4-2 4.0 MAINTENANCE
4125 SIDE SCAN SONAR SYSTEM 0004823_REV_F
To extend the life and increase the reliability of the connectors, apply a thin film of silicone dielectric
grease, such as Novagard G624 general purpose silicone grease or an equivalent, to the entire surface of
each male pin. A small amount of grease should also be applied to the opening of each female socket. Use
only a small amount, as packing too much grease will cause a hydraulic lock, preventing the connectors
from being properly mated.
NOTE: Remember to always install dummy connectors on the connectors
of the tow cable and the towfish tow cable connector.
4.2 Re-arming the Towfish
Should the shear pin snap, the towfish must be rearmed with a new one. Spare shear pins and retaining
clips are in the spares kit. Be sure to use a plastic shear pin from the spares kit. Use of a metal shear pin is
not recommended unless it is the only available option. A metal pin may not shear if the towfish hits an
obstruction or becomes snagged, resulting in the loss of the towfish should the tow cable break.
In addition, when the tow cable connector on the towfish pulls out during recovery from a snag, it exposes
the live tow cable contacts to seawater. Immediately deactivate the system if this happens to prevent
electrolysis on the connector pins. Always check the female tow cable connector and tow fish connector
for any evidence of damager prior to rearming the towfish. If any oxidation is present, the tow cable may
have to be re-terminated.
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