Cressi-sub MC5 Manual

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 1 1
Regulators repair and maintenance
Regulators repair and maintenance 1st stage MC5
1st stage MC5
MC5 INT HZ 800098
MC5 INT HZ 800098
MC5 DIN 300 bar HZ 800099
MC5 DIN 300 bar HZ 800099

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 2 2
Regulators repair and maintenance
Regulators repair and maintenance 1st stage MC5
1st stage MC5
• This document is intended for experienced technical personnel who
have already attended a Cressi-sub training course on equipment
repair and maintenance.
• We decline any responsibility for any maintenance and/or repair
operation carried out by unauthorized personnel.
• Avoid carrying out maintenance and repair operations on the
equipment without the correct training required.
• Should the information reported in this manual be unclear or not fully
understandable, please contact Cressi-sub before carrying out any
disassembling or maintenance operation.
• Before carrying out any operation, Cressi-sub recommend to read
this manual carefully in order to get to know thoroughly all necessary
tools and techniques to carry out a correct maintenance and repair of
the equipment.
WARNING !
WARNING !

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 3 3
Regulators repair and maintenance
Regulators repair and maintenance 1st stage MC5
1st stage MC5
• Before any operation, Cressi-sub recommend to read carefully the
present document in order to get to know thoroughly all
necessary tools and techniques to carry out a correct maintenance
and repair of the equipment.
• Use this document during every phase of the equipment
maintenance and repair, in order not to leave out any sequence.
• On the contrary, bad working or even accidents might occur.
• Pay particular attention to the advices written on the sides of the
pictures representing the different phases of maintenance and
repair, in order to avoid any possible problem that might cause
accidents.
• All operations described in this manual are relating and destined
only to disassembling, maintenance and assembly of equipments
to be used with air (21% oxygen, 79% nitrogen).
WARNING !
WARNING !

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 4 4
Regulators repair and maintenance
Regulators repair and maintenance
1st stage MC5
1st stage MC5: :
exploded
exploded diagram diagram
MC5 INT 1st STAGE (HZ 80068)
ANNUAL REPLACEMENT KIT CHART
(Real Size)
MC5 DIN 1st STAGE (HZ 80053)
ANNUAL REPLACEMENT KIT CHART
(Real Size)

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 5 5
Regulators repair and maintenance
Regulators repair and maintenance 1
1st
st stage MC5 INT
stage MC5 INT
•
•Kit MC5 Kit MC5 Int Int Yearly Yearly maintenance maintenance
•
•Cod. Cod. N N° °HZ 800068 HZ 800068
(Real Size)
•
•Use only Use only Cressi Cressi- -sub original replacement units sub original replacement units
•
•Note: Note: we we recommend recommend to to carry carry out a complete out a complete maintenance maintenance of of your your regulator regulator
once a
once a year year or more in case of a or more in case of a particularly particularly intensive intensive use use. .
Go back to

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 6 6
Regulators repair and maintenance
Regulators repair and maintenance 1
1st
st stage MC5 DIN
stage MC5 DIN
•
•Kit MC5 Kit MC5 Int Int Yearly Yearly maintenance maintenance
300 bar
300 bar - -Cod. Cod. N N° °HZ 800053 HZ 800053
(Real Size)
Go back to
•
•Use only Use only Cressi Cressi- -sub original replacement units sub original replacement units
•
•Note: Note: we we recommend recommend to to carry carry out a complete out a complete maintenance maintenance of of your your regulator regulator
once a
once a year year or more in case of a or more in case of a particularly particularly intensive intensive use use. .

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 7 7
Regulators repair and maintenance
Regulators repair and maintenance 1
1st
st stage MC5
stage MC5
• Cressi-sub recommends a full maintenance of the regulator at least
once a year or more in case of particularly intensive use. The
maintenance must include the replacement of every OR, of the
conical filter and relating clip, of the first stadium HP pad and of the
seal.
• The required tools to carry out the maintenance are described in a
section of this manual.
• Wash the metal parts in warm water and soap, then rinse them in
fresh water. Remove any concretion by means of ultra-sound
cleaning or diluted acid solutions and rinse them carefully in fresh
water.
•
•Yearly Yearly maintenance maintenance

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 8 8
Regulators repair and maintenance
Regulators repair and maintenance 1
1st
st stage MC5
stage MC5
• Grease all new OR with a thin silicone film: this will reduce to the
minimum the risk of damage during the assembly phases.
• You may grease the first two turns of the metal threads.
• All operations described in this manual are relating and destined
only to disassembling, maintenance and assembly of equipments to
be used with air (21% oxygen, 79% nitrogen).
•
•Yearly Yearly maintenance maintenance
•
•Use only original Use only original Cressi Cressi- -sub spare parts sub spare parts

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 9 9
Regulators repair and maintenance
Regulators repair and maintenance
1
1st
st stage MC5:
stage MC5:
disassembling phases
disassembling phases
• Use the special spanner to
disassemble the bracket
blocking nut, as shown in
the picture, after screwing
the special threaded tool in
one of the first stage ports
and tightening the
regulator in a vice.

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 10 10
Regulators repair and maintenance
Regulators repair and maintenance
1
1st
st stage MC5:
stage MC5:
disassembling phases
disassembling phases
• Should you not
have the special
spanner to
remove the
bracket, you can
use a big roll
spanner to
unscrew the
blocking nut, as
shown in the
picture.

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 11 11
Regulators repair and maintenance
Regulators repair and maintenance
1
1st
st stage MC5:
stage MC5:
disassembling phases
disassembling phases
• Remove the 1st stage bracket blocking nut and the bracket.
2 = HZ 770080 4 = HZ 800089

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 12 12
Regulators repair and maintenance
Regulators repair and maintenance
1
1st
st stage MC5:
stage MC5:
disassembling phases
disassembling phases
• Remove the sintered filter and take out the 1st stage whole valve.
10K = HZ 800058
6 = HZ 800056

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 13 13
Regulators repair and maintenance
Regulators repair and maintenance
1
1st
st stage MC5:
stage MC5:
disassembling phases
disassembling phases
• Remove the bracket blocking nut OR washer, then take the whole
HP racket-piston bush out of its seat.
11 = HZ 800059
5 = OR HZ 800055
4 = HZ 800054

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 14 14
Regulators repair and maintenance
Regulators repair and maintenance
1
1st
st stage MC5:
stage MC5:
disassembling phases
disassembling phases
• Should the regulator
have been used
intensively and show
oxidization spots, we
recommend to hit
slightly all around the
perimeter of the 1st
stage disk with a
hammer of synthetic
material.

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 15 15
Regulators repair and maintenance
Regulators repair and maintenance
1
1st
st stage MC5:
stage MC5:
disassembling phases
disassembling phases
• Keeping the 1st
stage tightened on
the vice by means
of the threaded
tool, remove the
disk using a 11,8
in. hexagonal
spanner.
22 = HZ 800063

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 16 16
Regulators repair and maintenance
Regulators repair and maintenance
1
1st
st stage MC5:
stage MC5:
disassembling phases
disassembling phases
• Remove the diaphragm, inserting a blunt tool inside the 1st stage
and pushing, as shown in the picture.
• You can also remove the diaphragm out of its seat, by letting in
low pressurized water through a 3/8“LP port.

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 17 17
Regulators repair and maintenance
Regulators repair and maintenance 1
1st
st stage MC5 INT
stage MC5 INT
1st stage body
Setting screw
Spring smoother
Setting spring
Spring-guide flat
Diaphragm blocking disk
Diaphragm
Pin pushing tool – pin
HZ 800065
HZ 800064
HZ 800080
HZ 800063
HZ 800062
HZ 800082
HZ 800062 / HZ 800061
16K = HZ 800060
HP piston jacket
HZ 800059
Complete HP valve
10K = HZ 800058
HP piston HZ 800085
Filter
HZ 800056
Bracket blocking nut
HZ 800054

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 18 18
Regulators repair and maintenance
Regulators repair and maintenance 1
1st
st stage MC5 DIN
stage MC5 DIN
Setting spring
Piattello guida molla
HZ 800081
HZ 800081
HZ 800080
HZ 800080 1st stage body
Setting screw
Spring smoother
Diaphragm blocking disk Diaphragm
Pin pushing tool – pin
HZ 800065
HZ 800064
HZ 800063 HZ 800082
HZ 800062 / HZ 800061
16K = HZ 800060
HP piston jacket
HZ 800059
Complete HP valve
10K = HZ 800058
HP piston
HZ 800085
Filter
HZ 800056
DIN filter body
26K = HZ 800067
DIN wheel
DIN 300 connection

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 19 19
Regulators repair and maintenance
Regulators repair and maintenance
1
1st
st stage MC5: assembling
stage MC5: assembling
phases INT
phases INT- -DIN DIN
• Use a tool
to insert the
anti-
extrusion
ring in the
balancing
chamber.
7K = HZ 800057

January
January 2008 2008 Rev. MC5 / 1 Rev. MC5 / 1 Ed. A / 08 Ed. A / 08 20 20
Regulators repair and maintenance
Regulators repair and maintenance
1
1st
st stage MC5: assembling
stage MC5: assembling
phases INT
phases INT- -DIN DIN
•InserttheORin
the balancing
chamber, after
greasing it
properly.
• Note: it is very
important to
grease the HP
valve well, to
make it work
correctly.
7K = HZ 800057