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Note 1:
The FD-80 lens port uses 2 O-rings (one Radial
O-ring and one
Compression seal O-ring)
for a watertight seal. Radial O-rings are
affected by friction when closing the seal, as it rubs against a housing
wall. Therefore a radial O-ring, such as the O-ring on the port, requires
lubrication.
Note 2
Lubrication of an O-ring does not improve the seal. It only reduces the
amount of friction on the O-ring when it is being moved into sealing
position. The amount of lubrication required on the port O-ring is only
enough to allow it to slip into place without friction, so it does not twist or
become dislodged. More grease is not better, and could in some cases
have a negative affect if it is applied in large amounts to form a build-up
that could trap any debris or foreign matter.
Open Housing:
Release all three latches at same time, and lift off back half to open housing.
Opening the levers- To overcome the friction of opening, two levers are used to push
against the lid with a cam action. See picture attached.
Important!
Be sure they are inserted all the way flat to the
housing before turning to avoid damaging the
protrusions on the lid.
Inspect and clean main O-ring:
Use a clean wet cloth. Use only water to clean the O-ring sealing surface.
Do not remove the O-ring unless there is evidence that there is a need to clean the underside
surface, or the channel it sits in.
If the O-ring does need to be removed for cleaning or replacement, use your two thumbs and at
the top corner of the housing where the O-ring groove is, push up from both side until a corner
of the O-ring raises above the groove and gently grasp this O-ring section and pull it off the
housing.
When replacing the O-ring, place it back into the groove starting at the same corner and gently put it in by
pressing it into the groove all around the housing until it is all sitting in the groove and no part of it is
