I specifically chose not to use pneumatics, to make the model totally free with no
hoses connecting the model to the remote (as with my previous Backhoe Loader). Since
the power functions-system only has 8 channels, I had to include a remote-controlled
gearbox that swithes functions of 2 motors to achieve 9 funtions (5 + 2x2). Besides
the motorized functions, it has a pendular front-axle and PF-lights on front and
The Power-Puller wheels were the largest wheels I have (and exist as far as I know
of), so they were te obvious choice for the rear wheels. These wheels are too wide,
resulting in a model which is too wide and a central chassis of only 9 stude wide.
There was very limited space inside the body to put in all the functions. The batterybox
was placed under the hood, and as much motors were places outside the chassis as
much as possible. 2 motors are inside the backhoe and 2 other motors were placed
at the sides. The model turned out quite heavy, too heavy for the wheels, but driving
The gearbox switches functions of 2 motors. The red lever on the remote switches
between operation of the front loader and the backhoe. This way, operating the model
is quite intuitive. I used Jason Railton thumbstick to operate the backhoe & the
loader. It was combined with the steering wheel I designed for my small racecars.
Moving up and down the backhoe turnded out quite slow. I had to use an M-motor inside
the chassis, there was no place for an XL-motor anymore. The driveshaft goes through
the gearbox and through the turntable. The weight of the backhoe caused quite some
friction, so some gear reduction was neccesary to prevent overloading the M-motor.