SL 250 SL 350 Series

Transcription

1 ISO 3320 Hydraulic cylinders SL 250 SL 350 Series Use and maintenance manual APP REV.00 Revisione Data Emissione Modifiche 00 01/01/2015 PRIMA EMISSIONE Stocchetta Cilindri S.r.l. Via Capretti n 14, Brescia Italia

2 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

3 1 Product information 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 Cylinder end cap (or cylinder rear head) The Stocchetta Cilindri SL 250 and SL 350 series of hydraulic double acting cylinders and servocylinders 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 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.

4 1.2 Technical specifications 2 Interchangeability dimensions Nominal operating pressure (non-stop operation) Rod diameters In compliance with ISO 3320 and DIN standards SERIES SL 250: 250 bar (25 MPa) SERIES SL 350: 350 bar (35 MPa) Depending on bore type, 2 diameters are available from 20 mm to 220 mm. Upon customer s request, with dimensional tolerances as follows: Stroke / / / /- 5 Max. standard speed 0.5 m/s Standard temperature Standard hydraulic fluid From -20 C to +100 C Mineral oil. Alternatively, HFC, HFD, HFA Interchangeable dimensions and mounting pieces with: Mounting pieces and accessories 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.

5 1.3 General product description 3 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

6 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. 4 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 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) TIGHTENING TORQUES TABLE FOR SL 350 CYLINDERS Bore 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) 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).

7 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: 5 - DIAMETERS 40 50: threaded and screwed in the cylinder head; - DIAMETERS SMALL ROD: fitted in a precision seat and locked by an easy-to-disassemble front flange (N), bolted to the cylinder head; - DIAMETERS 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* 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) TIGHTENING TORQUES TABLE FOR SL 350 CYLINDERS Bore 63* 80* 100* 125* 140* 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) 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

8 6 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.

9 2 Use of manual 7 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 STC ), handling and storage (see chapters no. 6 and 7 of basic manual STC ), read this manual and basic manual STC carefully. The handbook contains 34 pages. 2.1 Safety symbols DANGER CAUTION NOTICE IMPORTANT Identifies a dangerous situation which, if not avoided, may cause death or serious body injuries. Identifies a dangerous situation which, if not avoided, may cause slight up to medium-serious body injuries Information which, if used, protects the product and/or the environment from material damages. 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.

10 2.2 General information 8 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 STC 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

11 3 Decommissioning 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

12 3.3 Disassembly preliminary operations 10 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 STC shall apply.

13 4 Repair and spare parts 11 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 address: 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 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.

14 5 Maintenance/ replacement of parts subject to wear 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 and lock the nut in position. In case of leakage from the bonded seal, increase the tightening torque.

15 5.2 Replacement of seals of the rod guide bushing 13 Configuration with seals, CHEVRON type; Threaded bushing (diam ) (diam only big-sized rod); Fig.6 Pos. No. Description A 1 Scraper B 1 Seal, CHEVRON type C 1+1 O-ring Backup ring Tab. 3

16 Check that the surface of the rod is free from damages that may affect the service life of the seals. 14 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

17 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. 15

18 Configuration with seals, CHEVRON type; 16 Bolted flange (diam only small-sized rod) (diam. exceeding 140); Fig. 8 Pos. No. Description A 1 Scraper B 1 Seal, CHEVRON type C 1+1 O-ring Backup ring Tab. 4

19 Check that the surface of the rod is free from damages that may affect the service life of the seals. 17 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

20 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). 18

21 Low friction configuration; Threaded bushing (diam ) (diam only big-sized rod); 19 Fig. 10 Pos. No. Description A 1 Scraper B1 2 STEPSEAL gasket B2 1 O-ring C 1+1 O-ring Backup ring Tab. 5

22 Check that the surface of the rod is free from damages that may affect the service life of the seals. 20 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

23 Install the seals in the bushing by operating evenly and avoiding any use of metallic, sharpedged tools, being extremely careful not to cause any long-term deformation to the seals. 21 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

24 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. 22 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.

25 Low friction configuration; 23 Bolted bushing (diam only small-sized rod) (diameters exceeding 140); Fig. 15 Pos. No. Description A 1 Scraper B1 2 STEPSEAL gaskets B2 1 O-ring C 1+1 O-ring Backup ring Tab. 6

26 Check that the surface of the rod is free from damages that may affect the service life of the seals. 24 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

27 Install the seals in the bushing by operating evenly and avoiding any use of metallic, sharpedged tools, being extremely careful not to cause any long-term deformation to the seals. 25 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

28 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. 26 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).

29 5.3 Replacement of piston seals 27 Configuration with seals, CHEVRON type; Fig. 20 Pos. No. Description D 2 O-ring E 2 Packing seal for piston sealing F 1 O-ring G 1 Stop dowel 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.

30 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. 28 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

31 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. 29

32 Low friction configuration; 30 Fig. 22 Pos. No. Description E1 1 GLYD RING seal E2 3 Guide rings F 1 O-ring G 1 Stop dowel 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.

33 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. 31 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

34 Install the seals of the piston by operating evenly and avoiding any use of metallic, sharpedged tools, being extremely careful not to cause any long-term deformation to the seals. 32 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

35 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). 33 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.

36 5.4 Inductive proximity switches installation and calibration 34 Fig. 29 Bore * * F PE PY 92, PP^ *: 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).

37 35 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.