CONDITION POSSIBLE CAUSES SOLUTION
1 Application Rate Units (GPA, G/1000 ft
2
A Continuous discrepancy of 10% or more Check all components and programming
or l/Ha) continually flash on/off. between Target Application Rate and steps related to flow
Actual Application Rate.
PROGRAMMING
B Flow meter pulses In the System Setup mode, move to the flow meter
Pulses section on page 18 of the 844 Installation
Manual. Enter the factory calibrated flow meter pulse
rate located on the tag accompanying the flow meter.
C Nozzle Selection In the Application Setup mode, move to the Nozzle
Selection section on page 24 of the 844 Installation
Manual. Enter the correct color or the flow rate in US
GPM (l/min) {Imp. GPM} of the tips you are using at
40 psi (2 bar). For new tips, this can be found in your
TeeJet
®
Catalog.
If the tips have been used and possibly worn,
measure the flow in US Gallons Per Minute
(Liters Per Minute) {Imperial Gallons Per Minute)
at 40 psi (2 bar) and enter the value in the User
Programmable tip programming step which can be
found in the System Setup Mode on page 16 of the
844 Installation Manual.
D Number of spray tips per boom section. In the System Setup mode, move to the Tips Per
Boom Section step on page 16 of the 844 Installation
Manual. You must enter the correct number of spray
tips for each boom section on your sprayer. Five
boom sections are possible. If you do not use all
boom section switches, make sure those not used
are set to “0”. Make sure that the switch numbers
being used correspond with the section numbers
programmed.
2 Application Rate Units continually A Continuous discrepancy of 10% or more Check all components and programming steps
flash on/off. between Target Application Rate and related to flow.
Actual Application Rate.
MECHANICAL
B Stalled flow meter. Make sure there is no pressure in the system.
Remove the flow meter from the discharge line.
Inspect the inside of the meter for obstructions. The
turbine should move freely. If it does not rotate easily,
try flushing it out with clean water. If it remains stuck,
remove the turbine by releasing the retaining clip.
Clean the turbine carefully and make sure it rotates.
Replace the turbine into the flow meter body and
secure with the retaining clip.
If you have a rapid check flow meter, remove the
turbine from the flow meter body by unthreading it at
the sensor. Check the turbine for obstructions. Flush
with clean water or disassemble if necessary.
C Plugged Tips In the event of plugged nozzles, remove from boom
and clean with water and a TeeJet brush. Take care
not to damage the orifice.
D Wrong capacity tips All tips on the boom should be of the same style,
spray angle and capacity (Flow Rate). Replace any
tips not matching those initially selected.
Troubleshooting Guide
32
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