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Festo CRDNG Series, Repair Instructions, Page: 17 / 26

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Festo 7CRDNGb_en

4.4 

Repairing the cylinder CRDNG(S)-…-S6

The description in this chapter can be used to repair cylinders of the type CRDNG(S)-…-S6 with the following features:

CRDNG

CRDNGS (with swivel flange)

Code Description

Code Description

PPV

Adjustable pneumatic cushioning

PPV

Adjustable pneumatic cushioning

A

External position sensing

A

External position sensing

4.4.1 

Structure of the bearing cap

Note

In some series and variants the bearing and end caps may differ from the versions shown here. The precise design 
of the bearing and end caps must be determined before each repair using the parts lists in the online spare parts 
catalogue on the Festo website (

spareparts.festo.com

) and taken into consideration during the repair. 

Bearing cap CRDNG(S)-…-S6

1

2

5

4

6

3

1

  Bearing cap

2

 O-ring

3

  Cushioning seal

4

  Piston rod seal

5

  Retaining ring

6

 Bearing

4.4.2 

Removing the bearing and end caps

• 

Loosen the screws in the bearing cap from the tie rods and remove them.

• 

Remove the bearing and end caps from the cylinder barrel and piston rod.

• 

Loosen the tie rods in the end cap and remove them.

• 

Remove any residue of the screw locking agent from the threads of 
the screws and tie rods.

4.4.3 

Replacing the piston components

• 

Pull the piston rod out of the cylinder barrel.

• 

Check the cylinder barrel and piston rod for damage.
The entire cylinder must be replaced if the cylinder barrel 

(particularly the bearing surface) is showing significant damage.

Summary of Contents for CRDNG Series

Page 1: ...Repair instructions en Cylinder with piston rod Standard cylinder to ISO 15552 stainless steel CRDNG CRDNGS 7CRDNGb_en ...

Page 2: ...oduction distribution or sale of this document or communication of its contents to others without express authorisation is prohibited Offenders will be liable for damages All rights reserved in the event that a patent utility model or design patent is registered All product designations and brand names used are the property of the owners and not explicitly identified as such All technical data are...

Page 3: ...viations into consideration if necessary These repair instructions have been prepared with care Festo AG Co KG does not however accept liability for any errors in these repair instructions or their consequences Likewise no liability is accepted for direct or consequential damage resulting from improper use of the products More detailed information on this can be found in chapter 8 Liability The re...

Page 4: ...ts 13 4 3 4 Inserting the piston rod into the cylinder barrel 13 4 3 5 Repairing and attaching the bearing and end caps 14 4 4 Repairing the cylinder CRDNG S S6 17 4 4 1 Structure of the bearing cap 17 4 4 2 Removing the bearing and end caps 17 4 4 3 Replacing the piston components 17 4 4 4 Inserting the piston rod into the cylinder barrel 18 4 4 5 Repairing and attaching the bearing and end caps ...

Page 5: ...website www Festo com Spare parts documentation Contains an overview of the spare and wearing parts as well as information on their installation Can be found in the online spare parts catalogue on the Festo website spareparts festo com Assembly aids Contain an overview of available assembly aids such as lubricating greases screw locking agents maintenance tools etc aids for assembly and maintenanc...

Page 6: ...sales office offers the option of having the repair carried out by Festo Environment Components and equipment replaced as part of a repair must be disposed of in accordance with the locally valid environmental protection regulations 2 General product description 2 1 Functional description The piston moves in the cylinder barrel when the cylinder chamber is pressurised The piston rod transmits the ...

Page 7: ...w Festo com 2 3 Repair relevant features Some of the features that the cylinder with piston rod can be equipped with require a different repair approach These are referred to as repair relevant features and are listed in the left hand column in the table below If the cylinder to be repaired has one of these repair relevant features the appropriate repair description see right hand column in the ta...

Page 8: ...tation designations of the cylinder with piston rod as well as the different variants of the bearing cap and seals for repair relevant features Orientation Festo product identification rating plate as reference point O top U underneath R right L left V front H rear Key features S6 Heat resistant seals S2 Through piston rod ...

Page 9: ...re and wearing parts please use the online spare parts catalogue on the Festo website spareparts festo com 1 14 15 14 15 19 26 27 20 20 21 21 22 22 23 13 24 24 25 25 26 20 20 20 21 21 22 22 26 21 22 23 20 20 33 20 21 22 23 24 24 28 29 30 32 31 16 17 18 34 2 3 4 5 1 3 4 5 6 8 9 10 7 11 6 8 9 10 7 11 6 8 9 10 7 36 6 8 9 10 7 35 12 13 12 19 ...

Page 10: ...iston rod 17 Tie rod Use screw locking agent 18 Collar nut Use screw locking agent 19 Cushioning boss 20 Lip ring piston seal 21 Piston two piece Not with CRDNG S 125 22 O ring Not with CRDNG S 125 23 Slip ring 24 O ring With CRDNG S 32 40 50 63 80 100 25 Washer Only with CRDNG S 32 26 Ring magnet Not with CRDNG S 125 27 Magnetic strip Only with CRDNG S 125 28 O ring Only with CRDNG S 125 29 Pisto...

Page 11: ...nly released when the cylinder is opened To prevent damage to sealing rims or guide surfaces do not use pointed or sharp edged assembly aids 4 2 Visual inspection Check the cylinder for visible damage that might impair its function e g warping of the piston rod as well as deposits and scoring The entire cylinder must be replaced if the cylinder barrel is showing significant damage 4 3 Repairing th...

Page 12: ...6 7 8 4 5 3 1 Bearing cap 2 O ring 3 Cushioning seal 4 Sleeve 5 O ring 6 Piston rod seal 7 Bearing 8 Adapter 4 3 2 Removing the bearing and end caps Loosen the screws in the bearing cap from the tie rods hold the screws in the second bearing cap in place on cylinders with through piston rod S2 and remove them Remove the bearing and end caps both bearing caps on cylinders with through piston rod S2...

Page 13: ... order Apply the screw locking agent included in the set of wearing parts to the inside of the threaded coupling the rear part of the piston rod on cylinders with through piston rod S2 and screw it onto the piston rod with the corresponding torque see table Type Torque CRDNG S 32 CRDNG 32 S2 10 Nm CRDNG S 40 CRDNG 40 S2 20 Nm CRDNG S 50 CRDNG 50 S2 30 Nm CRDNG S 63 CRDNG 63 S2 30 Nm CRDNG S 80 CRD...

Page 14: ...n cylinders with through piston rod S2 Remove the piston rod seal from the bearing cap the front and rear bearing caps on cylinders with through piston rod S2 Remove the cushioning seal from the bearing cap and end cap the rear bearing cap on cylinders with through piston rod S2 Only with CRDNG 125 PPV A S2 Remove the sleeves with the cushioning seals from the bearing caps Remove the O rings behin...

Page 15: ...urface for bearing cap Thin film2 3 Grease reservoir1 for bearing Fill 2 3 with grease 1 See chapter 5 2 3 Grease reservoir 2 See chapter 5 2 2 Thin grease film 1 2 3 Insert the piston rod seal into the bearing cap in both bearing caps on cylinders with through piston rod S2 using an appropriate thrust piece Note Note the mounting direction individual sealing lips facing out Grease the new O rings...

Page 16: ...th the piston onto the end cap To protect the bearing and seals place the appropriate mounting sleeve see chapter 7 2 Special tools on the thread of the piston rod to prevent damage Guide the bearing cap both bearing caps on cylinders with through piston rod S2 over the mounting sleeve onto the piston rod as far as the cylinder barrel Screw the screws in the bearing cap onto the tie rods hold the ...

Page 17: ...line spare parts catalogue on the Festo website spareparts festo com and taken into consideration during the repair Bearing cap CRDNG S S6 1 2 5 4 6 3 1 Bearing cap 2 O ring 3 Cushioning seal 4 Piston rod seal 5 Retaining ring 6 Bearing 4 4 2 Removing the bearing and end caps Loosen the screws in the bearing cap from the tie rods and remove them Remove the bearing and end caps from the cylinder ba...

Page 18: ...0 Nm 4 4 4 Inserting the piston rod into the cylinder barrel Clean the inner surface of the cylinder barrel as described in chapter 5 1 Cleaning Apply the grease included in the set of wearing parts to the following parts Component Greasing Inner surface of cylinder barrel Thin film1 Surface of piston rod Thin film1 Piston seal lip rings Thin film1 on outside Piston surface between lip rings greas...

Page 19: ...Remove the O ring from the groove of the bearing cap and end cap Remove the cushioning seal from the bearing cap and end cap Warning Check the plain bearing in the bearing cap for visible damage that might impair its function such as deposits and scoring The entire bearing cap must be replaced if the plain bearing is showing significant damage Only when repairing the adjustable cushioning PPV Note...

Page 20: ...cap using an appropriate thrust piece Note Note the mounting direction individual sealing lips facing out Compress the retaining ring e g using pliers and place it on the piston rod seal Grease the new O rings and insert them into the grooves in the bearing cap and end cap Apply a thin film of grease to the new cushioning seals on the front side of the sealing surface and insert them into the bear...

Page 21: ...g instructions enclosed with the cylinder or can be called up on the Festo website www Festo com and commission the repaired cylinder 4 5 Repairing the adjustable end position cushioning PPV Note The end position cushioning PPV cannot be disassembled on cylinders with a piston diameter of 32 mm Components of the end position cushioning PPV 1 Bearing cap 2 Outer threaded insert 3 Egulating screw 4 ...

Page 22: ...ring 4 from the regulating screw 3 4 3 4 5 2 Assembling the adjustable end position cushioning PPV The adjustable end position cushioning PPV is mounted in the reverse order Grease the new O ring 4 with LUB E1 and insert it into the groove of the regulating screws 3 Grease the new O ring 6 with LUB E1 and insert it into the location hole for the PPV in the bearing cap or end cap Apply screw lockin...

Page 23: ...aded insert 2 Screw the outer threaded insert 2 into the bearing cap or end cap and make sure that the outer threaded insert 2 is fitting securely Perform a functional test as per the operating instructions enclosed with the cylinder or can be called up on the Festo website www Festo com and commission the repaired cylinder ...

Page 24: ...cylinder barrel to produce an even lubricant film 5 2 1 Extremely thin grease film A barely continuous film of grease covers the bearing surface The grease can give a sheen to the surface however the colour of the grease must not darken it Recommendation Apply the grease using a cloth or similar dipped in the grease Remove the excess grease from the seal system components e g by drawing the assemb...

Page 25: ...iston rod The mounting sleeve for piston rods for protecting the piston rod seal and the bearing in the bearing cap while the repair is being carried out must be produced by the customer The schematic diagram can be found in the information brochure Accessories equipment and tools 7Accessories_a_en Documents Further information on the special tools and schematic diagrams can be found in the inform...

Page 26: ...g further developed with regard to hardware and software The hardware status and where applicable the software status of the product can be found on the type plate of the product If the electronic documentation no matter in what form does not directly accompany the product i e if the product is not supplied together with a portable data storage medium floppy disk CD Rom removable disk Festo does n...

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