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4 Installation
4.1 Cylinder
4.1.1 General
Avoid weld and paint splashes or other damage to the piston
rod during assembly. This damage could effect the oil seal ring,
creating oil leaks.
The cylinder air bleed nipples should point upwards to ensure
effective bleeding.
Fit one cylinder foot to the hatch and the other to a suitably
strong foundation, this should be strong enough to accommo-
date the push and pull forces generated during raising and low-
ering.
Install the cylinder in a dry, well-ventilated space.
If this is not possible, take provisions to protect the cylinder
from damp, dirt and seawater.
4.1.2 Layout
The following assumptions apply to all the situations in this
paragraph:
• The open angle of the hatch is 90° when the piston is at the
end of its stroke (500 mm stroke).
• Piston 'in' is at right angle to the hatch.
• The fork pivot (B) and hatch hinge point (A) lie along a hori-
zontal line AB.
On the basis of this, the cylinder should be fitted at a horizontal
distance of 418 mm. from the centre of the hatch hinge point.
If the situation is different, you will have to make the calculations
yourself.
However, it should be noted beforehand that:
• When the pivot point B is above the centreline AB, the open-
ing angle will be greater than 90°.
• When pivot point B is below the centreline AB, the opening
angle will be less than 90°.
8
6.0901
When installing, ensure that the cylinder hatch hinge and cylin-
der can never clash!
4.1.3 Calculation
G x W [kgf]
Formula: F =
837
G = Weight of object to be lifted [kg]
W = Width of object to be lifted [mm]
F = Lifting force required [kgf]
The lifting capacity of the cylinder is 125 kgf.
When the pivot point B is above or below the centreline AB, this
calculation will not apply. However the calculation can be used
to provide an approximation of the lifting power required.
Example:
A hatch weighing 80 kg and 1200 mm wide.
Lifting force required:
F = G x W = 80 x 1200 = 115 kgf.
837
837
In this case, only one cylinder is required (model '125 kgf').
4.2 Electro-hydraulic Pump (EHP)
The space in which the EHP is installed must be dry and well-
ventilated.
Place the EHP as close to the cylinder as possible.
When choosing the position and the mode of installation, take
into account the noise and vibration created by the EHP .
The EHP is fitted with rubber vibration dampers.
The foot of the
EHP should be fit-
ted on a horizon-
tal surface.
The filler cap for the balance pipe* should always be on top, at
the highest point.
* A filler cap with air hole or the connection for the balance
pipe should be fitted to the EHP .
Electro-hydraulic lifting system
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