Graco Troubleshooting for XP70 Paint Sprayers

Page 31

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 packings.

 

 

 

 

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 valve cartridge (302) with kit

ply, opens too soon, or will not close.

 

 

 

 

262520.

 

 

 

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 (140) and over-pressure

 

 

 

 

 

 

 

 

 

 

 

cartridge (302).

 

 

 

Pressure and flow surges on

Feed pressure too high. Every pound

Reduce feed pressure. See Techni-

upstroke.

of feed pressure adds 2 psi boost

cal Data, page 53.

 

 

 

 

 

 

 

during upstroke.

 

 

 

 

 

 

 

 

 

 

 

 

 

3A0420H

31

Image 31
Contents XP70 Plural-Component Sprayer Contents Manual Description Related ManualsFire and Explosion Hazard Skin Injection Hazard Toxic Fluid or Fumes Hazard Important Two-Component Material Information B Component Designations Changing MaterialsMachine Left Machine Right Market Equipment Designations Usage OverviewOver Pressure Protection Initial System Setup Cart-Mounted XP70 Sprayers ModelsBare Proportioning Pump Packages Mounting Components for Component IdentificationMain Air Controls Fluid Control AssemblyIncluded with optional solvent flush pump kit Key Solvent Flush Pump Kit 262393 optionalAir Line Fluid Line AccessoriesFlush Before Using Equipment Optional AccessoriesLocation SetupGrounding Hazardous location sprayers only Wire Sprayers with Explosion-Proof HeatersPosition Air Motor Air Motor PositionConnect Fluid Hose Bundles Remote Only Connect Air SupplyConnect Static Mixers, Gun, and Hoses Relieve a and B Fluid Pressure Pressure Relief ProcedurePrime a and B Fluids Prime Empty SprayerPrime Solvent Flush Pump Heat Fluid Recirculate or Re-Prime After a Pump Runs DryWithout Heat With HeatSpray Side Mix Manifold Restriction Use Optional Solvent Pump Follow Pressure Relief Procedure,Flush Mixed Material Flush Mix Manifold, Hose, and Spray GunGuidelines ProcedurePark ShutdownSystem Verification Maintenance Problem Cause Solution TroubleshootingPump Troubleshooting Repair Pump AssemblyRemove Pump Assembly Remove Displacement PumpReplace Air Filter Element Replace Air Control AssemblyAir Controls Remove Air MotorAir Flow Air Control AssemblyFluid Circulation Manifold Mix Manifold AssemblyReplace Drain Valve Cartridges Repair Solvent Pump HoppersOptional Fluid Heaters Service and RepairReplace Cart-Mounted XP70 Sprayer Parts49 a 49 B 27, 28 32 27 Part Description Qty Common PartsParts Varying by Model with No Hoppers Parts Varying by Model with Hoppers122 106 105 135 117 108 101 138 139 140 Bare Proportioning Pump PackageRatio Description Varying Parts571100 571150 571200 571250 571300 571400 Qty Ref. No. Part No. Description Qty 202 211 205 209 210Part No. Description Qty Fluid ManifoldPump Repair Kits Recommended Spare PartsPump Filter O-rings packs 11 or 21 Mix Ratio Pump Performance ChartsCalculate Fluid Outlet Pressure Calculate Pump Air Flow/ConsumptionMix Ratio Pump Performance Charts31 Mix Ratio Pressure BarMPa PsigAcceptable For Use in Explosive Atmospheres Accessories and KitsNot Approved For Explosive Atmospheres Psi MPa, bar Psi MPa, psi Gpm ltr/min Technical DataSide VIew DimensionsFloor Mounting Dimensions Top VIew Top VIewBare Proportioner Mounting Hole Dimensions Graco Information Graco Standard Warranty