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APPENDIX 2 PROCEDURE FOR RET-
ROFITTING
When retrofitting the CH series with the CSH-8LMARK-2, it is not necessary to change the retrac-
tion tank. However, the hull unit must be chosen according to retraction tank length. Refer to the
table below to choose hull unit. This must also be done with the 1800 mm or 3500 mm retraction
tank.
Tank length (L) mm
600 < L
750
750 < L
1000
1000 < L
1800
1800 < L
3500
Note: The hull unit CSH-8041-A (400 mm transducer travel) cannot be used.
Installation when retraction tank is more than 750 mm long
1. Calculate the necessary length of the main shaft.
• Main shaft length = Tank length + 565 mm (see page AP-5).
• If there is a sufficient space above the hull unit, it is not necessary to cut the main shaft; the
main shaft is installed with its top portion protruded beyond the top of the hull unit.
• If the cut length of the main shaft is less than 50 mm, use it without cutting the shaft. Wa-
terproofing attachment is not necessary. Note, however, that protrusion length of the trans-
ducer is reduced.
2. Cut the main shaft to the necessary length.
• It is recommended to use a machine lathe to shorten the shaft.
• Chamfer the top of the main shaft as shown below. (For chamfering with a file use a fine file
and finish the surface as smooth as possible.)
• When clamping the shaft with a clamp, be careful not to damage the shaft surface.
• When a metal saw is used to shorten the shaft, finish the top of the shaft so that it is level
within 3 mm.
AP-2
Hull unit type
CSH-8040-A-107-N-13
CSH-8040-A -85-N-13
CSH-8040-A -107-N-15
CSH-8040-A -85-N-15
CSH-8040-A -107-N-23
CSH-8040-A -85-N-23
CSH-8040-A -107-N-40
CSH-8040-A -85-Nx40
C1
R1
Transducer cable: 4200 mm,
Main shaft: 1300 mm
Transducer cable: 4200 mm,
Main shaft: 1550 mm
Transducer cable: 4900 mm,
Main shaft: 2350 mm
Transducer cable: 6600 mm,
Main shaft: 4065 mm
Within 3 mm
Remarks
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