Manual Karcher STP 9.801-191.0 - B
OPERA
TOR’S MANU
AL
PRESSURE
W
ASHER
10
PREVENTATIVE MAINTENANCE AND SERVICE
1. Remove the tank head assembly by lifting the tank
head off.
2. Remove the two pipe nipples and associated fit-
tings.
3. Lift the coil out of the outer wrap.
CAUTION: the coil weighs about 80 lbs. Use proper
lifting techniques.
4. Clean, repair and replace the coil by reversing the
above steps.
Coil Reinstallation
Reinstall by reversing the above steps 4 through 1.
Fuel:
Use clean fuel oil that is not contaminated with water
and debris. Replace fuel filter and drain tank every 100
hours of operation. Use Kerosene No. 1 or No. 2 Heating
Fuel (ASTM D306) or diesel only.
NEVER
use gasoline
in your burner tank. Gasoline is more combustible than
fuel oil and could result in a serious explosion.
NEVER
use crankcase or waste oil in your burner. Fuel unit
malfunction could result from contamination.
Ignition Circuit:
Periodically inspect wires, spring contact and elec-
trodes for condition, security and proper spacing.
For
transformer test (CAUTION 10,000 VOLTS)
use defect
free insulated screwdriver and keep fingers off blade!
Lay blade across one contact: OK if arc will span 1/2"
between end of blade and other contact (see following
illustration).
Electrode Setting: Beckett
Burner Nozzle:
Keep the tip free of surface deposits by wiping it with a
clean, solvent-saturated cloth, being careful not to plug
or enlarge the nozzle. For maximum efficiency, replace
the nozzle each season.
Fuel Control System:
The pressure washer utilizes a fuel solenoid valve
located on the fuel pump to control flow of fuel to the
combustion chamber. This solenoid is activated by a
pressure switch located on the unloader valve. When
an operator releases the trigger on the spray gun, the
pressure drops, allowing the pressure switch to activate
the fuel solenoid. The solenoid then closes, shutting off
the supply of fuel to the combustion chamber. Controlling
the flow of fuel in this way gives an instantaneous burn
or no burn situation, thereby eliminating high and low
water temperatures, and combustion smoke normally
associated with machines incorporating a spray gun.
Periodic inspection is recommended to insure that the
fuel solenoid valve functions properly. This can be done
by operating the machine and checking to see that when
the trigger on the spray gun is in the off position, the
burner is not firing.
Fuel Pressure Adjustment:
To adjust fuel pressure, turn the adjusting screw with a
screwdriver (located on the fuel pump) clockwise to
increase, counterclockwise to decrease. Do not exceed
200 PSI.
Wayne Burner Air Adjustment
Machines are preset and performance tested at the
factory — elevation 100' above sea level. A one time
correction for your location will pay off in economy,
performance and extended service life. If a smoky or
eye-burning exhaust is being emitted from the stack,
two things should be checked.
First, check the fuel to be certain that kerosene or No.
1 home heating fuel is being used.
Next, check the air adjustment on the burner. An oily,
black, smoky fire indicates a lack of air and the air band
should be moved to allow the air to flow through the
burner. Sharp, eye-burning fumes indicate too much
air flowing through the combustion chamber. The air
band should be moved to allow less air to flow through
the burner.
To adjust:
Start the machine and turn burner ON.
Loosen the locking screws found in the air band open-
ings (refer to illustration) and close air band until black
smoke appears from burner exhaust vent. Next slowly
open the air band until white smoke just starts to appear.
Turn air band halfway back to the black smoke position
previously noted. Tighten the locking screws.
Side View
Top View
Nozzle
Electrode
1/8" min
5/32" max Gap
1/4" Above
nozzle center
1/8" AC- 3/16"
DC nozzle-to-tip
spacing
