ground logic Pathfinder - 8.3 Spraying System Issues

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8. FAULT ISOLATION CONTINUED
8.3 SPRAYING SYSTEM OPERATES INCORRECTLY
FAILURE MODE CAUSE OF PROBLEM CORRECTIVE ACTION
Spraying pattern is
uneven or spraying
system does not op-
erate.
The spray nozzle tips are out of
position.
Rotate the spray nozzle tips so that the tip ori-
ce is directed straight in front of the machine.
Verify that the lower nozzle (trim nozzle) is posi-
tioned approximately 30 degrees and the upper
nozzle (broadcast nozzle) is positioned straight
up and down.
The spray nozzles are out of
position.
The spray valve is not in the cor-
rect position.
Verify that the spray valve is in the horizontal
position when spraying. The valve lever can be
moved either forward or backward to the hori-
zontal position to operate. The valve is “OFF” in
the vertical position.
The pressure relief valve is set
incorrectly.
Verify that the pressure gauge reads approxi-
mately 25 psi at full engine speed. Adjust the
pressure relief knob in or out to obtain this
pressure. Tighten the locking nut against the
pressure relief knob.
The strainer or tip is clogged. Remove the spray nozzle tip and inspect the tip
orice and the strainer to make sure they are
not clogged. Clean or replace these compo-
nents as necessary.
The lter is clogged. Remove the sediment bowl from the lter
housing and inspect the lter screen. Clean or
replace the screen as necessary.
The spray pattern knob is incor-
rectly set.
Move the spray pattern knob all the way to side
of the desired pattern setting.
The spray tank volume is low. Rell the spray tank. Note that in very rough
or hilly conditions, the liquid in the spray tank
may slosh around and the tank discharge tube
may starve when the tank level is low. This can
cause poor spraying performance.
The engine speed is too low. Operate the machine at full engine speed. The
spray system is designed to operate most ef-
ciently at full engine speed.
The pump is worn or damaged. Loosen the suction tting on the pump to verify
that there is liquid ow to the pump. Tighten the
suction tting and loosen the discharge tting
to verify that the pump is operating correctly. If
there is no ow, replace the pump.
The pump input shaft is not spin-
ning.
Verify that all of the belts are in good condition
and are tensioned properly. Verify that the pump
pulley is securely fastened to the pump shaft
with a setscrew.