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Nov 30, 2021

How to get the most wear life out of your rotatable one-piece and two-piece jaw crusher plates

Antti-Pekka Otava
Antti-Pekka Otava
Product Manager, Aggregates Crushing Solutions
Jukka Salovaara
Jukka Salovaara
Business support manager, Aggregate crusher wears
Are you crushing with Metso Outotec one-piece or two-piece jaw crusher plates in your crushing operation? Did you know that you can rotate the jaw plates to extend their wear life, avoid suboptimal chamber shape and get more profit from your operation? This way you can also make your operation more sustainable, as the same jaw plate can be reused before replacing it with a new one.
Image of one-piece and two-piece jaw crusher plates
One-piece and two-piece jaw plates for Nordberg® C Series™ jaw crushers are rotatable.

But how do you know when to rotate the jaw crusher plate and the correct procedure to do this? We will explain here why it is important to rotate the jaw plates, and when the best time to implement the rotation is.

Why it is important to rotate the one-piece and two-piece jaw crusher plates?

When the wearing of the jaw plates is severe, the crusher performance is not ideal, because the empty spaces between the teeth are reduced, encasement happens frequently, and the crushing angle is changed – or in other words, production is not optimal.

This means that a cost-benefit analysis for changing the worn jaw plate should be seriously considered, because at a certain point, the difference in production justifies investing in a new part. Sometimes we have even observed users crushing with cracked and perforated jaw plates, without carrying out the correct control and cost x production analysis.

By rotating the jaw plates, you can get the most wear life out of the wear part before replacement. Reusing the jaw plates also impacts the profit that you can get from your operation. Reusing the same jaw plate not only saves costs but makes your operation more sustainable. The benefit of the procedure is that it allows good work hardening of the manganese jaw dies and helps maintain the best nip angle for maximum throughput. All Metso Outotec one-piece and two-piece jaw crusher plates are rotatable.

When should the jaw crusher plates be rotated?

The ideal situation would be when even wear occurs throughout the jaw plate area, using all the manganese teeth, eliminating the need to execute the “turn,” or change production. However, this is impossible, because there are some areas where we cannot avoid more severe wear than others, mainly because of the crushing movement geometry, such as in the fixed jaw plate lower tip and the central area of the swing jaw plate, so a turn should be carried out to achieve better performance and use.

Here is what to consider when rotating one-piece or two-piece jaws:

Rotating one-piece jaw crusher plates

Fixed jaw plate – use until wear of about 30% occurs in the lower area and make the first turn. Make the second turn when wear from 90% to 100% occurs in this new lower area. Conclude by using the remaining 30% of the life cycle of this extremity.

Movable jaw plate – the same procedure is applied to the movable jaw plate, because although the wear occurs in the central area, it rarely occurs exactly in the middle of the jaw plate.

One-piece jaw plate rotation instruction

Rotating two-piece jaw crusher plates

When it comes to rotating two-piece jaw plates, worn out jaw plates are removed from the bottom of the crushing chamber. Work-hardened upper jaw dies are installed at the bottom of the crushing chamber. New jaw dies are installed at the top of the crushing chamber.

Two-piece jaw plate rotating instruction
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