Graco Xtreme 24N976, Instructions - Parts Manual

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Troubleshooting
3A2851A 13
Troubleshooting
1. Follow Pressure Relief Procedure , page 10.
2. Check all possible causes and problems before dis-
assembling pump.
* To determine if fluid hose or gun is obstructed, follow Pressure Relief Procedure , page 10 . 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.
Problem Cause Solution
Does not operate. Valve closed or clogged. Clear air line; increase air supply. Check that
valves are open.
Fluid hose or gun obstructed. Clean hose or gun.*
Dried fluid on displacement rod. Clean rod; always stop pump at bottom of
stroke; keep wet-cup filled with compatible
solvent.
Air motor parts dirty, worn, or damaged. Clean or repair air motor. See motor manual.
Runaway error on DataTrak tripped. See DataTrak Operation in Air Motor man-
ual.
Output low on both
strokes. Air line restricted or air supply inadequate.
Valves closed or clogged. Clear air line; increase air supply. Check that
valves are open.
Fluid hose/gun obstructed; hose ID too small. Clear hose or gun*; use hose with larger ID.
Air motor icing. Open De-Ice control; see Air Motor manual.
Output low on down
stroke. Open or worn intake valve. Clear or service intake valve.
High viscosity fluid. Adjust intake spacers.
Output low on
upstroke. Open or worn piston valve or packings. Clear piston valve; replace packings.
Erratic accelerated
speed. Fluid supply exhausted, clogged suction. Refill supply and prime pump. Clean suction
tube.
High viscosity fluid. Reduce viscosity; adjust intake spacers.
Open or worn piston valve or packings. Clear piston valve; replace packings.
Open or worn intake valve. Clear or service intake valve.
Runs sluggishly. Possible icing. Stop pump. Open De-Ice control; see Air
Motor manual.
Cycles or fails to hold
pressure at stall. Worn check valves or seals. Service lower. See Replace the Lower , page
14, and Xtreme Lowers manual (311762).
Air bubbles in fluid. Loose suction line. Tighten. Use compatible liquid thread sealant
or PTFE tape on connections.
Poor finish or irregu-
lar spray pattern. Incorrect fluid pressure at gun. See gun manual; read fluid manufacturer’s
recommendations.
Fluid is too thin or too thick. Adjust fluid viscosity; read fluid manufac-
turer’s recommendations.
Dirty, worn, or damaged spray gun. Service spray gun. See spray gun manual.