Sherwood Scuba Oasis User manual

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SRB9750 | SRB9950
OASIS & BLIZZARD
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SECOND STAGES
SERVICE GUIDE

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INTRODUCTION
The instructions set forth in this document are intended to guide the experienced scuba equipment repair technician
through the standard service procedure for this Sherwood regulator.
It is assumed that the technician possesses basic scuba equipment repair training, proper tools and the skill
necessary to perform the service. If you have not received regulator service training provided by Sherwood Scuba
specifically for this equipment, do not attempt to perform the service described in this document.
Before attempting to perform service read this manual in its entirety. There are warnings and cautions contained in
the manual that may affect your own safety or the safety of the regulator user.
If you are uncertain as to whether or not you are qualified to perform this service contact your regional Sherwood Scuba
Distributor for technical assistance.
Service parts for Sherwood equipment are sold only to Authorized Sherwood Dealers.
USE OF WARNINGS, CAUTIONS AND NOTES
REGISTRATION, INSPECTIONS AND SERVICES: ON-LINE REGISTRY.
All Sherwood regulators have to be registered right after purchase, either by the end consumer or the dive center where
the item was acquired. If the dive center is not able to register the product for the end-consumer at the time of purchase,
the sales associate form the dive center has to strongly encourage the end-consumer to register the product within
30 days after purchase.
Effective immediately: recording inspections and services is required to ensure the proper continuity of the warranty pro-
cess. Regardless of location, proper record keeping by the authorized dealer is required right after each inspection or
service is performed.
When the regulator is going to be used for recreational purposes a year or 150 dives after purchase an inspection is re-
quired; a year after such inspection or when the regulator has completed 300 dives a full service is required. Time frames
may be different when the regulators are going to be used for public service, institutional, rental or instructional use. Please
contact your local Sherwood Sales representative for additional information to discuss particular cases and usage.
Recording Inspection or Service events at our website:
Go to http://www.sherwoodscuba.com & using your dealer credentials click on the Product Warranty tab and follow the
instructions to record Inspection or Service. It is imperative that the Authorized Dealer record such events:
WARNING: Indicates a potentially hazardous condition or situation which, if not avoided, may
result in serious injury or death.
CAUTION: Indicates a potentially hazardous condition or situation which, if not avoided, may
result in minor injury. It may also be used to alert against unsafe practices.
NOTE: Indicates an important point or reminder.

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ANNUAL INSPECTION - GENERAL GUIDELINES FOR 1ST AND 2ND STAGES -
1. Visually inspect the first and second stage for signs of damage or deterioration. Mouthpieces with tears or other damage
should be replaced.
2. Retract hose protectors and inspect the hose over its entire length for signs of damage including blisters, deep cuts or
separation at the crimped fittings. If these signs are present the hose must be replaced and standard service overhaul is
recommended. Very small hairline cracks on yellow hoses, could be acceptable; consult with Technical Services if in doubt.
3. Insert a soft probe through the exit port of the exhaust cover and lift the Exhaust Valve to inspect it for cuts, tears or highly
contaminated surfaces. Perform this examination from both sides of the Exhaust Cover to observe the entire perimeter
of the Exhaust Valve. If damage to the Exhaust Valve is found a complete overhaul is recommended.
If the Exhaust Valve or the sealing surfaces on the Housing are contaminated with debris, the Exhaust Cover must be
removed and the surfaces must be cleaned. Instructions for removing and replacing the Exhaust Cover appear in the
Second Stage Service Guide. As a final check of the Exhaust Valve apply a moderate suction (approximately minus 5
inches of water, (moderate inhalation effort) to the second stage mouthpiece with the air supply closed and the second
stage purged. If leakage is detected a complete overhaul is recommended.
4. Inspect the first stage filter for evidence of contamination. Discolored or stained filters indicate previous contact with
contaminated air. If evidence of contamination is present it is recommended that a standard overhaul be performed.
In addition, you should advise the customer (Or main DSO from your institution) that the regulator has been exposed
to contamination and that previously used air cylinders should be inspected.
5. Install an intermediate pressure gauge into one of the available LP ports.
6. Pressurize the regulator to approximately 500 psi and inspect for leakage. Note intermediate pressure. It should not be
greater than 155 psi. If no leakage is detected increase inlet pressure to 3000 psi. Again check intermediate pressure.
It should not exceed 155 psi. If intermediate pressure is out of range (145 +/- 10 psi) or leakage is present a standard
service overhaul is recommended.
7. Test the purge function. If there is not a strong surge of air, a standard overhaul is recommended.
8. Gently submerge the entire regulator and look for bubbles that indicate leakage. If leakage is present a standard overhaul
is recommended.
9. If a test bench is available perform an inhalation test. Each particular 2nd Stage has its own O.E values but, in general,
the inhalation effort should not be greater than 2.0 inches of water at opening and less than 5.0 inches of water at 15
SCFM. If a test bench is not available perform a subjective breathing test. When properly adjusted the regulator should
provide smooth and easy inhalation. If difficulty with inhalation or exhalation is suspected a standard overhaul is
recommended.
WHEN TO SERVICE
Sherwood regulators are designed and tested to perform acceptably under typical recreational diving conditions up
to 300 hours of use.
Sherwood regulators should be inspected at least annually to evaluate their performance. In most cases a simple Intermediate
Pressure and Breathing Effort inspection should be sufficient and, if needed, minimal adjustment not requiring parts’ replacement
could be acceptable.
If the regulator has been subjected to more than 300 hours of use or it has not received the benefit of careful post-dive cleaning
and storage in a clean environment, a standard service overhaul is required.
In any case, the Sherwood regulator described in this manual should receive a standard service overhaul at least every two years
to maintain optimal performance. The standard service overhaul most include disassembly, cleaning, inspection, replacement
of consumables, lubrication, reassembly and adjustments. Specific steps for the mentioned service are fully described within this
manual.
Regulators that are used in extreme conditions, such as commercial or institutional use or rentals will require more fre-
quent service overhauls of at least every 3 to 6 months, consult with Sherwood’s technical support if in doubt about this subject.
Sherwood Scuba offers a standard service kit that contains the parts recommended to be replaced in connection with the standard
service overhaul.

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GENERAL COMMENTS
1. Read the entire set of procedures that follows before starting to service. Steps taken out of sequence or without
the knowledge of the proper procedure could damage the regulator or otherwise complicate the service process.
2. Refer to the Illustrated Parts List while performing service. Each part is identified with an item number the first
time it appears in the text. Parts that are to be replaced with new parts in conjunction with an overhaul have
encircled reference numbers. A copy of the schematics for this regulator is included at the end of the manual.
3. Do not attempt to reuse parts that are designated for replacement. Retain discarded parts to show to the
customer to illustrate that a full overhaul service has been completed.
4. Work in a clean properly equipped area. Cleanliness is essential for all regulator servicing and is critical for
regulators that will be exposed to enriched air mixtures (Nitrox). Do not attempt to service if all required tools
and a clean work area are not available.
5. Work on one regulator at a time taking care not to mix parts from other regulators. Use only genuine Sherwood parts.
Parts that appear similar may have different specifications that are not easy to detect and may cause malfunctions.
6. Be careful to protect the finish on all surfaces of the regulator during the service procedure. When holding parts
in a vise use soft or padded jaws to prevent defacing surfaces.
7. O-rings are classified by the service they perform and are identified as either static or dynamic. Dynamic
O-rings are those that are subjected to movement and the effects of friction which tend to shorten the useful life
of the O-ring. Static O-rings are used to create a seal between non-moving parts and are not subject to the
same wearing effects. Static O-rings have a longer useful life and are not replaced unless they show signs of
deterioration or brittleness. Careful inspection of these O-rings is required before they are returned to service.
Lubrication of O-rings:
a. All lubrication must be done with Tribolube 71 or Christo-Lube MCG-111.
b. General – O-rings in most instances should receive only enough lubricant to en
sure they are supple. A light coating of lubricant should present a surface that shines
but without a defined layer of lubricant visible.
c. Ample – When an ample application of lubricant is specified it generally applies
to a dynamic O-ring subject to considerable motion or environmental conditions
where a more generous application of lubricant might be essential. In this
situation there should be a light film or layer of lubricant visible.
8. When removing O-rings or Backup Rings use a plastic or a soft brass tool to lift the item out of its groove. Do not use
steel or other hard tools that might scratch sealing surfaces.
9. When instructed to use tools such as a hex key or a wrench, follow the standard convention to rotate clockwise
to tighten and counterclockwise to loosen unless otherwise directed.
10. When instructed to tighten a part until snug, it means to tighten it just until the part stops moving freely and
the force required to advance it further rises considerably. When specific torque specifications are given there
is a necessity to ensure that the part is tightened enough to retain position or to create a seal. A Torque Wrench and
proper sockets should be used at any point where a torque specification is mandated. Excessive torque may damage
parts and will require those to be replaced & insufficient torque could lead to a catastrophic failure.
Please DO NOT just use wrenches, ratchets or breaker bars for final torque during REASSEMBLY.
General Ample
NOTE – Read this section before attempting to perform service.

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ENRICHED AIR NITROX SERVICE
The Sherwood regulator presented in this manual has been designed and manufactured to allow the use of Enriched
Air Nitrox (EAN) gas with an oxygen component not to exceed 40%.
In order to maintain this option the user must ensure that the regulator is protected from the introduction of
hydrocarbons. The introduction of hydrocarbons into the regulator may increase the risk of fire when used with EAN.
When servicing the regulator, the technician must be aware of this requirement and exercise caution not to
contaminate the regulator with hydrocarbons (Petroleum based greasy substances). This requires a clean workplace, free
of oil, grease, debris and other contaminants. Additionally in order to return the regulator to recreational EAN service,
the overhaul procedure must have a cleaning provision to remove all hydrocarbons before the regulator is reassembled.
Do not substitute parts or use lubricants other than Tribolube 71 or Christo-Lube MCG 111. Silicone lubricants are not
acceptable and increase the risk of a fire hazard.
On the other hand please also be aware that despite all this recommended precautions and lubricants, none are intended
to be used in conjunction with EANx concentrations higher than 40% such as the ones required during Technical Diving.
FACILITY REQUIREMENTS
The service facility is perhaps the most important asset of any professional dive store. It should be clean, 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 Padded 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. Vise must be lined with soft material like rubber or wood. Be sure to follow the instructions provided in this
manual.
• Magnification Lamp - Strong lighting and magnification are essential requirements for performing a thorough parts
inspection - 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 over-tightening or under tightening a part. This is especially important for smaller parts and
fittings, when over-tightening can easily damage the part. Do not use standard wrenches for final torque.
• Calibrated Foot-Pound Torque Wrench - Torque wrenches that can be set for both inch-pound and foot-pound mea-
surements generally tend to be less accurate than wrenches that are designed to measure torque within a specific
range. Do not use standard wrenches for final torque.
• Manufacturer’s Specialty Tools - Specialty tools are critically important to performing each step of disassembly and
reassembly according to each manufacturer’s procedures. During the mentioned steps where the procedure clearly
indicates the use of a specialty tool, Sherwood Scuba strongly discourages technicians the use of substitute or
make-shift tools to perform such steps. Sherwood specialty tools are required to perform service are listed on the fol-
lowing page.
WARNING – The introduction of hydrocarbons, lint, dirt and other contaminants into the areas of
the regulator subjected to high pressures (greater than 500 psi) and EAN mixtures containing more
than 40% oxygen may constitute a fire hazard and may subject the user to serious injury.

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RECOMMENDED TOOLS AND SERVICE KIT
The specialty tools identied below may be purchased from your Sherwood Scuba Distributor. Common tools are
available from several sources.
Common Tools
Open End Wrenches - 11/16”, 5/8”, 9/16”
Socket 11/16”
Hex Key Tool w/ multiple sizes
Crow’s Foot Wrench - 5/8”, 9/16”
Torque Wrench - 60 in/lb (10 Nm)
Diagonal Pliers (wire cutters)
Flashlight
Compressed Air Gun
O-ring picks, plastic and soft brass
Magnier or Stereoscopic microscope
Specialty Tools
Orice Driver 20-675-200
O-ring pick set, soft brass G9440-22
In-Line Adjustment Tool 20-500-200
5-piece set Picks/ Flat Screw Drivers 11-090-500
Blizzard Pro Nut Driver/Poppet Tool 20-612-200
2nd Stages Service Kit Components (Contained in kit 9950-PK)
0
0 100mm
1 2 3 4
9950-PK
(OasisPro BlizzardPro 2nd stages)
970010 (x2)/
Orifice, Hose Swivel
970015/
Venturi Switch
Rev. 2018.07.26
SHV7030 (LP Seat)
SHV7026 (Plastic Tie Wrap)
9000-47 (Poppet Nut)
O-ring/Position
Oasis Pro & Blizzard Pro SECOND STAGES
SECTION

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CAUTION – When performing the next step to remove the Purge Cover be careful to avoid placement
of the probe or screwdriver between the Housing and the Diaphragm Retainer. Placing the tool
incorrectly, prying upwards or too forcefully may increase the risk of damage to housing, diaphragm
or the other components requiring their replacement.
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1. Use a 3/4” (19mm) open end wrench to stabilize the inlet connector (9) and a 5/8” (16mm) wrench to rotate
the hose fitting nut counterclockwise to separate the hose assembly (26) from the inlet connector.
2. Remove the tie wrap (17) and mouthpiece (25).
SECTION
DISASSEMBLY PROCEDURE
CAUTION – When performing the next step to remove the Purge Cover be careful to avoid placement
of the probe or screwdriver between the Housing and the Diaphragm Retainer. Incorrect placement of
the screwdriver may increase the risk of damage to the Diaphragm requiring replacement of the part.
2. Remove tie wrap (3) and mouthpiece (31).
2
1
1. Retract Hose Protector (30) and use a 5/8”
open end wrench to rotate the hose tting nut
counterclockwise to separate the hose assy
(28) from the valve body’s threaded end.
SECTION
Oasis Pro & Blizzard Pro SECOND STAGES - DISASSEMBLY PROCEDURES

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3. Locate notch at the bottom of the
housing (33) and start inserting a small
at screwdriver in between the Purge
Cover’s lip (32) and the housing.
5. While holding the cover with opposite
hand use the screw driver on a constant
circular motion to facilitate the purge
cover’s lip separation from the
regulator’s housing.
7. Align the plastic clip (4) with the housing molding mark to facilitate extraction.
Ensure at screw driver’s tip is placed on the clip’s notch before applying any force.
3
5
4
6
7
4. Carefully continue inserting the screw driver until it passes through one
of the openings at the top of the purge cover. Use that orice area as a
pivoting point for the next step. DO NOT pry up forcefully with tool.
6. Separating the purge cover will provide access to the Accent Ring (9),
Diaphragm Retainer (10) and Diaphragm (34) to remove them.
CAUTION – Failure to extract
the clip at an angle will increase
the risk of breaking it.

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8. Pull clip upwards and at an angle until it gets completely
o the Venturi Switch (8).
11. Collect the Poppet Nut (17), Poppet Washer (11) and Demand Lever (13), discard Nut and set aside the other
components for cleaning and inspection.
8
10
11
9
9. Extract Venturi Switch (8) from
housing..
10. Using any ¼” nut driver or 20-612-200 Blizzard Pro Nut Driver remove Poppet Nut (17) by rotating it
counterclockwise. At the same time, slightly push down the Demand Lever (13) to ensure index features from
both Poppet (19)and Valve End (24) coincide, preventing poppet from rotating, and facilitating the nut extraction.

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12. Using a 11/16 open end wrench remove the Retaining Nut (14) and pull out the Retaining Washer (15).
13. Carefully push the partially disassembled Valve Body inwards, collect the o-ring (6) that will likely fall o after it loses
contact with the Valve Body.
14. Remove the partially assembled Valve Body and Valve Flange (23). Place all the components on a safe place for
cleaning & inspection.
12
13
14

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15. Using Orice Driver 20-675-200 unthread the orice (20) by rotating it counterclockwise until it is only spinning. This
will release some of the pressure from the spring loaded components inside facilitating removal at a later step.
16. Using a small knife make an incision on the valve end coinciding with the setting screw. This will later be used during
reassembly as alignment mark to ensure the correct positioning of the valve end in relationship with the rest of the
valve body.
15
CAUTION – The following step is crucial to ensure a proper demand lever
alignment during reassembly. Failure to create the below mentioned alignment
mark will make reassembly more dicult, possibly damaging parts and making
the demand lever alignment incorrect. Be aware that it is also possible that the
mentioned alignment mark has already been made on a previous service, if that
were the case, it will not be necessary to make another one.

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16. Using a #0 Phillips screw driver remove the setting screw from the valve body. Ensure you place your nger over and
then aim the valve end against a hard surface to prevent the spring loaded components from being projected o the
valve body.
16
18
18. Using a plastic probe remove orice by pushing it o the valve body.
17
17. Extract all the components and set them aside for cleaning and inspection.

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19
19. Using a curved pick remove LP seat from poppet.
Discard used LP seat.
20. Remove o-ring (26) from Orice (20) using a soft material pick. Discard the used o-ring.
20

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21. Using a Phillips screwdriver remove the Exhaust Tee screws (1). If working on Oasis those screws also hold the Vanes
(35 & 36), carefully remove those and place them on a safe location for later inspection & re-assembly.
22. Remove Exhaust Tee (2) from the back of the housing.
21
22
23. Remove Valve (5) by pinching both ends,
& carefully elongating it and pulling it
outwards carefully.
23
NOTE – The following steps (21 – 23), to remove the exhaust tee and exhaust valve are ONLY
required when the regulator is excessively dirty or the exhaust valve is suspected to be
damaged and needs to be replaced or when replacing damaged vanes (Oasis Pro). These steps
are NOT necessarily required on every single overhaul. Exert caution to avoid thread damage.

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CLEANING:
24. Thermoplastic, silicone rubber and anodized aluminum parts, such as diaphragms, accent trim, adjustment
knobs, static/ replaceable O-rings, and thermoplastic housings.
a. Soak in a solution of warm water and ordinary liquid dish detergent. Scrub with a soft nylon bristle brush
to remove deposits.
b. Do not subject thermoplastic or rubber parts to ultrasonic cleaning or vinegar solutions.
c. Rinse with fresh water and blow dry with clean low pressure compressed air.
25. Chrome-plated Brass and Stainless Steel parts only – Use a commercial grade Ultrasonic Cleaner with LFW
(Lawrence Factor Wash). LFW should be used diluted at a concentration no higher than 1:4 LFW/Water ratio
to ensure good penetration, mineral build up removal and also ensuring chrome plating protection. (Follow
manufacturer’s recommendations for your particular ultrasonic cleaner brand).
A heated ultrasonic cleaner will accelerate the cleaning process; most mineral buildup on heavily soiled
metallic parts can be cleaned with a 10–15 minute treatment with LFW diluted to 75% on a heated ultrasonic
cleaner.
Alternatively the use of household vinegar or warm water and a brush could be considered as a method to
clean metallic parts but be mindful that such processes may not go to deeper ends of some metallic parts
such as small inner threads, channels, sealing surfaces, etc, and corrosion build up may remain. The use of an
ultrasonic cleaner proves valuable when sealing or friction surfaces can’t be reached easily.
Regardless of the method used, rinse all metallic parts right after the cleaning process thoroughly with fresh
water and blow them dry with compressed air.
26. Hoses -
a. Corrosion or mineral deposits on the metallic ttings on hoses may be cleaned using the procedure
presented above provided that care is taken to dip only the metal ttings at each the end of the hose
into the cleaning solution. Take care to prevent access of the solution into the hose inner conduit.
b. Rinsing should include ushing the interior of the hose with fresh water followed by drying with com
pressed air.
WARNING – When heavy corrosion has developed, metallic parts will lose their chrome-plating after
time. The use of an ultrasonic cleaner (next step) may accelerate such loss and chrome “peeling”
will develop. If the parts you are intending to clean using an ultrasonic cleaner present excessive
mineral build up, be cautious and continue monitoring the parts immersed in the solution cleaner
periodically. Start the process by using the ultrasonic cleaner for only 1-2 minutes, extract the part
(s), observe and evaluate the chrome-plating nish for signs of peeling.
WARNING – If after a preliminary cleaning (1-2 min) metallic parts present heavy pitting and
substantial damage, particularly to sealing surfaces it is advisable to replace the whole part after
the evaluation.
SECTION
2nd STAGES - GENERAL CLEANING AND INSPECTION PROCEDURES

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INSPECTION:
27. Carefully inspect sealing surfaces on all parts where o-rings make contact. These surfaces must be free of
contamination, scratches and blemishes to eectively seal against o-rings.
28. Inspect seating surfaces on rst and second stage orices; these must be free of nicks, deep scratches and
blemishes in order to seal properly.
29. Inspect the integrity of the Diaphragm (34) and Exhaust Valve (5) by stretching them slightly while watching
the material against the light. Ensure they do not have cuts or deformities & replace if needed.
30. Ensure you spend sucient time during the inspection and pay special attention to the physical integrity of
all components, if you have questions contact your regional distributor.
NOTE – Steps 31 – 32 are only required if the Vanes/ Exhaust Cover / Exhaust Tee were removed
during disassembly.
31. Slight lubrication at the insertion area beforehand may be benecial to avoid damage to exhaust valve’s tip.
Install exhaust valve by inserting it’s tip through housing’s rectangular slot at the middle of the grill
(insertion area) then pinch it and pull it slowly until it passes through. Run nger around and ensure valve
sits evenly.
31
SECTION
Oasis Pro & Blizzard Pro - REASSEMBLY PROCEDURES
NOTE – Blizzard Pro is the only one with Blue Exhaust Valve (SHV7078) and Oasis Pro is the only one
with Moisture Retention Vanes (SHV5071 & SHV5071).

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32. Replace Exhaust Tee cover and thread the screws avoiding over-torque. Blizzard Pro model only requires
screws & is the only one that uses a blue exhaust valve PN# SHV7078. Oasis Pro requires the vanes to be
secured with the same screws as well; ensure grilled vane goes on top and at vane goes on bottom.
32

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33. Install Poppet Guide & Spring Bushing.
37. Place valve end over poppet and washer over threaded end ensuring washer
soft end is pointing downwards, to later friction against demand lever cams.
33 34
34. Note the correct orientation of Poppet Guide (21) and
ensure bushing soft surface is oriented upwards.
36
35. Install spring (22).
38. Install a new lock nut w/ rounded
side facing upwards. Thread by
hand only a few turns..
35
36. Note the square features from both the poppet’s tip and the valve end.
Those must coincide when assembled to prevent poppet from rotating.
3837

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39
39. Push down the Valve End so more of the poppet’s threads are exposed. If square features do not coincide, while
placing poppet against a rubber mat to prevent sliding, slightly rotate valve end and push down again until poppet
and valve end locked up against each other and poppet does not turn. Repeat until parts coincide. Simultaneously,
while holding down the valve end, use a 1/4” nut driver to thread the nut until one thread of the poppet’s tip is visible
passing the nut’s surface. Do not thread any further.
40. Insert a new LP seat (12) from service
kit.
40
41. Insert assembled components inside
the valve body..
41

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WARNING – It is imperative that the valve end is correctly aligned in relationship with the valve body
using the index mark created in Step 16. Failure to do so will cause damage to the valve end and
potentially could also cause the demand lever to be o center compromising the regulator’s function.
45
45. Locate Valve Flange (23) and insert it into housing ensuring the outer square feature is secured against housing.
42. Align index mark created in step
16 w/ orice on valve body...
42
43. Push valve end against valve body until the index ring reaches
the valve body’s shoulder. Ensure proper alignment before
next step.
43
44. Using #0 Phillips screw driver thread the retaining screw (25) clockwise until it bottoms. No excessive resistance
should be noticed while threading, if it does stop and correct alignment. Only light hand tight force is required.
44