Sperry Marine 5016-CA, Operation, Installaion And Service Manual

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056376/A Analogue Compass Repeaters
5-6 Bearing Repeater
Installing Bearing Repeater with Adjustable Bearing Bracket
The adjustable bearing repeater bracket 4905 is typically fitted to a bul-
wark or other vertical surface parallel or perpendicular to the vessel’s
fore-and-aft line. The position of the adjustable bearing bracket(s) is to
be chosen that the vessel’s superstructure does not unduly obstruct the
view of the horizon when bearings are taken. In case one bearing
bracket does not allow take bearings in a full circle of 360°, a second
adjustable bearing bracket must be installed for compensation.
The shipyard is to provide the mounting surface with four M 10 bolts or
welded studs, to which the bracket is then attached with nuts and spher-
ical washers with conical seats. The mounting surface should be as
exactly parallel or perpendicular to the fore-and-aft line as possible. The
mounting method permits to correct a misalignment of ±3.0° max.
To install the adjustable bearing bracket and bearing repeater:
1. Check that the mounting facilities provided by the shipyard match
with the specifications given in dimension drawing 4905-0112-03.
2. Screw a thin M 10 nut onto each of the four mounting studs.
Leave a few threads exposed between the nuts and the mounting
surface to allow for fine-adjustment of the nuts’ positions later.
3. Put a spherical washers with conical seat onto each of the nuts.
4. Fasten the adjustable bearing repeater bracket to the attachment
studs with four thin nuts and spherical washers with conical seats.
Tighten the nuts only lightly.
5. Loosen one of the lock nuts securing the trunnions in the gimbal ring
and screw back the trunnion by approximately 2 cm.
6. Hold the repeater in a convenient position close to the bracket.
Unwind the repeater connection cable and run it through the gimbal
ring from above.
7. Lift the bearing repeater into the gimbal ring so that the lubber line
points in the forward direction.
8. Locate the fixed trunnion in the bushing in the repeater.
CAUTION Risk of wrong installation
Wrong positioning of the bearing stand will obstruct to take bearings.
Always make sure that the bearing stand is so positioned that the ves-
sel’s superstructure does not unduly obstruct the view of the horizon.
In case one bearing stand does not allow to take bearings in a full circle
of 360°, a second bearing stand must be installed for compensation.
CAUTION Risk of damage
The bearing repeater is a heavy instrument.
To avoid any damage during installation of the bearing repeater into the
gimbal ring, the installation should be carried out by two service persons.
Note The installation of the repeater in the gimbal ring should be carried out
by two service persons.