Sherwood SRB3600 manual Parts Cleaning Recommendations

b. Diaphragm improperly installed.	Visually check position of diaphragm.
c. Hole in the mouthpiece at tie area.	Replace the mouthpiece.
d. Hole in the diaphragm.	Replace the diaphragm.
e. Damaged exhaust valve, or edges of the	Replace exhaust valve.
exhaust valve not firmly seated on the case.
f. Crack in case.	Replace case.
HUMMING OR BUZZING DURING INHALATION:

a. Harmonic resonance between the springs and the mass of the piston.

NO AIR COMING FROM DRY AIR BLEED VALVE ON FIRST STAGE:

Refer to Section 5.2 in this manual. Disassemble the first stage and flip the main spring over. Change the position

of the piston in its bore. If resonance is still present, install a new piston and spring.

a. Piston flow element is plugged with grease	Replace piston.
b. Body-to-module O-ring 18 in wrong groove	Move O-ring from groove between flange and
body, to groove between flange and threads.

7.2PARTS CLEANING RECOMMENDATIONS

Regulators which see heavy use, particularly those used in salt water, often need 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:

1Don't expect your cleaning solution to do all the work in a matter of seconds. If the solution cleans extremely rapidly, it is probably too strong and is etching the finish on the parts. Use a wooden or plastic stick or a soft bristle brush to help get rid of the thickest deposits. Take special care not to damage orifice sealing areas. Dress the orifice sealing areas with a fine-grit polishing stick or pencil eraser after drying the parts.

2.Immerse only those parts which really need cleaning. With Sherwood's Dry Air Bleed system, the interior of the first stage is always clean and dry, so the piston and spring should never need cleaning. Immersing the clean Sherwood piston in contaminated cleaning solution can plug the flow control element in the face of the piston, which could slow or stop the flow through the positive air purge system.

3.Many of the solutions used for cleaning metal parts can damage the nitrile compounds found in O-rings. For this reason, remove all O-rings before placing parts in a cleaning bath.

4.If the first stage moving orifice (p/n29-3106-13A) is corroded because salt water has entered through the inlet filter, first make an attempt to clean it with a clean lint-free cloth or a soft brush in a fresh soapy water solution. If you must use a cleaning solution in an ultrasonic

21