Service & Repair Manual - Impulse Second Stage
Doc. #1078-56
Introduction
This manual provides factory prescribed proce-
dures for the correct service and repair of the Im-
pulse second stage. It is not intended to be used as
an instructional manual for untrained personnel. The
procedures outlined within this manual are to be
performed only by personnel who have received
factory authorized training through a U.S. Divers
®
/
Aqua-Lung
®
Service & Repair Seminar.
If you do not completely understand all of the
procedures outlined in this manual, contact U.S.
Divers Co., Inc. to speak directly with a Technical
Advisor before proceeding any further.
Warnings, Cautions, & Notes
Pay special attention to information provided in
warnings, cautions, and notes that are accompanied
by one of these symbols:
A
WARNING
indicates a procedure or situation
that may result in serious injury or death if
instructions are not followed correctly.
A
CAUTION
indicates any situation or tech-
nique that will result in potential damage to the
product, or render the product unsafe if in-
structions are not followed correctly.
A
NOTE
is used to emphasize important
points, tips, and reminders.
Scheduled Service
Because the Impulse regulator, complete with a
first stage, is considered to be a life-supporting
product, it is extremely critical that it receives ser-
vice according to the procedures outlined in this
manual on a regularly scheduled basis; at least once
a year with normal or infrequent use.
NOTE
: A unit that receives heavy or frequent
use, such as in rental, instruction, or commer-
cial applications, should be serviced at least
twice each year - or more often - depending on
the conditions of use and the manner in which
it is maintained. (Refer to the care and mainte-
nance procedures outlined in the Impulse
Owner’s Manual.)
GENERAL GUIDELINES
1.
In order to correctly perform the procedures
outlined in this manual, it is important to follow
each step exactly in the order given. Read over
the entire manual to become familiar with all
procedures before attempting to disassemble the
Impulse, and to learn which specialty tools and
replacement parts will be required. Keep the
manual open beside you for reference while
performing each procedure. Do not rely on
memory.
2.
All service and repair should be carried out in a
work area specifically set up and equipped for
the task. Adequate lighting, cleanliness, and
easy access to all required tools are essential for
an efficient repair facility.
3.
Before beginning any disassembly, it is impor-
tant to first perform the Initial Inspection proce-
dure, and refer to Table 1 - Troubleshooting to
determine the possible cause of any symptoms
which may be present.
4.
As each regulator is disassembled, reusable
components should be segregated and not
allowed to intermix with non-reusable parts or
parts from other regulators. Delicate parts,
including inlet fittings and crowns which contain
critical sealing surfaces, must be protected and
isolated from other parts to prevent damage
during the cleaning procedure.
5.
Use only genuine factory parts purchased di-
rectly from U.S. Divers (or an authorized dis-
tributor outside of the U.S.) when servicing any
U.S. Divers/ Aqua-Lung product. Substitution
with another manufacturer’s parts constitutes an
after-market modification of the product, and
renders all warranties null and void.
6.
Do not attempt to reuse mandatory replacement
parts under any circumstances, regardless of the
amount of use the product has received since it
was manufactured or last serviced.
7.
Do not overtighten parts beyond their torque
specification when reassembling. Most parts are
made of either marine brass or plastic, and can
be permanently damaged by undue stress.
