Maintenance manual
KONGSBERG PROPRIETARY.
This document and its accompanying elements contain KONGSBERG
information which is proprietary and confidential. Any disclosure, copying, distribution or use is prohibited if not
otherwise explicitly agreed with KONGSBERG in writing. Any authorized reproduction, in whole or in part, must
include this legend. ©2020 KONGSBERG - All rights reserved.
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5.
Steering gear actuator
The function of the hydro-mechanical steering gear unit is to provide the rotational power to operate
the rudder unit. The steering gear has a compact and unique design with cylindrical rudderstock.
The vanes/pistons work in a spherical shaped rotor with the rudder stock as the centre. The vane/pistons
are fastened to the rotor in a manner; which allows them to absorb and adjust to the spherical deflection
of the rotor due to misalignment in installation or deflection of the rudder stock.
The housing has a cast spherical shape with oil channels leading the oil to the different chambers. The
housing is divided with an upper and lower part which are connected by several bolts.
The synthetic bearing pads maintain hundred percent surface contact at all times, even as the rudder
stock flexes. It will also absorb and suppress vibrations and shock pulses. The bearing surface is
continuously lubricated by the hydraulic oil.
Note!
In order to access the lower seals and bearing pads the rotor will need to be lifted up, prior to this operation
the rudder unit will need to be blocked and secured, and lifting gear made available.
Kongsberg Maritime is not responsible for the securing of the rudder. It is the customer responsibility to engage
a yard or a suitable third party to undertake this task. If there is less than 1.5 meter free height above the steering
gear, arrangements to cut the deck above the steering gear room and/or lower the rudder stock will be required.
After service, KM will document the actual condition of the steering gear in a separate report with picture, and
it is the customer’s responsibility to notify the class society in order for them to survey the completed service.
Rotor
Piston bolts
Upper housing
Lower housing
Actuator seals
Bearing pads
Feedback unit
