Table of Contents
Advertisement
PROBLEM
The pump output is low on
the upstroke.
the upstroke
The pump output is low on
the downstroke or on both of
the downstroke or on both of
the strokes.
The paint leaks into the wet-
cup.
The fluid delivery is low.
Fluid is spitting from the gun.
The pump is difficult to prime.
Troubleshooting
CAUSE
The inlet screen (31) is clogged.
The piston ball (25) is not seating.
The piston packings are worn or damaged.
The o-ring (17) in the displacement pump is
worn or damaged.
The strainer (31) is clogged.
The piston packings are worn or damaged.
The intake valve ball is not seating
properly.
The engine speed is too low.
The clutch is worn or damaged.
The wetcup is loose.
The throat packings are worn or damaged.
The displacement rod is worn or damaged.
The inlet screen is clogged.
The pressure setting is too low.
The engine speed is too low.
The fluid filter (51), the tip filter or the tip is
clogged or dirty.
There is a large pressure drop in the hose with
heavy materials.
There is air in the pump or the hose.
The tip is partially clogged.
The fluid supply is low or empty.
There is air in the pump or the hose.
The intake valve is leaking.
The pump packings are worn.
The paint is too thick.
The engine speed is too high.
SOLUTION
Clean the screen.
Service the piston ball. See manual 307–806.
Replace the packings. See manual 307–806.
Replace the o-ring. See manual 307–806.
Clean the screen.
Replace the packings. See manual 307–806.
Clean the intake valve. See manual 307–806.
Increase the throttle setting. See Step 11,
page 9.
Replace the clutch. See page 19.
Tighten the wetcup just enough to stop leak-
age.
Replace the packings. See manual 307–806.
Replace the rod. See manual 307–806.
Clean the inlet screen.
Increase the pressure. See Step 11, page 9.
Increase the throttle setting. See Step 11,
page 9.
Clean the filter. See page 12. Or, see the gun
instruction manual.
Use a larger diameter hose and/or reduce the
overall length of hose. Use of more than 100 ft
of 1/4 in. hose significantly reduces the perfor-
mance of the sprayer. Use 3/8 in. hose for opti-
mum performance (50 ft minimum).
Check and tighten all the fluid connections.
Reprime the pump. See page 9.
Clear the tip. See the gun instruction manual.
Refill the fluid supply. Prime the pump. See
page 8. Check the fluid supply often to pre-
vent running the pump dry.
Check and tighten all the fluid connections.
Reduce the engine speed and cycle the pump
as slowly as possible during priming.
Clean the intake valve. Be sure ball seat is not
nicked or worn and that the ball seats well.
Reassemble the valve.
Replace the pump packings. See manual
307–806.
Thin the paint according to the supplier's
recommendations.
Decrease the throttle setting before priming the
pump. See Step 11, page 9.
Advertisement
Table of Contents
