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Troubleshooting
3A0420H 31
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
valve.
Open or clean.
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
damaged.
Repair pump; see 311762.
Pump operates, but resin output
pressure drops on upstroke.✖
Dirty, worn, or damaged resin pump
piston valve or piston packings.
Clean, repair pump; see 311762.
Pump operates, but resin output
pressure drops on downstroke.
Dirty, worn, or damaged resin pump
intake valve.
Clean, repair pump; see 311762.
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 311762.
Pump operates, but hardener output
pressure drops on downstroke.✖
Dirty, worn, or damaged hardener
pump intake valve.
Clean, repair pump; see 311762.
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 311762.
Fluid leak under packing nut Packing cartridge o-ring. Replace o-ring; see 311762
Relief valve (AM) leaks back to sup-
ply, opens too soon, or will not close.
Relief valve is dirty or damaged. Replace valve cartridge (302) with kit
262520.
No pressure on hardener side; fluid
leaking from hardener pump outlet
rupture disc fitting.
Overpressure rupture disk blown. Determine cause of overpressuriza-
tion and correct. Replace rupture disk
assembly (140) and over-pressure
cartridge (302).
Pressure and flow surges on
upstroke.
Feed pressure too high. Every pound
of feed pressure adds 2 psi boost
during upstroke.
Reduce feed pressure. See Techni-
cal Data, page 53.