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This manual is copyrighted, all rights reserved. It may not, in whole or in
part, be copied, photocopied, reproduced, translated or reduced to any
electronic medium or machine-readable form without prior consent in
writing from Aqua Lung International. It may not be distributed through the
internet or computer bulletin board systems without prior consent in writing
from Aqua Lung International.
©2010 Aqua Lung International
Apeks DST First Stage Technical Maintenance Manual
This manual provides factory prescribed procedures for the correct service and
repair of the Aqua Lung
®
or Apeks regulator products described in this manual.
It is not intended to be used as an instructional manual for untrained personnel.
The procedures outlined within this manual are to be performed only by
personnel who have received Factory Authorized training through an Aqua
Lung Service & Repair Seminar. If you do not completely understand all of
the procedures outlined in this manual, contact Aqua Lung to speak directly
with a Technical Advisor before proceeding any further.
NOTES are used to emphasize important points, tips and reminders.
CAUTIONS indicate any situation or technique that will
result in potential damage to the product, or render the
product unsafe if instructions are not followed correctly.
WARNINGS indicate a procedure or situation that may
result in serious injury or death if instructions are not
followed correctly.
If the regulator is subjected to less than 50 dives per year, it is
permissible to overhaul it every other year with an inspection
procedure being performed on the “off” years. For example:
Year #1: Inspection
Year #2: Overhaul
Year #3: Inspection
Year #4: Overhaul, and so on.
Both Inspections and Overhauls need to be documented in the Annual Service
& Inspection Record in the back of the Owner’s Manual to keep the Limited
Lifetime Warranty in effect. If a regulator is subjected to more than 50 dives
per year, it should receive the complete overhaul.
1. A pressurized immersion test of the entire unit to check
for air leakage.
2. Checking for stable intermediate pressure that is within
the acceptable range.
3. Checking for opening effort that is within the
acceptable range.
4. Checking for smooth operation of the control knob and
venturi switch.
5. A visual inspection of the lter for debris or discoloration.
6. A visual inspection of the exhaust valve to see that it is in
good shape and that it’s resting against a clean surface.
7. A visual inspection of the mouthpiece looking for tears
or holes.
8. Pulling back hose protectors and checking that the hoses
are secure in the hose crimps.
If a regulator fails item #1, 2, 3 or 4 the entire regulator should be overhauled.
If a regulator fails 5, 6, 7 or 8, it will be up to the technician’s discretion whether
or not a full overhaul is required.
NOTE: A unit that receives heavy or frequent use, such as rental, in-
struction, or commercial applications, should be serviced at least twice
a year - or more often - depending on the conditions of use and the
manner in which it is maintained. (Refer to the care and maintenance
procedures outlined in the Regulator Owner’s Manual.)
1. In order to correctly perform the procedures outlined in this manual,
it is important to follow each step exactly in the order given. Read
over the entire manual to become familiar with all procedures before
attempting to disassemble the product in this manual, and to learn
which specialty tools and replacement parts will be required. Keep
the manual open beside you for reference while performing each
procedure. Do not rely on memory.
2. All service and repair should be carried out in a work area
specically set up and equipped for the task. Adequate lighting,
cleanliness, and easy access to all required tools are essential for an
efcient repair facility.
3. As the regulator is disassembled, reusable components should be
segregated and not allowed to intermix with nonreusable parts or parts
from other units. Delicate parts, including inlet ttings and crowns
which contain critical sealing surfaces, must be protected and isolated
from other parts to prevent damage during the cleaning procedure.
4. Use only genuine Aqua Lung® parts provided in the overhaul
parts kit for this product. DO NOT attempt to substitute an Aqua
Lung® part with another manufacturer’s, regardless of any similarity
in shape or size.
5. Do not attempt to reuse mandatory replacement parts under any
circumstances, regardless of the amount of use the product has re-
ceived since it was manufactured or last serviced.
6. When reassembling, it is important to follow every torque
specication prescribed in this manual, using a calibrated torque
wrench. Most parts are made of either marine brass or plastic, and
can be permanently damaged by undue stress.
7. In order to make the regulator compatible with nitrox up to 40%
O2 (EAN40) after maintenance, the regulator must be properly
cleaned, lubricated and assembled using genuine Aqua Lung® or
Apeks replacement parts. In addition, assembly must be carried out
in a clean environment using powderless, latex gloves or equiva-
lent. For more detailed information, be sure to read Procedure A:
Cleaning and Lubrication at the back of this manual.
General Conventions
Unless otherwise instructed, the following terminology and techniques
are assumed:
1. When instructed to remove, unscrew, or loosen a threaded
part, turn the part counterclockwise.
2. When instructed to install, screw in, or tighten a threaded part, turn
the part clockwise.
3. When instructed to remove an o-ring, use the pinch method
(see illustration below) if possible, or use a brass or plastic o-ring
removal tool. Avoid using hardened steel picks, as they may damage
the o-ring sealing surface. All o-rings that are removed are discarded
and replaced with brand new o-rings.
Pinch Method
Press upwards on sides of o-ring to
create a protrusion. Grab o-ring or
insert o-ring tool at protrusion.
4. The following acronyms are used throughout the manual: MP is
Medium Pressure; HP is High Pressure; LP is Low Pressure.
5. Numbers in parentheses reference the key numbers on the
exploded par ts schematics. For example, in the statement,
“...remove the o-ring (7) from the crown (8)...”, the number 7 is
the key number to the crown o-ring.
Copyright Notice
Pay special attention to information provided in warnings, cautions and notes
that are accompanied by one of these symbols:
INTRODUCTION
Warnings, Cautions & Notes
Scheduled Service
An Ofcial Inspection Consists Of:
General Guidelines
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