12
Installing the rack.
Rack to pinion spacing.
Correct.
The driving surfaces of each tooth are 1 to 2mm
apart. Allowing for slight variance in the height
of the rack when the wheels shrink in colder
condi ons or where the gate fl exes and the rack
is no longer square to the pinion.
Incorrect!
This will cause skipping of teeth at the slightest
resistance to the gate travel, resul ng in the
motor control going out of synchroniza on to
the gate posi on. The long term damage here
will be stripped teeth.
Incorrect!
This will cause unwanted rolling resistance
especially in colder condi ons. Where the wheel
shrinkage will cause the gate to sit heavier on
the pinion or when the rack is no longer square
to the pinion due to gate fl ex. (False safety
sensing ac va on)
The following shows a simple method of installing a rack that ensures you achieve the correct fi t between the rack and pinion.
•
Clamp the end of the fi rst length of rack’s end to the closing edge of the gate.
•
Rest the other end of the length on the pinion as shown here.
•
Use a spirit level to ensure the rack remains true.
•
If sa sfi ed with the rack level fasten the fi rst “TEK” screw (supplied) in
the middle of the slot nearest the closing edge of the gate.
