GROUND FORCE 717H01, Operation & Maintenance Manual, Page: 47 / 57

WWW.GFWORLDWIDE.COM | +1 (208) 664-9291
WATER TRUCK TROUBLESHOOTING
PROBLEM CAUSES SOLUTIONS
SPRAY HEADS
Spra
y head(s) are no
t turning on.
The spray head is not selected
on the Water Control System.
Select the desired spray head on the Water Control Sys-
tem display. See Water Control System Instructions.
A fuse is blown. Find the cause for the fuse blowing and repair. Replace
fuse.
No conductivity going to the
solenoid.
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 the wiring for breaks and shorts. Repair as needed.
The solenoid or coil is bad. 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 magnetism
check the coil for resistance if no resistance replace the
bad coil.
The water pump is not creating
enough pressure to open the
spray head.
See the HYDRAULICS section of this guide to diagnose the
problem.
The diaphragm on the spray
valve is leaking water into
the valve cavity, keeping the
diaphragm from opening.
To check, open the port on the front spray head cover
below cylinder if water leaks out it indicates the valve's
diaphragm is cracked. Replace the diaphragm in the spray
head valve.
The hydraulic cylinder seal is
leaking and filling the valve
cavity with hydraulic fluid,
keeping the diaphragm from
opening.
Open the port on the spray valve cover below the cylinder.
If hydraulic fluid leaks out, it indicates the seal on the
cylinder is leaking. Check hydraulic pressure going to the
cylinder before replacing the cylinder and adjust the pres-
sure as needed. Seals are rated at 500 PSI. Replace the
hydraulic cylinder if necessary.
HYDRAULICS
The pum
p and mo
tor are
turning but the pum
p is no
t
pum
ping.
The direction of the motor
is reversed and the pump is
turning in the wrong direction.
Verify the pump is turning the correct direction. The rota-
tion should be as follows: The impeller shaft should rotate
in the direction from the smaller part of the water pump
volute housing towards the larger part of the volute, where
the water exits. If the rotation is incorrect, switch the
rotation of the hydraulic motor. The motor rotation can be
changed by disconnecting the hydraulic lines, unbolting
the hydraulic motor from the mount, rotating the motor
180 degrees, then reinstalling the motor to the mount and
reconnecting the hydraulic lines.
47
TROUBLESHOOTING