Extended Indicator Installation - TDW PIG-SIG IV Operating And Maintenance Instructions Manual

Scraper passage indicator
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Note: A rotary cap indicator must
be reset manually. When the
rotary
counterclockwise
stops, a unidirectional trigger
is in the down or "reset"
position. When it is turned
clockwise until it stops, a
unidirectional trigger is in the
up, or "pig passed" position.
When the rotary cap is turned
clockwise
counterclockwise
stops, a bi-directional trigger
is in the up or "pig passed"
position. The down or "reset"
position is halfway between
the two stops for a bi-
directional trigger.
3.4 Extended Indicator
Installation
Note: Special extensions are used
in rotary cap applications –
extension and rotary cap are
made as one unit.
3.4.1 Install Extension
Thread extension onto nipple.
Make sure hex fitting of shaft
seats into drive sleeve. See Figure
35.
cap
is
turned
until
until
it
or
Figure 35. Install Extension
it
3.4.2
A. Remove
housing/cap assembly.
B. Loosen set screws in spring
retainer and cam (steps E-G,
page 16 of this manual).
C. Remove spring retainer, cam
and torsion springs from
shaft.
D. Remove spacer and washer
from shaft. See Figure 36.
Note: You may need to file shaft
where set screws bite into
shaft to make removal easier.
Figure 36. Remove Spacer and Washer
22
Install
Assembly
cover
Indicator
from

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