Graco XP70s-hf 577222 [53/86] Troubleshooting

Graco XP70s-hf 577222 [53/86] Troubleshooting
Troubleshooting
3A6283H 53
Troubleshooting
1. Follow Pressure Relief Procedure on page 43
before checking or repairing the system.
2. Check all possible problems and causes before
disassembling the gun.
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 valve. Open or clean.
Fluid valves closed. Open.
Clogged fluid hose. Replace.
Air motor worn or damaged. Repair air motor; see your air motor
manual.
Displacement pump stuck. Repair pump; see your Xtreme pump
manual.
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
damaged.
Repair pump; see your Xtreme pump
manual.
Pump operates, but resin output
pressure drops on upstroke.
Dirty, worn, or damaged resin pump
piston valve or piston packings.
Clean, repair pump; see your Xtreme
pump manual.
Pump operates, but resin output
pressure drops on downstroke.
Dirty, worn, or damaged resin pump
intake valve.
Clean, repair pump; see your Xtreme
pump manual.
Pump operates, but resin output
pressure drops on both strokes.
Hardener output restriction. Clean, unplug hardener side. Open
manifold restrictor.
Fluid supply low. Refill or change container.
Pump operates, but hardener
output pressure drops on
upstroke.
Dirty, worn, or damaged hardener pump
piston valve or piston packings.
Clean, repair pump; see your Xtreme
pump manual.
Pump operates, but hardener
output pressure drops on
downstroke.
Dirty, worn, or damaged hardener pump
intake valve.
Clean, repair pump; see your Xtreme
pump manual.
Pump operates, but hardener
output pressure drops on both
strokes.
Resin output restriction. Clean, unplug resin side.
Fluid supply low. Refill or change container.
Fluid leak in packing nut. Loose packing nut or worn throat
packings.
Tighten; replace; see your Xtreme
pump manual.
Fluid leak under packing nut Packing cartridge o-ring. Replace o-ring; see your Xtreme
pump manual.
Relief valve (AM) leaks back to
supply, opens too soon, or will not
close.
Relief valve is dirty or damaged. Replace over pressure relief
valve (302)

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