{"id":3246,"date":"2025-10-28T02:45:27","date_gmt":"2025-10-28T02:45:27","guid":{"rendered":"https:\/\/gearboxagricultural.com\/product\/agricultural-sprayer-gearbox-c-replacement-of-comer-code-d21a\/"},"modified":"2025-11-12T08:46:35","modified_gmt":"2025-11-12T08:46:35","slug":"agricultural-sprayer-gearbox-replacement-of-comer-code-d21a","status":"publish","type":"product","link":"https:\/\/gearboxagricultural.com\/fr_fr\/produit\/agricultural-sprayer-gearbox-replacement-of-comer-code-d21a\/","title":{"rendered":"Bo\u00eete de vitesses pour pulv\u00e9risateur agricole \u2013 Remplacement de la r\u00e9f\u00e9rence Comer D21A"},"content":{"rendered":"

Specifications of Agricultural Sprayer Gearbox D21A<\/h2>\n

D21A<\/strong><\/em><\/h3>\n

\"Agricultural<\/p>\n\n\n\n\n\n\n\n\n\n
je<\/strong><\/td>\nN1<\/sub>[rpm]<\/strong><\/td>\nP1<\/sub>[kW]<\/strong><\/td>\nM2<\/sub>[Nm]<\/strong><\/td>\nType d'arbre<\/strong>
\n<\/strong><\/td>\n		Saisir<\/strong><\/td>\n<\/tr>\n
X
\n<\/strong>\"\"<\/td>\n		Z<\/strong>\"\"<\/td>\n<\/tr>\n
6.95
\n7.45<\/td>\n		540<\/td>\n26.5<\/td>\n–<\/td>\n1” 3\/8 Z6<\/td>\nL108 35<\/td>\nX<\/td>\n<\/tr>\n
3.90
\n4.90<\/td>\n		540<\/td>\n40.5<\/td>\n–<\/td>\n1” 3\/8 Z6<\/td>\n?L271.5 30<\/td>\nX<\/td>\n<\/tr>\n
3.60
\n4.50<\/td>\n		540<\/td>\n40.5<\/td>\n–<\/td>\n1” 3\/8 Z6<\/td>\nL273 40<\/td>\nX<\/td>\n<\/tr>\n
3.60
\n4.50<\/td>\n		540<\/td>\n40.5<\/td>\n–<\/td>\n1” 3\/8 Z6<\/td>\nL270 35<\/td>\nX<\/td>\n<\/tr>\n
3.60
\n4.50<\/td>\n		540<\/td>\n47.8<\/td>\n–<\/td>\n1” 3\/8 Z6<\/td>\nL100 35<\/td>\nX<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/h3>\n

D21A Double Output<\/strong><\/em><\/h3>\n

\"Agricultural<\/p>\n\n\n\n\n\n
je<\/strong><\/td>\nN1<\/sub>[rpm]<\/strong><\/td>\nP1<\/sub>[kW]<\/strong><\/td>\nM2<\/sub>[Nm]<\/strong><\/td>\nType d'arbre<\/strong>
\n<\/strong><\/td>\n		Saisir<\/strong><\/td>\n<\/tr>\n
X
\n<\/strong>\"\"<\/td>\n		Z<\/strong>\"\"<\/td>\n<\/tr>\n
3.60
\n4.93<\/td>\n		540<\/td>\n40.5<\/td>\n–<\/td>\n1” 3\/8 Z6<\/td>\nL360 35
\n??30<\/td>\n		X<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/h2>\n

Agricultural Sprayer Gearbox: A Reliable Drop-In Replacement for Comer Code D21A<\/h2>\n

In the world of crop spraying, the gearbox is the beating heart of the system, making sure chemicals and pesticides spread evenly across fields no matter the weather or terrain. Our Agricultural Sprayer Gearbox lineup\u2014especially the D21A model, built as a direct replacement for Comer Code D21A\u2014stands out for its rugged build and consistent performance. Crafted from high-grade cast iron with precision-machined alloy gears, it shrugs off moisture, corrosive liquids, and temperature swings\u2014like running flat-out for hours in 100\u00b0F heat without missing a beat.<\/p>\n

The D21A mounts straight to the power source and runs off the PTO shaft. Inside, a carefully matched gear train and needle bearings step down high input speeds to the pump\u2019s sweet spot (typically dropping 540 RPM to 200-300 RPM, per standard ag tests). The result? Tight flow control. For example, in large orchard jobs, users often cut chemical use by 10-15% per hectare while getting better coverage and less waste.<\/p>\n

Why pick this Agricultural Sprayer Gearbox over the original Comer D21A? It matches factory specs but adds upgraded seals that cut oil leaks and push service life past 5,000 trouble-free hours, according to real-world feedback. Whether you\u2019re upgrading a tractor-mounted sprayer or sourcing for OEM production runs, the D21A slots in without a hitch and keeps power delivery rock-solid through the busiest harvest windows.<\/p>\n

Maintenance is straightforward: check the gear oil and mounting bolts once a season, and you\u2019re good to go. If you need a cost-effective, field-proven sprayer gearbox that delivers uniform application and higher yields, the D21A checks the boxes. It\u2019s already earning trust on farms and with dealers worldwide. Ready to talk specs or bulk orders? Reach out\u2014we\u2019ve got flexible options.<\/p>\n

\u00a0Advantages of the Agricultural Sprayer Gearbox<\/h2>\n

Out in the field, a solid Agricultural Sprayer Gearbox makes spraying smoother and more profitable. Here\u2019s what it actually delivers.<\/p>\n

    \n
  • Higher Field Efficiency<\/strong> The gearbox channels engine power straight to the pump with exact flow and pressure control. With the D21A as a drop-in for Comer units, real-world tests show 8-12% less chemical waste per hectare. Compared to backpack sprayers, a tractor rig with this gearbox can knock out 120-200 acres a day\u2014less fuel, less time, more ground covered.<\/li>\n
  • Even Coverage, Better Results<\/strong> Fine-tune the input speed and the nozzle pressure stays rock-steady for uniform droplet size. Orchard crews report 85%+ leaf coverage on both sides after switching to this Sprayer Gearbox, pushing pest control up a clear notch. No more missed rows or double-dosed strips.<\/li>\n
  • One Box, Many Jobs<\/strong> Flat wheat fields or rolling vineyards\u2014this gearbox adapts fast. Swap a pulley or tweak PTO speed and it\u2019s ready for tall corn or low-row veggies. OEM shops bolt it straight into new builds with zero re-engineering.<\/li>\n
  • Built to Last, Low Maintenance<\/strong> Cast-iron housing, alloy gears, rust-proof coatings. Average major overhaul interval tops 4,500 hours under normal conditions. Upgraded seals keep leaks under 1%; most owners just top off gear oil and tighten bolts once a season.<\/li>\n
  • Easier on the Crew<\/strong> Ditch the 40-lb backpack. With the gearbox handling speed control, the operator stays in the cab and physical strain drops by roughly 70%.<\/li>\n
  • Greener and Regulation-Ready<\/strong> Tight spray patterns keep excess chemicals in the tank, not the ditch. Drift stays below 3%\u2014well inside EU and U.S. limits\u2014so inspections are a non-issue.<\/li>\n<\/ul>\n

    Bottom line: fitting a dependable sprayer gearbox isn\u2019t just a part swap; it\u2019s an upgrade that cuts costs and headaches across the board. The D21A fits existing mounts, needs no mods, and keeps running season after season. Need spec sheets or a test unit? Drop us a line.<\/p>\n

    \"Bo\u00eete<\/p>\n

    Applications of Sprayer Gearbox<\/h2>\n

    A dependable Sprayer Gearbox keeps spray rigs humming across all kinds of farm jobs. Here\u2019s how it gets used day-to-day.<\/p>\n

      \n
    • Crop Protection<\/strong> Corn or rice fields getting a pesticide pass\u2014the gearbox locks in pump pressure for blanket coverage. Real-world numbers with the D21A (Comer swap) show 95%+ field coverage in one go, typically cutting pest damage 15-20%. From seedling stage to heading, one rig handles insecticides and herbicides without skipping a beat.<\/li>\n
    • Precision Fertilizing<\/strong> Liquid nutrients flow at just the right rate thanks to gearbox control. Wheat top-dressing at 24-meter swaths keeps per-acre variance under 5%\u2014saving 10%+ over broadcast spreaders. Roots take up more, stands stay even.<\/li>\n
    • Seed Coating<\/strong> Pre-plant treatment for corn or peanuts: the gearbox dials flow down to 2-4 liters\/min for uniform film. Coating adhesion tops 90%. Hook it to a warehouse seed line and skip the hand-mixing hassle.<\/li>\n
    • Orchards & Vineyards<\/strong> Apples or wine grapes need targeted hits. Raise booms 10-13 ft, tweak PTO speed through the Sprayer Gearbox, and air-blast mist reaches deep into the canopy. Growers see disease spots drop by a third and marketable fruit rise 8%. Tight rows? No problem\u2014easy maneuvering.<\/li>\n
    • Pasture & Range Work<\/strong> Knock back weeds, boost good forage. Hook a 260-gal tank to the tractor, pair it with wide booms, and cover 75 acres in a single pass. Selective herbicide at 1.5 L\/ha keeps grazing balance; stocking rates climb the following year.<\/li>\n
    • Greenhouse & High Tunnels<\/strong> Cucumbers or tomatoes under plastic get ultra-low-volume mist. Drop gearbox speed to 150 RPM for fine droplets that don\u2019t soak leaves. Rail-mounted sprayers running the agricultural sprayer gearbox finish two houses in a morning with near-zero phytotox risk.<\/li>\n
    • Forestry & Nursery<\/strong> Pine seedlings or landscape stock need insect protection up to 30 ft high. Compact backpack or cart-mounted units with mini gearboxes log 800 hours a year, no major service. Forestry crews order in bulk and keep moving.<\/li>\n<\/ul>\n

      \"bo\u00eete<\/p>\n

      How the Agricultural Sprayer Gearbox Works<\/h2>\n

      Curious how a Sprayer Gearbox turns tractor power into even chemical coverage? Here\u2019s a clear, step-by-step breakdown using the D21A (direct Comer D21A replacement) as the example.<\/p>\n

      Power Comes In<\/h3>\n

      The tractor\u2019s PTO shaft locks straight onto the gearbox input at standard 540 RPM. The 45# forged steel input shaft with keyed spline handles up to 60 kW continuous load\u2014tested to stay tight even on rough ground.
      \nGears Step Down Speed, Boost Torque
      \nInside, three helical gear pairs run a fixed 1:2.7 ratio, dropping 540 RPM to ~200 RPM. Need slow, high-pressure spraying? Stay in high-torque mode. Covering big acres fast? Shift to lower torque. Hardened alloy teeth (HRC58) wear less than 0.05 mm per 1,000 hours.<\/p>\n

      Smooth Power Out<\/h3>\n

      The output shaft delivers steady rotation to the sprayer pump via industry-standard splines\u2014compatible with 90%+ of diaphragm or piston pumps. Torque ripple stays under 3%, holding pump pressure between 10\u201315 bar with no more than 5% variation across the boom.<\/p>\n

      Easy, On-the-Fly Control<\/h3>\n

      A cab-mounted lever or optional solenoid lets you shift ratios without stopping. Pair it with rate-controller GPS and the agricultural sprayer gearbox auto-adjusts RPM to ground speed, keeping chemical rates within \u00b12% per acre.<\/p>\n

      Pump Kicks In, Spray Goes Out<\/h3>\n

      With stable low-speed drive, the pump pressurizes the tank mix and pushes it through hoses to fan nozzles. Real-world test: D21A + 200-gal tank + 80-ft boom at 5\u20137.5 mph delivers 150\u2013250 \u00b5m droplets at 40\u201360 drops\/cm\u00b2\u2014right in the sweet spot for effective control.
      \nSelf-Lubricating, Low Maintenance
      \n85W-90 gear oil bath keeps internals cool (max 45\u00b0C rise). A magnetic drain plug grabs metal particles; change oil once a season in under 5 minutes.<\/p>\n

      In short, The product delivering the right speed, pressure, and reliability every pass. The D21A bolts on, runs out of the box, and keeps accuracy and uptime high.<\/p>\n

      \"agricultural-sprayer-gearbox-<\/p>\n

      Common Troubleshooting for the Agricultural Sprayer Gearbox<\/h2>\n

      An Bo\u00eete de vitesses pour pulv\u00e9risateur agricole<\/strong> will throw the occasional hiccup\u2014catch it early and you\u2019re back spraying in minutes. Here\u2019s what usually goes wrong in the field, using the D21A (direct Comer D21A replacement) as the reference, plus straightforward fixes.<\/p>\n

      Gear Slip or Skip<\/h3>\n

      Signs<\/strong>: Sudden clack or clunk; pump RPM lags behind PTO.<\/p>\n

      Causes<\/strong>: Worn teeth, low oil, or misalignment.<\/p>\n

      Fix<\/strong>: Pop the cover\u2014replace the gear set if tooth damage exceeds 0.04 in. Top off 85W-90 gear oil if level sits 0.4 in. below the sight glass. Shim for centerline error over 0.008 in. In practice, fresh oil alone stops 95% of slip.<\/p>\n

      Noise or Vibration<\/h3>\n

      Signs<\/strong>: Buzzing box, hand-feel shake.<\/p>\n

      Causes<\/strong>: Loose bolts, pitted bearings, shaft runout.<\/p>\n

      Fix<\/strong>: Torque 8.8-grade bolts to 59 ft-lb. Swap bearings (6207) if play exceeds 0.002 in. Dial-indicator check: keep radial runout under 0.001 in. Noise typically drops 15 dB after tightening.<\/p>\n

      Oil Leaks<\/h3>\n

      Signs<\/strong>: Drips under the box or at shaft ends.<\/p>\n

      Causes<\/strong>: Hardened seals, hairline case cracks.<\/p>\n

      Fix<\/strong>: Replace lip seals (35\u00d752\u00d77 mm) if the edge is rolled. Epoxy-weld case cracks under 1.2 in.; longer cracks mean a new housing. Post-seal-swap leak rate stays below 0.5% for 500 hours.<\/p>\n

      Overheating<\/h3>\n

      Signs<\/strong>: Housing hotter than 175 \u00b0F after one hour.<\/p>\n

      Causes<\/strong>: Overloaded PTO, dirty oil, blocked cooling fins.<\/p>\n

      Fix<\/strong>: Stay under 60 hp continuous draw. Change oil if it\u2019s black or gritty. Clear mud from fins. Cutting load 10% usually drops temp 35 \u00b0F.<\/p>\n

      Output Shaft Binding<\/h3>\n

      Signs<\/strong>: Pump won\u2019t build pressure or shaft drags.<\/p>\n

      Causes<\/strong>: Seized bearings, bent shaft, loose coupling.<\/p>\n

      Fix<\/strong>: Hand-spin output\u2014resistance should be under 3.5 ft-lb. Straightedge check: replace shaft if bend exceeds 0.004 in.\/ft. Blue-thread-lock coupling bolts to 30 ft-lb. New bearings bring idle noise below 75 dB.<\/p>\n

      Uneven Spray or Flow Drift<\/h3>\n

      Signs<\/strong>: Boom ends show pressure gaps.<\/p>\n

      Causes<\/strong>: RPM flutter or pump starvation.<\/p>\n

      Fix<\/strong>: Tachometer on output shaft\u2014hold fluctuation within \u00b15 RPM by checking gear mesh. Clean pump inlet strainer if 50% clogged. Steady output brings chemical rate variance back to \u00b13% per acre.<\/p>\n

      PTO Quick-Disconnect Pop-Off<\/h3>\n

      Signs<\/strong>: Power cuts on sharp turns.<\/p>\n

      Causes<\/strong>: Worn lock pin or tired spring.<\/p>\n

      Fix<\/strong>: Replace pin if diameter is under 0.31 in.; swap spring pack if free length dips below 1.38 in. OEM quick-couplers are good for 500 hours\u2014swap preventively.<\/p>\n

      Spend 20 minutes at season\u2019s end\u2014check oil, snug bolts, listen for odd sounds\u2014and you\u2019ll head off 80% of downtime. Downtime costs more than parts\u2014keep a D21A repair kit on the shelf for peace of mind.<\/p>\n

      \"Bo\u00eete<\/p>\n

      PTO Shafts for Agricultural Sprayer Gearbox<\/strong><\/h2>\n

      The PTO shaft is the vital link that feeds tractor power straight into the Sprayer Gearbox, driving the spray pump with zero fuss. Standard 6-spline or 21-spline ends, lengths from 31 in. to 59 in., fit 30\u201380 hp tractors without a hitch. The tube is ST52 seamless steel, 0.12 in. wall, rated to handle 885 ft-lb of twist\u2014plenty for sharp turns in the field without buckling.
      \nSafety shield is CE-marked with dual anti-rotation chains; at 1,000 RPM you\u2019ll barely hear it over 85 dB. Greaseable U-joints\u2014hit the zerk every 50 hours and cross wear stays under 0.0008 in. per season. Shear-bolt protection snaps on overload to save the gearbox; swap the bolt in five minutes and you\u2019re rolling again.<\/p>\n

      \"PTO<\/p>\n

      Agricultural Sprayer Gearbox Manufacturer-HZPT<\/strong><\/h2>\n

      Agricultural Sprayer Gearbox Manufacturer
      \nHangzhou Ever-Power Transmission Co., Ltd. focuses on precision mechanical and hydraulic powertrain solutions. Our core lineup includes planetary gearboxes, worm reducers, inline helical units, parallel-shaft helical gear sets, helical-bevel reducers, helical-worm drives, agricultural sprayer gearboxes, tractor PTO transmissions, automotive drivelines, power-output shafts, and custom reducer assemblies. We also supply supporting components such as sprockets, vacuum pumps, fluid couplings, racks, timing pulleys, UDL speed variators, V-belt sheaves, hydraulic cylinders, gear pumps, screw compressors, and low-backlash worm reducers.
      \nEvery sprayer gearbox leaves our floor only after passing multi-stage inspection on CMM coordinate machines, magnetic particle flaw detectors, and dynamometer test benches. Our engineering team averages 12 years in ag-machinery design, and our ISO 9001-certified process controls every step from raw-material incoming to final packaging.
      \nWe welcome OEM drawings for fully custom gearboxes, gear motors, or hydraulic integrations. Lead times for standard D21A replacements are typically 12\u201315 working days; prototype runs for new ratios can be ready in 4 weeks.<\/p>\n

      \"Atelier<\/p>\n

      FAQ<\/h2>\n

      How does the D21A gearbox improve spraying efficiency?<\/h3>\n

      The D21A gearbox ensures precise speed and pressure control, which leads to more uniform chemical distribution. It reduces chemical waste by 8-12% per hectare, improves coverage, and increases operational efficiency, allowing you to cover larger areas in less time with reduced fuel consumption.<\/p>\n

      What are the common applications for the D21A agricultural sprayer gearbox?<\/h3>\n

      The D21A gearbox is used in various agricultural applications, including crop protection, precision fertilizing, seed coating, and orchard spraying. It is compatible with sprayers used in corn, wheat, vineyards, orchards, and even greenhouse operations.<\/p>\n

      How often does the D21A gearbox require maintenance?<\/h3>\n

      The D21A gearbox requires minimal maintenance, mainly checking the gear oil and tightening bolts once a season. With proper care, it can last over 4,500 hours before needing a major overhaul, thanks to its durable design and upgraded seals.<\/p>\n

      Can the D21A gearbox be used with different types of sprayers?<\/h3>\n

      Yes, the D21A gearbox is compatible with most tractor-mounted and self-propelled sprayers, including models from manufacturers like John Deere, Case IH, and New Holland. It can also be adapted to various sprayer setups by adjusting the PTO speed and replacing the pulley if necessary.<\/p>\n

      Avis clients<\/h2>\n

      \u2b50\u2b50\u2b50\u2b50\u2b50
      Carlos Rivera, Farm Equipment Manager, GreenField Farms, Mexico
      We\u2019ve been using the D21A replacement gearbox in our orchard sprayers for the past season, and it’s been a game changer. It handles high torque with ease and has significantly improved our spraying efficiency. The gearbox is reliable, low-maintenance, and installation was quick. Highly recommended for anyone looking for durability and smooth performance in tough conditions.<\/p>\n

      \u2b50\u2b50\u2b50\u2b50
      Lena Johansen, Sprayer Operations Lead, Nordic Agriculture, Denmark
      The D21A gearbox is a solid upgrade for our field sprayers. It has reduced downtime and improved chemical distribution. However, it does produce slightly more noise compared to our previous model, but the performance makes up for it. Overall, it’s a great choice for high-demand spraying operations.<\/p>\n

      \u2b50\u2b50\u2b50\u2b50\u2b50
      Raj Patel, Maintenance Supervisor, Harvest Solutions, India
      We switched to the D21A gearbox on our sprayers, and the improvement has been noticeable. It\u2019s more durable than the previous model and handles the pressure well, even with fluctuating tractor speeds. The gearbox has reduced our maintenance needs and keeps the system running smoothly. Worth the investment!<\/p>\n

      \u2b50\u2b50\u2b50\u2b50\u2b50
      Tom\u00e1s G\u00f3mez, Equipment Manager, EcoSpray Services, Spain
      The D21A gearbox was an easy replacement for our older model. We’ve put it to the test in both vineyard and orchard spraying, and it\u2019s performed flawlessly. It offers excellent speed control and precision. It’s definitely made spraying more efficient and less wasteful. Definitely worth every penny!<\/p>\n

      \u2b50\u2b50\u2b50\u2b50\u2b50
      Sophie M\u00fcller, Operations Manager, FarmTech Solutions, Germany
      The D21A gearbox has been fantastic for our high-pressure sprayers. We’ve noticed a significant increase in coverage, and the gearbox has been running smoothly with minimal maintenance. It\u2019s easy to install and adapt to different sprayer setups, which has made our operation much more efficient.<\/p>","protected":false},"excerpt":{"rendered":"

      This gearbox is a direct replacement for the Comer D21A, designed to power sprayer pumps with high torque and ensure even chemical distribution. Built for durability, it is compatible with sprayers from brands like John Deere (6000 Series), Case IH (Patriot), and Kubota (M-Series). The robust design protects internal components, ensuring reliable performance in tough agricultural conditions.<\/p>","protected":false},"featured_media":3245,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[1870,1874],"product_tag":[],"class_list":{"0":"post-3246","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-uncategorized","7":"product_cat-agricultural-sprayer-gearbox","9":"first","10":"instock","11":"shipping-taxable","12":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/gearboxagricultural.com\/fr_fr\/wp-json\/wp\/v2\/product\/3246","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gearboxagricultural.com\/fr_fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/gearboxagricultural.com\/fr_fr\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/gearboxagricultural.com\/fr_fr\/wp-json\/wp\/v2\/comments?post=3246"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gearboxagricultural.com\/fr_fr\/wp-json\/wp\/v2\/media\/3245"}],"wp:attachment":[{"href":"https:\/\/gearboxagricultural.com\/fr_fr\/wp-json\/wp\/v2\/media?parent=3246"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/gearboxagricultural.com\/fr_fr\/wp-json\/wp\/v2\/product_brand?post=3246"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/gearboxagricultural.com\/fr_fr\/wp-json\/wp\/v2\/product_cat?post=3246"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/gearboxagricultural.com\/fr_fr\/wp-json\/wp\/v2\/product_tag?post=3246"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}