Unihoist Ltd Graduate 150, Instruction Manual

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8. Raising and lowering the boom (hydraulic models). The raising and
lowering of the boom is achieved by a powerful hydraulic ram which is
operated by two simple controls. The release valve, which is identified by an
aluminium knurled knob, and the pump handle which is a long lever on the
side of the hydraulic unit.
To raise the boom, ensure the release valve is closed. The valve is closed by
gently turning the knurled knob fully clockwise. When closed, pump the
handle with smooth even strokes for maximum effect. The handle strokes
from an upright position through an arc of 90˚. Leave the handle in the upright
position when not in use.
DO NOT force the handle beyond the upper or
lower stops. The hydraulic unit can be rotated to allow the handle to be used
from either side of the lift.
To lower the boom, turn the release valve anticlockwise. The release valve is
progressive, the more it is opened the faster the descent. This facility allows
for a "hands free" descent. If the release valve is opened a fraction (a quarter
turn) a very slow speed of descent will allow the carer to work "hands free"
while assisting or comforting the patient.
REMEMBER to close the release valve before commencing lifting operations.
The release valve only requires gentle pressure to open or close.
DO NOT apply excessive force to the release valve, either to open or close.
It is not necessary and will only damage the valve.
9. Slings. The selected sling is attached to the spreader bar hooks, each sling
is supplied with instructions and they are reproduced in this manual. The
instructions should be followed carefully.
Operating a Unihoist Lift contd.
SF25 Iss.5 July 2012