8 Components for Setting Up a UTV Sprayer for Weed Control

Managing invasive weeds across a small farm or homestead requires a setup that is both highly mobile and incredibly precise. Rigging a Utility Terrain Vehicle (UTV) with a dedicated sprayer system allows you to cover pastures, fence lines, and orchards without the physical toll of a backpack sprayer. By selecting the right individual components, you can build a reliable, custom rig that targets weeds effectively while conserving expensive chemical herbicides.

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Planning Your UTV Sprayer Setup for Weed Control

Throwing a generic, pre-assembled sprayer into the back of a UTV often leads to frustration when cheap hoses kink or underpowered pumps fail to reach the edge of a pasture. Planning a custom setup lets you select high-grade components tailored to your specific acreage, terrain, and weed pressure. A well-designed rig balances weight distribution, electrical draw, and spray width to ensure uniform chemical application.

Before buying any parts, measure the UTV cargo bed and check its payload capacity. A gallon of water weighs approximately 8.34 pounds, meaning a 45-gallon tank will add nearly 400 pounds of sloshing weight to the vehicle. Ensure the UTV’s alternator can handle the continuous amperage draw of a 12-volt pump without draining the battery during slow-speed spraying.

Sprayer Tank – Fimco 45-Gallon UTV Tank

The sprayer tank is the foundation of the entire rig, holding the water and chemical mixture securely as you navigate uneven pasture terrain. A poor tank design can shift your center of gravity or leave gallons of expensive chemical trapped in the bottom corners. The Fimco 45-Gallon UTV Tank is specifically molded to sit low in standard UTV cargo beds, reducing the risk of vehicle rollovers on side slopes.

This tank features thick, UV-stabilized polyethylene walls that resist cracking under intense sunlight and harsh chemical exposure. It includes a molded-in drain sump at the bottom, which ensures almost every drop of liquid reaches the pump rather than pooling uselessly. Molded-in pockets and tie-down slots make securing the tank straightforward without risking damage to the plastic.

Before purchasing, verify that your UTV tailgate can close with this footprint, which measures roughly 36 inches wide by 24 inches deep. This tank is ideal for hobby farmers managing 2 to 10 acres of pasture or orchard floor. It is not suitable for those with sub-compact UTVs with tiny cargo beds, where a smaller 25-gallon tank would be safer.

• Compatible Uses: Broadleaf weed control in pastures, orchard floor maintenance, fence line spraying.
• Key Dimensions: 36" L x 24" W x 20" H.
• Capacity: 45 Gallons.

Diaphragm Pump – Remco Professional 12V Pump

The pump is the heart of the sprayer system, responsible for drawing liquid from the tank and pushing it through the boom or spray gun at a consistent pressure. A weak pump will result in uneven spray patterns, while a low-quality model will quickly dissolve when exposed to corrosive herbicides. The Remco Professional 12V Diaphragm Pump (5.3 GPM, 100 PSI) provides the heavy-duty performance needed to run both a multi-nozzle boom and a hand gun simultaneously.

Built with a chemically resistant Santoprene diaphragm and Viton valves, this pump shrugs off the corrosive effects of common herbicides like glyphosate and 2,4-D. Its demand-switch design automatically shuts the motor off when the spray gun trigger is released, conserving battery life and reducing wear on the pump motor. The 5.3 GPM capacity ensures you have plenty of volume to feed a wide boom without losing pressure.

Keep in mind that this pump draws up to 13 amps under full load, so wiring it directly to the UTV battery with a fused harness is highly recommended. This pump is perfect for landowners who need to run booms wider than 5 feet or require high pressure for spot-spraying tall brush. It is overkill for tiny, single-nozzle spot sprayers that only require a basic 1.0 GPM pump.

• Flow Rate: 5.3 Gallons Per Minute (GPM).
• Max Pressure: 100 PSI.
• Best For: Multi-nozzle spray booms, high-reach spray guns, dual-line setups.

Spray Boom – Chapin 7-Foot No-Drip Boom

For covering open pastures, riding arenas, or long driveways, a spray boom is essential to achieve uniform coverage in a single pass. Trying to coat a field using only a handheld wand leads to missed patches and wasted chemicals. The Chapin 7-Foot No-Drip Folding Boom offers a wide coverage path while remaining compact enough to navigate through standard farm gates.

This steel boom features a folding hinge design that allows the outer wings to swing back if they strike an obstacle like a fence post or tree trunk. The integrated no-drip diaphragm check valves instantly stop the flow of liquid when the pump is turned off, preventing chemical puddles from burning your grass. It comes equipped with high-quality fan nozzles that provide a consistent, overlapping spray pattern across its entire width.

Installing this boom requires a sturdy mounting bracket attached to your UTV’s rear bumper or receiver hitch. You must adjust the boom height so the spray patterns overlap slightly above the weed canopy, typically about 18 to 20 inches. This boom is a perfect fit for landowners with open pastures, but it is not recommended for heavily wooded trails where a boomless nozzle setup would be less prone to snagging.

• Coverage Width: 7 Feet (84 inches).
• Nozzle Type: Low-drift flat fan.
• Best For: Open pastures, riding arenas, and wide field margins.

Spray Gun – TeeJet GunJet AA30L Spray Gun

While a boom handles wide-open spaces, a reliable spray gun is necessary for spot-treating noxious weeds along fence lines, around barns, and under low-hanging trees. Cheap plastic spray wands frequently leak at the trigger, dripping concentrated chemicals onto your hands and boots. The TeeJet GunJet AA30L Spray Gun is an industrial-grade tool designed for precision spot application and long-term durability.

Featuring a heavy-duty brass body and stainless steel valve stem, this spray gun can withstand operating pressures up to 250 PSI without weeping. The ergonomic trigger lock reduces hand fatigue during long spraying sessions, allowing you to focus on targeting specific weeds. It accepts standard TeeJet spray tips, meaning you can easily swap nozzles to change from a fine mist for foliage to a solid stream for reaching distant brush.

Note that this gun does not come with a hose swivel, which is a highly recommended accessory to prevent the supply hose from twisting and kinking during use. It is the gold standard for anyone who spends hours spot-spraying thistles, briars, or woody brush. It may be too heavy and expensive for casual gardeners who only need to spray a few weeds along a gravel driveway.

• Max Pressure: 250 PSI.
• Material: Heavy-duty brass and stainless steel.
• Best For: Targeted fence line spraying, brush control, and spot-treating invasive weeds.

Pressure Regulator – Valley Industries Valve

A high-pressure pump will quickly damage your system or apply chemicals too heavily without a reliable way to regulate the flow. A pressure regulator bypasses excess liquid back into the tank, allowing you to fine-tune the exact operating pressure of your boom and spray gun. The Valley Industries Pressure Regulator Valve with an integrated pressure gauge is the ideal control center for a custom UTV rig.

This regulator features a durable manual adjustment knob that makes it simple to dial in the exact PSI required for your specific spray nozzles. The integrated bypass port diverts excess flow back to the tank, which also acts as a useful agitator to keep your chemical mixture thoroughly blended. Its clear, liquid-filled pressure gauge resists the vibrations of UTV travel, providing steady, accurate readings on the go.

When plumbing this regulator, ensure the return line to the tank is completely unrestricted to prevent backpressure buildup. This component is absolutely essential for anyone running a multi-nozzle boom where precise pressure control dictates application rates. It is not necessary for simple, low-pressure spot-spraying setups that rely solely on a pump’s internal demand switch.

• Inlet/Outlet Ports: 3/4-inch NPT.
• Pressure Range: 0 to 150 PSI.
• Best For: Boom systems requiring constant pressure bypass and tank agitation.

Spray Hose – Apache 3/8-Inch PVC Ag Hose

The hose connecting your pump, regulator, and spray gun must withstand high pressure, constant flexing, and exposure to harsh agricultural chemicals. Standard garden hoses or cheap vinyl tubing will quickly soften, kink, or burst under pressure, creating dangerous chemical spills. The Apache 3/8-Inch PVC Agricultural Spray Hose is built specifically to handle the rigors of mobile chemical application.

Reinforced with high-tensile yarn, this hose boasts an 800 PSI burst pressure rating, ensuring it easily handles any pressure spikes your pump can produce. The bright yellow PVC cover is highly visible in the field, reducing the risk of accidentally running over it with your UTV. It remains remarkably flexible even in cool morning temperatures, making it easy to unspool and coil back up.

For a UTV setup, a 30- to 50-foot length of this hose provides the perfect balance of reach and storage convenience when paired with a simple hose wrap. Ensure you use high-quality brass hose barbs and worm-gear clamps to secure all connections tightly. This hose is perfect for rugged farm use, but its stiffness makes it overkill for short, stationary plumbing lines inside the UTV bed.

• Inside Diameter: 3/8-inch.
• Working Pressure: 800 PSI.
• Best For: Handheld spray guns, hose reel assemblies, and long-reach spot spraying.

Spray Nozzle – TeeJet AIXR Flat Fan Nozzle

The nozzle is the final, most critical point of the sprayer system, determining both the droplet size and the distribution pattern of your herbicide. Standard nozzles often produce tiny droplets that easily drift on the wind, wasting chemical and risking damage to nearby desirable plants. The TeeJet AIXR Flat Fan Nozzle uses air-induction technology to produce larger, drift-resistant droplets that stick to weed foliage.

This nozzle features a 110-degree wide angle flat fan spray pattern, which allows you to mount the boom lower to the ground to further reduce wind drift. The polymer construction offers excellent wear life and chemical resistance, ensuring the nozzle orifice remains precise over seasons of use. By mixing air into the liquid stream, it creates medium-to-coarse droplets that explode upon hitting the leaf surface, providing excellent coverage without misting.

You will need to select the correct nozzle size (indicated by color-coding) based on your target travel speed and application rate in gallons per acre. Never use a metal wire or pin to clean a clogged nozzle, as this will ruin the precision-molded orifice; use a soft-bristled toothbrush instead. These nozzles are a must-have for spraying near sensitive garden beds or windbreaks, but they are not suited for high-pressure washing or blasting dense brush.

• Spray Angle: 110 Degrees.
• Droplet Size: Coarse to very coarse (drift-resistant).
• Best For: Broadleaf herbicide application in windy or sensitive areas.

Tie-Down Straps – Keeper Heavy Duty Ratchet Straps

A 45-gallon tank filled with liquid creates a massive amount of shifting kinetic energy as you drive over bumps, ruts, and hills. Failing to secure the tank properly can result in it sliding, tipping, or spilling chemical all over your vehicle’s engine bay and the ground. Keeper Heavy Duty Ratchet Straps provide the strength and reliability needed to lock the heavy tank securely into your UTV bed.

These straps feature 2-inch wide Hi-Test webbing and heavy-duty steel ratchet buckles that allow you to tension the straps precisely. The rubber-coated hooks prevent damage to your UTV’s tie-down anchors and the tank’s molded plastic slots. With a working load limit of over 1,000 pounds, these straps easily handle the violent forces of sloshing water during sudden stops or sharp turns.

When securing a plastic tank, tighten the straps until they are snug, but avoid over-tensioning, which can deform or crack the polyethylene shell, especially in hot weather. Inspect the webbing regularly for fraying or chemical degradation, replacing them at the first sign of wear. These straps are essential for any UTV-mounted tank setup, whereas cheap, thin bungee cords or light-duty cam straps are highly dangerous compromises.

• Strap Width: 2 Inches.
• Working Load Limit: 1,100 lbs (3,300 lbs break strength).
• Best For: Securing liquid tanks, heavy machinery, and cargo in UTV beds.

How to Calibrate Your UTV Sprayer for Accuracy

Calibration is the process of matching your sprayer’s output to your vehicle’s speed to ensure you apply the exact recommended amount of herbicide per acre. Applying too little chemical results in poor weed control and wasted time, while applying too much wastes expensive product and can damage your soil or pasture grasses. To begin, measure a test distance of 122 feet, which represents 1/340th of an acre when using a nozzle spacing of 20 inches.

Drive your UTV through the test course at your target spraying speed (usually between 3 and 5 miles per hour) and record the exact time in seconds it takes to cover the distance. Next, park the UTV, set your pressure regulator to your target operating PSI, and catch the output from a single nozzle in a measuring cup for that exact number of seconds. The number of fluid ounces collected directly equals the application rate in gallons per acre (GPA).

If your target rate is 20 GPA and you collected 24 ounces, you must either increase your travel speed slightly or lower the system pressure to reduce the output. Repeat this test until the collected ounces match your desired GPA rating. Write these settings (speed, gear, RPM, and PSI) down on a card and tape it to the UTV dashboard for quick reference during the spraying season.

Safe Chemical Handling and Drift Prevention Tips

Handling concentrated agricultural chemicals requires strict adherence to safety protocols to protect both the operator and the local ecosystem. Always wear the recommended Personal Protective Equipment (PPE), including chemical-resistant gloves, safety goggles, long sleeves, and closed-toe boots, when mixing and loading herbicides. Mix your chemicals on a concrete pad or a designated area away from wells, creeks, and vegetable gardens to prevent accidental contamination.

Drift prevention is largely a matter of timing and weather observation. Never spray when wind speeds exceed 10 miles per hour, or when the air is completely still, as a temperature inversion can trap tiny droplets and carry them miles away to damage sensitive crops. Keep your boom height as low as possible while still maintaining proper spray pattern overlap, and spray during the cooler parts of the day to reduce chemical volatilization.

When mixing chemicals into the Fimco tank, always fill the tank half full with clean water first, add the chemical, and then fill the remaining volume with water. This order ensures proper mixing and prevents concentrated chemicals from sitting directly in the pump intake line. Keep a clean bucket of fresh water mounted to the UTV for emergency hand-washing in case of accidental chemical contact.

Maintenance and Winterizing Your Sprayer System

A custom UTV sprayer is a significant investment that can easily last for a decade if properly maintained after every use. Herbicide residues left inside the pump, valves, and nozzles will dry, harden, and clog the system, or worse, corrode the delicate internal components. After each spraying session, perform a triple-rinse procedure by flushing the system with clean water, followed by a tank cleaner solution, and a final clean water rinse.

Pay special attention to the pump’s inlet strainer, removing the bowl and cleaning out any debris or sediment that has accumulated during operation. Remove the nozzle tips and check valves, soaking them in a bucket of soapy water and blowing them clean with compressed air rather than poking them with wire. Store the spray gun and hose out of direct sunlight to prevent UV degradation of the rubber and plastic components.

Before the first winter freeze, you must completely winterize the system to prevent ice from cracking the pump housing, regulator, and valves. Drain the tank completely, then pour two gallons of non-toxic RV antifreeze into the tank and run the pump until the colored fluid flows out of the boom nozzles and the spray gun. This simple step ensures that any trapped water is replaced with antifreeze, protecting your custom rig until the next spring weed control season.

Building a custom UTV sprayer with high-quality, matched components ensures your weed control efforts are both efficient and highly effective. By taking the time to calibrate your system and maintain it properly, you protect your investment and your land. With this robust setup in your utility vehicle, tackling tough pasture weeds becomes a manageable, precise, and even satisfying farm chore.