Troubleshooting - Graco xtreme Instruction Manual

Troubleshooting

1. Follow Pressure Relief Procedure, page 13.
Problem
Does not operate. Valve closed or clogged.
Output low on both
strokes.
Output low on down
stroke.
Output low on
upstroke.
Erratic accelerated
speed.
Runs sluggishly.
Cycles or fails to hold
pressure at stall.
Air bubbles in fluid.
Poor finish or irregu-
lar spray pattern.
* To determine if fluid hose or gun is obstructed, follow Pressure Relief Procedure, page 13. Disconnect fluid
hose and place a container at pump fluid outlet to catch any fluid. Turn on air power just enough to start pump. If
pump starts, the obstruction is in fluid hose or gun.
311164M
Cause
Fluid hose or gun obstructed.
Dried fluid on displacement rod.
Air motor parts dirty, worn, or damaged.
Runaway error on DataTrak tripped.
Air line restricted or air supply inadequate.
Valves closed or clogged.
Fluid hose/gun obstructed; hose ID too small. Clear hose or gun*; use hose with larger ID.
Air motor icing.
Open or worn intake valve.
High viscosity fluid.
Open or worn piston valve or packings.
Fluid supply exhausted, clogged suction.
High viscosity fluid.
Open or worn piston valve or packings.
Open or worn intake valve.
Possible icing.
Worn check valves or seals.
Loose suction line.
Incorrect fluid pressure at gun.
Fluid is too thin or too thick.
Dirty, worn, or damaged spray gun.
2. Check all possible causes and problems before dis-
assembling pump.
Clear air line; increase air supply. Check that
valves are open.
Clean hose or gun.*
Clean rod; always stop pump at bottom of
stroke; keep wet-cup filled with compatible
solvent.
Clean or repair air motor. See motor manual.
See DataTrak Operation-Runaway, page
20.
Clear air line; increase air supply. Check that
valves are open.
Open De-Ice control; see page 11.
Clear or service intake valve.
Adjust intake spacers.
Clear piston valve; replace packings.
Refill supply and prime pump. Clean suction
tube.
Reduce viscosity; adjust intake spacers.
Clear piston valve; replace packings.
Clear or service intake valve.
Stop pump. Open De-Ice control; see page
11.
Service lower. See Xtreme Lower Removal,
page 24, and Xtreme Lowers manual
(311762).
Tighten. Use compatible liquid thread sealant
or PTFE tape on connections.
See gun manual; read fluid manufacturer's
recommendations.
Adjust fluid viscosity; read fluid manufac-
turer's recommendations.
Service spray gun. See spray gun manual.
Troubleshooting
Solution
23