97-6331 • HOTSY 558-559 • REV. 4/06
11
PRESSURE WASHER
OPERATOR’S MANUAL
Pump Motor
On a yearly basis, oil pump motor per instructions on
motor nameplate.
NOTE: Some motors may be equipped with perma-
nently lubricated bearings and will not require ad-
ditional lubrication.
Gas Burner
It is recommended that the gas burner be serviced
yearly or as needed. Contact your local service center.
Relief Valve
WARNING: The relief valve on this pressure washer
has been factory set and sealed and is a field non-
adjustable part. Tampering with the factory setting
may cause personal injury and/or property damage,
and will void the manufacturer warranty. For re-
placement parts refer to Figure 16.
Unloader Valve
WARNING: The unloader valve on this pressure
washer has been factory set and sealed and is a
field nonadjustable part. Tampering with the factory
setting may cause personal injury and/or property
damage, and will void the manufacturer warranty.
For replacement parts refer to Figure 17.
Heating Coil:
Coil Descaling: In hard water areas, scale buildup
within the heating coil will occur. Scale deposits will
decrease the water temperature rise and may eventually
clog the heating coil. Contact your local service center
when descaling is needed.
Coil Desooting: Poor grades of fuel or inadequate
combustion air will cause heavy soot buildup on the
outside surface of the heating coil. These deposits will
insulate the coil. This will restrict the air flow through
the coil, further aggravating the soot buildup. Contact
your local service center when desooting is needed.
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