Tractor three-point implement hitches · Category 0–4 linkages with top link pins of 16–44 mm, lift arm pins of 16–51 mm and lower hitch spacing of 510–1,220 mm, plus quick hitches that lock implement pins automatically
An implement hitch connects a tractor to a mounted implement such as a plough, cultivator or mower. On the three-point linkage, two hydraulically controlled lower lift arms and an upper top link attach to pins on the implement, and the hitch category sets the pin sizes and spacing that must match. Ask three things first: which category the tractor and implement use, whether a narrow variant or a quick hitch is involved, and what lift capacity the tractor has at the implement.
Rear-mounted three-point linkage hitch components and quick hitches for agricultural tractors: lower links or lift arms, top link, hitch pins and balls, and quick-hitch frames. Drawbars and towing hitches for trailed implements, PTO drive shafts, and front linkages are outside this page.
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01
Wikipedia describes the three-point hitch as three movable arms: two lower lift arms controlled by the tractor hydraulics, which lift, lower and can tilt the implement, and an upper centre top link. Each arm has an attachment for the implement, whose posts pass through holes in the hitch and are secured with pins. In draft control systems, the draft of the implement is sensed on the top link and the hydraulics raise or lower the arms as the draft changes. [1]
Wikipedia's table lists five categories. Category 0: up to 20 hp (15 kW), top link and lift arm pins 5/8 in (16 mm), lower hitch spacing 20 in (510 mm). Category 1: 20–45 hp (15–34 kW), top link pin 3/4 in (19 mm), lift arm pin 7/8 in (22 mm), spacing 28 in (710 mm). Category 2: 40–100 hp (30–75 kW), 1 in (25 mm) and 1 1/8 in (29 mm), 34 in (860 mm). Category 3: 80–225 hp (60–168 kW), 1 1/4 in (32 mm) and 1 7/16 in (37 mm), 40 in (1,020 mm). Category 4: more than 180 hp (134 kW), 1 3/4 in (44 mm) and 2 in (51 mm), 48 in (1,220 mm). [1]
Narrow hitches, designated N, use the pin size of a listed category with the spacing of the category one step lower, which lets larger tractors connect to smaller implements; the page cites ISO 730:2009 for categories 1N, 1, 2N, 2, 3N, 3, 4N and 4. [1] Editorial calculation: lower hitch spacing grows by 1,020 − 710 = 310 mm from Category 1 to Category 3. [1]
Lift capacity is a tractor rating tested under ISO 789-2:2018, which specifies two measurements for rear-mounted three-point linkages: the maximum vertical force the hydraulic lift can exert at the lower hitch points throughout their full range of movement, and the maximum vertical force at a point 610 mm to the rear of the hitch points on a frame attached to the linkage, again throughout the full range of movement. The standard's scope notes that the static test results are used only to compare tractors, not to recommend the size of implement a tractor can carry, and that the procedure can also be used for front-mounted three-point hitches. [3]
When a hitch or quick-hitch supplier quotes a capacity, ask whether it is the tractor's ISO 789-2 figure at the hitch points, the figure at 610 mm behind them, or the rated load of the hitch part itself, and check the implement's centre of gravity against the tractor maker's figure measured at the matching point. [3]
Because the three-point hitch is rigid, tractor body roll on uneven ground passes straight to the mounted implement. A 2025 Shandong University of Technology study retrofitted a tractor's rear hitch by replacing the left and right lift links with double-acting hydraulic cylinders fitted with piston-rod stroke sensors, driven from the tractor's external multi-way valve. In static tests the system brought the implement roll angle from ±10° to 0° within 1.3 s; in field tests it held a maximum absolute error of 0.91°, a mean absolute error of 0.19° and an RMS error of 0.28°, staying within 0.5° for 92.52% of the time, and limited implement deviation to ±1.5° under a sudden 5° tractor roll. [4]
Give the supplier the tractor make, model and power, its linkage category and any narrow variant, the implement and its category, lower link and top link lengths needed, pin and ball sizes, whether a quick hitch is used, required lift capacity at the implement, and material and finish.
02
Kubota Australia lists Land Pride QH series quick hitches: QH05 and QH16 for Cat I, QH20 for Cat II and QH30 for Cat III, weighing 17, 32, 54 and 79 kg, with overall widths of 830, 810, 1,016 and 1,175 mm, heights of 514 to 727 mm and lengths of 165 to 241 mm. Automatic locks on the lower arms are standard on all four; the top hook is adjustable on the QH16 and stationary on the others. [2]
The page states that not all 3-point products are quick-hitch adaptable, and that the adjustable top hook gives the QH15 and QH16 a better chance of fitting older attachments; an optional floating top link is required for Land Pride implements with a swiveling top hitch, to prevent binding over ditches or undulations. [2]
Editorial calculation: the QH30 at 79 kg weighs about 4.6 times the QH05 at 17 kg. [2]
03
No manufacturer record has been reviewed for this product yet. Send your specification and CNFX will match it against manufacturer records.
Ask any supplier for the linkage category and standard, pin and ball diameters, lower hitch spacing, link lengths and adjustment range, rated load or lift capacity, material and heat treatment, surface finish, weight, quick-hitch compatibility and locking, and test or inspection records.
04
This is a functional reference built from the sources cited; it is not one maker's specification.
| Part | Role | Fix in the order |
|---|---|---|
| Lower lift arms | Lift, lower and tilt the implement. [1] | Category; length. |
| Top link | Upper centre link; draft may be sensed here. [1] | Pin; length. |
| Hitch pins and balls | Secure implement posts. [1] | Diameter. |
| Quick-hitch frame | Locks lower pins automatically. [2] | Category; weight. |
| Top hook | Stationary or adjustable. [2] | Type. |
| Floating top link | Prevents binding with swivel hitches. [2] | Option. |
| Hydraulic lift-link cylinders (leveling option) | Replace the lift links to tilt the implement against tractor roll. [4] | Stroke sensor; valve connection. |
05
A hitch quotation needs values for your tractor and implements. The table explains each field, gives published values where a reviewed source states them, and says what to obtain from the supplier.
| Field | What it means and published values | Ask the supplier for |
|---|---|---|
| Hitch Category | Category 0–4, with narrow N variants. [1] | Category; standard. |
| Hitch Pin Diameter (mm) | e.g. lift arm 22 mm Cat 1, 29 mm Cat 2, 37 mm Cat 3. [1] | Pin sizes. |
| Lift Capacity (kg) | Tractor rating tested at the lower hitch points and at 610 mm behind them (ISO 789-2:2018); for tractor comparison only. [3] | Capacity at the implement. |
| Lower Link Span (mm) | e.g. 710 mm Cat 1, 860 mm Cat 2, 1,020 mm Cat 3. [1] | Spacing. |
| Max Operating Temperature (°C) | Not stated in the reviewed sources. | Range. |
| Material Grade | Not stated in the reviewed sources. | Steel grade. |
| Surface Treatment (μm) | Not stated in the reviewed sources. | Finish; thickness. |
| Weight (kg) | e.g. quick hitches 17–79 kg. [2] | Weight. |
| Pivot Pin Diameter (mm) | e.g. top link pin 19 mm Cat 1, 25 mm Cat 2. [1] | Pin size. |
| Draft Link Length (mm) | Not stated in the reviewed sources. | Length; adjustment. |
| Tolerance (mm) | Not stated in the reviewed sources. | Tolerances. |
06
Paste it into your enquiry below or into an email to a maker, then replace every bracket.
Tractor: [make; model; power; category] Implement: [type; category; weight] Hitch: [three-point parts; quick hitch] Pins: [top link; lift arm; balls] Spacing and lengths: [lower spacing; link lengths] Capacity: [lift at implement] Material and finish: [grade; coating] Quantity: [sets]
No manufacturer record has been reviewed for this product yet. Send your specification and CNFX will match it against manufacturer records.
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Wikipedia lists Categories 0 to 4, each with set pin diameters and lower hitch spacing, plus narrow N variants. [1]
It uses one category's pin size with the spacing of the category one step lower. [1]
Kubota Australia lists Land Pride quick hitches with automatic locks on the lower arms for Cat I to III. [2]
ISO 789-2:2018 measures the maximum vertical force of the hydraulic lift at the lower hitch points and at a point 610 mm behind them, through the full range of movement; the results compare tractors and do not set implement size. [3]
A 2025 study replaced the lift links with stroke-sensing hydraulic cylinders and held implement roll error to a 0.19° mean (0.91° maximum) in field tests. [4]
Sources checked 2026-10-11. Wikipedia summarises three-point hitch categories and cites ISO 730; Kubota Australia distributes Land Pride quick hitches; the published scope of ISO 789-2:2018 defines how rear linkage lifting capacity is tested; a 2025 Shandong University of Technology paper measures a hydraulic hitch-leveling retrofit.
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