Troubleshooting - Graco XP35 Instructions Manual

Troubleshooting

Troubleshooting
Problem
System stops or will not start.
System speeds up or runs erratically. Fluid containers are empty.
Pump operates, but resin output
pressure drops on upstroke.
Pump operates, but resin output
pressure drops on downstroke.
Pump operates, but resin output
pressure drops on both strokes.
Pump operates, but hardener output
pressure drops on upstroke.
Pump operates, but hardener output
pressure drops on downstroke.
Pump operates, but hardener output
pressure drops on both strokes.
Fluid leak in packing nut.
Fluid leak under packing nut
Relief valve (AM) leaks back to sup-
ply, opens too soon, or will not close.
No pressure on hardener side; fluid
leaking from hardener pump outlet
rupture disc fitting.
Pressure and flow surges on
upstroke.
36
 Fluid ratio will be wrong.
 Purge all air from system before proportioning
Cause
Air pressure or volume too low.
Closed or restricted air line or air
valve.
Fluid valves closed.
Clogged fluid hose.
Air motor worn or damaged.
Displacement pump stuck.
Air in fluid lines.
Displacement pump parts worn or
damaged.
Dirty, worn, or damaged resin pump
piston valve or piston packings.
Dirty, worn, or damaged resin pump
intake valve.
Hardener output restriction.
Fluid supply low.
Dirty, worn, or damaged hardener
pump piston valve or piston pack-
ings.
Dirty, worn, or damaged hardener
pump intake valve.
Resin output restriction.
Fluid supply low.
Loose packing nut or worn throat
packings.
Packing cartridge o-ring.
Relief valve is dirty or damaged.
Overpressure rupture disk blown.
Feed pressure too high. Every 1 psi
of feed pressure adds 2 psi during
upstroke.
fluids.
Increase; check air compressor.
Open or clean.
Open.
Replace.
Repair air motor; see 311238.
Repair pump; see 311762.
Check often; keep filled.
Purge; check connections.
Repair pump; see 311762.
Clean, repair pump; see 311762.
Clean, repair pump; see 311762.
Clean, unplug hardener side. Open
manifold restrictor.
Refill or change container.
Clean, repair pump; see 311762.
Clean, repair pump; see 311762.
Clean, unplug resin side.
Refill or change container.
Tighten; replace; see 311762.
Replace o-ring; see 311762
Replace over pressure relief
valve (302)
Determine cause of overpressuriza-
tion and correct. Replace rupture disk
assembly 258962 (see page 57) and
over pressure relief valve (302).
Reduce feed pressure. See Techni-
cal Data, page 63.
Solution
3A0420V