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Summary of Contents for Sherwood Scuba SR2
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Page 1: Second Stage
SR2 Service Manual - Second Stage -... - Page 2 Before attempting to perform service read this manual in its entirety. There are warnings and cautions contained in the manual that may affect your safety or the safety of the regulator user. If you are uncertain as to whether you are qualified to perform this service contact your regional Sherwood Scuba Distributor for technical assistance.
- Page 3 3000 psi. Again check intermediate pressure. It should not exceed 145 psi. The specified intermediate pressure for the SR2/SR1 is 135+/- 10 psi. If intermediate pressure is out of range or leakage is present a standard service overhaul is recommended.
- Page 4 Sherwood Scuba offers a standard service kit PN# 1000-PK that contains the parts required to be replaced in con- nection with the standard service overhaul for both 1st and 2nd stages and PN# 4000-PK for the SR2/SR1 octo.
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Page 5: General Comments
www.sherwoodscuba.com NOTE – Read this section completely before attempting to perform service. GENERAl COMMENTS 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. Refer to the Illustrated Parts List while performing service. -
Page 6: Facility Requirements
ENRICHED AIR NITROX SERvICE The SR2/SR1 have 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. -
Page 7: Recommended Tools
RECOMMENDED TOOlS The specialty tools identified below may be purchased from your Sherwood Scuba Distributor. Common tools are available from several sources. Common Tools Open End Wrenches - 9/16”, 5/8”,1/2” Box End Wrench – 3/4” Hex Keys 1/4”, 5/32”,1/8”... -
Page 8: Disassembly Procedure
www.sherwoodscuba.com DISASSEMBly pROCEDURE If the Second and First stages are still connected together, record the First Stage and Second Stage serial numbers and an inventory of all attached accessories before beginning disassembly. Perform an inspection of the regulator in accordance with the Annual Inspection Guidelines. This process will provide an assessment of the regulator condition before the service is performed This information may be valuable to understand any conditions that are not corrected by the standard service. - Page 9 www.sherwoodscuba.com If further disassembly of the Cover Assembly is determined to be necessary, use Cover Retainer Tool (PN# 20- 622-100) to engage the slots in the Cover Retainer (11) and rotate counterclockwise to separate the Cover Retainer from the Accent Ring (14). This will release the Purge Button (13) and the Cover Ring (12). Set aside for cleaning and reassembly.
- Page 10 www.sherwoodscuba.com 10. Remove the Retainer Nut (36) with a 3/4” box end wrench or 3/4” deep socket. If present remove the Clip using a small flat blade screw driver. Set parts aside for cleaning and reassembly. 11. While depressing the Lever (34) fully with one hand, push on the threaded end of the Valve Body (18) to remove the entire subassembly from the Housing (1).
- Page 11 www.sherwoodscuba.com 13. Remove the Adjustment Sleeve (17) from the Valve Body by rotating it counterclockwise. Remove O-ring (22). Set both parts aside for cleaning, inspection and reassembly. 14. Remove the Lever (34) by gently prying one leg at a time outward until it clears the Valve Body. 15.
- Page 12 www.sherwoodscuba.com 18. Rotate the control Knob (32) counterclockwise until the adjuster body subassembly (27) separates from the Valve Body (18). Set the assembly aside for later disassembly. The Poppet (35), Spring (23) and Balance Chamber (24) will release from the Valve Body. Remove and discard O-ring (26). Remove the Seat (20) by grasping and pulling lightly.
- Page 13 www.sherwoodscuba.com ClEANING & INSpECTION pROCEDURES ClEANING: 24. Thermoplastic, silicone rubber and anodized aluminum parts, such as diaphragms, accent trim, adjustment knobs, static 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.
- Page 14 www.sherwoodscuba.com 26. Hoses - a. Corrosion or mineral deposits on the metallic fittings on hoses may be cleaned using the procedure presented above provided that care is taken to just dip only the metal fittings at each the end of the hose into the cleaning solution.
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Page 15: Reassembly Procedures
www.sherwoodscuba.com REASSEMBly pROCEDURES 28. Place an amply lubricated new O-ring (9) on the Orifice (21) and insert the Orifice into the threaded end of the Valve Body (18). Press with the plastic end of a pick tool unit the Orifice is fully seated. NOTE –... - Page 16 www.sherwoodscuba.com 33. Thread the Adjustment Sleeve (17) onto the Lever Saddle (19) until there is only about one thread exposed. Set valve body assembly (9) aside. 34. Place a lubricated new O-ring (31) on the Stem (28) and insert the Stem into the Adjuster Body (27). Use a 1/8”...
- Page 17 www.sherwoodscuba.com 37. Insert the Adjuster Body (17) into the Valve Body (9) threading clockwise just until thread engagement starts. Place the control Knob (20) onto the Adjuster Body and continue threading the adjuster Body into the Valve Body until the groove in the Adjuster Body is centered in the rectangular hole in the Valve Body. Adjuster Body Groove Aligned with valve Body Hole 38.
- Page 18 www.sherwoodscuba.com 43. While holding the Housing (1) with the two tabs located on the shoulder of the housing below the mouthpiece boss facing up, locate the two slots on the top of the Exhaust Cover (3). Align the two slots with the two tabs and assemble the exhaust Cover to the Housing, complete the installation of Exhaust Cover by compressing the bottom edge of the cover engaging the two lower slots and tabs.
- Page 19 www.sherwoodscuba.com 45. Install the Diaphragm (6). 46. Install the Cover Assembly into the Housing and tighten by hand until the space between the Housing and Cover Assembly is closed. When the Cover is fully installed the “SHERWOOD” logo will be displayed in hor zontal alignment with front of the second stage.
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Page 20: Second Stage Adjustment
If there is not a strong flow, it is likely that the Lever was not positioned correctly repeat steps 19-21. 54. Install the Mouthpiece (5) onto the Housing. Secure the connection with a Tie Strap (10). Trim excess material from the Tie Strap. This concludes the service procedure for the SR2 Second Stage... - Page 21 1200-25 Cover Retainer 1200-6 Ring Seal 2200-23 Cover Ring SR2 970006 O-ring 2200-24 Purge Button, SR2 1200-20 Knob 2200-44 Purge Button, SR2 Octo 1200-21 Knob Retainer 2200-21 Accent Ring, SR2 1200-8 Lever 1200-2 Adjustment Sleeve 1200-11 Poppet 1200-9 Valve Body...
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