McLane Research Laboratories Mark 78H-21, User Manual

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1-12
Plastic Ball Bearings
The inside of the Gear Plate Assembly is filled with plastic ball bearings.
Figure 1-11: Bottom Fixed Plate and Gear Ring Figure 1-12: Plastic Ball Bearings
Variseals
®
The upper openings of the sample bottle holes are fitted with Teflon spring-loaded Variseal
®
gaskets to seal out ambient water and protect the samples from contamination. Do not apply grease
or lubricant to the gear ring, bottom fixed plate, or Variseals
®
.These gaskets are visible when the
gear plate assembly is detached from the top plate. A continuous Hastelloy circular spring inside
the gasket expands the upper and lower gasket halves.
Figure 1-13: Gear Ring with Variseals
®
Figure 1-14: Variseal
®
Installation
The plastic ball bearings and Variseals
®
in the gear plate assembly are highly durable and withstand
multiple years of deployment activity without replacement. McLane recommends replacing the
bearings and seals at the factory.
Bottom
Fixed Plate
Gear
Ring
Alignment
Hole