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30839814
PROBLEM CAUSE SOLUTION
The pump output is low on
the u
p
stroke
The inlet screen (31 or 23a) is clogged. Clean the screen.
th
e ups
t
ro
k
e.
The piston ball (425) is not seating. Service the piston ball–check. See manual
307806.
The piston packings are worn or damaged. Replace the packings. See manual 307806.
The gasket (417) in the displacement pump is
worn or damaged.
Replace the gasket. See manual 307806.
The pump output is low on
the downstroke or on both of
The inlet screen (31 or 23a) is clogged. Clean the screen.
th
e
d
owns
t
ro
k
e or on
b
o
th
o
f
the strokes. The piston packings are worn or damaged. Replace the packings. See manual 307806.
The intake valve ball is not seating
properly.
Clean the intake valve. See manual 307806.
The engine speed is too low. Increase the throttle setting. See Step 11,
page 9.
The clutch is worn or damaged. Replace the clutch. See page 20.
The paint leaks into the wet-
cup.
The wetcup is loose. Tighten the wetcup just enough to stop leak-
age.
The throat packings are worn or damaged. Replace the packings. See manual 307806.
The displacement rod is worn or damaged. Replace the rod. See manual 307806.
The fluid delivery is low.
The inlet screen is clogged. Clean the inlet screen.
The pressure setting is too low. Increase the pressure. See Step 11, page 9.
The engine speed is too low. Increase the throttle setting. See Step 11,
page 9.
The fluid filter (51), the tip filter or the tip is
clogged or dirty.
Clean the filter. See page 12. Or, see the gun
instruction manual.
There is a large pressure drop in the hose with
heavy materials.
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).
Fluid is spitting from the gun.
There is air in the pump or the hose. Check and tighten all the fluid connections.
Reprime the pump. See page 13.
The tip is partially clogged. Clear the tip. See the gun instruction manual.
The fluid supply is low or empty. Refill the fluid supply. Prime the pump. See
page 8. Check the fluid supply often to pre-
vent running the pump dry.
The pump is difficult to prime.
There is air in the pump or the hose. Check and tighten all the fluid connections.
Reduce the engine speed and cycle the pump
as slowly as possible during priming.
The intake valve is leaking. Clean the intake valve. Be sure ball seat is not
nicked or worn and that the ball seats well.
Reassemble the valve.
The pump packings are worn. Replace the pump packings. See manual
307806.
The paint is too thick. Thin the paint according to the supplier’s
recommendations.
The engine speed is too high. Decrease the throttle setting before priming the
pump. See Step 11, page 9.