PROBLEM
CAUSE
SOLUTION
Displacement pump output low on
downstroke or both strokes
Pump inlet screen clogged
Clean screen.
Pressure setting too low
Increase pressure. See
Startup
,
Step 14, page 14.
Dirty outlet filter, tip filter or tip
Clean filters and/or tips.
Piston packings worn or damaged
Replace packings. See page 26.
Intake valve ball check not seating
properly
Clean and service intake valve. See page 26.
Engine RPM too low
Increase throttle setting. See
Startup
,
Steps 5b and 14, page 14.
Clutch worn or damaged
Replace clutch. See page 34.
Partially clogged suction tube assembly
Remove and clean suction tube. During normal
flushing remove and clean the suction tube as-
sembly separately to prevent further clogging.
Large pressure drop in hose
Use larger diameter hose.
Paint leaks into wet–cup
Loose wet–cup
Tighten wet–cup just enough to stop leakage.
Throat packings worn or damaged
Replace packings. See page 26.
Displacement rod worn or damaged
Replace displacement rod. See page 26.
Spitting from gun
Air in fluid pump or hose
Check for loose connections at pump intake and
tighten. Them prime the pump.
See
Startup
, page 14.
Tip partially clogged
Clear tip clog. See page 16.
Fluid supply is low or empty
Refill and prime the pump. See
Startup
, page 14.
Check fluid supply often to prevent running the
pump dry.
Dried paint particles from a poorly cleaned
suction tube assembly
Remove and clean suction tube. During normal
flushing remove and clean the suction tube as-
sembly separately to prevent further clogging.
