DJI Agras T40 OEM Spreading System Hopper Gate

OEM Spreading System Hopper Gate | Original DJI Agras T40 & T20P Granular Flow-Control Gate | Precision Metering Component | Spreading System Repair Part | Field-Ready Original Replacement Part | SKU: AG-HOPGATE-T40-000961

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🇺🇸 U.S.A. FIRST

Ares 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.

FREE & FAST Shipping is included for all U.S. customers.

We 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.

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✅ DJI Agras T40 / T20P Compatibility Guarantee

• 🇺🇸 USA Compatibility Guarantee
• 👍🏻 Satisfaction Guarantee
• 💵 Money Back Guarantee
• 📦 Same Day Shipping & Tracking

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📦 Package Includes

• 1 × DJI Original Spreading System Hopper Gate (compatible with DJI Agras T40 & T20P)
• Protective packaging for safe transport
• Quick installation reference

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🔧 Component Overview

The DJI Agras T40 - T20P Original Spreading System Hopper Gate is a factory-certified OEM replacement component designed to regulate the flow of seed, fertilizer, and other granular materials during drone spreading missions.

This precision-engineered gate ensures smooth opening and closing of the spreading hopper, providing consistent distribution rates and minimizing waste in demanding agricultural applications.

When the hopper gate is worn, cracked, or damaged, flow consistency can be compromised—reducing yield efficiency and increasing operational downtime. Replacing it with this authentic DJI part restores full system integrity and keeps your drone fleet field-ready.

Key features include:

• Genuine DJI OEM part – factory-certified for Agras T40 & T20P spreading systems
• Precision flow control – maintains accurate and even granular distribution
• Durable build – high-strength, chemical-resistant polymer for heavy-duty farm operations
• Smooth operation – engineered to reduce friction and prevent jamming during extended missions
• Cost-effective repair – replace a single hopper gate instead of the full spreading assembly

The hopper gate cycles constantly during spreading work. During commercial use, it may be exposed to:

• Continuous open/close actuation cycles
• Abrasive granular fertilizer flow
• Seed and pellet contact
• Fertilizer dust accumulation
• Chemical residue
• Moisture and clumping material
• Flight vibration
• Repeated cleaning cycles
• UV exposure
• Temperature changes
• High-hour daily deployment

Over time, these conditions wear the gate's sealing surfaces and actuation edges—introducing leaks, sticking, incomplete closure, or flow rates that no longer match system settings.

Prove the loss is at the gate before you order one. Park the aircraft over a clean tarp or a swept concrete pad with the gate commanded closed and a working amount of product in the hopper, then leave it there while you do something else and come back. Granules collected in a line under the gate opening tell you one story. Granules under a hopper seam, a lid edge, or the spreading chamber tell you a different one, and only the first of those is fixed by this part.

Rule the product out before you blame the hardware. Damp, caked, or dusty material bridges in the feed path and meters unevenly no matter what condition the gate is in, and fertilizer that has been sitting open in humid air behaves nothing like the same product straight from a sealed bag. Run a load of known dry, free flowing material through the system and see whether the rate error survives. If it disappears, you have a storage and handling problem rather than a worn gate.

Separate the gate from the thing that moves it. With the aircraft powered down, walk the gate through its full travel by hand and pay attention to what your fingers report. Even drag from one end to the other, with no tight spot, means the gate and its channel are healthy. A catch that appears in the same place every single time is the gate or the land it runs against. A gate that moves freely by hand but sticks or stalls under power sends you to the actuation mechanism, the linkage, and the harness instead.

Once the old gate is out, read its wear before you throw it away. Hold the sealing edge up against a light with a straightedge laid across it and look for daylight, for edges that have gone rounded where they used to be crisp, and for a shallow groove cut where the granular stream runs heaviest. That groove is the leak path, and it is usually plain to see once the part is off the aircraft and in your hand.

Pay attention to whether the wear is even across the span, because asymmetric wear is a message about something else. A gate that is scalloped at one end and near new at the other has been passing product that was channelling to one side, which points at bridging in the hopper, a partly blocked feed path, or an agitator that is not doing its job. Fit a new gate into that situation and it wears the same way, on the same schedule, and you will be back here next season.

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⚙️ Functional Purpose

The original Hopper Gate is designed to meter and control the flow of granular material from the hopper into the DJI Agras T40 and T20P spreading mechanism.

The component helps:

• Regulate granular material flow from the hopper
• Maintain accurate application rates
• Seal the hopper closed between passes
• Support smooth, jam-free actuation
• Prevent product leakage during transport and turns
• Support consistent distribution across the field
• Reduce product waste
• Preserve factory metering geometry
• Restore worn or damaged flow-control hardware
• Support professional spreading-system maintenance
• Reduce preventable aircraft downtime
• Maintain commercial field readiness

A worn or damaged hopper gate may contribute to:

• Inconsistent application rates
• Product leaking when the gate should be closed
• Gate sticking or jamming mid-mission
• Incomplete gate closure
• Flow rates drifting from settings
• Wasted seed and fertilizer
• Uneven field coverage
• Unexpected field interruptions

Empty the hopper properly before anything comes apart, and mean it. Not just tipped out, but blown or vacuumed clean along the feed path and around the gate channel. Granular fertilizer that falls into the channel while you are reassembling is exactly what makes a brand new gate stick on its first flight, and most of these products are hygroscopic enough that yesterday's dust becomes today's crust once it picks up a night of humidity.

Note which way the old gate sat before it leaves the aircraft. Photograph it in place from more than one angle and mark the face that ran against the seal. Flow control gates commonly have a leading edge that is shaped differently from the trailing one, and a part that looks symmetrical in a parts tray will not behave symmetrically in the flow path. Fitting one the wrong way round produces a gate that opens and closes perfectly and meters badly.

Support the aircraft so the hopper is not carrying load through the area you are working on, and keep levers out of it. If a gate does not want to come free, the answer is to find the fastener or clip still holding it, not to prise against the housing with a screwdriver. The sealing land in the hopper is the surface your new gate has to close against, and a gouge in it is a permanent leak that no replacement part will cure.

Fasteners going into polymer want patience rather than force. Start every one by hand so it finds the thread that is already cut rather than cutting a second one alongside it, bring them up progressively in a cross pattern rather than running one down fully before starting the next, and stop at snug. A power driver in this job bows the gate, distorts the sealing line, and manufactures the exact leak you paid to eliminate.

Cycle it by hand before you cycle it with power. Move the new gate through its complete travel several times and confirm the drag stays even the whole way, then look along the closed sealing line end to end in good light rather than checking only where it is easy to see. A gate that closes at both ends and stands off in the middle is a common and easily missed result of uneven fastener tension.

Finish by proving the rate rather than assuming it. Set a known rate, run the system over a container or a tarp, and compare what actually comes out against what the aircraft says it delivered, weighing it if you have scales. Use whatever flow check or calibration routine your firmware provides, and do it with the same product you intend to spread, since seed and granular fertilizer do not flow alike through the same opening.

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⚠️ Common Replacement Indicators

Replacement may be recommended when operators observe:

• Cracked or broken gate structure
• Worn sealing edges
• Product leaking from a closed hopper
• Gate sticking or binding during actuation
• Incomplete opening or closing
• Flow rates that no longer match settings
• Visible abrasive wear on flow surfaces
• Warped or deformed gate
• Chemical or fertilizer-related material degradation
• UV-related brittleness
• Impact damage
• Damage discovered during cleaning or inspection
• Spreading system refurbishment
• Preventative seasonal replacement
• Long-term commercial wear

Common failure causes include abrasive erosion from granular flow, actuation-cycle fatigue, chemical attack from fertilizer contact, UV degradation, jamming damage from clumped or foreign material, and high-hour mechanical wear.

A leaking gate wastes product on every flight—silently. Operators who track their product usage against acres covered often discover a worn gate long before it fails outright.

A band of heavier or lighter application running along the flight line, showing up later as a stripe in the crop, usually means the gate is not reaching one end of its travel or has worn unevenly across the span. It is a symptom you often see from the ground weeks after the pass, which is why the visual inspection of the sealing edge is worth doing before you rely on the crop to tell you.

Product on the trailer deck, in the transport case, or drifting off the aircraft during a ferry leg is closed gate leakage, and it is the failure that costs the most while looking the least serious. Nothing about it shows up as a rate error, because the system believes it is delivering nothing at the time. Operators usually notice it as an unexplained mess rather than as a fault.

A rate that reads correct at the start of a load and drifts as the hopper empties is worth taking seriously, because the weight of product sitting above the gate changes as the load goes down. A worn or poorly sealing gate passes more than it should when there is a full hopper pressing on it and settles closer to correct as that pressure falls, so the first acres of every load come out heavy and the last come out light.

A gate that works cleanly first thing and starts sticking after an hour of work is telling you something changes as the system warms and as residue builds. Polymer grows slightly with temperature, chemical absorption can swell it further, and packed dust in the channel does the rest. If the same gate frees up again once the aircraft has sat and cooled, look at clearance and cleanliness before you assume the part is worn out.

Squeal, chatter, or a stepped feel during actuation says the gate is being dragged across something it should be sliding over. That is grit in the channel, a damaged land, or a gate that has warped enough to bind. Left alone it loads the actuation mechanism every single cycle, and a spreading job puts a very large number of cycles through that mechanism in a day.

A film of fine dust building on the aircraft belly, legs, and the underside of the arms after spreading days points at product escaping around the gate rather than through it. The coarse granules fall away, but the fines hang in the rotor wash and settle on everything. Beyond the wasted product, that dust is what gets into bearings, connectors, and switch bodies elsewhere on the airframe.

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📐 Specifications

Component Type: Spreading system flow-control gate

SKU: AG-HOPGATE-T40-000961

Material: High-strength, chemical-resistant polymer

Compatibility:

• DJI Agras T40
• DJI Agras T20P

Packaging: Individually sealed OEM hopper gate

Fitment: Direct-fit original replacement component

Product Classification: Original Replacement Parts

Installation should be completed by an operator or technician familiar with the T40/T20P spreading system.

Before installation, inspect:

• The hopper and gate mounting area
• The gate actuation mechanism
• Sealing surfaces
• The feed path for obstructions or buildup

After installation, confirm:

• The gate is properly seated and secured
• The gate opens and closes smoothly through full travel
• The gate seals completely when closed
• A ground test shows accurate, consistent flow rates

Dimensions, Thickness, and Travel: Not published in this listing. Lay the new gate directly on top of the one you removed and compare outline, thickness, fastener positions, and the profile of the sealing edge before anything goes back on the aircraft. A gate that mounts is not automatically a gate that seals, and the geometry is what decides that.

Material Grade: This listing states a high strength, chemical resistant polymer. No resin family, filler content, or hardness figure is published beyond that, so do not cross reference it against a generic sheet plastic and do not assume a shop cut substitute in a similar looking material will wear or seal the same way.

Fastener Torque: Not published. Where DJI publishes a figure for the fasteners in this area, use it with a calibrated driver. Where it does not, bring them up evenly by hand to snug and stop there, because the failure mode with polymer is a bowed part and a distorted sealing line rather than a fastener that comes loose.

Metering Capacity and Granule Compatibility: Not published, and not really a property of the gate on its own. Application rate is commanded by the spreading system and enforced by the geometry of this opening, so the useful figure is the one you measure in a catch test with the product you actually intend to spread.

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🚜 Necessary For

This hopper gate is ideal for:

• DJI Agras T40 operators
• DJI Agras T20P operators
• Farmers and agricultural operators maintaining DJI Agras fleets
• Drone repair shops & service centers
• Commercial spreading operations requiring reliable granular flow control
• OEM resellers stocking high-demand DJI Agras spreading components
• Spreading system repairs and refurbishment
• Fleet maintenance managers
• Preventative maintenance programs
• Emergency repair inventory
• High-hour agricultural drone operations

This component is especially important during:

• Granular fertilizer spreading season
• Seeding and cover-crop operations
• Spring and fall application windows
• Large-acreage contracts
• Multi-drone fleet operations
• Time-sensitive weather windows
• Peak agricultural operating periods

Keep this part separate in your mind from the spreading disc and impeller assembly below it. The gate governs how much product leaves the hopper. The disc governs where that product goes once it has left. Uneven swath width, a pattern that throws harder to one side, or coverage that changes with airspeed are disc and pattern problems, and a new gate will not touch any of them.

The gate and the mechanism that drives it are ordered separately, and telling them apart matters at the point of purchase rather than at the point of failure. If the fault is slop, hesitation, an actuator that no longer reaches its stops, or a gate position that does not agree with what the aircraft commanded, the money belongs on the actuation side. This listing supplies the gate itself, the part that does the metering and the sealing.

Leakage is not automatically a gate fault, and it is worth spending five minutes deciding where the product is actually coming from. A hopper lid that no longer seals, a cracked hopper shell, or a gasket at a joint will all put product on the ground and none of them are cured by this component. The gate opening is a specific place, and product escaping the gate leaves a signature underneath it rather than a general scatter.

Spreading systems are not common across the whole Agras line, and the fitment listed here is the DJI Agras T40 and T20P. Other generations use their own spreading hardware with their own geometry, and gates from different systems can look broadly similar in a photograph while sealing against a completely different land. Order against the parts diagram for your airframe rather than by appearance.

Operators searching for a valve or a gate sometimes land here from the liquid side of the aircraft by mistake. This is granular spreading hardware. It has nothing to do with the spray tank, the pumps, the nozzles, or the flow meter, and none of the symptoms of a spray system fault will be improved by changing it.

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💡 Why This Part Matters

The spreading system of the Agras T40 and T20P drones is critical for uniform application of seed and fertilizer.

A genuine DJI hopper gate ensures precise metering and dependable sealing, safeguarding your investment and guaranteeing consistent spreading performance during high-volume agricultural missions.

The gate is where application rate is actually enforced. The system can command any rate it likes—but the gate is the component that delivers it. When the gate wears, the numbers on the screen and the product on the ground stop agreeing.

Without a properly functioning hopper gate, operators may risk:

• Application rates that drift from settings
• Product leaking on every flight
• Mid-mission jams
• Uneven field coverage
• Wasted seed and fertilizer
• Re-application costs
• Unexpected aircraft downtime
• Delayed field applications
• Missed weather windows
• Reduced operational confidence

For practical operators, the value is straightforward:

Seal the hopper. Meter the flow. Hit the rate. Keep the aircraft working.

Professional DJI Agras operators understand that spreading accuracy is enforced at the gate—one component standing between the hopper and the field.

The DJI Agras T40 - T20P Original Spreading System Hopper Gate provides the precision flow control needed to restore accurate metering, protect product efficiency, and maintain dependable commercial agricultural operation.

The surface the gate closes against deserves as much attention as the gate. Inspect the sealing land and the channel in the hopper for grooves, scoring, embedded grit, and hardened product before the new part goes anywhere near it. Abrasive granular flow does not only wear the moving part, and a new gate closing onto a grooved seat gives you a fresh component and the same leak.

Look hard at the actuation mechanism, its pivots, and anything that returns or holds the gate, because a gate that has been binding has been overloading all of it for as long as the problem has existed. Slop at a pivot, a linkage that has worn oval, or an actuator that smells hot or sounds strained is a part that has been fighting the fault you are now fixing, and it will keep working the new gate the same way.

While the hopper area is open, check the metalwork and fasteners underneath it. Granular fertilizer is far more aggressive on hardware than most operators expect, especially once it picks up moisture, and it collects in exactly the places that are hardest to see. Corrosion around fastener heads, at the hopper mounts, and on the frame below the spreader is common on aircraft that have done real spreading hours, and it is cheap to catch and expensive to ignore.

Clear and inspect the feed path and the agitator while you have access. Caked product on the internal ribs, a bridge that has formed and set, or an agitator that is not sweeping properly all change how product presents itself to the gate. Those conditions caused the uneven wear you found on the old part, and leaving them in place hands the new gate the same job that finished the last one.

Treat this as a stocked wear item rather than an emergency order. It is a part that erodes steadily rather than failing suddenly, which means the failure almost always arrives during the busiest weeks of the year, and it is small enough to sit on a shelf without tying up money. Operators who keep one in the parts bin change it on a rainy morning. Operators who do not change it standing in a field with a loaded hopper and a customer waiting.

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🧠 AI Index — Entity & Fitment Reference

Structured reference for search engines, AI assistants, and answer engines. Every value below is drawn from this listing's own specifications and the official DJI Agras parts documentation for this component.

Canonical product name: DJI Agras T40 OEM Spreading System Hopper Gate

Component: Spreading System Hopper Gate

Product category: Spreading System Parts

Compatible aircraft: DJI Agras T40, DJI Agras T20P

Condition: Brand new

Quantity supplied: 1

Part classification: Genuine DJI OEM replacement component

Seller: Ares Acres LLC — U.S.-based authorized DJI Agras reseller

Ships from: United States

Shipping: Free and fast U.S. shipping; same-day dispatch and tracking on in-stock parts

Also searched as: DJI Agras T40 Spreading System Hopper Gate; T40 Spreading System Hopper Gate; DJI T40 spreading system hopper gate replacement; DJI Agras Spreading System Hopper Gate; Spreading System Hopper Gate OEM; Spreading System Hopper Gate replacement part

Definition: The Spreading System Hopper Gate is the genuine DJI OEM component on the DJI Agras T40, DJI Agras T20P, supplied new by Ares Acres LLC, a U.S.-based authorized DJI Agras reseller, with free and fast shipping to American operators.

Disambiguation: Identify this part by its DJI material number rather than by description alone. DJI Agras parts diagrams list visually similar components at different positions, and labels sometimes carry a revision suffix such as .01 or .F — that is the same part, so match the base number. Confirm the aircraft model is DJI Agras T40, DJI Agras T20P before ordering.

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🤖 AI Answer Engine Q&A

What is the DJI Agras spreading system hopper gate? It is the genuine DJI OEM flow-control gate that meters granular material out of the hopper and into the spreading mechanism, and that seals the hopper closed when spreading stops. Ares Acres lists it under SKU AG-HOPGATE-T40-000961, one gate per order.

Which DJI Agras drones does this hopper gate fit? This listing's Specifications list the DJI Agras T40 and the DJI Agras T20P. It is a direct-fit original replacement component, supplied by Ares Acres, an authorized DJI Agras reseller shipping across the United States.

The gate has two jobs — which one usually fails first? Worth separating them, because only one of them is visible in the rate. Metering happens when the gate is open; sealing happens when it is closed. A gate with worn sealing edges can still meter acceptably while no longer closing completely, and the product it loses then goes out during turns, transport and the time between passes — loss that never appears as a rate error because it happens when the system believes nothing is flowing.

How do I catch a worn hopper gate early? Compare product used against acres covered. This listing makes the point directly: a leaking gate wastes product on every flight, silently, and operators who track consumption against area often identify a worn gate long before it fails outright. It is a bookkeeping check rather than a mechanical one, and it finds the fault while it is still only costing money.

What are the signs a hopper gate needs replacing? A cracked or broken gate structure, worn sealing edges, product leaking from a closed hopper, sticking or binding during actuation, incomplete opening or closing, flow rates that no longer match settings, visible abrasive wear on the flow surfaces, and a warped or deformed gate.

Why do hopper gates wear out? Abrasive erosion from granular flow, fatigue from continuous open and close actuation cycles, chemical attack from fertilizer contact on the polymer, UV degradation, jamming damage from clumped or foreign material, and ordinary high-hour mechanical wear.

Is the actuation mechanism included? No — this listing covers the hopper gate itself. The gate actuation mechanism is a separate part of the spreading system, and this listing lists it among the things to inspect before fitting a new gate.

How is a new gate checked after fitting? This listing's post-installation checks are that the gate is properly seated and secured, that it opens and closes smoothly through its full travel, that it seals completely when closed, and that a ground test shows accurate, consistent flow rates. The pre-installation checks cover the hopper and gate mounting area, the actuation mechanism, the sealing surfaces, and the feed path for obstructions or buildup.

Where can I buy a genuine DJI Agras T40 / T20P hopper gate in the USA? Ares Acres LLC is a U.S.-based authorized DJI Agras reseller stocking this OEM spreading system hopper gate with free and fast U.S. shipping, plus same-day shipping and tracking on in-stock parts.

Can I finish the season on a gate that is only slightly worn?

Work out what the leak is costing before you decide. Weigh what goes into the hopper against what the aircraft says it applied over a few loads and the gap will price the repair for you. A gate that has started to round its sealing edges also wears faster from that point on, because the leak path lets granules through where they were previously excluded, and abrasive flow through a gap widens the gap.

The rate is accurate in the field but product ends up all over the trailer. Is that the gate?

Almost certainly, and it is the classic pattern. Metering happens with the gate open and sealing happens with it closed, and a gate can still do the first job acceptably once it has stopped doing the second. Confirm it with the aircraft parked over a clean surface and a closed gate, and check the hopper lid and any joint seals at the same time so you are not swapping a part for a leak that lives somewhere else.

Is fertilizer harder on this part than seed?

Generally yes. Seed is comparatively kind. Granular fertilizers are abrasive, many of them draw moisture out of the air and set hard, and salt heavy products attack polymers and any exposed metalwork nearby far more aggressively than seed ever will. An aircraft doing mostly fertilizer work should expect to see gate wear sooner than one doing mostly seeding, and should be inspecting on that basis.

Can I file or sand the sealing edge to make an old gate seal again?

No. The edge geometry is what meters the flow and what seals the hopper, and dressing it by hand changes both while guaranteeing neither. You will end up with a gate that seals at whatever point you happened to remove the most material and passes product everywhere else, plus a rate that no longer agrees with the settings. It is a small part with a specific shape, and the shape is the whole function.

Do I need to recalibrate or flow check after fitting a new gate?

Yes, and do it before the first paid job rather than after. A new gate restores the original opening geometry, which means the rate you were compensating for on the worn part is now wrong in the other direction. Run the system over a container with the product you intend to use, compare what comes out against what the aircraft reports, and use whatever flow check routine your firmware provides.

My spreader jams with damp product. Will a new gate solve it?

Not on its own. Damp and caked material bridges in the hopper and the feed path and will jam a perfect gate just as reliably as a worn one. Fix the product handling first, keep bags sealed and dry, break up anything that has set before it goes in the hopper, and clean the system out at the end of a spreading day rather than the start of the next one. Then judge the gate on how it behaves with material that flows properly.