For most of our BAV-CB crusher bucket range,the very short answer is; approximately the weight of the carrier excavator, per hour. It can be faster than this in optimum conditions.

For more detail, please read further FAQ notes on output size and feed material.

Other than the smallest two crusher bucket models,the BAV-CB1 & BAV-CB2, buckets have two output grade adjustments.

Grade is adjusted by add or removing a crush grid from the bucket. The grade with the grid fitted is the finest setting:

• Fine setting 0 to 50mm approx.
• Coarse setting 0 to 100mm max.

On the CB1 & CB2 it is only the 0 to 50mm grade available.

It will always take more time and energy to crush to a smaller grade. The finer,smaller output grade will always be slower.

For these types of crusher bucket, the ideal is good, clean, general grade concrete.

Things like driveways, between 100 and 150mm thickness, broken into roughly 300mm x 300mm sections.

Softer material like brick or breezeblock does not crush as cleanly (it crumbles) and is less dense, so it stands to reason the tonne-per-hour rate will be lower.

Very hard concrete or rock will also require more energy to crush
(some rock may even be too hard for the attachment) and hence will be slower. Finally, reinforcing in concrete can significantly slow down the crushing process.

Ideally, bricks, blocks and general grade concrete. Things like driveways, between 100 and 150mm thickness and broken into roughly 300mm x 300mm sections.

In a quarry, a lot of time and effort goes into engineering the blast to deliver optimum sized feed for the crushing plant, even if it's a very large 100+ tonne per hour unit.

For our crusher buckets, chunks which approach the maximum feed thickness or (to a lesser degree) width of the crusher bucket jaw will tend to present more difficulty. Very small items like small paving blocks can also be a bit slower to crush, because they pack out the jaws.

The ideal is middling-sized pieces. Large, awkward-shaped or very hard pieces are generally best left to one side, to crush once the rest of the material has been processed,in order.

Ideally, having a hydraulic hammer or breaker to reduce oversized or very hard pieces will help greatly.

Many of our customers have hared similar stories of badly sorted material.

A typical example would involve them being called in to site to crush “about 200 tonnes of rubble” and arriving to find roughly 100 tonnes of good, crushable feed material, mixed in with roughly 100 tonnes of soil, dirt or fines.

This is not ideal. As far as possible, in order to maximise performance, feed material should be clean of dirt and fines and dry - an attachment such as our BAV-RS screening buckets can help.

This part is very simple. Always run on 2-way circuit not hammer circuit.

Flow: The attachments are designed to be able to take the maximum flow of their respective carrier excavator class. the more flow, the faster the jaw moves.

Pressure: The attachments are designed to be able to take the maximum pressure of their respective carrier excavator class. ensure your machine's circuits have not been re-set or de-rated. This will lead to poor performance.

On older machines, check the condition of hydraulic oil and also the pressure and flow performance of the pumps. Other digging functions can still work, even when pumps are worn out.

Firstly and most importantly, grease all pivot points, every day. Use good quality, high load Lithium complex grease.

All carbide tips should be sharp for optimum penetration and efficiency. Check and replace badly chipped or blunt items as necessary. This would usually only be 5 or 6 per year.

All pivot points are fully bushed, with oversized pins. With regular greasing, they should all last for at least 3 to 4 years without any replacements required.