Vinten Quattro-OBL, Руководство оператора

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17
Drag control
Column movement is adjustable for drag and this is set according to operator preference by
means of the drag control
(17) located at the base of the moving column. Turn the control clock-
wise to increase the drag setting, and counter- clockwise to decease it.
On-shot clamp
An on-shot clamp (10) , located at the base of the moving column, can be used to hold the column
in position if fixed height operation is required. Move the clamp lever fully to the left to apply the
clamp. Move it fully to the right to release the clamp.
Steering
Directional control of the pedestal is achieved by turning the steering ring (3) mounted at the top
of the column. The steering system is geared so that the wheels turn by the same amount as the
steering ring. This ensures, for example, that with the pedestal set to crab, turning the steering
ring by 90° will also cause the pedestal to change direction by 90°. The steering ring is fitted with
indicators
(5) which, when aligned with the crab/steer pedal (7) , indicates the straight-ahead po-
sition and thus provides a reference point when steering.
The pedestal has a crab/steer arrangement with a foot-operated changeover mechanism, which
provides a steer setting - one wheel steering, two fixed; or a crab setting - all three wheels turning
together. Pushing the pedal
(7) operates the changeover mechanism which toggles the pedestal
between crab and steer.
In position 1 - with the white pedal area hidden - the pedestal is in steer. In position 3 - with the
white pedal area visible - crab is selected.
Although the button can be pressed with the wheels in any position, the changeover will not occur
until the wheels are all facing forward, so the steering ring may have to be turned by up to 180°
before the changeover mechanism engages. This arrangement ensures that the fixed wheels will
always lock in the straight-ahead position when changing from crab to steer.
The standard steering ring has a diameter of 58,9 cm (23.2 in.). A larger steering ring, with a di-
ameter of 74 cm (29.1 in.), is available as an optional extra (see
Changing the steering ring ).
Parking brake
A parking brake is provided on one wheel, operated by a red, foot-operated button (8) , adjacent
to the crab/steer button.
To apply the brake, press down on the button. Press the button again to release the brake.
Cable guards
Height-adjustable cable guards (11) are fitted to the standard 200 mm (7.9 in.) solid rubber wheels
and the optional 160 mm (6.3 in.) solid polymer composite wheels.
WARNING! This brake is intended for use only as a parking brake. Do not
apply the brake while the pedestal is in motion.