Hotsy 781SS Operating Instructions And Parts Manual Download Page 6

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97-6642 • HOTSY 781SS, 871SS, 921SS • REV. 7/06

OPERA

TOR’S MANU

PRESSURE

ASHER

cOMpOnEnt iDEntificatiOn

trigger gun

control box

high

pressure hose

Wand

burner Exhaust

vent

coil Drain plug

hour

Meter

Engine fuel tank

burner

pump

Detergent

inlet Line

burner

fuel tank

high pressure

nozzles

thermostat

burner Switch

Engine

pump

— Delivers a specific gpm to the high pressure

nozzle which develops pressure.

Spray gun

— Controls the application of water and

detergent onto cleaning surface with trigger device.
Includes safety latch.

Wand

— Must be connected to the spray gun.

high pressure hose

— Connect one end to water

pump high pressure discharge nipple and the other
end to spray gun.

unloader valve

— Safety device which, when the

spray gun closes, prevents over pressurization.

unloader

Summary of Contents for 781SS

Page 1: ...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 MODELS 781SS 871SS 921SS serial number date purchased for sales and serv...

Page 2: ...me At Pump Head 2 5 GPM 150 GPH Pump Pressure At Pump Head 2000 PSI Burner Type Fuel Oil Fired 248 500 BTU Hr Burner Fuel Pressure 140 PSI Machine Power Rating 6 HP Robin Subaru Manual Start Machine Weight 287 Lbs Shipping Weight 326 Lbs Exhaust Stack Size 8 Machine Dimensions Length 48 Width 27 Height 42 5 921SS SPECIFICATIONS Pump Volume At Pump Head 3 0 GPM 180 GPH Pump Pressure At Pump Head 30...

Page 3: ...or future reference Introduction Important Safety Information 4 5 Component Identification 6 Assembly Instructions 7 Installation Instructions 8 9 Operating Instructions 10 11 Storage 11 12 Maintenance 13 Troubleshooting 14 15 Exploded Views 16 17 Exploded View Parts List 18 19 Burner Assembly Parts List 20 Control Box Assembly Parts List 21 Coil Outlet Assembly Parts List 22 Hose Spray Gun Assemb...

Page 4: ... stop the machine and bleed pres sures quickly Be thoroughly familiar with the con trols 3 Stay alert watch what you are doing 4 All installations must comply with local codes Contact your electrician plumber utility company or the selling distributor for specific details WARNING Flammable liquids can create fumes which can ignite causing property dam age or severe injury 5 Risk of explosion do no...

Page 5: ... Inlet water must be from a cold clean fresh city water supply WARNING Only use recom mended fuel Using other fuels may result in a serious explosion causing personal injury property damage or loss of life 18 Use No 1 or No 2 heating oil ASTM D306 only NEVER use gasoline in your fuel oil tank Gas oline is more combustible than fuel oil and could result in a serious explosion NEVER use crank case o...

Page 6: ... Thermostat Burner Switch Engine Pump Delivers a specific gpm to the high pressure nozzle which develops pressure Spray Gun Controls the application of water and detergent onto cleaning surface with trigger device Includes safety latch Wand Must be connected to the spray gun High Pressure Hose Connect one end to water pump high pressure discharge nipple and the other end to spray gun Unloader Valv...

Page 7: ...arts Bag Containing Pressure Nozzles 3 Ea Quick Disconnects 2 Ea Quick Disconnect Plug Trigger Gun Tools Required 8 Adjustable Wrench Teflon Tape Flat Blade Screwdriver Pressure Hose Trigger Gun and Wand 1 When assembling use teflon tape on all threaded plumbing connections to prevent leakage 2 Install the pressure hose on the pressure washer as shown in Figure 1 3 Assemble wand components as show...

Page 8: ...utside atmosphere Be sure the flue is the same size as the burner exhaust vent on the pressure washer See Figure 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 insufficient supply of oxygen Proper combustion can only be obtained when...

Page 9: ...xt slowly open the air shutter until white smoke just starts to appear Turn air shutter halfway back to the black smoke position previously noted Tighten locking screws If the desired position cannot be obtained using only the air shutter lock the air shutter in as close a position as can be obtained then repeat the above procedure on the air band setting CAUTION If white smoke appears from burner...

Page 10: ...er lock to prevent accidental operation of the trigger gun Refer to Figure 4 The manual trigger lock should be used whenever the trigger gun is not in use To Start DANGER DO NOT point wand or trigger gun at your self or at any person Bodily injury may result from water under high pressure WARNING Wear eye ear hand foot and skin protec tion at all times while operating pressure washer IMPORTANT The...

Page 11: ...er lightweight parts should be clamped down so the pressure does not push them away 10 Turn the side detergent control knob clockwise CW for detergent decrease Wait for detergent to clear Always rinse with cold water after using detergent Rinse from the top to the bottom to prevent detergent from dripping onto a rinsed area For the best results contact your Hotsy dealer to help you select the best...

Page 12: ...f the wand 13 Squeeze and release the trigger of the trigger gun several times to antifreeze the unloader system 14 Release the trigger of the trigger gun Stop engine 15 Squeeze the trigger of the trigger gun to relieve system pressure For added protection after antifreezing disconnect the pressure hose from the machine and remove the coil drain plug After coil has drained replace pressure hose an...

Page 13: ...al 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 non...

Page 14: ...sn t show with in 10 15 seconds discontinue running the machine and troubleshoot as damage to the pump will occur if allowed to run LOW SPRAY PRESSURE AT PRESSURE NOZZLE Inadequate water supply Fully open faucet Check for kinked or dam aged hose Use 3 4 inch minimum hose Check for debris clogging inlet screen Partially clogged or damaged pressure nozzle Clean or replace Air being drawn through det...

Page 15: ...OT WATER continued Thermostat set too low Adjust thermostat to desired temperature Blown fuse Replace Fuse is located in Control Box Engine is running too slow Move throttle lever to full throttle position POOR OR NO DETERGENT FLOW Inadequate detergent supply Refill detergent container Ensure that pick up screen is fully immersed Open detergent valve Detergent screen or hose clogged Clean Always s...

Page 16: ... S MANUAL PRESSURE WASHER 16 Exploded View Left Side 19 9 14 15 16 18 13 12 24 23 53 11 27 7 8 26 25 6 5 2 1 6 5 10 22 21 20 44 6 5 54 For Detail See Coil Outlet Assy For Detail See Control Box Illus For Detail See Burner Illus Rectifier Reversed View ...

Page 17: ... 871SS 921SS REV 7 06 17 PRESSURE WASHER OPERATOR S MANUAL Exploded View Right Side 43 33 31 46 45 6 50 49 47 48 41 51 52 40 30 32 33 31 29 28 36 37 35 34 39 32 38 31 32 4 32 31 42 3 5 6 For Detail See Pump Assy Illus 55 ...

Page 18: ...h on 30 14 735323 Screw 10 32 x 3 4 BH SOC CS 4 15 268006 Insulation Cerafelt 18 x 50 1 16 226222 Coil 16 1 17 780480 Washer 3 8 Lock Split Ring 921SS 4 18 375449 Coil Tank SS Weldment 1 19 824115 Clip Retaining U Type 4 20 213044 Top Hat Weld Assy 16 Hotsy Coil 1 21 268004 Insulation Cerafelt 16 OD x 8 3 ID 1 22 860102 Ring Insulation Retainer 16 Top Hat 1 23 829979 Label Plate Aluminum 2 24 10 0...

Page 19: ... 4 50 262208 Hose 3 8 x 22 1 Wire Pressure Loop 871SS 1 4 02047722 Hose 3 8 x 22 2 Wire 781SS 921SS 1 51 801102 Nipple 3 8 Hex Steel 1 52 715744 Plug 3 8 Sq Head Galv 1 53 926598 Rivet 1 8 x 1 4 POP AL 8 54 90 10127 Bolt 5 16 x 2 3 4 Whiz Loc 781SS 871SS 2 444461 Label Caution Gasoline White 1 646026 Label Warning Carbon Monoxide 1 834153 Label Fuel Type 1 834154 Label Caution Winterize 1 834159 L...

Page 20: ... 1 5 698200 Pipe Nipple 1 4 x 2 1 2 1 6 823988 Clamp 2 7 698019 Nipple 1 8 x 1 4 Hose 1 8 900650 Nozzle 1 50 90 1 9 Replacement Parts 875490 Filter Element 1 723369 Solenoid 1 661413 Electrodes 1 830492 Fuel Pump 1 676894 Fuel Line 1 783813 Motor 1 630730 Coupling 1 676640 Blower Fan 1 Not Shown Electrode Settings Burner Assembly Parts List 6 1 8 Air Cone 8 5 16 3 16 1 4 2 6 1 5 4 3 7 Nozzle Elect...

Page 21: ...Pan Head 2 7 915390 Plate Thermostat Cover 1 8 955930 Thermostat 1 9 707147 Capacitor 1 10 612937 Bolt 1 4 x 3 4 4 11 70 180503 Screw M4 x 10 4 12 703127 Locknut 1 2 3 13 615414 Box Back 1 14 703185 Nut 1 4 4 15 6 051561 Strain Relief 3 676638 Fuse ATC 30 Amp 1 707146 Holder Fuse 1 829620 Plug 1 16 358026 Clamp 1 17 612945 Bolt 1 4 20 x 1 2 1 18 703106 Nut 1 4 1 19 2 011681 Cap Capacitor 1 37 x 1 ...

Page 22: ... Screw Pan Head 4 mm x 4 mm 1 3 2 3409 Rupture Disk 1 4 844623 Elbow 3 8 Female Brass 1 5 698247 Nipple Pipe 1 2 x 2 1 6 2 00494 Plug 1 2 Allen Countersunk 1 7 815220 Bushing 1 2 x 3 8 Steel 1 8 844806 Nipple 3 8 x 3 8 NPT ST Male 1 9 898035 Hose Barb 3 8 Barb x 3 8 ML Pipe 1 10 646673 Label Hot Water Outlet 1 2 4 9 2 10999 90 1981 2 3409 2 1019 2 0008 2 00494 2 00681 2 2007 2 10862 10 09004 ...

Page 23: ... PART NO DESCRIPTION QTY 1 4 02033450C Hose 3 8 x 50 1 Wire Tuff Skin 1 2 860447 Gun Shutoff 1 3 915786 Nipple 1 4 x 1 4 NPT ST Male 1 4 826169 Coupler 1 4 Female Brass 2 5 936647 Wand SGL STR Insulated 48 1 6 799091 Nozzle SACQMEG 0003 5 Red 1 799092 Nozzle SACQMEG 1503 5 Yellow 1 799093 Nozzle SACQMEG 4003 5 White 1 3 1 2 4 6 4 5 ...

Page 24: ...30209 Nut 1 25 70 090520 Brass Handle 1 Kit A 70 262813 O Ring Repair Kit Kit B 70 262814 Outlet Kit Kit C 70 262815 Stem Repair Kit VBA35 Unloader exploded view ITEM Part description Kit qty 1 70 020452 Body Valve 1 2 70 060141 O Ring A C 1 3 70 150316 Seat C 1 4 70 450401 Ball Sub assy C 1 5 70 060114 O Ring A 1 6 70 010111 Guide Bushing 1 7 70 000919 Teflon Ring A 1 8 70 060170 O Ring A 2 9 70 ...

Page 25: ...I 1 2 5 3329 Unloader VBA 35 6 6 6000 PSI 1 3 921422 Pump Protector 1 2 PTP 1 4 722774 Nipple 1 2 x 3 8 Pipe 1 5 873596 Injector Adjustable Inlet 1 6 961534 Hose 1 4 x 1 2 Braided Vinyl 4 ft 7 935159 Strainer Chemical w 1 4 Brass Barb 1 8 823989 Clamp Hose UNI 40 48ST 1 9 801126 Swivel 3 8 MP x 3 4 GHF w Strainer 1 10 661357 Elbow 1 2 JIC 3 8 90 1 11 6 021720 Switch Pressure 1 12 830302 Plug 1 4 C...

Page 26: ...PSI 1 2 5 3329 Unloader VBA 35 6 6 6000 PSI 1 3 921422 Pump Protector 1 2 PTP 1 4 722774 Nipple 1 2 x 3 8 Pipe 1 5 873596 Injector Adjustable Inlet 1 6 961534 Hose 1 4 x 1 2 Braided Vinyl 4 ft 7 935159 Strainer Chemical w 1 4 Brass Barb 1 8 823989 Clamp Hose UNI 40 48ST 1 9 801126 Swivel 3 8 MP x 3 4 GHF w Strainer 1 10 644802 Elbow 3 8 Street 90 1 11 6 021720 Switch Pressure 1 12 830302 Plug 1 4 ...

Page 27: ... Braided Vinyl 4 ft 7 935159 Strainer Chemical w 1 4 Brass Barb 1 8 823989 Clamp Hose UNI 40 48ST 1 9 801126 Swivel 3 8 MP x 3 4 GHF w Strainer 1 10 661357 Elbow 1 2 JIC 3 8 90 1 11 6 021720 Switch Pressure 1 12 95 07101128 Rail Pump Support 1 13 703146 Nut 3 8 OSNA NC 921SS 1 14 780452 Washer 5 16 Flat SAE 921SS 2 15 615532 Bolt 8 mm x 16 mm HEX Head 921SS 2 16 612951 Bolt 3 8 x 1 1 4 NC HH 921SS...

Page 28: ... 14 70 160147 Valve Plug 6 15 70 060308 Washer Copper 1 16 70 160121 Brass Plug G1 4 1 17 70 180118 Manifold Stud Bolt 8 18 70 140001 Washer 8 19 70 060306 Copper Washer 3 8 1 20 70 160117 Brass Plug 3 8 2 item Part no Description QTY 25 70 180112 Hexagonal Screw 9 26 70 020318 Bearing Cover 1 27 70 020502 Seal Bearing 1 28 70 150003 Snap Ring 1 29 70 021300 Ball Bearing 1 30 70 000498 Crankshaft ...

Page 29: ...2 x 107 62 1 49 70 020352 Crankcase Cover 1 50 70 060302 Gasket G3 8 1 51 70 070005 Sightglass G3 8 1 Part available in kit See below HG Series Pump Exploded View Parts List Repair kit number 70 261408 70 261409 70 261404 70 260028 70 260826 Kit description Plunger Seal 15mm Complete Seal Packing 15mm Plunger 15mm Complete Valve Plunger Oil Seals item numbers included 3 5 6 2 3 4 5 6 7 38 39 40 41...

Page 30: ... 060155 O Ring Ø1 78 x 15 54 6 12 See Kit Below Valve Assembly 6 13 70 060122 O Ring Ø2 62 x 18 77 6 14 70 160147 Valve Plug 6 15 70 060308 Washer Copper 1 16 70 160121 Brass Plug G1 4 1 17 70 180118 Manifold Stud Bolt 8 18 70 140001 Washer 8 item Part no Description QTY 19 70 060306 Copper Washer 3 8 1 20 70 160117 Brass Plug 3 8 2 25 70 180112 Hexagonal Screw 9 26 70 020318 Bearing Cover 1 27 70...

Page 31: ...204 Connecting Rod Pin 3 46 70 010008 Connecting Rod 3 47 70 140102 Spring Washer 6 48 70 180132 Connecting Rod Screw 6 49 70 070005 Sight Glass G3 8 1 50 70 060302 Gasket G3 8 1 51 70 020352 Crankcase Cover 1 52 70 060104 O Ring 2 62 x 107 62 1 Part available in kit See below Repair kit number 70 261408 70 261409 70 261404 70 260028 70 260826 Kit description Plunger Seal 15mm Complete Seal Packin...

Page 32: ...97 6642 HOTSY 781SS 871SS 921SS REV 7 06 PRESSURE WASHER Wiring Diagram 32 Wiring Diagram 871SS ...

Page 33: ......

Page 34: ...he option of the Hotsy Corporation WARRANTY DISCLAIMER Hotsy has made a diligent effort to illustrate and describe the product in this literature accurately however such illustrations and descriptions are for the sole purpose of identification and do not express or imply a warranty that the product is merchantable or fits a particular purpose or that the product will necessarily conform to the ill...

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