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Adjust each catch (as
below) such that it
shows no slack when
closed, and only light
thumb pressure is
required just before it
shuts tight.
• TB4000 Series (Standard) – Use a screwdriver to turn the adjusting screw (A)
under the catch-lever.
• TB4900 Series (Severe Environments) – Manually rotate the adjusting thumb
screws (B) between each thumb-catch.
Thermocouple Wear-strips
The Mullite fiber wear-strips in the base and lid can be replaced by the user as
follows.
In the barrier base . . .
1. Undo the screws
retaining the bracket that
secures the wear-strip
inside the barrier (C–D).
2. Remove the old Mullite
fiber wear-strip (B).
3. Thread the new Mullite
fiber wear-strip over the
small-diameter bar inset
from the carrying handle (A), and over the face of the inside insulation.
4. Fasten the ends of the new wear-strip with the bracket and screws (C – D).
In the barrier lid . . .
1. Unscrew the six retaining
screws (C–D), and
remove the insulation
layer and metal plate.
2. Remove the old Mullite
fiber wear-strip (B).
3. Thread the new Mullite
18
Basic Hardware
A
FURNACE TR ACK ER
B
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