Stocchetta Cilindri S.r.l. – Via Capretti n°14 , 25136 Brescia – Italia –
ISO 3320 Hydraulic cylinders
SL 250 – SL 350 Series Use and maintenance manual APP 0005-4.2014 REV.00
Revisione Data Emissione Modifiche
00 01/01/2015 PRIMA EMISSIONE
APP 0005-4.2014 SL SERIES – USE AND MAINTENANCE MANUAL
Stocchetta Cilindri S.r.l. – Via Capretti n°14 , 25136 Brescia – Italy –
Table of matters
1 Product information
1.1 Description
1.2 Technical specifications
1.3 General product description
2 Use of manual
2.1 Safety symbols
2.2 General information
3 Decommissioning
3.1 Preparation to decommissioning
3.2 How to carry out the decommissioning
3.3 Disassembly preliminary operations
4 Repair and spare parts
4.1 Repair
4.2 Spare parts
5 Maintenance/ replacement of parts subject to wear
5.1 Maintenance of cushioning adjustment cartridges
5.2 Replacement of seals of the rod guide bushing
5.3 Replacement of piston seals
5.4 Inductive proximity switches installation and calibration
APP 0005-4.2014 SL SERIES – USE AND MAINTENANCE MANUAL
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1 Product information
1.1 Description
A hydraulic cylinder converts hydraulic energy into a linear movement. The driving force is
determined by the hydraulic pressure inside the cylinder chamber on the piston surfaces and
cylinder ring.
Fig.1 Cylinder SL main components:
1 Rod
2 Flange
3 Oil connections
4 Cylinder front head
5 Threaded flanges
6 Cylinder barrel
7 Cylinder end cap (or cylinder
rear head)
The Stocchetta Cilindri SL 250 and SL 350 series of hydraulic double acting cylinders and servo-
cylinders has been conceived to meet the most demanding requirements for heavy duty uses in the
iron and steel sector, in compliance with ISO 3320 and DIN 24334 construction standards.
The round-headed design and the careful choice of materials and seals used, added to the rigorous
final testing procedures reproducing normal cylinder operating conditions, make these hydraulic
actuators the peak of technology in the hydraulic actuation field for all types of industrial
applications, particularly under critical operating conditions such as those in steel plants where sturdy,
reliable and easy-to-maintain products are required.
1 3 2 7 5 7 6 2 4
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1.2 Technical specifications
Interchangeability
dimensions In compliance with ISO 3320 and DIN 24334 standards
Nominal operating
pressure (non-stop
operation)
SERIES SL 250: 250 bar (25 MPa)
SERIES SL 350: 350 bar (35 MPa)
Rod diameters Depending on bore type, 2 diameters are available from 20 mm
to 220 mm.
Stroke
Upon customer’s request, with dimensional tolerances as
follows:
0-500 +/- 1.5
501-1250 +/- 2
1251-3000 +/- 3
3001-8000 +/- 5
Max. standard speed 0.5 m/s
Standard temperature From -20°C to +100°C
Standard hydraulic fluid Mineral oil. Alternatively, HFC, HFD, HFA
Mounting pieces and
accessories
Interchangeable dimensions and mounting pieces with:
series CD 250 and DIN 200/250;
series CD 350 and DIN 350;
completed by a wide range of accessories to satisfy any kind of
operative requirements.
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1.3 General product description
Fig. 2
The rod (A) has been obtained from bars of hardened and tempered, high-strength, thick
chrome-plated alloy steel and honed with roughness Ra=0.2 µm
The front and rear pistons (P) with packing seals are made of alloy steel and ensure highest
reliability also in heavy-duty conditions. The standard configuration foresees two pistons
separated by a bronze guide slewing ring (E) and equipped with packing seals (D). Upon
request, also a Low Friction configuration (see Fig. 3) is available.
Fig. 3 – Low friction layout
1 GLYD RING seals
2 Guide rings
3 Enbloc piston
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The cylinder head (T), made of high-strength steel, is precision-machined to ensure perfect
alignment between the surfaces and also perfect concentricity of the seat of the rod guide
bushing with cylinder axis. The hydraulic circuit connection has been positioned on the head,
which is bolted to the barrel by means of the threaded flange (G) and, upon request, vents
and braking valves are also available.
Tightening torques of the screws used to lock the head in place are given in the following
tables:
TIGHTENING TORQUES TABLE FOR SL 250 CYLINDERS
Bore 40 50 63 80 100 125 140 160 180 200 220 250 280 320
Screws M 8 M 10 M 12 M 12 M 16 M 20 M 20 M 27 M 27 M 30 M 33 M 36 M 39 M 42
Torque (Nm) 30 58 100 100 180 350 350 850 850 1300 1800 2500 3300 4000
TIGHTENING TORQUES TABLE FOR SL 350 CYLINDERS
Bore 40 50 63 80 100 125 140 160 180 200 220 250 280 320
Screws M 8 M 10 M 12 M 12 M 16 M 20 M 20 M 27 M 27 M 30 M 33 M 36 M 39 M 42
Torque (Nm) 30 58 100 100 180 350 350 850 850 1300 1800 2500 3300 4000
Tab. 1
The barrel (E), has been obtained from a large thickness, seamless tube made of high-strength
steel; it is internally lapped to improve sliding and to ensure long life to seals. The barrel has
been dimensioned on account of the regulations in force and, therefore, the required nominal
pressures. The dimensioning is such that the bulking of the barrel, due to internal pressure,
remains within the limits ensuring the proper working of piston seals and guide rings. Upon
request, it can be internally chrome-plated.
The end cap (F), is precision machined to guarantee perfect alignment between the surfaces
and perfect concentricity. A connection to the hydraulic circuit is located on the end cap and,
upon request, vents and braking valves are also available. The end cap is bolted to the barrel
by means of the relevant threaded flange (G).
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The rod guide bushing (B) is made of high wear-resistant bronze. The surface of the guide
bushing supports the rod when it slides. Bushing configuration, provided with seals, can be:
- DIAMETERS 40 – 50: threaded and screwed in the cylinder head;
- DIAMETERS 63 – 80 – 100 – 125 – 140 SMALL ROD: fitted in a precision seat and locked by
an easy-to-disassemble front flange (N), bolted to the cylinder head;
- DIAMETERS 63 – 80 – 100 – 125 – 140 LARGE ROD: threaded and screwed in the cylinder
head;
- DIAMETERS EXCEEDING 160 WITH ANY KIND OF ROD: fitted in a precision seat and locked
by an easy-to-disassemble front flange (N), bolted to the cylinder head.
The table below illustrates the tightening torques relevant to the clamping screws of the front
flange:
TIGHTENING TORQUES TABLE FOR SL 250 CYLINDERS
Bore 63* 80* 100* 125* 140* 160 180 200 220 250 280 320
Screws M 6 M 8 M 8 M 10 M 10 M 12 M 14 M 14 M 16 M 18 M 18 M 18
Torque (Nm) 6 30 30 58 58 100 160 160 250 340 340 340
TIGHTENING TORQUES TABLE FOR SL 350 CYLINDERS
Bore 63* 80* 100* 125* 140* 160 180 200 220 250 280 320
Screws M 6 M 8 M 8 M 10 M 10 M 12 M 14 M 14 M 16 M 18 M 18 M 18
Torque (Nm) 6 30 30 58 58 100 160 160 250 340 340 340
Tab. 2 * Only for small rod.
The scraper (R) is positioned in the flange thus ensuring the cleaning of the rod when it
retracts.
A Low Friction configuration (see fig. 4) is possible also for the rod guide bushing.
Fig. 4 – Bushing – low friction configuration
1. Front flange
2. STEPSEAL seals
3. Rod guide bushing
4. Head
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The seals must be chosen according to the operating conditions of the system: speed,
frequency, kind of fluid and temperature. Cylinder seals are, primarily:
- Static (S), used between two non-moving parts. For instance, the seals between head (or
end cap) and barrel or between rod and piston.
- Dynamic (D), used between moving parts. For instance, the seals between rod and bushing
or between piston and barrel.
- Guide rings, they ensure the correct sliding between piston and barrel.
The seals must be replaced at regular intervals.
The kits fitted to the cylinder (and for possible replacement) are: standard, high temperatures
or aggressive fluids, water glycol, low friction.
The front and rear cushioning is gradual action and has been realized by means of cushion
rings with special profile for gradual cushioning and absence of pressure peaks.
Upon request, air vents can be installed on the heads; they enable air bleeding which forms
upon start-up, when the entire cylinder stroke is not exploited or when the fitting connections
are not facing upwards.
The spacers, suggested for strokes exceeding 1000 mm, increase the rod and piston guide,
thus avoiding overloads and early wearing.
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2 Use of manual
This use and maintenance manual describes the cylinder ISO 3320, its components and its
relevant operations. Before starting any operation implying use, general maintenance of the
cylinder (see chapter no. 11 of basic manual STC001-2.2013), handling and storage (see
chapters no. 6 and 7 of basic manual STC001-2.2013), read this manual and basic manual
STC001-2.2013 carefully.
The handbook contains 34 pages.
2.1 Safety symbols
DANGER
Identifies a dangerous situation which, if not avoided,
may cause death or serious body injuries.
CAUTION
Identifies a dangerous situation which, if not avoided,
may cause slight up to medium-serious body injuries
NOTICE
Information which, if used, protects the product
and/or the environment from material damages.
IMPORTANT
Instructions for a better use of the cylinder when in
operation or adjustment and/or maintenance
instructions.
GLOVES The use of protective gloves is compulsory
LUBRICATION Proper lubrication of the components
MAINTENANCE
Instructions for a correct disassembly/re-assembly of
cylinder components during routine and/or
extraordinary maintenance.
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2.2 General information
The original cylinder configuration shall not be modified for any reason whatever without the
explicit consent of Stocchetta Cilindri S.r.l. .
Before starting any operation, carefully read all the directions stated in the chapter “Safety
warnings” of the basic manual STC001-2.2013.
The opening of the hydraulic cylinder will result in the cancellation of any warranty right.
This manual and the information therein contained have been conceived for skilled technical
staff. Stocchetta Cilindri S.r.l. disclaims all liability for damages due to misuse of the
information contained in this manual. The content of this manual can be modified without any
notice. Due to technological developments, the illustrations and descriptions contained in this
manual may differ, in the details, from the actually supplied cylinder. In case of problems or
for any information, contact the after-sales service.
Upon goods receipt verify that:
• The packaging is unimpaired and not damaged. In case of damages
immediately inform Stocchetta Cilindri S.r.l.
• The supply corresponds to order specifications
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3 Decommissioning
3.1 Preparation to decommissioning
DANGER
HIGH OPERATING PRESSURE IN THE HYDRAULIC CYLINDER AND IN THE SYSTEM
Danger of injuries or damages to things due to mobile parts or oil leakage during operation!
• Disable all power transmission components and all the connections (electrical,
pneumatic, hydraulic) according to the manufacturer’s indications; secure the
installation against restart and, if possible, remove the main safety element of
the installation
• Release the cylinder from external forces, if any
• Depressurize the accumulators on the oil side - if any
Upon decommissioning and disassembly of the hydraulic cylinder from the system, do as
follows:
• Due to safety reasons, lines, ports and components cannot be
disconnected as long as the system is under pressure. First of all
lower the loads, depressurize the pressure accumulator, switch off
the pumps and ensure the system against re-start
• Provide for sufficiently capacious collection tanks to contain the
whole oil volume
3.2 How to carry out the decommissioning
In order to carry out the decommissioning follow these steps:
• Let the oil flow into the prearranged collection tanks
• Verify that all lines and services are completely empty
• Carry out venting, if necessary
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3.3 Disassembly preliminary operations
Before carrying out any operation on the hydraulic cylinder, take the following measures:
• Get a sufficiently intelligible installation layout and/or list of the spare
parts
• Make use of clean and professional tools. Make sure that the
workstation is clean
• Upon cylinder disassembly, avoid any penetration of impurities inside
of it. Seal the ports with suitable plugs or flanged covers
• Make sure that the cylinder and, in particular, the rod are not
damaged
• Position the hydraulic cylinder and its components on a stable
working table
As concerns cylinder lifting and handling during its disassembly from the system (or
machinery), the same directions set forth in chapter 6 “Handling” of the basic manual
STC0001-2.2013 shall apply.
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4 Repair and spare parts
Please always report to the personnel of Stocchetta Cilindri S.r.l. for any question or
explanation you may need.
The opening of the hydraulic cylinder will result in the cancellation of any warranty right.
4.1 Repair
Stocchetta Cilindri S.r.l. offers complete assistance for hydraulic cylinder repairs. Submit your
requests to our headquarters to the following e-mail address: [email protected]
4.2 Spare parts
NOTICE
MACHINE MALFUNCTION DUE TO THE USE OF UNSUITABLE SPARE PARTS!
Damages to property!
• Exclusively use components listed in the specific product documentation (list
of components)
• Exclusively use new seals and verify their compatibility with the fluid used.
Despite their identical aspect, seal materials may differ; therefore check the
product code
Send spare parts orders directly to headquarters to the e-mail address:
When ordering the spare parts, provide the product code and the cylinder work-order no.
stated on the identification plate. Besides specify, if known, the position of the corresponding
component according to the list of components.
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5 Maintenance/ replacement of parts subject to wear
5.1 Maintenance of cushioning adjustment cartridges
Series SL cylinders are provided with a cushioning adjuster with needle valve. If the
adjustment cartridge leaks, this means that the seals must be replaced.
Fig. 5 – Layout cushioning adjuster
1 Needle
2 Lower nut
3 Cartridge
4 Bonded seal
5 O-ring
6 Back-up ring
Disassembly: Unscrew the complete valve by making use of the suitable wrench. Thoroughly
clean the seat of the bonded seal and pay utmost care that no dirt or foreign bodies enter the
cylinder through the seat of the adjustment needle valve. Firstly unscrew the locking nut and
then the needle of the cartridge by pulling it out from the bottom.
Assembly: replace the O-ring and the back-up ring (Pos. 6), re-position the needle (Pos.1) in
the cartridge (Pos.3) and partially screw the lower nut (Pos. 2). Insert the new bonded seal
(Pos. 4) into the threaded section of the cartridge and screw tight the complete valve in its
seat. Adjust braking again, as set forth in paragraph 3.9 of basic manual STC 0001-2.2013 and
lock the nut in position. In case of leakage from the bonded seal, increase the tightening
torque.
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5.2 Replacement of seals of the rod guide bushing
� Configuration with seals, CHEVRON type;
� Threaded bushing (diam. 40-50) (diam. 63-80-100-125-140 only big-sized rod);
Fig.6
Tab. 3
Pos. No. Description
A 1 Scraper
B 1 Seal, CHEVRON type
C 1+1 O-ring – Backup ring
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Check that the surface of the rod is free from damages that may affect the service life of the
seals.
Unscrew the guide bushing by making use of the four holes for hook-wrench operation and
pull it out, being careful not to damage the rod
After having removed the worn out seals, carry out a thorough washing of all parts in order
that they are clean and check that they are free from metallic particles, scorings or surface
faults of any kind; otherwise, provide also for the replacement of the damaged component. If
necessary, ask Stocchetta Cilindri S.r.l. for components kit – in case of seals and bushing – or
the necessary spare parts.
Lubricate the new seals to be fitted and their seats in the bushing by making use of specific
grease type Polymer 400\0 (to be supplied upon request). The specific feature of grease is to
improve the sensitivity, accuracy, tightness and service life of the seals, thus avoiding sticking
and jerky movements (stick-slip effect), besides facilitating the motions at low speeds by
decreasing the frictions.
Check the correct orientation of the seals with respect to the thrust direction of the hydraulic
fluid as illustrated in the following figure (see Fig. 7).
Fig. 7
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Insert the packing seal into the seat. Assemble the guide bushing, being careful not to damage
the rod and screw it until its limit stop by making use of the four holes for wrench operation.
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� Configuration with seals, CHEVRON type;
� Bolted flange (diam. 63-80-100-125-140 only small-sized rod) (diam. exceeding 140);
Fig. 8
Tab. 4
Pos. No. Description
A 1 Scraper
B 1 Seal, CHEVRON type
C 1+1 O-ring – Backup ring
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Check that the surface of the rod is free from damages that may affect the service life of the
seals.
Unscrew the clamping screws of the front flange and pull it off, being careful not to damage
the rod. Pull out the rod guide bushing.
After having removed the worn-out seals, carry out a thorough washing of all parts in order
that they are clean and check that they are free from metallic particles, scorings or surface
faults of any kind; otherwise, provide also for the replacement of the damaged component. If
necessary, ask Stocchetta Cilindri S.r.l. for components kit – in case of seals and bushing – or
the necessary spare parts.
Lubricate the new seals to be fitted and their seats in the bushing by making use of specific
grease type Polymer 400\0 (to be supplied upon request). The specific feature of grease is to
improve the sensitivity, accuracy, tightness and service life of the seals, thus avoiding sticking
and jerky movements (stick-slip effect), besides facilitating the motions at low speeds by
decreasing the frictions.
Check the correct orientation of the seals with respect to the thrust direction of the hydraulic
fluid as illustrated in the following figure (see Fig. 9).
Fig. 9
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Insert the packing seal into the seat and insert the rod guide bushing. Mount the front flange
being careful not to damage the rod and clamp it by tightening the corresponding screws with
suitable torque (see table Tab. 2 at page 5).
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� Low friction configuration;
� Threaded bushing (diam. 40-50) (diam. 63-80-100-125-140 only big-sized rod);
Fig. 10
Tab. 5
Pos. No. Description
A 1 Scraper
B1 2 STEPSEAL gasket
B2 1 O-ring
C 1+1 O-ring – Backup ring
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Check that the surface of the rod is free from damages that may affect the service life of the
seals.
Unscrew the rod guide bushing by making use of the four holes for pin wrench operation and
pull it out being careful not to damage the rod.
After having removed the worn-out seals, carry out a thorough washing of all parts in order
that they are clean and check that they are free from metallic particles, scorings or surface
faults of any kind; otherwise, provide also for the replacement of the damaged component. If
necessary, ask Stocchetta Cilindri S.r.l. for components kit – in case of seals and bushing –
(see notes at the end of paragraph) or the necessary spare parts.
Lubricate the new seals to be fitted and their seats in the bushing by making use of specific
grease type Polymer 400\0 (to be supplied upon request). The specific feature of grease is to
improve the sensitivity, accuracy, tightness and service life of the seals, thus avoiding sticking
and jerky movements (stick-slip effect), besides facilitating the motions at low speeds by
decreasing the frictions.
Check the correct orientation of the seals with respect to the thrust direction of the hydraulic
fluid as illustrated in the following figure (see Fig. 11).
Fig. 11
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Install the seals in the bushing by operating evenly and avoiding any use of metallic, sharp-
edged tools, being extremely careful not to cause any long-term deformation to the seals.
Position the O-ring, if any, into the groove.
Insert the seal into the groove by pressing it together by hand as illustrated in Fig. 12 or by
making use of special tools as illustrated in Fig. 13. The seal shall be given a “kidney” shape
and shall be free from any edges in its bends.
Fig. 12 Fig. 13
Once the seal has been positioned into the groove, shape it into a ring, by hand and by
pushing in the direction of the arrow (see Fig. 12).
Calibrate the seal directly on the rod only if the latter is provided with a lead-in chamfer.
Otherwise, calibrated gauges may also be used, provided they have a specific chamfer (see Fig.
14).
Fig. 14
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Upon bushing installation, be extremely careful not to damage the newly fitted seals upon
contact with rod thread. Carry out a rotary movement in order to facilitate the coupling of the
rod guide bushing.
Make the bushing slide along the rod and screw it down in the head until its limit-stop, by
making use of the 4 holes for pin wrench operation.
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� Low friction configuration;
� Bolted bushing (diam. 63-80-100-125-140 only small-sized rod) (diameters exceeding 140);
Fig. 15
Tab. 6
Pos. No. Description
A 1 Scraper
B1 2 STEPSEAL gaskets
B2 1 O-ring
C 1+1 O-ring – Backup ring
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Check that the surface of the rod is free from damages that may affect the service life of the
seals.
Unscrew the clamping screws of the front flange and pull it off, being careful not to damage
the rod. Pull out the rod guide bushing.
After having removed the worn-out seals, carry out a thorough washing of all parts in order
that they are clean and check that they are free from metallic particles, scorings or surface
faults of any kind; otherwise, provide also for the replacement of the damaged component. If
necessary, ask Stocchetta Cilindri S.r.l. for components kit – in case of seals and bushing –
(see notes at the end of paragraph) or the necessary spare parts.
Lubricate the new seals to be fitted and their seats in the bushing by making use of specific
grease type Polymer 400\0 (to be supplied upon request). The specific feature of grease is to
improve the sensitivity, accuracy, tightness and service life of the seals, thus avoiding sticking
and jerky movements (stick-slip effect), besides facilitating the motions at low speeds by
decreasing the frictions.
Check the correct orientation of the seals with respect to the thrust direction of the hydraulic
fluid as illustrated in the following figure (see Fig. 16).
Fig. 16
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Install the seals in the bushing by operating evenly and avoiding any use of metallic, sharp-
edged tools, being extremely careful not to cause any long-term deformation to the seals.
Position the O-ring, if any, into the groove.
Insert the seal into the groove by pressing it together by hand, as illustrated in Fig. 17, or by
making use of special tools as illustrated in Fig. 18. The seal shall be given a “kidney” shape
and shall be free from any edges in its bends.
Fig. 17 Fig. 18
Once the seal has been positioned into the groove, shape it into a ring by hand and by pushing
in the direction of the arrow (see Fig. 17).
Calibrate the seal directly on the rod only if the latter is provided with a lead-in chamfer.
Otherwise, calibrated gauges may also be used, provided they have a specific chamfer (see Fig.
19).
Fig. 19
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Upon bushing installation, be extremely careful not to damage the newly fitted seals in contact
with rod thread. Carry out a rotary movement in order to facilitate the coupling of the rod
guide bushing.
Make the bushing slide along the rod and position it into the head seat. Clamp the front flange
by tightening the screws with suitable torque (see the table Tab. 2 at page 5).
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5.3 Replacement of piston seals
� Configuration with seals, CHEVRON type;
Fig. 20
Tab. 6
Hereunder a list of directives to be observed for a correct replacement of piston seals. Use the
drawing of Fig. 20 as reference.
Pos. No. Description
D 2 O-ring
E 2 Packing seal for piston sealing
F 1 O-ring
G 1 Stop dowel
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Remove the screws that fix the head to the threaded flange of the barrel. Pull off the front
flange, rod guide bushing and head, when they are still assembled, being careful not to
damage the rod. Pull off the rod-piston assembly. Remove the stop Seeger ring, unscrew the
locking dowel of the cushion ring and draw it off. Draw off the pistons and the slewing ring.
Be extremely careful not to damage the seals of the bushing due to possible contact with the
thread at rod end.
After having removed the worn-out seals, carry out a thorough washing of all parts with
accurate examination of the barrel, rod and piston in order to ascertain that no scorings, burrs
or any other kind of damages have been caused to the surface. In case of damage, ask
Stocchetta Cilindri S.r.l. for spare parts in order to provide for the replacement.
If the cylinder is provided with cushioning, check - after having disassembled the rod-piston
unit from the cylinder body – that the cushioning components are not damaged or worn out.
Lubricate the new seals to be fitted and their seats in the bushing by making use of specific
grease type Polymer 400\0 (to be supplied upon request). The specific feature of grease is to
improve the sensitivity, accuracy, tightness and service life of the seals, thus avoiding sticking
and jerky movements (stick-slip effect), besides facilitating the motions at low speeds by
decreasing the frictions.
Check the correct orientation of the seals with respect to the thrust direction of the hydraulic
fluid as illustrated in the following figure (see Fig. 21).
Fig.21
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Fit the new packing seals in the seats resulting from the coupling of front and rear pistons,
and the guide slewing ring. Replace also the sealing O-rings between the pistons and the rod.
Re-assemble the pistons, the slewing ring and the cushion ring. Block the stop dowel of the
spinner, by making use of LOCTITE 270, and the stop Seeger ring. Re-assemble the rod-piston
assembly. Re-assemble the front flange, rod guide bushing and cylinder barrel assembly being
careful not to damage the rod or the seals positioned in the assembled unit. Tighten the
screws that clamp the head to the threaded flange of the barrel. Tighten the screws crosswise
by applying a gradual tightening torque up to the maximum value stated in Table 1 at page 4.
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� Low friction configuration;
Fig. 22
Tab. 7
Hereunder a list of directives to be observed for a correct replacement of piston seals. Use the
drawing of Fig. 22 as reference.
Pos. No. Description
E1 1 GLYD RING seal
E2 3 Guide rings
F 1 O-ring
G 1 Stop dowel
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Remove the screws that clamp the head to the ring nut of the barrel. Pull off the rod guide
bushing and the head when they are still assembled, being careful not to damage the rod. Pull
off the rod-piston unit.
Be extremely careful not to damage the seals of the bushing due to possible contact with the
thread at rod end.
After having removed the worn-out seals, carry out a thorough washing of all parts with
accurate examination of the barrel, rod and piston in order to ascertain that no scorings, burrs
or any other kind of damages have been caused to the surface. In case of damage, ask
Stocchetta Cilindri S.r.l. for spare parts in order to provide for the replacement.
If the cylinder is provided with cushioning, check - after having disassembled the rod-piston
unit from the cylinder body – that the cushioning components are not damaged or worn out.
Lubricate the new seals to be fitted and their seats in the bushing by making use of specific
grease type Polymer 400\0 (to be supplied upon request). The specific feature of grease is to
improve the sensitivity, accuracy, tightness and service life of the seals, thus avoiding sticking
and jerky motions (stick-slip effect), besides facilitating the motions at low speeds by
decreasing the frictions.
Check the correct orientation of the seals with respect to the thrust direction of the hydraulic
fluid as illustrated in the following figure (see Fig. 23).
SEAL RING Fig. 23
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Install the seals of the piston by operating evenly and avoiding any use of metallic, sharp-
edged tools, being extremely careful not to cause any long-term deformation to the seals.
Position the O-ring in its seat by expanding it as much as necessary. Place the sealing ring into
the groove, over the O-ring (see Fig. 24) and enlarge it by hand until it correctly fits (see Fig.
25).
Fig. 24 Fig. 25
The same operation can be carried out by means of a special device consisting of an expansion
cone and an expanding sleeve (see Fig. 26).
Fig. 26
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The seal can be calibrated by making use of the corresponding cylinder barrel, on condition
that it is provided with a suitably long lead-in chamfer, or by means of a calibrating tool (see
Fig. 27).
Fig. 27
Lubricate the cylinder barrel with oil, then insert the rod/piston unit.
Insert the assembled rod-piston unit into the barrel and push until it reaches the end stop.
Reassemble the bushing-head unit and fix it, by making use of suitable screws, to the ring nut
of the barrel. Tighten the screws crosswise by applying a gradual tightening torque up to the
maximum value stated in Table 1 at page 4.
The kits of seals supplied by Stocchetta Cilindri S.r.l. as spare parts shall be stored in
moisture-free areas, avoiding any direct contact with heat sources and the exposure to direct
sunlight.
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5.4 Inductive proximity switches installation and calibration
Fig. 29
Bore 50 63 80 100 125 140* 160 180* 200 250 320 400 500
F 36 36 36 36 36 36 36 36 36 36 36 36 36
PE 130 137 147 150 160 177 296 205 205 240 260 310 370
PY 92,5 107 120 129 153 181 189 205 231 266 316 314 398
PP^ 130 136 156 182 204 208 232 250 258 308 338 373 428
*: Add stroke
^: Not foreseen by Standard ISO
Tab. 10
Move the cylinder to end of stroke, in correspondence with the head and/or bottom where
calibration shall be carried out.
Disconnect pressure supply and discharge the hydraulic fluid filled in the cylinder chambers.
Slightly lubricate the thread and the sealing O-ring of the inductive sensor by making use of
specific grease type Polymer 400\0 (to be supplied upon request).
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Fig. 30
Connector Clamping nut Inductive proximity switch
Screw the inductive sensor clockwise into the ring nut, which is inserted in the heads, until it
reaches the end stop.
Fig. 31
Install the connector (variants and overall dimensions in Fig. 22) by paying attention to the
correct alignment with the reference tongue positioned in the sensor; lock the sensor in place
by making use of the special clamping ring nut.