Vinten Quattro-OBL, Operator'S Manual

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16
Balancing the load
After pressurization of the pedestal, the pan and tilt head and payload can be accurately balanced,
as follows:
Exercise the moving column (6) over its full travel at least twice, then position the column
in the mid-height position.
If the column tends to fall, remove a trim weight (1) , (20) or increase pressure.
If the column tends to rise, reduce the pressure in steps of 0.15-0.20 bar (2-3 psi) using the
Schrader valve cap
(16) .
Refit the Schrader valve cap (16) .
A correctly pressurized pedestal will balance its payload such that it can be moved to any
position over the full on-shot stroke of the moving column, with minimum effort, and it will
maintain its position when the steering ring is released.
Fine balance and temperature correction may be achieved by adding or removing trim
weights.
Using the pedestal
Height adjustment
The column (6) has an on-shot stroke of 100 cm (39.4 in.) and the load can be moved over this
distance, in perfect balance, by raising and lowering the steering ring (3) . The movement is ad-
justable for drag (17) and an on-shot clamp (10) can be used to hold the moving column in position
if fixed height operation is required. A markable height indication scale (19) is provided on the sec-
ond stage of the column. Operators can use this scale to record working heights to be returned to
whilst shooting.
WARNING! A pressure retaining valve prevents pedestal pressure being
reduced below approximately 3.5 bar (50 psi)
WARNING! The Schrader valve cap (16) forms a primary pressure seal.
Always replace the cap and screw it down finger- tight.
WARNING! To ensure maximum stability, particularly when moving over
uneven surfaces, reduce pedestal height to a minimum.
Take care not to trap fingers under the steering hub or between
column elements while pedestal height is being reduced