{"id":1336,"date":"2026-06-22T07:41:20","date_gmt":"2026-06-22T07:41:20","guid":{"rendered":"https:\/\/pto-gearbox.net\/?p=1336"},"modified":"2026-06-22T07:41:20","modified_gmt":"2026-06-22T07:41:20","slug":"water-pump-pto-gearbox-agricultural-pump-drive-engineering","status":"publish","type":"post","link":"https:\/\/pto-gearbox.net\/bg\/water-pump-pto-gearbox-agricultural-pump-drive-engineering\/","title":{"rendered":"\u0421\u043a\u043e\u0440\u043e\u0441\u0442\u043d\u0430 \u043a\u0443\u0442\u0438\u044f \u043d\u0430 \u0412\u041e\u041c \u0437\u0430 \u0432\u043e\u0434\u043d\u0430 \u043f\u043e\u043c\u043f\u0430: \u0417\u0430\u0434\u0432\u0438\u0436\u0432\u0430\u043d\u0435 \u043d\u0430 \u0441\u0435\u043b\u0441\u043a\u043e\u0441\u0442\u043e\u043f\u0430\u043d\u0441\u043a\u0438 \u043f\u043e\u043c\u043f\u0438"},"content":{"rendered":"
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\u0421\u043a\u043e\u0440\u043e\u0441\u0442\u043d\u0430 \u043a\u0443\u0442\u0438\u044f \u043d\u0430 \u0412\u041e\u041c \u0437\u0430 \u0432\u043e\u0434\u043d\u0430 \u043f\u043e\u043c\u043f\u0430: \u0417\u0430\u0434\u0432\u0438\u0436\u0432\u0430\u043d\u0435 \u043d\u0430 \u0441\u0435\u043b\u0441\u043a\u043e\u0441\u0442\u043e\u043f\u0430\u043d\u0441\u043a\u0438 \u043f\u043e\u043c\u043f\u0438<\/h1>\n

The same PTO gearbox that drives your irrigation pump today can power a firefighting pump tomorrow, fill a stock tank next week, and dewater a flooded paddock next month. PTO-driven water pumps are the most versatile hydraulic tool on any farm \u2014 and the speed increaser gearbox connecting the tractor PTO to the pump is the component that makes this versatility possible. A centrifugal irrigation pump needs 2,900 RPM; a positive-displacement slurry pump needs 400 RPM; a high-pressure firefighting pump needs 3,500 RPM \u2014 all from the same 540 RPM PTO stub. The gearbox ratio determines whether the pump delivers its design flow and pressure or runs inefficiently at the wrong speed, wasting fuel and shortening pump life.<\/p>\n

Match Your Pump Gearbox<\/a><\/p>\n<\/div>\n<\/div>\n

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Why Pump Speed Accuracy Determines Performance<\/h2>\n

A centrifugal pump’s performance \u2014 flow rate, discharge pressure, and power consumption \u2014 is governed by the affinity laws, which describe a mathematical relationship between pump speed and output that is as precise as it is unforgiving. Flow rate changes proportionally with speed: a 10 percent speed reduction produces a 10 percent flow reduction. Discharge pressure (head) changes with the square of speed: that same 10 percent speed reduction drops pressure by 19 percent. And power consumption changes with the cube of speed: the 10 percent speed reduction cuts power demand by 27 percent. These relationships mean that even a modest error in \u0421\u043a\u043e\u0440\u043e\u0441\u0442\u043d\u0430 \u043a\u0443\u0442\u0438\u044f \u043d\u0430 \u0412\u041e\u041c<\/a> ratio \u2014 producing 2,600 RPM instead of the pump’s design speed of 2,900 RPM \u2014 reduces flow by 10 percent, pressure by 20 percent, and shifts the pump’s operating point off its efficiency curve into a region of higher vibration, increased cavitation risk, and accelerated seal wear.<\/p>\n

The cube-law power relationship also works in reverse and with potentially dangerous consequences. Running a centrifugal pump 10 percent above its design speed increases power consumption by 33 percent \u2014 potentially overloading the tractor PTO and the gearbox beyond their rated capacity. A farmer who swaps a gearbox for one with a slightly higher ratio (intending to increase irrigation flow by 10 percent) actually increases the gearbox power demand by a third, with the very real possibility of overheating the gearbox, stalling the tractor engine, or triggering the PTO overload protection. This non-linear relationship between speed and power is the fundamental reason why PTO pump gearbox ratios must be precisely matched to the pump’s design speed rather than approximated.<\/p>\n

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Centrifugal Pump Drive: The Most Common PTO Pump Application<\/h2>\n

Centrifugal pumps account for over 80 percent of PTO-driven agricultural water pump installations. They are used for flood and border-check irrigation, centre-pivot pressurisation, dam-to-field transfer, stock water supply, and emergency dewatering. The pump’s impeller must spin at its rated speed \u2014 typically 1,450 RPM (4-pole, 50 Hz equivalent), 2,900 RPM (2-pole, 50 Hz equivalent), or 3,500 RPM (2-pole, 60 Hz equivalent) \u2014 to produce the design flow and head marked on the pump’s nameplate curve.<\/p>\n

From a 540 RPM PTO, the required PTO water pump gearbox<\/strong> ratios are approximately 1:2.7 for 1,450 RPM pumps, 1:5.4 for 2,900 RPM pumps, and 1:6.5 for 3,500 RPM pumps. From a 1,000 RPM PTO, the ratios drop to 1:1.45, 1:2.9, and 1:3.5 respectively. The higher ratios (1:5.4 and above) push the limits of single-stage bevel gear design \u2014 a 1:5.4 ratio requires a pinion-to-gear tooth count combination that produces a very small pinion with limited tooth strength. Two-stage gearbox configurations (bevel stage plus helical stage, or two helical stages) distribute the total ratio across two gear meshes, allowing each stage to operate within its efficient and structurally reliable ratio range while achieving the total speed multiplication needed for high-speed pump drive.<\/p>\n

The gearbox efficiency directly affects the pump’s available power. A single-stage gearbox at 96 percent efficiency wastes 4 percent of the PTO input as heat. A two-stage gearbox at 93 percent efficiency wastes 7 percent. For a 50 HP PTO driving a pump through a two-stage gearbox, 3.5 HP is consumed by the gearbox \u2014 power that heats the gearbox oil rather than moving water. This efficiency loss is unavoidable but must be accounted for when sizing the tractor: the pump’s shaft power requirement plus the gearbox losses equals the PTO power demand. Under-sizing the tractor by ignoring gearbox losses leads to the engine running at full throttle continuously, accelerating engine wear and preventing the governor from maintaining stable PTO speed under varying pump load. For the related engineering of speed increasers in sprayer pump applications, see our detailed guide on agricultural sprayer gearbox<\/a> pump drive matching.<\/p>\n

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Positive Displacement Pump Drive: Slurry, Effluent, and High-Pressure Applications<\/h2>\n

Positive displacement pumps \u2014 including gear pumps, lobe pumps, progressive cavity pumps, and piston pumps \u2014 operate on a fundamentally different principle from centrifugal pumps. They trap a fixed volume of fluid per revolution and push it from the inlet to the outlet, regardless of discharge pressure. Their flow rate is proportional to speed (like centrifugal pumps), but their pressure capability is independent of speed \u2014 limited only by the pump’s structural strength and the relief valve setting. This pressure independence means that a positive displacement pump connected to a blocked discharge line will build pressure until something fails: the pump seal, the pipe, the gearbox, or the tractor PTO clutch.<\/p>\n

The gearbox requirement for positive displacement pumps is typically a speed reducer rather than an increaser \u2014 the opposite of centrifugal pump applications. Progressive cavity pumps for slurry and effluent operate at 200 to 600 RPM; piston pumps for high-pressure spraying and cleaning operate at 300 to 800 RPM; gear pumps for hydraulic power and fuel transfer operate at 500 to 1,500 RPM. From a 540 RPM PTO, most positive displacement pumps require either a 1:1 direct drive (rare, but possible for some gear pumps) or a 1.5:1 to 2.5:1 speed reduction. The \u0441\u0435\u043b\u0441\u043a\u043e\u0441\u0442\u043e\u043f\u0430\u043d\u0441\u043a\u0430 \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u043d\u0430 \u043a\u0443\u0442\u0438\u044f<\/strong> for a positive displacement pump application must include a pressure relief mechanism \u2014 either a relief valve in the pump’s discharge piping or a torque-limiting device in the drive train \u2014 to prevent the pump from generating destructive pressure when the discharge is restricted or blocked.<\/p>\n

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Gearbox-to-Pump Coupling: Alignment, Vibration, and Disconnect<\/h2>\n

The mechanical coupling between the gearbox output shaft and the pump input shaft must transmit the full operating torque while accommodating minor shaft misalignment, absorbing torsional vibration, and providing a convenient disconnect point for pump service. Three coupling types dominate PTO pump drive installations, each with distinct engineering trade-offs that affect gearbox loading and pump performance.<\/p>\n

Jaw couplings with elastomeric spider inserts are the most widely used coupling type for centrifugal pump drives. The spider element (available in hardness grades from Shore 80A to 64D) absorbs torsional vibration and accommodates angular misalignment up to 1 degree and parallel offset up to 0.3 mm. For most agricultural pump installations where mounting frames are fabricated rather than precision-machined, the jaw coupling’s misalignment tolerance prevents the tight-tolerance alignment problems that cause premature bearing failure in both the gearbox and the pump. Medium-hardness spiders (Shore 92A) suit the majority of applications \u2014 providing adequate vibration damping without excessive torsional deflection that would cause pump speed variation under load change.<\/p>\n

Belt drives between the gearbox output and the pump input provide inherent overload protection through belt slip, continuous speed adjustment capability through variable-diameter pulleys, and physical separation between the gearbox and pump that simplifies mounting geometry. The disadvantages are belt maintenance (tension adjustment, belt replacement), efficiency loss (3 to 5 percent, primarily from belt flexure and slip), and gradual speed reduction as belts wear and stretch \u2014 a particularly problematic characteristic for centrifugal pump applications where even a 5 percent speed decrease reduces pressure by 10 percent. Belt drives are declining in favour of direct jaw coupling as manufacturers like \u0421\u043a\u043e\u0440\u043e\u0441\u0442\u043d\u0430 \u043a\u0443\u0442\u0438\u044f Ever-Power PTO<\/a> offer gearboxes with precise ratios that eliminate the need for belt-ratio speed adjustment between the gearbox and pump.<\/p>\n

Direct flange coupling (gearbox output flange bolted directly to pump input flange) is the most compact and efficient connection but demands precise alignment between the gearbox and pump shafts. Any angular or parallel misalignment is absorbed entirely by the gearbox output bearing and the pump input bearing \u2014 there is no flexible element to compensate. Direct flanging is used on factory-integrated pump-gearbox units where both components are precision-machined to a common mounting face, but is generally not recommended for field-assembled installations where mounting frame tolerances and thermal distortion make precise alignment difficult to achieve and maintain.<\/p>\n

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Continuous-Duty Thermal Design for Irrigation Pump Gearboxes<\/h2>\n

Irrigation pumping is the most thermally demanding application for a \u0421\u043a\u043e\u0440\u043e\u0441\u0442\u043d\u0430 \u043a\u0443\u0442\u0438\u044f \u043d\u0430 \u0412\u041e\u041c<\/strong> in agriculture. An irrigation pump may run 12 to 24 hours continuously during peak water demand \u2014 far exceeding the intermittent duty cycles of mowing, tilling, or harvesting equipment that runs for hours but includes frequent pauses for turning, repositioning, and refilling. The gearbox must reach thermal equilibrium (heat generation equals heat dissipation) at an oil temperature that remains within the safe operating range of the lubricant \u2014 typically below 90 degrees Celsius for synthetic EP gear oil and below 80 degrees for mineral oil.<\/p>\n

A gearbox dissipating 3 to 5 kW of heat (typical for a 50 to 80 HP irrigation pump drive at 94 to 96 percent efficiency) in an ambient temperature of 35 degrees Celsius requires sufficient housing surface area and oil volume to stabilize at or below the 90-degree limit. Standard agricultural gearbox housings designed for intermittent-duty applications may not achieve thermal equilibrium within this limit during 24-hour continuous operation \u2014 the housing surface area is simply too small to reject the continuous heat load at the elevated ambient temperatures common during irrigation season. The solution is either a larger gearbox frame (oversized by one step relative to the torque requirement, providing additional oil volume and housing surface), or an external oil cooler (air-cooled heat exchanger) that supplements the housing’s natural heat rejection with forced convection cooling.<\/p>\n

Synthetic PAO-based EP gear oil (ISO VG 220 or manufacturer-specified equivalent) is mandatory for continuous-duty irrigation pump gearboxes. The sustained thermal loading degrades mineral oil rapidly \u2014 oxidation products form varnish deposits on internal surfaces that insulate the housing and reduce heat transfer, creating a thermal feedback loop where degraded oil causes higher temperatures that further accelerate degradation. Synthetic oil resists this oxidation cycle for 2,000 to 4,000 hours under continuous duty, compared to 500 to 1,000 hours for mineral oil at the same temperature \u2014 a cost difference of 2 to 3 times at purchase that delivers 3 to 5 times the service life, making synthetic the economically superior choice for any gearbox running more than 500 hours per season.<\/p>\n

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Application-Specific Gearbox Sizing: Irrigation, Firefighting, and Transfer<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n
\u041f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0435<\/th>\n\u0422\u0438\u043f \u043f\u043e\u043c\u043f\u0430<\/th>\nPump Speed<\/th>\nRatio (from 540)<\/th>\nTypical HP<\/th>\n<\/tr>\n<\/thead>\n
Flood\/border irrigation<\/td>\nCentrifugal (high-flow)<\/td>\n1,450 RPM<\/td>\n1:2.7 increase<\/td>\n30\u2013100<\/td>\n<\/tr>\n
Sprinkler\/pivot pressure<\/td>\nCentrifugal (high-head)<\/td>\n2,900 RPM<\/td>\n1:5.4 increase<\/td>\n20\u201380<\/td>\n<\/tr>\n
Rural firefighting<\/td>\nCentrifugal (high-pressure)<\/td>\n2,900\u20133,500 RPM<\/td>\n1:5.4\u20136.5 increase<\/td>\n15\u201340<\/td>\n<\/tr>\n
Slurry\/effluent<\/td>\nProgressive cavity<\/td>\n200\u2013500 RPM<\/td>\n1:1\u20131.5:1 reduction<\/td>\n20\u201360<\/td>\n<\/tr>\n
Stock water\/transfer<\/td>\nCentrifugal (medium)<\/td>\n2,900 RPM<\/td>\n1:5.4 increase<\/td>\n5\u201320<\/td>\n<\/tr>\n
Field dewatering<\/td>\nMixed-flow or axial<\/td>\n1,000\u20131,450 RPM<\/td>\n1:1.9\u20132.7 increase<\/td>\n15\u201350<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The sizing table illustrates a critical point: PTO pump applications span both speed increase and speed decrease requirements, with ratios ranging from 1.5:1 reduction (slurry pumps) to 1:6.5 increase (high-pressure firefighting). No single \u0441\u0435\u043b\u0441\u043a\u043e\u0441\u0442\u043e\u043f\u0430\u043d\u0441\u043a\u0430 \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u043d\u0430 \u043a\u0443\u0442\u0438\u044f<\/a> serves all pump applications \u2014 the ratio must be selected to match the specific pump’s design speed, and changing the pump (even to a different model of the same brand and size) may require a different gearbox ratio if the new pump’s rated speed differs from the original.<\/p>\n

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Maintenance for Continuous-Duty Pump Gearboxes<\/h2>\n

The oil change interval for a continuous-duty irrigation pump gearbox should reflect the actual operating hours, not the calendar-based schedule adequate for intermittent-duty equipment. A pump gearbox running 2,000 hours per irrigation season accumulates more operating hours in 6 months than a mower gearbox accumulates in 4 to 5 years. The recommended schedule is 500 hours for synthetic oil or 250 hours for mineral oil \u2014 whichever occurs first. At 12 to 16 hours per day during peak irrigation, this means a synthetic oil change every 5 to 6 weeks of continuous operation.<\/p>\n

The \u041a\u0430\u0440\u0434\u0430\u043d\u0435\u043d \u0432\u0430\u043b<\/a> driveline on pump installations accumulates wear faster than on most other agricultural applications because of the continuous rotation \u2014 U-joint needle bearings that last 2,000+ hours on a seasonal implement may reach their greasing and replacement threshold within a single irrigation season. Grease the U-joints every 8 to 10 hours of continuous pump operation (daily in a 24-hour pumping schedule) and check for play at every oil change interval. A worn U-joint on a continuous-duty pump drive creates cyclic speed variation that the pump experiences as pressure pulsation \u2014 causing fatigue damage to pipe joints and fittings that manifests as leaks at threaded connections throughout the irrigation system.<\/p>\n

Monitor the gearbox housing temperature daily during the first week of each irrigation season to establish a thermal baseline. The temperature should stabilize at a consistent level (typically 40 to 60 degrees above ambient) within 2 to 3 hours of starting and remain stable for the duration of operation. A gradual temperature increase over days or weeks indicates declining oil condition (reduced viscosity from thermal degradation), increasing bearing friction (from progressive wear or contamination), or reduced heat rejection capacity (from dust accumulation on the housing surface). A PTO water pump gearbox<\/strong> rated for continuous duty at the actual ambient temperature \u2014 not just the mechanical torque capacity \u2014 is the essential specification distinction between a gearbox that survives irrigation season and one that overheats and fails.<\/p>\n

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\nWhat gearbox ratio do I need for my water pump?+<\/span><\/summary>\n
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Divide the pump’s rated speed (on the nameplate) by your PTO speed. For example: a 2,900 RPM pump on a 540 RPM PTO requires a 1:5.37 speed increase ratio. The gearbox must match this ratio precisely \u2014 even a 10 percent speed error reduces centrifugal pump pressure by 19 percent and shifts the pump off its design operating point. Contact us with your pump model and PTO speed for an exact ratio recommendation.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nCan I increase pump flow by using a higher gearbox ratio?+<\/span><\/summary>\n
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Technically yes, but with serious caveats. The affinity laws mean that a 10 percent speed increase produces only 10 percent more flow but requires 33 percent more power (cube law). This additional power demand may exceed the tractor’s PTO capacity, overload the gearbox, and push the pump beyond its maximum rated speed \u2014 voiding the pump warranty and risking impeller failure from centrifugal stress. Always operate the pump at or below its nameplate-rated speed.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nWhat coupling should I use between gearbox and pump?+<\/span><\/summary>\n
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A jaw coupling with a Shore 92A elastomeric spider is the recommended choice for most agricultural pump installations. It accommodates the minor misalignment inherent in field-fabricated mounting frames, absorbs torsional vibration from the PTO driveline, and provides a fail-safe connection if the spider wears through. Belt drives are acceptable for low-power applications where speed adjustment is needed, but their gradual speed reduction from belt wear makes them less suitable for centrifugal pumps where speed accuracy directly determines pressure output.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nHow long can I run a PTO pump gearbox continuously?+<\/span><\/summary>\n
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A properly specified gearbox with synthetic gear oil and adequate thermal design can run 24 hours per day for the duration of the irrigation season \u2014 typically 2,000 to 3,000 hours per year. The limiting factors are oil change intervals (every 500 hours for synthetic), PTO driveline greasing (every 8 to 10 hours of continuous operation), and the tractor’s own service requirements (fuel, coolant, engine oil). Monitor gearbox temperature to confirm thermal stability during the first week of continuous operation.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nCan I use the same gearbox for different pumps?+<\/span><\/summary>\n
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Only if both pumps require the same gearbox output speed and the gearbox power rating covers the higher of the two pump power demands. A gearbox with a 1:5.4 ratio producing 2,900 RPM can drive any centrifugal pump rated at 2,900 RPM \u2014 regardless of the pump’s flow or head rating \u2014 as long as the pump’s shaft power requirement does not exceed the gearbox’s rated capacity. You cannot use the same gearbox for a 2,900 RPM irrigation pump and a 500 RPM slurry pump \u2014 the speed difference requires completely different ratios.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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\nDo you manufacture PTO pump gearboxes?+<\/span><\/summary>\n
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Yes \u2014 we manufacture speed increaser and speed reducer gearboxes for PTO pump drive applications, with ratios from 1.5:1 reduction to 1:6.5 increase covering the full range of centrifugal, positive displacement, and high-pressure pump requirements. All pump-drive gearboxes are rated for continuous duty with synthetic oil fill, and high-hour irrigation models are available with external oil cooler provisions. Contact our engineering team with your pump model, rated speed, and shaft power for a matched gearbox recommendation.<\/p>\n<\/div>\n<\/details>\n<\/div>\n

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Match Your Pump to the Right Gearbox<\/h2>\n

Send us your pump nameplate data (model, rated speed, shaft power) and your PTO speed \u2014 our engineering team will calculate the exact gearbox ratio, verify thermal capacity for your duty cycle, and recommend the correct coupling type. Precision-ratio gearboxes for irrigation, firefighting, and industrial pump drive applications, available from stock or manufactured to order.<\/p>\n

\u0421\u0432\u044a\u0440\u0436\u0435\u0442\u0435 \u0441\u0435 \u0441 \u043d\u0430\u0448\u0438\u0442\u0435 \u0438\u043d\u0436\u0435\u043d\u0435\u0440\u0438<\/a><\/p>\n<\/div>\n

\u0420\u0435\u0434\u0430\u043a\u0442\u043e\u0440: Cxm<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Water Pump PTO Gearbox: Agricultural Pump Drive Engineering The same PTO gearbox that drives your irrigation pump today can power a firefighting pump tomorrow, fill a stock tank next week, and dewater a flooded paddock next month. PTO-driven water pumps are the most versatile hydraulic tool on any farm \u2014 and the speed increaser gearbox […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[4042],"tags":[],"class_list":["post-1336","post","type-post","status-publish","format-standard","hentry","category-agricultural-gearbox"],"_links":{"self":[{"href":"https:\/\/pto-gearbox.net\/bg\/wp-json\/wp\/v2\/posts\/1336","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pto-gearbox.net\/bg\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pto-gearbox.net\/bg\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pto-gearbox.net\/bg\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pto-gearbox.net\/bg\/wp-json\/wp\/v2\/comments?post=1336"}],"version-history":[{"count":1,"href":"https:\/\/pto-gearbox.net\/bg\/wp-json\/wp\/v2\/posts\/1336\/revisions"}],"predecessor-version":[{"id":1338,"href":"https:\/\/pto-gearbox.net\/bg\/wp-json\/wp\/v2\/posts\/1336\/revisions\/1338"}],"wp:attachment":[{"href":"https:\/\/pto-gearbox.net\/bg\/wp-json\/wp\/v2\/media?parent=1336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pto-gearbox.net\/bg\/wp-json\/wp\/v2\/categories?post=1336"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pto-gearbox.net\/bg\/wp-json\/wp\/v2\/tags?post=1336"}],"curies":[{"name":"\u0440\u0430\u0431\u043e\u0442\u043d\u0430 \u0441\u0440\u0435\u0449\u0430","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}