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GENERAL INSTALLATION
FITTING THE CONTROL HEAD
The 8825-‐R4 kit includes an anti-‐rotation torque
arm; it is possible to mount the Control Head
inboard or outboard the bearing plates and
horizontally or vertically so long as the torque
arm is at right angles to the operator. This stops
the operator moving from side to side when the
door is moving (Pic 4).
Pic 4
Slide the Control Head onto the jackshaft and
select a hole on the bearing plate or door frame
for the torque arm. If no hole is available then
drill a 1/4” hole in a suitable location.
Bolt the torque arm to the bearing plate or door
frame and secure the other end to the torque
arm fixing hole on the Control Head, use the
supplied spacer if the offset is not enough to
clear the drum (Pic 5).
Pic 5
Align the Control Head driven pulley’s keyway
with the door shaft keyway and fit the supplied
key. Ensure that the Allen screws are firmly
tight and then tighten the lock nuts (Pic 6).
Pic 6
If there is no keyway, the hollow door shaft
should be drilled. Tighten one Allen screw to
mark the shaft through the screw hole, remove
the Control Head and drill through one wall of
the shaft with a 1/4” drill bit. Replace the
keyway Allen screw with the long Allen screw
supplied. Refit the Control Head and re-‐tighten
the torque arm bolts. Align the long screw with
the drilled hole in the shaft and tighten it against
the inside wall of the shaft. Tighten the other
Allen screw and both of the lock nuts (Pic 7).
Pic 7
Summary of Contents for 8825-R4
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