Hydraulic top link category 2

A Category 2 hydraulic top link is a hydraulically adjustable component mainly used in agriculture to flexibly adjust the height and angle of three-point implements (such as plows, harrows, mulchers, or mowers) on the rear of tractors. It replaces the manual mechanical top link and allows convenient adjustment directly from the cab. At its core, it is a hydraulic cylinder with an integrated check valve.

The integrated check valve has a key safety function: it allows hydraulic fluid to flow only in one direction and prevents backflow. This keeps the hydraulic fluid in the cylinder and the top link maintains its position securely. Without this valve, a pressure loss or leakage could result in uncontrolled movements or sudden lowering of the implement – a risk to both operator and machine.

• Comfort and efficiency: Stepless adjustment during work without leaving the tractor seat.
• Precision: Real-time adaptation to varying soil conditions for better work quality and fuel efficiency.
• Safety: More stable positioning of implements, reduced risk of uncontrolled movement.
• Versatility: Easier hitching and unhitching, as well as flexible use in multiple applications.

• Tractor power: approx. 50–150 HP
• Piston rod diameter: approx. 30–35 mm
• Cylinder bore: approx. 50–70 mm
• Stroke length: 180–300 mm
• Installation length: 550–800 mm (pin center to pin center)
• Pin diameter: 25.4 mm (Cat. 2 standard)
• Operating pressure: approx. 200 bar
• Tensile and compressive forces: e.g. 1.3 t tensile, 2.2 t compressive (depending on model)

Hydraulic top links are usually made of high-strength steel. The piston rod is chrome-plated or coated to prevent corrosion. Seals and valves are made of durable plastics or elastomers. Durability is ensured through precise manufacturing, high-quality sealing systems, and regular maintenance (leak checks, lubrication, valve inspection).

• Tractor power: Suitable for 50–150 HP.
• Length: Stroke length and installation length must match tractor and implement.
• Pin diameter: Cat. 2 standard = 25.4 mm.
• Mounting type: Check compatibility with ball ends or hook ends.
• Load capacity: Match tensile and compressive forces to implement and tractor.
• Hydraulic connections: Must be compatible with tractor couplings (e.g. Euro quick couplers).
• Quality: Prefer high-quality, corrosion-resistant products.

• Leak check: Regularly inspect hydraulic hoses.
• Lubrication: Grease joints to reduce wear.
• Function test: Check valve and hydraulic function.
• Protective measures: Use protective caps on couplings.
• Repairs: Promptly fix damage due to corrosion or wear.

They are mainly used in agriculture to flexibly adjust the position and tilt of three-point implements on the rear of tractors. Typical applications include plows, harrows, mulchers, mowers, and other equipment for soil preparation and field maintenance.