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    Home » Milwaukee M18 BLSWP Stick Water Pump Instruction Manual
    Milwaukee

    Milwaukee M18 BLSWP Stick Water Pump Instruction Manual

    By Gabriel SmithSeptember 4, 2025Updated:November 28, 2025No Comments12 Mins Read
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    Milwaukee M18 BLSWP Stick Water Pump

    Milwaukee-M18-BLSWP-Stick-Water-Pump-Product

    Safety Instructions

    • Keep the work area clean and well-lit. Cluttered or dark areas invite accidents.
    • Keep children and bystanders away while operating a power tool.
    • Distractions can cause you to lose control.
    • Power tool plugs must match the outlet. Never modify the plug in any way.
    • Do not use any adapter plugs with earthed (grounded) power tools.
    • Unmodified plugs and matching outlets will reduce the risk of electric shock.
    • Do not expose power tools to rain or wet conditions.
    • Water entering a power tool will increase the risk of electric shock.
    • Do not abuse the cord. Never use the cord for carrying, pulling, or unplugging the power tool.
    • Keep the cord away from heat, oil, sharp edges, or moving parts.
    • Damaged or entangled cords increase the risk of electric shock.
    • When operating a power tool outdoors, use an extension cord suitable for outdoor use.
    • Use of a cord suitable for outdoor use reduces the risk of electric shock.
    • Stay alert, watch what you are doing, and use common sense when operating a power tool.
    • Do not use a power tool while you are tired or under the influence of drugs, alcohol, or medication.
    • A moment of inattention while operating power tools may result in serious personal injury.
    • Use personal protective equipment. Always wear eye protection.
    • Remove any adjusting key or wrench before turning the power tool on.
    • A wrench or a key left attached to a rotating part of the power tool may result in personal injury.
    • Do not overreach. Keep proper footing and balance at all times.
    • This enables better control of the power tool in unexpected situations.
    • Dress properly. Do not wear loose clothing or jewellery.
    • The use of dust collection can reduce dust-related hazards.
    • A careless action can cause severe injury within a fraction of a second.

    Use & Care

    • Do not force the power tool. Use the correct power tool for your application.
    • The correct power tool will do the job better and safer at the rate for which it was designed.
    • Do not use the power tool if the switch does not turn it on and off.
    • Any power tool that cannot be controlled with the switch is dangerous and must be repaired.
    • Disconnect the plug from the power source and/ or remove the battery pack, if detachable, from the power tool before making any adjustments, changing accessories, or storing power tools.
    • Such preventive safety measures reduce the risk of starting the power tool.
    • Maintain power tools and accessories. If damaged, have the power tool repaired before use.
    • Many accidents are caused by poorly maintained power tools.
    • Keep handles and grasping surfaces dry, clean, and free from oil and grease.

    Battery 

    • A charger that is suitable for one type of battery pack may create a risk of fire when used with another battery pack.
    • Recharge only with the charger specified by the manufacturer.
    • Use power tools only with specifically designated battery packs.
    • Use of any other battery packs may create a risk of injury and fire.
    • Under abusive conditions, liquid may be ejected from the battery; avoid contact.
    • If contact accidentally occurs, flush with water.
    • If liquid contacts the eyes, additionally seek medical help.
    • Liquid ejected from the battery may cause irritation or burns.
    • Do not use a battery pack or tool that is damaged or modified.
    • Damaged batteries may exhibit unpredictable behaviour, resulting in fire, explosion, or risk of injury.
    • Do not expose a battery pack or tool to fire or excessive temperature.
    • Exposure to fire or temperature above 265°F (130°C) may cause an explosion.
    • Follow all charging instructions and do not charge the battery pack or tool outside the temperature range specified in the instructions.
    • Charging improperly or at temperatures outside the specified range may damage the battery and increase the risk of fire.

    Description

    Milwaukee-M18-BLSWP-Stick-Water-Pump-Fig-1

    1. Battery door
    2. On/Off button
    3. Submersion line
    4. Coupler
    5. Lift tube
    6. HydroPass filter
    7. Handle support

    Operation

    To reduce the risk of injury, always wear proper eye protection marked to comply with AS/NZS 1337.1. Do NOT pump fluids such as petrol, fuel oil, or kerosene. This pump is designed for outdoor applications where water and organic debris (sticks, leaves, sand, gravel, and soil) might be present. It can also be used with clean and salt water, but must be flushed out afterwards to avoid damaging the tool.

    1. Remove the battery to avoid starting the tool.
    2. Ensure the HydroPass filter is properly installed. Do not operate without a filter installed.
    3. Inspect the filter and keep it clean and free of all foreign objects.
    4. Connect the hose to the pump.
    5. Lay out the hose to ensure there are no blockages, kinks, or bends.
    6. Take appropriate safety precautions to ensure the hose is secure for the worksite.
    7. The pump is not designed to sustain working in dry conditions.
    8. The pump will shut down if working in dry conditions for a long period.
    9. Insert the battery pack. Press and hold the power button to turn on the tool.
    10. As soon as the pump begins to take in air or pumping is complete, turn off the pump.
    11. To prevent backflow, remove the pump from the water before turning off.
    12. Flush the pump with clear water immediately after use to prevent any damage to the tool.
    13. Remove the battery and hose from the Milwaukee M18 BLSWP Stick Water Pump the pump.
    14. Let the pump and hose drain before storing.

    Assembly

    Recharge only with the charger specified for the battery. For specific charging instructions, read the operator’s manual supplied with your charger and battery.

    Inserting/Removing the Battery

    To insert the battery, slide the pack into the body of the tool. Make sure it latches securely into place. Only use accessories specifically recommended for this tool. Others may be hazardous. To remove the battery, push in the release buttons and pull the battery pack away from the tool. Always remove the battery pack anytime the tool is not in use.

    Installing the Coupler

    The coupler must be secured to connect the two halves before use. After initial assembly, keep the coupler secured at all times.

    1. Remove the battery to avoid starting the tool.
    2. Remove the shipping oil fill cap.
    3. Insert the end of each lift tube into the inner seal of the coupler. Adjust the electrical cord so that it curves to fit within the inner seal.
    4. Align the connection point of the lift tubes with the guide ridges on the bottom half of the coupler.
    5. Use a size H5 (5 mm) hex key to securely tighten the four screws.
    6. Line up the screws on the top half of the coupler with the bottom half of the coupler. Enclose the connection point.

    Removing/Installing the Hose Fitting

    1. Remove the battery to avoid starting the tool.
    2. To remove the hose fitting, twist the fitting anticlockwise and pull it away from the rest of the tool.
    3. To install the hose fitting, hand twist the fitting clockwise until it is fully connected with the rest of the tool. Do not overtighten.
    Connecting the Outlet Hose
    • Use a hose with a 3/4″-11.5 BSPT fitting. To prevent leaking, ensure the hose has a properly working O-ring in its fitting.
    • For best results, a heavy-duty hose should be used to prevent the hose from collapsing.
    • Use a short length, large diameter hose, such as a 1.8 m long, 18 mm inner diameter garden hose. Longer or thinner hoses may reduce performance and flow rate.
    • A regular garden hose may be used Milwaukee M18 BLSWP Stick Water Pump as an outlet hose.
    • Hand thread the outlet hose onto the pump’s hose fitting. Do not overtighten, or the threads may be damaged on the fitting or hose.

    Removing/Installing the Filter

    1. Remove the battery to avoid starting the tool.
    2. To remove the HydroPass™ filter (Cat. No. 22-06-0604), use a T20 screwdriver to loosen the fastening screw.
    3. Twist the filter anticlockwise and pull it away from the rest of the tool.
    4. To install the HydroPass™ filter, line the filter up at the end of the lift tube and hand twist the filter clockwise until it is fully connected with the rest of the tool.
    5. Do not overtighten. Use a T20 screwdriver to securely tighten the fastening screw.
    6. The HydroPass™ filter must be installed to use the pump.

    Maintainance

    To reduce the risk of injury, always unplug the Milwaukee M18 BLSWP Stick Water Pump charger and remove the battery pack from the charger or tool before performing any maintenance. Never disassemble the battery pack, charger, or tool, except as provided in these instructions. Contact a MILWAUKEE® service facility for ALL repairs.

    Maintaining Tool

    Keep your tool, battery pack, and charger in good repair by adopting a regular maintenance program. Inspect your tool for issues such as undue noise, misalignment, or binding of moving parts, breakage of parts, or any other condition that may affect the tool’s operation.

    Return the tool, battery pack, and charger to a MILWAUKEE® service facility for repair. After six months to one year, depending on use, return the tool, battery pack, and charger to a MILWAUKEE® service facility for inspection. If the tool does not start or operate at full power with a fully charged battery pack, clean the contacts on the battery pack. If the tool still does not work properly, return the tool, charger, and battery pack to a MILWAUKEE® service facility for repairs.

    Accidental Submersion 

    If the tool gets submerged past the handle

    1. Retrieve the tool from the water and immediately remove the battery pack.
    2. Lay the pump on a flat surface and allow it to self-drain for 24 hours before using it again.

    Cleaning

    Clean dust and debris from vents. Keep Milwaukee M18 BLSWP Stick Water Pump handles clean, dry, and free of oil or grease. Use only mild soap and a damp cloth to clean, since certain cleaning agents and solvents are harmful to plastics and other insulated parts. Some of these include petrol, turpentine, lacquer thinner, paint thinner, chlorinated cleaning solvents, ammonia, and household detergents containing ammonia. Never use flammable or combustible solvents around tools.

    Storage

    Never store with liquid inside the pump. To store the tool:

    1. Flush the HydroPass filter and lift tube Milwaukee M18 BLSWP Stick Water Pump with clear water after use to prevent any damage to the tool.
    2. Remove the hose and battery pack.

    To reduce the risk of personal injury and damage, never immerse a tool, battery pack, or charger in liquid or allow a liquid to flow inside them.

    Specifications

    • Cat. No: M18 BLSWP
    • Volts: 18 V DC
    • Battery Type:  M18™
    • Charger Type: M18™
    • Max Head Height: 5 m
    • Max Flow Rate: 94 LPM
    • Outlet size: 32 mm (1 ¼”) BSP Threaded
    • Hose fitting size: 18 mm (3/4”) x 2
    • HydroPass Filter Cat. No: 22-06-0604
    Application
    • Recommended Ambient Operating Temperature:  -17°C to 51°C
    • Max Water Temperature: 60°C (140°F)
    • Max Air Temperature: 60°C (140°F)

    Troubleshooting

    Problem Cause Correction
    The pump will not run. The HydroPass™ filter is not attached. See “Removing/Installing the HydroPass”.
    The flow rate is too low. The hose is clogged or damaged. The HydroPass filter is clogged with debris. Flush the hose, or replace the hose if damaged. Clean the HydroPass filter.
    Pump shutdown. Dry pump shutdown. Correct the situation, then turn the pump off, then back on to reset.
    Over-temperature shutdown Blocked hose line.

    Hose line too high.

    Hose line too long.

    Pump ON for too long.

    Correct the situation, then turn the pump off, then back on to reset.

    Allow the pump to cool.

    Federal Communications Commission

    This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used according to the instructions, may cause harmful interference Milwaukee 3154-20 M12 75 Drain Camera to radio communications. However, there is no guarantee that interference will not occur in a particular installation.

    • Reorient or relocate the receiving antenna.
    • Increase the separation between the equipment and receiver.
    • Consult the dealer or an experienced radio/TV Milwaukee 3154-20 M12 75 Drain Camera technician for help. This device complies with part 15 of the FCC Rules and ISED-Canada’s license-exempt RSS standards.
    • This device may not cause harmful interference.
    • This device must accept any interference received, including interference that may cause undesired operation.

    Limited Warranty

    USA & CANADA

    This MILWAUKEE power tool* is warranted to the original purchaser from an authorised MILWAUKEE distributor only to be free from defects in material and workmanship.

    Normal Wear

    This warranty applies to products sold in the U.S.A. and Canada only. Please consult the ‘Service Centre Search’ in the Parts & Service section of MILWAUKEE’s

    Customer Support

    • Website:  http://www.milwaukeetool.com
    • Ph:  1.800.729.3878
    • Monday-Friday:  7:00 AM – 6:30 PM CST

    FAQs

    Q: What type of battery does it use?

    All Milwaukee M18TM REDLITHIUMTM batteries are compatible with it. Use HIGH OUTPUTTM batteries, like the M18TM REDLITHIUMTM XC 6.0Ah or HD 12.0Ah packs, for optimal performance and runtime.

    Q: How much water can it pump per charge?

    Battery capacity and application determine performance. Under ideal circumstances, the pump’s M18TM HIGH OUTPUT XC 8.0Ah battery can move up to 2,000 gallons (7,570 litres) of water on a single charge.

    Q: Can the pump run dry?

    No, don’t run the pump without water since this could lead to overheating and impeller damage.

    Q: What is the maximum water temperature the pump can handle?

    Avoid pumping hot liquids or water above this temperature threshold.

    Q: Can I use the pump to remove water from tight spaces?

    Indeed. Its small size and detachable filter make it perfect for use on a job site or in an emergency.

    Q: Does the pump automatically shut off when water runs out?

    Indeed. In order to minimise dry running and safeguard the motor, the M18 BLSWP has an AUTO-STOPTM sensor that senses when water flow stops and instantly turns off the pump.

    Milwaukee battery powered stick pump Milwaukee cordless stick pump Milwaukee M18 BLSWP pumping system Milwaukee M18 BLSWP stick water pump Milwaukee M18 water transfer pump Milwaukee portable water pump
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    Gabriel Smith

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