2.9 adjusting spring tension
PULL
To loosen
spring tension
CAUTION: The correct adjustment will only be found by trial and error, adjustments should
be retricted to approximately one revolution of the chain wheel.
2.9.1 hand operated and direct drive doors only
2.9.2 doors with planetary geared chain wheels only
Fig: 2.9.1
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.
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.
chain
clip
chain
wheel
If the door tension needs adjusting and the door is fitted with
Planetary Gearing then follow the steps below:
a) Ensure that the door is in the OPEN position.
b) With the door rolled up tie a rope around the centre of
the door roll and use vice grips to clamp the guides just
under the bottom rail of the door to prevent the door from
closing suddenly during the re-tensioning process, as a
safety precaution.
c) Secure both chains in the chain clip
(Fig 2.9.2)
.
d) Carefully loosen the “U” bolt nuts at both ends.
e) Adjusting tension -
1. To increase spring tension, carefully pull down on the
rear chain, whilst chain is in the chain clip.
2. To reduce spring tension, hold the rear chain firmly,
carefully release chain from the chain clips and allow
the rear chain to move upwards. Take care that the full
tension is not removed from the springs. Lock the chain
in the chain clip.
f) When the tension is correct, secure the chain in the chain
clip and re-tighten the “U” bolt nuts to a tension of 40
Newton metres or 30 ft.lbs.
g) Release rope from door and remove vice grips from guides.
WARNING! As a safety precaution to protect both the door and the installer, lock a section of
the chain in the chain clip at all times so that the chain is restricted to short movements
.
Fig: 2.9.2
14
Roll-A-Door
®
Series 2 installation instructions
