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4
GENERAL CONVENTIONS
Unless otherwise instructed, the following terminology and
techniques are assumed:
1.
When instructed to remove, unscrew, or loosen a thread-
ed part, turn the part counterclockwise.
2.
When instructed to install, screw in, or tighten a threaded
part, turn the part clockwise.
3.
When instructed to remove an o-ring, use the pinch
method (see figure) if possible, or use a brass or plastic
o-ring removal tool. Avoid using hardened steel picks, as
they may damage the o-ring sealing surface. All o-rings
that are removed are discarded and replaced with brand
new o-rings.
4.
The following acronyms are used throughout the manual:
MP is Medium Pressure; HP is High Pressure; IP is Inter-
mediate Pressure.
Pinch Method
Press upwards on sides of o-
ring to create protrusion. Grab
o-ring or insert o-ring tool at
protrusion to remove.
5.
Numbers in parentheses reference the key numbers on
the exploded parts schematics. For example, in the state-
ment, "...remove the o-ring (20) from the...", the number
20 is the key number to the crown o-ring.
DISASSEMBLY PROCEDURES
F
Note:
Before performing any disassembly, refer to
the exploded parts drawing, which references all
mandatory replacement parts. These parts should
be replaced with new, and must not be reused
under any circumstances - regardless of the age
of the regulator or how much use it has received
since it was last serviced.
CAUTION:
Use only a plastic or brass o-ring
removal tool (PN 944022) when removing o-
rings to prevent damage to the sealing surface.
Even a small scratch across an o-ring seal-
ing surface could result in leakage. Once an
o-ring sealing surface has been damaged, the
part must be replaced with new. DO NOT use a
dental pick, or any other steel instrument.
Legend LX Second Stage Service Manual
1.
Using two ¹¹₁₆" wrenches, hold the retaining nut (15)
stationary while turn the hose swivel counterclockwise.
Remove the o-ring (38) from inside the hose swivel. Exer-
cise caution not to scratch the o-ring groove. Remove the
o-ring (42) from the male end of the hose.
2.
Pull back the two hose
protectors (39 & 41) and
inspect the hose crimps.
The crimps should be free
from damage and the hose
should not be pulling out of
the crimp. If it is, the hose
must be replaced.
3.
Using your hand, unscrew the retaining ring (1). Separate
the retaining ring from the rubber mating ring (2). Lift out
the purge cover (4).
F
NOTE:
Normally, there is no need to remove the
nameplate (3).
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