Sherwood SRB3200 User Manual

REGULATORS

(SRB3300)

(SRB3400)

(SRB3500)

Assembly & Maintenance Guide

Includes

(SRB3200)

FIRST STAGE - MAGNUM®II SRB3300, BLIZZARD® SRB3200, OASIS® SRB3400

NOTE: The Oasis®+ SRB3500 uses the SRB3601 externally adjustable first stage. The parts breakdown and servicing of the SRB3601 is covered in the Oasis2/Blizzar

d Assembly & Maintenance Guide. Oasis®+ regulators manufactured in 1990 have the SRB3801 first stage with the DSS feature. The servicing of the SRB3801 first stage is covered in the Ultima SRB3800 Assembly & Maintenance Guide

. To determine the first stage of a particular regulator, compare the regulator with the pictures and diagrams in this guide as well as the other guides referenced above. For further information, contact your authorized Sherwood Distributor.

ITEM # CATALOG # DESCRIPTION

SRB3305 ........First Stage Complete

1 ....................3701-70 ......Handwheel

2......................3504-6 ........Star Washer Retainer

3......................1390-7 ........Filter

4.................29-3106-13A ....Moving Orifice

(bare, no o-rings etc.)

5 ....................3601-20 ......Moving Orifice Assembly

(with o-rings & washers)

6.................19-8010-8 ........Belleville Spring Washers (5 needed)

7 ....................G007A ..........O-ring (2 needed)

8 .............MS28774-007 ....White Backup Washer

9..................... 5705-20 ......Dust Cap

10.................. 1-1665-17 ......Yoke Nut

11 ................. 2-3801-4..........Yoke

12 .................2-3305-1 ........Body

13 ................... G904A ........O-ring (for H. P. port plug)

14 .................1-3405-4 ........H. P. Port Plug

15 ....................3106-6 ........One Way Bleed Valve

16...................1-3105-6 ........L. P. Port Plug

17 ....................G011B ........O-ring (for L. P. port plugs)

18 ....................G122A ........O-ring (seals cap to main body)

19 .....................3801-12B ....Main Spring

20..................19-6526 ..........Shim (to raise hose pressure)

21 ....................G007A ........O-ring (for small end of piston)

22 ....................3801-5 ........Piston Seat

23 ....................3107-10 ......Piston Assembly

(includes seat & O-rings)

24 ....................G022A ........O-ring (for large end of piston)

25.................. 2-3305-2 ........Cap

ORIFICE ASSEMBLY PARTS FOR BLIZZARD FIRST STAGE SRB3205

The following parts are the only parts that differentiate the Blizzard SRB3205 first stage from the standard Magnum II type SRB3305 first stage:

ITEM # CATALOG # DESCRIPTION

B1......................3504-6 ........Larger Star Washer (holds orifice in body)

B2 ...............J26005-43B ......Smaller Star Washer (holds filter in orifice)

B3 ..................18-3106-14 ....Filter

B4 ....................G011B ........O-ring (seals filter to orifice)

B5 ...............29-3106-13 ......Moving Orifice (bare, no O-rings etc.)

B6 ....................3106-9 ........Moving Orifice Assembly (with O-rings & washers)

B7 ..............64-8010-8 ........Belleville Spring Washers (4 needed)

TABLE OF CONTENTS

Page

1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

2.0 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

2.1 SRB3300 (Magnum II, SRB3400 (Oasis)

and SRB3500 (Oasis+) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

3.0 O-ring Reference Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

4.0 First Stage Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

4.1 Tools Required for First Stage Servicing . . . . . . . . . . . . . . . .5

4.2 Disassembly of First Stage . . . . . . . . . . . . . . . . . . . . . . . . . .5

4.3 Assembly of First Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

4.4 Testing of First Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

5.0 Second Stage Procedures . . . . . . . . . . . . . . . . . . . . . . . . .12

5.1 Tools Required for Second Stage Servicing . . . . . . . . . . . . . .12

5.2 Disassembly of Second Stage . . . . . . . . . . . . . . . . . . . . . . . .12

5.3 Assembly of Second Stage . . . . . . . . . . . . . . . . . . . . . . . . . .14

5.4 Set-Up of Second Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

5.5 Testing of Second Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

6.0 Helpful Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

6.1 Troubleshooting Regulators . . . . . . . . . . . . . . . . . . . . . . . . . .19

6.2 Parts Cleaning Recommendations . . . . . . . . . . . . . . . . . . . . .21

6.3 Commonly Used Cleaning Solutions . . . . . . . . . . . . . . . . . . .21

6.4 Handling Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

7.0 Two Year Warranty and Maintenance Information . . . . . . .23

7.1 Proper Procedure for Warranty Paperwork . . . . . . . . . . . . . .23

7.2 Scheduled Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

BEFORE YOU BEGIN.....

READ THESE INSTRUCTIONS COMPLETELY BEFORE YOU BEGIN SERVICING THE REGULATOR.

THESE INSTRUCTIONS ARE INTENDED FOR PEOPLE WHO HAVE BEEN AUTHORIZED BY SHERWOOD TO REPAIR SHERWOOD SCUBA EQUIPMENT. IF YOU ARE NOT SO AUTHORIZED - STOP.

1.0 INTRODUCTION

1. The procedures in this manual apply to the Sherwood Scuba MAGNUM II (SRB3300), OASIS (SRB3400), and OASIS+ (SRB3500).

The most current part numbers can be obtained by calling your Sherwood Sales Representative or Sherwood Scuba Customer Service.

All current Sherwood Scuba Regulators have service kits available which contain the parts which

must be changed at every annual service no matter what their condition. The standard

annual service kit for the Oasis, Oasis+, and Magnum is 4000-15. All other parts not contained in this kit must be inspected by the technician and changed under warranty

only if they have

failed due to problems with material or workmanship.

2. This manual gives breakdowns of regulator parts, equipment specifications, servicing instructions, troubleshooting recommendations, and guidelines for proper care of these regulators. This manual is intended for use

only by persons specially trained and authorized to

service Sherwood Scuba equipment.

3. Anyone attempting to service or repair Sherwood Scuba regulators

must have a thorough

understanding of the principles of operation of scuba regulators and valves, as well as the appropriate mechanical ability. The technician

must be properly trained in the safe use of

compressed air and the various tools and cleaning solutions involved in the procedures outlined in this manual.

4. The best source for current part numbers for any of the parts listed in this manual is your current parts and price list from Sherwood.

5. Because of the many unique features found in Sherwood regulators, Sherwood conducts seminars on a regular basis throughout North America to train technicians in proper service and repair procedures for all current Sherwood regulators. In addition, all Sherwood dealers and their staff members are encouraged to attend the seminars to gain an in-depth understanding of the construction, special features and operation of Sherwood regulators. For information on the dates and locations of upcoming Sherwood service seminars near you, contact your Sherwood Sales Representative.

NOTE

: You must be authorized by Sherwood to work on Sherwood Scuba equipment. You can obtain proper authorization by attending all appropriate seminars given in your area. This is the only way you can become an authorized Sherwood technician.

NOTE

: Oxygen Enriched Air conversion kits are available for all current Sherwood regulators and valves. The part number for the models covered in this manual is 4000-15N. These kits are to be installed into properly cleaned and prepared regulators only by technicians trained by one of the major oxygen enriched air training agencies.

WARNING

NEVER tighten the hose fitting to the first stage with more than 40 in. lbs. (4.5 Joules) of torque. The inlet hose fitting can be weakened by overtightening.

6. Companion instructional VHS videotapes to this and other Sherwood Scuba repair manuals are available from Sherwood Scuba at a nominal cost. Ask your Sherwood Scuba Sales Representative for details.

7. If you have any questions, or need more information, contact your Sherwood Scuba Sales Representative or Sherwood Distributor.

2.0 SPECIFICATIONS

2.1 SPECIFICATIONS FOR THE SRB3300 MAGNUM® II, SRB3400 & SRB3500 OASIS®

REGULATOR MODELS: Sherwood Magnum II SRB3300,

Oasis SRB3400 & SRB3500 AIR FLOW: 28-29 cu. ft. (793-821liters)/min. @ 1 atmosphere INHALATION RESISTANCE: 1.1” (2.8 cm) w.c. @ 1 atmosphere EXHALATION RESISTANCE: 0.8” (2 cm) w.c. max. @ 1 atm. RECOMMENDED LUBRICANT: LTI Christo-Lube

A. First Stage Regulator:

TYPE: Flow-by piston with Moving Orifice Balancing and

Dry Air Bleed - U.S. Pat. # 4,226,257 WEIGHT: 1 lb. 3 oz. (.54kg) INTERSTAGE PRESSURE: 135 -150 psi (9-10 bar) MAXIMUM INLET PRESSURE: 232 Bar for SRB3300CE, SRB3900CE,

SRB3400CE & SRB3500CE Models POSITIVE AIR PURGE FLOW RATE: 13-27 cc/minute # LOW PRESSURE PORTS: 4 (3/8”-24 UNF) # HIGH PRESSURE PORTS: 2 (7/16”-20 UN) MATERIALS: Body - CDA-360 Brass

O-rings - Buna-N

Bleed Valve - Ethylene Propylene

Piston Seat - Teflon

B. Second Stage Regulator:

TYPE: Downstream valve, diaphragm, Variable Fulcrum

- U.S. Pat. #3,991,785

WEIGHT: 7.6 oz. (.22 kg) ( w/o hose) HOSE LENGTH: 31 in. (.79 m) MATERIALS: Cover - Thermoplastic Vinyl

Case - Thermoplastic Triax

Poppet Seat - Buna-N

O-Rings - Buna-N

Diaphragm - Tufel®(black)

Exhaust Valve - Thermoplastic Elastomer (blue)

Mouthpiece - Liquid Silicone Rubber

Maximum certified depth is 50m

3.0 O-RINGS REFERENCE CHART

1. Before you begin disassembly of the regulator, test the first and second stages for output pressures and leakage. Pre-testing in this way will help the technician to pinpoint any specific problems requiring repair.

2. The work area must be clean and well lighted, with clean compressed air available to blow sand and dirt from parts.

G907A

Seals second stage orifice to case

G022A

Large End of piston

G122A

Seals cap to body

G007A

Moving orifice, small end of piston

G0101A

Outlet end of hose

G011B

L.P. port plug, inlet end of hose

G904A

Under filter in first stage H.P. port plug

4.0 FIRST STAGE PROCEDURES

4.1 TOOLS REQUIRED FOR FIRST STAGE SERVICING

– Bench vise

– 3/32" Allen wrench

– 5/32" Allen wrench

– 6" or 8" adjustable wrenches

– 15" adjustable wrench

– Phillips screwdriver

– #10 Torx screwdriver

– Sherwood 50 cc Graduated Cylinder (p/n TL110)

– Sherwood Piston Seat Removal Tool (p/n TL112)

– Sherwood Plastic Probe (p/n TL111) to push out orifice

– Sherwood Regulator Support Handle (p/n TL113)

– Sherwood Intermediate Pressure Gauge (p/n TL119)

– Sherwood Inlet Filter Installation Tool (p/n TL115)

– Sherwood O-ring Installation Cones:

Brass-colored - p/n TL106 ( for installing small O-ring on piston tip ) Green-colored - p/n 38-TL107 ( for installing 1st O-ring onto moving orifice ) Black-colored - p/n 29-TL108 ( for installing 2nd O-ring onto moving orifice )

– Sherwood Oxygen Compatable Lubricant (Crystolube LTI) p/n SW-MS150

4.2 DISASSEMBLY OF FIRST STAGE

To view all the parts used in the first stage, fold out the front cover of this manual. The circled numbers below refer to the corresponding numbers on the drawing.

1. Use 6” or 8” adjustable wrenches to disconnect all hoses from the first stage. Pull back the hose protector from the inlet end of the hose. Inspect the hoses for wear. Pay particular attention to the area where the metal ferrules meet the rubber hose material. Replace hoses if necessary.

2. Unscrew and remove the handwheel .

3. Remove the dust cap .

NOTE

: For more information on Sherwood tools and their uses, see Sherwood’s Tools, Repair Kits and

Accessories - Assembly & Maintenance Guide, available from Sherwood.

4. Use a 5/32” Allen wrench, and a small adjustable wrench to remove all port plugs and hoses from the body.

5. Install a Sherwood regulator support handle (p/n TL113) into one of the low-pressure ports. Use the support handle and a 15” adjustable wrench or bench vise to loosen the yoke nut from the body . See Photo #1.

6. Remove the yoke and yoke nut from the body.

7. Use the Sherwood regulator support handle and a 15” adjustable wrench or a bench vise to remove the cap from the main body.

8. Remove the spring any shims and the piston assembly from the cap. Remove both piston O-rings and discard them.

9. Remove the piston seat by pushing through the stem with the Sherwood piston seat removal tool (p/n TL112) from the large end. The seat will then pop out. Discard the old seat.

Photo #1

NOTE

: If a Sherwood DIN adapter (p/n SAA5200, or SAA5300) is installed in place of the more common yoke assembly, remove it at this time. See Sherwood Technical Bulletin #104 for servicing procedures for the DIN adapter.

+ 19 hidden pages