Uwatec A700 User manual

A700 Step-
by-step
maintenance
procedures.
Refer to schematic for
part identification.
Rene' Dupre' - Technical Training
Manager – 8/2009 Copyright,
Modified 7/2010
Important note: The following information is not designed to be a complete training guide for servicing the listed SCUBAPRO
regulators. All SCUBAPRO technicians are required to attend an annual service training program to insure safe handling and
servicing of SCUBAPRO products. All SCUBAPRO technicians must be employed by an authorized SCUBAPRO facility.

A700 Step-by-step maintenance procedures.
2
To properly service the A700 second stage, the following or suitable alternatives are required.
SCUBAPRO universal tool P/N 43.040.000. Purchase direct from SCUBAPRO.
Pneumatic adjusting tool. Recommend source: www.scubatools.com
TORX® 10 Driver. Recommended source: Your favorite hardware store.
TORX® 10 Plus Torque. Recommended source: www.wihatools.com
Brass o-ring pick set. Recommended source: www.scubatools.com
Flat blade screw driver.
“Fixed” nut.
Do not
remove/service. Disassembly begins on following page
Included in kit
STOP! Do not remove the
finishing-nut, item 38. Item
38 is factory fixed to the case,
(item 7), as a sub assembly.
Caution: Items 16, 20 & 39
need not be removed during
routine annual services. Dully
inspect these components for
damage, leaving them in place.
Replace as needed.
Item 10 are now one piece and black in color

A700 Step-by-step maintenance procedures.
3
1. Pull second stage
hose sleeve back – to
expose LP hose swivel,
loosen the swivel using
the SCUBAPRO universal
tool.
6. Hold the diaphragm to
light and stretch it from 4
points to check for
punctures. Reposition
and repeat to be sure
there are no punctures
and that the diaphragm is
imperfection free.
7. Inspect the smooth
operating side of the disc
for signs of wear. Replace
as necessary.
2. Using a TORX® T10
driver, remove the 4
front cover screws.
Remove the cover.
8. Next, remove the “dive
switch” assembly. First
remove the safety “C”
clip by placing a flat
blade screw driver in the
negative detent (or the
bottom side of the wave)
of the “C”-clip.
3. The screws are
conveniently held in
place with o-rings – to
avoid losing them.
Remove the o-rings, as
new ones are supplied in
the annual service kit.
9. Then slide your finger
or thumb to provide
support and pry, via light
leverage.
4. Separate the purge
cover and ring. Inspect
the integrity of the
purge and ring.
The metal, stainless
steel “S” insignia is not
removable.
10. Pull the complete
“dive switch” assembly
free from the 2nd. stage
case and remove the 2 o-
rings, using a brass pick.
5. Carefully remove the
inhalation diaphragm.
Replace if it smells of
diesel or gas, is tacky or
distorted.
Do not remove the finishing-nut (jam nut ) – to
avoid permanent damage. The inlet tube is silver
soldered to the case, and then pressure tested for
leaks. Nothing is gained by removing the nut; it is for
cosmetic purposes only and held using factory applied
soft thread locking agent. Submerging the A700 case
into an ultrasonic unit, using SCUBA industry-marketed
ultrasonic cleaning solutions is recommended to safely
clean case.
Dive switch
Min / Max
C-clip

A700 Step-by-step maintenance procedures.
4
11. Lift the decal from
the adjustment knob,
using a suitable
device. A new decal is
supplied in the A700
maintenance kit.
16. Remove both the
shaft o-ring and
sleeve o-ring, using a
brass pick.
17. The technician
micro-adjust is
concealed within the
knob stem and is
driven out clockwise,
using a small flat
blade screwdriver.
12. Unscrew the 4
mm adjustment knob
Allen-screw and
remove the o-ring.
Tech tip: Temporarily
screw the “micro-adjust”
(adj. screw) into
the”adjustment-shaft”.
This will give you more
area to grab and assist
with the removal of the
126 o-ring.
Remove its o-ring,
with a brass pick.
13. Pull the knob free
from the adjustment
shaft.
19. Push the poppet
assembly free, using
a blunt small
diameter tool, like a
3/32 ball-end Allen
driver.
14. Push on the
adjustment shaft end
to separate it from
the “dive switch”.
20. Driver of choice
must be slim enough
to pass through the
center of the
adjustable orifice.
15. Screw the
adjustment shaft
clockwise, to separate
it from the metal
sleeve.
In some cases, you
may find it helpful to
use the adjustment
knob.
21. Remove balance
chamber and spring.
Micro adj.
Adj. shaft

A700 Step-by-step maintenance procedures.
5
22. Expel o-rings
out of the
grooves (slightly)
with one set of
figures and shove
off with other.
Avoid use of
tools, they may
cause damage.
“Flow deflector”
(aspirator) need not be
removed!
If you must – it is a snap
fit. Flow deflector is
orientation specific!
23. Usage of
small profile brass
o-ring picks is
also handy – just
be careful not to
score the o-ring
lands.
26. Look inside the inlet
tube, with proper
lighting – to be sure
both lever tabs (deep
inside the inlet tube) are
present and imperfection
free.
24. Pinch and
separate the low
pressure seat.
Note: The LP seat
is a press fit.
Press in / pull
out.
27. Fully engage function
#7 into the back slots of
the adjustable orifice.
Unscrew
counterclockwise,
until threads have
disengaged, (approx. 4
rotations).
28. Expel the adjustable
orifice with care, by
pushing slowly from the
“knob” side of the inlet
tube. Your tool of choice
must clear the lever tabs
and orifice knife-edge.
29. Remove o-ring, with
soft brass pick.
30. Now thoroughly
inspect the knife-edge
surface using your
finger-nail to detect any
nicks or imperfections,
by rotating the orifice
back and forth.
Lever – need not be removed! Visually
inspect the lever to be sure an
inexperienced technician hasn‟t bent it
previously. The lever should “parallel” the
inlet tube from end-to-end.
25. Using a
magnifying glass –
inspect the poppet
“shoulders”,
marked in red -
for any signs of
wear, due to
cam action .
Though rare,
replace as needed.
1 - Expel
2
S
h
o
v
e
1
2

A700 Step-by-step maintenance procedures.
6
31. Remove inlet tube
o-ring.
32. Grasp, twist and
pull the exhaust T
free.
The slight twist helps
removal and/or break
up of unseen
encrusted salt.
36. Pull the
mouthpiece free and
inspect.
Note the position of
the index figure and
thumb inside the ends
of the exhaust T.
37. Grasp, twist and
pull the “mouthpiece
support” free.
Exhaust valve need
not be removed.
Inspect the exhaust
valve for any signs of
damage or
imperfections.
Note: Inspect for
insect/rodent damage.
33. Look from the side
to be sure the exhaust
valve is laying flat and
maintaining a good
seal to the case.
34. Remove the
mouth piece by
“releasing” the
specialized clamp
locking device.
See next image for
more detail…
35. To release the clamp lock,
position your tool of choice on
one of the outside “guides”
of clamp locking mechanism –
rather than the “hook‟ itself.
Cleaning suggestions
continued on next page…
Serial Number

A700 Step-by-step maintenance procedures.
7
We are now ready to clean the separate components, using an ultrasonic cleaner
and suitable solutions, specifically marketed by SCUBA industry suppliers.
One source for such items is: Global Manufacturing Company.
Following is an excerpt from their web site.
“Perhaps the most effective way to clean small parts
including those from scuba regulators / valves is by
ultrasonic‟s. This requires a special machine which generates
high-frequency vibrations (beyond the
range of human hearing) within certain liquid
solvents. Forceful bubble impulsions bombard
virtually every surface of any material submerged
in the liquid; this cavitation literally blasts the contaminants
off the parts, producing a state of microscopic cleanliness!
http://www.gmcscuba.com
Isolate any delicate parts (like the orifice) to protect them from damage during the cleaning cycle.
Detail the adjustable orifice using a
common pencil eraser.
An ample rinsing station with
running water is ideal.
Do not use solutions like: Vinegar, assorted
pool acids, toilet bowl cleaners nor the like. They
will cause irreversible damage to the chrome finish
of the A700.

A700 Step-by-step maintenance procedures.
8
6. With the adjustable
orifice slots at the 12 and
6 o‟clock position – install
the 132 o-ring using both
thumbs.
1. Push the “mouthpiece
support” (trim collar) onto
the case tube, and then fit
the mouthpiece.
Orient SCUBAPRO® on
top.
7. Apply a dot of quality
lubricant to the beginning
threads. This will ensure
easier removal during the
next service. Simply
push orifice into inlet
tube. No adjustment
yet!
2. Spread and fasten the
specialized hook and lock
clasp. (Cam action).
Note: Position the clasp
opposite the “dive
switch”, avoiding
interference.
8. Refresh the poppet
with the new o-rings and
LP seat supplied in the
maintenance kit.
Push lubricated o-rings
into the grooves.
9. Pull the second o-ring
onto the stem and use
your nail to pull passed
the first and into the
(inside) groove.
Apply a “bead” of
quality lubricant
between the o-rings.
10. Utilizing a clean hard-
flat surface – firmly press
the poppet onto the LP
seat, uniformly.
Note: It may be helpful to
heat the exhaust T,
warming a bowl of hot
water in the micro wave
or using a hair dryer.
Note: Wipe the surface of
the newly installed LP
seat, to remove
manufacturing residues.
Reassembly…
Install the exhaust T.
3. With thumbs inside the
larger T outlets, position
and angle the exhaust T
into the section between
the mouthpiece-tube
and ex. valve retainer-
ring. Feel for the
exhaust valve retainer-
ring.
4. Grasp the case from the
other side with fingers.
5. Press together and “roll”
your thumbs forward
“feeding” the remainder
of the T onto the ring.

A700 Step-by-step maintenance procedures.
9
11-A. Seal the LP seat
hole with thumb.
11-B. Place the balance
chamber onto the stem
just enough to cover the
o-rings.
Refresh these
components with new o-
rings.
Following are some
suggestions – to facilitate
assembly.
12. Now squeeze the
components together –
creating an air spring.
Note: The chamber
should “spring” up and
down, as you push and
release.
Tech tip: “micro-adj.”
Temporarily screw the
“micro-adjust” (adj.
screw) into the
”adjustment-shaft”. This
will give you more control
to install the 126 o-ring.
Note: If the components
go flat, submerge U/W to
detect leak - revealed by
bubbles.
Tech tip continued…
14. Push and spread the
126 o-ring onto the end
with the “nipple”.
13. Pre assemble the
poppet, spring and
balance chamber. Orient
the pair of “poppet
shoulders” (down) in
relation to the lever (up)
and insert into the case
inlet tube.
Once the 126 o-ring is in
place, unscrew the
“micro-adjust” and
proceed.
Continued…
The objective is to engage
the poppet assembly with
the lever-tabs. Apply
pressure with your index
finger and the lever
should rise.
15. Following is dynamic
application , lubricate the
o-ring groove and slide
the 293 o-ring down the
“adjustment shaft, into
the first/true o-ring
groove. Then lubricate
the male threads.
Continued…
Maintain the “spring-load”
and push the lever down.
If correct the lever will
return (under spring
load). Cycle several
times.
16. Spread the 351 o-ring
onto the metal sleeve.
Continued on next page…
Test for air-tight integrity by capturing air.
Seal

A700 Step-by-step maintenance procedures.
10
17. Push “micro adjust”
into the “adjustment
shaft” and hold with
finger-pressure.
22. Prep the „dive switch”
by installing both o-rings
supplied in the
maintenance kit.
Note the shortcut!
18. Using a flat blade
screw driver, inserted
through the shaft, turn
the micro adjust
counterclockwise until the
micro adjust bottoms out.
Continued…
Lubricate and spread the
new 160 o-ring into place.
19. Preset micro-adjust as
pictured below. That is,
bottom out
counterclockwise, and
then advance clockwise
exactly 2 full rotations –
leaving a 1 mm step
Continued…
Repeat and slide the
second o-ring into the
next groove.
See cut-a-way…
23. Push the adjustment
shaft sub-assembly into
the “dive switch”.
20. Screw the adjustment
shaft into the metal
sleeve.
24. Push until it bottoms
out.
21. It is helpful to
temporarily use the
adjustment knob to finish
– screw until the shaft
bottoms out.
Note: Orient the metal
sleeve tabs “north &
south” in relation to the 2
(long/short) dive switch
guides. The metal sleeve
tabs engage into the case
inlet-tube guides.
1 mm step