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WATER TRUCK TROUBLESHOOTING
PROBLEM CAUSES SOLUTIONS
HYDRAULICS
The seal on the hydraulic motor
driving the water pump is leaking.
The case drain is not connected,
or is not correctly installed to
the hydraulic tank, causing back
pressure in the motor.
Verify the case drain is connected to the case drain port
on the back of the hydraulic motor. Verify the case drain
goes directly into the hydraulic tank as close as possible to
the tank if using a tee.
The case drain is installed going
into the return line of the motor.
Relocate the case drain, so it drains directly into the hy-
draulic tank.
The case drain hose is too
small.
The case drain from the motor uses # 8 hose. If multiple
hydraulic lines are used to return to the hydraulic tank, in-
crease the case drain hose to size # 12 and drain directly
into the hydraulic tank.
The hydraulic motor is defective. Replace the hydraulic motor.
WATER CANNON
The water cannon
buttery valve is not
closing all the way.
The buttery valve may have a
bent shaft from the valve being
opened when it was frozen shut.
Check the buttery valve for a bent shaft or arm and
replace as needed. To prevent this from happening in the
future, open the buttery valve with the water pump off
in cold weather to allow the water to drain from the water
cannon.
Install a recirculating line from the water cannon base
back into the tank to help keep the water moving in the
pipes, reducing the chance of freezing.
The buttery valve is not opening/
closing.
The solenoid or coil is
malfunctioning.
Check fuse, repair wiring and replace the fuse.
Check the wire connectors for a broken or loose connec-
tion. Give a light tug on each wire in the plug to verify it is
seated correctly. Repair as needed.
Check to see if the solenoid has magnetism by placing a
screwdriver across the top of the solenoid. If the solenoid
has magnetism but the solenoid valve is not activating,
the solenoid may be bad. If the solenoid has no magne-
tism, check the coil for resistance. If there is no resis-
tance, replace the bad coil.
A broken weld on the valve’s
pivoting arm.
Repair or replace as needed.
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TROUBLESHOOTING
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