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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 side of the
pump, refer to Figure 8. 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.
OIL FILL/DIPSTICK
OIL DRAIN
PLUG
Figure 8 - Pump Lubrication
Proper Pump Care:
• DO NOT pump acids.
• DO NOT allow pump to run dry.
• Winterize if storing in freezing temperatures, re-
fer 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.
Hotsy 781SS, 871SS, 921SS • 97-6642 • Rev. 9/04
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 non-
adjustable part. Tampering with the factory setting
may cause personal injury and/or property damage,
and will void the manufacturer warranty. For replace-
ment parts refer to Figure 18.
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 set-
ting may cause personal injury and/or property dam-
age, and will void the manufacturer warranty. For
replacement refer to Figures 12-14.
Burner Fuel Filter
Drain any water which has accumulated in fuel filter
and clean or replace filter element as needed. Refer to
Figure 10.
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.
OIL GAUGE
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.
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