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.

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.

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.

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.

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

A700 Step-by-step maintenance procedures.

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.

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.

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.

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.

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

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