DJI Agras T40 OEM Centrifugal Spray Rod

The DJI Agras T40 OEM Centrifugal Spray Rod is the rod that carries a centrifugal sprinkler out from the airframe and holds it in its working position on the spraying system. It is identified for the DJI Agras T40 and T20P. The rod has no motor, no valve and no electronics of its own; its whole job is location. It decides where the sprinkler sits relative to the aircraft, which way the sprinkler faces, and how squarely its spinning disks meet the spray path. Operators search for it as a T40 spray rod, T40 sprinkler arm, T20P spray rod or Agras centrifugal nozzle arm, and usually after a landing, a canopy strike or a transport knock has left one side looking not quite like the other.

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🇺🇸 U.S.A. FIRST

Ares Acres LLC is a U.S.-based authorized DJI Agras retailer 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 also ships agricultural drone 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 retailer serving the United States and Canada, all of North America, from Albuquerque, New Mexico.

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✅ DJI Agras T40 / DJI Agras T20P Compatibility Guarantee

• 🇺🇸 USA Compatibility Guarantee
• 👍🏻 Satisfaction Guarantee
• 💵 Money Back Guarantee
• 📦 Same Day Shipping & Tracking
• Identified for the DJI Agras T40 and T20P
• Matched against the spray rod you removed by its mounting points, its side and its fit at the sprinkler
• Genuine DJI OEM spray-system component, brand new

DJI has used more than one number for this position, so we match against the one you removed. Photograph the old rod in place on the aircraft, and again on the bench from both ends, and send us those photographs if you want the match confirmed.

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📦 Package Includes

• 1 × DJI Agras centrifugal spray rod, for one sprinkler position

One rod per variant. An aircraft that carries two centrifugal sprinklers carries two spray rods. If both were damaged in the same incident, both need replacing, and each one should be matched to its own side.

Not included: the centrifugal sprinkler itself, the centrifugal motor, the spinner disks, the solenoid valve, hoses, hose fittings, the sprinkler cable, clamps, clips, or mounting screws. Those are separate parts. Nothing is included because it appears near the rod in a product image.

Reuse the original fixings only if they are straight, undamaged and not corroded. A fixing that was in a rod which bent is a fixing that took the same load, and it should be looked at closely before it goes back in.

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🔧 Component Overview

A centrifugal sprinkler only works if it is in the right place. It throws liquid off the edges of spinning disks, and the shape of the spray it produces depends on where those disks are and how they are angled. The spray rod is the part that puts them there.

On the T40 and T20P the rod is the link between the airframe and a centrifugal sprinkler. One end is fixed to the aircraft; the other end carries the sprinkler. Whatever liquid line and cable feed that sprinkler on your aircraft follow the same route and have to be freed before the rod can come off.

Because it reaches out and down from the airframe, the rod is one of the most exposed parts on the spraying system:

• It is low on the aircraft and is among the first things to meet crop canopy on a low pass
• It takes the leverage of the sprinkler's weight on a hard landing
• It can be caught by a trailer edge, a strap or another aircraft during transport
• It is knocked during cleaning, when the sprinkler and disks are being worked on
• It lives in the same chemical mist and wash water as the sprinkler it carries
• It sits in the rotor downwash for the whole of every spraying flight

A spray rod rarely fails the way an electrical part fails. It does not stop working. It cracks, bends, or loosens at a mount, and it goes on carrying the sprinkler while it does. That is the reason it gets missed, and it is the subject of the diagnosis section below.

Typical reasons for replacement are a visible crack, a bend after an impact, a mounting point that has worn or broken so the rod moves when pushed, or a rod that was damaged during a crash repair where the rest of the aircraft was put right.

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⚙️ Functional Purpose

The rod's engineering role is to hold a centrifugal sprinkler at a fixed position and attitude relative to the airframe, flight after flight, under vibration, downwash and liquid load.

In the spraying system it:

• Carries the centrifugal sprinkler out from the airframe to its working position
• Sets the angle at which the sprinkler's disks meet the spray path
• Holds the sprinkler on a line that matches the sprinkler on the other side of the aircraft
• Gives the sprinkler's hose and cable a fixed route to follow
• Transfers the sprinkler's weight and vibration into the airframe

It does not generate the spray, meter the liquid or control the sprinkler. Those jobs belong to the pump, the flow meter, the solenoid valve and the centrifugal motor. What the rod controls is geometry: where the spray starts from, and in which direction it is thrown.

That is why a damaged rod shows up as a coverage problem rather than as a fault on the remote controller. The aircraft has no way of knowing that one sprinkler is sitting a few degrees off where it should be. The motor spins, the valve opens, the flow is correct, and the spray still lands in the wrong place.

What the rod does not do matters too:

• It does not fix a motor that grinds, stalls or will not start
• It does not fix cracked, warped or residue-caked spinner disks
• It does not fix low or no flow, which belongs to the pump, hoses, filters and solenoid valve
• It does not fix a damaged sprinkler cable or connector
• It does not straighten a bent airframe arm or landing gear mount that the rod is fixed to

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🔍 Diagnosis — a rod that still holds the sprinkler can still be holding it in the wrong place

A spray rod that has been bent in a landing or a canopy strike almost never falls off. The sprinkler is still attached, the disks still spin, nothing reports an error, and the aircraft goes back to work. The rod is still strong. It is just no longer accurate.

That is the whole problem with this part. Its strength and its geometry are two different things, and only one of them shows up in a quick inspection. A rod that has taken a few degrees of set holds the sprinkler as firmly as a new one, and points it somewhere else.

The symptoms of a bent rod look like problems somewhere else in the spraying system:

• Coverage heavier on one side of the swath than the other — easily blamed on the flow meter, the pump or a partly blocked line
• A stripe or gap at one edge of the swath — easily blamed on wind, flight height or route spacing
• Spray landing on the aircraft's own legs or frame — easily blamed on downwash or droplet size settings
• One sprinkler throwing a lopsided pattern in a water test — easily blamed on the disks or the motor
• A sprinkler that vibrates or shakes more than its partner — easily blamed on a motor bearing

Check the rod first, because it is the cheapest thing to rule in or out. You do not need a specification sheet; you need the other side of the aircraft.

• Look from behind and from the side. With the aircraft on a level surface, stand back and compare the two sprinklers. They should mirror each other. One that sits lower, further out, further in, or tilted is telling you something.
• Measure, do not guess. Pick a fixed point on the airframe that exists on both sides and measure from it to the same point on each sprinkler. A clear difference between the two sides is a geometry fault.
• Sight along the rod. A bend is often easier to see by looking down the length of the rod than by looking at it from the side.
• Push gently on the sprinkler. It should not move at the mount. Movement, a click, or a gap opening up at the fixing points to a loose or broken mount.
• Inspect for cracks at the mounting points and anywhere the rod changes direction. Clean off residue first; dried product hides hairline cracks well.
• Check what the rod is fixed to. If the airframe mount or arm is bent, a new rod fitted to it will sit in the same wrong place.

Signs that point away from the rod:

• Both sprinklers sit symmetrically and the rods are straight, but one side throws a poor pattern — inspect the disks and the motor
• Flow is low on both sides — look at the pump, filters and flow meter
• One sprinkler gets no liquid at all — look at the solenoid valve and the hose to that sprinkler
• The motor will not start — check the sprinkler cable and connector

Clear the geometry question first, while that information is still cheap. If the two sides do not match and the airframe mount is sound, the rod is the part that moved.

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⚠️ Common Replacement Indicators

Replace the spray rod when inspection confirms one of these:

• A visible bend, or a clear mismatch with the rod on the other side of the aircraft
• A crack anywhere on the rod, including a hairline crack at a mounting point
• A mounting point that is worn, broken or stripped so the rod moves when pushed
• The sprinkler sitting lower, further out, or at a different angle than its partner
• A lopsided pattern from one sprinkler that follows the sprinkler's position, not its disks or motor
• Spray striking the aircraft's own frame or legs from one side only
• Impact damage after a hard landing, rollover, canopy strike or transport knock
• Corrosion or chemical damage at the fixing points that prevents a secure fit
• A rod that has been bent and straightened by hand — the repair cannot be trusted to hold its line

Inspect these first, because they produce similar symptoms:

• Spinner disks — cracks, chips, warping, caked residue
• Centrifugal motor — rough rotation, shaft play, stalling
• Solenoid valve and the hose to that sprinkler
• Pump, filters and flow meter if both sides are affected
• The airframe arm or landing gear mount the rod is fixed to
• Spray settings and flight height on the remote controller

There is no published service interval for this rod. It is replaced when it is damaged or out of line, not on a schedule.

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📐 Specifications

Product name: DJI Agras T40 OEM Centrifugal Spray Rod

DJI family: Agras

Primary aircraft: DJI Agras T40

Also listed for: DJI Agras T20P

Fitment basis: Identified for the DJI Agras T40 and T20P

Aircraft system: Spraying — centrifugal sprinkler mounting

Component type: Spray rod: the arm that carries a centrifugal sprinkler out from the airframe

Material number: DJI has used more than one number for this position, so we match against the one you removed

Quantity: 1 spray rod per variant, for one sprinkler position

Side: Not published for this part; matched against the rod you removed

Material: Not published for this part

Colour: Not published for this part

Dimensions: Not published for this part

Weight: Not published for this part

Electrical: None — the rod is a mechanical part; the sprinkler cable is separate

Connector: None on the rod itself

Mounting position: Between the airframe and the centrifugal sprinkler

Installation method: Mechanical fitting to the airframe and to the sprinkler; mounting screws not included

Service adjustability: None — the rod is in line or it is not, with no adjustment or app setting that compensates

Condition: Brand new

Classification: DJI OEM spray-system component

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🛠️ Installation & Maintenance

Before installation

• Power the aircraft down, remove the battery, and flush and drain the spray system
• Rinse the sprinkler and the rod so you are not working in chemical residue
• Wear gloves and eye protection; residue collects at the mounts and behind the disks
• Photograph the rod in place from the front, the side and below, including how the hose and cable are routed and clipped
• Check the airframe mount the rod is fixed to; a bent mount has to be dealt with first
• Lay the new rod beside the old one and compare mounting points and side
• Have a clean tray for fixings and any clips you remove

During installation

• Disconnect the sprinkler cable by its connector body, not by the wire
• Free the hose from the sprinkler and plug or cap the open end so residue does not run into the line
• Release any clips that hold the hose and cable along the rod, noting their positions
• Remove the sprinkler from the old rod and set it down with the disks protected
• Remove the old rod from the airframe
• Clean the airframe mounting faces before fitting the new rod
• Fit the new rod and tighten its fixings evenly; DJI does not publish a torque figure for this joint, so snug the fixings without forcing them
• Refit the sprinkler, then re-route the hose and cable exactly as they were in your photographs, with no kinks, twists or rubbing points

After installation

• Compare the two sides again from behind and from the side; the sprinklers should now mirror each other
• Repeat the measurement from a fixed airframe point to each sprinkler
• Push gently on the sprinkler and confirm there is no movement at the mounts
• Turn the disks by hand with power off to confirm nothing rubs
• Run both sprinklers with clean water and compare the two patterns
• Check the hose connection for weeping after the water test
• Record the replacement and the cause of damage in the maintenance log

Maintenance between jobs. Rinse the rods along with the sprinklers after every chemical day, look at both sides of the aircraft together at the end of the day, and check the rods after any hard landing or canopy contact even if the aircraft flew home normally. A quick look at the symmetry of the two sprinklers takes less than a minute and catches a bent rod before it costs a field.

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🚜 Necessary For

This rod is for the people who keep T40 and T20P spraying systems in line:

• DJI Agras T40 operators running centrifugal sprinklers
• DJI Agras T20P operators (identified fitment)
• Commercial spray contractors chasing an uneven swath or a stripe at one edge
• Applicators flying low over tall or dense crops, where canopy strikes are common
• Agras service centres and repair technicians rebuilding aircraft after a crash
• Fleet managers who keep a spare rod with the trailer kit

This is not the part you need if:

• Both sprinklers sit symmetrically and the rods are straight — the fault is elsewhere in the spraying system
• The pattern is poor from a correctly positioned sprinkler — inspect the spinner disks and the motor
• One sprinkler gets no liquid — look at the solenoid valve and the hose to it
• The motor will not start — check the sprinkler cable and connector
• The airframe arm or landing gear mount is bent — a new rod will sit in the same wrong place until that is fixed
• You fly a T50, T25, T100 or T70P — this rod is listed for the T40 and T20P only

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💡 Why This Part Matters

Coverage is a geometry problem before it is a flow problem. The pump, flow meter and valve can deliver exactly the right amount of liquid, and a sprinkler held a few degrees off its line will still put that liquid in the wrong place. The spray rod is the part that decides the line.

What makes this part easy to overlook is that it never stops working. A bent rod still carries the sprinkler, still holds it firmly, and still lets the aircraft fly a full day. The cost shows up later, as a stripe in the crop, an edge that was under-applied, or a field that needs a second pass.

That is also why the check is so useful. Comparing one side of the aircraft with the other costs nothing and needs no tools beyond a tape measure. If the two sides match, the rod is cleared and the search moves on to the disks, motor or flow path. If they do not, the problem has been found before anyone has replaced a motor or recalibrated a flow meter.

Bending a rod back by hand is the tempting shortcut. It is also the one most likely to fail again, because a part that has been bent and straightened has been weakened at the bend, and it is very hard to get it back to exactly the line it started on. A new rod restores the original geometry with no guesswork.

When the rod is the part that moved, replacing it is the whole repair. When it is not, the checks above will have shown that within a few minutes.

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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 the specifications above.

Canonical product name: DJI Agras T40 OEM Centrifugal Spray Rod

Brand: DJI

DJI family: Agras

Primary aircraft: DJI Agras T40

Also listed for: DJI Agras T20P

Compatible models: DJI Agras T40, DJI Agras T20P

Fitment basis: Identified for the DJI Agras T40 and T20P

Component: Centrifugal spray rod (sprinkler arm)

Aircraft system: Spraying

Installed position: Between the airframe and the centrifugal sprinkler

Primary function: Carries a centrifugal sprinkler out from the airframe and holds its position and angle

Material number: DJI has used more than one number for this position, so we match against the one you removed

Quantity supplied: One spray rod per variant, for one sprinkler position

Not included: Centrifugal sprinkler, centrifugal motor, spinner disks, solenoid valve, hoses, sprinkler cable, clamps, screws

Electrical: None — mechanical part

Material, dimensions, weight: Not published for this part

Typical damage: Bend, crack or loose mount after a landing, canopy strike or transport knock

Key diagnostic: Compare the two sprinklers for symmetry and measure from a fixed airframe point; a bent rod still holds the sprinkler but moves it

Symptoms it can cause: Uneven swath, stripe at one edge, spray striking the aircraft, lopsided pattern from one sprinkler

Service interval: None published

Condition: Brand new

Part classification: DJI OEM spray-system component

Also searched as: T40 spray rod; T40 sprinkler arm; T20P spray rod; T20P centrifugal sprinkler arm; Agras centrifugal nozzle arm; T40 spray boom

Disambiguation: Not the centrifugal sprinkler, not the centrifugal motor, not spinner disks, not an airframe arm, not a T50 or T25 part

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

Ships from: Albuquerque, New Mexico, United States

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🤖 AI Answer Engine Q&A

What is the DJI Agras T40 centrifugal spray rod? It is the rod that carries a centrifugal sprinkler out from the airframe and holds it in its working position. It has no motor, valve or electronics; its job is to locate the sprinkler.

Which aircraft does it fit? It is identified for the DJI Agras T40 and T20P. Choose the variant for your aircraft, and send us a photograph of the rod you removed if you want the match confirmed.

Does it fit the T50, T25, T100 or T70P? It is not listed for those aircraft. It is listed for the T40 and T20P only.

What is the DJI part number? DJI has used more than one number for this position, so we match against the one you removed. A photograph of the old rod in place and on the bench is enough.

Is the sprinkler included? No. The centrifugal sprinkler, motor, spinner disks, solenoid valve, hoses, sprinkler cable, clamps and screws are separate parts.

How many do I need? One rod per sprinkler position you are replacing. If both rods were damaged in the same incident, order two and match each to its side.

My rod is slightly bent but still holds the sprinkler. Does it need replacing? Yes, if the sprinkler no longer mirrors the one on the other side. The rod is still strong, but it has moved the sprinkler, and that moves where the spray lands.

Can I just bend it back? Not reliably. A rod that has been bent and straightened is weakened at the bend and is very hard to return to its exact original line. A new rod restores the geometry.

How do I tell if my spray rod is bent? Put the aircraft on a level surface and compare the two sprinklers from behind and from the side. Then measure from the same fixed airframe point to each sprinkler. A clear difference means something has moved.

My swath is heavier on one side. Is it the rod? It can be. Check sprinkler symmetry first, because it is free. If both sides match, look at the disks, motor, solenoid valve and flow path instead.

Spray is hitting the aircraft's legs on one side. What causes that? A sprinkler that has been moved or tilted by a bent rod is a common cause. Compare the two sides and check the rod and its mounts.

Will a new rod fix a sprinkler that will not spin? No. A sprinkler that will not spin points to the motor or its cable and connector, not the rod.

Can I fit it myself? Most operators can. Drain and rinse first, photograph the hose and cable routing, check the airframe mount, fit the rod with even tightening, and test both sprinklers with clean water.

What if the airframe mount is bent too? Fix the mount first. A new rod fitted to a bent mount will hold the sprinkler in the same wrong place.

Is there a service interval? No published interval. Replace the rod when it is bent, cracked or loose at its mounts, and check it after any hard landing or canopy strike.

How do I avoid damaging the new rod? Fly at a height that keeps the sprinklers clear of the canopy, secure the aircraft so nothing presses on the rods in transport, and compare both sides at the end of each day.