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5
To check the bearings, turn the balance control as far as possible counter-clockwise, turn the pan and
tilt drag controls fully counter-clockwise and release the brakes. At these settings both pan and tilt axes
should move smoothly and without perceptible drag.
Adjustments
Drag control knob adjustment
Normal conditions
6
The pan and tilt drag controls on the Vision 10LF head operate by expanding a drag shoe with an
actuator. Bedding-in occurs between the actuator and the shoe, which requires resetting of the drag control
knob. This simple adjustment should be performed after one month's service and at six monthly intervals
thereafter.
7
The procedure for resetting the pan and tilt drag control knob is as follows (
Fig 4.1
):
7.1
Release the pan and tilt brakes.
7.2
Prise out the centre of the appropriate drag control knob
(3)
.
7.3
Turn the knob
(1)
fully clockwise to its maximum setting and remove the retaining screw
(2)
.
7.4
Pull off the knob
(1)
, rotate approximately 20 degrees counter-clockwise and refit.
7.5
Turn the knob fully counter clockwise to its minimum setting.
Fig 4.1 Drag Control Knob Adjustment
(1)
(2)
(3)
