Abacus Lighting, Sutton-in-Ashfield, Nottinghamshire, NG17 5FT, England. Tel: (+44) 01623 511111, www.abacuslighting.com
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towards the mast whilst simultaneously releasing the ram support/lifter bracket from the
lower location bracket on the motor/pump body.
The ram is finely balanced at this position and must therefore be supported against the
column by hand to prevent it being accidentally toppled backwards.
Extend the ram until the upper end is aligned with the upper ram anchor gusset. Insert the
pin and secure with its retaining pin.
3.5.
Lowering the Mast
DO NOT ATTEMPT TO LOWER THE MAST IF THE WIND SPEED IS 30KPH (18MPH) OR
GREATER.
If the bearing plate has a locking screw, withdraw it using the door key sufficient distance to allow
the bearing plate to rotate. Turn the bearing plate through 90º so that the projection on the inside
of the bearing plate clears the fixed lug. The relative positions of the pivot bearing plates for the
various stages of the lowering and raising operation are shown in the operating sequence
diagrams at the end of this section and reference should be made to this throughout.
Operate the control valve or operate the manual pump to extend the hydraulic ram. As the ram
extends, the hinged part of the mast will be observed lifting relative to the fixed part of the base.
Continue to lift until the pivot reaches the limit of its travel. Rotate the bearing plate towards the
bearing lug as far as it will go. The bearing lug and projection inside the bearing plate should
