Graco Roof Rigs 224483 Instructions-Parts List Manual page 17

PROBLEM
Engine starts but dies
Displacement pump output low
on upstroke
Displacement pump output low
on downstroke or both strokes
Coating leaks into wet–cup
Low fluid delivery
Spitting from gun
CAUSE
Oil level drops below oil sensor
Siphon hose strainer is clogged
Piston ball check not seating
Piston packings worn or damaged
Sleeve o–ring in displacement pump
worn or damaged
Siphon hose strainer is clogged
Piston packings worn or damaged
Intake valve ball check not seating
properly
Clutch worn or damaged
Loose wet–cup
Throat packings worn or damaged
Displacement rod worn or damaged
Siphon hose strainer is clogged.
Pressure setting too low
Engine RPM too low
Large pressure drop in hose
Air in fluid pump or hose
Fluid supply is low or empty
SOLUTION
Add oil.
Clean strainer.
Service piston ball check. See page 19.
Replace packings. See page 19.
Replace o–ring gasket. See page 19.
Clean strainer.
Replace packings. See page 19.
Clean and service intake valve. See page
19.
Replace clutch. See page 26.
Tighten wet–cup just enough to stop
leakage.
Replace packings. See page 19.
Replace displacement rod. See page 19.
Clean strainer.
Increase pressure. See Startup,
Step 9, page 11.
Increase throttle setting. See Startup,
Steps 4b and 9, pages 10 and 11.
Use larger diameter hose.
Change gasket in siphon hose quick discon-
nect coupling, if worn or missing. Replace
pump cylinder o–ring. Then prime the
pump. See Startup, page 10.
Refill and prime the pump. See Startup,
page 10. Check fluid supply often to prevent
running the pump dry.