Festo DGC G Series, Repair Instructions

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25 / 44 Festo 7DGC-KFa_en
Assembling the linear drives 4.2.2
When assembling a linear drive, wearing parts, such as the sealing band, cover band, seals and the complete piston,
can be replaced.
The wearing parts are ordered from the online spare parts catalogue (spareparts.Festo.com) quoting the appropriate part
number (dependent on the size of the linear drive).
The part number is an x-stroke part number. In addition to the part number, you must also specify the stroke of your
linear drive when ordering. The stroke can be determined from the type code on the name plate of the linear drive
(see order example below). Using this information you can calculate the necessary length or sealing band/cover band.
Cutting the new sealing band/cover band to length
The exact length of the sealing band and cover band is determined by the 0-stroke of the respective type and the stroke
of the linear drive. The stroke is specified by the type code on the name plate. Check the length of the new sealing band
and cover band and shorten them to length (0-hub + hub) as necessary. See order example.
Type Length L
0
DGC-18-…-KF 220 mm
DGC-25-…-KF 250 mm
DGC-32-…-KF 290 mm
DGC-40-…-KF 335 mm

Example: DGC-25-330-KF
0-stroke:
250 mm
Stroke: 330 mm
Length of the sealing band / cover band =
0- stroke = 580 mm
The length of the bands calculated in this way is a theoretical value. Component tolerances may make it necessary to
adjust the length of the sealing band/cover band after installation.
Note
Sturdy general purpose scissors or metal shears are best for cutting the sealing band and cover band.
Warning
Do not bend the sealing band and the cover band as this may cause damage or tearing and reduce the service life of
the sealing band/cover band.
Greasing whilst assembling
When assembling the linear drives, various components have to be greased in accordance with the table below.
Component Lubricant Greasing instructions
Cylinder barrel Festo LUB-KC1 1) Apply a layer of grease to the slot and all around and along the entire length of
the cylinder bore.
Sealing band Festo LUB-KC1
1)
Apply a layer of grease all around and along the entire length.
Cover band Festo LUB-KC1
1)
Apply a layer of grease all around and along the entire length.
Piston Festo LUB-KC1
1)
Grease all around.
Seal, piston,
outside Festo LUB-KC1
1)
Grease all around.
Seal, piston,
inside Festo LUB-KC1
1)
Grease all around.
Cushion piston Festo LUB-KC1
1)
Grease all around.
Seal, buffer Festo LUB-KC1
1)
Grease all around.
Band reverser Festo LUB-KC1
1)
Grease in the deflection area.
1)
See “Assembly aids” in the online spare parts catalogue on the Festo website (www.Festo.com).