97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06
13
PRESSURE
W
ASHER
OPERA
TOR’S MANU
AL
MaintEnancE
WARNING: Unauthorized machine modification or
use of non-approved replacement parts may cause
personal injury and/or property damage and will void
the manufacturer warranty.
pump
Lubrication:
To lubricate pump, use 30W non-detergent
oil for pump crankcase. Crankcase must be filled to center
of red dot on oil gauge found on the end of the pump, refer
to
figure 7
. During the break-in-period, make sure the
oil is changed after the first 40 hours of operation. After
that, replace oil every 3 months or 500 hours of operation,
whichever comes first.
proper pump care:
DO nOt
pump acids.
DO nOt
allow pump to run dry.
Winterize if storing in freezing temperatures, refer
to
Storage
for details.
Use a water softener on the water system if known
to be high in mineral content.
Use only high quality detergents and follow manu-
facturer's mix recommendations.
Flush the system with clear water immediately
after using detergent solutions.
Clean filter screen on detergent inlet line
periodically.
Flush the pressure washer system with antifreeze
if storing for an extended period of time, refer to
Storage
for details.
gasoline Engine
Refer to the provided
gasoline Engine Manual
for
recommended maintenance.
relief valve
WARNING: The relief valve on this pressure washer
has been factory set and sealed and is a field nonad-
justable part. Tampering with the factory setting may
cause personal injury and/or property damage, and
will void the manufacturer warranty.
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.
burner fuel filter
Drain any water which has accumulated in fuel filter
and clean or replace filter element as needed.
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 oil 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.
hour Meter
This hour meter will monitor the total hours of operation of
the pressure washer to signal when routine maintenance
is required.
Figure 7 - Pump Lubrication
Oil fill/Dipstick
Oil Drain plug
Oil gauge
Summary of Contents for 781SS
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