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On the other hand, it's important to take notice of which coupler you're using. Depending on the type, it can change the geometry of the machine and reduce its breakout force.

A dedicated coupler, which is integral to the machine, has minimal affect since it maintains the highest possible digging power. "In this scenario, virtually no other aspects come into bucket selection because the tip radius of the bucket and the machine remains the same," says Cveykus. "The breakout force, bucket rotation, etc., of the machine all remain virtually the same as the OEM specifications."

Adding a hydraulic pin grabber coupler, on the other hand, could move the bucket farther away from the machine, adding to the tip radius. "That could reduce the breakout force, depending on the bucket and machine configuration," says Gabriel.

Tip radius measurement affects the bucket curling force. A bucket with a short tip radius provides more curling force than one with a longer tip radius, facilitating easier loading of material.

Your bucket manufacturer can help you calculate the affect a coupler may have on the breakout force of your machine. "You certainly want to account for it so you don't tip the machine," says Yoresen. "You need to be aware that there will be a reduction in breakout force because you're changing the geometry of the machine relative to the bucket. When you change the geometry — the relationship of the bucket arm to the tip of the bucket — it affects the available machine power."