Table of Contents
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Thank you for purchasing a Hotsy Pressure Washer. This manual covers the operation and mainte-
nance of your pressure washer. All information in this manual is based on the latest product infor-
mation available at the time of printing. Hotsy, Inc. reserves the right to make changes at any time
without incurring any obligation.
Read instructions carefully before attempting to assemble, install, operate or service this pressure
washer. Failure to comply with instructions could result in personal injury and/or property damage!
®
SEriaL nuMbEr:
DatE purchaSED:
fOr SaLES anD SErvicE, pLEaSE cOntact:
MODELS 781SS,
871SS, 921SS
OPERATING INSTRUCTIONS
AND PARTS MANUAL
97-6642
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Table of Contents
Related Manuals for Hotsy 781SS
Summary of Contents for Hotsy 781SS
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Page 1: Operating Instructions
Thank you for purchasing a Hotsy Pressure Washer. This manual covers the operation and mainte- nance of your pressure washer. All information in this manual is based on the latest product infor- mation available at the time of printing. Hotsy, Inc. reserves the right to make changes at any time without incurring any obligation. - Page 2 Machine Power Rating: 9 HP Robin Subaru, Manual Start Machine Weight: 385 Lbs. Shipping Weight: 415 Lbs. Exhaust Stack Size: 8" Machine Dimensions: Length=47", Width=31", Height=49" 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06...
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Page 3: Table Of Contents
The model and serial numbers will be found on a decal attached to the pressure washer. You should record both serial number and date of purchase and keep in a safe place for future reference. 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 4: Introduction & Important Safety Information
5. Risk of explosion - do not spray flammable liquids or op- Hotsy, Inc. reserves the right to make changes at any erate in an explosive location. time without incurring any obligation. riSk Of ExpLOSiOn:... -
Page 5: Important Safety Information
13. The best insurance against an accident is pre- caution and knowledge of the machine. 14. Hotsy will not be liable for any changes made to our standard machines, or any components not purchased from Hotsy. 15. Read engine safety instructions provided. -
Page 6: Component Identification
— Safety device which, when the detergent onto cleaning surface with trigger device. Includes safety latch. spray gun closes, prevents over pressurization. Wand — Must be connected to the spray gun. 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 7: Assembly Instructions
2. Install the pressure hose on the pressure washer as shown in figure 1. rupture Disk coil Outlet pressure hose Figure 1 - Pressure Hose Installation 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 8: Installation Instructions
1 for location. Poor draft will cause the pressure washer to soot and not operate properly. When selecting the location for installation, beware of poorly ventilated locations or areas where exhaust fans may cause an 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... - Page 9 NOTE: If a flue is installed, have a professional ser- viceman adjust your burner for a #1 or #2 smoke spot on the Bacharach scale. 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06...
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Page 10: Operation Instructions
1-303-792-5200. When the trigger of the trigger gun is released or when the thermostat temperature Manual trigger Lock setting is reached, the burner will automatically turn off. Figure 4 - Nozzle Installation/Manual Trigger Lock 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 11: Storage
For the best results, 2. Completely open detergent control knob located contact your Hotsy dealer to help you select the best on the side of the detergent injector valve. Refer to detergent for your application. - Page 12 If the pressure washer is not to be used for an extended length of time, it is recommended that the system be flushed with antifreeze for rust protection. Refer to the gasoline Engine Manual for engine storage information. 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06...
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Page 13: Maintenance
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. 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 14: Troubleshooting
Fully open faucet. Check for kinked or dam- aged hose. Use 3/4 inch minimum hose. Check for debris clogging inlet screen. Trigger of trigger gun released Squeeze trigger. Water must be spraying for burner to light 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... - Page 15 If the pressure washer demonstrates other symptoms or the corrective actions listed do not correct the problem, contact the local authorized Hotsy Service Center. The Hotsy Service Center can be identified by visiting www.hotsy.com or by calling 1-800-525-1976.
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Page 16: Exploded Views
ExpLODED viEW - LEft SiDE Detail See coil Outlet assy Detail See control box illus. rectifier (reversed view) 9,14 for Detail See burner illus. 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 17: Exploded Views
ExpLODED viEW - right SiDE Detail See pump assy illus. 36, 37 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 18: Exploded View, Parts List
983013 Wheel & Tire, 6.5" Steel Rim, 12.5" Tire 817322 Cap, 5/8" Axle Hub, Black 848616 Nut, .61 ID, Push, Flat 817312 Cap, w/Fuel Gauge 661277 Standpipe 754711 Tee, 3/8" Female 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 19: Exploded View, Parts List
890873 Tab, Gas Engine 890769 Warning, Unloader 9.800-018.0 Label, Tip Over 9.800-049.0 Label, Cleaning Solution 799515 Nipple, 1/2" JIC x 3/8" Pipe (781SS, 921SS) Not Shown 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 20: Burner Assembly Parts List
875490 Filter Element 723369 Solenoid 661413 Electrodes 830492 Fuel Pump 676894 Fuel Line 783813 Motor 630730 Coupling 676640 Blower Fan Not Shown 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 21: Control Box Assembly & Parts List
Holder, Fuse 829620 Plug 358026 Clamp 612945 Bolt, 1/4-20 x 1/2" 703106 Nut, 1/4" 2-011681 Cap, Capacitor, 1.37 x 1.5 x .06 BLK, w/o Hole 860140 Relay 70-030207 Not Shown 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 22: Coil Outlet Assembly & Parts List
Bushing, 1/2" x 3/8" Steel 2-00681 844806 Nipple, 3/8" x 3/8" NPT ST Male 2-2007 898035 Hose Barb, 3/8" Barb x 3/8" ML Pipe 2-10862 646673 Label, Hot Water Outlet 10-09004 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 23: Hose &Spray Gun Assembly & Parts List
Nipple, 1/4" x 1/4" NPT ST Male 826169 Coupler, 1/4" Female, Brass 936647 Wand, SGL STR, Insulated, 48" 799091 Nozzle, SACQMEG, 0003.5, Red 799092 Nozzle, SACQMEG, 1503.5, Yellow 799093 Nozzle, SACQMEG, 4003.5, White 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 24: Vba35 Uloader Exploded View & Parts List
70-000918 Teflon Ring kit a 70-262813 O-Ring Repair Kit 70-120611 Stem kit b 70-262814 Outlet Kit 70-140702 Connector, Female kit c 70-262815 Stem Repair Kit 70-060119 O-Ring A, B 70-090004 Spring 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 25: Pump Assemblies & Parts Lists
Strainer, Chemical w/1/4" Brass Barb 823989 Clamp, Hose, UNI .40-.48ST 801126 Swivel, 3/8" MP x 3/4" GHF w/Strainer 661357 Elbow, 1/2" JIC, 3/8", 90° 6-021720 Switch, Pressure 830302 Plug, 1/4" Countersunk 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... - Page 26 935159 Strainer, Chemical w/1/4" Brass Barb 823989 Clamp, Hose, UNI .40-.48ST 801126 Swivel, 3/8" MP x 3/4" GHF w/Strainer 644802 Elbow, 3/8" Street, 90° 6-021720 Switch, Pressure 830302 Plug, 1/4" Countersunk 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06...
- Page 27 Washer, 5/16" Flat, SAE (921SS) 615532 Bolt, 8 mm x 16 mm HEX Head (921SS) 612951 Bolt, 3/8" x 1-1/4", NC HH (921SS) 936438 Washer, 3/8" x 1" Steel (921SS) 615527 Pad Soft Rubber (921SS) 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06...
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Page 28: Pump Exploded Views & Parts Lists
See Kit Below Plunger, 15mm 70-180118 Manifold Stud Bolt 70-140027 Copper Spacer 70-140001 Washer 70-060130 O-Ring Ø1.78x5.28 70-060306 Copper Washer 3/8" 70-000913 Teflon Ring 70-160117 Brass Plug 3/8" 70-000320 Plunger Rod 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... - Page 29 15mm Seal Packing 15mm Seals ITEM NUMBERS 2, 3, 4, 5, 38, 39, 40, 3, 5, 6 11, 12, 13 INCLUDED 6, 7 41, 42 NUMBER OF CYLINDERS KIT WILL SERVICE 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06...
- Page 30 O-Ring Ø2.62 x 18.77 70-160147 Valve Plug 70-020010 Needle Roller Bearing 70-060308 Washer, Copper 70-050055 Engine Flange 70-160121 Brass Plug G1/4 70-140002 Spring Washer 70-180118 Manifold Stud Bolt 70-180132 Flange Screw 70-140001 Washer 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06...
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Page 31: Pump Exploded Views & Parts Lists
15mm Seal Packing 15mm Seals ITEM NUMBERS 2, 3, 4, 5, 39, 40, 41, 3, 5, 6 11, 12, 13 INCLUDED 6, 7 42, 43 NUMBER OF CYLINDERS KIT WILL SERVICE 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 32: Wiring Diagram
Wiring DiagraM - 871SS 97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06... -
Page 34: Warranty
Hotsy will at its option repair or replace any part covered by this warranty which is defective under normal use for one year at no charge for parts or labor. All defects must be verified by an authorized Hotsy service location.