620-622 • 9.800-187.0 • Rev. 9/10
OPERATOR’S MANUAL
PRESSURE WASHER
8
2. Turn the thermostat knob to 270°. (The thermo-
stat is a high limit device and does not regulate
temperature.)
3. To stop, reverse steps 1 to 3 and set all controls
to their original settings.
4. Turn burner switch off, open trigger on spray
gun and allow water to cool.
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 contaminat-
ed 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
de-scale as needed.
6. Do not allow acidic, caustic or abrasive fluids to
be pumped through system.
7. Always use a high grade quality cleaning
detergents.
8. Never run pump dry for extended periods of
time.
9. Periodically delime coils per instructions.
1 0. If machine is operated with smoky or eye-burn-
ing exhaust, coils will soot up, preventing water
from reaching maximum operating temperature.
(See section on Burner Adjustments).
MAINTENANCE AND 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
GENERAL CLEANING TECHNIQUES
Periodically Check Wiring Connections. If Nec-
essary To Adjust Electrodes, Use Diagram
Nozzle
Electrode
5/32
1/4
5/32
