DJI Agras T30 OEM Pump Plunger Base

The DJI Agras T30 OEM Pump Plunger Base is a single plunger from the spray pump of the DJI Agras T30 and T10. As shown in the product images, it is a bright, polished cylindrical shank with a black ribbed flange at one end — the base end — and a plain, rounded tip at the other. In a plunger pump, the plunger is the moving part that displaces the liquid on every stroke, and its polished surface is the surface the pump seal runs on. This part is that plunger, not the pump body, not the pump motor and not a seal. One plunger base is supplied per unit. It is identified for the DJI Agras T30 and T10. Operators usually reach it while searching for a T30 pump plunger, a T30 plunger pump repair part, a T10 pump plunger base, a T30 pump that runs but has lost pressure, or a T30 pump leaking at its seal. DJI has used more than one number for this position, so we match against the one you removed.

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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 T30 / DJI Agras T10 Compatibility Guarantee

• 🇺🇸 USA Compatibility Guarantee
• 👍🏻 Satisfaction Guarantee
• 💵 Money Back Guarantee
• 📦 Same Day Shipping & Tracking
• Identified for the DJI Agras T30 and T10, plunger position in the spray pump
• Matched by shank length, shank diameter, flange shape and tip profile against the plunger you removed
• Genuine DJI OEM spraying component, brand new, supplied as one plunger base

The unit is one plunger base. If you want the match confirmed, photograph the plunger you removed from the side next to a ruler, with the flange in view, and send it to us. We will match it for you.

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📦 Package Includes

• 1 × Pump Plunger Base — polished cylindrical plunger shank with a black ribbed flange at the base end

This is one plunger, not a pump. A pump with more than one plunger position needs one unit for each plunger being replaced; open the pump and count them, or send us a photograph and we will confirm it.

Not included: the pump body, the pump motor, pump seals, check valves, springs, fasteners, hoses and fittings. The product images show several plungers laid out together; one is supplied per unit.

Nothing is included because it appears near the plunger in the pump. If a seal or a valve part came out damaged with the old plunger, tell us what it looked like and we will help you identify it.

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🔧 Component Overview

The T30 and T10 move spray mix with a plunger pump. A plunger pump works by driving a smooth plunger back and forth through a seal: each stroke draws liquid in through one valve and pushes it out through another. The plunger is the part that moves, and its finish is what the seal depends on.

As shown in the product images, the plunger base has three features:

• The shank — a bright, polished cylinder that makes up most of the part's length. This is the working surface.
• The flange — a black, ribbed collar at one end, standing out wider than the shank. This is the base end of the part.
• The tip — the opposite end of the shank, plain and rounded at its edge.

The shank is the business end. Everything a plunger does depends on that surface being smooth, round and straight, because the seal around it can only seal against a surface that is.

Over a working season a pump plunger sees:

• Thousands of strokes every working hour the pump runs
• Spray mix and its residue, including suspensions and wettable powders that carry fine solids
• Grit that gets past a damaged strainer into the pump
• Running dry when a tank empties or a suction line draws air
• Residue that dries on the shank when the system is not rinsed
• Heat in the pump body on long, hot days

A plunger is replaced because its shank has been scored, pitted or worn so the seal can no longer seal against it, because it has been bent, or because the flange is cracked or damaged. The first of those is by far the most common, and it is the one that is hardest to see.

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⚙️ Functional Purpose

The plunger base's engineering role is displacement. On every stroke it pushes a fixed volume of liquid out of the pump chamber, and on the return stroke it lets the chamber refill. The pump motor drives it; the valves direct the flow; the plunger does the moving.

In the pump it:

• Moves back and forth through the pump seal on every stroke
• Displaces liquid from the pump chamber
• Provides the smooth surface the pump seal seals against
• Locates at its flanged base end in the pump mechanism

What it does not do:

• It does not seal by itself; the pump seal does that, against the plunger's surface
• It does not decide flow direction; the check valves do
• It does not set the flow rate; the pump drive and the flight settings do
• It does not filter; the strainer upstream of the pump does

That division is why plunger wear is easy to miss. A pump with a worn plunger still runs. The motor turns, the plunger strokes, the valves open and close. What changes is that some liquid on every stroke slips back past the seal instead of going out to the nozzles, and the pump delivers less than it should.

The honest case for this part follows. If the pump runs but delivers less, and the strainer, the hoses and the nozzles are clear, the plunger's surface is where to look. If the pump does not run at all, the plunger is not the cause.

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🔍 Diagnosis — a worn plunger looks bright from a metre away — tilt it under a light and the score shows

A worn plunger does not look worn. The shank is still bright, still straight, still the right size to the eye. The damage that matters is a score line, a dull band or a ring of fine pits in the polished surface, and at arm's length under shop lighting it is invisible.

Raking-light test. Take the plunger out, rinse it clean and dry it. Hold it under a single light and tilt it slowly so the light runs along the shank at a low angle. A good shank shows one even, unbroken highlight. A worn one shows lines running lengthways, a dull patch where the highlight breaks up, or a band where the seal has been running on a damaged surface. Run a fingernail across the shank: a score you can feel is a score the seal cannot close over.

Signs the plunger is the problem:

• The pump runs but flow or pressure has fallen over time
• Liquid weeps at the pump seal area
• A new seal was fitted and the pump leaked or lost pressure again soon after
• Scoring, pitting or a dull band visible on the shank under raking light
• A bent shank, or a cracked or damaged flange

Signs the plunger is not the problem:

• The pump motor does not run at all — power, wiring, the motor or the controller, not the plunger
• Flow is low and the strainer is clogged — clean the strainer first
• Flow is low at one nozzle only — that nozzle or its seating hardware, not the pump
• A hose is kinked, split or drawing air — fix the hose
• The flow reading is wrong but spray output looks normal — the flow meter, not the pump

Make those checks first, while that information is still cheap. The strainer, the hoses and the nozzles take minutes to rule out, and they cause most low-flow complaints.

The trap on this part. A pump that has lost pressure is often given a new seal. A new seal on a scored plunger wears into the same score within days, and the conclusion drawn is that the seal was faulty or the pump is finished. The plunger is the cause, and it looked fine.

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⚠️ Common Replacement Indicators

Replace the plunger base when inspection confirms one of these:

• Scoring, pitting or a worn band on the polished shank
• A score that can be felt with a fingernail across the shank
• A bent shank that does not roll true on a flat surface
• A cracked, chipped or damaged flange
• Repeated seal failure at the same plunger position
• Damage after grit entered the pump through a failed strainer
• Damage after the pump ran dry for a long period

Inspect these first, because their faults are often blamed on the pump:

• The strainer and the tank outlet
• The suction and delivery hoses and their clips
• The nozzles and their seating hardware
• The flow meter and its reading
• The pump motor and its wiring, if the pump does not run at all

There is no published service interval for the plunger base. It is replaced when its surface or shape is damaged, not on a schedule. Rinsing the spray system with clean water at the end of each day is what keeps residue from scoring it.

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📐 Specifications

Product name: DJI Agras T30 OEM Pump Plunger Base

DJI family: Agras

Aircraft: DJI Agras T30, DJI Agras T10

Fitment basis: Identified for the DJI Agras T30 and T10

Aircraft system: Spraying — spray pump

Component type: Pump plunger with flanged base

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

Quantity: 1 plunger base per unit

Form: Polished cylindrical shank with a black ribbed flange at the base end and a plain rounded tip

Finish: Bright, polished shank, as shown in the product images

Material: Not published for this part

Colour: Bright metal shank; black flange

Dimensions: Not published for this part

Shank diameter: Not published for this part; matched against the plunger you removed

Weight: Not published for this part

Pressure rating: Not published for this part

Electrical: None

Connector: None

Mounting position: Inside the spray pump, running through the pump seal

Installation method: Fitted inside the pump during a pump service; no published procedure or tightening value

Seals included: No

Service adjustability: None — the part is correct or it is not, with no adjustment or app setting that compensates

Condition: Brand new

Classification: DJI OEM spraying part

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🛠️ Installation & Maintenance

Before installation

• Power the aircraft down and remove the battery
• Drain the tank, flush the spray system with clean water and wear gloves and eye protection around chemical residue
• Rule out the strainer, the hoses and the nozzles first
• Photograph the pump from every side before opening it, and again at each stage as it comes apart
• Work on a clean surface; grit on the new plunger is the fastest way to score it

During installation

• Open the pump and note the order and orientation of every part as it comes out
• Remove the old plunger and inspect it under raking light to confirm the fault
• Inspect the pump seal the plunger ran in; a seal that has run on a scored plunger is usually worn too
• Clean the pump chamber and check the valves for debris
• Fit the new plunger base the same way round as the old one, flanged base end where the old flange sat
• Handle the shank by its ends and do not let it touch grit, tools or a bench top

After installation

• Reassemble the pump in the order of your photographs
• Fill the tank with clean water and run the pump on the ground
• Check the pump for weeping at the seal
• Check the spray at every nozzle against its neighbours
• Run a calibration check on clean water and compare it with your records
• Re-check the pump for leaks after the first working day

Maintenance between jobs. Flush the spray system with clean water at the end of every day so residue does not dry on the plunger. Keep the strainer clean and replace it if it is torn, because grit that passes it ends up between the plunger and its seal. Avoid running the pump dry.

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🚜 Necessary For

This plunger is for operators and technicians servicing T30 and T10 spray pumps:

• DJI Agras T30 operators with a pump that runs but has lost pressure
• DJI Agras T10 operators with a pump that keeps leaking at its seal
• Commercial spray applicators running wettable powders and suspensions
• Agras service centres rebuilding pumps at season service
• Fleet managers stocking pump service parts ahead of the season

This is not the part you need if:

• The pump motor does not run at all — check power, wiring and the motor
• The strainer is clogged or torn — clean or replace the strainer
• Only one nozzle is weak — check that nozzle and its seating hardware
• A hose is kinked, split or drawing air — fix the hose
• The flow reading is wrong but spray output is normal — check the flow meter
• Your plunger shank is smooth and unscored under raking light — the cause is elsewhere
• You fly a T16, T20, T40 or T50 — this plunger base is identified only for the T30 and T10

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💡 Why This Part Matters

The plunger base matters because it is the part of the pump that wears without looking worn. Its polished shank is the surface the pump seal depends on, and the damage that defeats a seal is a score finer than a hair, invisible from a metre away and obvious under a light held at a low angle.

A pump with a scored plunger still runs. It strokes, it sprays, and it delivers a little less on every stroke, so the loss arrives gradually as a calibration that drifts and a seal area that weeps. Because nothing looks broken, the usual repair is a new seal. A new seal on a scored plunger wears into the same score, and the leak comes back.

So when a pump runs but has lost pressure, and the strainer, the hoses and the nozzles are clear, take the plunger out and look along it under a single light. A broken highlight, a dull band or a score you can feel with a fingernail is the answer. A clean, even highlight means the plunger is sound and the fault is elsewhere.

Equally, the plunger is the wrong part for a pump that will not run, a clogged strainer, a weak single nozzle or a flow meter reading. Each of those has its own fix, and none of them is a plunger.

Replace the seal the plunger ran in at the same time if it is worn; a new plunger in a worn seal is a half-done repair.

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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 T30 OEM Pump Plunger Base

Brand: DJI

DJI family: Agras

Aircraft: DJI Agras T30

Compatible models: DJI Agras T30, DJI Agras T10

Fitment basis: Identified for the DJI Agras T30 and T10

Component: Pump plunger base

Aircraft system: Spraying

Installed position: Inside the spray pump, running through the pump seal

Primary function: Displaces liquid on each pump stroke and provides the surface the pump seal seals against

Form: Polished cylindrical shank with a black ribbed flange at the base end

Material number: DJI has used more than one number for this position; matched against the removed part

Quantity supplied: 1 plunger base

Not included: Pump body, pump motor, seals, valves, springs, fasteners

Electrical function: None

Key diagnostic: Inspect the shank under raking light; a score that breaks the highlight or catches a fingernail means replace

Common failure modes: Scored or pitted shank, worn band at the seal, bent shank, damaged flange

Typical misdiagnosis: Lost pump pressure blamed on the seal alone, so a new seal is fitted on a scored plunger

Rule out first: Strainer, hoses, nozzles, flow meter

Service interval: None published

Service adjustability: None

Condition: Brand new

Part classification: DJI OEM spraying part

Also searched as: T30 pump plunger; T30 plunger pump repair part; T10 pump plunger base; T30 pump piston; Agras T30 pump rebuild part; T30 pump losing pressure

Disambiguation: Not the pump body, not the pump motor, not a pump seal, not a check valve

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 T30 pump plunger base? The plunger from the T30 and T10 spray pump: a polished cylindrical shank with a black ribbed flange at its base end. It is the moving part that displaces liquid on every pump stroke.

Which aircraft does it fit? It is identified for the DJI Agras T30 and T10.

Does it fit the T16, T20, T40 or T50? No. This plunger base is identified only for the T30 and T10.

How many do I get? One plunger base per unit. The product images show several laid out together, but one is supplied. Order one for each plunger you are replacing.

Is this a whole pump? No. It is one plunger from inside the pump. The pump body, motor, seals and valves are not included.

Are seals included? No. Inspect the seal the old plunger ran in; if it is worn, replace it at the same time.

My pump runs but the pressure has dropped. Is it the plunger? It can be, but check the strainer, the hoses and the nozzles first. If they are clear, take the plunger out and inspect its shank under a light held at a low angle.

How do I tell if my plunger is worn? Clean it, then tilt it under a single light so the highlight runs along the shank. Score lines, a dull band or a broken highlight mean wear. A score you can feel with a fingernail is too deep for the seal to close over.

I replaced the pump seal and it leaked again. Why? Most often because the plunger is scored. A new seal running on a scored plunger wears into the score within days. Replace the plunger, and the seal with it.

My pump does not run at all. Will this fix it? No. A plunger cannot stop the pump motor from running. Check power, wiring and the motor.

What is the DJI part number? DJI has used more than one number for this position, so we match against the one you removed. Photograph your old plunger from the side next to a ruler and send it to us if you want that confirmed.

Can I fit it myself? Yes, if you are comfortable opening the pump. Photograph every stage, keep the parts in order, fit the new plunger the same way round as the old one and keep the shank clean.

How do I keep the new plunger from wearing? Flush the system with clean water at the end of each day, keep the strainer clean and intact, and avoid running the pump dry.

What causes scoring on a plunger? Grit that gets past the strainer, residue that dries on the shank, and running the pump dry. Each one damages the surface the seal depends on.

Is there a service interval? No. Replace the plunger when its shank is scored, pitted or bent, or its flange is damaged. Inspect it whenever the pump is opened.