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Document XLDS Guide – Section Four A
Revised September 30, 2019
40
SECTION FOUR A: RDC REPAIR / MAINTENANCE / OVERHAUL
11. Install the rubber environmental sleeve.
12. Ensure the cylinder has been properly
cleaned, inspected and is within hydro date,
then reinstall on the ICS bottle adapter, and
tighten snuggly by hand.
13. Reinstall the mount plate and fasteners onto
the ICS body, and mount securely to the
harness.
ICS Testing
Tools and Equipment Needed
•
Intermediate Pressure Gauge 0-300 psig
•
Shims 4XL62-22 (2)
•
Silicon Grease
•
8” Adjustable Wrench
•
1” Crows Foot Wrench
•
Torque Wrench 0-250 inch lbs.
•
¼” Nut Driver
Preliminary
After the entire ICS has been assembled, the ICS
needs to be tested for proper intermediate
pressure, and to ensure there are no leaks. Then
attach the ICS attached to the RDC console, in the
normal configuration, so that it can be checked
with the normal supply pressure of 350 psig. For
the intermediate pressure check, the ICS will
need to be attached to a helmet or mask or to
FFM. For the flow test, the flow meter will be in
place of the helmet, of full face mask.
1. Line up the RDC console with umbilical to one
of the divers circuits, ensuring that the HP air
supply is at least 1000 psig.
2. Attach the umbilical to the ICS inlet, then
attach the intermediate pressure gauge to the
helmet outlet whip, and snug by wrench.
3. Load the RDC regulator to 350 psig, and
bring up pressure to the ICS.
4. The pressure on the ICS pressure gauge
should read between 155-170 psig. Open and
close the EGS valve a couple times, to check
for a stable lock up pressure.
5. Secure air at the RDC outlet, then bleed down
the umbilical to zero, through the ICS/EGS
valve then secure the EGS valve and bring
pressure back up, and check the intermediate
lock up again. This cycling test helps set the
seat, and distributes the silicone grease
around the spring cavity.
6. If the ICS is intermediate pressure is above
170 psig, remove one shim (9), from under
the piston. If the pressure is below 155 psig,
add one shim (9), between the piston and
spring.
Figure 73
NOTICE
It is normal for the grease to squirt out, after cycling
a newly overhauled ICS regulator. Wipe off excess
grease.
NOTICE
A maximum of three shims may be used only. If
three shims do not restore the proper pressure
range the spring (8), should be replaced. For adding
or removing shims, refer to the disassembly and
reassembly section, of the ICS regulator overhaul.
