Troubleshooting Guide - Graco GM3500 SPRAYER 231-078 Instructions And Parts List

TROUBLESHOOTING GUIDE
PROBLEM
Displacement . pump outpu
low on upstroke
low on downstroke or bot1
Displacement pump outpu
strokes
Paint leaks into wetcup
Low fluid delivery
Spitting from gun
CAUSE
Pump inlet screen clogged
Piston ball check not seating
Piston packings worn or damaged
Displacement pump sleeve gasket
worn or damaged
Pump inlet screen clogged
Piston packings worn or damaged
properly
Intake valve ball check not seating
Engine RPM too low
~~~ ~
Clutch worn or damaged
Loose wet-cup
Throat packings worn or damaged
damaged
Displacement rod worn or
Pump inlet screen clogged
Pressure setting too low
Engine RPM too low
Dirty outlet filter, tip filter or tip
Large pressure drop in hose
Air in fluid pump or hose
Tip partially clogged
Fluid supply is low or empty
SOLUTION
Clean.
Service piston ball check.
Replace packings,
Replace.
Clean.
Replace packings.
Clean and service.
Increase throttle setting. See Startup,
Step 17, page 8.
Replace. See page 24.
Tighten just enough to stop leakage.
Replace packings. See 307-793.
Replace. See 307-793.
Clean.
Increase pressure. See Startup, Step
17, page
8.
Increase throttle setting. See Startup,
Step 17, page 8.
Clean.
Use larger diameter hose.
Check for loose connections at intake
and tiohten. Then mime the
ix.mD.
See STaiup, page
8 :
Clear,
Refill and reprime the pump. See
Startup, page
8.
Check fluid supply
often to Drevent running dry.
, .
14
307-893