® REGULATORS ® ® (SRB5300) (SRB5900) ™ (SRB5100) ® (SRB5700) Assembly & Maintenance Guide
FIRST STAGE - OASIS™ SRB5700, BLIZZARD™ SRB5900, MAGNUM® SRB5300, BRUT™ SRB5100 To determine the first stage of a particular regulator, compare the regulator with the pictures and diagrams in this guide. The model number of the regulator is laser stamped on the first stage between two of the outlet ports. For further information, contact Sherwood at 1(888) 50-SCUBA. ITEM # 1 2 3 4 CATALOG # . . . . . . . . . . .5105-70 . . . . . . .J2790056B . . . . . . . . . . . .1390-7 . . . . . . . .29-5305-4 . . . .
TABLE OF CONTENTS Page 1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 2.0 2.1 2.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 SRB5700 (Oasis), SRB5900 (Blizzard), SRB5300 (Magnum) . .3 SRB5100 (Brut) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 3.0 O-rings Reference Chart . . . . . . . . . . . . . . . . . . . . . . . . . . .5 4.0 4.1 4.2 4.3 4.4 First Stage Procedures . . . . . . . . . . .
1.0 INTRODUCTION 1. The procedures in this manual apply to the Sherwood Scuba SRB5900 Blizzard, SRB5700 Oasis, SRB5300 Magnum and SRB5100 Brut regulators only. The older SRB3900 Blizzard, SRB3700 Oasis, SRB3300 Magnum and SRB2100 Brut regulators have different part and service procedures. They have their own manuals that are to be used for guidance during their servicing (Part Numbers T-SC07A93 and T-SC07B93).
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 Scuba Customer Service.
2.0 SPECIFICATIONS 2.1 SPECIFICATIONS FOR THE SRB5900 BLIZZARD, SRB5700 OASIS, AND SRB5300 MAGNUM REGULATOR MODEL: AIR FLOW: INHALATION RESISTANCE: EXHALATION RESISTANCE: RECOMMENDED LUBRICANT: A. First Stage Regulator: TYPE: WEIGHT: INTERSTAGE PRESSURE: MAXIMUM INLET PRESSURE: POSITIVE AIR PURGE FLOW RATE: # LOW PRESSURE PORTS: # HIGH PRESSURE PORTS: MATERIALS: B. Sherwood SRB5900 Blizzard, SRB5700 Oasis, SRB5300 Magnum 33 cu. ft. (935 liters)/min. @ 1 atmosphere .9" (2.3 cm) w.c @ 1 atmosphere 0.
2.2 SPECIFICATIONS FOR THE SRB5100 BRUT REGULATOR REGULATOR MODEL: AIR FLOW: INHALATION RESISTANCE: EXHALATION RESISTANCE: RECOMMENDED LUBRICANT: A. First Stage Regulator: TYPE: WEIGHT: INTERSTAGE PRESSURE: MAXIMUM INLET PRESSURE: POSITIVE AIR PURGE FLOW RATE: # LOW PRESSURE PORTS: # HIGH PRESSURE PORTS: MATERIALS: B. Sherwood SRB5100 Brut 30 cu. ft. (850 liters)/min. @ 1 atmosphere 1" (2.5 cm) w.c @ 1 atmosphere 0.7" (1.8 cm) w.c. max. @ 1 atm.
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.
4.0 FIRST STAGE PROCEDURES 4.
4. 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 9 from the body 13 . See Photo #1. Photo #1 5. Remove the yoke 10 and yoke nut 9 from the body. 6. Use a 5/32" Allen wrench to remove all remaining port plugs 12 16 from the body. 7. Use the Sherwood regulator support handle and a 15" adjustable wrench or a bench vise to remove the cap 26 from the main body.
CAUTION If any grease or oil gets on the flow control element assembly, the air flow will be impeded. Photo #2 NOTE: If no air is bubbling from the one-way bleed valve, this is a good indication that the positive air purge system is not working. 11. Use a pocket screw driver to remove the black washer 17 that was beneath the element assembly. Save this washer as it can usually be reused. Be careful not to scratch the metal surface under the washer. 12.
The sealing surface on the body where the one-way valve seals must be totally clean of deposits. If any deposits remain on the sealing surface after initial cleaning, take a fine abrasive polishing stick or a pencil with a new eraser and polish the surface to remove deposits (see Photo #3). Photo #3 15. Blow all residue from the body after polishing. 16. Remove the large O-ring 26 from the cap. This O-ring can usually be reused. 17.
4.3 ASSEMBLY OF FIRST STAGE 1. The part number for each regulator kit can be found in Sherwood’s Tools, Repair Kit and Accessories – Assembly & Maintenance Guide. The kits contain the parts that are always replaced at every annual service interval. The kit number for the regulators covered in this manual is 4000-15. 2. Before installing new O-rings on the piston and moving orifice, lubricate the O-rings with LTI Christo-Lube.
16. If the first stage has a SAA-5300 DIN adapter installed instead of a standard yoke, see the installation instructions given in Sherwood Technical Bulletin #104 for overhaul and installation instructions of the DIN adapter. 4.4 TESTING OF FIRST STAGE NOTE: For safety, always test the first stage regulator with at least one second stage installed.The demand valve on the second stage acts as a relief valve in the event of a malfunction. A. Before You Begin Testing 1.
C. Intermediate Pressure Test NOTE: This test determines the regulator’s lock-up pressure (the pressure put out by the first stage during a no-flow condition). 1. Attach any Sherwood second stage to one of the low pressure ports, and the Sherwood intermediate pressure gauge (p/n TL119) to another low pressure port. Plug all other ports with appropriate port plugs. 2. Attach the regulator to a tank valve giving a source pressure of between 2700 and 3500 psig (186 and 240 bar). 3.
5.0 SECOND STAGE PROCEDURES 5.1 TOOLS REQUIRED FOR SECOND STAGE SERVICING – Two good quality 6" or 8" (15 or 20 cm) adjustable wrenches – #10 Torx screwdriver – Side cutting pliers – Sherwood In-line Adjusting Tool (p/n TL102) – Sherwood Plastic Probe (p/n TL111) to push out orifice – Sherwood Lever Height Adjusting Tool (p/n TL123) 5.2 DISASSEMBLY OF SECOND STAGE WARNING NEVER tighten the hose fitting to the first stage with more than 40 in. lbs. (4.5 joules) of torque.
9. Use the Sherwood in-line adjusting tool (p/n TL102) to back the adjusting orifice out of the orifice housing until the threads disengage. Remove the in-line adjusting tool, and push the adjusting orifice the rest of the way out of the orifice housing with the Sherwood Plastic Probe (p/n TL111). 10. Remove the O-ring 21 from the adjustable orifice. 11. Before removing the exhaust valve 14 from the case, bend it over as far as it will go from the top, bottom, left, and right sides.
corrosion. Corrosion or minor scratches can be polished out using a fine-grit rubberized polishing stick or a clean new pencil eraser. Do not apply heavy pressure when rotating the polishing stick. Stop polishing immediately after the corrosion or scratch disappears. An orifice will not be accepted for warranty replacement simply because it is dirty or corroded. The technician must clean the orifice sealing surface at every service interval. 19.
8. Tighten the screws using a # 10 Torx screw driver just enough to seat them snugly. There is no reason to turn these screws beyond the first contact point. Do not overtighten. This screw is threading into plastic, which will hold well in service but is easily stripped if overtightened. 9. Install the mouthpiece 17 . Be sure to position the mouthpiece so that the word “Sherwood” is on the top. 10. Install a new mouthpiece tie 18 . 11.
Photo #4 7. Look across the case and gauge tool. The tip of the lever should be even with the bottom surface of the gauge. If you are re-using the same major parts of the regulator, this measurement will most likely be correct, and no adjustment will be needed. In fact, bending the lever should be avoided unless necessary to get the tip of the lever in the proper position. 8.
11. Replace the diaphragm. Continue to test the gap between the lever and the diaphragm after each bending until the lever is in the correct position. 12. Return to Section 5.3.4 of this manual to complete assembly of the regulator. 5.5 TESTING OF SECOND STAGE A. Inhalation Effort Check the inhalation effort of the second stage with a pan of water about five inches deep. 1. Slowly immerse the second stage with the front cover down and level.
D. External Air Leaks 1. Attach the regulator first stage to a tank short enough to totally submerge the first and second stage in your filling station cooling water. 2. With the tank valve still turned off, flood the second stage completely with water, and then position it mouthpiece up. 3. Turn the tank air valve on slowly and then watch for any leaks in the first or second stage (except for the normal flow of air from the one-way bleed valve on the first stage). 4. 5. Repair any leaks.
6.0 HELPFUL HINTS 6.1 TROUBLESHOOTING REGULATORS POSSIBLE CAUSE RECOMMENDED ACTION A. High Inhalation Effort at Depth: 1. Inlet filter clogged. Replace the filter. 2. No air flowing through the dry air bleed system. Check the flow rate coming out of the one-way bleed valve 15 . If no or low air flow is detected, clean the flow element in the piston, or replace the piston. 3. High pressure air supply insufficient. Verify the supply air pressure.
C. Wet Breathing: 1. Improper clearing, or diver diving in total head-down position. Instruct the diver on proper clearing technique. 2. Diaphragm improperly installed. Visually check position of diaphragm. 3. Hole in the mouthpiece at tie area. Replace the mouthpiece. 4. Hole in the diaphragm. Replace the diaphragm. 5. Damaged exhaust valve, or edges of the exhaust valve not firmly seated on the case. Replace exhaust valve. 6. Crack in case. Replace case. D.
6.2 PARTS CLEANING RECOMMENDATIONS Regulators which see heavy use, particularly those used in salt water, often require extra effort to remove dirt and corrosion from the parts of the regulator. Some suggested cleaning solutions are listed at the end of this section, and there are probably many others being used successfully. Here are a few general suggestions we can make: 1. Don’t expect your cleaning solution to do all the work in a matter of seconds.
mounting the regulator on the tank valve. Slide the hose protectors back to inspect the areas of the hose normally covered. Be sure all hose connections are tight. 2. Before turning on the tank air valve, check to make sure that the yoke nut or DIN connection is tight and the regulator body is aligned properly, with no kinks in the hoses. 3. Turn the tank valve on slowly and listen for leaks. If any leaks are found, replace or repair parts as recommended. 4.
7.0 TWO YEAR WARRANTY AND MAINTENANCE INFORMATION 7.1 PROPER PROCEDURE FOR WARRANTY PAPERWORK 1. For detailed information on the operation of the Sherwood Scuba Two Year Limited Warranty, please refer to Sherwood Scuba Technical Bulletin #112. You can also contact Sherwood Customer Service if you still have questions about the warranty. 2. In most situations, no paperwork will be necessary. The customer will bring his or her regulator in for one of its two annual servicings under the warranty.
SECOND STAGE REGULATORS - OASIS™ SRB5700, BLIZZARD™ SRB5900, MAGNUM® SRB5300, BRUT™ SRB5100 NOTE: Labels (Item 1 below) in white, purple, pink, green, blue and yellow are available. Call Sherwood for part numbers. ITEM # CATALOG # 1 . . . . . . . . . . . . .5100-7WH . . 1 . . . . . . . . . . . . .5300-7WH . . 1 . . . . . . . . . . . . .5700-7Y. . . . 1 . . . . . . . . . . . . .5700-7BK . . 1 . . . . . . . . . . . . .5900-7BL. . . 1 . . . . . . . . . . . . .5900-7BK . . 2 . . . . . . . . . . . . .5700-8 .
6204 Goodrich Road Clarence Ctr, New York 14032 www.sherwoodscuba.com © 2001 The Liberty Group Printed in the U.S.A on recycled paper Sherwood Scuba, the SS symbol, Oasis, Blizzard, Magnum, Brut and Wisdom are trademarks of Sherwood, Harsco Corporation Gas and Fluid Control Group. All other names are trademarks of their respective owners. ALL PRODUCTS SUBJECT TO CHANGE WITHOUT NOTICE.
