c) Lift door up slightly, ease sideways to clear bottom bracket and withdraw from top hinge
pin.
3.21 DOOR LINKAGE SPROCKET
a) Remove door. (See Section 3.20)
b) Slacken turnbuckles to allow chain to be slipped from sprocket.
c) Push out roll pin which holds sprocket upon lower hinge pin. Push out roll pin holding
door switch cam if RH sprocket is being removed.
d) Pull up lower hinge pin and remove sprocket.
e) Replace in reverse order. Refer to door linkage adjustment section for alignment and
tensioning of components.
3.22 DOOR LINKAGE CHAIN and ROD
a) Remove bottom front panel. (See Section 3.5)
b) Slacken turnbuckle to remove tension from chains.
c) Remove spring clip from link which joins chain to turnbuckle. Push out joining link and
withdraw chain rod assembly.
d) Replace in reverse order, referring to door linkage adjustment section, door linkage
alignment section and Figures 2 and 3.
3.23 DOOR LINKAGE ADJUSTMENT and TENSIONING
Due to operational stretching of components or removal for maintenance, occasions will
arise when the door linkage mechanism will require adjustment.
The method to use is as follows:-
Push door handle until RH door makes contact with seal. The LH door should now be 12 to
15mm proud of the RH door at vertical join.(see Figure 2) If LH door is less than this
dimension, slacken both turnbuckle locknuts and rotate LH turnbuckle toward chain and the
right turnbuckle away from chain by the same amount.
Repeat procedure until desired dimension is achieved. If LH door is greater than desired
setting then above procedure should be carried out in reverse.
After doors are synchronised, the linkage should be put under tension by slightly twisting the
turnbuckles toward one other by the same small amount.
The tension should be such that no free play is available between chains and their
sprockets.
