Sherwood SRB3108 User Manual

Assembly & Maintenance Guide

REGULATORS

(SRB3209)

™

MINIMUS

(SRB3108)

SHADOW

TABLE OF CONTENTS

Page

Topic Number

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Tools Required for Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Parts Cleaning Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Maintenance & Handling Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

IMPORTANT

Read all instructions and procedures in this manual carefully before servicing the regulator. Parts have changed cosmetically over the years, but newer style parts can usually be used in place of older parts. The most current part numbers can be obtained by calling your authorized Sherwood Distributor. If you have any questions, contact your Sherwood Sales Representative or authorized Sherwood Distributor.

INTRODUCTION

This manual is a guide for the annual servicing and maintenance of the Sherwood SR3108 Minimus and SR3209 Shadow+ regulators. It 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.

Because of the many unique features found only 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.

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.

For information on the dates and locations of upcoming Sherwood service seminars near you, contact your Sherwood Distributor or Sherwood Sales Representative.

IMPORTANT

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 also 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.

SPECIFICATIONS

REGULATOR MODEL . . . . . . . . . . . . . . . .Sherwood SR3108 Minimus & SR3209 Shadow+

AIR FLOW . . . . . . . . . . . . . . . . . . . . . . . . .29 cu. ft. / min. @ 1 atmosphere

INHALATION RESISTANCE . . . . . . . . . . .1.5" w.c @ 1 atmosphere

EXHALATION RESISTANCE . . . . . . . . . . .0.8" w.c. max. @ 1 atm.

RECOMMENDED LUBRICANTS . . . . . . . .LTI Christo-Lube #1110, Dow Corning 111 Compound

, Parker

Super O-Lube®, or equivalent

TYPE . . . . . . . . . . . . . . . . . . . . . . . . . . . .Downstream valve, diaphragm, with Variable Fulcrum

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

WEIGHT . . . . . . . . . . . . . . . . . . . . . . . . . .4.2 oz. (octopus w/o main hose

8.1 oz. (Shadow+ w/o main hose)

HOSE LENGTH . . . . . . . . . . . . . . . . . . . . .36 in.

MATERIALS . . . . . . . . . . . . . . . . . . . . . . .Cover - Thermoplastic Triax

Case - Thermoplastic Triax

Poppet Seat - Liquid Silicone Tm Rubber

0-rings - Buna-N

Diaphragm - Tufel®(Blue) Exhaust Valve - Thermoplastic Elastomer Mouthpiece - C-Flex

TOOLS REQUIRED FOR MINIMUS & SHADOW+ SERVICING

— # 10 Torx Screwdriver (Sherwood Tool TL117) — Phillips screwdriver — 3/4" wrench — 5/8" wrench — 9/16" wrench — 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 (TL123) — Sherwood Stem Socket Tool (p/n TL124)

DISASSEMBLY

To view the complete parts list of the second stage, fold out the front cover of this manual.

(1) Pull back the hose protector (Item 21) from the inlet end ferrule. Remove the hose assembly (Item 20) from the orifice housing (Item 16) using a 3/4" and a 5/8" wrench. Inspect the hose assembly for any cuts or cracks, especially on the hose at the metal ferrules. Replace the hose assembly if any cuts or cracks are found.

(2) Remove the mouthpiece (Item 15) by cutting the mouthpiece tie (Item 14) with side cutting pliers. Discard the old mouthpiece tie. Examine the condition of the mouthpiece. Pay particular attention to the area on top just behind where the old tie tightened. This is a prime area for small holes to develop. If the mouthpiece is in good condition, it can be reused.

(3) Pry out the exhaust grid (Item 10) with a small screwdriver.

(4) Use a #10 Torx (or small slot) screwdriver to remove the four screws (Item 12) holding the front cover (Item 1) in place.

(5) Gently remove the diaphragm (Item 2) from the cover. Hold the diaphragm up to a light source.

Gently

stretch the diaphragm and look for tears or pinholes. If any are found, replace the diaphragm. Otherwise, the diaphragm can be reused.

Note: If the unit is a SR3209 Shadow+, at this point you should pull off the swivel (Item 26, Fig. 1) from the orifice housing (Item 23). Inspect the inner bore of the swivel for any scratches that may have caused air leakage. Remove and inspect the O-rings (Items 24 & 25) from the orifice housing. Replace them if any wear or deformation of the O-rings is found. Remove the short hose assembly (Item 27) from the swivel using a 9/16" wrench. Inspect the hose for kinks and bulges.

(6) Hold the case in one hand and use a 3/4" wrench to loosen and remove the orifice housing from the lever assembly. The case is strengthened at the lever support area to withstand the turning forces of the lever support when this is done.

(7) Use the Sherwood in-line adjusting tool (p/n TL102) to, back the adjusting orifice (Item 18) 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).

(8) Remove the O-ring (Item 19) from the adjustable orifice.

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