8
Assembly
Note:
The Tube/Chain Speed Unit Assembly with Trolley and Front Idler Sprocket is packaged separately from the
Power Head Unit. Refer to Page 7 for package contents and identification
.
Step 1.
Place Power Head Unit on discarded packing material/
cardboard.
Step 2.
Remove the sprocket cover, see figure 7A, and position
the trolley on the drive tube as illustrated figure 7B.
Step 3.
Roll out the chain assembly carefully to prevent tangling.
Connect the trolley release rod to the connecting link
through the drive trolley, but do not tighten. (Figure 7C)
Wrap the chain around the drive sprockets on the drive
unit ensuring the chain engages the teeth on the sprocket.
Extend the chain along the other side of the tube and
around the return pulley.
Ensure the trolley has not moved from the point as
indicated in the diagram (Figure 7B).
Now install the connecting link to the trolley release rod as
illustrated. (Figure 7C).
Note: during the assembly the trolley release rod is
actually engaged in the trolley. It is shown here removed
for the sake of clarity.
Step 4.
Tension the chain by turning the adjusting nut. Hold the
trolley release rod and the connecting link to prevent from
turning. (Figure 7C).
The tension should be correct when the chain has a sag of
between 6 mm and 12 mm (Figure 7D).
Tighten lock nut against the connecting link, to lock
adjustment into place (Figure 7C)
Note:
The chain and its supporting equipment may stretch after a
period of time. The chain should be re-tightened after the
first three months’ use, and thereafter as required.
Step 5.
Re-check all nuts for tightness
.
Assembly is now completed. You are ready to begin installation of the opener.
Figure 7A
Figure 7B
Safety Spacer
Figure 7C
Lock
Nut
Trolley
Trolley
Release
Rod
Connecting
Link
Figure 7D
Centre of Chain
6 mm to 12 mm
Centre of Tube
