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Detailed Troubleshooting - Pressure Problems
Use the charts in this section for specific diagnosis of sprayer problems. When troubleshooting, try the
solutions in the order presented. If the first step does not solve the problem, continue until the problem
is solved. If none of the steps solve the problem, call your dealer for help.
Problem
1. No Pressure Reading
on agitation gauge after
starting engine.
2. Pump is primed, but
very low pressure regis-
ters at agitation or con-
trol box gauge
3. Pressure gauge on con-
trol box fluctuates while
spraying.
Solution
a. Make sure there is fluid in the tanks (Yes, it has happened!)
b. Make sure that agitation valve, manual pressure control valve,
pump suction valve and bypass valve are open.
c. On electric clutch units, check drive belt. Tighten if necessary.
d. On PTO drive units, check coupler between engine and pump.
Tighten if necessary.
e. Make sure that gauge cleanout, air cleanout valve, filter drain valve
and tank drain valve are closed.
f. Check for obstructions in bottom of tank and in suction hose and
fittings.
g. Tighten all ball valves, hose clamps and fittings on suction side of
pump to stop any air leaks that prevent pump from priming.
h. Check for collapsed suction hose.
i. If unit is equipped with an electric clutch, check for power to clutch.
j. On hydraulic units, make sure vehicle’s hydraulic PTO is engaged.
k. Hydraulic lines may be disconnected or connected backwards.
a. Clean filter.
b. If filter is clean, check for chemical buildup under rubber diaphragm
in gauge protector or at gauge inlet hole if diaphragm is broken.
Replace diaphragm is broken, clean hose leading to agitation
gauge if necessary.
c. With pump operating, clean hose leading to control box gauge by
using ball valve located on remote magnet mount.
d. Check for cracked pump suction housing and volute housing. Re-
place if necessary.
a. Pump could be losing prime. Tighten all hose clamps, fittings and
valves on suction side of pump.
b. Check that the air clean out valve is closed.
c. With pump operating, clean hose leading to control box gauge by
using ball valve located on remote magnet mount.
d. If fluctuation occurs only when tank level is low, problem could by
caused by vigorous agitation or whirlpools in tank. Turn agitation
head so jets are aimed toward corners of tank.
e. To empty tank completely while spraying, turn off agitation ball
valve while spraying the last few gallons.
f. Fluctuations in engine speed will cause pressure to change. Make
sure that engine speed is constant.
g. If a filter is installed on suction side of pump, clean this filter.
h. Check for foreign matter blocking the tank or floating inside of pump
suction line.
i. On hydraulic drive units, check hydraulic fluid level. Add fluid if
needed.
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