A new higher resolution picture of the Lego Technic Excavator has been published on Eurobricks.  The photo was taken from a trade toy catalogue for upcoming toys in 2010.

This image clears up some of the previous confusions about this model but raises more.

First of all the model does use the standard PF Remote control units.  Notice that the right hand level has a red connector on it.  This has led to speculation that it controls some kind of switching unit to convert some of the motor power from one function to another.

The model supposedly has have 4 motors.  By the look of the gears next to the tracks, it looks like the tracks will be powered.  There's also 3 sets of Linear Actuators and the model also rotates.  So that makes 6 "functions" - so how can this be done with only 4 motors?

It's possible that the right hand lever controls one motor connected to some kind of gear box.  In one gear the remaining 3 motors control the left and right tracks, and also the rotation of the model.  In the other gear the 3 motors control the boom, stick and bucket.  By doing this it means that 2 of the motors have to traverse the turntable in the middle - not something that's ever been done in a Lego Technic set before.  The rotation could be powered from either the upper part of the model or the bottom.

By the looks of it the picture is actually a computer generated image rather than a true photo.  Some detail is lacking.  An example of this is the 2 LA's that lift the boom.  If they are really geared in this way one LA will go up, the other will go down.  To work, both LA's would have to be geared from the same side.  The LA's also look longer than they should be - either it's a trick of the image or they're a new part.

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