Adjusting Spring Tension - B&D Roll-A-Door 2 Series Installation Instructions Manual

Roll-A-Door Series 2 installation instructions
®

2.9 adjusting spring tension

2.9.1 hand operated and direct drive doors only
WARNING! Ensure that pipe wrench is fitted correctly to the
axle and if it is gripped onto the axle do not underestimate
the tension in the spring when undoing the clamps
CAUTION: THIS ADJUSTMENT REQUIRES 2 PERSONS TO
COMPLETE.
a) With the door rolled up tie two ropes around the door
roll approximately 300mm from each end, as a safety
precaution.
b) With a person at each end of the door, hold the axle firmly
with a large pipe wrench (Stillson) at least 450mm long.
c) Loosen the "U" bolt nuts at both ends and KEEP A FIRM
GRIP ON WRENCH.
d) Rotate the axle in the required direction (Fig 2.9.1).
e) Re-tighten the "U" bolts to a tension of 40 Newton metres or
30 ft.lbs BEFORE releasing pipe wrench.
f) Test and repeat if further adjustment is necessary.
TO LOOSEN
SPRING TENSION
.
"U" BOLT TO BE LOOSENED
WITHOUT COMPLETELY
REMOVING NUT WHILE
HOLDING ONTO THE AXLE
WITH A PIPE WRENCH
15
TO TIGHTEN
SPRING TENSION
Fig: 2.9.1