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Cressi-sub MC9 Repair And Maintenance Instructions Download Page 25

Regulators repair and maintenance 

25 

MC9 1

st

 stage: 

disassembling phases 

• In case the regulator 

has been used under 

water for a long time 

and shows oxidation 

traces, it may be 

useful to tap gently 

with a plastic 

hammer all along the 

perimeter of the first 

stage closing disk.  

January 2009 

Rev. MC9/B                                                         Ed.C/13 

Summary of Contents for MC9

Page 1: ...Regulators repair and maintenance 1 MC9 1st stage MC9 INT HZ 820097 MC9 DIN 300 bar HZ 820098 January 2009 Rev MC9 B Ed C 13 ...

Page 2: ...roper training required to conduct these operations Users must never perform maintenance themselves all maintenance must be performed EXCLUSIVELY by an authorized Cressi Sub center If the information provided in this document is unclear or not fully intelligible please contact Cressi sub before proceeding with any disassembly or maintenance procedures Before proceeding Cressi sub recommends that y...

Page 3: ...attention to the recommendations provided in the margin of the figures that show the various sequences of equipment maintenance and or repair in order to avoid any problems that could result in an accident The document below in no way replaces the equipment s instruction manual The procedures described in this document are pertinent to and intended only for the disassembly maintenance and assembly...

Page 4: ...Regulators repair and maintenance 4 MC9 1st stage spare parts January 2009 Rev MC9 B Ed C 13 MC9 MC9 S C MC5 1st STAGES HZ800047 ANNUAL REPLACEMENT KIT CHART Real Size ...

Page 5: ...9 MC9 S C MC5 Annual replacement kit Cod N HZ 800047 Use only Cressi sub spare parts Note it is recommended to carry out a complete servicing of the regulator yearly or more frequently in case of intensive use Real Size Go back to January 2009 Rev MC9 B Ed C 13 ...

Page 6: ...equipment are illustrated in a section of this document on page 8 Metal parts must be washed with hot water and neutral detergent and rinsed in fresh water Any concretions must be removed using ultrasound cleaning or with diluted acid solutions always followed by long and thorough rinsing under running water Do not use acids or solvents on rubber components The new ORs must be greased with a thin ...

Page 7: ... oxygen 79 nitrogen Users must never perform maintenance themselves all maintenance must be performed EXCLUSIVELY by an authorized Cressi Sub center You can find your authorized Cressi Sub center by asking your dealer or Cressi Sub S p A itself by sending an e mail to info cressi sub it MC9 1st stage Annual replacement Use only original Cressi sub replacement parts January 2009 Rev MC9 B Ed C 13 ...

Page 8: ...Regulators repair and maintenance 8 1 stage MC9 Special tools January 2009 Rev MC9 B Ed C 13 ...

Page 9: ...gs Use a plastic tool or a round pointed metal one in order not to damage the O ring seat To replace the O ring correctly press its sides to create a bulge inside which to insert the round pointed tool as shown in the pictures Attention USE ONLY ORIGINAL CRESSI SUB SPARE PARTS January 2009 Rev MC9 B Ed C 13 ...

Page 10: ...age disassembling phases In case the regulator has been used under water for a long time and shows oxidation traces it may be useful to tap gently with a plastic hammer all along the perimeter of the area to be removed January 2009 Rev MC9 B Ed C 13 ...

Page 11: ...Regulators repair and maintenance 11 MC9 1st stage INT disassembling phases January 2009 Rev MC9 B Ed C 13 ...

Page 12: ...C9 1st stage INT disassembling phases Remove the bracket nut using the special spanner as shown in the picture After inserting the threaded tool in one of the first stage ports tighten the regulator in a vice January 2009 Rev MC9 B Ed C 13 ...

Page 13: ...e Erogatori 13 MC9 1st stage INT disassembling phases In case the special spanner is not available the bracket nut can be removed using a large adjustable spanner as shown in the picture HZ 709018 January 2009 Rev MC9 B Ed C 13 ...

Page 14: ...Regulators repair and maintenance 14 MC9 1st stage INT disassembling phases Remove the 1st stage bracket nut and bracket 2 HZ 770080 4 HZ 800054 Continues on page 20 January 2009 Rev MC9 B Ed C 13 ...

Page 15: ...Regulators repair and maintenance 15 MC9 1st stage DIN disassembling phases 25 K Kit OR DIN HZ 800066 January 2009 Rev MC9 B Ed C 13 ...

Page 16: ...enance 16 MC9 1st stage DIN disassembling phases Using the threaded bar tighten the 1st stage in a vice Unscrew the DIN connector from the relating thread on the DIN filter using a 6 mm allen wrench January 2009 Rev MC9 B Ed C 13 ...

Page 17: ...rning in case the disassembling operations are difficult do not carry out them with any wrench extensions since this might damage details of the equipment In such case please contact Cressi sub at once before carrying out any disassembling operation January 2009 Rev MC9 B Ed C 13 ...

Page 18: ...Regulators repair and maintenance 18 MC9 1st stage DIN disassembling phases Remove the DIN connector ring from the DIN filter body January 2009 Rev MC9 B Ed C 13 31 HZ 800046 ...

Page 19: ...page 20 Unscrew the DIN filter body using a 24 mm hexagonal spanner as shown in the picture Pay particular attention unscrewing the thread causes the inner valve spring to lessen its resistance which might make the inner valve dart out of its seat 30 HZ 800049 January 2009 Rev MC9 B Ed C 13 ...

Page 20: ...Regulators repair and maintenance 20 MC9 1st stage disassembling phases Remove the sintered filter and take out the first stage valve completely 10K HZ 800058 6 HZ 800056 January 2009 Rev MC9 B Ed C 13 ...

Page 21: ...nce 21 MC9 1st stage disassembling phases Remove the bracket nut O Ring same as the DIN filter one and take the HP jacket piston bush completely out of its seat 11 HZ 800059 5 OR HZ 800055 4 HZ 800054 January 2009 Rev MC9 B Ed C 13 ...

Page 22: ...Regulators repair and maintenance 22 MC9 1st stage disassembling phases Remove the push pin 17 HZ 800041 January 2009 Rev MC9 B Ed C 13 ...

Page 23: ... MC9 1st stage disassembling phases Take out the interchangeable nozzle inserting the special tool curved end very carefully under its edge so that you can use it to contrast the O ring frictional resistance January 2009 Rev MC9 B Ed C 13 ...

Page 24: ...9 1st stage disassembling phases The especially shaped tool combined with the sturdiness of the stainless steel nozzle allows to take it out safely without any risk of damage 28 HZ 800042 29 HZ 800043 HZ 709016 January 2009 Rev MC9 B Ed C 13 ...

Page 25: ... disassembling phases In case the regulator has been used under water for a long time and shows oxidation traces it may be useful to tap gently with a plastic hammer all along the perimeter of the first stage closing disk January 2009 Rev MC9 B Ed C 13 ...

Page 26: ...e disassembling phases Keeping the first stage tightened in the vice through the threaded bar remove the closing disk using a 30 mm hexagonal spanner Then remove the 1st stage setting spring and guide plate 22 HZ 800063 January 2009 Rev MC9 B Ed C 13 ...

Page 27: ...Regulators repair and maintenance 27 MC9 1st stage disassembling phases Introduce low pressure air through a 3 8 LP port to remove the diaphragm from its seat January 2009 Rev MC9 B Ed C 13 ...

Page 28: ...aphragm closing disk Diaphragm Pin pusher pin HZ 800065 HZ 800064 HZ 800080 HZ 800063 HZ 800062 HZ 800082 HZ 800062 HZ 800061 16K HZ 800040 HP piston jacket HZ 800059 Complete HP valve 10K HZ 800058 HP Piston HZ 800085 Filter HZ 800056 Bracket nut HZ 800054 Nozzle 28 HZ 800042 Nozzle O Ring 29 HZ 800043 January 2009 Rev MC9 B Ed C 13 ...

Page 29: ...g screw Diaphragm closing disk Diaphragm Pin pusher pin HZ 800065 HZ 800064 HZ 800063 HZ 800082 HZ 800062 HZ 800061 16K HZ 800040 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 hand wheel DIN 300 connector Nozzle 28 HZ 800042 HZ 800049 January 2009 Rev MC9 B Ed C 13 HZ 800046 ...

Page 30: ...ge assembling phases After lubricating it carefully insert the O Ring into the interchangeable nozzle seat Insert the nozzle into its seat inside the first stage body as shown in the picture 29 OR HZ 800043 28 HZ 800042 January 2009 Rev MC9 B Ed C 13 ...

Page 31: ... repair and maintenance 31 MC9 1st stage INT DIN assembling phases 7K HZ 800057 January 2009 Rev MC9 B Ed C 13 Insert the backup ring into the HP housing being careful not to scratch its internal sealing surface ...

Page 32: ...1st stage INT DIN assembling phases After lubricating it carefully insert the O Ring into the balancing chamber Note a rich and thorough lubrication is unavoidable to make the HP valve work perfectly 7K HZ 800057 January 2009 Rev MC9 B Ed C 13 ...

Page 33: ... assembling phases Place the piston spring on the balancing chamber and the HP piston inside it as shown in the picture Note Make sure the hole through the HP piston stem is NOT blocked up with impurities 7K HZ 800057 9 HZ 800085 January 2009 Rev MC9 B Ed C 13 ...

Page 34: ...ulators repair and maintenance 34 MC9 1st stage INT DIN assembling phases Insert the new HP piston jacket bush into the first stage body as shown in the picture 11 HZ 800059 January 2009 Rev MC9 B Ed C 13 ...

Page 35: ...Regulators repair and maintenance 35 MC9 1st stage INT DIN assembling phases Insert the assembled HP valve into the first stage body as shown in the picture 10K HZ 800058 January 2009 Rev MC9 B Ed C 13 ...

Page 36: ...Regulators repair and maintenance 36 MC9 1st stage INT DIN assembling phases Place the sintered filter on the valve as shown in the picture 6 HZ 800056 January 2009 Rev MC9 B Ed C 13 ...

Page 37: ...Regulators repair and maintenance 1 2 37 MC9 1st stage INT DIN assembling phases Click 1 for INT assembling procedure Click 2 for DIN assembling procedure January 2009 Rev MC9 B Ed C 13 ...

Page 38: ...Riparazione e Manutenzione Erogatori 38 MC9 1st stage INT assembling phases January 2009 Rev MC9 B Ed C 13 ...

Page 39: ...NT bracket between the nut and the first stage body Press the nut onto the filter and overcome the spring resistance down to the thread inside the first stage body Screw the nut completely keeping the first stage firmly on the work top so that the O ring will be placed correctly into its seat January 2009 Rev MC9 B Ed C 13 ...

Page 40: ...Regulators repair and maintenance 40 MC9 1st stage INT assembling phases Bracket nut blocking with dynamometric wrench 30 N x m Continues on page 48 January 2009 Rev MC9 B Ed C 13 ...

Page 41: ...Regulators repair and maintenance 41 MC9 1st stage DIN assembling phases 25 K DIN O Rings kit HZ 800066 January 2009 Rev MC9 B Ed C 13 ...

Page 42: ...Regulators repair and maintenance 42 MC9 1st stage DIN assembling phases After lubricating it insert the DIN filter body O Ring into its seat 26K HZ 800067 5 OR HZ 800055 January 2009 Rev MC9 B Ed C 13 ...

Page 43: ...DIN filter body onto the filter and overcome the spring resistance down to the inner thread of the first stage body Screw the filter body completely keeping the first stage firmly on the work top so that the O ring will be placed correctly into its seat January 2009 Rev MC9 B Ed C 13 ...

Page 44: ...enance 44 MC9 1st stage DIN assembling phases Tighten the first stage body in a vice through the threaded bar Tighten the DIN filter body with a 24 mm hexagonal dynamometric wrench applying 30 N x m January 2009 Rev MC9 B Ed C 13 ...

Page 45: ...Regulators repair and maintenance 45 MC9 1st stage DIN assembling phases Insert the DIN connector ring onto the DIN filter body 26K HZ 800067 January 2009 Rev MC9 B Ed C 13 ...

Page 46: ...Regulators repair and maintenance 46 MC9 1st stage DIN assembling phases After lubricating them carefully insert the DIN connector O Rings into their seats January 2009 Rev MC9 B Ed C 13 ...

Page 47: ...st stage DIN assembling phases Screw the DIN connector onto the relating thread of the DIN filter body using a 6 mm Allen wrench Tighten it using a 6 mm hexagonal dynamometric wrench applying 10 N x m January 2009 Rev MC9 B Ed C 13 31 HZ 800046 ...

Page 48: ...ge assembling phases After connecting the HP valve including the filter through either the bracket nut for INT model or the DIN filter body for DIN model turn the body and insert the push pin into its seat 17 HZ 800041 January 2009 Rev MC9 B Ed C 13 ...

Page 49: ...Regulators repair and maintenance 49 MC9 1st stage assembling phases Insert the pin pusher and push softly to make sure the device works correctly 18 HZ 800062 January 2009 Rev MC9 B Ed C 13 ...

Page 50: ... HZ 800082 January 2009 Rev MC9 B Ed C 13 Insert the diaphragm in the housing inside the body making sure it that it is seated correctly in its operating position Then pressing lightly on the diaphragm check that the mechanism functions correctly in its operating position ...

Page 51: ...ulators repair and maintenance 51 MC9 1st stage assembling phases Screw the diaphragm closing disk completely using a 30 mm dynamometric wrench applying 30 N x m 22 HZ 800063 January 2009 Rev MC9 B Ed C 13 ...

Page 52: ...Regulators repair and maintenance 52 MC9 1st stage assembling phases Insert the spring washer into the first stage setting screw 23 HZ 800064 January 2009 Rev MC9 B Ed C 13 ...

Page 53: ...spring guide plate onto the spring itself and connect the whole with the first stage as shown in the picture Screw without over tightening the setting screw onto its threaded seat until the plate will adhere to the diaphragm 20 HZ 800081 21 HZ 800080 January 2009 Rev MC9 B Ed C 13 ...

Page 54: ...nce 54 MC9 1st stage assembling phases Screw the setting screw onto the threaded seat of the diaphragm closing disk using a 6 mm Allen wrench before carrying out the correct setting of the first stage January 2009 Rev MC9 B Ed C 13 ...

Page 55: ...nk or with an equally pressurized workbench Note even though the regulator is overbalanced that is the intermediate pressure increases as tank pressure decreases it s a good idea to calibrate the first stage to 200 bar to properly control how the regulator functions Intermediate pressure will rise slightly as pressure in the tank drops circa 0 6 bar at tank 50 bar Turn slowly the air valve on whil...

Page 56: ... intermediate pressure Turning it anticlockwise the pressure will on the contrary decrease Note make sure to discharge the regulator before setting the intermediate pressure in order to avoid incorrect reading on the gauge Make sure the intermediate pressure is reached swiftly and stays so and does not increase after pressing the second stage discharge button for more times After the setting when ...

Page 57: ...Regulators repair and maintenance 57 MC9 1st stage setting D 1 bar January 2009 Rev MC9 B Ed C 13 ...

Page 58: ...Regulators repair and maintenance January 2009 Rev MC9 B Ed C 13 58 MC9 1st stage Service records Download Tab ...

Page 59: ...Regulators repair and maintenance January 2009 Rev MC9 B Ed C 13 59 MC9 1st stage Service records Download Tab Maintenance Service Record ...

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