{"product_id":"dji-agras-t40-ball-seal-spring-5-pcs-replenishment-monthly-program","title":"DJI Agras T40 Ball Seal Spring (5 Pcs) Replenishment (Monthly Program)","description":"\u003cp\u003e\u003cstrong\u003eDJI Agras T40 Ball Seal Spring | Spray Nozzle Check Valve Spring | 5-Piece Genuine OEM Pack | Monthly Replenishment Program\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🇺🇸 U.S.A. FIRST\u003c\/h2\u003e\n\u003cp\u003eAres Acres LLC is a U.S.-based authorized DJI Agras reseller supporting American agricultural drone operators with genuine DJI Agras OEM replacement parts, accessories, and field-ready inventory.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFREE \u0026amp; FAST Shipping is included for all U.S. customers.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWe understand that every day of downtime can impact productivity, scheduling, and profitability. That's why we focus on providing fast fulfillment, responsive customer support, and reliable access to the parts operators need most.\u003c\/p\u003e\n\u003cp\u003eInside every T40 spray nozzle check valve sits a small spring holding the check-valve ball seated against the seal so the nozzle snaps shut the instant the pump stops. When springs fatigue, nozzles keep dripping after shutoff — chemical landing where it was never meant to go. They fatigue with every pressurization cycle while pesticide and fertilizer chemistry attacks them, and T40 fleets replace them nozzle by nozzle all season long.\u003c\/p\u003e\n\u003cp\u003eThat is the economics this program exists to fix. Instead of paying the one-time 5-pack price mid-season while nozzles drip, a fresh pack of 5 genuine DJI OEM ball seal springs ships automatically every month for a recurring monthly program fee — not a one-time purchase price.\u003c\/p\u003e\n\u003cp\u003eEvery spring is yours to keep, there is no minimum term, cancel anytime, and free U.S. shipping is included on every cycle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEnroll using the purchase option above — current pricing is shown there. Cancel anytime.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFor professional farmers, aerial applicators, and commercial drone operators, this program is nozzle discipline on autopilot.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWe use specialized technicians to verify and dispatch the Ball Seal Spring (5 Pcs) Replenishment ordered.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eParts like this one are the reason a grounded aircraft is a repair and not a write-off. A single component held in U.S. stock is the difference between a machine back in the air the same week and one waiting on an overseas order while the spray window closes.\u003c\/p\u003e\n\u003cp\u003eThat is why Ares Acres keeps hard-to-find OEM seals \u0026amp; vent hardware in stock and shipped fast within the U.S.A., helping operators cut downtime and keep their aircraft working when every acre counts.\u003c\/p\u003e\n\u003cp\u003eFor professional farmers, aerial applicators, and commercial drone operators running the DJI Agras T40, this is the part that keeps a scheduled job on the calendar instead of on hold.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e✅ DJI Agras T40 Compatibility Guarantee\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e🇺🇸 USA Compatibility Guarantee\u003c\/li\u003e\n\u003cli\u003e👍🏻 Satisfaction Guarantee\u003c\/li\u003e\n\u003cli\u003e💵 Money Back Guarantee\u003c\/li\u003e\n\u003cli\u003e📦 Same Day Shipping \u0026amp; Tracking\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e📦 Package Includes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × pack of 5 genuine DJI Agras T40 OEM Ball Seal Springs — shipped automatically every month\u003c\/li\u003e\n\u003cli\u003eOEM protective packaging on every cycle\u003c\/li\u003e\n\u003cli\u003eRecurring monthly program fee billed at the price shown above — not a one-time purchase price\u003c\/li\u003e\n\u003cli\u003eEvery spring delivered is yours to keep\u003c\/li\u003e\n\u003cli\u003eNo minimum term — cancel anytime and keep everything already shipped\u003c\/li\u003e\n\u003cli\u003eFREE U.S. shipping with tracking on every shipment\u003c\/li\u003e\n\u003cli\u003eEnrollment through the purchase option above — current pricing is shown there\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e🔧 Component Overview\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eDJI Agras T40 Ball Seal Spring\u003c\/strong\u003e is the genuine DJI OEM spring inside the T40's spray nozzle check valves, keeping the ball pressed against its seal so the nozzle opens cleanly under pressure and closes completely the moment pressure drops.\u003c\/p\u003e\n\u003cp\u003eThe ball seal spring provides:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePositive ball seating against the seal\u003c\/li\u003e\n\u003cli\u003eInstant nozzle shutoff when the pump stops\u003c\/li\u003e\n\u003cli\u003eDrip-free line holding between passes\u003c\/li\u003e\n\u003cli\u003eClean spray starts on each swath\u003c\/li\u003e\n\u003cli\u003eConsistent valve opening pressure\u003c\/li\u003e\n\u003cli\u003eUniform application nozzle to nozzle\u003c\/li\u003e\n\u003cli\u003eProtection against uncontrolled dribble\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCommercial agricultural drones cycle hard every day, including through:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCrop spraying missions\u003c\/li\u003e\n\u003cli\u003eHigh-tempo fill-and-fly cycles\u003c\/li\u003e\n\u003cli\u003ePump start-stop cycling at every headland turn\u003c\/li\u003e\n\u003cli\u003eLong-duration spraying campaigns\u003c\/li\u003e\n\u003cli\u003eMulti-aircraft fleet operations\u003c\/li\u003e\n\u003cli\u003eHigh-acreage contract work\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThroughout these operations, ball seal springs are routinely exposed to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFatigue loading on every pressurization cycle\u003c\/li\u003e\n\u003cli\u003ePesticide chemistry attacking the metal\u003c\/li\u003e\n\u003cli\u003eFertilizer solutions and corrosive tank mixes\u003c\/li\u003e\n\u003cli\u003eAdjuvants and surfactant blends\u003c\/li\u003e\n\u003cli\u003eAbrasive particles in the spray solution\u003c\/li\u003e\n\u003cli\u003ePressure spikes at pump start\u003c\/li\u003e\n\u003cli\u003eCleaning and flushing chemicals\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA fresh, full-tension spring helps maintain:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNozzles that seal completely at shutoff\u003c\/li\u003e\n\u003cli\u003eDrip-free headland turns and hovers\u003c\/li\u003e\n\u003cli\u003eEven application across the boom\u003c\/li\u003e\n\u003cli\u003eChemical staying where it was prescribed\u003c\/li\u003e\n\u003cli\u003eCrops protected from stray dribble\u003c\/li\u003e\n\u003cli\u003eMaximum aircraft uptime\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor operators applying chemistry over paying acreage, fresh springs are non-negotiable.\u003c\/p\u003e\n\u003cp\u003eBefore replacing anything, find out whether the drip is the spring or the seat it closes against. Park the aircraft level with liquid still in the tank and the system unpressurized, wipe each nozzle dry, and lay clean dry cardboard under it. Static head from the tank alone should not get past a healthy check valve. A nozzle that puts a wet ring on the cardboard while nothing is running has a valve that is not sealing, and now you know which position to open.\u003c\/p\u003e\n\u003cp\u003eThat test tells you which nozzle, not which part, and a swap answers the rest in five minutes. Move the suspect spring into a position that stayed dry, put that position's spring into the leaker, and repeat the static test. If the leak follows the spring, the spring has lost preload or taken a permanent set. If the leak stays with the position, the ball, the seat, or the sealing face is damaged and a new spring will not fix it.\u003c\/p\u003e\n\u003cp\u003eCompare removed springs against a new one on the bench rather than by feel. Stand them upright side by side on the same flat surface and sight across the tops; a spring that has taken a set sits visibly lower. Then compress each one between finger and thumb against the new one and watch the effort before the coils close up. Loss of preload is obvious in that comparison. A spring that stands full height and still resists properly points you at the seat instead.\u003c\/p\u003e\n\u003cp\u003eLook for what is holding the ball off its seat besides a tired spring. One grain of grit, a flake of dried tank mix, or a fertilizer crystal grown between the coils will hold a valve open with a sound spring in it. Roll the ball across a clean flat surface and watch for a wobble or a dull band where it has been seating. Run a fingernail around the seat. A groove you can feel is a leak path no amount of spring pressure will close.\u003c\/p\u003e\n\u003cp\u003eTiming separates a real leak from normal drain down. After shutoff the liquid standing in the line above a nozzle has to go somewhere, and a few seconds of run off is not a fault. A fault is a nozzle still releasing liquid minutes later while the machine sits, or one that drips harder the fuller the tank is. Weeping that tracks tank level is preload no longer strong enough to hold back the head of liquid above it.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e⚙️ Functional Purpose\u003c\/h2\u003e\n\u003cp\u003eThe ball seal spring makes the T40's check valves decisive: fully open under pressure, fully closed without it. The program keeps the springs doing that job from ever being past their prime.\u003c\/p\u003e\n\u003cp\u003eThe program helps:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHold the check-valve ball seated against the seal\u003c\/li\u003e\n\u003cli\u003eShut nozzles off instantly when the pump stops\u003c\/li\u003e\n\u003cli\u003ePrevent post-shutoff dripping and dribble\u003c\/li\u003e\n\u003cli\u003eMaintain uniform application across every nozzle\u003c\/li\u003e\n\u003cli\u003ePrevent chemical waste between passes\u003c\/li\u003e\n\u003cli\u003eReduce crop-damage risk from dribble\u003c\/li\u003e\n\u003cli\u003eReplace fatigued springs before they leak\u003c\/li\u003e\n\u003cli\u003eKeep a rolling spring stock in your inventory\u003c\/li\u003e\n\u003cli\u003eTurn a season-long consumable into automatic delivery\u003c\/li\u003e\n\u003cli\u003eKeep aircraft spraying when every acre counts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWorn or fatigued ball seal springs may contribute to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNozzles dripping after pump shutoff\u003c\/li\u003e\n\u003cli\u003eUneven application across the boom\u003c\/li\u003e\n\u003cli\u003eChemical waste between passes\u003c\/li\u003e\n\u003cli\u003eCrop damage from uncontrolled dribble\u003c\/li\u003e\n\u003cli\u003eStreaking and inconsistent coverage\u003c\/li\u003e\n\u003cli\u003eInaccurate application-rate accounting\u003c\/li\u003e\n\u003cli\u003eInterrupted missions for nozzle service\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFresh springs restore the instant shutoff the system was engineered around.\u003c\/p\u003e\n\u003cp\u003eFlush before you open anything. Run clean water through the spray system until it runs clear, relieve pressure, and drain, because what stands inside a closed check valve is concentrated product and you are about to put your hands in it. Gloves and eye protection are not optional here, and the rinse water goes in a container, not on the yard where the aircraft parks.\u003c\/p\u003e\n\u003cp\u003eWork over a tray or a folded shop towel, never over grass, gravel, or an open floor drain. A check ball and its spring are among the smallest loose parts on the aircraft and both launch the moment a retainer releases. Lay the pieces out left to right in the order they came apart and photograph the stack before disturbing the last one. Which end of the spring bore against the ball is not obvious once it is loose in a tray.\u003c\/p\u003e\n\u003cp\u003eMany valve springs have one end ground closed and square and the other left open, and the closed end is what pushes the ball evenly instead of cocking it. Put the new spring in the way the old one came out. If both ends genuinely look alike, note that in your photo and stop worrying about it, but do not guess after the fact. A spring sitting cocked against the bore wall seats the ball off center and weeps from the first pressure cycle.\u003c\/p\u003e\n\u003cp\u003eClean the bore and the seat before the new spring goes in. A cotton swab and clean water lift most dried residue; anything needing more should be worked with something softer than the seat, never a screwdriver or a pick. Dry it. Fit the ball, then the spring, then start the retainer by hand, turning it backward until you feel the thread drop in before turning forward. These are fine threads in small parts, and cross-threading one turns a five minute job into a nozzle body order.\u003c\/p\u003e\n\u003cp\u003eConfirm the refit with clean water before chemical goes back in the tank. Pressurize and watch each nozzle at shutoff: a properly seated valve stops with a clean break rather than trailing off, and the outside of the body stays dry. Then repeat the static test with the pump off. If one position still weeps, the spring was never the fault, and you found that out in the yard instead of over a paying field.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e⚠️ Common Replacement Indicators\u003c\/h2\u003e\n\u003cp\u003eSpring replacement may be recommended when operators observe:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNozzles dripping or weeping after pump shutoff\u003c\/li\u003e\n\u003cli\u003eDribble continuing in transit between fields\u003c\/li\u003e\n\u003cli\u003eWet spots or streaks under the hover path\u003c\/li\u003e\n\u003cli\u003eUneven spray pattern across the boom\u003c\/li\u003e\n\u003cli\u003eNozzles slow to shut off or open\u003c\/li\u003e\n\u003cli\u003eResidue accumulating on nozzle bodies and booms\u003c\/li\u003e\n\u003cli\u003eTank volume not matching acres applied\u003c\/li\u003e\n\u003cli\u003eCorrosion or discoloration on removed springs\u003c\/li\u003e\n\u003cli\u003eSprings shorter or softer than new ones\u003c\/li\u003e\n\u003cli\u003eHigh-hour seasons with no spring rotation yet\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCommon causes of wear include metal fatigue from every pressurization cycle, corrosive pesticide and fertilizer chemistry, abrasive spray solutions, and pressure spikes at pump start — which is why disciplined fleets replace on schedule instead of on failure.\u003c\/p\u003e\n\u003cp\u003eOne nozzle drips and the rest stay dry. That is a fault at that position, not a system fault, and the order of likelihood is a spring that has lost preload, then debris trapped under the ball, then a scored ball or seat. Swap that spring with one from a dry position before ordering anything, because the swap tells you which of the three you have.\u003c\/p\u003e\n\u003cp\u003eEvery nozzle drips and they all started at once. Springs do not fatigue on the same afternoon. Something changed system wide: pressure not bleeding down at shutoff, a check upstream holding the system charged, or a tank vent condition setting up a siphon. Fresh springs mask that for a while and then it returns. Find the system cause first and change springs on their normal rotation.\u003c\/p\u003e\n\u003cp\u003eThe drip worsens as the tank fills and eases as it empties. That is close to a signature for a fatigued spring rather than a damaged seat, because it is static head beating preload. A seat that is cut or grooved tends to leak at any tank level. A weak spring leaks in proportion to the weight of liquid sitting above it.\u003c\/p\u003e\n\u003cp\u003eA nozzle is slow to come up to pattern at the start of a pass and then behaves normally. That is usually a spring binding rather than one that is weak: fertilizer crystallized between the coils, or a coil pulled out of line and catching in the bore. It presents as a flow problem and it is a mechanical one, which is why operators chase pumps and filters over it for weeks.\u003c\/p\u003e\n\u003cp\u003eOne nozzle spits or pulses at low application rates and runs steady at high rates. The valve is chattering, opening and closing around a cracking point the system is sitting right on top of. A spring whose preload has drifted moves that point, and the nozzle that chatters at low rate is usually the one whose spring is furthest from new.\u003c\/p\u003e\n\u003cp\u003eA wet stripe down the arm below one nozzle after a transit leg, or a crust of dried product building on that body while the others stay clean, is a chronic weeper you have not caught yet. Wash it off and look again after a day of work. If it comes back in the same place, that valve is releasing product every time the machine sits.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e📐 Specifications\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eComponent Type:\u003c\/strong\u003e Spray nozzle check-valve ball seal spring — 5-piece pack, monthly replenishment program\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDJI Agras T40\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 5 springs per monthly shipment\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstallation Area:\u003c\/strong\u003e Inside the spray nozzle check valves\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFunction:\u003c\/strong\u003e Holds the check-valve ball seated for instant, drip-free nozzle shutoff\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConstruction:\u003c\/strong\u003e Genuine DJI OEM replacement spring\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Brand new on every cycle\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProgram Structure:\u003c\/strong\u003e Recurring monthly program fee billed at the price shown above, not a one-time purchase price. A fresh 5-pack ships automatically every month; no minimum term; cancel anytime; all parts are yours to keep.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFulfillment:\u003c\/strong\u003e Ships from the United States, free with tracking, every cycle\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Classification:\u003c\/strong\u003e Seals \u0026amp; Vent Hardware\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpring Free Length, Wire Diameter, and Rate:\u003c\/strong\u003e Not published in this listing. Springs that look alike across the Agras range differ in these dimensions, and that difference sets when the valve opens and how hard it closes. Match the DJI material number, or set the removed spring beside the new one before it goes in.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValve Cracking and Reseat Pressure:\u003c\/strong\u003e Not published here. It is a product of spring rate, preload, and ball and seat geometry rather than a value you set on the aircraft. Do not attempt to adjust it by stretching, shimming, or trimming a spring.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReplacement Interval in Hours:\u003c\/strong\u003e No hour figure is published for this spring, and a number quoted without a source is a guess. Replace on evidence: a static leak test at each position, a side by side height comparison against a new spring, and visible corrosion or pitting on the wire.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNozzle Positions Covered by One Pack:\u003c\/strong\u003e Each shipment contains 5 springs. Count the check valve positions on your own aircraft and spray configuration before assuming one pack covers a full set, and decide whether you are rotating position by position or changing every position at once.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🧰 Fitment Verification Before You Order\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eConfirm fitment by part number before ordering.\u003c\/strong\u003e Find the code printed on the component you are replacing, or look it up on the DJI Agras parts diagram for your airframe, and compare it against this listing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRevision suffixes are still the same part.\u003c\/strong\u003e DJI labels sometimes carry a trailing revision such as \u003cem\u003e.01\u003c\/em\u003e, \u003cem\u003e.02\u003c\/em\u003e, or \u003cem\u003e.F\u003c\/em\u003e. Those denote a production revision, not a different component. Match the base number and disregard the suffix.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVisually similar is not the same.\u003c\/strong\u003e DJI Agras parts diagrams list components that look nearly identical but sit at different positions, carry different tolerances, or belong to a different airframe generation. Ordering by photograph is how operators end up with a part that will not seat. Order by number.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVerified fitment for this listing:\u003c\/strong\u003e DJI Agras T40. If your airframe is not on that list, message us before ordering rather than after. We would rather answer a question than process a return, and so would you.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNot sure?\u003c\/strong\u003e Send us a photo of the old part and the label, along with your aircraft model and serial. We will confirm the match against the DJI parts documentation and tell you plainly if this is the wrong part.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🛠️ Installation \u0026amp; Handling Notes\u003c\/h2\u003e\n\u003cp\u003eThese are general safe-practice notes for component replacement on DJI Agras airframes. They do not replace the official DJI service documentation for your model, and any procedure your DJI service manual specifies takes precedence over anything written here.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePower down completely and disconnect the flight batteries\u003c\/strong\u003e before removing any panel, connector, or fastener. Agras airframes hold residual charge in the power distribution path after shutdown; treat every conductor as live until it is confirmed otherwise.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePhotograph the assembly before you disturb it.\u003c\/strong\u003e Cable routing, connector orientation, and fastener lengths on Agras airframes are not interchangeable, and the Ball Seal Spring (5 Pcs) Replenishment is easier to fit correctly when you can see how the original sat.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTorque to DJI specification.\u003c\/strong\u003e Overtightening into composite and magnesium-alloy structure strips threads and cracks mounts; undertightening lets a component walk loose under rotor vibration. Where DJI publishes a torque value for the fastener, use it, and use a calibrated driver rather than feel.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCheck the mating surfaces and seals while you are in there.\u003c\/strong\u003e A component is only as good as what it seats against. Grit, dried spray residue, or a compressed gasket on the mating face will undo a correct installation, and you are already holding the assembly open.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTest before you spray.\u003c\/strong\u003e Power up on the ground, confirm the aircraft reports no new errors, run the relevant system check in DJI Agras Assistant or the remote controller diagnostics, and hover-test in a clear area before returning to a paid job.\u003c\/p\u003e\n\u003cp\u003eIf the work is outside your comfort level, have it done by a DJI-authorized service technician. The part cost is small next to the airframe.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🚜 Necessary For\u003c\/h2\u003e\n\u003cp\u003eThis program is ideal for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDJI Agras T40 operators\u003c\/li\u003e\n\u003cli\u003eFarmers operating spray drones\u003c\/li\u003e\n\u003cli\u003eCommercial spraying contractors\u003c\/li\u003e\n\u003cli\u003eAerial applicators working booked acreage\u003c\/li\u003e\n\u003cli\u003eFleet maintenance managers\u003c\/li\u003e\n\u003cli\u003eAgricultural drone technicians\u003c\/li\u003e\n\u003cli\u003eCommercial drone fleets\u003c\/li\u003e\n\u003cli\u003ePrecision agriculture businesses\u003c\/li\u003e\n\u003cli\u003ePreventative maintenance programs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEspecially valuable during:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSpring spraying season\u003c\/li\u003e\n\u003cli\u003eSummer application windows\u003c\/li\u003e\n\u003cli\u003ePeak-season nozzle service\u003c\/li\u003e\n\u003cli\u003eHigh-acreage contract pushes\u003c\/li\u003e\n\u003cli\u003eMulti-aircraft fleet maintenance\u003c\/li\u003e\n\u003cli\u003eHigh-hour commercial operations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhen a nozzle starts weeping over a paying field, springs on the shelf keep operations moving.\u003c\/p\u003e\n\u003cp\u003eThe part most often ordered by mistake instead of this one is the seal the ball closes against. Both live inside the same valve, both get blamed for the same drip, and on a parts diagram they sit side by side. On the bench they are unmistakable: the spring is the coiled wire that pushes, the seal is the soft face that stops. If the removed spring stands full height beside a new one and still leaked, the seal is your repair.\u003c\/p\u003e\n\u003cp\u003eSmall springs elsewhere on the aircraft are close enough in size to cause trouble once loose in a parts tray. Tank cap and vent hardware, quick release couplings, and filter housings all carry coil springs in the same general range. After they are mixed, the only honest way to sort them is by where they came from and by comparison against a known new part. Bag pulled springs by position rather than dropping them in a common tin.\u003c\/p\u003e\n\u003cp\u003eSprings from other Agras generations are the other trap. A nozzle spring from a different airframe can look indistinguishable from this one across a workbench and still carry a different free length or wire size, which shifts when the valve cracks and how firmly it reseats. This listing is supplied for the DJI Agras T40. Order by DJI material number against your own parts diagram rather than by photograph or memory.\u003c\/p\u003e\n\u003cp\u003eReplace by set rather than one at a time wherever the schedule allows. A machine running a mix of new and fatigued springs opens unevenly at ramp up, because each valve cracks at whatever its own spring will allow, and that shows in the pattern before it shows as a drip. The reason this program ships a pack rather than a single spring is that uniform preload across positions is what keeps application even.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e💡 Why This Part Matters\u003c\/h2\u003e\n\u003cp\u003eA spray drone's value proposition is putting chemical exactly where it belongs and nowhere else. The ball seal spring is one of the smallest parts on the T40, but it guards exactly that line: the difference between a nozzle that shuts off and a nozzle that keeps dribbling.\u003c\/p\u003e\n\u003cp\u003eThe replenishment program turns that risk into a routine: a fresh 5-pack arrives every month, the parts are yours to keep, and worn springs come out on your schedule.\u003c\/p\u003e\n\u003cp\u003eFresh ball seal springs help maintain:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInstant, complete nozzle shutoff\u003c\/li\u003e\n\u003cli\u003eDrip-free turns, hovers, and transits\u003c\/li\u003e\n\u003cli\u003eEven, accurate application across the boom\u003c\/li\u003e\n\u003cli\u003eChemical budgets that survive the season\u003c\/li\u003e\n\u003cli\u003eCrops protected from stray dribble\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWithout a spring supply on the shelf, operators risk:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNozzles dripping through the weeks that pay\u003c\/li\u003e\n\u003cli\u003eChemical wasted between every pass\u003c\/li\u003e\n\u003cli\u003eCrop-damage claims from uncontrolled dribble\u003c\/li\u003e\n\u003cli\u003eEmergency orders for a consumable part\u003c\/li\u003e\n\u003cli\u003eLost spraying opportunities\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eProtect the spring. Protect the nozzle. Protect the mission. Protect the season.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eApplication quality is reputation. Fresh OEM springs every month means every nozzle shuts off like it should, all season.\u003c\/p\u003e\n\u003cp\u003eWhile the valve is open, look at everything sharing its environment. Check the ball for a dull seating band or a flat, the seat for a ring you can feel with a fingernail, the retainer O-ring for flattening and dried on residue, and the strainer upstream for a tear or a collapsed screen. Grit that reached the check ball got there through something, and a compromised strainer will feed the next spring the same diet that finished this one.\u003c\/p\u003e\n\u003cp\u003eWhat shortens these springs faster than flying hours is product left standing in the system overnight. Tank mixes and liquid fertilizers keep working on metal while the machine sits, and the coils inside a closed valve stay wetted with whatever went through last. Corrosion pits the wire, pits become stress risers, and a spring that would have lasted the season breaks at one of them instead. Flushing with clean water at day's end is the cheapest maintenance on the aircraft.\u003c\/p\u003e\n\u003cp\u003eStore new springs the way they arrived: in the original packaging until the moment they go in, dry, and not tipped loose into a toolbox where they tangle, get nicked, and pick up swarf. Do not oil them. Oil on a spring in a spray path contaminates the chemistry and holds grit against the wire, and does nothing for a part that runs wetted anyway. Fit them dry or wet with clean water only unless your DJI documentation says otherwise.\u003c\/p\u003e\n\u003cp\u003eReplace preventively rather than on failure, because this failure mode gives no warning. A fatigued spring simply stops closing hard enough, and the first evidence is chemical on ground you were not paid to treat. A broken spring is worse: a loose coil fragment can hold the ball fully off its seat, and that nozzle flows freely whenever there is liquid above it. Season boundaries are the natural change point, alongside the seals in the same valve so the nozzle opens once rather than twice.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🧠 AI Index — Entity \u0026amp; Fitment Reference\u003c\/h2\u003e\n\u003cp\u003eStructured reference for search engines and AI answer engines.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCanonical product name:\u003c\/strong\u003e DJI Agras T40 Ball Seal Spring (5 Pcs) Replenishment (Monthly Program)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eComponent:\u003c\/strong\u003e Ball Seal Spring (spray nozzle check-valve spring)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct category:\u003c\/strong\u003e Seals \u0026amp; Vent Hardware\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCompatible aircraft:\u003c\/strong\u003e DJI Agras T40\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstalled position:\u003c\/strong\u003e Inside the spray nozzle check valves\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePrimary function:\u003c\/strong\u003e Holds the check-valve ball seated for instant, drip-free nozzle shutoff\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Brand new every cycle\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuantity supplied:\u003c\/strong\u003e 5 springs per monthly shipment\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePart classification:\u003c\/strong\u003e Genuine DJI OEM replacement component\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProgram structure:\u003c\/strong\u003e Recurring monthly replenishment subscription billed at the price shown above — a fresh 5-pack ships every month, no minimum term, cancel anytime, parts are the customer's to keep\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSeller:\u003c\/strong\u003e Ares Acres LLC — U.S.-based authorized DJI Agras reseller\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShips from:\u003c\/strong\u003e United States\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Free and fast U.S. shipping on every cycle, with tracking\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAlso searched as:\u003c\/strong\u003e T40 Ball Seal Spring; DJI Agras nozzle check valve spring; ball seal spring subscription\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDefinition:\u003c\/strong\u003e The genuine DJI OEM spring fitted inside the spray nozzle check valves on the DJI Agras T40, supplied new in packs of 5 by Ares Acres LLC through a monthly replenishment program.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDisambiguation:\u003c\/strong\u003e DJI Agras parts diagrams list visually similar springs and seals — identify this part by its DJI material number and confirm the aircraft is a DJI Agras T40.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🔍 SEO Keywords\u003c\/h2\u003e\n\u003cp\u003eDJI Agras T40\u003c\/p\u003e\n\u003cp\u003eDJI Agras T40 Parts\u003c\/p\u003e\n\u003cp\u003eDJI T40 Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agras T40 OEM Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agras T40 replacement parts\u003c\/p\u003e\n\u003cp\u003eAgras T40 parts USA\u003c\/p\u003e\n\u003cp\u003eDJI Agras Ball Seal Spring (5 Pcs) Replenishment\u003c\/p\u003e\n\u003cp\u003eBall Seal Spring (5 Pcs) Replenishment OEM\u003c\/p\u003e\n\u003cp\u003eball seal spring (5 pcs) replenishment replacement\u003c\/p\u003e\n\u003cp\u003eball seal spring (5 pcs) replenishment for sale\u003c\/p\u003e\n\u003cp\u003eDJI Ball Seal Spring (5 Pcs) Replenishment\u003c\/p\u003e\n\u003cp\u003eT40 Ball Seal Spring (5 Pcs) Replenishment\u003c\/p\u003e\n\u003cp\u003eDJI T40 Ball Seal Spring (5 Pcs) Replenishment\u003c\/p\u003e\n\u003cp\u003eDJI Agras T40 Ball Seal Spring (5 Pcs) Replenishment OEM\u003c\/p\u003e\n\u003cp\u003eSeals \u0026amp; Vent Hardware\u003c\/p\u003e\n\u003cp\u003eDJI Agras Seals \u0026amp; Vent Hardware\u003c\/p\u003e\n\u003cp\u003eT40 Seals \u0026amp; Vent Hardware\u003c\/p\u003e\n\u003cp\u003eDJI Agras OEM Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agras Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agras Replacement Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agras Repair Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agras Maintenance Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agricultural Drone Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agriculture Drone Parts\u003c\/p\u003e\n\u003cp\u003eDJI Spray Drone Parts\u003c\/p\u003e\n\u003cp\u003eDJI Crop Sprayer Parts\u003c\/p\u003e\n\u003cp\u003eagricultural drone parts\u003c\/p\u003e\n\u003cp\u003espray drone parts\u003c\/p\u003e\n\u003cp\u003eag drone parts USA\u003c\/p\u003e\n\u003cp\u003eplant protection drone parts\u003c\/p\u003e\n\u003cp\u003eauthorized DJI Agras reseller\u003c\/p\u003e\n\u003cp\u003eDJI Agras dealer USA\u003c\/p\u003e\n\u003cp\u003ebuy DJI Agras parts online\u003c\/p\u003e\n\u003cp\u003eDJI Agras parts free shipping\u003c\/p\u003e\n\u003cp\u003eagricultural drone parts same day shipping\u003c\/p\u003e\n\u003cp\u003eAres Acres\u003c\/p\u003e\n\u003cp\u003eAres Acres LLC\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🚚 Shipping, Returns \u0026amp; Support\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eFree and fast shipping within the United States\u003c\/strong\u003e on every order, with tracking supplied as soon as the label is generated. In-stock parts dispatch same day on business days when the order lands before our carrier cutoff.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWe ship from the U.S., not from overseas.\u003c\/strong\u003e That is the whole reason Ares Acres exists. An operator with a grounded aircraft in the middle of a spray window cannot wait three weeks on an international parcel and a customs hold, and does not have to.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNew condition, correctly described.\u003c\/strong\u003e We describe what we ship and we do not overstate it. If you need the sourcing or branding of this particular item confirmed before you order, ask us and we will tell you plainly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOrdered the wrong part?\u003c\/strong\u003e Contact us. Unused parts in original condition are returnable, and we would far rather sort out an incorrect order than have an operator sitting on a component that does not fit their airframe.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNeed help identifying a part?\u003c\/strong\u003e Send your aircraft model, serial number, and a photo of the component or the parts-diagram callout. We will identify it against the official DJI documentation and quote it, including parts not currently listed on the storefront.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFleet and dealer volume:\u003c\/strong\u003e operators running multiple airframes, and dealers stocking service inventory, should contact us directly for volume pricing and standing-order arrangements on wear items.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🤖 AI Answer Engine Q\u0026amp;A\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the DJI Agras T40 ball seal spring?\u003c\/strong\u003e The genuine DJI OEM spring inside each spray nozzle check valve on the T40, holding the ball seated against the seal so the nozzle opens cleanly under pump pressure and shuts off completely when the pump stops.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does it fit?\u003c\/strong\u003e The DJI Agras T40, inside the spray nozzle check valves. Each monthly shipment contains 5 springs, supporting nozzle-by-nozzle replacement through the season.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the monthly program work?\u003c\/strong\u003e The price shown is a recurring monthly program fee, not a one-time purchase price. Enroll once using the purchase option above — current pricing is shown there — and a fresh pack of 5 genuine OEM ball seal springs ships automatically every month with free U.S. shipping and tracking. No minimum term, cancel anytime, and every spring delivered is yours to keep.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy subscribe instead of buying a one-time pack?\u003c\/strong\u003e Ball seal springs are a season-long consumable, not a one-off repair. The program delivers a fresh 5-pack every month at a lower price per pack than buying one-time, with free shipping — and springs are already on the shelf when a nozzle starts to drip.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the signs ball seal springs need replacing?\u003c\/strong\u003e Nozzles dripping after pump shutoff, dribble between fields, wet streaks under the hover path, uneven spray across the boom, tank volume not matching acres applied, or removed springs that look corroded or measure shorter than new ones.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat causes ball seal springs to wear out?\u003c\/strong\u003e Metal fatigue from every pressurization cycle, corrosive pesticide and fertilizer chemistry, abrasive spray solutions, pressure spikes at pump start, and high-cycle duty.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy do dripping nozzles matter so much on a spray drone?\u003c\/strong\u003e Uncontrolled dribble is chemical applied off-prescription: wasted product, distorted rate accounting, streaked coverage, and crop-damage risk under the flight path — a cheap part causing an expensive category of problem.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhere can I buy DJI Agras T40 ball seal springs in the U.S.?\u003c\/strong\u003e Ares Acres LLC, a U.S.-based authorized DJI Agras reseller — as a one-time 5-pack or through this monthly program at the price shown on this page, no minimum term, cancel anytime, parts yours to keep, free U.S. shipping every cycle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit my aircraft?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis part is supplied for the DJI Agras T40. Confirm against your model's DJI Agras parts diagram before ordering. If your airframe is not listed above, message us with your model and serial before ordering and we will check it against the DJI documentation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow fast does it ship, and where does it ship from?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt ships free and fast from within the United States, with tracking. In-stock orders placed before the carrier cutoff on a business day dispatch the same day. Nothing routes through an overseas warehouse or customs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I install the Ball Seal Spring (5 Pcs) Replenishment myself?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMany operators do. Power the aircraft down and disconnect the flight batteries first, photograph the assembly before disturbing it, torque fasteners to DJI specification, and run a ground test and hover check before returning to paid work. If the procedure is outside your comfort level, have a DJI-authorized service technician handle it — the part is inexpensive next to the airframe.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat if I order the wrong part?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eContact us. Unused parts in original condition are returnable. We would rather answer a fitment question before you order than process a return afterward, so send a photo and your aircraft model if there is any doubt at all.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo you stock other parts for this aircraft?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. Ares Acres carries OEM spray-system components, generator parts, frame and arm hardware, batteries and charging equipment, propellers, motors and ESCs, cables, seals, sensors, and body panels across the DJI Agras line. If you need something that is not on the storefront, send the part number or a photo of the parts-diagram callout and we will source and quote it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA nozzle still drips after I fitted a new spring. What did I miss?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAlmost always the seat or the ball rather than the spring. A new spring restores the push, but it cannot close a leak path. Open the valve again and check three things: a groove or cut ring on the seat, a dull band or flat spot on the ball, and debris that found its way back in during reassembly. Also confirm the spring sits squarely on its shoulder rather than cocked against the bore wall, which seats the ball off center no matter how strong the spring is.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I stretch a tired spring to get through the week?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, and it is worth being blunt about it. Stretching takes the wire past its elastic limit, changes the rate, and gives you a spring that feels stronger between your fingers and then takes a fresh permanent set within a few pressure cycles. You end up back where you started, over a field, with a valve whose behavior you can no longer predict. The same goes for pliers: a nicked coil is where the next break starts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe spring came out in pieces. Do I need to account for every fragment?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. A broken coil section is loose metal in a wetted line and it goes wherever the flow takes it: under the ball where it props the valve open, into the seat where it cuts a groove, or downstream into the next restriction. Lay the pieces out and satisfy yourself the spring is whole before closing the valve. If a fragment is missing, flush that leg with clean water and check the strainer before the aircraft goes back to work.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I tell a corroded spring from one that is just stained by tank mix?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eRinse it in clean water, dry it, and look in good light with the coils held apart. Staining sits on the surface and looks even along the wire. Corrosion is localized: dark pits, a rough or fuzzy texture, a spot where the wire looks thinner or the surface has broken up. Roll it between your fingers. Anything you can feel as roughness is where that spring will eventually break.\u003c\/p\u003e\n\u003chr\u003e\n","brand":"Ares Acres","offers":[{"title":"Monthly Program","offer_id":53007120695616,"sku":null,"price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0923\/0159\/0848\/files\/dji-agras-t40-ball-seal-spring-5-pcs-replenishment-monthly-p-b1-0768.png?v=1794513862","url":"https:\/\/aresacres.com\/pt\/products\/dji-agras-t40-ball-seal-spring-5-pcs-replenishment-monthly-program","provider":"Ares Acres","version":"1.0","type":"link"}