wrong.

◆ Purge all air from system before proportioning

fluids.

Problem

Cause

Solution

System stops or will not start.

Air pressure or volume too low.

Increase; check air compressor.

Closed or restricted air line or air

Open or clean.

valve.

Fluid valves closed.

Open.

Clogged fluid hose.

Replace.

Air motor worn or damaged.

Repair air motor; see 311238.

Displacement pump stuck.

Repair pump; see 311762.

System speeds up or runs erratically.

Fluid containers are empty.◆

Check often; keep filled.

Air in fluid lines.◆

Purge; check connections.

Displacement pump parts worn or

Repair pump; see 311762.

damaged.

Pump operates, but resin output

Dirty, worn, or damaged resin pump

Clean, repair pump; see 311762.

pressure drops on upstroke.✖

piston valve or piston packings.

Pump operates, but resin output

Dirty, worn, or damaged resin pump

Clean, repair pump; see 311762.

pressure drops on downstroke.

intake valve.

Pump operates, but resin output

Hardener output restriction.

Clean, unplug hardener side. Open

pressure drops on both strokes.✖

manifold restrictor.

Fluid supply low.◆

Refill or change container.

Pump operates, but hardener output

Dirty, worn, or damaged hardener

Clean, repair pump; see 311762.

pressure drops on upstroke.✖

pump piston valve or piston pack-

ings.

Pump operates, but hardener output

Dirty, worn, or damaged hardener

Clean, repair pump; see 311762.

pressure drops on downstroke.✖

pump intake valve.

Pump operates, but hardener output

Resin output restriction.

Clean, unplug resin side.

pressure drops on both strokes.

Fluid supply low.◆

Refill or change container.

Fluid leak in packing nut.

Loose packing nut or worn throat

Tighten; replace; see 311762.

packings.

Fluid leak under packing nut

Packing cartridge o-ring.

Replace o-ring; see 311762

Relief valve (AM) leaks back to sup-

Relief valve is dirty or damaged.

Replace over pressure relief

ply, opens too soon, or will not close.

valve (302)

No pressure on hardener side; fluid

Overpressure rupture disk blown.

Determine cause of overpressuriza-

leaking from hardener pump outlet

tion and correct. Replace rupture disk

rupture disc fitting.

assembly 258962 (see page 51) and

over pressure relief valve (302).

Pressure and flow surges on

Feed pressure too high. Every 1 psi

Reduce feed pressure. See Techni-

upstroke.

of feed pressure adds 2 psi during

cal Data, page 57.

upstroke.

3A0420T

33

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Graco 3A0420T important safety instructions Troubleshooting, Problem Cause Solution

Contents

XP Proportioners Contents Related Manuals Fire and Explosion Hazard Skin Injection Hazard Toxic Fluid or Fumes Hazard Important Two-Component Material Information Changing Materials B Component DesignationsEquipment Designations Overview UsageOver Pressure Protection Initial System Setup Cart-Mounted Systems ModelsPump Volume Max Fluid Max Air Mix Gallon Building systems with bare proportioning pump Bare Proportioning Pump PackagesPackages Over Pressure Protection must be used, seeMounting Components for Component IdentificationMain Air Controls Fluid Control AssemblySolvent Flush Pump Kit 262393 optional Pump KeyAir Controls Flush Before Using Equipment Fluid Line AccessoriesOptional Accessories Air LineSetup LocationGrounding Hazardous location systems only Wire Systems with Explosion-Proof HeatersMotor Position Check Motor PositionChange Motor Position Connect Air Supply Connect Fluid Hose Bundles Remote Mix Manifold OnlyConnect Static Mixers, Gun, and Hoses Relieve a and B Fluid Pressure Pressure Relief ProcedurePrime a and B Fluids Prime Empty SystemPrime Solvent Flush Pump Follow Prime Empty System, Heat FluidSpray Side Mix Manifold Restriction To Adjust the RestrictorFlush Mixed Material Follow Pressure Relief Procedure,Flush Mix Manifold, Hose, and Spray Gun Use Optional Solvent PumpGuidelines ProcedurePark ShutdownSystem Verification Maintenance Problem Cause Solution TroubleshootingHardener Pump Falling Pump TroubleshootingTrouble Area Resin Pump Leakage Resin PumpRemove Pump Assembly Pump AssemblyRemove Displacement Pump RepairRemove Motor Replace Air Control AssemblyReplace Air Filter Element Replace System Air RegulatorAir Flow Air Control AssemblyMix Manifold Assembly Fluid Circulation Manifold with Over Pressure Relief ValvesReplace Over Pressure Relief Valves Circulation Fluid Circulation Manifold Replacement GuideTarget Opening Manifold Valve Pressure Color Psi MPa, bar Use withOptional Solvent Pump HoppersService and Repair Optional Fluid HeatersReplace Cart-Mounted System PartsStandard Mix Manifold Models Quickset Mix Manifold Models Washer Parts Common to All Systems Description QtyParts Varying By Model XP35 Systems Ref Part Description Coupling 283101 283102 283201 283202 283301 283302 283401 283402 Parts Varying By Model XP70 Systems Part Description Model 571100 shown Bare Proportioning Pump PackageParts Varying by Pump Package Parts Common to All Pump PackagesQty Ref. No. Part No. Description Air ControlsFluid Circulation Manifold with Over Pressure Relief Valve Assembly 262784 XP35 262783 XP50 262806 XP70Part Description Qty Ref Manifold to also fit Series a XP Proportioners withPump Repair Kits Recommended Spare PartsPump Filter O-rings packs Recirculation/Overpressure valve seeAcceptable For Use in Explosive Atmospheres Accessories and KitsNot Approved For Explosive Atmospheres Technical Data Dimensions Top ViewSide View Floor Mounting Dimensions, Top View Bare Proportioner Mounting Hole Dimensions Wall Mount Bracket 262812 Dimensions Hydraulic Unit Dimensions Floor Stand 24M281 DimensionsDimensions 3A0420T Graco Information Graco Standard Warranty