B&G H5000 Pilot Computer - Manual (Page 108)

108 | Maintenance | H5000 Operation Manual
Winter Storage / Laying Up
Masthead unit
Storage of the masthead unit when the yacht is laid up afl oat will increase the life of the
transmitters. It should always be removed from the masthead before the mast is unstepped. It
should be stored in its packing box with the vane and cups removed. The exposed socket and
connector threads at the top of the mast should be smeared with silicone grease such as MS4
(Midland Silicones Ltd), and then protected with the plastic cap supplied with it.
The contacts in the masthead unit connector should be inspected for cleanliness and sprayed
with a water inhibitor such as WD40. The outer casing of the connector should also be
smeared with silicone grease.
The masthead unit must never be oiled. The bearings are of the sealed pre-lubricated type
and any additional oil may cause chemical breakdown of the existing lubricant. Any scratch
marks or corrosion on masthead unit spar should be rubbed clean with a soft cloth and lightly
smeared with silicone grease. This should not be necessary if care is taken when hoisting or
lowering the masthead unit, to protect it from collision against the rigging.
If the mast is un-stepped, care must be taken to ensure that the cable is not cut through, but
disconnected at the junction box below decks. The bare ends of the cable should be smeared
with silicone grease.