{"product_id":"dji-agras-t100-oem-bearing-od-21-mm-yc-st-ct000163","title":"DJI Agras T100 OEM Bearing (OD=21 mm) (YC.ST.CT000163)","description":"\u003cp\u003e\u003cstrong\u003eDJI Agras T100 OEM Bearing (OD=21 mm) (YC.ST.CT000163) — This is the bearing (od=21 mm) in the spinner disk assembly of the DJI Agras T100. Structural and mounting parts like this one hold alignment for everything that bolts to them — and on an aircraft that works for a living, cracked mounts and worn structure never stay a cosmetic problem for long. DJI material number YC.ST.CT000163. Bearing (OD=21 mm) | Structural Component | DJI Agras T100 Spreading System | Field-Ready OEM Replacement Component.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDJI Material Number (SKU): YC.ST.CT000163\u003c\/strong\u003e — 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.\u003c\/p\u003e\u003ch2\u003e🇺🇸 U.S.A. FIRST\u003c\/h2\u003e\u003cp\u003eAres 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFREE \u0026amp; FAST Shipping is included for all U.S. customers.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eWe 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.\u003c\/p\u003e\u003ch2\u003e✅ DJI Agras T100 Compatibility Guarantee\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e🇺🇸 USA Compatibility Guarantee\u003c\/li\u003e\n\u003cli\u003e👍🏻 Satisfaction Guarantee\u003c\/li\u003e\n\u003cli\u003e💵 Money Back Guarantee\u003c\/li\u003e\n\u003cli\u003e📦 Same Day Shipping \u0026amp; Tracking\u003c\/li\u003e\n\u003cli\u003eDJI material number YC.ST.CT000163 — listed verbatim on the official DJI Agras T100 parts breakdown\u003c\/li\u003e\n\u003cli\u003eSupplier-listed fitment: DJI Agras T100\u003c\/li\u003e\n\u003cli\u003eBrand new condition — never installed, never flown\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003e📦 Package Includes\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e1 × OEM Bearing (OD=21 mm) (YC.ST.CT000163)\u003c\/li\u003e\n\u003cli\u003eOEM protective packaging\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003e🔧 Component Overview\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eDJI Agras T100 OEM Bearing (OD=21 mm)\u003c\/strong\u003e is the OEM bearing (od=21 mm) in the spinner disk assembly of the DJI Agras T100, part of the structure metering and throwing granular material in a controlled swath.\u003c\/p\u003e\u003cp\u003eMetering and throwing granular material in a controlled swath is the job description for the spinner disk assembly, 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 spinner disk assembly is sized, shaped, and specified around that duty. On the official parts diagram it sits alongside Thumb Nut, R-Type Pin, Spinner Disk.\u003c\/p\u003e\u003cp\u003eIgnore a failing bearing (od=21 mm) 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.\u003c\/p\u003e\u003cp\u003eFor professional farmers, aerial applicators, and commercial drone operators, this component is how the spinner disk assembly stays field-ready instead of becoming the reason the aircraft sits.\u003c\/p\u003e\u003cp\u003eThis is a working part on a working aircraft.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThe T100 works brutally hard for its living, including:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMetering and throwing granular material in a controlled swath\u003c\/li\u003e\n\u003cli\u003eDawn-to-dusk spray campaigns during narrow application windows\u003c\/li\u003e\n\u003cli\u003eRepeated fill-fly-return cycles with minutes on the ground between loads\u003c\/li\u003e\n\u003cli\u003eFull-payload takeoffs from field edges, dozens of times per day\u003c\/li\u003e\n\u003cli\u003eChemical exposure from fungicides, herbicides, insecticides, and foliar fertilizers\u003c\/li\u003e\n\u003cli\u003ePressure-washer rinse-downs at the end of every spray day\u003c\/li\u003e\n\u003cli\u003eVibration from eight propulsion motors running at working power\u003c\/li\u003e\n\u003cli\u003eTransport bouncing on trailers and truck beds between fields\u003c\/li\u003e\n\u003cli\u003eTemperature swings from cold morning starts to full-sun afternoons\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhat attacks this component in the field:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eVibration from the propulsion system every flight hour\u003c\/li\u003e\n\u003cli\u003eChemical exposure from spray drift and washdown\u003c\/li\u003e\n\u003cli\u003eUV degradation across a season outdoors\u003c\/li\u003e\n\u003cli\u003eShock loads from field-edge landings\u003c\/li\u003e\n\u003cli\u003eGrit and dust working into interfaces\u003c\/li\u003e\n\u003cli\u003eThermal cycling from dawn starts to afternoon heat\u003c\/li\u003e\n\u003cli\u003eStress concentration at mounting points\u003c\/li\u003e\n\u003cli\u003eWear from repeated maintenance access\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThat 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 structural and mounting parts are inspection items every time the spinner disk assembly is opened up, and why operators who run hard keep spares on the shelf.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eA healthy bearing (od=21 mm) delivers:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFactory-correct fit in the spinner disk assembly — no modification, no adaptation\u003c\/li\u003e\n\u003cli\u003eExact OEM behavior the surrounding components were engineered around\u003c\/li\u003e\n\u003cli\u003eRestored function you can verify on the first post-repair check\u003c\/li\u003e\n\u003cli\u003eSealing and protection maintained to the factory standard\u003c\/li\u003e\n\u003cli\u003eOne less known-weak point flying through your application window\u003c\/li\u003e\n\u003cli\u003eConfidence that the repair is done, not patched\u003c\/li\u003e\n\u003cli\u003eA maintenance log entry with a real DJI part number behind it\u003c\/li\u003e\n\u003cli\u003eFull compatibility with the parts around it — because it is the part the diagram calls for\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eStock the bearing (od=21 mm) before the season does its work, and the spinner disk assembly never becomes the reason the aircraft sits.\u003c\/p\u003e\u003cp\u003eJudge the bearing by hand before you judge it by symptom. With the aircraft powered down and the spreader empty, turn the spinner disk slowly by hand a full revolution and feel what comes back through your fingers. A bearing that is still good turns smoothly, quietly, and with the same resistance the whole way around, and the disk coasts a little when you flick it. A bearing that is finished feels gritty, catches at one or two points in the revolution, rumbles, or stops dead the moment you let go. Do it slowly, because a fast spin masks exactly the roughness you are trying to find.\u003c\/p\u003e\n\u003cp\u003eCheck for play at the rim, where it is easiest to see. Hold the spinner disk at opposite edges and try to rock it against the assembly, then try to lift and push it along its axis. The distance from the bearing out to the rim multiplies any wear inside the bearing, so a small amount of looseness at the bearing shows up as movement you can plainly see at the edge of the disk. A bearing in good order gives you almost nothing. If the rim visibly moves, the disk is not running true at speed either.\u003c\/p\u003e\n\u003cp\u003eUse the other spinner as your reference. The spreading system gives you two of nearly everything, and the second spinner assembly is a free known-good comparison sitting right beside the one you are worried about. Turn both by hand back to back and listen to both. Differences in feel and sound between the two are far more reliable than trying to remember what a good one felt like last season, and if both feel the same you have learned something useful as well.\u003c\/p\u003e\n\u003cp\u003eSeparate a bad bearing from a bent or worn spinner disk by swapping the disks between the two positions. A disk that has been struck, dropped, or has lost material off one vane will wobble and spread unevenly with a perfect bearing behind it. Move each disk to the other side and run the system. If the wobble and the uneven pattern follow the disk, the disk is the fault and a new bearing changes nothing. If the trouble stays at the same position no matter which disk is on it, the bearing, the shaft, or the motor at that position is where to look.\u003c\/p\u003e\n\u003ch2\u003e⚙️ Functional Purpose\u003c\/h2\u003e\u003cp\u003eThe bearing (od=21 mm) is designed to do one job in the spinner disk assembly and do it to specification: metering and throwing granular material in a controlled swath.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThe component:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eServes the spinner disk assembly of the DJI Agras T100 exactly as the factory intends\u003c\/li\u003e\n\u003cli\u003eSupports metering and throwing granular material in a controlled swath\u003c\/li\u003e\n\u003cli\u003eMaintains the tolerances and interfaces the surrounding parts depend on\u003c\/li\u003e\n\u003cli\u003eWithstands the chemical, vibration, and washdown environment of agricultural work\u003c\/li\u003e\n\u003cli\u003ePreserves the sealing and protection strategy of the platform\u003c\/li\u003e\n\u003cli\u003eKeeps failure modes visible and diagnosable instead of mysterious\u003c\/li\u003e\n\u003cli\u003eRestores factory behavior immediately upon correct installation\u003c\/li\u003e\n\u003cli\u003eProtects the more expensive components it works alongside\u003c\/li\u003e\n\u003cli\u003eCarries the exact DJI specification for its position\u003c\/li\u003e\n\u003cli\u003eSupports safe, predictable operation under full payload\u003c\/li\u003e\n\u003cli\u003eEliminates the guesswork of near-fit substitutes\u003c\/li\u003e\n\u003cli\u003eKeeps the aircraft inside its designed maintenance program\u003c\/li\u003e\n\u003cli\u003eHolds up across a full season of professional duty\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFunction on the T100 is a chain: spreading system performance depends on the spinner disk assembly, and the spinner disk assembly 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.\u003c\/p\u003e\u003cp\u003eThat 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eA failing bearing (od=21 mm) costs you:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDowntime in the middle of an application window — the most expensive hours in agriculture\u003c\/li\u003e\n\u003cli\u003eAcres not covered while the aircraft waits on a part\u003c\/li\u003e\n\u003cli\u003eCollateral wear on the components around the failing one\u003c\/li\u003e\n\u003cli\u003eDiagnostic hours chasing symptoms instead of causes\u003c\/li\u003e\n\u003cli\u003eRework when a temporary fix lets go mid-job\u003c\/li\u003e\n\u003cli\u003eCustomer trust when scheduled work slips\u003c\/li\u003e\n\u003cli\u003eHigher repair bills the longer the fault runs\u003c\/li\u003e\n\u003cli\u003eRisk exposure every flight the fault remains aboard\u003c\/li\u003e\n\u003cli\u003eResale value on an airframe with deferred maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFix it on your schedule, not the failure's.\u003c\/p\u003e\u003cp\u003eTake the spinner assembly apart in the order the design intends. The disk is retained by a thumb nut and an R-type pin so it comes off without tools for cleaning, and that is how it should come off for this job as well. Do not hammer a stuck disk and do not lever against the face of it with a screwdriver. The disk is a balanced rotating part with thin sections, and a disk that has been pried on will wobble afterward, which produces the same complaint you are trying to fix.\u003c\/p\u003e\n\u003cp\u003eClean the whole area down before you open anything. Granular fertilizer packs into every corner of a spinner assembly and it is both abrasive and corrosive, so anything that falls loose while you are working ends up in the bearing seat. Brush and rinse the disk, the hub, and the surrounding housing, then dry it. Working dry and clean also lets you see the corrosion, the wear track on the shaft, and the staining that tells you how long the bearing has been unhappy.\u003c\/p\u003e\n\u003cp\u003ePress a bearing by the race that is an interference fit, never through the balls. If the bearing is tight on the shaft, push on the inner race. If it is tight in a housing, push on the outer race. Driving a bearing home by pushing on the wrong race sends the whole fitting load through the rolling elements and dents the raceways, and a bearing damaged that way is rough and noisy from the first minute even though it is brand new. Use a socket or a drift that contacts the correct race squarely, and never strike the bearing directly with a steel hammer.\u003c\/p\u003e\n\u003cp\u003eInspect and prepare the seats before the new bearing goes anywhere near them. Look at the shaft or hub for a polished band, scoring, or a shiny ring that says the old bearing had started to turn on its seat instead of turning inside itself. Check the housing bore for the same. A bearing fitted into a seat that has already been worn will move again, and the second failure comes much faster than the first. Wipe both seats clean and dry, and do not open the bearing packaging until the seats are ready.\u003c\/p\u003e\n\u003cp\u003eCheck it turns freely and then check it under power. With the bearing fitted and the disk back on the thumb nut and R-pin, turn it by hand again and confirm it is smooth and free of the play you found before. Then run the spinner with an empty hopper and listen for a rumble or a whine that tracks spinner speed, and watch the disk edge for wobble. Only after that is clean is it worth putting product through it and looking at the pattern on the ground.\u003c\/p\u003e\n\u003ch2\u003e⚠️ Common Replacement Indicators\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eVisible cracking, deformation, or impact damage\u003c\/li\u003e\n\u003cli\u003eStress-whitening at load points\u003c\/li\u003e\n\u003cli\u003eLoose fit where the part should seat firmly\u003c\/li\u003e\n\u003cli\u003eMovement or rattle the design does not allow\u003c\/li\u003e\n\u003cli\u003eWear marks from parts contacting where they should not\u003c\/li\u003e\n\u003cli\u003eFastener holes elongated or damaged\u003c\/li\u003e\n\u003cli\u003eChemical or UV degradation of the material\u003c\/li\u003e\n\u003cli\u003eDamage found during teardown of the assembly\u003c\/li\u003e\n\u003cli\u003eMisalignment of the components this part positions\u003c\/li\u003e\n\u003cli\u003eNoise or vibration traced to this position\u003c\/li\u003e\n\u003cli\u003eDamage after a hard landing or transport strike\u003c\/li\u003e\n\u003cli\u003ePrevious field repair with tape, glue, or improvisation\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhat kills structural and mounting 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.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eReplacement and verification:\u003c\/strong\u003e Replacement is a standard shop task on the T100: open access to the spinner disk assembly, document connections and hardware positions, swap the bearing (od=21 mm) 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eConfirm before you order:\u003c\/strong\u003e this is DJI part YC.ST.CT000163. Check the label on your old bearing (od=21 mm) 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.\u003c\/p\u003e\u003cp\u003eA spread pattern that is heavier on one side than the other, or that has developed streaks in the field where the swath used to be even, means one spinner is no longer throwing the way its partner does. A bearing that has gone rough or loose changes disk speed and lets the disk run out of plane, and both of those change where the material lands. Because the aircraft has two spinners, the symptom shows up as an asymmetric pattern rather than as an overall rate change, which is the clue that points here rather than at the auger.\u003c\/p\u003e\n\u003cp\u003eA rumble, growl, or whine from the spreader that rises and falls with spinner speed rather than with auger speed or motor load is a bearing telling you it has lost its surface finish inside. Run the system empty and stand where you can separate the two spinners by ear. Noise that is clearly coming from one side, and that is absent on the other, is about as clear a diagnosis as this assembly gives you.\u003c\/p\u003e\n\u003cp\u003eA spinner motor that runs hot or draws more current than its partner on the same job has something adding drag on that side. Before suspecting the motor, turn the disk by hand and feel for the roughness, because a dragging bearing loads a motor continuously and will eventually damage a perfectly good one. If both spinner motors are the same temperature after a run and only one sounds wrong, you are still looking at the bearing rather than the drive.\u003c\/p\u003e\n\u003cp\u003eRust staining, a reddish or brown weep track, or a crust of dried fertilizer worked in tight around the bearing at the hub says water and product have been getting where they should not. Granular fertilizer is hygroscopic, so residue left on the assembly pulls moisture out of the air and holds it against the bearing overnight. Staining that returns after every wash is a warning that the bearing is being attacked between jobs, not during them.\u003c\/p\u003e\n\u003cp\u003eVisible wobble at the edge of the disk while the spinner is running, on an assembly that used to run flat, is the late-stage version of the play you can feel by hand. By the time it is visible at working speed the bearing is passing load into the shaft and the motor, and the vanes on the disk may already be contacting something they should clear. Stop and inspect rather than finishing the load, because the parts downstream of a wobbling disk cost far more than the bearing does.\u003c\/p\u003e\n\u003ch2\u003e📐 Specifications\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eDJI Material Number:\u003c\/strong\u003e YC.ST.CT000163\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePart:\u003c\/strong\u003e Bearing (OD=21 mm)\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eType:\u003c\/strong\u003e OEM structural \/ mounting component\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDJI Agras T100\u003c\/li\u003e\n\u003cli\u003ePosition: the spinner disk assembly\u003c\/li\u003e\n\u003cli\u003eDiagram sheet: Spinner Disk Assembly (official T100 parts list)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstallation Area:\u003c\/strong\u003e The spinner disk assembly\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFunction:\u003c\/strong\u003e Metering and throwing granular material in a controlled swath\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eStated in DJI name:\u003c\/strong\u003e OD=21 mm\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eConstruction:\u003c\/strong\u003e DJI OEM molded or machined component manufactured to factory dimensions\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e DJI Agras T100 spreading system service and repair\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Brand new\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eOutside Diameter:\u003c\/strong\u003e The part name gives an outside diameter of 21 mm, and that is the figure to check first against the bearing you removed. Measure the outer face of the old bearing across its diameter with calipers. If it does not come out at 21 mm, you are looking at a different part and a different number.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBore and Width:\u003c\/strong\u003e Not published by the supplier for YC.ST.CT000163. Outside diameter alone does not identify a bearing, so compare the bore and the width of the replacement against the part you removed before fitting. A bearing with the correct outside diameter and the wrong bore will drop into the housing and do nothing useful.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBearing Type, Seals, and Lubrication:\u003c\/strong\u003e The supplier does not publish the internal construction, the seal or shield arrangement, or a lubricant specification for this part. Do not wash a new bearing out in solvent, because that removes lubrication that may not be replaceable, and do not assume it can be regreased. Compare the replacement with the old part and fit it as it comes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReplacement Interval:\u003c\/strong\u003e DJI does not publish an hour-based interval for this bearing. Treat it as a wear item checked by hand whenever the spinner disk comes off for cleaning, which on a spreading aircraft is often. Judge it on feel, noise, and rim play rather than on a calendar.\u003c\/p\u003e\n\u003ch2\u003e🚜 Necessary For\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eBuilt for:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProfessional aerial application businesses running the DJI Agras T100\u003c\/li\u003e\n\u003cli\u003eCustom applicators covering row crops, orchards, and pasture\u003c\/li\u003e\n\u003cli\u003eFarm operations running their own spray drone program\u003c\/li\u003e\n\u003cli\u003eAgricultural service providers with multi-aircraft fleets\u003c\/li\u003e\n\u003cli\u003eSpray drone fleet maintenance managers\u003c\/li\u003e\n\u003cli\u003eAgricultural drone repair shops and service centers\u003c\/li\u003e\n\u003cli\u003eOperators who keep a bench stock of wear parts\u003c\/li\u003e\n\u003cli\u003eRice, corn, soybean, and wheat growers using aerial application\u003c\/li\u003e\n\u003cli\u003eOrchard and vineyard spray operations\u003c\/li\u003e\n\u003cli\u003ePasture and rangeland weed control operators\u003c\/li\u003e\n\u003cli\u003eCover crop seeding operations using the spreading system\u003c\/li\u003e\n\u003cli\u003ePrecision agriculture consultants supporting drone fleets\u003c\/li\u003e\n\u003cli\u003eDealers and technicians maintaining customer aircraft\u003c\/li\u003e\n\u003cli\u003eOperators running dawn-to-dusk during application windows\u003c\/li\u003e\n\u003cli\u003eAnyone restoring a DJI Agras T100 to factory-correct condition\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eEspecially valuable during:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePre-season maintenance and rebuild windows before spray campaigns begin\u003c\/li\u003e\n\u003cli\u003ePeak spray season, when a grounded aircraft costs acres per hour\u003c\/li\u003e\n\u003cli\u003eFungicide application windows measured in days, not weeks\u003c\/li\u003e\n\u003cli\u003eLate-season spreading and cover crop seeding work\u003c\/li\u003e\n\u003cli\u003ePost-season teardown, inspection, and winterization\u003c\/li\u003e\n\u003cli\u003eFleet inspections after a hard landing or transport damage\u003c\/li\u003e\n\u003cli\u003ePre-contract equipment checks before custom application work\u003c\/li\u003e\n\u003cli\u003eMid-season turnarounds where the machine has to fly tomorrow\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIf 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.\u003c\/p\u003e\u003cp\u003eThe part most often confused with this one is the sliding bearing used in the auger and boom assembly. They are both listed as bearings and both live in the spreading system, but they are different components at different positions with different numbers. A sliding bearing is a plain sleeve with a single continuous bore and no rolling elements, and it will not coast if you spin it. This part is identified by its 21 mm outside diameter and by the Spinner Disk Assembly sheet, alongside the thumb nut, the R-type pin, and the spinner disk itself.\u003c\/p\u003e\n\u003cp\u003eIt also gets confused with the plain spacers and washers that sit under the thumb nut in the same stack. When a spinner is stripped for cleaning, everything comes off the shaft together and it is easy to remember the stack wrong. A spacer has no running surface, shows no wear track inside its bore, and does not carry a load path between a rotating and a stationary part. If the item you took out shows no polished band where something was turning against it, check the diagram before you order.\u003c\/p\u003e\n\u003cp\u003eBearings of similar appearance and different size appear throughout the aircraft, and outside diameter is what separates them at a glance. Measure the one you removed rather than eyeballing it, and if you keep a bench stock of bearings from other jobs, do not fit one because it looks right. A bearing that is close but not correct will feel fine when you assemble it and will fail early, in the most abrasive position on the aircraft, usually in the middle of a spreading window.\u003c\/p\u003e\n\u003ch2\u003e💡 Why This Part Matters\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eEvery acre the T100 covers depends on the spinner disk assembly doing its job — and the spinner disk assembly depends on parts exactly like this one.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe 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 bearing (od=21 mm) 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.\u003c\/p\u003e\u003cp\u003eThat 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 spreading system was engineered around — DJI material number YC.ST.CT000163. No adaptation, no surprises, no second teardown to undo a near-fit part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThis component delivers:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFactory-correct fit in the spinner disk assembly — no modification, no adaptation\u003c\/li\u003e\n\u003cli\u003eExact OEM behavior the surrounding components were engineered around\u003c\/li\u003e\n\u003cli\u003eRestored function you can verify on the first post-repair check\u003c\/li\u003e\n\u003cli\u003eSealing and protection maintained to the factory standard\u003c\/li\u003e\n\u003cli\u003eOne less known-weak point flying through your application window\u003c\/li\u003e\n\u003cli\u003eConfidence that the repair is done, not patched\u003c\/li\u003e\n\u003cli\u003eA maintenance log entry with a real DJI part number behind it\u003c\/li\u003e\n\u003cli\u003eFull compatibility with the parts around it — because it is the part the diagram calls for\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eRunning a compromised bearing (od=21 mm), operators risk:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMid-job failure during an application window\u003c\/li\u003e\n\u003cli\u003eCollateral damage to surrounding components\u003c\/li\u003e\n\u003cli\u003eProgressive damage that turns a cheap fix into an expensive one\u003c\/li\u003e\n\u003cli\u003eAlignment and fit problems spreading to adjacent parts\u003c\/li\u003e\n\u003cli\u003eUnplanned grounding with the fleet committed to jobs\u003c\/li\u003e\n\u003cli\u003eWarranty and service complications from improvised fixes\u003c\/li\u003e\n\u003cli\u003eHigher lifetime cost from deferred maintenance\u003c\/li\u003e\n\u003cli\u003eAn aircraft that cannot be trusted at full payload\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eInspect it honestly. Replace it once. Fit it right. Keep it flying.\u003c\/p\u003e\u003cp\u003eAres Acres stocks the bearing (od=21 mm) in the USA with free, fast shipping — so the day you need one is the day it ships, not the week you wait.\u003c\/p\u003e\n\u003cp\u003eWhile the disk is off, look at everything in that stack. Check the spinner disk for cracks radiating out from the hub and for vanes that have worn thin or lost their edge, because worn vanes throw a different pattern and will keep you chasing a spread problem after the bearing is new. Check the thumb nut thread for damage and the R-type pin for spring tension, since a pin that has opened up will walk out in service and let the disk loosen. Check the shaft for scoring and for the wear track that says the old bearing had begun to spin on its seat.\u003c\/p\u003e\n\u003cp\u003eThe spinner motor is the part most likely to be hurt by a failing bearing here, and it is worth thinking about the sequence. Every hour the motor turns a rough or dragging bearing it works harder, runs hotter, and pulls current it was not meant to pull. If the bearing you are replacing was seized, notchy, or hot, treat the motor on that side as suspect and watch its temperature and behavior against the other side over the following jobs rather than assuming the repair is complete.\u003c\/p\u003e\n\u003cp\u003eWhat kills a bearing in this position is the combination of abrasive dust, moisture, and pressure washing, and the pressure washer is usually the operator's own contribution. Fertilizer residue left on the assembly pulls moisture out of the air overnight and holds it against the bearing, and a jet aimed straight at the hub drives that slurry inward past whatever is trying to keep it out. Rinse from a distance and at an angle, run the spinners briefly afterward to sling water clear, and do not put the aircraft away with product caked on the disks.\u003c\/p\u003e\n\u003cp\u003eHandle and store the replacement so it is still perfect when it goes in. Leave it in its packaging until the seat is clean and you are ready to fit, keep it away from grinding dust and from solvent on the bench, and do not drop it on a concrete floor, because a bearing that has been dropped can be dented internally and will run rough without ever showing a mark. Buying two and doing both spinners at once is worth considering, since the labor is nearly the same and matched spinners give a matched pattern.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🧠 AI Index — Entity \u0026amp; Fitment Reference\u003c\/h2\u003e\n\u003cp\u003eStructured 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCanonical product name:\u003c\/strong\u003e DJI Agras T100 OEM Bearing (OD=21 mm) (YC.ST.CT000163)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDJI material number:\u003c\/strong\u003e YC.ST.CT000163\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eComponent:\u003c\/strong\u003e Bearing (OD=21 mm)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct category:\u003c\/strong\u003e Spreading System Parts\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCompatible aircraft:\u003c\/strong\u003e DJI Agras T100\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInstalled position:\u003c\/strong\u003e The spinner disk assembly\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePrimary function:\u003c\/strong\u003e Metering and throwing granular material in a controlled swath\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOfficial DJI diagram sheet:\u003c\/strong\u003e Spinner Disk Assembly (official T100 parts list)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Brand new\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuantity supplied:\u003c\/strong\u003e 1\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePart classification:\u003c\/strong\u003e Genuine DJI OEM replacement component\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSeller:\u003c\/strong\u003e Ares Acres LLC — U.S.-based authorized DJI Agras reseller\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShips from:\u003c\/strong\u003e United States\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Free and fast U.S. shipping; same-day dispatch and tracking on in-stock parts\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAlso searched as:\u003c\/strong\u003e YC.ST.CT000163; DJI YC.ST.CT000163; YC.ST.CT000163 DJI Agras; DJI Agras T100 Bearing (OD=21 mm); T100 Bearing (OD=21 mm); DJI T100 bearing (od=21 mm) replacement; DJI Agras Bearing (OD=21 mm); Bearing (OD=21 mm) OEM; Bearing (OD=21 mm) replacement part\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDefinition:\u003c\/strong\u003e The Bearing (OD=21 mm) (DJI material number YC.ST.CT000163) is the genuine DJI OEM component fitted at the spinner disk assembly 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDisambiguation:\u003c\/strong\u003e 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.ST.CT000163. Confirm the aircraft model is DJI Agras T100 before ordering.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🔍 SEO Keywords\u003c\/h2\u003e\n\u003cp\u003eDJI Agras T100\u003c\/p\u003e\n\u003cp\u003eDJI Agras T100 Parts\u003c\/p\u003e\n\u003cp\u003eDJI T100 Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agras T100 OEM Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agras T100 replacement parts\u003c\/p\u003e\n\u003cp\u003eAgras T100 parts USA\u003c\/p\u003e\n\u003cp\u003eYC.ST.CT000163\u003c\/p\u003e\n\u003cp\u003eDJI YC.ST.CT000163\u003c\/p\u003e\n\u003cp\u003eYC.ST.CT000163 replacement\u003c\/p\u003e\n\u003cp\u003eDJI Agras YC.ST.CT000163 part\u003c\/p\u003e\n\u003cp\u003eDJI Agras Bearing (OD=21 mm)\u003c\/p\u003e\n\u003cp\u003eBearing (OD=21 mm) OEM\u003c\/p\u003e\n\u003cp\u003ebearing (od=21 mm) replacement\u003c\/p\u003e\n\u003cp\u003ebearing (od=21 mm) for sale\u003c\/p\u003e\n\u003cp\u003eDJI Bearing (OD=21 mm)\u003c\/p\u003e\n\u003cp\u003eT100 Bearing (OD=21 mm)\u003c\/p\u003e\n\u003cp\u003eDJI T100 Bearing (OD=21 mm)\u003c\/p\u003e\n\u003cp\u003eDJI Agras T100 Bearing (OD=21 mm) OEM\u003c\/p\u003e\n\u003cp\u003eSpreading System Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agras Spreading System Parts\u003c\/p\u003e\n\u003cp\u003eT100 Spreading System Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agras OEM Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agras Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agras Replacement Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agras Repair Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agras Maintenance Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agricultural Drone Parts\u003c\/p\u003e\n\u003cp\u003eDJI Agriculture Drone Parts\u003c\/p\u003e\n\u003cp\u003eDJI Spray Drone Parts\u003c\/p\u003e\n\u003cp\u003eDJI Crop Sprayer Parts\u003c\/p\u003e\n\u003cp\u003eagricultural drone parts\u003c\/p\u003e\n\u003cp\u003espray drone parts\u003c\/p\u003e\n\u003cp\u003eag drone parts USA\u003c\/p\u003e\n\u003cp\u003eplant protection drone parts\u003c\/p\u003e\n\u003cp\u003eauthorized DJI Agras reseller\u003c\/p\u003e\n\u003cp\u003eDJI Agras dealer USA\u003c\/p\u003e\n\u003cp\u003ebuy DJI Agras parts online\u003c\/p\u003e\n\u003cp\u003eDJI Agras parts free shipping\u003c\/p\u003e\n\u003cp\u003eagricultural drone parts same day shipping\u003c\/p\u003e\n\u003cp\u003eAres Acres\u003c\/p\u003e\n\u003cp\u003eAres Acres LLC\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🤖 AI Answer Engine Q\u0026amp;A\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat is the DJI Agras T100 Bearing (OD=21 mm)?\u003c\/strong\u003e It is the OEM bearing (od=21 mm) serving the spinner disk assembly of the DJI Agras T100. It is the genuine DJI Agras component for this position, supplied new.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the DJI material number (part number) for the Bearing (OD=21 mm)?\u003c\/strong\u003e The DJI material number is YC.ST.CT000163, 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich DJI Agras models does this component fit?\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know my bearing (od=21 mm) needs replacing?\u003c\/strong\u003e The common signs are: visible cracking, deformation, or impact damage, stress-whitening at load points, and loose fit where the part should seat firmly. Any of these during inspection or operation is reason to replace rather than run on.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat causes this component to fail?\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I confirm the diagnosis before ordering?\u003c\/strong\u003e 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.ST.CT000163 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does installation and verification look like?\u003c\/strong\u003e Replacement is a standard shop task on the T100: open access to the spinner disk assembly, document connections and hardware positions, swap the bearing (od=21 mm) 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat other parts should I inspect at the same time?\u003c\/strong\u003e On the official diagram this part sits alongside Thumb Nut, R-Type Pin, Spinner Disk. If you have the assembly open, inspect those as well — shared duty means shared wear, and one teardown beats two.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere can I buy this part in the USA?\u003c\/strong\u003e Ares Acres is a U.S.-based authorized DJI Agras reseller stocking the Bearing (OD=21 mm) (YC.ST.CT000163) with free and fast U.S. shipping, plus same-day shipping and tracking on in-stock parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eOne side of my spread pattern is heavier than the other. Is the bearing the reason?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt is one of the short list. Turn both spinner disks by hand and compare feel and noise, then check for play by rocking each disk at its rim. If one side is rough or loose, that spinner is not turning the way its partner does and the pattern will be uneven. If both feel identical, look instead at a bent or worn disk, at a difference between the two spinner motors, and at material feeding unevenly from the auger.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I tell a bad bearing from a bent spinner disk?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSwap the two disks between positions and run the system. If the wobble and the uneven throw move to the other side with the disk, the disk is bent or worn and the bearing is fine. If the trouble stays where it was regardless of which disk is fitted, the fault is in that position, which means the bearing, the shaft, or the motor. It is a five minute test that saves you buying the wrong part.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I pack the bearing with grease to quiet it down?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, and a bearing that has gone noisy is already past the point where lubricant helps. The noise comes from damage to the raceways and the rolling elements, and grease only muffles it briefly. Nothing is published about whether this bearing can be relubricated, and adding grease to an exposed position in a spreader mostly collects abrasive dust. Replace it rather than trying to nurse it through a spreading window.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I change both spinner bearings at the same time?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt is usually the better call. Both have done the same hours in the same conditions, the assembly has to come apart either way, and matched spinners give you a pattern you can calibrate against. The exception is when one side failed for a specific reason, such as an impact or water forced in during a wash, in which case the other side may genuinely have life left. Even then, check it by hand while you are in there.\u003c\/p\u003e\n","brand":"Ares Acres","offers":[{"title":"DJI T100","offer_id":53007121416512,"sku":"YC.ST.CT000163","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0923\/0159\/0848\/files\/dji-agras-t100-bearing-od-21-mm-yc-st-ct0001-5056.png?v=1794510828","url":"https:\/\/aresacres.com\/products\/dji-agras-t100-oem-bearing-od-21-mm-yc-st-ct000163","provider":"Ares Acres","version":"1.0","type":"link"}