Vinten Quattro SL Operating Instructions Manual page 19

English
Set the pedestal to CRAB and carefully align the clutch wheels (under the crab/steer knob) and
one of the front wheels with the line on the studio floor.
Push the pedestal 3.6 m (12 feet) along the line. The pedestal should not deviate more than 50 mm
(2 in.) from the line.
Push the pedestal back to the starting point. The pedestal should not deviate more than 50 mm
(2 in.) from the line.
Reposition the pedestal to align the wheels under the crab knob and the other front wheels with
the line on the studio floor and repeat the above check.
If the deviation exceeds the above limits, re-align the wheels as follows:
Remove any payload from the pedestal. Remove all trim weights from the weight tray and
stowages.
Lower the column and lock in the fully depressed position.
With the aid of a second person, invert the pedestal and stand it on the weight tray. Use a suitable
material under the pedestal to prevent damage.
Turn the cable guard adjustment knob (10) so that the indicator (11) is at the top of its scale, to set
the cable guard to its highest position.
Select STEER and turn the wheels until the two wheels furthest from the clutch wheel lock in the
straight-ahead position.
Working through the lifting apertures (9), at each axle mounting, slacken the lock screws (9.1).
Push a substantial straight edge (at least 1 m (3 ft) long) against the tyres of the two pairs of wheels
until the wheels are aligned. Tighten the lock screws (9.1).
Select CRAB and turn the wheels until all wheels lock together.
Turn the wheels until the clutch wheel is approximately aligned with either of the other wheels.
Slacken the lock screw (9.1) on the clutch wheel.
Push the straight edge against the tyres of the clutch wheel and the other wheel until they are
aligned. Tighten the lock screw (9.1) on the clutch wheel.
Check the alignment of the clutch wheel against the second wheel, then recheck the alignment of
the two wheels furthest from the clutch wheel. Repeat the adjustment until alignment is
satisfactory.
Ensure all lock screws (9.1) are fully tightened.
With the aid of a second person, turn the pedestal upright.
Carry out a tracking check as detailed above.
If problems are still experienced with the steering, it is probably due to backlash in the steering ring, or
slackness in the steering belt or chains. Please refer to the appropriate section in the Maintenance Manual.
18