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Spray Pattern Adjustment
311320H 15
tern opens as adjustment is made (FIG.
12).
FIG. 12: Opening Spray Pattern
5. Fine tune spray pattern:
a. After you back out adjustment screw,
make fine adjustments (1/8 turns or less
in either direction as required) to obtain
pattern shown in FIG. 13. Moving the
screw out beyond this point may cause
the pattern to split, as shown in FIG. 14.
FIG. 13: Desired Pattern
F
IG. 14: Split Pattern
b. If full-round pattern cannot be achieved,
ensure that material temperature and
spray pressure are correct. If pattern
remains closed upon reaching maxi-
mum specified number of turns out from
point of valving, material temperature is
too low
c. If pattern splits or has hollow center,
even with the adjustment screw at mini-
mum number of turns from point of valv-
ing, material temperature is too high.
Refer to FIG. 12.
d. After reaching satisfactory spray pat-
tern, note temperatures at proportioner
and hose, and position of notch on the
adjustment screw. As spraying pro-
ceeds, pattern may occasionally streak
or change. If this happens, inspect
chamber tip and remove any build-up of
solid foam with wooden stick or brass
wire brush.