{"id":333,"date":"2026-07-24T05:47:23","date_gmt":"2026-07-24T05:47:23","guid":{"rendered":"https:\/\/superiortransmissioninc.com\/?post_type=product&p=333"},"modified":"2026-07-24T05:52:03","modified_gmt":"2026-07-24T05:52:03","slug":"ep-13-ratio-50hp-540rpm-rotary-cultivator-gearbox","status":"publish","type":"product","link":"https:\/\/superiortransmissioninc.com\/ar\/product\/ep-13-ratio-50hp-540rpm-rotary-cultivator-gearbox\/","title":{"rendered":"EP 1:3 Ratio 50HP 540rpm Rotary Cultivator Gearbox"},"content":{"rendered":"
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Agricultural Soil Cultivation Transmission<\/p>\n

EP 1:3 Ratio 50HP 540rpm Rotary Cultivator Gearbox<\/h2>\n

A purpose-built rotary cultivator gearbox delivering a 1:3 step-up ratio at 540 rpm PTO input \u2014 rated at 50HP with optic axis input and output shafts for direct integration with standard tractor three-point linkage cultivator assemblies worldwide.<\/p>\n

\u00a0\u0639\u0644\u0628\u0629 \u062a\u0631\u0648\u0633 \u0632\u0631\u0627\u0639\u064a\u0629\u00a0<\/a><\/div>\n<\/div>\n

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50 HP<\/div>\n
Rated Power<\/div>\n<\/div>\n
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540 RPM<\/div>\n
PTO Input Speed<\/div>\n<\/div>\n
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1:3<\/div>\n
Gear Ratio<\/div>\n<\/div>\n
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21 kg<\/div>\n
Net Weight<\/div>\n<\/div>\n
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1-3\/8 Z6<\/div>\n
Input Shaft<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Technical Specifications of Rotary Cultivator Gearbox<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nRotary Cultivator Gearbox Value<\/th>\n<\/tr>\n<\/thead>\n
Model Reference<\/td>\nEP \/ HC-9.311 Rotary Cultivator Gearbox<\/td>\n<\/tr>\n
Gear Ratio<\/td>\n1:3<\/td>\n<\/tr>\n
Tooth Count (Z)<\/td>\n36\/12<\/td>\n<\/tr>\n
Module<\/td>\n4.35<\/td>\n<\/tr>\n
Rated Power<\/td>\n50 HP<\/td>\n<\/tr>\n
Rated Input Speed<\/td>\n540 rpm<\/td>\n<\/tr>\n
Rated Output Speed<\/td>\n1,620 rpm<\/td>\n<\/tr>\n
Input Shaft Type<\/td>\n1-3\/8 Z6 Spline<\/td>\n<\/tr>\n
Input\/Output Description<\/td>\nOptic axis \/ Optic axis<\/td>\n<\/tr>\n
Net Weight<\/td>\n21 kg<\/td>\n<\/tr>\n
Overall Height<\/td>\n155 mm<\/td>\n<\/tr>\n
Overall Width<\/td>\n243 mm (162 + 81)<\/td>\n<\/tr>\n
Flange Depth (input side)<\/td>\n81 mm<\/td>\n<\/tr>\n
Output Shaft Length<\/td>\n82 mm<\/td>\n<\/tr>\n
Input Shaft Bore Depth<\/td>\n38.1 mm<\/td>\n<\/tr>\n
Top Dimension (X ref.)<\/td>\n97 mm<\/td>\n<\/tr>\n
Housing Material<\/td>\nCast Iron<\/td>\n<\/tr>\n
Lubrication<\/td>\nOil Bath<\/td>\n<\/tr>\n
Gear Type<\/td>\nHelical Bevel<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

\"superiortransmissioninc-products-EP<\/p>\n

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How This Rotary Cultivator Gearbox Works<\/h2>\n

At the mechanical core of this gearbox rotary cultivator unit is a helical bevel gear transmission that converts the 540 rpm PTO rotational input into a 1,620 rpm output \u2014 a 1:3 speed multiplication achieved through a 36-tooth ring gear meshing with a 12-tooth pinion. The 36\/12 tooth configuration and the 4.35 module gear geometry together define the contact ratio and load-sharing characteristics of the mesh. A higher module number generally indicates larger gear teeth, which in turn carry more torque per unit face width \u2014 relevant for a 50HP application where instantaneous peak torques during tine-to-stone impacts can reach multiples of the steady-state running torque.<\/p>\n

Both the input and output shafts use optic axis geometry \u2014 a shaft design where the rotational centreline is held to a precise geometric standard through the bearing span, minimising shaft runout under load. In rotary cultivator applications, where the tine rotor assembly may be out-of-balance due to uneven soil loading across tine positions, optic axis output shafts resist induced bending moments more effectively than plain shafts, protecting the output bearing from premature fatigue. The 1-3\/8 Z6 spline input connects directly to the standard agricultural PTO shaft without adapters on virtually all tractor platforms used globally.<\/p>\n

Oil bath lubrication keeps the gear mesh and bearing surfaces continuously supplied with lubricant throughout cultivation operations. The sealed cast iron housing prevents soil fines, crop debris, and water ingress from reaching the working surfaces \u2014 an important feature given that rotary cultivator gearbox parts operate in close proximity to actively disturbed soil during every working pass. Thermal management is passive, relying on the oil bath circulation and housing surface area to dissipate heat generated at the gear mesh under sustained 50HP loading.<\/p>\n

\"Precision<\/p>\n<\/div>\n

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Five Key Advantages of Rotary Cultivator Gearbox<\/h2>\n
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01 \u2014 High 1:3 Step-Up Ratio<\/div>\n

The 1:3 ratio delivers 1,620 rpm output from a 540 rpm PTO input \u2014 directly matching the rotor speed requirements of most standard rotary tiller cultivator assemblies without secondary drive modifications. This avoids the energy loss, complexity, and additional maintenance burden of intermediate speed-increasing arrangements in the implement drivetrain.<\/p>\n<\/div>\n

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02 \u2014 50HP Rated Power Capacity<\/div>\n

At 50HP, this agricultural rotary cultivator gearbox covers the upper range of the mid-tractor class and the lower end of larger tractor platforms, providing meaningful headroom above typical continuous cultivation loads. This thermal and mechanical margin reduces the frequency of overload events and extends service intervals between rotary cultivator gearbox replacement operations.<\/p>\n<\/div>\n

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03 \u2014 Dual Optic Axis Shafts<\/div>\n

Both input and output shafts use optic axis geometry, maintaining shaft concentricity under dynamic loading. This is particularly important at the 1,620 rpm output speed where even minor shaft runout would generate vibration amplified by the rotary tine assembly \u2014 a direct contributor to gearbox and tractor driveline fatigue in high-speed rotary cultivation equipment.<\/p>\n<\/div>\n

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04 \u2014 Compact 21 kg Field Weight<\/div>\n

Weighing 21 kg net, this gearbox can be installed, removed, and exchanged by a two-person service team without mechanical lifting equipment \u2014 important for contractors operating across multiple fields or across regions where workshop access is limited. The compact dimensional envelope also preserves implement linkage geometry on smaller three-point hitch configurations.<\/p>\n<\/div>\n

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05 \u2014 Universal PTO Compatibility<\/div>\n

The 1-3\/8 Z6 splined input is the globally standardised agricultural PTO connection, ensuring direct compatibility with tractor PTO shafts from all major manufacturers without adapter sleeves or custom coupling components. This simplifies procurement for dealers and OEM cultivator manufacturers who need a gearbox rotary cultivator drive that integrates cleanly across multiple tractor brands.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Materials & Construction of Rotary Cultivator Gearbox<\/h2>\n

The housing of this rotary cultivator gearbox is produced from GG25 grey cast iron \u2014 a material chosen for its combination of compressive strength, machinability, and vibration attenuation. In soil cultivation applications, vibration damping at the housing level prevents resonance from building up between the high-speed output shaft and the tractor three-point linkage frame, which in under-damped designs can cause premature fatigue cracking at mounting bosses and bolt holes. The housing exterior is phosphate-treated and painted for corrosion protection, which matters in the consistently moist and abrasive environments encountered during spring seedbed preparation and autumn stubble tillage operations.<\/p>\n

The 36\/12 helical bevel gear set is machined from case-hardened chromium-molybdenum alloy steel. Tooth flanks are finish-ground after case hardening to maintain the gear profile accuracy required for quiet, low-vibration operation at 1,620 rpm output speed. The 4.35 module tooth geometry provides adequate root section thickness to resist bending fatigue under the cyclic shock loads generated when tines encounter stones or compacted soil pans, without making the gear set excessively large for the application envelope. Both the optic axis input shaft and output shaft are medium-carbon alloy steel with induction hardening applied at bearing seating and spline zones.<\/p>\n

Bearings are angular contact or tapered roller types selected to handle the combined radial and axial thrust generated at the helical bevel gear mesh. All bearing seats are machined to H7\/p6 interference fit tolerance to prevent outer race rotation under dynamic load. Shaft seals are double-lip polyacrylate rubber types rated for gear oil contact and field dust contamination resistance, providing the dual retention and exclusion function critical in open-field cultivator operating conditions.<\/p>\n<\/div>\n

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Application Scenarios of Rotary Cultivator Gearbox<\/h2>\n

What is a rotary cultivator used for? In practice, rotary cultivators are tractor-mounted implements that use powered tines to break, invert, and pulverise soil \u2014 preparing seedbeds, incorporating crop residue, controlling weeds, and aerating compacted ground. The EP 1:3 ratio rotary cultivator gearbox is the core power transmission component that makes these operations possible at a tractor PTO, translating the 540 rpm shaft speed into the tine rotor speed required for effective soil engagement. The following field applications represent the primary working environments for this unit.<\/p>\n

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Seedbed Preparation<\/h3>\n

Market gardeners, horticultural growers, and arable farmers across the Netherlands, UK, France, and North America use rotary cultivators to create fine, even seedbeds from previously ploughed or disced ground. The 1:3 ratio output speed ensures tines rotate fast enough to produce the tilth fineness required for small-seed vegetable and cereal crops without requiring secondary bed-forming passes.<\/p>\n<\/div>\n

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Stubble & Residue Incorporation<\/h3>\n

Following cereal or maize harvest, rotary cultivators are used to chop and incorporate straw and root residue into the top 100\u2013150 mm of soil \u2014 accelerating decomposition and preparing the field for the following crop without waiting for natural breakdown. The 50HP rating of this rotary tiller gearbox accommodates the higher draft forces encountered when processing dense, wet post-harvest residue.<\/p>\n<\/div>\n

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Weed Control & Inter-Row Cultivation<\/h3>\n

Organic and reduced-herbicide farming systems in Germany, Scandinavia, and increasingly across North American and Australian organic certification areas rely on mechanical inter-row cultivation for weed suppression. Rotary tine systems using agricultural rotary cultivator gearbox units drive narrow-row toolbars between crop rows at speeds that uproot and desiccate weed seedlings without damaging established crops.<\/p>\n<\/div>\n

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Orchard & Vineyard Floor Management<\/h3>\n

Compact rotary cultivators fitted with this gearbox rotary cultivator drive are widely used in French, Italian, Spanish, and South American viticulture and orchard management to work the soil between rows \u2014 controlling grass and weed competition, improving water infiltration, and incorporating cover crop biomass before vine and tree root zones are affected by competition.<\/p>\n<\/div>\n

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Sports Field & Amenity Ground Renovation<\/h3>\n

Local authorities, sports ground contractors, and golf course maintenance teams in the UK, Ireland, and across northern Europe use compact rotary cultivators for pitch renovation, overseeding preparation, and compaction relief on playing surfaces. The relatively lightweight 21 kg gearbox facilitates integration with the small-frame tractors commonly used in amenity ground management.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Regulatory & Compliance Considerations by Region<\/h2>\n

Rotary cultivators and their drive components are classified as agricultural machinery under the regulatory frameworks of most major trading regions, and purchasers should verify applicable safety and compliance requirements in their territory before deploying this agricultural rotary cultivator gearbox.<\/p>\n

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European Union<\/h3>\n

Rotary cultivators placed on the EU market are subject to the Machinery Directive 2006\/42\/EC and require CE marking with a conformity assessment addressing PTO connection guarding, tine contact hazards, and soil throw protection. ISO 11684 governs safety labelling on agricultural machinery. EN ISO 4254-1 sets general agricultural machinery safety requirements, and EN 12665 addresses noise emission measurement. The EU Machinery Regulation (EU) 2023\/1230 will replace the current directive from January 2027 and introduces expanded digital declaration requirements.<\/p>\n<\/div>\n

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United Kingdom<\/h3>\n

In GB, the Supply of Machinery (Safety) Regulations 2008 requires UKCA marking for new machinery placed on the market. HSE’s PUWER 1998 governs inspection, maintenance, and safe use of agricultural plant in employment settings. Specifically for rotary cultivators and tine-driven implements, HSE guidance on PTO shaft guarding and rear-discharge soil throw zones applies to professional agricultural and amenity use of rotary tiller cultivator gearbox equipment.<\/p>\n<\/div>\n

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United States & Canada<\/h3>\n

In the United States, ASABE S318 covers PTO drive connection dimensions and guarding requirements for all tractor-mounted implements including rotary tiller drives. OSHA 29 CFR 1910.212 mandates point-of-operation guarding for powered machinery in commercial agricultural operations. In Canada, provincial WCB\/OHS regulations and CSA B354 series standards govern equipment safety, requiring that rotary cultivator gearbox replacement parts maintain the original machinery’s risk profile and guarding integrity.<\/p>\n<\/div>\n

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Australia & New Zealand<\/h3>\n

AS 4024 (Safeguarding of Machinery) and Safe Work Australia’s model codes of practice for plant and equipment set the applicable requirements for rotary cultivator drives used in Australian agricultural and amenity applications. New Zealand’s WorkSafe Aotearoa enforces equivalent obligations under the Health and Safety at Work Act 2015. Both jurisdictions require that PTO guarding and tine throw protection remain in place and in serviceable condition throughout the equipment’s operational life.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Compatible Products & One-Stop Supply<\/h2>\n

This rotary cultivator gearbox is designed to work as part of a complete soil cultivation driveline. We produce the full range of components \u2014 from tractor PTO connection through to implement rotor hub \u2014 enabling single-source procurement for equipment integrators, agricultural machinery dealers, and contractors who need confirmed system compatibility rather than individually sourced components that may not share dimensional standards.<\/p>\n

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Rotary Cultivators<\/h3>\n

We supply complete tractor-mounted rotary cultivator<\/a> implements engineered around this gearbox platform, with tine rotor assemblies, frame sections, and depth control mechanisms pre-matched to the 1:3 output ratio and optic axis output shaft geometry. \"superiortransmissioninc-Rotary<\/p>\n<\/div>\n

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PTO Driveshafts<\/h3>\n

Correct PTO shaft selection ensures power reaches this gearbox without driveline overload or vibration issues. Our shaft range covers the full spectrum of agricultural PTO applications \u2014 standard-angle, wide-angle, and high-speed types \u2014 all available with the 1-3\/8 Z6 female yoke compatible with this rotary tiller gearbox input.<\/p>\n

\"Compatible<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n

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About Our Manufacturing Facility<\/h2>\n

With over a decade of hands-on mechanical engineering and manufacturing experience, our production facility is focused on the precision design and fabrication of agricultural and industrial transmission equipment. The facility operates under ISO 9001:2015 certification covering the full production process \u2014 from incoming material inspection through gear machining, assembly, and final functional testing \u2014 ensuring that every rotary cultivator gearbox for sale leaving our production line meets consistent dimensional and performance standards.<\/p>\n

Our product scope spans agricultural gearboxes, worm gear reducers, planetary gear drives, hydraulic cylinders, PTO shafts, gears, sprockets, chains, worm gears, pulleys, and electric motors. Beyond standard catalogue items, we design and produce custom-specification gearbox assemblies across ductile iron, grey cast iron, cast steel, precision cast steel, and cast aluminium \u2014 as well as individual mechanical components to non-standard drawings for OEM customers requiring rotary cutter gearbox configurations outside our standard product range. Custom ratio, shaft arrangement, and mounting configurations can be developed from customer specification to production sample with full dimensional and performance documentation.<\/p>\n

Workshop<\/h3>\n
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\"Agricultural
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Frequently Asked Questions<\/h2>\n
\nQ1. What is the gearbox for a rotary tiller and why does the gear ratio matter for different soil types in European farming conditions?<\/summary>\n
A rotary tiller gearbox converts the tractor PTO rotational input into the higher rotor speed needed to drive the tine assembly. In European farming conditions \u2014 which range from the light sandy soils of coastal Netherlands to the heavy clay and stony ground of UK upland farms \u2014 gear ratio selection directly affects tine impact energy per revolution and soil pulverisation quality. A 1:3 ratio producing 1,620 rpm at 540 rpm PTO input is widely suited to standard seedbed work across most European soil types, though operators working in very stony conditions may prefer a slightly lower output speed to reduce tine impact severity.<\/div>\n<\/details>\n
\nQ2. How often should I service a 50HP agricultural rotary cultivator gearbox used in intensive market garden seedbed preparation in the UK or Australia?<\/summary>\n
For intensive market garden use \u2014 where cultivators may run 6 to 10 hours daily during peak seedbed preparation periods \u2014 we recommend oil level inspection at the start of each working week and a complete oil drain and refill every 100 hours or at the end of each cultivation season, whichever arrives first. Seal condition should be checked visually at each oil inspection for signs of weeping or soil contamination in the oil. Any sign of tine impact that transmits an unusual shock through the driveline should prompt a bearing and shaft alignment check before resuming work.<\/div>\n<\/details>\n
\nQ3. Which agricultural rotary cultivator gearbox parts are most likely to need replacement after two or three seasons of stony ground cultivation in North American grain belt conditions?<\/summary>\n
In stony North American grain belt soils, the components most frequently needing attention are the output shaft bearing (due to tine impact shock), the output shaft lip seal (from continuous soil contact contamination risk), and the gear mesh tooth contact surfaces if the unit has experienced repeated overload events from stone strikes without adequate shock-limiter protection in the driveline. Fitting a shear bolt or torque limiter coupling in the PTO shaft between tractor and gearbox is strongly recommended to protect the gearbox interior from the most severe impact events.<\/div>\n<\/details>\n
\nQ4. Where can I find a reliable rotary cultivator gearbox replacement that fits standard three-point hitch cultivators used by French and German vegetable growers?<\/summary>\n
When sourcing a rotary cultivator gearbox replacement for French or German vegetable production equipment, confirm the existing unit’s mounting flange bolt pattern, the output shaft diameter and spline specification, and the installed gear ratio before ordering. The EP 1:3 unit uses optic axis output shaft geometry and a standard flange mounting that is compatible with the majority of European-market rotary cultivator frames using 1-3\/8 Z6 PTO input drives. Cross-reference the original equipment’s shaft length and flange depth against the EP unit dimensions to confirm direct fit.<\/div>\n<\/details>\n<\/div>\n<\/div>\n

Editor: PXY<\/p>","protected":false},"excerpt":{"rendered":"

The EP 1:3 Ratio 50HP 540rpm unit is a heavy-duty agricultural rotary cultivator gearbox engineered for tractor-driven soil tillage operations where high output shaft speed relative to PTO input is the defining requirement. Based on the proven HC-9.311 platform, this rotary cultivator gearbox delivers a 1:3 step-up ratio from the standard 540 rpm agricultural PTO input \u2014 generating an output speed of 1,620 rpm at the cultivator rotor shaft under rated conditions. With a 50HP power capacity and a compact 21 kg net weight, it combines meaningful power density with a practical field weight that simplifies installation and removal during implement changeovers.<\/p>\n

The input is a 1-3\/8 Z6 splined shaft connection \u2014 the global agricultural standard \u2014 feeding into a 36\/12 tooth helical bevel gear set with a module of 4.35. Both the input and output interfaces use optic axis shaft geometry, which maintains precise rotational concentricity across the gear mesh under the variable loading conditions typical of soil cultivation work.<\/p>","protected":false},"featured_media":334,"template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[24],"product_tag":[],"class_list":["post-333","product","type-product","status-publish","has-post-thumbnail","product_cat-rotary-cultivator-gearbox","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/superiortransmissioninc.com\/ar\/wp-json\/wp\/v2\/product\/333","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/superiortransmissioninc.com\/ar\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/superiortransmissioninc.com\/ar\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ar\/wp-json\/wp\/v2\/media\/334"}],"wp:attachment":[{"href":"https:\/\/superiortransmissioninc.com\/ar\/wp-json\/wp\/v2\/media?parent=333"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ar\/wp-json\/wp\/v2\/product_brand?post=333"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ar\/wp-json\/wp\/v2\/product_cat?post=333"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ar\/wp-json\/wp\/v2\/product_tag?post=333"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}