The FUEL PUMP, on diesel heated
units, is a self-priming, low volume pump
which is propelled by the burner motor.
The fuel pump pressure is typically set
at 125psi but can be turned as high as
160psi during the winter when the
incoming water temperature is lower. Before adjusting
the fuel pressure, connect a fuel pressure gauge and
an outlet water temperature gauge, turn the pump and
burner on, and turn the fuel pressure screw clockwise
until the desired water temperature is obtained. Air
band adjustment may be needed to maintain a clean
burn. Be sure not to exceed the recommended
specifications of the machine.
The FUEL FILTER will need to be replaced often if the
diesel fuel quality is poor. A fuel filter with a water
separator is recommended if the fuel quality is
consistently poor.
The FUEL SOLENOID is an electric fuel valve that
shuts off the fuel whenever the trigger on the spray gun
is released or if the set temperature on the heat switch
is exceeded.
Warning! When performing any tests on ignition
systems, do not touch the ignition rod. Ignition
circuit generates over 10,000 volts, electrical shock
can result!
The IGNITION TRANSFORMER provides a high
voltage spark that travels down the electrodes to ignite
the diesel fuel. Disconnect all power before servicing.
The 12V burner operates from the battery on some skid
pressure washers. The engine has a 10 to 25 amp
charging system that keeps the battery charged which
runs the burner. The transformer stops when the
trigger gun is released and is controlled through a high
amperage contactor. To help keep the battery fully
charged, and for safely cooling down the burner, turn
off the burner during the last minute of rinsing. When
leaving the machine unattended, shut off burner and
engine switch. Replace 12 VDC battery regularly (2
year maximum interval) on 12V burner systems to help
ensure consistent performance.
PRESSURE DELIVERY SYSTEM:
DISCHARGE HOSE: Use only a wire braid hose rated
for the output pressure and temperature of the
machine. Additional hose lengths can be added with
quick twist couplers with a minimal loss in pressure of
about .5 PSI per foot. Inspect hoses for wear and
replace if necessary. Avoid kinking or running over the
hose to extend the hose life.
WARNING: Hydro Tek hot water machines require
a special 250° rated hose. If the hose is not
replaced when worn it may burst and serious injury
and burns could result.
QUICK COUPLERS: The swivel
connectors on the high-pressure hose
and quick couplers on the spray nozzle
make it easy to change nozzles or hoses. When
connecting hoses or nozzles, be certain that the collar
on the quick couplers snap into the locked position to
prevent them from becoming loose. If the quick
connect begins to leak, replace the O-ring (specify
Viton or EDPM material) located in the female socket
coupler. Grease the coupler periodically to make it
work smoothly. Replace if it becomes worn. Twist
couplers are also used on most wands so they can be
interchanged.
TRIGGER GUNS: The trigger gun is merely a valve
that turns water spray on and off. If it begins to leak or
fails to shut off, replace or repair the valve assembly.
Machines that spray steam only are equipped with an
open gun that does not shut off the water spray.
SPRAY WAND: Spray wands are available in different
lengths (2 to 6 foot) and with variable pressure
adjustment for various cleaning applications. The dual
wand has a low-pressure and high-pressure nozzle.
When the dual wand is installed on the machine, the
output pressure can be lowered simply by turning the
valve on the dual wand to divert water into the low-
pressure nozzle. This lowers the pressure (psi) but has
little or no impact on the flow (gpm) or outlet water
temperature on hot water machines.
The short wands are ideal for washing in confined areas
such as a car lot. The longer wands help to clean areas
that could not normally be reached.
WARNING wands less than 48” long should not be
used with machines producing over 3200psi.
NOZZLES: The spray nozzle is a
precisely machined orifice made
of hardened stainless steel. The
orifice size is matched to the
output of your machine to attain
the proper flow and pressure in which your machine
was designed. The orifice, or hole, of the nozzle will
enlarge with wear. For optimum performance, replace
the spray nozzle to maintain the full output pressure of
your machine. The nozzle installed on your machine
from the manufacturer is designed to allow only about
90% of the water being pumped to discharge out of the
nozzle. The remaining 10% is bypassed back into the
inlet water supply by the unloader/regulator valve. If an
incorrect nozzle size is used, the maximum flow and
pressure of the machine cannot be achieved and the
unloader valve can wear prematurely. When replacing
SYSTEM INFORMATION – ACCESSORIES 13
Never lock any gun in the on position for any
reason. Never point spray at a person or any part
of the body.
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