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6. Recommended spares and maintenance:
Transducer replacement:
Whenever a Transducer/TRU needs to be replaced and/or or ordered as spare, the following
should be considered and specified:
- Presently installed TRU Serial Number as found inside NJC-80 on the cable
termination end transparent screen core connected to the chassi plate ground screw.
A yellow shrink tube is marked with black figures,
x either:
6-XXXX for a TRU with 30 metres cable length
which defines ordering CODE CFT-780;
x or:
6-XXXX-40 for a TRU with 40 metres cable length
which defines ordering CODE CFT-780-4;
Besides the TRU also a Sealings exchange kit is needed whenever the TRU is replaced and/or
partly used when maintenance/service work is carried out.
A complete TRU Sealings exchange kit, ordering P/No: 71-22220-00, comprises:
(ordering P/Nos refer to previous Fig. 1.1 and Fig 2.1 above)
2 pcs P/No: 00-00500-23 SAL T/860 LIP SEAL /DI 137
1 pc P/No: 00-00730-87 O-RING 34.52 X 3.53
1 pc P/No: 71-22186-01 SALT/860 FLANGE GASKET
1 pc P/No: 71-22450-00 SAL T/860 TRU CABLE GLAND ASSY
General dry-docking and maintenance routines:
At dry-docking it is recommended to inspect/replace the Zinc Ring in the outer base of the
Bottom Flange, (ordering P/No refers to previous Fig. 1.1 and Fig 2.1 above):
1 pc P/No: 71-22102-00 SAL T Zinc Ring
Care and caution should be carefully considered in order to protect the TRU sensor surface
during outside hull works, e.g. sand blasting, hull grinding, welding work, painting, etc., thus
also any temporary protecting cover of the TRU should be properly removed/cleaned off
before undocking as well as any marine growth should be carefully removed.
Use no sharp-edged metallic tools!
Wooden/Plastic or cloth/rag based tools are normally enough for marine growth removal.
Certain not too aggressive solvents may also be used with care.
Further recommendation to prevent the TRU from damage during dry-docking is to retract the
TRU inboard to avoid possible accidental resting on drydock bottom blocks as well as other
mechanical wear.
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