There is an optimum time to change your cone liners. Too soon and you don’t get the value for the cost of the liner, too late and you suffer from significant production losses.
It is our experience that too many people lean towards too late, the optimum time to change a liner really depends on how much money you are prepared to lose to production losses to get the maximum use out of a wear component.
The first condition that is optimum is that the liner change happens when you planned it. This gives you the opportunity to have all of the required parts on-hand before starting. This also allows you to perform other maintenance work on other equipment when the change is being conducted. These days it’s tough to get screen media and manganese on a moment’s notice and you will need to plan things if you need to rent a crane.
The second condition is changing the liner before you start to suffer significant production losses. On top adjust/screw adjust cones this is especially true as the feed size starts to shrink pretty dramatically as soon as you get to the last 1/3 of life and as you near the end the feed size can get very small, losing as much 30% of feed size. This is less of an issue with hydrocodones as the feed size remains constant throughout the life of the manganese.
Having certain materials available at the processing plant can minimize equipment downtime when replacing the wear liners. These materials include:
- A) Mantle – also known as headliner.
- B) Cutting ring – the cutting ring is not reusable, so a new ring should be installed every time the mantle is replaced.
- C) Bowl liner
- D) Padding material – its purpose is to cushion (shock absorption), not to fasten the liners. Lubrication of the head/bowl is recommended to facilitate subsequent replacement.
- E) Cone feed plate – also known as the feed cone; it should be replaced every time the mantle is replaced.
- F) Hex (hexagonal) head bolt – replace only if necessary.
- G) Mantle locking bolt – replacement of this bolt is not necessary with every replacement of the mantle, but a new locking bolt should be kept on hand at the worksite just in case it needs to be replaced.
- H) Set of square-head bolts – replacement of this/these bolt(s) is not necessary with every replacement of lining materials, but it is important to always have a set available at the worksite.
Other wear parts that should be inspected whenever liners are replaced:
- Main frame liner
- Counterweight liner
- Countershaft guard
- Frame arm guard
For additional details regarding the replacement of the mantle and bowl liner, please refer to your equipment’s instruction manual.