My 4 Sons M4 Battery Powered Backpack Sprayer – Key Features
Easy to Use: The large wide opening of the M4 allows for easy filling and adds a filter to eliminate dirt from water tank. On/Off and flow switches are available while the system is running and indicator lights let you know when it’s time to charge the battery.
Versatile – Works with Many Solutions/Chemicals: The M4 pump easily pumps a wide range of natural and synthetic fluids, such as acids, bleach, solvents, and chemicals. This ranges from lawn fertilizer and weed killers like Roundup to cleaning products like Wet and Forget, fence and deck stains, concrete sealants like LastiSeal, diesel, oil, de-icers, alcohol, mineral spirits, and much more.
Manual Pump vs Battery Operated: The spray time is cut in half, compared to manual sprayers! The M4’s large capacity sprays up to 200 gallons on a single charge. That’s equivalent to 50 tankfulls with a manual sprayer.
Battery Life: A fully self-sufficient, automatic charger is included in the backpack of each model that reaches a full charge in eight hours or less. The charger can switch gradually from the fast-charging to full-charge mode to conserve battery life and does not require special residential or commercial outlets. It can be used year-round.
Built to Last: To maintain the M4 in good working order, be sure to perform routine maintenance, including replacing the motor and battery every few years and thoroughly cleaning the machine. In doing this, your sprayer will last for decades.
Safety Features: The M4’s locking trigger prevents accidental spraying while heavy-duty shoulder straps are bolted to the sprayer to prevent accidental disconnection and/or dropping. The M4 is also much safer than manual sprayers if you need to climb ladders because it leaves one hand free to hold on.
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Upgrades to the M4 Sprayer
In 2021 the company upgraded the sprayer with the following features:
- Triple thick XXL shoulder pads
- Organizer pockets for wands and accessories
- Quick change battery compartment,
- Never leak lid
- Quick release strain relief hose
My4Sons M4 Sprayer Uses
- Pesticides – to get rid of the bugs that are bugging you
- Herbicides – get rid of those unwanted weeds
- Paint
- Concrete Sealant
- Bleach
- Not recommended for staining
You must clean the sprayer before switching solutions. Simply run a minimum of 1 gallon of water through the sprayer to ensure that it is clean.
Never store your sprayer with chemicals inside.
M4 system is not compatible with muriatic acid.
Battery
The battery will last 4-5 hours on a single charge.
The recharge of your battery will take roughly 8 hours.
The charger automatically switches from full charge to trickle and can be left plugged in all year long to optimize the battery life.
Spray Distance
Depending on the nozzle you chose, the My 4 Sons M4 sprayer can spray up to 30 feet.
Perfect for the DIYer or the industry professional, the M4 Basic System includes:
- Translucent tank with large-mouth opening for easy filling and screen filter to protect against dirt/debris
- Deep seal between the tank and lid
- Heavy-duty, reinforced hose for high temperature and high pressure
- Heavy duty, extra-long adjustable length stainless-steel wand with tip for precision application
- Heavy-duty plastic wand with durable connectors for applying acid or bleach-based products
- Adjustable brass nozzle
- Compatibility with a wide range of nozzles
- One-piece valve handle for improved reliability and ergonomics
- Heavy-duty shoulder straps to prevent disconnection and dropping
- Locking trigger and on/off switch that’s accessible during wear for improved ergonomics
- New and improved quick-access battery door
- 10amp inline fuse integrated with the charge plug
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My 4 Sons M4 Trouble Shooting Guide
| Problem | Possible Cause | Solution |
|---|---|---|
| Pump continues running even when valve is closed and tank is full | Pump diaphragm is not priming | Prime the pump by spraying the garden hose into the tank fine filter inlet while the unit is on. |
| Intermittent power | Bad battery connection or bad red piston in trigger | Verify whether the problem is electrical by lightly tapping the unit on the table while it is on. If the voltmeter lights flicker, it confirms that it’s an electrical issue. Tighten the battery spring plate screws, bend J2’s up and spring plates down, check for loose wires/bad bundle connections, make sure the bottom plate is screwed in tightly, and replace plastic valve trigger handle red piston. |
| Battery not charging (charger light stays green/amber when plugged into base) | No battery connection | Verify whether there is no light on the charger by unplugging AC (leave charger plugged into base). If there is no light on the charger, the bad battery connection is confirmed. Tighten the battery spring plate screws, bend J2’s up and spring plates down, check for loose wires/bad bundle connections. |
| No power, no voltmeter lights | Multiple electrical issues, but usually just one | To find the root cause, connect the charger to the M4 charger panel (base only-do not connect the AC plug into 110 vac) and observe charger LED. If light is not illuminated, the battery is not connected and root cause items 1-3 and 6 (battery continuity, wire terminal bundles, and battery power) need to be checked. Alternatively, if the LED is illuminated, the battery is connected. Leaving the charger plugged into the base, connect the AC plug side of the charger into an AC 110V wall outlet and turn on the unit using only the rotary switch, slowly rotating clockwise. If none of the voltmeter lights on the base illuminate and the pump does not activate, items 4,5,7, and 8 need to be checked (rotary, fuse, pump, red switch). To eliminate 6 and 7 (the battery and pump) as the cause, connect the pump +- wires directly to the battery. If the pump stirs, both the battery and the pump are good. If this occurs, the most likely culprit is the rotary switch, and it must be assumed that the fuse is also blown. The rotary switch can be verified by directly connecting both switches to the pump (parallel). If the red (toggle switch) turns on the pump and voltmeter, but the rotary does not, the silver rotary switch is the root cause. If the rotary turns on the unit and the red does not, the red switch is the culprit. |
| No power, but voltmeter lights on | Backpressure on the pump (hose, valve, wand, nozzle blockage), possible operator error (forgot to pull trigger to activate pump), bad pump | If removing the hose (relieving back pressure) is not the solution, perform the battery to pump direct test for pump verification. If removing the hose from the end of the pump results in pump activation, verify that the user understands the M4 pump is on demand (operator error), or test for blockages by progressively removing the nozzle, wand, and valve. Replace valve O-ring piston if traced to valve. |
| Plugged 110 VAC into charger port instead of 12 Vdc from factory charger | Original charger lost, AC cord assumed to work | Trace all burned wires to components, replace components. |
| Red flashing charge light, voltage |
