Choose the right top link for your tractor

Quick answer: which top link should I choose?

Choose a top link based on the tractor's three-point linkage, the implement's attachment and the right category. Check the pin diameter, the ball dimensions and that the top link has the right length and adjustment range. A hydraulic top link also requires a double-acting hydraulic outlet on the tractor. If needed, add the right implement pin, linch pin and bushings for secure mounting without play.

A top link is used to adjust the angle of the implement behind the tractor. The right top link makes the implement more stable, easier to set up and safer to use.

How to choose the right top link – step by step

The ball diameter determines whether the implement fits in the lift arms. Measure if you are unsure.

The ends of the top link must fit both the tractor's and the implement's upper attachment point. The most common designs are:

• Ball joint at both ends – attached with a pin and linch pin on both the tractor and the implement. Suits most three-point implements.
• Clevis – a fork-shaped end that is attached around the tractor's mounting point with a pin.
• Catch hook – a hook-shaped end towards the implement that lets you hook on the implement from the driver's seat.

A catch hook is particularly practical on hydraulic top links, as you can adjust the length and hitch the implement without leaving the cab.

The top link must be adjustable to give the correct working angle. How you measure depends on whether the top link is mechanical or hydraulic.

Mechanical top link:

• Measure the old top link fully screwed in and fully screwed out
• Check the distance between the tractor's and the implement's upper attachment points
• Make sure the threads have sufficient engagement even when fully screwed out

Hydraulic top link:

• Measure your current top link between the centres of the mounting holes when the implement is in its normal working position
• Compare with the installation length of the hydraulic top link – that is, its length when fully retracted
• Check that the stroke is long enough to reach the length you need when fully extended

A hydraulic top link is controlled with two hoses – one to extend and one to retract – and therefore requires a double-acting hydraulic outlet on the tractor.

• Check that the tractor has a free double-acting outlet
• Check which type of quick couplers the tractor has
• Check whether hoses are included or need to be bought separately, and that they are long enough to reach from the outlet to the top link

A top link with a pilot-operated check valve holds the set length even under load, so that the implement does not change angle during work.

If the implement and the tractor do not have exactly the same dimension, a bushing kit is required.

• The implement has a larger hole than the tractor's pin
• You are connecting implements from different categories
• You want to reduce play and wear

To lock the top link and implement in place, the right bolt and pin are needed.

• The bolt must have the right diameter and length
• The pin must lock securely – replace worn pins
• Old and bent pins should always be replaced

Common mistakes to avoid

Choosing based on tractor model alone

The tractor model gives you guidance, but the implement's attachment can differ. Always measure the pin diameter and the length.

Missing the difference between top link and lower link

Top links and lower links have different dimensions. A dimension that applies to the lower link does not automatically apply to the top link.

Not checking the adjustment length

The top link does not just have to fit at the ends. It must also be adjustable to the correct working angle. On a hydraulic top link, the installation length and stroke determine how much you can adjust.

Forgetting the hoses

Hydraulic top links are often supplied without hoses. Check whether you need to buy a hose kit, and that the couplers fit the tractor's outlets.

Reusing worn linch pins

Old linch pins can be bent, worn or too loose. It is better to replace them with new locking parts when needed.

Checklist before buying

Category checked

Determines pin and ball dimensions

Pin diameter measured

Ensures the right fit

End fittings checked

Ball joint, clevis or catch hook

Min and max length checked

Provides sufficient adjustment range

Implement attachment checked

Must fit the ends of the top link

Hydraulic outlets and hoses checked

Applies to hydraulic top links

Need for bushings checked

Reduces play with different dimensions

Pin and linch pin checked

Required for secure locking

FAQ / Frequently asked questions about tractor top links

How do I know which category my top link is?

Measure the pin diameter. A category 1 top link normally has a pin diameter of approximately 19 mm, category 2 approximately 25 mm, category 3 approximately 32 mm and category 4 approximately 45 mm.

Can I use a top link of the wrong category?

It is not recommended without the right adaptation. The wrong category can cause play, poor fit or unsafe mounting. In some cases bushings can be used, but the dimensions must be checked carefully.

What does a bushing kit do?

A bushing kit reduces the hole diameter so that the pin and the attachment fit together better. This reduces play and makes the connection more stable.

When should I replace my top link?

Replace the top link if it is bent, has damaged threads, has a lot of play, is difficult to adjust or no longer holds the implement in the correct position. On a hydraulic top link, oil leaks at the cylinder or couplings are also a sign that it needs attention.

Do I need to replace the implement pin and linch pin at the same time?

It is often wise to check them at the same time. If the pin is worn or the linch pin does not lock properly, they should be replaced to ensure secure mounting.

How do I find a top link for my tractor?

First choose your tractor make and then your model. You will then see the spare parts that fit your specific tractor.

What is the difference between a mechanical and a hydraulic top link?

A mechanical top link is adjusted by hand by screwing it longer or shorter. A hydraulic top link is adjusted using the tractor's hydraulics, so you can change the angle of the implement directly from the driver's seat.

What do I need to use a hydraulic top link?

The tractor needs a double-acting hydraulic outlet. You also need hoses with quick couplers that fit the tractor's outlets, if they are not included with the top link.

How do I measure for a hydraulic top link?

Measure your current top link between the centres of the mounting holes in its normal working position. Then choose a hydraulic top link whose installation length and stroke cover that length, with a margin in both directions.