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It is vitally important that each roller is at exactly the same distance away from the tyre.
The whole assembly must be parallel to the trailer axle.
Slide the motor units in or out of the cross bar (3) accordingly to ensure the roller will have
the maximum possible contact with the tread of the tire. Ensure that the position of each
motor unit does not obstruct shock absorbers (if fitted) and that the plastic gear cover
(Fig.4F) is not too close to the surface of the tire. The minimum clearance when the drive
units swivelled in is 10 mm.
Fully tighten the four bolts (Fig.1B) on the Main Cross Bar (3) and the four bolts (Fig.1C) on Cross Actuation
assembly (4 & 5).
Fully tighten all the nylon nuts (21 & 25) on both clamping assemblies (Fig.2 & Fig.6). Tighten the M10x40 bolts
to a 40Nm torque.
Re-check the distance of 20mm (3/4”) from the rollers to the tires, the position of the aluminium rollers in
addition to the surface of the tire and finally the distance between the gear cover (Fig.8) and the tires & shock
absorbers (>10mm). If necessary, loosen the bolts and re-adjust the position of the assembly. The weight of
the trailer must be on the wheels when doing this.
Fix the Chassis Stop Blocks(7) next to the mounting brackets. Fix the bolts with a 40Nm torque, and then fix
the nut with a 40Nm torque to keep the bolts on position.
Re-check that all bolts/nuts have been tightened to the correct torque!
The main mechanical components have now been installed.
Installation - Electrical/Electronic Components
Make sure the 12V supply from the battery and any mains electricity supply are
disconnected.
Remove battery cable terminals and disconnect any external electrical power before starting work.
Find a suitable place for the Electronic Control Unit (41), such as a storage area, under a seat or a bed. Make
sure this place is dry. The unit can be mounted on the bottom (horizontal) or on the wall (vertical). When
choosing location, ensure that the antenna can be completely extended and cannot easily be damaged.
Fix the Electronic Control Unit securely into position with four screws (31). Note: if the provided screws are not
of suitable length or type for the desired location/material please substitute these as appropriate.
Drill a 1” hole through the floor of the trailer approximately 5” or 6” away from the front of the control unit (41)
terminals. Caution! Take extra care to avoid any chassis members, gas pipes and electrical wires!
Route and connect the motor-cables in accordance with wiring diagram (Fig.12) (red = positive, black =
negative).
The wiring diagram (Fig.12 + Table.A (see below)) depicts the wiring route when installing the motor units in
front of the wheels/axle towards the ‘A’ frame. Please refer to table B (below) for fitment of the motor units to
the rear of the axle.
Table . A
FRONT OF AXLE FITTING
Motor A Positive (+) cable to terminal 3
Motor A Negative (-) cable to terminal 4
Motor B Positive (+) cable to terminal 1
Motor B Negative (-) cable to terminal 2
Table . B
REAR OF AXLE FITTING
Motor A Positive (+) cable to terminal 2
Motor A Negative (-) cable to terminal 1
Motor B Positive (+) cable to terminal 4
Motor B Negative (-) cable to terminal 3
Mark the Motor Cables (14 & 15) for both motor units using the cable markers (34). The cables for the left and
the right motor should have the same length. Avoid any loops.
Connect the spade connectors (30) to the motors. Please note that the red cable is connected to the terminal
under the moulded ‘+’ symbol on the weatherproof terminal cover.
