DJI Agras T40 OEM Complete Water Tank / Spray Tank System Assembly

DJI Agras T40 OEM Complete Water Tank / Spray Tank System Assembly — a complete replacement liquid payload tank assembly for DJI Agras T40 agricultural spraying operations. This is intended for operators repairing a damaged tank system, restoring an aircraft after impact or chemical exposure, or building a service-ready spare payload module rather than replacing individual tank-side components one at a time.

🇺🇸 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.

Ares Acres supplies DJI Agras parts for commercial operators who depend on their aircraft for productive acres, not recreational flight. The T40 water tank is one of the aircraft’s primary working systems. A cracked shell, damaged fitting, failed internal plumbing path, broken mounting structure, or compromised sensor interface can take an otherwise healthy aircraft out of service. A complete assembly gives repair teams a cleaner path back to operation when the failure extends beyond a single small component.

We use specialized technicians to verify and dispatch the Complete Water Tank / Spray Tank System Assembly ordered.

Parts 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.

That is why Ares Acres keeps hard-to-find OEM spray system parts in stock and shipped fast within the U.S.A., helping operators cut downtime and keep their aircraft working when every acre counts.

For 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.

Ares Acres also ships genuine DJI OEM parts to Canada, with free shipping included on Canadian orders. Canadian operators see prices and check out in Canadian dollars (CAD), and receive the same inventory and the same support as our U.S. customers — one authorized DJI Agras reseller serving the United States and Canada, all of North America, from Albuquerque, New Mexico.

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✅ Compatibility

• DJI Agras T40 agricultural spraying drone
• T40 liquid spray payload system
• Operators replacing a complete spray tank assembly or major tank-side subassembly

Important: confirm the aircraft model, tank mounting geometry, pump configuration, sensor connectors, hose routing, valve configuration, and harness interfaces against your original T40 system before ordering. DJI production revisions and regional configurations can differ.

📦 Package Scope

The supplier source represents a complete T40 water tank system with attached tank-side hardware and accessories. Exact supplied fittings, hoses, sensors, pump modules, wiring, caps, strainers, brackets, and small hardware can vary by supplier batch. Because this is a draft product built from supplier-source information, buyers should verify the exact included component list before final shipment.

🔧 What This Assembly Does

The spray tank stores and delivers the liquid payload used for agricultural application. It is not simply a container. The complete system interfaces with the aircraft’s pumping, flow-control, sensing, plumbing, and structural mounting systems. Its job is to hold chemical or water payload securely while feeding the spray system consistently throughout flight.

⚙️ System Functions

• Stores liquid spray payload during operation.
• Interfaces with pump and plumbing components.
• Supports liquid-level or payload-monitoring hardware where equipped.
• Provides mounting and structural alignment with the aircraft frame.
• Supports rapid field filling and draining.
• Maintains a sealed fluid path to reduce leaks and contamination.
• Provides the physical foundation for connected valves, filters, hoses, caps, sensors, and fittings.

⚠️ Common Reasons for Replacement

A complete tank assembly may be the correct repair path after impact damage, cracked or distorted tank walls, chemical degradation, broken mounting bosses, repeated leaks from multiple interfaces, damaged integrated harnessing, missing or damaged tank-side plumbing, severe contamination, or when rebuilding an aircraft from a partially stripped condition.

Before replacing the complete tank, inspect the tank cap, cap seal, inlet filter, pump modules, hoses, quick-connect fittings, level sensor, flow meter, valves, spray tubing, mounting hardware, and aircraft-side wiring. If the failure is isolated to one serviceable component, replacing the smaller part may be more economical.

Weeping at a mounting boss that comes back within a few loads after every reseal: this is fatigue cracking in a load path rather than a sealing problem, and no sealant applied to the outside of a crack will hold against a shell that is flexing. Once a boss has started to craze, the crack grows every time the tank is filled, and it grows fastest with a full load and a rough field edge.

Level indication that drifts, sticks at one value, or reports liquid remaining after the system has run dry: with the sensing interface itself intact this is usually residue on the sensing element or air trapped in the sensing path, both of which clean out. If it survives a thorough clean and a known good harness, the tank side of that interface is the remaining suspect and it is not a part that can be improvised.

The tank no longer sits down flat, or its mounting bosses have spread so fasteners pull it into position rather than simply holding it: the shell has taken a permanent distortion from heat, load, or both. This is worth acting on quickly, because every plumbing and electrical interface in the group is now under a standing preload that will find the weakest of them.

A shell that has gone cloudy, chalky, or slightly soft and tacky on the inside surface: the material has been chemically attacked rather than simply stained. A softened inner surface holds product instead of releasing it during a rinse, which turns a cosmetic finding into a contamination problem on the next mix.

Crop response or a spray complaint caused by a product that is not in the current tank mix: this is carryover, and it is the one failure that shows up on someone else's field rather than on the aircraft. Some herbicide chemistries bind into the wall of a tank and into hose material and release slowly afterwards. When repeated full cleanout cycles do not clear it, replacing the tank side of the system is the reliable fix rather than the expensive one.

Any tank that was left full and went through a hard freeze: expanding ice loads the shell from the inside at every closed volume, including plumbing runs and fittings, and the damage does not always appear as a split. Look for a footprint that has changed shape, a fitting that now sits at a different angle, and hairlines around bosses. A freeze damaged tank often passes a static test and fails under pump pressure.

🧪 Chemical & Field Considerations

Agricultural spray systems are exposed to water, fertilizers, herbicides, fungicides, pesticides, adjuvants, cleaning agents, dust, UV exposure, vibration, and repeated thermal cycling. Rinse the tank after chemical use according to the chemical manufacturer’s instructions and local regulations. Never allow incompatible chemical residue to remain in the tank for extended periods.

🧰 Installation Guidance

Installation should be performed by a technician familiar with DJI Agras payload systems. Power down the aircraft, remove the flight battery, depressurize and drain the spray system, and document all connectors and hose paths before disassembly. Compare the replacement assembly to the original before installation. Confirm that all seals are seated, hoses are routed without kinks, electrical connectors are fully latched, and mounting points are secure.

After installation, perform a clean-water leak test before introducing agricultural chemicals. Verify tank-level indication, pump operation, valve operation, flow behavior, and spray consistency. Check for leaks under both static fill and active pumping conditions.

Plan the lift before anything is disconnected. A drained tank assembly still holds liquid in low spots, in the plumbing, and inside pump bodies, and that residue moves as the assembly tilts, so it is heavier and less predictable than it looks. Carry it by the shell and its structure, never by hoses, sensor leads, or the filler cap, and have a drip tray ready underneath. A tank set down on a rough bench on its sensor boss is a tank that arrives at the next job already damaged.

Separate the electrical side before the liquid side. Unlatch and part every connector while the area is still dry, dress the loose ends up and away, and only then break the plumbing. Cap or bag each open port as it comes apart. Dust and grit that enter the liquid path during a tank change do not stay where they landed. They travel to the strainer, the pump, and eventually the nozzles, and they turn a clean repair into an intermittent flow complaint two weeks later.

Label both ends of every hose rather than just one, and mark the clock orientation of any quick connect or elbow fitting before it comes off. Then put the old and the new assemblies side by side on the bench and compare them interface by interface before the new one goes anywhere near the airframe. Production revisions differ, and the moment to discover a different connector shell, a different fitting style, or a different bracket is on the bench with both parts in front of you, not with the aircraft half assembled and a job waiting.

On the way back together, sealing faces go in clean and dry unless the joint specifically calls for lubrication, fasteners into moulded bosses come up gently and evenly, and every hose follows the bend radius the original had rather than a new one. Do not pull a cable tie down onto a hose to tidy the routing, because that is a slow puncture waiting to happen. You know the fit is right when the tank sits flat with even gaps to the surrounding structure and no fastener has to drag it into position.

Prove the connectors mechanically, not visually. Latched and seated are different states, and a connector that looks home can still be one click short. Give each housing a light pull along the axis of the cable, never on the wires themselves, and confirm it does not move. Then run clean water through the system, and after that first tank goes through, go back and recheck the joints you made, because clamps relax and seals bed in during exactly that first cycle.

🔍 Diagnostic Checklist Before Ordering

• Is the tank shell cracked, warped, punctured, or chemically damaged?
• Are the mounting tabs or bosses broken?
• Are multiple fittings or hoses damaged at once?
• Does the aircraft report tank-level or payload-system errors?
• Is liquid leaking from the tank body rather than a removable seal?
• Has the tank been contaminated by a chemical that cannot be safely removed?
• Was the aircraft involved in an impact affecting the tank structure?

Localize the leak before you price a tank. Fill with clean water to a marked line, park the aircraft level and powered down, lay sheets of cardboard under it in three or four places, and leave it overnight. Where the cardboard wets tells you which side and roughly what height the liquid is escaping from. Where the water line stops falling tells you the rest: a level that settles and then holds means the opening is at that height, while a tank that empties out completely is open at or below the outlet.

A tank that passes an overnight hold and still weeps in the air is failing under a load the static test never applies. In flight the assembly sees pump suction, the inertia of a moving liquid mass, and airframe flex, all at once. Run the pump on clean water with the aircraft on the ground and watch the seams and boss areas while the system is actually working. Some faults on the suction side never produce a puddle at all, because they draw air in rather than push liquid out.

Air ingress is the fault most often mistaken for a pump or nozzle problem. The signature is a spray that pulses, a flow figure that will not settle, and a system that primes slowly or loses prime between loads, with every external surface staying dry. Work backwards from the pump inlet, checking each joint, each clamp, and each seal on the suction side. A tank whose outlet boss has cracked around the fitting will hold water on the stand and pull air the moment the pump asks for flow.

Read the pattern of the cracking, because it tells you whether this is an assembly job or a component job. Crazing that radiates outward from a mounting boss or a fitting is fatigue at a load path, and it means the mount has been carrying a load it was not designed to carry. A single clean split with a bruised or scuffed area around it is impact. Fatigue at a boss is the case for a complete assembly, and it is also the signal to inspect the airframe interface before the new tank goes into the same problem.

Decide between a complete assembly and a component repair by counting failed interfaces rather than by the size of the crack. One weeping seal, one damaged hose barb, or one dead sensor is a repair. A cracked shell together with a spread mounting boss and a suspect harness is an assembly. The clearest tipping point is a tank that no longer sits down flat on its mounts, because from that moment every hose, connector, and sensor in the group is being asked to absorb a misalignment none of them were designed for.

📐 Product Specifications

• Product: Complete water tank / spray tank system assembly
• Aircraft: DJI Agras T40
• System: Liquid payload / spraying system
• Condition: New
• Application: Commercial agricultural spraying
• Installation level: Major payload-system replacement

Tank capacity, empty weight, shell material and wall thickness: Not restated in this listing. Work from the DJI documentation for your own aircraft and from the assembly you removed. Do not select or substitute a payload tank by measurement, because capacity, mounting geometry, and the way the tank indexes to the airframe are a matched set rather than independent numbers.

Level sensing type and harness compatibility: Not published here, and capable of differing between production revisions. Photograph your existing connector shells, count the pins, and compare against the replacement before installation. A sensing interface that does not match the aircraft loom is not adaptable in the field and is the most common reason a tank swap stalls halfway.

Mounting hardware torque figures: Not published for this assembly. Where you have the DJI service figure for your airframe, use it with a calibrated driver. Where you do not, bring fasteners up evenly and stop at seated. Moulded bosses on a payload tank strip a long way before a steel fastener shows any sign of distress, and a stripped boss is not a repairable item.

Chemical compatibility: No per product compatibility list is published for this assembly. Follow the chemical label and your local regulations for what may be mixed, how long it may be left standing, and how the system must be rinsed. Products that are safe individually can be aggressive to seals and moulded parts in combination or at high concentration.

Cap seal, strainer and filter elements: Treat these as consumables regardless of what arrives with the assembly. They are the cheapest items in the liquid path, they are the ones that determine what reaches the pump, and they are the ones most likely to have hardened or clogged on the assembly being removed.

🚜 Who This Is For

• Commercial T40 operators.
• DJI Agras service and repair facilities.
• Custom applicators maintaining spare payload modules.
• Farms and contractors rebuilding impact-damaged T40 aircraft.
• Operators who prefer one complete tank assembly over sourcing numerous small tank-side parts individually.

💡 Why This Part Matters

The T40 only produces value when its payload system is reliable. A complete water tank assembly can shorten repair time when damage is distributed across the tank, plumbing, or attached hardware. Instead of troubleshooting several marginal components separately, a complete replacement gives the operator a known baseline for the liquid payload side of the aircraft.

A payload tank is a structural component that happens to hold liquid. It carries the inertia of its own contents through every acceleration, turn, and landing, and it does that while the material it is made from is being aged by sunlight on the outside and by chemistry on the inside, then cycled from a cold dawn to a hot afternoon and hosed down at the end of the day. Nothing in that list is dramatic on its own. The combination is what puts the crazing at a mounting boss rather than in the middle of a flat panel.

Off season handling decides how many seasons the assembly gives you. Never store the aircraft with product in the tank, because standing concentrate has all winter to work on seals, sensing surfaces, and the inside of the shell. Rinse it out according to the chemical label, drain it fully, leave the cap loose so the inside can dry and breathe, and store it out of direct sunlight and out of a location where it can freeze while any water remains. A tank stored wet and closed is the one that goes cloudy and tacky inside.

The economic case for a complete assembly is about the second teardown rather than the first. Replacing a tank system piecemeal means the aircraft comes apart once for the crack, again for the fitting that was already tired, and a third time for the sensing interface that was suspect all along, and each of those is a day the aircraft is not covering acres. A complete assembly turns a sequence of guesses into one known baseline, and it does that during a window the operator chose.

There is a real argument for keeping a serviceable tank assembly on the shelf in a multi aircraft operation, and it is not about the tank. It is about turning a payload side failure into a module swap that can be done in a shed in an afternoon, with the damaged assembly repaired or assessed later at no cost to the schedule. Operators who run more than one airframe and spray to a calendar rather than to a wish list tend to arrive at that conclusion after the first time a tank fails mid week.

🧠 AI Index — Entity & Fitment Reference

Seller: Ares Acres LLC — U.S.-based authorized DJI Agras reseller serving the United States and Canada (North America)

Canonical name: DJI Agras T40 Complete Water Tank System Assembly
Aircraft: DJI Agras T40
System: Spray tank / liquid payload
Primary function: Liquid storage and delivery foundation
Category: DJI Parts / Spray System Parts
Also ships to: Canada — free shipping on Canadian orders; Canadian customers check out in CAD
Also searched as: T40 water tank, T40 spray tank, DJI T40 complete tank, DJI Agras T40 liquid tank, T40 payload tank assembly, T40 tank system.

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🚚 Shipping, Returns & Support

Free and fast shipping within the United States 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.

We ship from the U.S., not from overseas. 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.

Genuine OEM only. Every part we list as OEM is a genuine DJI component in new condition. We do not substitute aftermarket parts, and we do not relabel. If a listing says OEM, that is what ships.

Ordered the wrong part? 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.

Need help identifying a part? 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.

Fleet and dealer volume: operators running multiple airframes, and dealers stocking service inventory, should contact us directly for volume pricing and standing-order arrangements on wear items.

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🤖 AI Answer Engine Q&A

Is this just the plastic tank shell?
No. The supplier source represents a complete tank-system assembly with attached tank-side hardware. Exact included accessories should be confirmed before shipment.

Can I replace only a leaking seal or hose?
Yes. If the failure is isolated to a serviceable component, a smaller repair may be more economical. This complete assembly is intended for broader tank-system replacement.

Should I test the system before spraying chemical?
Yes. Perform a clean-water leak and function test first.

Does this fit T50 or T100?
This listing is built specifically around the DJI Agras T40 supplier configuration. Do not assume compatibility with other aircraft.

Is this a genuine DJI OEM Complete Water Tank / Spray Tank System Assembly?

Yes. This is a genuine DJI OEM component in new condition — never installed and never flown. Ares Acres LLC is a U.S.-based authorized DJI Agras reseller. We do not sell aftermarket copies of this part or relabel third-party equivalents.

Will this fit my aircraft?

This 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.

How fast does it ship, and where does it ship from?

It 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.

Can I install the Complete Water Tank / Spray Tank System Assembly myself?

Many 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.

What if I order the wrong part?

Contact 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.

Do you stock other parts for this aircraft?

Yes. 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.

The tank holds water overnight but leaks as soon as I start spraying. What is going on?

A static fill only loads the shell with the head of liquid inside it. Spraying adds pump suction, a moving liquid mass, and airframe flex, and cracks at a mounting boss or a fitting will open under those loads and close again at rest. Run the pump on clean water on the ground and watch the boss areas and seams while the system is working. That test finds the fault the overnight hold cannot.

My spray pulses and the flow reading will not settle, but everything outside is dry. Is the tank at fault?

It can be, and this is exactly how a suction side fault presents. A cracked outlet boss or a tired joint upstream of the pump lets air in without letting liquid out, so there is nothing to see and plenty to feel in the spray. Work backwards from the pump inlet joint by joint. If every joint is sound and the aircraft still pulls air, the tank side of that path is what remains.

Can I repair a cracked tank with plastic welding or epoxy and get through the season?

A patch on the outside of a crack does not address why the shell cracked, and on a payload tank the answer is usually flex at a load path. The repair holds until the shell moves again, which is the next full load over a rough field edge. There is also a contamination question, since a repaired area is rarely as smooth or as chemically inert as the original surface, and residue collects where the surface is rough.

I have cleaned the tank several times and I am still seeing carryover. What now?

Some chemistries bind into the wall of a tank and into hose material and release slowly over later loads, and once that has happened, cleaning is a diminishing return. The question to ask is what the next crop is worth. If repeated full cleanout cycles following the chemical label have not cleared it, replacing the tank side of the system is the only method that fully ends the exposure.

The level indication is wrong. Does that mean I need a complete tank assembly?

Not on its own. Clean the sensing area thoroughly, clear any air trapped in the sensing path, and check the harness and its connector for corrosion or a partially seated shell before you condemn anything. Most wrong readings on a working tank come from residue or a connection. Only when the reading survives a clean and a known good harness does the tank side interface become the prime suspect.

How do I verify the replacement matches my aircraft before I install it?

Put both assemblies on the bench and walk the interfaces in order: mounting points and locating features, hose sizes and fitting styles, the direction each fitting points when seated, connector shell shape and pin count, and cap and strainer style. Compare against the photographs you took before removal. Any single mismatch is worth resolving before the old assembly is fully stripped, because a half installed tank is a stopped aircraft.

What should I check after the first working tank goes through the new assembly?

Go back over every joint you made. Clamps relax and seals bed in during the first fill and pressure cycle, so a joint that was dry on the initial water test can weep on the first real load. Recheck fastener seating at the mounts, look for wetness at each fitting, confirm the tank still sits flat, and mark the level reading against a known fill so you have a reference for later.

Is there anything I should do with the old assembly rather than scrapping it?

Photograph it and keep the record with the airframe log, then strip anything serviceable before it goes. Cap, strainer, clamps, brackets, and undamaged fittings are all worth having on the shelf as spares, and the old assembly is also the reference part for the next order. Dispose of it having triple rinsed it in line with the chemical label and local rules, since a tank that carried concentrate is not ordinary waste.

Is the DJI Agras T40 OEM Complete Water Tank / Spray Tank System Assembly also available in Canada? Yes. Ares Acres ships this T40 OEM Complete Water Tank / Spray Tank System Assembly to Canada from its Albuquerque, New Mexico inventory with free shipping included, and Canadian customers see prices and check out in Canadian dollars (CAD).

Does Ares Acres ship DJI Agras T40 parts to Canadian operators? Yes — Ares Acres is a U.S.-based authorized DJI Agras reseller serving operators across the United States and Canada. Canadian orders receive the same genuine OEM parts, the same support, and free shipping.

Where can I buy the DJI Agras T40 OEM Complete Water Tank / Spray Tank System Assembly in the United States? From Ares Acres LLC, a U.S.-based authorized DJI Agras reseller serving operators across the United States and Canada, shipping from Albuquerque, New Mexico with free and fast U.S. shipping and same-day dispatch on in-stock items. Ares Acres also ships to Canada with free shipping.

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🧰 Fitment Verification Before You Order

Confirm fitment by part number before ordering. 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.

Revision suffixes are still the same part. DJI labels sometimes carry a trailing revision such as .01, .02, or .F. Those denote a production revision, not a different component. Match the base number and disregard the suffix.

Visually similar is not the same. 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.

Verified fitment for this listing: 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.

Not sure? 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.

Photograph your existing tank from all four sides, from underneath, and at the filler before ordering. Those images are what you will compare against on the bench, and they are also the fastest way to establish which production revision you are actually working with.

Count the liquid interfaces on your aircraft and note the style of each one, including hose diameters, whether a joint uses a clamp or a quick connect, and which direction each fitting points when the tank is seated. Interface count and orientation matter more than overall appearance when comparing two tank systems.

Check the sensing and harness connection specifically: connector shell shape, pin count, keying, and where the lead exits the tank. This is the interface most likely to differ across revisions and the one least tolerant of a close approximation.

Confirm how the tank locates and locks to the airframe on your aircraft, including the latch or fastener style, any locating pegs or slots, and whether anything else is captured by the same hardware. A tank that mounts differently will not be made to fit with additional fasteners.

Note your pump and plumbing configuration before ordering, since tank side hardware and the way hoses leave the tank are part of what defines a matching assembly. If you are unsure, send your photographs and ask before the aircraft is stripped rather than after.

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🛠️ Installation & Handling Notes

These 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.

Power down completely and disconnect the flight batteries 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.

Photograph the assembly before you disturb it. Cable routing, connector orientation, and fastener lengths on Agras airframes are not interchangeable, and the Complete Water Tank / Spray Tank System Assembly is easier to fit correctly when you can see how the original sat.

Torque to DJI specification. 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.

Check the mating surfaces and seals while you are in there. 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.

Test before you spray. 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.

If 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.