Landa SEHW6-3500, Operator'S Manual, Page: 16 / 38

LANDA SEHW • 8.913-932.0 • Rev. 02/12a
OPERA
TOR’S MANU
AL
PRESSURE
W
ASHER
16
PREVENTATIVE MAINTENANCE
1. Use clean fuel — kerosene, No. 1 home heating
fuel, or diesel. Clean or replace fuel filter every 100
hours of operation. Avoid water contaminated fuel
as it will cause the fuel pump to seize. De-soot coils
monthly or use an additive if diesel is being used.
2. Check to see that water pump is properly lubricated
(see pump lubrication below).
3. Follow winterizing procedures to prevent freeze
damage to pump and coils.
4. Always flush detergent from system after use.
5. If water is known to be high in mineral content,
use a water softener on your water system or use
a Landa recognized coil cleaning detergent.
6. Do not allow acidic, caustic or abrasive fluids to be
pumped through system.
7. Always use high grade quality Landa cleaning
detergents.
8. Never run pump dry for extended periods of time.
9. Periodically delime coils as per instructions.
10. If machine is operated with smoky or eye-burning
exhaust, coils will soot up, preventing water from
reaching maximum operating temperature. (See
section on Burner Adjustments).
MAINTENANCE & SERVICE
Pump Lubrication:
Use only SAE 30 weight non-detergent oil. Change oil
after first 50 hours of use. Thereafter, change oil every
three months or at 500 hour intervals. Oil level should
be checked through use of dipstick found on top of
pump or red dot visible through oil gauge window. Oil
should be maintained at that level.
Fuel:
Use clean fuel oil that is not contaminated with water
and debris. Use kerosene, No. 1 home heating fuel or
diesel. Drain fuel tank and replace fuel filter every 100
hours of operation.
Ignition Circuit:
Periodically inspect wires, spring contact and elec-
trodes for condition, security and proper spacing.
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 illustration.)
TRANSFORMER CHECK
ELECTRODE SETTING: WAYNE
ELECTRODE SETTING: BECKETT
Fuel Control System:
These machines utilize a fuel solenoid valve located on
the fuel pump to control the flow of fuel to the combus-
tion chamber. This solenoid valve, which is normally
closed, is activated by a flow switch when water is flow-
ing through it. When an operator releases the trigger on
the spray gun, the flow of water through the flow switch
stops, turning off the current to 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 allows for an instantaneous burn or no burn
situation, thereby eliminating high and low water tem-
peratures, and combustion smoke normally associated
with machines incorporating a spray gun.
Gap
1/8"
3/8"
3/16"
1/8"
1/2"
Electrodes
Nozzle
Adapter
2-7/8"
Top View Side View
Periodically Check Wiring Connections.
If Necessary To Adjust Electrodes, Use Diagram
5/32" Gap
1/16"
Nozzle
Electrode
7/16"