Karcher K 3.78 User's Manual
Contents
1. A B Step 6 Step 7 Disconnect the garden hose from Disconnect the high pressure hose Release trigger A the water inlet on the unit from the high pressure outlet and engage gun safety lock B TAKING A BREAK five minutes or more Step 1 IA Step 2 Release trigger A and engage gun JON Turn pressure washer safety lock B to off O position WINTERIZING AND LONG TERM STORAGE 1 Disconnect all water connections 4 Store the machine and accessories in 2 Turn on the machine for a few seconds a room which does not reach freezing until the water which had remained in temperatures the pump exits Turn off immediately Caution Failure to follow the above 3 Do not allow high pressure hose to directions will result in damage to the become kinked pump assembly and accessories Deck Cleaning with or without detergent Pre rinse deck and surrounding area with fresh water If using Karcher Deck and Patio Cleaner place detergent suction tube directly into cleaning solution and apply to surface at low pressure For best results limit your work area to smaller sections of approxi mately 25 square feet Allow Karcher Deck and Patio Cleaner to remain on surface 1 3 minutes Do not allow detergent to dry on surface Rinse at high pressure in a long sweeping motion keeping the spray nozzle approximately 3 6 inches from the cleaning surface Always clean from top to bottom and from left to right2. as pressure washer may remove the loose paint from the surface e While using on surfaces which might come in contact with food Flush surfaces with plenty of drinking water OPTIONAL CLEANING ACCESSORIES Optional cleaning accessories are available to further enhance your cleaning capabilities See accessories order form for product descriptions and ordering instructions e Vario Spray Wand e House Washing Wand e Extension Wand 20 inches e Flexible Spray Wand e Underbody Spray Wand e 4 Piece Extension Wand 66 inches e Wet Sandblasting Attachment e Pipe Drain Cleaner e Water Suction Hose With Filter e Extension Hose 25 e Rotating Wash Brush e K12 Surface Cleaner In USA call 1 800 537 4129 or visit our website www karcher usa com TROUBLESHOOTING Disconnect the machine from the power source before making any repair Symptom Motor will not start Unit does not reach high pressure Output pressure varies high and low On Off switch is in the OFF O position Solution Turn switch to the ON position Power cord is not plugged in Plug in power cord Extension cord is too long Extension cord is not proper gauge Extension cord is damaged Replace extension cord with either a 25 ft 12 3 gauge cord or a 50 ft 10 3 gauge cord Electrical outlet does not supply adequate power Try a different outlet Tripped circuit breaker Diameter of garden
3. KARCHER K 3 78 M High Pressure Washer Operator Manual OVEIVIOW E Important Precautions Assembly Instructions Operating Instructions GFCI Instructions Using the Accessories 00 Working with Detergents 0 Shut Down and Clean Up js Takinga Break cccsccscesseeseeeees Winterizing and Long Term SlOMAGC ennn nnn n 8 Cleaning Tipserin 9 10 Optional Cleaning Accessories 10 Troubleshooting eee 11 12 Specifications Operating pressure max 1600 PSI Water volume sasise 1 6 GPM VONAGE esecisecisscssszetesreedestetvecertes 120V AMD AAW nasa 14 AMPS In USA call 1 800 537 4129 or visit our website www karcher usa com Part No 1 423 953 0 Manual Part No 5 961 216 0 12 03 Item Description 1 Power cord with Ground Fault Circuit Interrupter GFCI Trigger gun 2 3 Trigger gun safety lock 4 High pressure hose 5 Water inlet with filter not 6 7 8 shown Transport handle Power cord holder Detergent suction tube with filter 9 High pressure outlet 10 On Off switch 11 Vario Power spray wand 12 Rotary spray wand Never Never Never Never Never Never Never point nozzle at people or animals drink alcohol or use drugs while operating this equipment operate while standing in water touch plug with wet hands let electrical connections rest in water operate pressure
4. When moving on to anew section of the cleaning surface be sure to overlap the previous section to eliminate stop marks and ensure a more even cleaning result Caution Do not use rotary spray wand on wood surfaces as it may cause damage House Siding with or without detergent Pre rinse cleaning surface with fresh water If using Karcher House or Window and Siding Cleaner place detergent suction tube directly into cleaning solution and apply to surface at low pressure for best results limit your work area to sections of approximately 6 feet and always apply detergent from bottom to top Allow Karcher House or Window and Siding Cleaner to remain on surface 1 3 minutes Do not allow detergent to dry on surface if surface appears to be drying simply wet down surface with fresh water If needed use special Wash Brush Attachment to remove stubborn dirt Rinse at high pressure from top to bottom in an even sweeping motion keeping the spray nozzle approximately 6 inches from the cleaning surface Caution Do not use rotary spray wand on siding as it may cause damage Cement Patios Brick and Stone with or without detergent Pre rinse cleaning surface with fresh water If using Karcher Deck and Patio or All Purpose Cleaner place detergent suction tube directly into cleaning solution and apply to surface at low pressure For best results limit your work area to smaller sections of approxi mately 25 square feet Allow Karcher De
5. ck and Patio or All Purpose Cleaner to remain on surface 1 3 minutes Do not allow detergent to dry on surface Rinse at high pressure in a sweeping motion keeping the spray nozzle approximately 3 6 inches from the cleaning surface Always clean from top to bottom and from left to right For removing extremely stubborn stains use the rotary spray wand Cars Boats amp Motorcycles with or without detergent Pre rinse vehicle with fresh water If using Karcher Vehicle or All Purpose Cleaner place detergent suction tube directly into cleaning solution and apply to surface at low pressure For best results clean one side of vehicle at atime and always apply detergent from bottom to top do not allow detergent to dry on surface If needed use special Wash Brush Attachment to remove stubborn dirt Rinse at high pressure in a sweeping motion keeping the spray nozzle approximately 6 8 inches from the cleaning surface distance should increase when rinsing pin striping or other sensitive surfaces Always clean from top to bottom and from left to right For best results wipe surface dry with a chamois or soft dry cloth Caution Do not use the rotary spray wand on vehicles as it may cause damage CLEANING TIPS continued Barbecue Grills Outdoor Power Equipment amp Gardening Tools with or without detergent Pre rinse cleaning surface with fresh water If using Karcher All Purpose Cleaner or Degreaser place detergent suction
6. ension cords are identified by the marking Acceptable for use with outdoor appliances store indoors while not in use Use only extension cords having an electrical rating not less than the rating of the product Do not use damaged extension cords Examine extension cord before using and replace if damaged Do not abuse extension cord and do not yank on any cord to discon nect Keep cord away from heat and sharp edges Always disconnect the extension cord from the receptacle before disconnecting the product from the extension cord If you are using an extension cord it should always be completely unwound from the cable drum Ground Fault Circuit Interrupter GFCl Protection This product is supplied with a Ground Fault Circuit Interrupter GFCI built into the power cord plug This device provides additional protection from the risk of electric shock If power is interrupted in the line the GFCI will automatically re close the circuit to the load after power is restored Depending on the GFCI model it may be necessary to manually operate the reset button to restore power to the GFCI load circuit If replacement of the plug or cord is needed use identical replace ment parts Grounding Instructions This product must be grounded If it should malfunction or breakdown grounding provides a path of least resistance for electric current to reduce the risk of electric shock This product is equipped with a cord having an equipme
7. es 9 amp 10 for specific information on how to clean different surfaces Always Use Karcher Detergents for Best Results Karcher biodegradable detergents are specially formulated to protect the environment and your pressure washer Special formula won t clog the suction tube filter and will protect the internal parts of the pressure washer for a longer life For Karcher Detergents check your retailer or call In USA call 1 800 537 4129 or visit our website www karcher usa com The following Karcher detergents are available One Gallon ready to use e Vehicle Wash e Degreaser e All Purpose Cleaner House Wash e Deck Wash Detergent Concentrate Tablets 10 Pack makes 1 1 4 gallon RTU product e All Purpose e Degreaser e Deck and patio e Windows and Siding Caution Never use Bleach Chlorine products and other corrosive chemicals e Liquids containing solvents i e paint thinner gasoline oils Trisodium phosphate products Ammonia products Acid based products These chemicals will harm the unit and will damage the surface being cleaned SHUTTING DOWN amp CLEANUP O 7 Step 1 Step 2 Step 3 Step 4 Remove detergent suction Turn the switch to off Turn off the water Press trigger to tube from container and O position and source release water insert into 1 gallon of fresh unplug cord from pressure water Siphon water at low outlet pressure for one minute
8. hose is too small Reset breaker power supply or ground fault circuit interrupter Replace with a 3 4 inch garden hose Water supply is restricted Check garden hose for kinks leaks and blockage Not enough inlet water supply Open water source full force Water inlet filter is clogged Remove filter and rinse out in warm water Spray wand is in low pressure position Not enough inlet water supply Turn spray wand to high pressure position Turn water on full force Check garden hose for kinks leaks or blockage Pump is sucking air Check that hoses and fittings are air tight Turn off machine and purge pump by squeezing trigger gun until a steady flow of water emerges through the nozzle Water inlet filter is clogged Remove filter and rinse out in warm water Discharge nozzle is obstructed Blow out or remove debris with a fine needle Calcified gun hose or spray wand Run distilled vinegar through detergent suction tube TROUBLESHOOTING continued Symptom No detergent Garden hose connection leaks Spray wand leaks Pump is noisy Water leaks from pump up to 10 drops per minute is permissible Oil Drip In USA Call or visit our website www karcher usa com Detergent suction tube not properly connected to the machine Solution Check connection Detergent is too thick Dilute detergent for be
9. nt grounding conductor and a grounding plug The plug must be plugged into an appropriate outlet that is properly installed and grounded in accordance with all local codes and ordinances DANGER Improper connection of the equipment grounding conductor can result in a risk of electrocution Check with a qualified electrician or service personnel if you are in doubt as to whether the outlet is properly grounded Do not modify the plug provided with the product if it will not fit the outlet have a proper outlet installed by a qualified electrician Do not use any type of adapter with this product A Caution Follow the maintenance instructions specified in the manual This machine has been designed for use with cleaning detergent supplied or recommended by the manufacturer The use of other cleaning detergents may affect the operation of the machine and void the warranty IMPORTANT PRECAUTIONS continued Water Supply Cold Water Only e Water hose must be at least 3 4 inch in Never use the pressure washer to draw in diameter water contaminated with solvents e g e Flow rate of water supply must not fall paint thinner gasoline oil etc below 2 5 GPM gallons per minute Always prevent debris from being drawn e Flow rate can be determined by running into the unit by using a clean water the water for one minute into an empty source 5 gallon container e The water supply temperature must not Save
10. st results use K rcher detergent Filter on detergent suction tube is clogged Run warm water through filter to remove debris Damaged or clogged detergent suction tube Remove obstruction or replace detergent suction tube Spray wand is in high pressure position Turn spray wand tip to low pressure position Discharge nozzle is obstructed Loose fittings Blow out or remove debris with ine needle Tighten fittings Missing worn rubber washer Spray wand not properly attached nsert new washer nsert the spray wand into the trig ger gun Carefully press in against he spring tension and twist into he locked position Broken o ring or plastic insert Pump is sucking air Loose fittings Call K rcher customer service hotline and order repair kit part no 2 883 111 0 Check that hoses and fittings are air tight Turn off machine and purge pump by squeezing trigger gun until a steady flow of water emerges through the nozzle Check that all fittings are tight 1 800 537 4129 Water seals are damaged or worn Oil seals are damaged or worn Call service center Call service center If you encounter any additional difficulties not listed please call our service center for help Karcher Customer Support USA
11. these instructions exceed 104 F 40 C ASSEMBLY INSTRUCTIONS Step 2 Pull out the locking slide from the right side of the trigger gun handle and insert the small end of the high pressure hose into place Push the locking slide back into the trigger gun to lock the hose in position OPERATING INSTRUCTIONS Step 1 Step 2 Connect the high pressure hose to the high Insert the spray wand of your choice into the pressure outlet trigger gun Press in against the spring tension and twist into the locked position Step 3 Step 4 Connect the garden hose to the water inlet Connect garden hose to the cold water source and turn water on completely Plug the power cord into the power outlet BA A Step 5 Unlock the lock of the trigger gun Step 6 Turn on the pressure A Trigger the gun B to eliminate trapped washer The motor starts only if the air wait for a steady flow of water to emerge trigger of the gun is pulled and shuts off from the spray nozzle when the trigger is released Note The actual appearance of the GFCI may be different from this illustration Step 2 Plug the Ground Fault Circuit Interrupter Press TEST then press RESET to assure GFCl into a working outlet proper connection to power USING THE ACCESSORIES Vario power spray wand The spray wand allows you to adjust the cleaning pressure To clean at ma
12. tube directly into cleaning solution and apply detergent at low pressure Allow Karcher detergent to remain on surface 1 3 minutes Do not allow detergent to dry on surface Rinse at high pressure keeping the spray nozzle approximately 3 6 inches from the cleaning surface For removing extremely stubborn dirt it may be necessary to move the spray nozzle even closer to the surface for greater dirt cutting action Caution Do not use rotary spray wand on cloth plastic or other sensitive surfaces as it may cause damage Patio amp Lawn Furniture with or without detergent Pre rinse furniture and surrounding area with fresh water If using Karcher All Purpose Cleaner place detergent suction tube directly into cleaning solution and apply to surface at low pressure Allow Karcher All Purpose Cleaner to remain on surface 1 3 minutes Do not allow detergent to dry on surface If needed use special Wash Brush Attachment to remove stubborn dirt Rinse at high pressure in a sweeping motion keeping the spray nozzle approximately 3 6 inches from the cleaning surface For best results clean from top to bottom and from left to right Caution Do not use rotary spray wand on patio or lawn furniture as it may cause damage Recommendations e Before cleaning any surface an incon spicuous area should be cleaned to test spray pattern and distance for maximum cleaning results If painted surfaces are pealing or chipping use extreme caution
13. washer without the water turned on use hot water IMPORTANT PRECAUTIONS Read First A Safety Warnings When using this product basic precautions should always be followed e Read all the instructions before using the product High pressure jets can be dangerous if subject to misuse The jet must not be directed at persons animals electrical devices or the machine itself e To reduce the risk of injury do not operate the machine near children Learn how to stop the machine and release pressure quickly Be thoroughly familiar with the controls Stay alert watch what you are doing Wear safety goggles e Do not use acids solvents or any flammable material in this product These products can cause physical injuries to the operator and irreversible damage to the machine e Do not operate the product when fatigued or under the influence of alcohol or drugs Keep operating area clear of all persons e Do not stand on unstable surfaces Stand with both feet balanced at all times To reduce the risk of electrocution keep all connections dry and off the ground Do not touch plug with wet hands e The Trigger Gun Safety Lock PREVENTS the trigger from accidentally being engaged This safety feature DOES NOT lock trigger in the on position Extension Cords Use a sufficient gauge Up to 25 ft 12 3 AWG 25 to 50 ft 10 3 AWG Use only extension cords that are intended for outdoor use These ext
14. ximum pressure the spray wand must be positioned to the high pressure setting To apply detergent the wand must be positioned to the low pressure setting For lower pressure turn wand collar in the minus direction For higher pressure turn wand collar in the plus direction AN This wand features a 0 pencil jet which Warning rotates 360 for maximum dirt cutting action TO AVOID SERIOUS INJURY NEVER effectively increasing cleaning performance POINT SPRAY NOZZLE AT YOURSELF up to 50 This wand combines the cleaning OTHER PERSONS OR ANIMALS performance of a 0 pencil jet with the surface coverage of a wide angle nozzle Not recommended for soft materials siding painted surfaces decks or autos A A7 WORKING WITH DETERGENTS To apply detergents you must be operating at low pressure Step 1 Install the Vario spray wand Set the Vario spray wand to the low pressure setting by turning the wand collar The wand must be set in the low pressure position to apply detergents AN ae Step 2 Fill a container with Karcher detergent Place the filter end of detergent suction tube into the container A Step 3 Turnon the pressure washer Pull trigger to operate unit Liquid detergent is drawn into the unit and mixed with water Apply detergent to work area Do not allow detergent to dry on surface For best results see Cleaning Tips on pag
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