Abacus Lighting, Sutton-in-Ashfield, Nottinghamshire, NG17 5FT, England. Tel: (+44) 01623 511111, www.abacuslighting.com
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touch. A gap of 10mm should be visible between the lid and base at ‘X’
as illustrated. Hold the
bearing plate in position and retract the ram, maintaining a steady pressure on the control valve.
There may be some slight vibration of the mast shaft at commencement of lowering as the various
pivot and anchor pin clearances reverse, but this will cease very quickly to give a constant smooth
descent.
Once a smooth descent is underway the control valve may be released to stop the mast in any
desired position. When the mast reaches a horizontal position, place a suitable support below the
shaft at approximately 2/3 of the mast height and at an overlap joint.
3.6.
Raising the Mast
Operate the control valve or operate the manual pump such that the ram extends and the hinged
part of the shaft is raised into a vertical position.
ENSURE AS THE RAISING PROGRESSES THAT THE FLEXIBLE CONDUITS DO NOT GET
TRAPPED BETWEEN THE FIXED AND HINGED PARTS OF THE MAST.
Fully extend the ram and wait for any shaft oscillations to decay. Swing the bearing plate through
90º away from the bearing lug and reverse the control valve to retract the ram. Check during
retraction that the hinged part of the shaft fully overlaps the fixed part of the base. A warning label
indicates the correct amount of overlap.
When the shaft has overlapped to the correct amount the ram anchor pins will loosen. Rotate the
bearing plate towards the bearing lug. The projection on the inside of the bearing plate should
locate under the bearing lug. If the bearing plate has a locking screw, align it with the hole and
tighten.
