This owner’s manual is considered a permanent part of the pump. It must be available to all operators of the pump and should remain with the pump if resold. The information and specifications in this publication are based on the latest product information available at the time of printing. American Honda Motor Co., Inc. reserves the right to make changes at any time without notice and without incurring any obligation. No part of this publication may be reproduced without written permission.
Congratulations on your selection of the Honda WMP20X multi-purpose pump. We are certain you will be pleased with your purchase. You can enhance the perfomance of your new pump by taking time to study this manual. In it you’ll learn how to use it safely and efficiently. The service interval and maintenance recommendations in this manual were developed to provide you with the optimum performance and service from your pump. We suggest you follow them.
Safety Messages Your safety and the safety of others is very important. We have provided important safety messages in this manual and on the pump. Please read these messages carefully. A safety message alerts you to potential hazards that could hurt you or others. Each safety message is preceded by a safety alert symbol A and one of three words: DANGER, WARNING, or CAUTION. You WILL be KILLED or SERIOUSLY HURT if you don’t follow instructions.
CONTENTS Turn to the beginning of each section for a complete list of subjects. WATER PUMP SAFETY Important information about some specific hazards, and what you can do to prevent injury. 1 CONTROLS lden tifica tion of components and information about how the controls work. 5 PRE-OPERATION CHECK How to fuel and check your pump to be sure it is ready. 9 OPERATION Preparing the pump, starting and stopping the engine, and pumping tips.
PUMP SAFETY This section explains what you need to know to operate your multi-purpose pump safely.
PUMP SAFETY SAFETY INFORMATION Your Honda multi-purpose pump is designed to give safe and dependable service if operated according to instructions. Read and understand this owner’s manual before operating your pump. You can help prevent accidents by being familiar with your pump’s controls, and by observing safe operating procedures Operator Responsibility Know how to stop the pump quickly in case of emergency. Understand the use of all controls and connections.
PUMP SAFETY REFUEL WITH CARE Gasoline is extremely flammable and gasoline vapor can explode. Refuel only outdoors, in a well-ventilated area with the engine stopped. Never smoke near gasoline, and keep other flames and sparks away. Always store gasoline in an approved container.
PUMP SAFETY SAFETY LABEL LOCATIONS The labels shown here contain important safety information. Please read them carefully. These labels are considered permanent parts of your multi-purpose pump, so if a label comes off or becomes hard to read, contact your authorized Honda water pump dealer for a replacement.
CONTROLS CONTROLS This section shows you where controls are located and tells you what they do and how they work. Component Identification 6 Controls 7 ................. Throttle lever .................. Choke lever Fuel valve ................... Ignition switch ................. Oil Alert system Recoil starter ................ .................
CONTROLS Component Identification This identifies components and where to find the most frequently used controls.
CONTROLS Controls You will use these controls every time you operate your multi-purpose pump. THRO’ITLE LEVER I Throttle Lever The throttle lever controls the engine speed. Moving the throttle fully to the left gives maximum engine speed. Moving the throttle lever fully to the right returns the engine to idle speed. The pump output can be THROlTLE controlled by adjusting the throttle lever to the desired position. At maximum throttle position, the pump will deliver the highest output volume.
CONTROLS Ignition Switch The ignition switch allows the operator to start and stop the engine. Switch positions; OFF: To stop the engine. ON: To start and run the engine. Oil Alert System The Oil Alert system is designed to prevent engine damage caused by an insufficient amount of oil in the crankcase. Before the oil level in the crankcase can fall below a safe limit, the Oil Alert system will automatically shut down the engine (the ignition switch will remain in the ON position).
PRE-OPERATION CHECKS PRE-OPERATION CHECKS This section shows you how to check and prepare your pump for operation. Engine oil 10 Fuel Refueling . . . . . . . . . . . . . . . . . . . . . Fuel recommendations . . . . . . . . . . . . . . Oxygenated fuels . . . . . . . . . . . . . . . . .
PRE-OPERATION CHECKS Engine oil Check the oil level with the pump on a level surface and the engine stopped. Use Honda 4-stroke oil, or an equivalent high detergent, premium quality motor oil certified to meet or exceed U.S. automobile manufacturer’s requirements for Service Classification SG, SF/CC, CD. Motor oils classified SG, SF/CC, CD will show this designation on the container. SAE low-30 is recommended for general, all-temperature use.
PRE-OPERATION CHECKS Fuel Fuel tank capacity: 3.6 I(0.95 US gal) Pump octane rating: Use unleaded gasoline 86 or higher Refueling Refuel in a well ventillated area with the engine stopped. Gasoline is extremely flammable and is explosive and you can be burned or seriously injured when refueling. l Stop the engine and keep heat, sparks, and flames away. l Refuel only outdoors. l Wipe up spills immediately. 1. Remove the filler cap and check the fuel level. 2.
PRE-OPERATION CHECKS Fuel Recommendation We recommend unleaded gasoline because it produces fewer engine and spark plug deposits and extends exhaust system life. Never use stale or contaminated gasoline or oil/gasoline mixture. Avoid getting dirt or water in the fuel tank. Occasionally you may hear light “spark knock” or “pinging” (metallic rapping noise) while operating under heavy loads. This is no cause for concern.
PRE-OPERATION CHECKS Oxygenated Fuels Some gasolines are blended with alcohol or an ether compound. These gasolines are collectively referred to as oxygenated fuels. To meet clean air standards, some areas of the United States and Canada use oxygenated fuels to help. If you use an oxygenated fuel, be sure its pump octane rating is 86 or higher. Before using an oxygenated fuel, try to confirm the fuel’s contents. Some states/provinces require this information to be posted on the pump.
PRE-OPERATION CHECKS Air cleaner A dirty air cleaner will restrict the air flow to the carburetor causing carburetor malfunction. Inspect the air cleaner regularly. 1. Remove the outer wing nut and air cleaner cover. 2. Remove the inner wing nut that secures the elements. 3. Remove the air cleaner elements (inner paper and outer foam) and check to be sure they are clean and in good condition. 4. Clean or replace the elements as necessary (page 29). 5.
PRE-OPERATION Cl-l ECKS High Elevation Operation At high altitude, the standard carburetor air-fuel mixture will be too rich. Performance will decrease, and fuel consumption will increase. A very rich mixture will also foul the spark plug, cause hard starting and contribute to air pollution. High altitude performance can be improved by installing a smaller diameter main fuel jet in the carburetor and readjusting the pilot screw.
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PUMP OPERATION PUMP OPERATION This section tells how to operate your pump safely and effective/y. Pump preparation Suction hose connection . Discharge hose connection Priming the pump . . . . . Pump performance . . . . Starting the engine . . . . . . . . . . . . . . . . . . . . . . . . . , . . . , . . . . . . . . . . . . . . . . . . 18 18 19 19 20 21 22 Stopping the engine In an emergency . . . . . . . . . . . . . . . . . 23 Normal use . . . . . . . . . . . . . . . . . . . .
PUMPOPERATION Pump Preparation Connect the Suction Hose Use a commercially available hose, hose connector, and hose clamps. The suction hose must be reinforced, non-collapsible wall or wire braided to prevent suction collapse. Keep the pump as close to the liquid to be pumped as possible. Avoid bends and sharp turns. Pump performance is best when the pump is not far above the liquid level and the hose is kept straight. Self-priming time is also proportional to the suction hose length.
PUMP OPERATION Connect the Discharge Hose Use a commercially available hose, hose connector, and hose band. A short, large diameter hose will provide lower fluid friction and improve pump efficiency. A long or small diameter hose increases fluid friction and reduces pump output. Tighten the hose band to prevent the hose from disconnecting under high pressure.
PUMPOPERATION Liquid Recomendations The following tables contain a list of chemicals that the multi-purpose pump is capable of handling. The operator must verify that the liquid that is to be pumped is on this list. Chemicals can cause burns or serious injury. You can be burned or seriously injured if certain chemicals are allowed to contact your body. Wear protective clothing and eye protection when handling chemicals.
PUMP OPERATION Pump Performance Pump discharge capacity is determined at 0 meters (0 ft) total head and at sea level. As the total head increases (discharge + suction head), pump discharge capacity will decrease. If the pump is used at higher elevations, pump discharge capacity will also decrease (see page 15). Other factors affecting pump discharge capacity are length and type of the suction and discharge hose used.
PUMP OPERATION Starting the Engine 1. Turn the fuel valve to the ON position. 2. Move the choke lever to the CLOSED position. CHOKE,LEVER Do not use the choke if the engine is warm or the ambient temperature is high. 3. Turn the ignition switch to the ON position. 4. Move the throttle lever slightly to the left.
PUMP OPERATION 5. Pull the starter grip lightly until resistance is felt, then pull it briskly. (1 Return the starter grip slowly back to the engine to prevent damage to the starter. 6. As the engine warms up, gradually open the choke to the OPEN position. STARTER GRIP I CHOKE LEVER I 7. Set the throttle at the desired speed to produce the best pumping conditions. THROlTLE The pump output can be controlled by adjusting the throttle lever to the desired position.
PUMP OPERATION Stopping the Engine In an emergency: \\ IGNITION SWITCH To stop the engine in an emergency, turn the ignition switch to the OFF position. In normal use: 1. Move the throttle lever fully to the right to the IDLE position. THROlTLE I\ : 2. Turn the ignition switch to the OFF position. 3. Turn the fuel valve to the OFF position. 4.
MAINTENANCE This section tells you how to perform normal maintenance on your multi-purpose pump Maintenance Precautions 26 Maintenance Schedule 27 Engine Oil Change 26 Air Cleaner 29 Spark Plug 31 Fuel Sediment Cup 32 Fuel Filter 33 Spark Arrester (optional part) 34 25
MAINTENANCE Maintenance Precautions Periodic maintenance is necessary to keep your pump in good operating condition. Perform the service and inspection at the intervals shown in the Maintenance Schedule (p. 27). Use only genuine HONDA parts or their equivalent for maintenance or repair. Replacement parts which are not of equivalent quality may damage the pump. These Procedures should be performed by a person with appropriate mechanical skills and using the correct hand tools.
MAINTENANCE Maintenance Schedule This table shows you what you need to service and when to do it. Interval Before Every use Item First Every M;th Mofths 20 HIS. 6Oo;rs. Every 6 Months 1OCZlrS. Every Year 3ocLs. 0 Sediment Cup 0 Spark plug Check 0 Spark Arrester (3) Clean 0 Fuel tank and strainer Clean o(2) Valve clearance Adiust w Fuel line Check1 Replace every 3 years (2) (1) Service more frequently when used in dusty areas. Replace if damaged.
MAINTENANCE Engine Oil Change Drain the oil while the engine is warm to assure rapid and complete draining. 1. Remove the oil filler cap, drain plug and sealing washer to drain the oil. Drain into a suitable container. 2. Reinstall the drain plug and sealing washer. Tighten the plug securely. 3. Refill with the recommended oil (see page 10) and check the level. Oil capacity: 0.6 Z(0.6 US qt) Thoroughly wash your hands with soap and water as soon as possible after handling used oil.
MAINTENANCE Air Cleaner Service A dirty air cleaner will restrict air flow to the carburetor. To prevent carburetor malfunction, service the air cleaner regularly. Service more frequently when operating the generator in extremely dusty areas. p7iEE-l Never run the pump without the air cleaner. Rapid engine wear will result. 1. Unscrew the outer wing nut and remove the air cleaner cover. 2. Remove the inner wing nut and both elements. 3.
MAINTENANCE 5. Foam element cleaning: Wash the‘element in a solution of household detergent and warm water, then rinse thoroughly, or wash in nonflammable or high flash point solvent. Gasoline is highly flammable and explosive. You can be burned or seriously hurt. Never use gasoline to clean parts. Use a nonflammable solvent. Allow the element to dry thoroughly. Soak the element in clean engine oil and squeeze out the excess oil.
MAINTENANCE Spark Plug Service Recommended spark plugs: BPRGES (NGK), W20EPFbU (ND) To ensure proper engine operation, the spark plug must be properly gapped and free of deposits. Allow the engine to cool before servicing the spark plug. 1. Removethe spark Plug SPARKrLVU yyncp(~” Cap\ 2. Clean any dirt from around the spark plug base. 3. Use the wrench supplied to remove the spark plug. 4. Visually inspect the spark plug. Discard it if SPARK PLUG CAP the insulator is cracked or chipped.
MAINTENANCE 6. Check that the spark plug washer is in good condition, and thread the spark plug in by hand to prevent cross-threading. 7. After the spark plug is seated, tighten with a spark plug wrench to compress the washer. If installing a new spark plug, tighten 112turn after the spark plug seats to compress the washer. l If reinstalling a used spark plug, tighten l/8 - l/4 turn after the spark plug seats to compress the washer.
MAINTENANCE Fuel Filter 1. Drain the fuel into a suitable container and remove the gas tank. 2. Disconnect the fuel line, and unscrew the fuel filter from the tank. 3. Clean the filter with nonflammable solvent, and check that the filter screen is undamaged. Replace as necessary. 4. Clean the inside of the tank with nonflammable solvent and dry thoroughly. 5. Place the o-ring on the filter and install the filter in the tank. Tighten the filter to the specified torque.
MAINTENANCE Spark Arrester (optional part) Allow the muffler to completely cool before proceeding. 1. Remove the two 8 mm nuts 0 and remove the muffler from the cylinder. 2. Remove the four 5 mm screws Q from the muffler protector 0 and remove the muffler protector. @I 3. Remove the 4 mm screw @ from the spark arrester and remove the spark arrester 0 from the muffler. 4. Use a brush to remove carbon deposits from the spark arrester screen. Be carefull not to damage the spark arrester screen. 5.
TRANSPORTING/STORAGE TRANSPORTING/STORAGE This sections tells you how to safely transport your pump and how to properly store it.
TRANSPORTING/STORAGE Transporting When transporting the pump, be sure to keep it upright. If the pump is tilted or overturned, fuel may spill from the tank, which can result in a fire hazard. Allow the engine to cool before transporting the pump. 1. Turn the ignition switch to the OFF position. 2. Turn the fuel valve to the OFF position. 3. Drain the pump casing into a suitable container P by removing the pump D P drain plug.
TRANSPORTING/STORAGE Storage Before storing your pump for an extended period: 1. Be sure the storage area is free of excessive humidity and dust. PUMP DRAIN 2. Clean the pump interior by removing the pump drain plug PLUG and flushing with fresh water. After flushing, drain the water from the pump housing. 3.
TRANSPORTING/STORAGE 4. Drain the carburetor bowl. DRAIN SCREW a. With the fuel valve OFF, remove the carburetor drain screw. b. Drain the gasoline from the carburetor into a suitable container. c. If the tank is to be drained, turn the fuel valve ON and drain the fuel in the tank into a suitable container. d. Reinstall the drain screw and turn the fuel valve OFF. 5. Drain the fuel sediment cup. a. Turn the fuel valve to the OFF position. b. Remove the sediment cup and o-ring. c.
TRANSPORTING/STORAGE 6. Change the engine oil (see page 28). 7. Remove the spark plug, and pour about a tablespoon of clean engine oil into the cylinder. Crank the engine several revolutions to distribute the oil, then reinstall the spark plug. Pull the starter rope slowly until resistance is felt. Continue pulling until the arrow notch on the starter pulley aligns with the hole on the recoil starter (see illustration below). At this point, the intake and exhaust valves are closed.
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TROUBLESHOOTING TROUBLESHOOTING This section tells you what to look for if you encounter problems.
TROUBLESHOOTING Engine If the engine will not start: 1. Is the ignition switch ON? 2. Is there enough fuel? 3. Is the fuel valve ON? 4. Is gasoline reaching the carburetor? To check, remove the float bowl drain screw and turn the fuel valve ON. Fuel should flow out freely. 5. Check that the oil level is correct (see p. 10) 6. Is there a spark at the spark plug? a. Remove the spark plug cap. Clean any dirt from around the spark plug base, then remove the spark plug. b.
TROUBLESHOOTING Pump If the pump does not pump water: 1. Is the pump fully primed (see p. 19)? 2. Is the strainer clogged? 3. Are the suction hose bands installed securely (see p. 18)? 4. Is the suction hose connector washer installed (see p. 18)? 5. Is the suction hose damaged? 6. Is the suction head too high (see p. 21)? 7. If the pump still does not pump the water, take the pump to an authorized Honda water pump dealer.
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SPECIFICATIONS SPECIFICATIONS This section provides you with important dimensions and capacities.
SPECIFICATIONS WMP20X Dimension and Weight Length x Width x Height 520 x 400 x 450 min (20.5 x 15.7 x 17.7 in) Dry Weight 25.5 kg (56.2 Ibs) Enaine Engine Type Displacement 4-stroke, over head valve, single cylinder 163 cc (9.9 cu in) x 45 mm (2.7 x 1.8 in)] [bore x stroke] [68 Maximum output 5.
SPECIFICATIONS Pump Suction port diameter Discharge port diameter Rated rpm (maximum load) Total head Suction head Max discharge capacity Self-priming time 2 hrs 15 min Continuous running time Pump Performance Curve This graph shows the relationship between the pump discharge capacity and the total head. As you increase the total head, the discharge capacity will decrease.
SPECIFICATIONS Wiring Diagram 48
Additional Information Additional Information This section gives you sources for more information about your pump.
AdditionalInformation Honda Publications These publications will give you additional information about maintaining your pump. You may order them from your Honda water pump dealer. Shop Manual This manual covers complete maintenance and overhaul procedures, It is intended to be used by a skilled technician. Parts Catalog This provides a complete pictorial parts listing.
Additional Information CUSTOMER SERVICE INFORMATION Honda power equipment dealership personnel are trained professionals. They should be able to answer any question you may have. If you encounter a problem that your dealer does not solve to your satisfaction, please discuss it with the dealership’s management. The Service Manager or General Manager can help. Almost all problems are solved in this way.
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INDEX A Air Cleaner Clean ................. Inspect ............... .29 ..14 C Choke Lever ................. Component Location ............ Controls ................... Customer Service ............. 7 .6 .7 .51 D Discharge Hose ............... 19 E Engine Oil Change ................ Check ................. Engine Specifications ............. Engine Troubleshooting .......... .28 .10 46 .42 F Fuel Oxygenated ............... Recommendation ............ Refueling ................
INDEX I Ignition Switch . . . . . . . . . . . . , . . .8 L Liquid Pumping Recommendations . . . . . 20 M Maintenance Precautions . . . . . . . . . . 26 Maintenance Schedule . . . . . . . . . . . . 27 0 Oil Alert System . . . . . . . . . . . . . . . 8 Oil, Engine Change . . . . . . . . . . . . . . . . . 28 Check ,. . . . , . . . . . . . . . . . . . 10 P Pre-Operation Checks ............ Publications ................. Pump Performance ............. Pump Performance Curve ......... ................
INDEX S Safety Operating . . . Maintenance . Spark Arrester . . . Spark Plug . . . . . Specifications . . . . Starting Procedures Stopping Procedures Emergency . . Normal . . . . Storage Procedures Suction Hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 .26 .34 .31 .45 .22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
