Genesis Scuba Atlas Operating instructions

Atlas & Yukon
(Part Numbers GRXXX & )
Second Stage
SERVICE & REPAIR
GUIDE

Contents
Contents
Introduction ............................................................................ 3
About This Manual .........................................................................3
Scheduled Service....................................................................................... 3
EAN/ Nitrox Service .................................................................................... 3
Use of Warnings, Cautions, & Notes ........................................................ 3
Function & Design ..........................................................................4
Section 1 – Facility Requirements ......................................... 5
Table 1 – Recommended Equipment and Suppliers ......................6
Section 2 – Preliminary Inspection ....................................... 7
External Inspection .......................................................................7
Immersion / Leak Test .....................................................................7
Section 3 – Disassembly Procedures .................................... 8
General Guidelines ........................................................................8
Section 4 – Cleaning Procedures .......................................14
Acidic Cleaning Procedure ......................................................... 14
EAN/Nitrox Cleaning Procedure ............................................... 17
Section 5 – Reassembly Procedures ...................................24
General Guidelines ..................................................................... 24
Section 6 – Final Testing Procedures ................................28
Table 2 – Troubleshooting Guide ........................................32
Schematic & Parts List – Atlas Second Stage...................33
Schematic & Parts List – Yukon Second Stage ..................35

3Copyright ©2001 Liberty Group
Service & Repair Manual
About This Manual
About This Manual
Introduction
Introduction
As a service technician, you are entrusted with maintaining your customer’s
equipment to the same standards with which it was manufactured. At Genesis, we
are committed to providing you with the tools you will need to accomplish this
important task, including the information provided in this manual.
Possession of this manual, however, does not constitute an offer by Genesis
Scuba to sell component parts, nor does it qualify you to perform service or repair
for Genesis Scuba products. In order to purchase spare parts or perform service
and repair, you must be directly employed by an Authorized Genesis Dealer. It is
also your responsibility to obtain factory authorized training through your Genesis Scuba distributor.
If you are ever unsure about how to perform any of the procedures outlined in this manual,
please contact Genesis Scuba for technical assistance.
Scheduled Service
Regulators should be given the same care and maintenance as life support equipment. It is
therefore important to perform scheduled overhaul service for the entire regulator (first and second
stages) at least once every year with normal or infrequent use.
A unit that receives heavy or frequent use, however, should be serviced at least twice each year -
or more often - depending on the conditions of use and the manner in which it is maintained. (Refer
to the maintenance procedures outlined in the Genesis Regulator Owner’s Manual.).
When performing service, whether it is a routine overhaul or a repair of a specific problem, it is
important to understand how the regulator is designed and how it operates. An illustrated
explanation of the Atlas/Yukon second stage design is provided on the following page.
EAN/ Nitrox Service
Genesis regulators can be upgraded for use with oxygen enriched air (EAN/ Nitrox) not to
exceed 40% oxygen content. This upgrade must be performed in conjunction with a complete
overhaul, and includes a special cleaning procedure that is outlined in this manual.
Use of Warnings, Cautions, & Notes
WARNING indicates a procedure or situation that may
result in serious injury or death if instructions are not
followed correctly.
CAUTION indicates any situation or technique that will
result in potential damage to the product, or render the
product unsafe if instructions are not followed correctly.
NOTE is used to emphasize important points, tips, and
reminders.

4
Copyright ©2001 Liberty Group
Atlas & Yukon Second Stage
Function & Design
Introduction
Introduction
Function & Design
The Atlas/Yukon second stage features a high performance, low volume
design with a mechanically balanced valve. Here's how it works:
▼ Intermediate pressure air (140 psi) enters through the inlet
coupling and orifice (1), where it meets the poppet and LP
seat. The poppet spring (2) holds the poppet against the
orifice with a pre-set tension that counteracts the intermediate
pressure. The poppet is balanced between the two forces.
▼ Airflow is actuated upon inhalation or purging, when the
diaphragm is drawn down over the lever (3). This pulls the
poppet away from the orifice.
▼ Air and water are channeled to flow out through the exhaust
valve (4), which is designed to minimize exhalation resistance
while keeping the case internally dry in all positions.
▼ (Atlas only - not shown) A dive/pre-dive switch can be set to
minimize or boost peak venturi airflow, according to the
diver's preference.
1
2
3
4

5Copyright ©2001 Liberty Group
Service & Repair Manual
Facility Requirements
s e c t i o n
Facility Requirements
s e c t i o n
The service facility is perhaps the most important asset of
any professional dive store. It should be clean and well
lighted, and stocked with a complete inventory of parts and
manufacturer's specialty tools for the products your store sells.
As a minimum requirement, your service facility should be
equipped with the following items:
❏ Ultrasonic Cleaner – Select the right size model that can
keep up with the volume of regulators that your store services.
A built in timer and heater will help control the cleaning time
and temperature of the solution, since most solutions work best
when heated.
❏ Bench Mounted Vise – A vise is sometimes needed to hold
the regulator secure – especially when removing the first stage
yoke retainer. Special care must be taken, however, to avoid
damage that can result from improper use of this tool. Be sure
to follow the instructions provided in this manual.
❏ Magnification Lamp – Strong lighting and magnification are
essential requirements for performing a thorough parts inspec-
tion - especially when locating the cause of a small leak.
❏ Quality Wrenches & Sockets – When working with chrome
plated brass parts, it is especially critical to use the correct size
wrench and to ensure that it fits properly over the part. The use
of an adjustable wrench is very likely to cause damage to your
customer's regulator, and should be strictly avoided at all times.
❏ Calibrated Inch-Pound Torque Wrench – It is important to
follow the manufacturer's torque values whenever they are
specified, in order to avoid overtightening or under-tightening a
part. This is especially important for smaller parts and fittings,
when overtightening can easily damage the part.
❏ Calibrated Foot-Pound Torque Wrench – Torque
wrenches that can be set for both inch-pound and foot-pound
measurements generally tend to be less accurate than wrenches
that are designed to measure torque within a specific range.
❏ Manufacturer's Specialty Tools – Specialty tools are
critically important to performing each step of disassembly and
reassembly according to each manufacturer's procedures.
Genesis specialty tools that are required to perform service for
the Atlas and Yukon second stages are pictured on the following
page.
1

6
Copyright ©2001 Liberty Group
Atlas & Yukon Second Stage
Table 1 – Recommended Equipment and Suppliers
The specialty tools shown below can be purchased directly from Genesis Scuba. For other items needed to outfit your store's
service facility, we recommend the following suppliers:
Table 1 – Recommended Equipment and Suppliers
Genesis specialty tools are made in the USA by Peter Built Co . Illustrations courtesy of Peter Wolfinger.
Peter Built Co. Manufacturer of custom designed specialty tools Galion, OH 44833
www.scubatools.com and test fixtures Phone: [phone]
Branson Ultrasonics Manufacturer of tabletop ultrasonic cleaners Danbury, CT 06813
www.bransoncleaning.com Phone: [phone]
LubricationTechnology Manufacturer of Christo-Lube 111 Jackson, OH 45640
(Genesis approved lubricant) Phone: [phone]
Lawrence Factor, Inc. Manufacturer of LFW™(Lawrence FactorWash) Miami Lakes, Florida 33014
www.lawrence-factor.com (Genesis approved acid bath cleaning solution) Phone: [phone]
Modern Chemical Distributor of Blue Gold Aqueous Cleaner Batesville, Indiana 47006
Ohio Corporation (Genesis approved aqueous cleaning solution for EAN/ Nitrox Service) Phone: [phone]
www.a1.com/bluegold
Simple Green Manufacturer of Crystal Green Aqueous Cleaner Huntington Harbor, CA 92649
www.simplegreen.com (Approved alternative aqueous cleaning solution for EAN/ Nitrox Service) Phone: [phone]
Sears Roebuck Retail distributor of Craftsman®tools
www.sears.com/craftsman
Atlas/ Yukon Specialty Tools
100
200
80
60
40
20 180
160
120
IP RANGE
125-150 PSI
PSI
PETER BUILT
"Quality in the making"
[phone]
USE NO OIL
140
25
50
150
125
100
75
175
200
225
250
275
300
0
IP RANGE
125-150 PSI
PSI
USE NO OIL
PETER BUILT CO.
"Quality in the making"
[phone]
260 3.5 x 60
260 2.0 x 50
Select Tool Kit (5 pcs) # 11-090-500
Intermediate Pressure
Test Gauge, #20-510-100
O-ring Tool Set #10-102-
Dual Drive In-Line Adjusting Tool # 20-500-200
Genesis Rim Clamp # 20-680-200
Genesis Poppet Tool Kit #20-640-

7Copyright ©2001 Liberty Group
Service & Repair Manual
s e c t i o n
2
s e c t i o n
External Inspection
1. Closely examine the conical filter of the first stage to check
for any signs that contaminants have entered the system,
including sea water, rust, or aluminum oxide.
NOTE: Agreendiscolorationpositively indicates that mois-
ture has entered the regulator, and internal corrosion may
have occurred. Other types of discoloration may indicate
that the regulator has been used with a corroded cylinder.
Advise the customer of this, and the possible need to obtain
service for their cylinder.
2. Slide back the hose protector(s) to inspect the condition of
the LP hose at its fittings and along its length. Check
closely for any signs of blistering or abrasion, or corrosion
of the fittings.
3. Inspect the condition of the mouthpiece to check for torn
bite tabs, holes, or deterioration.
Immersion / Leak Test
1. Check to ensure that the regulator is fully assembled and
connected to a first stage, and that there are no open ports
or hoses. Connect the first stage to a cylinder that is filled
with 3,000 psi, and open the cylinder valve to pressurize
the regulator.
2. If leakage cannot be heard, or if the source of leakage
detected audibly is not obvious, immerse the second stage
in fresh water to check further for any signs of air leakage
through the mouthpiece and at the hose fitting.
3. Note the source of any leakage found and refer to Table 2
- Troubleshooting to determine its possible cause.
4. Close the cylinder valve and depress the second stage
purge cover to depressurize the regulator.
▼ After completing the Preliminary Inspection, proceed to
Section 3 – Disassembly
Preliminary Inspection
Preliminary Inspection

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Copyright ©2001 Liberty Group
Atlas & Yukon Second Stage
Disassembly Procedures
s e c t i o n
3
s e c t i o n
Disassembly Procedures
General Guidelines
▼ Prior to performing any disassembly, check to ensure that
the service facility is well equipped with all the tools and
parts needed to perform a complete service from start to
finish. DO NOT attempt to perform the service unless all of
the required tools and parts are available.
▼ All o-rings are classified as being either dynamic or static.
Dynamic o-rings are those which sustain friction and
movement, as they are either mounted directly onto a
moving part, or create a seal against a moving part.
Static o-rings simply create a seal between two non-
moving parts, and are therefore less subject to wear than
dynamic o-rings. After passing close inspection, static
O-rings may sometimes be reused, although this is not
necessarily recommended. Dynamic O-rings must be
automatically discarded and replaced with every service,
regardless of age or appearance.
▼ Refer to the schematic and parts lists provided on page 37
& 39 while performing these procedures. Each part is
identified by its reference number shown on the drawing
the first time it is referred to in the procedure.
▼ Do not attempt to reuse parts that are designated to be
automatically discarded and replaced with the parts
provided in the overhaul parts kit. These parts should be
shown to the customer, however, to ensure their confi-
dence and satisfaction that complete overhaul service has
been performed.
▼ Inspect all reusable parts as directed, either during or
immediately following the disassembly procedures. When
in doubt, compare the part with one that is new to best
determine its condition.

9Copyright ©2001 Liberty Group
Service & Repair Manual
Fig. 1 –␣ Serial Number Location
Fig. 2 –␣ O-ring RemovaL
CAUTION: Whenever possible, use only plastic or brass O-
ring tools for removing O-rings in order to prevent damage
to the sealing surface. Steel instruments, such as dental
picks,caneasilydamage thesealingsurfaceofasofter brass
part, causing irreparable leakage and requiring the part to
be replaced with new.
1. Snip the plastic tie-strap(14) that holds the mouthpiece(12),
and gently pull the mouthpiece off the second stage
case(11). Record the serial number that is affixed directly
below the mouthpiece tube, and compare it to the
customer’s invoice or service record to determine whether
it is eligible for warranty service (see Fig. 1). Inspect the
condition of the mouthpiece to ensure that it is supple and
free of any tears or corrosion. If any damage is found that
could result in discomfort or leakage, discard the mouth-
piece and do not reuse.
2. Slide back the hose sleeve(27) to expose the connection of
the LP hose(25).
3. While holding the inlet coupling(6) secure with a w" open-
end wrench, apply an n" open-end wrench to the fitting
of the LP hose. Turn the hose fitting counter-clockwise to
loosen and remove.
4. Using the O-ring pick that is provided in the Select Kit (PN
11-090-500), carefully remove the O-ring(26) from the
post inside the hose fitting (see Fig. 2).
CAUTION: The O-ring pick is made of steel and is very
sharp, and is only recommended for the removal of O-rings
that cannot be removed with a brass O-ring tool. When per-
forming the above step, be very careful to avoid scratching
the O-ring sealing surface. Doing so may cause a perma-
nent leak that will require the replacement of the LP hose.
5. While holding the diaphragm cover(2) fully depressed in
the purge position, apply a w" open-end wrench to the
inlet coupling and turn it counter-clockwise to loosen and
remove.
6. Remove and discard the O-ring(7) from the inlet coupling.
Do not reuse.
7. While holding the inlet coupling secure, apply a medium
blade screwdriver to the slotted head of the valve ori-
fice(5). Turn the orifice counter-clockwise until its threads
have completely disengaged from the inlet coupling.

10
Copyright ©2001 Liberty Group
Atlas & Yukon Second Stage
Fig. 3 – Orifice Removal
Fig. 4 – Orifice Inspection
Fig. 5 – Genesis Rim Clamp
NOTE: The orifice is O-ring sealed and will remain inside
the inlet coupling after performing the above step. The fol-
lowing step must be performed correctly in order to remove
the orifice without damaging its polished sealing edge.
8. After the orifice has been unthreaded from the inlet cou-
pling, stand the inlet coupling on end with the orifice
sealing edge facing up. Carefully insert the handle of the
blunt probe (provided in the Select Kit) through the top of
the inlet coupling, directly over the sealing edge of the
orifice. Gently press the orifice out (see Fig. 3).
9. To avoid using a sharp tool that can damage the orifice,
squeeze the O-ring(4) between thumb and forefinger to
remove it from the orifice head. Discard the O-ring and
do not reuse.
10. Closely examine the orifice with the use of a magnifier,
checking for any scratches or other damage to the sealing
edge and the groove that holds the O-ring (see Fig. 4). If
any damage or wear is found, discard the orifice and do
not attempt to reuse. If it is in reusable condition, set it
aside on a soft surface to keep it isolated from metal parts.
11. While holding the bottom of the second stage secure with
one hand, firmly grasp the cover ring(1) with the other,
and turn the ring counter-clockwise to loosen and remove.
NOTE: If the cover ring cannot be removed by hand, it may
be necessary to use the Rim Clamp (PN 22-680-200), to-
gether with a bench-mounted vise. This Genesis specialty
tool has been designed to prevent damage to the cover ring
orthesecondstage duringdisassembly,butitmustbeused
correctly, following the steps outlined below.
a. Identify the side of the Rim Clamp that contains the
larger diameter shoulder, which is designed to hold the
Atlas/ Yukon cover ring. Place the Rim Clamp between
the jaws of a bench mounted vise with the larger diam-
eter side facing straight up, and the split edge parallel
with the vise jaws (see Fig. 5). Ensure that the top
surface of the clamp rests slightly above or flush with
the top surface of the vise jaws, and gently tighten the
vise only until the clamp is held securely in place. Do
not over-tighten or compress the clamp.
b. Place the second stage inside the clamp, with the cover
ring facing down. Tighten the vise to compress the
clamp, only as far as is needed to secure the clamp
around the cover ring to prevent slippage.

11 Copyright ©2001 Liberty Group
Service & Repair Manual
Fig. 6 – Cover Ring Removal
Fig. 7 – Genesis Pop p et Drive Tool
Fig. 8 – Disassembly of Pop p et
CAUTION: Do not over-tighten the vise. Doing so may
permanently distort or fracture the cover ring and the case,
requiring their replacement.
c. When the cover ring is held secure, firmly grasp the
second stage with both hands and rotate the second
stage counter-clockwise in a level direction above the
clamp (see Fig. 6).
d. After loosening the cover ring, open the vise to loosen it
further by hand to remove it.
12. Lift the diaphragm cover directly out of the case to expose
the diaphragm(3), and closely inspect the cover to ensure it
is perfectly round and free of any distortion or other dam-
age. If any damage is found, discard the cover and
replace with new.
13. Grasp the diaphragm by the raised edges of the center
plate, and lift it out of the case with a slight twist. Inspect
the diaphragm to ensure it is supple and free of any pin-
holes, tears, corrosion, or other damage. If any damage is
found, discard it and replace with new.
14. Mate the Poppet Drive Tool (provided in the Genesis Pop-
pet Tool Kit, PN 20-640-100) into the inlet tube of the
second stage, and turn the knob slightly in either direction
to engage the driver with the poppet(9). (See Fig. 7.)
Then, turn the hex nut clockwise by hand until lightly snug
to fasten the tool onto the second stage.
15. Press the knob of the tool inward to compress the poppet
spring until the arms of the lever(21) are visible, and pull
the lever out of the second stage. Relax the tool. Examine
the lever arm and compare with new to ensure that it is not
bent or distorted in any way. Discard if damage is found.
16. Apply the Poppet Nut Wrench (provided in the Poppet Tool
Kit) to hold the locknut(19) secure. Engage the Poppet
Drive Tool to turn the poppet counter-clockwise until the
locknut falls off the end of the poppet shaft. (See Fig. 8.)
17. Turn the case over to drop out the spacer(20) and
washer(22). Discard the washer and locknut, and do not
reuse. Inspect the spacer to check for any signs of wear.
If found, discard and replace the spacer with new, or set it
aside to be reused if it is in satisfactory condition.
18. Unscrew the nut of the Poppet Drive Tool from the second
stage inlet, and remove the tool to allow the poppet and
poppet spring(10) to fall out. Inspect the spring with a
magnifier to check for any signs of corrosion. Discard it if
corrosion is found, and do not reuse.

12
Copyright ©2001 Liberty Group
Atlas & Yukon Second Stage
19. Using the O-ring pick that is provided in the Select Kit,
lightly pierce the center of the LP seat(8) and pull it out of
the head of the poppet. Discard the seat and do not
attempt to reuse.
20. Remove the exhaust tee(13) from the second stage case to
expose the exhaust valve(15) for inspection.
CAUTION: It is important to follow the correct procedure
for removing the exhaust tee. Failure to do so can result in
permanentdamagetothe exhaustteeandthe second stage
case, requiring their replacement.
a. First, place the blade of a medium screwdriver inside
one of the openings of the exhaust tee, directly beneath
the flange and in front of the tab (see Fig. 9). Press the
flange between thumb and screwdriver and gently lift
the flange straight up, only until it disengages from the
tab. DO NOT pry at an angle.
b. Repeat the above step to disengage the other flange.
c. Hold the second stage case between both hands, and
apply both thumbs to opposite sides of the exhaust tee.
Press upward with equal pressure on both sides to
disengage the exhaust tee from the two upper tabs of
the case. (See Fig. 10.)
d. Closely inspect the exhaust tee to check for any signs of
damage that may have been caused by abuse or
improper disassembly. If found, discard it and replace
with new.
NOTE: It is not necessary to replace the exhaust valve
unless it shows signs of wear or decay upon inspection. If
replacement is not necessary, however, it is important to
avoid removing the exhaust valve from the case while per-
forming the inspection. Doing so will stretch the retaining
barb, and can eventually result in leakage of water past the
exhaust valve.
21. Closely inspect the condition of the exhaust valve to ensure
that it is evenly seated against the second stage case on
all sides, and free of any tears, holes, or other signs of
decay. Peel back the lip on all sides to ensure it is supple
and returns to its original position. If any wear or damage
is detected, or if stiffening has occurred, pull the exhaust
valve straight out of the case and discard it.
Fig. 9 – Exhaust Tee Removal - Step 1
Fig. 10 – Exhaust Tee Removal - Step 2

13 Copyright ©2001 Liberty Group
Service & Repair Manual
Atlas Second Stage Only:
22. Stand the case upside down with the mouthpiece tube
facing forward. Wedge the tip of a 2mm screwdriver
(provided in the Genesis Select Kit) against one end of the
retaining ring(11a) to prevent it from rotating around the
groove of the dive/pre-dive switch(11c). While holding it
secure, apply the 3.5mm screwdriver to the other end of
the retaining ring and press it through the mouthpiece tube
(see Fig. 11).
23. Gently press upward against the base of the dive/ pre-
dive switch inside the mouthpiece tube, and pull it out from
the opposite side to remove it from the case. Squeeze the
O-ring(11b) between thumb and forefinger to remove it
from the switch, and inspect it to check for any signs of
decay. Discard if found.
24. Closely inspect the switch to check for any signs of dam-
age – especially around the O-ring sealing groove, where
a small scratch can allow the entrance of water into the
second stage. Discard it and replace it with new if any
damage is found.
NOTE: Disassembly and replacement of the case plug is
not required for annual service, but should be performed
semi-annuallyorinthe eventthatthecustomerhasreported
leakage of water into the second stage. Proceed directly to
Step 27 if the case plug does not require replacement.
25. Using a medium blade screwdriver, gently work the retain-
ing ring(18) off the stem of the case plug(16) from both
sides. (See Fig. 12.)
26. Squeeze each of the retaining tabs inward, and press the
case plug out of the case. Discard the case plug,
O-ring(17), and retaining ring, and do not reuse.
27. Closely inspect all features of the second stage case to
check for any signs of damage or abnormalities, including
the condition of the plastic threads and the area surround-
ing the molded metal insert inside the inlet tube. Crazing
or cracks may be caused by exposure to extreme impact
or stress, or aerosol sprays. If any damage is found,
discard the case and replace with new during reassembly.
▼ After completing the disassembly of the second stage,
proceed to Section 4 – Cleaning & Lubrication
Fig. 11 – Atlas Retaining Ring Removal
Fig. 12 – Case Plug Removal

14
Copyright ©2001 Liberty Group
Atlas & Yukon Second Stage
Cleaning Procedures
s e c t i o n
4
s e c t i o n
Cleaning Procedures
Acidic Cleaning Procedure
(For Equipment Used With Compressed Air)
Introduction
This procedure provides complete instructions for cleaning reusable,
non-wearing components and parts of regulators and valves used with
standard Grade E compressed air. Acidic Cleaning must also be per-
formed as a prerequisite to performing Aqueous Cleaning — an addi-
tional procedure that is necessary for cleaning component parts of
equipment used with mixtures of oxygen enriched air (EAN/Nitrox)
containing more than 24% oxygen.
Acidic cleaning is a five step procedure that includes:
▼ Degreasing and pre-scrub, plastic parts cleaning
▼ Tap water rinse
▼ Ultrasonic acid bath
▼ Sodium bicarbonate neutralizing bath
▼ Distilled or de-mineralized water rinse
Required Equipment
❏Ultrasonic Cleaner – Essential to provide the most effective
removal of corrosion and scale from metal parts. It is impossible to
attain the same level of cleaning with any other method. Preferred
features include a built-in timer and a heater.
❏Screen Dip Basket – Provided with most ultrasonic cleaners,
allows the parts to be fully immersed in each solution, and trans-
ferred from one container to the next.
❏Separate Containers – It is important to use four separate con-
tainers, including the well of the ultrasonic cleaner, to hold each
solution so that the parts can be transferred quickly in the correct
sequence and with minimal delay. Each container should be ap-
proximately the same shape and size as the well of the ultrasonic
cleaner, so that the dip basket fits completely inside.

15 Copyright ©2001 Liberty Group
Service & Repair Manual
STEP 1 – Degrease & Pre-Scrub:
▼All reusable non-wearing parts, both plastic and metal, should first be
soaked and washed in a solution of 1 quart warm (100º F) water
mixed with 3-4 tablespoons of household dish soap (Dawn®or Joy®are
recommended). This will loosen and help to remove salt deposits and
grime from plastic parts, and remove excessive residues of lubricant
grease and grime from metal parts. This step will also extend the life of
the acid bath solution by reducing the amount of contamination that
occurs during cleaning.
▼A nylon brush can be used to scrub stubborn deposits of grime and salt
– especially for threaded metal parts and plastic parts.
CAUTION: DO NOT use a steel wire brush. Doing so can damage plat-
ing, threads, plastic parts, and sealing surfaces.
STEP 2 – Fresh Water Rinse:
▼After completing Step 1, it is important to rinse all parts in fresh tap
water to remove any soap residue, in order to prevent contamination of
the acid bath solution.
▼Step 2 completes the cleaning of all plastic parts.
STEP 3 – Ultrasonic Acid Bath:
CAUTION: It is important to carefully read and understand the Material
Safety Data Sheet (MSDS) for any cleaning solution before using it, in
order to be aware of the possible hazards associated with its use, and the
necessary precautions that must be followed to avoid them.
▼Genesis Scuba recommends Lawrence Factor Wash (LFW™) to be used
exclusively for the acid bath cleaning of all non-wearing metal parts.
LFW can be used in concentrated form, or can be diluted with up to
seven parts distilled water to extend the life of the solution.
▼For best results, LFW can be warmed to a temperature of approxi-
mately 120º F. Follow the directions provided on the label.
▼For best results, soak parts in an ultrasonic cleaner for 5 to 15 minutes
(depending on the strength of the solution), unless the finish is chipped
or scratched. Parts with damage to their finish should be cleaned
separately outside the ultrasonic cleaner to avoid agitation.
▼Be certain to isolate more delicate parts, such as orifice cones, to
prevent metal on metal contact with other parts or the dip basket that
can cause damage to sealing surfaces.
▼Use a timer to control the cleaning time, and do not leave parts
unattended while they are inside the acid bath.

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Copyright ©2001 Liberty Group
Atlas & Yukon Second Stage
CAUTION: Harsh acids, such as muriatic acid, may cause damage to
partsand mustbe strictlyavoided. Undilutedwhitevinegar, although less
effective, is the only recommended substitute for LFW™.
STEP 4 – Neutralizing Bath:
▼Thoroughly mix 8cup sodium bicarbonate (baking soda) with one
quart fresh tap water in a clean container. Remove the parts from the
acid bath, and immerse in this solution for 2-3 minutes.
STEP 5 – Final Rinse:
▼Use only distilled water, to prevent mineral stains on the plated finish of
newly cleaned parts.
▼Agitate lightly, and then allow to soak for at least 15 minutes.
▼Change the rinse often, to maintain a neutral PH.
▼Dry the parts afterward with low pressure (50 psi) filtered air.
▼Closely inspect all parts afterward to ensure they have been properly
cleaned and are in like-new condition.
CLEANING TIPS:
▼The yoke screw threads may be dipped into the acid bath, holding the
plastic portion out of the cleaner.
▼Be certain to isolate parts with critical sealing surfaces, including the
orifice, to avoid harmful contact with other metal parts.
▼If salt and corrosion buildup is severe around the hose fittings, immerse
only the fitting of each hose in the acid bath cleaner, in order to pre-
vent the solution from entering the hose. Rinse thoroughly in fresh
water using the same method, and hang the hose to dry suspended in
the middle with both ends hanging down. Blow low pressure (50 psi)
filtered air through each hose prior to installing it onto the regulator.
NOTE: The parts are now clean for use with standard compressed air,
not to exceed 24% oxygen content. Proceed directly to Section 5 –
Reassembly Procedures,orproceedto thefollowingpagefor additional
cleaning instructions if the regulator will be serviced or upgraded for use
with EAN/ Nitrox.

17 Copyright ©2001 Liberty Group
Service & Repair Manual
EAN/Nitrox Cleaning Procedure
(For Equipment Used With Oxygen Enriched Air)
Introduction
Genesis Scuba regulators may be upgraded for dedicated use with
mixtures of oxygen enriched air (EAN/Nitrox), not exceeding 40% oxy-
gen. This upgrade must only be performed by an Authorized Genesis
Dealer, and requires the installation of the first stage Nitrox overhaul/
upgrade parts kit that is provided specifically for each model first stage
regulator (refer to the schematic parts list).
Genesis Nitrox upgrade/overhaul parts kits contain O-rings, seats, and
washers made of materials that are proven compatible with oxygen en-
riched air, up to 40% oxygen. It is very important to replace all standard
replacement parts with those provided in each kit, and not to reuse any of
them or replace parts individually under any circumstances.
The parts contained in each kit have been specially cleaned and pack-
aged to ensure the absence of contaminants, and must be handled accord-
ing to the instructions provided in this procedure to avoid accidental con-
tamination.
NOTE: It is important to handle the contents of the Nitrox upgrade parts
kits with care, wearing rubber or plastic gloves to prevent contamination
with skin oil. In the event that contamination occurs, the parts must be
cleaned according to the procedure outlined below.
Prior to the installation of a Nitrox upgrade/ overhaul parts kit, the
regulator must undergo a complete overhaul service that includes special
cleaning and parts inspection according to the steps outlined in this proce-
dure. Special cleaning is necessary to remove contaminants from the
regulator that may react with oxygen enriched air.
Standard compressed air usually contains a certain level of hydrocar-
bons, including invisible traces of compressor oil, that are not considered
harmful or dangerous when kept within the acceptable limits for Grade E
compressed air. When these same levels of hydrocarbons come in contact
with oxygen enriched compressed air, however, they can pose a very real
hazard that can lead to an oxygen fire or explosion. For this reason, it is
important to clean the individual parts and components of any regulator or
valve before it can be used with enriched air, in order to remove all traces
of hydrocarbon contamination.
Although acidic cleaning is very effective for removing corrosion and
scale, it is not sufficient by itself to remove certain sources of contamination.
It is therefore necessary to perform an additional cleaning procedure that is
specifically formulated to remove all traces of silicone grease, skin oil,
compressor oil residue, and other hydrocarbon contamination.

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Atlas & Yukon Second Stage
EAN/Nitrox Cleaning is a four step procedure that includes:
▼ Pre-Cleaning with Ultrasonic Acid Bath
▼ Ultrasonic Aqueous Cleaning Bath
▼ Distilled or Demineralized Water Rinse
▼ Final Inspection (direct light, ultraviolet, and wipe test)
NOTE: Although second stage components are not usually exposed to
high pressure oxygen enriched air, Genesis Scuba recommends that the
same cleaning and assembly procedures be followed for the complete
regulator. This prevents the possibility of cross contamination, and guar-
antees the integrity of the complete system.
REQUIRED EQUIPMENT:
❏Dedicated Ultrasonic Cleaner – To avoid contamination, it is
important to use a separate cleaner that is kept dedicated for aqueous
cleaning, in addition to one used for acidic cleaning. Preferred fea-
tures include a built-in timer and a heater.
❏Screen Dip Basket – Provided with most ultrasonic cleaners, allows
the parts to be fully immersed in each solution, and transferred from
one container to the next.
❏Powderless Latex Gloves – Skin oil is another source of potential
contamination that can react with oxygen enriched air. Once the parts
have been cleaned, gloves must be worn at all times to prevent them
from becoming contaminated during handling.
❏Dedicated Rinse Tub – To avoid recontamination, it is important to
use a separate rinse tub that is kept clean and dedicated for aqueous
cleaning, in addition to the rinse tub that is used for acidic cleaning.
❏Incandescent or Fluorescent Lighting – Required during final
inspection to detect more obvious signs of contamination.
❏Ultraviolet Lighting – Required during final inspection to detect
contamination that is not visible beneath normal lighting.
❏Lint Free Cotton Wipes – Required for cleaning and inspection.
Preparing the Workstation
Enriched air cleaning procedures may be carried out in the same work
area that is used for servicing air scuba equipment, provided that it is kept
reasonably clean, and airborne pollutants (dust, soot, etc.) are not visibly
present on surrounding surfaces. Ventilation ducts and windows should be
checked to ensure that airflow will not introduce these contaminants while
cleaning and service is in process.
▼To ensure cleanliness, the work surface should be covered with a clean
sheet of butcher paper or plastic sheeting.
▼The technician must wear clean, non-powdered latex or plastic gloves
whenever handling cleaned parts (including upgrade parts kit), in order
to prevent contamination with skin oil.

19 Copyright ©2001 Liberty Group
Service & Repair Manual
NOTE: All tools and fixtures, including the ultrasonic cleaner well, must
be kept completely clean of any contaminants. For this reason, a sepa-
rate set of clean tools should be used for the reassembly of enriched air
equipment, different from those used for normal air equipment.
ACIDIC PRE-CLEANING – Before performing aqueous cleaning, parts
must first be cleaned with the acidic cleaning procedure outlined on page
15 to ensure the complete removal of any corrosion or scale. Final drying,
however, is not necessary.
NOTE: Use only LFW™ cleaning solution, which contains an additional
degreasing agent. White vinegar is not an acceptable cleaning agent for
EAN/ Nitrox pre-cleaning.
ULTRASONIC AQUEOUS BATH
CAUTION: It is important to carefully read and understand the Material
Safety Data Sheet (MSDS) for any cleaning solution before using it, in
order to understand the possible hazards associated with its use, and the
necessary precautions that must be followed to avoid them.
General Guidelines
▼It is important to select an aqueous cleaning solution that is non-carcino-
genic, non-toxic, and biodegradable, so that it can be safely disposed
of by emptying it into a sewer system that is connected to a waste
treatment facility. It must also be non-damaging to the materials of soft
wearing parts, including seats, O-rings, washers, and gaskets. Last, it
must be easily rinsed away so that it leaves no residue. Refer to Table
1 on Page 4, which lists the aqueous cleaning solution that Genesis
Scuba has currently approved.
▼The aqueous cleaning solution must be diluted only with distilled water,
according to the ratio specified by the manufacturer.
▼It is important to pre-heat the aqueous cleaning solution to
approximately 130º F.
▼The aqueous cleaning solution can be reused at least once, but will
eventually require replacement as more contaminants and particulate
matter are held in suspension. Frequently examine the appearance of
the previously used solution in a clear beaker, and compare it along-
side another beaker containing fresh solution in good lighting (diluted
with the same ratio of demineralized water). When the appearance
begins to vary between fresh and used, or when contaminants can be
visually detected, the solution should be disposed of and replaced with
new. Whenever in doubt, dispose of the solution and replace with
fresh.

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Atlas & Yukon Second Stage
1. Place the parts inside a clean dip basket and lower the basket into the
tank of a separate ultrasonic cleaner which contains an approved
aqueous cleaning solution. (Refer to Table 1 for an approved and
recommended solution, and follow the manufacturer’s instructions for
dilution rates and recommended working temperatures.) Be certain to
isolate more delicate parts, in order to prevent metal on metal contact
with other parts or the dip basket that can cause damage to sealing
surfaces.
2. Before removing the parts, it is important to don clean powderless latex
gloves in order to prevent any subsequent contamination with skin oils.
Avoid touching the external surface of the gloves with bare fingers in
the process of donning. Without this barrier present, parts will become
contaminated with skin oil.
NOTE: It is important to avoid handling clean parts with bare hands while
performing therinsing,inspection,andreassemblyprocedures. Doing so
will re-contaminate the parts with skin oil, and require them to be cleaned
again prior to reassembly.
3. With a small, nylon brush and lint-free swabs, scrub all surfaces of
each part, and allow to soak for an additional 5-10 minutes before
removing from the ultrasonic cleaner. Certain parts with complex
features may require more attention - especially those which contain
closed recesses and chambers. It is important to ensure that these are
thoroughly flushed with solution, and that contaminant residue is not
trapped inside.
Demineralized or Distilled Water Rinse:
NOTE: Tap water drawn from the faucet often contains high levels of
minerals, and is considered unsuitable for use with aqueous cleaning,
either as a diluent or final rinse. Inexpensive filtration systems may be
used which easily filter out most minerals, rendering the water “deminer-
alized.” For high volume operations, this is a less expensive alternative to
bottled distilled water.
1. When immersion in the aqueous cleaner has been completed, it is
extremely important to transfer all parts into a clean container filled
with fresh distilled or demineralized water that is heated to approxi-
mately 140˚ F, to facilitate faster drying. Rinse each part thoroughly
with mild agitation to ensure thorough rinsing and the complete re-
moval of cleaning solution. Parts with more complex features will re-
quire additional attention to ensure complete rinsing of threads, crev-
ices, and recesses.
2. Dry immediately afterward, using only low pressure (50 psi), hydrocar-
bon-free gas (Nitrogen or EAN).
3. When drying is completed, set the parts aside on a clean, lint-free
surface covered with butcher paper or cellophane.