must also be
for chain
adjustment, which is most easily achieved by
removable shims placed under the mounting
foot, or by elongated clearance holes in the
mounting frame as illustrated in Fig. 6. Both
sprockets must be accurately aligned to run in
the same plane, and this must be carefully
checked by means of a straight-edge.
The grease lubricated gearbox permits
mounting of the drive unit in any convenient
attitude without risk of oil leakage. The drive
unit’s sprocket may also face any direction,
since steering sense can be corrected by
means of a phase switch located in the control
unit.
Finally, the chain should be tensioned until
it is ‘just’ tight and contributes negligible lost
motion to the drive system. Total lost motion
between the driven sprocket attached to the
steering system and the rudder stock should
not exceed 2% of total movement. If lost motion
exceeds this level, it should be corrected,
otherwise steering performance will be
impaired.
Fig. 8
HARDOVER-HARDOVER
TIME RECOMMENDATIONS
40
1
Fig. 7
