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INSTALLATION (continued)
STEP EIGHT:
Locate chain at Drive unit end onto drive unit sprocket. Keeping chain taut on sprocket, insert drive unit chassis
onto rail and slide forward until the chassis upright hits end of rail (see fi gs 7a & 7b).
STEP NINE:
Install Idler bracket inside door end of rail. Keeping door end of chain taut inside Idler Wheel, fi t M8 nyloc nut as
shown in fi g 8.
STEP TEN:
Tension the chain by tightening the M8 nyloc nut. The tension is correct when the center of the chain is clear of the
rail by 5mm. Check chain tension after initial installation and thereafter as required. The tension can be adjusted
after installation, but only while the chain is not moving.
IMPORTANT - DO NOT OVERTIGHTEN CHAIN
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