Detecting and Replacing Worn Link Pins on Reversible Ploughs

The link pins that connect the plough frame to the tractor linkage and to its own pivot points are simple parts, but they carry every shock the plough meets. Pins wear slowly, and the play they create shows up as looseness, vibration and uneven body loading. Catching worn pins early prevents the secondary damage that play causes across the whole frame.

Feel the play at every joint

With the tractor off and the plough lowered, grab each linkage point and try to move it by hand. Any visible side-to-side movement means the pin, the bush or both are worn. Check the lower link pins, top link connection, and the pivot points for the reversal mechanism. A joint that felt tight last season but now moves is due for attention.

Look for oval wear on the pin

Remove a suspect pin and roll it on a flat surface. A worn pin shows an oval or flattened section, where it has ground against the bush over thousands of cycles. Surface rust is normal, but a visibly reduced section or a groove along the pin means replacement. Do not reuse a worn pin, because it will wear the new bush quickly.

Replace pins and bushes as a set

When a pin is worn, the bush inside the bracket is usually worn too. Fit a new pin together with a new bush, and check that the pin slides through with a clean fit but no excess shake. Mixed old and new parts leave play somewhere in the joint. Keep a small kit of common pin and bush sizes on the shelf for the plough.

Grease and inspect regularly

Pins wear fastest without lubrication. Grease every pin nipple on schedule, and clean away old grease and dirt from the joint. A freshly greased joint moves smoothly and sheds water. At the start of each season, re-check every pin for play, and after any hard impact with a stone, inspect the nearby pins for bending.

A tight plough works longer

Pins may be cheap, but the damage caused by play is not: a loose frame shakes the bodies, fatigues welds and accelerates share wear. Replacing pins and bushes on time keeps the whole plough tight. A tight plough runs quieter, turns cleaner and reaches the next service interval without unexpected repairs.

References

PATEL N, CHEN L. Wear of linkage pins on reversible ploughs[J]. Biosystems Engineering, 2020, 196: 190-198.

Patel, N., and L. Chen. "Wear of Linkage Pins on Reversible Ploughs." Biosystems Engineering, vol. 196, 2020, pp. 190-198.

Patel, N., & Chen, L. (2020). Wear of linkage pins on reversible ploughs. Biosystems Engineering, 196, 190-198.