Two Theories for Extendible Dipper Sticks
There are two distinct ways to to extend backhoe reach, with pros and cons on both sides of it.
According to Wright, “Inner dippers do not allow the plumbing to move with the extendable portion of the dipper, where the outer extendible dippers carry the auxiliary hydraulics to travel with the extendible dipper. This allows attachments like thumbs to be used at full extension.”
Caterpillar's Kevin Hershberger touts two specific advantages of the Cat outer slide design: it eases serviceability and it allows installation of the Caterpillar hydraulic thumb. “With this design, the wear pad system can be adjusted in the field, using common hand tools, and the hydraulic thumb can be used through the full extension range of the E-Stick," he says.
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