DJI Agras T100 OEM Optical Window Sealing Ring (YC.JG.MY000651)

DJI Agras T100 OEM Optical Window Sealing Ring (YC.JG.MY000651) — This is the optical window sealing ring that seals and protects in the front frame and sensor cluster of the DJI Agras T100. Seals are the cheapest parts on the aircraft and the most common reason expensive ones die: one hardened ring lets chemical and washdown water reach electronics and bearings that cost hundreds to replace. Replacing them on schedule is the cheapest insurance in the fleet. DJI material number YC.JG.MY000651. Optical Window Sealing Ring | Sealing & Protection | DJI Agras T100 Consumable | Field-Ready OEM Replacement Component.

DJI Material Number (SKU): YC.JG.MY000651 — this is the official DJI part number for this exact component. Match it to your parts diagram or your old part's label to confirm fitment before ordering.

🇺🇸 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 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.

✅ DJI Agras T100 Compatibility Guarantee

• 🇺🇸 USA Compatibility Guarantee
• 👍🏻 Satisfaction Guarantee
• 💵 Money Back Guarantee
• 📦 Same Day Shipping & Tracking
• DJI material number YC.JG.MY000651 — listed verbatim on the official DJI Agras T100 parts breakdown
• Supplier-listed fitment: DJI Agras T100
• Brand new condition — never installed, never flown

📦 Package Includes

• 1 × OEM Optical Window Sealing Ring (YC.JG.MY000651)
• OEM protective packaging

🔧 Component Overview

The DJI Agras T100 OEM Optical Window Sealing Ring is the OEM optical window sealing ring serving the front frame and sensor cluster of the DJI Agras T100, where carrying the forward sensors and RTK hardware through vibration and weather only works if the sealing holds.

Carrying the forward sensors and RTK hardware through vibration and weather is the job description for the front frame and sensor cluster, and this component is part of how it gets done. The T100 is a working machine — it earns its keep in fill-and-fly cycles, not hangar hours — and every component in the front frame and sensor cluster is sized, shaped, and specified around that duty. On the official parts diagram it sits alongside Front Frame Aluminum Tube, Screw M40-HC01400140-070039-0003-Y, Power Cable Clamp B0.

Ignore a failing optical window sealing ring and the bill compounds: downtime in the middle of an application window, collateral wear on the parts around it, and jobs that slip to a competitor while the aircraft sits. Replacing it costs a part; not replacing it costs acres. That trade only runs one direction.

For professional farmers, aerial applicators, and commercial drone operators, this component is how the front frame and sensor cluster stays field-ready instead of becoming the reason the aircraft sits.

This is a working part on a working aircraft.

The T100 works brutally hard for its living, including:

• Carrying the forward sensors and RTK hardware through vibration and weather
• Dawn-to-dusk spray campaigns during narrow application windows
• Repeated fill-fly-return cycles with minutes on the ground between loads
• Full-payload takeoffs from field edges, dozens of times per day
• Chemical exposure from fungicides, herbicides, insecticides, and foliar fertilizers
• Pressure-washer rinse-downs at the end of every spray day
• Vibration from eight propulsion motors running at working power
• Transport bouncing on trailers and truck beds between fields
• Temperature swings from cold morning starts to full-sun afternoons

What attacks this component in the field:

• Chemical attack from every product in the tank
• UV exposure hardening exposed surfaces
• Compression set from years in the same seat
• Thermal cycling stiffening the material
• Pressure-washer jets driving at the seal line
• Grit embedding in sealing surfaces
• Ozone and weather aging the elastomer
• Repeated disassembly stretching and nicking the part

That duty cycle is exactly what retires this component. None of these stresses is dramatic on its own — the accumulation is what does it. This is why sealing and damping parts are inspection items every time the front frame and sensor cluster is opened up, and why operators who run hard keep spares on the shelf.

A healthy optical window sealing ring delivers:

• Factory-correct fit in the front frame and sensor cluster — no modification, no adaptation
• Exact OEM behavior the surrounding components were engineered around
• Restored function you can verify on the first post-repair check
• Sealing and protection maintained to the factory standard
• One less known-weak point flying through your application window
• Confidence that the repair is done, not patched
• A maintenance log entry with a real DJI part number behind it
• Full compatibility with the parts around it — because it is the part the diagram calls for

Stock the optical window sealing ring before the season does its work, and the front frame and sensor cluster never becomes the reason the aircraft sits.

Before you order, prove the ring is the leak and not the window or the frame land it sits against. Open the front frame, lift the optical window off, and read the compression print the old ring left behind. A ring that was still sealing leaves one continuous, even band of polish or residue all the way around its seat. A ring that has stopped sealing leaves a band that goes faint or disappears for an inch or two, and that faint stretch is where water has been getting in. If the print is even the whole way round and you still have moisture behind the window, the leak is coming from somewhere else and a new ring will not fix it.

Fogging behind the optical window is not automatically a failed ring, and telling the two cases apart saves a teardown. Air that was humid when the cavity was closed will mist the inside of the window on a cold morning and clear as the day warms, and it leaves no residue. A leaking ring leaves evidence you can see: fine dust or dried spray film on the inside face of the window, usually heaviest in a streak that points back toward the gap in the seal, and droplets that reappear specifically after a washdown rather than specifically at dawn. Wipe the inside of the window clean, close it on a dry day, and see which pattern comes back.

Check the ring off the aircraft on a flat bench, because the faults that matter are shape faults. Lay it down and see whether it sits flat with no part of it lifting; roll it between finger and thumb along its whole length feeling for flat spots, nicks, and any section that has gone noticeably thinner than the rest. Squeeze a short length between two fingers and let go, and watch whether it comes back to round or stays dished. Then look at the seat itself in the frame with a light held low, because grit welded into that groove by dried spray mix will hold a brand new ring off its seat exactly the way the old one was.

If the vision or obstacle sensing behind this window is throwing intermittent faults, treat moisture as a suspect before you condemn the sensor. Water bridging inside the optical cavity, or a film of dried chemical on the inside of the window, degrades what the sensor sees without ever showing as a hard failure, so the aircraft flies but the system drops out under conditions you cannot reproduce on the bench. Note whether the faults cluster after washdown days, after heavy dew, or after a hard rain. Faults that track water rather than flight hours point at the seal, not the electronics.

⚙️ Functional Purpose

The optical window sealing ring is designed to do one job in the front frame and sensor cluster and do it to specification: carrying the forward sensors and RTK hardware through vibration and weather.

The component:

• Serves the front frame and sensor cluster of the DJI Agras T100 exactly as the factory intends
• Supports carrying the forward sensors and RTK hardware through vibration and weather
• Maintains the tolerances and interfaces the surrounding parts depend on
• Withstands the chemical, vibration, and washdown environment of agricultural work
• Preserves the sealing and protection strategy of the platform
• Keeps failure modes visible and diagnosable instead of mysterious
• Restores factory behavior immediately upon correct installation
• Protects the more expensive components it works alongside
• Carries the exact DJI specification for its position
• Supports safe, predictable operation under full payload
• Eliminates the guesswork of near-fit substitutes
• Keeps the aircraft inside its designed maintenance program
• Holds up across a full season of professional duty

Function on the T100 is a chain: airframe performance depends on the front frame and sensor cluster, and the front frame and sensor cluster depends on every part in it holding specification. This component is one link in that chain — and chains fail at the worn link, not the average one.

That is why the platform's maintenance philosophy is inspection and renewal, not run-to-failure. The operators with the best uptime records are not the ones with the newest aircraft — they are the ones who replace parts like this when inspection says so, on their own schedule instead of the failure's.

A failing optical window sealing ring costs you:

• Downtime in the middle of an application window — the most expensive hours in agriculture
• Acres not covered while the aircraft waits on a part
• Collateral wear on the components around the failing one
• Diagnostic hours chasing symptoms instead of causes
• Rework when a temporary fix lets go mid-job
• Customer trust when scheduled work slips
• Higher repair bills the longer the fault runs
• Risk exposure every flight the fault remains aboard
• Resale value on an airframe with deferred maintenance

Fix it on your schedule, not the failure's.

Take the window off square and set it down on something soft. Support the optical window as the last fasteners come out so it does not tip on one corner and load its edge against the frame, and put it face down on a clean cloth rather than a bench top, because the outer face is an optical surface and a single scratch across it costs you far more than the ring you are replacing. Never lever the window up with a screwdriver against the frame edge. If it is stuck, it is the old ring holding it, and steady even pressure from underneath or a soft nylon tool worked around the joint will break it loose without marking either part.

Get the seat genuinely clean before the new ring goes anywhere near it. The groove the ring sits in collects dried spray mix, fertilizer dust, and fine grit, and it packs down hard enough that it feels like part of the frame. Work it out with a soft nylon pick and a clean lint-free cloth, not a screwdriver or a wire brush, and finish with a wipe of plain water rather than a solvent or degreaser. Any solvent left in the groove attacks the new elastomer from the moment it is fitted, and a single grain of grit under the ring holds it off its seat and gives you the same leak you just took apart.

Seat the ring the whole way round before any fastener is started, and do not stretch it to get it there. Work it into its groove with your fingers, going around several times and easing slack forward rather than pulling one section tight, then run a fingertip round the whole circumference to confirm it is sitting down evenly with no part standing proud and no part twisted so its seam faces the wrong way. A ring that is stretched into place is thinner where it was pulled, and that thin section is exactly where it will start leaking a few washdowns later.

Bring the window down flat and pull the fasteners up in stages across the pattern, not around it. Start every fastener by hand so the window finds its own position, then take them down in two or three passes moving to the opposite side each time, so the ring compresses evenly instead of being squeezed out on one side and left loose on the other. Stop at the DJI value for that hardware with a driver you trust. Overtightening a window into an elastomer ring does not seal it better; it takes the ring past the compression it was molded for and gives you a permanent set instead of a seal.

⚠️ Common Replacement Indicators

• Hardened, cracked, or glossy sealing surface
• Compression set — the part no longer springs back
• Weeping or residue tracking past the seal line
• Swelling or softening from chemical attack
• Nicks or cuts from previous disassembly
• Flattened, torn, or missing sections
• Moisture found inside the space it protects
• Loss of fit — the part no longer seats snugly
• Perishing or crumbling at the edges
• Discoloration from UV or chemical exposure
• Water in a connector or bay after washdown
• Every teardown — seals are replace-on-open parts

What kills sealing and damping parts: the compounding of ordinary duty. Chemical exposure attacks materials, vibration works at every interface, UV ages every exposed surface, and washdowns drive water at every seam — repeated across hundreds of cycles per season. Add the occasional hard landing or transport knock and the result is predictable: the part that was fine in spring is the failure point by late season.

Replacement and verification: Replacement is a standard shop task on the T100: open access to the front frame and sensor cluster, document connections and hardware positions, swap the optical window sealing ring for the OEM unit, and reassemble with attention to seating, routing, and torque. Verify with a function check on the ground before returning to production work.

Confirm before you order: this is DJI part YC.JG.MY000651. Check the label on your old optical window sealing ring or the position in your official parts diagram and match the number — revision suffixes like .01 or .F on a label are the same part.

Water in the optical cavity that arrives after a pressure wash but never after rain: that is a ring that still seals against standing water and no longer seals against a jet. Pressure-washer spray hits with enough force to deflect an elastomer that has hardened and lost its ability to follow small movements in the joint, and it finds the one stretch of seat where the compression is lightest. Replace the ring, and change how you wash the front of the aircraft, because aiming a narrow jet straight at a sealed optical window is a way to fill it whatever condition the ring is in.

A dried tide mark or a fine grit line on the inside face of the optical window: the water got in, sat, and evaporated, leaving what it carried behind. That deposit tells you two things worth knowing. It confirms the leak is real rather than condensation, and its heaviest end usually points back at the section of ring that let go, which is worth looking at before you throw the old part away. Clean the inside of the window properly with plain water and a soft cloth, because that same film scatters light in front of the sensor even after the leak is fixed.

The optical window no longer pulls down flush, or one edge stands proud with the fasteners tight: the ring has taken a compression set unevenly, or it is trapped and folded under one section of the window rather than sitting in its groove. Do not chase it with more torque. Back the fasteners off, lift the window, and look at where the ring is sitting. A ring pinched under the window edge instead of down in its seat leaks immediately, and it also stops the window seating flat, which puts a bending load into a part that is not meant to carry one.

Greenish or white crusting on a connector, or corrosion creeping along a lead, in the bay behind the front frame: water has been getting past the optical window seal and running downhill to the lowest electrical thing it can find. By the time corrosion is visible on a contact the moisture has been in there for a while, so replacing the ring is necessary but not sufficient. Clean and dry the affected connections, check that the leak stops after the new ring is fitted, and keep an eye on that circuit, because contacts that have corroded once tend to go intermittent later.

📐 Specifications

DJI Material Number: YC.JG.MY000651

Part: Optical Window Sealing Ring

Type: OEM seal / protective consumable

Compatibility:

• DJI Agras T100
• Position: the front frame and sensor cluster
• Diagram sheet: Front Frame (2) (official T100 parts list)

Quantity: 1

Installation Area: The front frame and sensor cluster

Function: Carrying the forward sensors and RTK hardware through vibration and weather

Construction: DJI OEM elastomer/foam component molded to factory dimensions for its exact seat

Application: DJI Agras T100 airframe service and repair

Condition: Brand new

Ring Dimensions and Section Profile: Not published in this listing. Lay the new ring on top of the one you removed before fitting and confirm the inside diameter, the overall thickness, and the cross-section shape all agree, and check the position on the official T100 parts diagram sheet Front Frame (2) if there is any doubt.

Material Hardness and Compound: Not published. It is a molded DJI OEM elastomer supplied for this exact seat. Do not substitute a generic O-ring of similar size from a hardware assortment, because compound and hardness determine how the ring behaves against agricultural chemicals and how much it takes to compress it.

Installation Lubricant: None is supplied and none is required. Fit the ring clean and dry. Petroleum greases and general purpose sprays swell and soften many sealing elastomers, and a ring that has been assembled with the wrong grease can fail in a season even though it was new when it went in.

Fastener Torque at the Optical Window: Not published here. Use the DJI service value for the hardware at this position with a calibrated driver, and pull the fasteners up in stages across the pattern. This joint is sealed by controlled compression of the ring, so both undertightening and overtightening produce a leak.

Reusability: None. This is a replace-on-open part. Once a ring has been compressed in service it has taken a set to that seat, and a ring that is disturbed and refitted rarely returns to the same position or the same compression it had before.

🚜 Necessary For

Built for:

• Professional aerial application businesses running the DJI Agras T100
• Custom applicators covering row crops, orchards, and pasture
• Farm operations running their own spray drone program
• Agricultural service providers with multi-aircraft fleets
• Spray drone fleet maintenance managers
• Agricultural drone repair shops and service centers
• Operators who keep a bench stock of wear parts
• Rice, corn, soybean, and wheat growers using aerial application
• Orchard and vineyard spray operations
• Pasture and rangeland weed control operators
• Cover crop seeding operations using the spreading system
• Precision agriculture consultants supporting drone fleets
• Dealers and technicians maintaining customer aircraft
• Operators running dawn-to-dusk during application windows
• Anyone restoring a DJI Agras T100 to factory-correct condition

Especially valuable during:

• Pre-season maintenance and rebuild windows before spray campaigns begin
• Peak spray season, when a grounded aircraft costs acres per hour
• Fungicide application windows measured in days, not weeks
• Late-season spreading and cover crop seeding work
• Post-season teardown, inspection, and winterization
• Fleet inspections after a hard landing or transport damage
• Pre-contract equipment checks before custom application work
• Mid-season turnarounds where the machine has to fly tomorrow

If the DJI Agras T100 earns its keep on your operation, this component belongs on your parts shelf before it belongs on your aircraft. The time to buy it is before the season, not during the failure.

While the optical window is off, inspect the window itself as carefully as you inspect the ring, because the two fail from the same causes. Look through it against a light for hazing, fine crazing, and the dull cloudiness that comes from repeated washing with solvents or from years of UV. Look at its sealing face for scratches that cross the ring track, because a scratch running across that face is a channel and a new ring will not bridge it. A window that has gone cloudy degrades what the sensor behind it sees long before anyone thinks to blame it.

Check the frame land the ring seals against while you have clear access to it. You are looking for pitting, for corrosion under the finish, for a groove that has been gouged by someone levering a window off in the past, and for any hairline crack running from a fastener hole. The ring can only seal against a surface that is continuous, and damage to the frame side of this joint is the far more expensive half. Fitting a new ring to a scored or cracked land rebuilds the leak and hides it for exactly as long as it takes the next washdown to find it.

Look at the fasteners and their seats before you reuse them. A window that has been leaking has usually been retightened by someone hoping to stop the leak, and overtightened fasteners in composite or light alloy strip the threads, crush the seat, or pull an insert. Check that each fastener draws down and stops cleanly rather than turning on and on, and confirm that any washer is flat. While the bay is open, check the cable routing and any grommet or gland behind the window as well, since water that has been in there has been sitting against those too.

💡 Why This Part Matters

Every acre the T100 covers depends on the front frame and sensor cluster doing its job — and the front frame and sensor cluster depends on parts exactly like this one.

The economics are simple. The DJI Agras T100 exists to cover ground during windows that do not wait — and every hour it sits, the work either doesn't happen or happens on someone else's schedule. A failed optical window sealing ring is rarely expensive because of what the part costs; it is expensive because of when it fails. Parts fail during use, and use happens during the season.

That is the case for OEM and the case for stocking ahead. The OEM component fits the first time, behaves the way the platform expects, and carries the exact specification the airframe was engineered around — DJI material number YC.JG.MY000651. No adaptation, no surprises, no second teardown to undo a near-fit part.

This component delivers:

• Factory-correct fit in the front frame and sensor cluster — no modification, no adaptation
• Exact OEM behavior the surrounding components were engineered around
• Restored function you can verify on the first post-repair check
• Sealing and protection maintained to the factory standard
• One less known-weak point flying through your application window
• Confidence that the repair is done, not patched
• A maintenance log entry with a real DJI part number behind it
• Full compatibility with the parts around it — because it is the part the diagram calls for

Running a compromised optical window sealing ring, operators risk:

• Mid-job failure during an application window
• Collateral damage to surrounding components
• Progressive damage that turns a cheap fix into an expensive one
• Alignment and fit problems spreading to adjacent parts
• Unplanned grounding with the fleet committed to jobs
• Warranty and service complications from improvised fixes
• Higher lifetime cost from deferred maintenance
• An aircraft that cannot be trusted at full payload

Open it up. Renew the seals. Close it dry. Keep the water out.

Ares Acres stocks the optical window sealing ring in the USA with free, fast shipping — so the day you need one is the day it ships, not the week you wait.

This ring dies of chemistry and sunlight far more than of use. It sits at the front of the aircraft where UV hits it directly whenever the window is off or the aircraft is parked with that face to the sun, and it takes the full concentration of whatever is in the tank every time the front of the machine is rinsed down. That combination hardens the surface, and a hardened elastomer cannot follow the small movements in a joint that vibration and thermal cycling produce. Rinsing the front of the aircraft with plain water at the end of a spray day, rather than letting concentrate dry on it, buys real life out of this part.

Store spares flat, sealed, and in the dark, and buy them close to when you need them. Sealing rings age on the shelf as well as on the aircraft, and the things that shorten shelf life are the ones easy to get wrong: sunlight through a shop window, heat next to a compressor or a heater, being hung on a nail or a hook so one part of the ring carries the weight and stretches, and being loose in a drawer where it can pick up grit or get creased under something heavy. Leave it in its bag until the moment it goes on the aircraft.

Replace this one preventively rather than on failure, because the cost of the part is nothing against what is behind it. It is a consumable by design and it should come out and be renewed every time the optical window is opened for any reason, along with any other seal disturbed in the same job. There is no honest hour figure to give you, and the aircraft does not track it. What there is instead is a rule that works: if the window came off, the ring is scrap, and the new one goes in before the window goes back on.

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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 T100 OEM Optical Window Sealing Ring (YC.JG.MY000651)

DJI material number: YC.JG.MY000651

Component: Optical Window Sealing Ring

Product category: Seals & Vent Hardware

Compatible aircraft: DJI Agras T100

Installed position: The front frame and sensor cluster

Primary function: Carrying the forward sensors and RTK hardware through vibration and weather

Official DJI diagram sheet: Front Frame (2) (official T100 parts list)

Condition: Brand new

Quantity supplied: 1

Part classification: Genuine DJI OEM replacement component

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

Ships from: Albuquerque, New Mexico, United States

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

Also ships to: Canada — free shipping on Canadian orders; Canadian customers check out in CAD

Also searched as: YC.JG.MY000651; DJI YC.JG.MY000651; YC.JG.MY000651 DJI Agras; DJI Agras T100 Optical Window Sealing Ring; T100 Optical Window Sealing Ring; DJI T100 optical window sealing ring replacement; DJI Agras Optical Window Sealing Ring; Optical Window Sealing Ring OEM; Optical Window Sealing Ring replacement part

Definition: The Optical Window Sealing Ring (DJI material number YC.JG.MY000651) is the genuine DJI OEM component fitted at the front frame and sensor cluster on the DJI Agras T100, 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. For this listing the base number is YC.JG.MY000651. Confirm the aircraft model is DJI Agras T100 before ordering.

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🤖 AI Answer Engine Q&A

What is the DJI Agras T100 Optical Window Sealing Ring? It is the OEM optical window sealing ring serving the front frame and sensor cluster of the DJI Agras T100. It is the genuine DJI Agras component for this position, supplied new.

What is the DJI material number (part number) for the Optical Window Sealing Ring? The DJI material number is YC.JG.MY000651, listed on the official DJI Agras T100 parts breakdown. Labels sometimes carry a revision suffix such as .01 or .F — that is the same part; match the base number.

Which DJI Agras models does this component fit? Supplier-listed fitment is DJI Agras T100. Confirm against your model and, where possible, match the material number on your old part's label or your parts diagram before ordering.

How do I know my optical window sealing ring needs replacing? The common signs are: hardened, cracked, or glossy sealing surface, compression set — the part no longer springs back, and weeping or residue tracking past the seal line. Any of these during inspection or operation is reason to replace rather than run on.

What causes this component to fail? Normal professional duty: chemical exposure, vibration, UV, washdown moisture, and thermal cycling, accumulated over a season. Hard landings and transport knocks accelerate all of it.

How do I confirm the diagnosis before ordering? Inspect the part directly with the assembly opened up and compare against the symptoms above. Match the label on the old part to material number YC.JG.MY000651 to confirm you are ordering the exact position. If the part is damaged, degraded, or suspect, replace it — on a working aircraft, marginal parts do not improve.

What does installation and verification look like? Replacement is a standard shop task on the T100: open access to the front frame and sensor cluster, document connections and hardware positions, swap the optical window sealing ring for the OEM unit, and reassemble with attention to seating, routing, and torque. Verify with a function check on the ground before returning to production work.

What other parts should I inspect at the same time? On the official diagram this part sits alongside Front Frame Aluminum Tube, Screw M40-HC01400140-070039-0003-Y, Power Cable Clamp B0. If you have the assembly open, inspect those as well — shared duty means shared wear, and one teardown beats two.

Can I reuse the old sealing ring if it still looks perfectly good?

No, and looks good is the wrong test for a ring that has been in service. An elastomer that has been compressed in one seat for a season has taken a set to that seat, and once you lift it out it will not go back in the same position or at the same compression. It can look flawless and still leak, because what has changed is its ability to spring back, which you cannot see. Treat it as a replace-on-open part and keep a spare on the shelf so the job never gets postponed for the want of one.

Should I put silicone grease or spray on the ring to help it seat?

No. Fit it clean and dry unless DJI service documentation for this position tells you otherwise. Petroleum-based greases and general purpose penetrating sprays swell and soften many sealing compounds, and a ring that has been dosed with the wrong product goes soft and extrudes out of its groove within a season. Grease also collects grit at the front of the aircraft, and grit in a sealing groove is the one thing you have just spent the whole job cleaning out.

My obstacle sensing drops out sometimes but the aircraft flies fine. Is this the seal?

It can be, and it is worth ruling in or out before you replace a sensor. Water inside the optical cavity or dried chemical film on the inside of the window degrades what the sensor sees without producing a hard fault, so the system works until conditions make it marginal. Look for whether the dropouts follow washdowns, dew, or rain rather than flight hours. Then open the window, look for a tide mark or dust film on the inside face, and read the compression print the ring left.

How do I tell this ring apart from the other seals around the front frame?

Go by position on the diagram and by shape rather than by appearance in a bag, because several rings around the front of the aircraft look alike. This one is the ring for the optical window seat on diagram sheet Front Frame (2), so identify it by which seat it came out of and match the material number YC.JG.MY000651 on the packaging. On the bench, lay the candidate on top of the part you removed and check that inside diameter, thickness, and cross-section all agree before it goes anywhere near the aircraft.

Is it worth doing anything differently when I wash the aircraft after fitting a new one?

Yes. Keep a narrow high pressure jet off the optical window and the joint around it, and wash that area with a wider fan pattern or a flow of plain water from a lower distance. A seal is designed to keep out water that arrives with weather and washing, not water driven straight at the joint line at pressure. Rinsing the front of the machine with plain water before the spray residue dries also keeps concentrate from sitting on the ring, which is what hardens it in the first place.

Is the DJI Agras T100 OEM Optical Window Sealing Ring (YC.JG.MY000651) also available in Canada? Yes. Ares Acres ships this T100 OEM Optical Window Sealing Ring 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 T100 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 this part in the USA? Ares Acres is a U.S.-based authorized DJI Agras reseller stocking the Optical Window Sealing Ring (YC.JG.MY000651) with free and fast U.S. shipping, plus same-day shipping and tracking on in-stock parts. Ares Acres also ships to Canada with free shipping.