RXT-G ACP BackTracker Steering system
Updated: 2012.03
2001 RXT-G - ACP LongRanger III
The LongRanger III is
equipped with AC
BackTracker steering
Propulsion’s  system.  
This system is
designed to keep the
the tow vehicle whether
the vehicle is moving
forward or backward.  
The trailer hitch and
ball each hold sensors
that determine the
trailer’s angle to the
vehicle. The wheels
also hold  sensors that
determine the trailer’s
speed and direction
(forward or reverse).  
Between these
systems a PCB
controls the directional
inputs to a servo motor
which adjusts the
wheel pitch based on
inputs.  There is no
software involved in
the system.

The following pictures
show examples of each
of the components of the
BackTracker steering
system.
The PCB and various
pots to refine and
adjust the steering
system.
The htich ball.  Note
the machining to
accomidate the ball
sensor four (4) pictures
below.
Note the Blue cover on
the hitch assembly.  It
houses the
corresponding sensor
that reads the hitch
angle from the ball's
angle.
Here are the wheel
sensors.  One reports
speed and the other
reports direction back
to the PCB.
The following set of
pictures show the rack
and pinion (worm
gear) assembly.  This
assembly also holds
gears.
The servo motor has a
white support rim
where a cap mounts to
ensure water tight
operations.
This is the interior of
the servo motor gear
housing.
The internals of the
rack and worm gear /
ball bearing system
are shown here.  This
lateral pressure off the
servo motor and
allows smooth
controled operations.
The next two pictures
show the BackTracker
steering in operation.  
Note as the vehicle  
front wheels of the
vehicle turn to the
directly behind the
vehicle.
Note the two (2) lag
bolts and lock nuts
under the 2x2"
reciever.  We added
these to eliminate all
motion from the hitch
coupling system.  
This ensures that the
hitch & ball remain
rigid to the vehicle's
frame at all times.  
With this modification
the trailer is perfectly
quiet behind the
vehicle and the
steering geometry
reads the precise
angle of the trailer.
A short video from AC
their RXT-G backing
up on the tzero.  Note
how the BackTacker
steering system the
trailer directly behind
the vehicle.