Side Block Assembly - Kirby Morgan 77 Operation And Maintenance Manual

Kirby Morgan 77
®

7.4 Side Block Assembly

7.4.1 General
The side block should be overhauled at least annually,
or whenever components show signs of wear, damage
or do not function smoothly or properly. Minimum
replacement components during overhaul includes
all o-rings. A repair kit is available for replacement
parts, KMDSI Part #525-311, which includes o-rings.
The side block does not require removal from the
helmet each time an overhaul is being conducted
providing inspection of the internal passages does not
reveal contamination or excessive corrosion. However,
the side block should be completely removed at least
every three years of active use to ensure fasteners are
not corroded or frozen.
The side block assembly is held in place on the helmet
frame by a stud, flat washer, lock washer, nut, and a
machine screw. The screw does some securing but its
main function is to prevent rotation of the side block.
The stud also extends into the interior of the helmet
frame far enough to secure the air train by means of
Loosening the bent tube from the side block.
a washer and nut.
The air train in the KM77 is different from most other
Kirby Morgan helmets. The train itself consists solely
of a brass tube that snaps into a rubber block which
sits in a recess inside the helmet.
A spares kit is available for rebuilding the side block.
Order KMDSI Part #525-313.
7.4.2 Removal of the Bent Tube
Tools Required:
3/16 inch Open End Wrench
The bent tube assembly can be entirely removed be-
fore removal of the side block assembly is started. It
can also be removed from the block and left attached
to the regulator.
1) Completely unscrew the bent tube assembly nut
from the side block.
2) Loosen the lower bent tube nut by turning the
wrench up.
3) Unscrew the bent tube nut until it comes free, then
Swing the bent tube down and out of the way.
pull the bent tube assembly straight out of the regula-
tor inlet nipple.
4) The side block assembly is ready to start removal.
80 © ⅯⅯⅩIⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318003