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GENERAL COMMENTS
NOTE – Read this section before attempting to perform service.
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.
O-rings are classified by the service they perform and are identified as either static or dynamic. Dynamic
7.
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.
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General
Ample
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