4 hp pressure washer model 98439 set up, operating, and servicing instructions danger using an engine indoors can kill you in minutes. Engine exhaust contains carbon monoxide. This is a poison you cannot see or smell. Never use inside a home or garage, even if doors and windows are open. Only use ou...
Page 2 sku 98439 for technical questions, please call 1-800-444-3353. Contents important safety information ............................ 3 set up precautions ....................3 operating precautions ............4 vibration hazard: ..................6 service precautions ............. 6 refueling:...
Page 3 sku 98439 for technical questions, please call 1-800-444-3353. Save this manual keep this manual for the safety warn- ings and precautions, assembly, operat- ing, inspection, maintenance and cleaning procedures. Write the product’s serial number in the back of the manual near the assembly dia...
Page 4 sku 98439 for technical questions, please call 1-800-444-3353. The work area should have adequate 5. Drainage to reduce the possibility of a fall due to slippery surfaces. Wear ansi-approved safety goggles, 6. Heavy-duty work gloves, and dust mask/respirator during set up and use. Use only oi...
Page 5 sku 98439 for technical questions, please call 1-800-444-3353. Use only accessories that are recom- 6. Mended by harbor freight tools for your model. Accessories that may be suitable for one piece of equipment may become hazardous when used on another piece of equipment. Do not operate in exp...
Page 6 sku 98439 for technical questions, please call 1-800-444-3353. Cidents are caused by poorly main- tained equipment. Use the correct equipment for the 23. Application. Do not modify the equip- ment and do not use the equipment for a purpose for which it is not in- tended. The high pressure wat...
Page 7 sku 98439 for technical questions, please call 1-800-444-3353. Turn the engine switch to its a. “off” position. Allow the engine to completely cool. B. Then, remove the spark plug c. Wire(s) from the spark plug(s). Keep all safety guards in place and in 2. Proper working order. Safety guards ...
Page 8 sku 98439 for technical questions, please call 1-800-444-3353. Basic specifications fuel type 86+ octane unleaded gasoline capacity 0.55 gallons engine oil type sae 10w 30 above 32° f 5w30 at 32° f or below capacity 0.63 quarts pump oil sae 75w-90 non- detergent engine speed on pressure washe...
Page 9 sku 98439 for technical questions, please call 1-800-444-3353. Assembly attach the hose hook (31) onto the 1. Right side of the handle using bolts (19), locknuts (20), and washers (21). Attach the gun hook (30) onto the 2. Left side of the handle using bolts (19), locknuts (20), and washers (...
Page 10 sku 98439 for technical questions, please call 1-800-444-3353. Engine diagram.
Page 11 sku 98439 for technical questions, please call 1-800-444-3353. Oil. Running the engine with no or low engine oil will permanently damage the engine. Clean the oil filler cap and the area 1. Around it. Remove the oil filler cap 2. If the oil level is low, add the appropri- 3. Ate type of oil ...
Page 12 sku 98439 for technical questions, please call 1-800-444-3353. Cated below and left of the idle speed screw. Both these adjustments should only be made by a qualified service technician. Break-in period breaking-in the engine will help to 1. Ensure proper equipment and engine operation. The ...
Page 13 sku 98439 for technical questions, please call 1-800-444-3353. Hold the trigger down and move the 8. Gun back and forth slowly and steadi- ly to pressure wash the surface. Take special care when spraying surfaces made of two different materials (brick and mortar, for example), to not dam- ag...
Page 14 sku 98439 for technical questions, please call 1-800-444-3353. Technical specifications engine type single cylinder 4 stroke ohv bore x stroke 2.4” x 1.7” displacement 118cc compression ratio 8.5:1 rotation viewed from pto (power takeoff - the output shaft) counterclockwise fuel type 86+ oct...
Page 15 sku 98439 for technical questions, please call 1-800-444-3353. If this does not get the filter reason- ably clean, replace it. For foam filter elements: b. Wash the element in warm water and mild detergent several times. Rinse. Squeeze out excess water and allow it to dry completely. Soak th...
Page 16 sku 98439 for technical questions, please call 1-800-444-3353. Cause the fuel needs to refill the fuel line and new filter. Cleaning, maintenance, and lubrication schedule note: this maintenance schedule is intended solely as a general guide. If performance decreases or if equip- ment operat...
Page 17 sku 98439 for technical questions, please call 1-800-444-3353. Before starting the engine after stor- 5. Age, keep in mind that untreated gas- oline will deteriorate quickly. Drain the fuel tank and change to fresh fuel if untreated gasoline has been sitting for a month, if treated gasoline ...
Page 18 sku 98439 for technical questions, please call 1-800-444-3353. Troubleshooting problem possible causes probable solutions engine will not start fuel related: no fuel in tank or fuel valve closed. 1. Choke not in start position, 2. Especially with cold engine. Low quality or deteriorated, old...
Page 19 sku 98439 for technical questions, please call 1-800-444-3353. Troubleshooting problem possible causes probable solutions engine misfires spark plug wire loose. 1. Incorrect spark plug gap or 2. Damaged spark plug. Defective spark plug wire. 3. Old or low quality gasoline. 4. Incorrect compr...
Page 20 sku 98439 for technical questions, please call 1-800-444-3353. Troubleshooting problem possible causes probable solutions output pressure varies not enough water supply. 1. Water inlet screen is clogged. 2. Nozzle is clogged. 3. Nozzle has mineral build up. 4. Check water supply hose for kin...
Page 21 sku 98439 for technical questions, please call 1-800-444-3353. General parts list part description qty 1 frame 1 2 hose 1 3 ribbon 2 4 thermal relief cap 1 5 ribbon 1 6 inlet connection 1 7 ribbon 1 8 drain pipe 1 9 plug 2 10 foot 4 11 isolator 4 12 engine 1 13 bolt 4 14 gasket 8 15 locknut ...
Page 22 sku 98439 for technical questions, please call 1-800-444-3353. General assembly diagram.
Page 23 sku 98439 for technical questions, please call 1-800-444-3353. Pump parts list part description qty 1a cap 4 2a o-ring 4 3a check valve support 3 4a check valve spring 6 5a check valve stem 3 6a check valve box 3 7a o-ring 6 8a cover board 1 9a seal bolt 1 10a bolt 4 11a spring gasket 4 12a ...
Page 24 sku 98439 for technical questions, please call 1-800-444-3353. Pump diagram when ordering replacement parts from this list, the “a” suffix must be included in order to get the correct part..
Page 25 sku 98439 for technical questions, please call 1-800-444-3353. Engine parts list part description qty 1b flange bolt m6x12 4 2b head cover 1 3b head cover packing 1 4b breather tube 1 5b locknut 2 6b adjusting nut 2 7b rocker arm 2 8b rocker bolt m8 2 9b exhaust valve 1 10b exhaust valve spr...
Page 26 sku 98439 for technical questions, please call 1-800-444-3353. Engine diagram when ordering replacement parts from this list, the “b” suffix must be included in order to get the correct part..
Page 27 sku 98439 for technical questions, please call 1-800-444-3353. Limited 1 year / 90 day warranty harbor freight tools co. Makes ev- ery effort to assure that its products meet high quality and durability standards, and warrants to the original purchaser that for a period of ninety days from d...
Page 28 sku 98439 for technical questions, please call 1-800-444-3353. Owner’s warranty responsibilities as the engine owner, you are responsible for the performance • of the required maintenance listed in your owner’s manual. Hft recommends that you retain all receipts covering main- tenance on you...
