Demand Regulator & Exhaust System Overhaul - Kirby Morgan 77 Operation And Maintenance Manual

7.8 Demand Regulator & Exhaust
System Overhaul
The Kirby Morgan 77 helmet uses a unique pod
system. The pod is designed to serve as the mount-
ing point for the regulator. Under normal conditions,
it is not necessary to remove the pod to service the
regulator.
Note that there are two different length pod mounting
screws; six short screws and two longer screws. Also,
some of the screw heads are positioned on the outside
of the helmet shell, while others are on the inside.
The exhaust and dewatering valves are made of high
grade silicone. The exhaust and dewatering valves
are very durable and resilient however they should be
replaced at least once a year or whenever inspection
reveals any signs of damage or deterioration.
All o-rings should be replaced at least once a year
or whenever damage/deterioration is present or sus-
pected. In order to replace the main exhaust valve, the
demand regulator must be removed from the helmet.
Removing the regulator is not difficult if these instruc-
tions are followed.
The regulator can be removed without removing the
Valve
Valve
body
Regulator
Mount nut
Water dump
valve
Pod Gasket
© ⅯⅯⅩIⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318003
Oral/nasal mask
Helmet shell
Exhaust
whisker
Whisker
Main tube
Blowapart of KM77 regulator with pod and oral/nasal mask.
pod. However, during overhauls the pod should be
removed for inspection and gasket replacement.
7.8.1 Pod System and Regulator Removal
Tools required:
3/8" socket with driver
torque screwdriver with flat blade attachment
5/32 inch hex key
1) Remove the chin strap by removing the screws that
secure it.
To remove the pod, start by removing the chin
strap.
Pod
Valve body
Horseshoe
Inlet valve
Nipple tube
Kirby Morgan
Exhaust valve
Adjustment knob
Sleeve
Adjustment
Shaft
Exhaust
valve
Washer
Cover
Diaphragm
Roller
lever
77
®
Cover Retaining
Ring
95