Metso Neles N1 Series User manual

6 N1 70 en • 7/2019
NELES® HIGH PERFORMANCE HEAVY
DUTY SCOTCH YOKE ACTUATOR,
SERIES N1
Installation, Maintenance and
Operating Instructions

26 N1 70 en
Table of Contents
1 GENERAL .............................................................. 3
1.1 Scope of the manual ........................................... 3
1.2 Structure and operation .................................... 3
1.3 Actuator markings ............................................... 3
1.4 Specifications ......................................................... 4
1.5 Recycling and disposal ....................................... 4
1.6 Definitions ............................................................... 4
1.7 Safety precautions ............................................... 5
2 TRANSPORTATION AND STORAGE .................... 5
3 MOUNTING AND DEMOUNTING ........................ 6
3.1 Actuator gas supply ............................................ 6
3.2 Installation information ..................................... 6
3.3 Mounting the actuator on the valve ............. 6
3.4 Operating directions........................................... 6
4 MAINTENANCE .................................................... 7
4.1 Maintenance general.......................................... 7
4.2 Maintenance precautions of the N1_E_C
and N1_E_A actuator .......................................... 9
4.3 Module removal and installation ................... 9
4.4 Actuator Disassembly .......................................14
4.5 Actuator Reassembly ........................................19
4.6 Stroke screw adjustment .................................23
4.7 Field conversions ...............................................23
5 MALFUNCTIONS ................................................ 23
6 TOOLS ................................................................24
6.1 Tightening torque table ..................................24
7 ORDERING SPARE PARTS ..................................24
8 EXPLODED VIEWS AND PARTS LIST ................ 25
8.1 Double acting actuators N1_D00 2 ................ 5
8.2 Single acting actuators N1_E_C and
N1_E_A ...................................................................27
9 DIMENSIONS AND WEIGHTS ............................29
9.1 Dimensions double acting.............................. 29
9.2 Weights double acting .....................................30
9.3 Dimensions single acting ................................31
9.4 Weights single acting .......................................32
9.5 Attachment dimensions ..................................33
10 TYPE CODE .........................................................34
READ THESE INSTRUCTIONS FIRST!
These instructions provide information about safe handling and operation of the device.
If you require additional assistance, please contact the manufacturer or manufacturer’s representative.
Addresses and phone numbers are printed on the back cover.
See also www.metso.com/valves for the latest documentation.
SAVE THESE INSTRUCTIONS!

6 N1 70 en 3
1 GENERAL
1.1 Scope of the manual
This instruction manual contains important information
regarding the installation, operation and maintenance of
Metso N1 series actuators. Please read these instructions
carefully and save them for future reference.
The manual can be changed or revised without any prior
notice. Any changes in product’s specification, structure,
and/or any components may not result immediate revised
version of the manual.
1.2 Structure and operation
The N1 series actuators are pneumatic quarter turn cylinder
actuators designed for control and shut-off service. Design
is modular and enables an ideal configuration of pneu-
matic, central block and spring modules. Ductile cast iron
center body, fabricated carbon steel pneumatic module
and spring module provides rugged actuator construction.
The spring provides the required safety function; the valve
either opens or closes if the air supply is interrupted.
The mounting face dimensions of the N1 actuator comply
with the ISO 5211 standard.
The N1_E_C is spring to close type actuator. The yoke of the
actuator, when operated by the spring, rotates clockwise as
seen from the pointer cover side. The piston then moves
towards the frame side of the cylinder. The two keyways in
the yoke are positioned at an angle of 90° to each other,
making it possible to change the position of the actuator in
relation to the valve, see Fig. 1.
Fig. 1 Operating principle of the N1_E_C actuator
The N1_E_A is spring to open type actuator. The yoke of the
actuator, operated by the spring, rotates counter clockwise
as seen from the pointer cover side. The piston then moves
towards the frame side of the cylinder. The two keyways in
the secondary shaft (yoke) are positioned at an angle of 90°
to each other, making it possible to change the position of
the actuator in relation to the valve, see Fig. 2.
Fig. 2 Operating principle of the N1_E_A actuator.
The N1_D is a double acting actuator. The linkage mecha-
nism converts linear motion (provided by an air supply and
piston) to rotary motion. The yoke of the actuator rotates
clockwise (close) when cylinder supply is in rear port and
counter clockwise (open) when cylinder supply is in front
port, see Fig. 3.
Fig. 3 Operating principle of the N1_D actuator.
1.3 Actuator markings
The actuator is provided with an identification plate, see
Fig. 4.
Fig. 4 ID plate
Identification plate markings are:
1. Type
2. Manufacturing site, date, successive no. (bar code)
3. SO number or ID number (bar code)
4. Max. operating pressure
5. ATEX category and protection level
(1)
(2)
(3)
(4)
(5)

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1.4 Specifications
Protection class: IP66, IP67
Ambient temperatures:
Standard design -20° to 80 °C / -4° to 176 °F
Maximum Supply pressure: Depends on model, See Table 3
Table 1 Stroke volume, dm3- Single acting
Table 2 Stroke volume, dm3- Double acting
Note: Actuator output torques - consult factory.
Table 3 Maximum operating pressure
Note: Actuator output torques - consult factory.
1.5 Recycling and disposal
Most of the actuator parts can be recycled if sorted accord-
ing to material. Most parts have material marking. A mate-
rial list is supplied with the actuator. In addition, separate
recycling and disposal instructions are available from the
manufacturer. An actuator can also be returned to the man-
ufacturer for recycling and disposal against a fee.
1.6 Definitions
The following definitions given here are used in this docu-
ment:
Cyl. Diam 63 80 100 125 150 200 250 300 350 400 500 600 700 800 900 1000 1100 1200 1300
Actuator Stroke volume, dm3
N1X0.30.60.91.4---------------
N1A --0.91.42.53.65.78.211----------
N1B -------101418---------
N1C -------12172235--------
N1D -------142027426394------
N1E ---------325076113137171----
N1G ----------6293417168202----
N1H -----------115213208261305---
Cyl. Diam 63 80 100 125 150 200 250 300 350 400 500 600 700 800 900 1000 1100 1200 1300
Actuator Stroke volume, dm3
N1X0.71.11.82.7---------------
N1A --1.82.84.17.311.416.422.5----------
N1B -------192735---------
N1C -------24324266--------
N1D -------27395079119177------
N1E ---------6195143213258324----
N1G ----------116176262317382----
N1H -----------218324392493577---
Cyl. Diam 63 80 100 125 150 200 250 300 350 400 500 600 700 800 900 1000
Actuator maximum operating pressure, barg
N1X8.08.08.08.0------------
N1A--8.08.08.08.08.08.06.0-------
N1B-------8.07.76.0------
N1C-------8.08.08.06.0-----
N1D-------8.08.08.06.05.55.5---
N1E---------8.06.05.55.55.55.5-
N1G----------6.05.55.55.55.5-
N1H-----------5.55.55.55.55.5
WARNING:
If not observed, user incurs a high risk of
severe damage to the product and/or fatal
injury to personnel.
CAUTION:
If not observed, user may incur damage to the product
and/or injury to personnel.

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1.7 Safety precautions WARNING:
Valve on which actuator is installed should be earthed
properly to discharge static charge.
2 TRANSPORTATION AND STORAGE
Make sure that the actuator and associated equipment
have not been damaged during transportation. Store the
actuator carefully before installation, preferably indoors in a
dry place. Do not take it to the installation site or remove
the protective caps of ports for piping until just before
installation.
Lift the actuator as shown in Fig. 5: in a horizontal position
from the lifting lugs. Refer to Section 9 for weights..
Fig. 5 Lifting the actuator
Upon receiving the product check the limit actuator and
the accompanying devices for any damage that may have
occurred during transport.
Store the actuator carefully. Storage indoors in a cool, dry
place. Temperature limit for the storing is from 4 °C to 40 °C.
The actuator should be left in its original packing until it is
required for the use. Do not remove protective plugs until
installing the actuator.
NOTE:
Advisory and information comments provided to assist
maintenance personnel to carry out maintenance proce-
dures.
WARNING FOR ATEX:
If not observed, user incurs a high risk of severe dam-
age to actuator and/or fatal injury to personnel.
CAUTION:
Don’t exceed the permitted values!
Exceeding the permitted pressure value marked on the
actuator may cause damage and lead to uncontrolled
pressure release in the worst case. Damage to the equip-
ment and personal injury may result.
CAUTION:
Don’t dismantle a pressurized actuator!
Dismantling a pressurized actuator leads to uncontrolled
pressure release. Shut off the supply pressure and release
pressure from the cylinder before dismantling the actua-
tor. Otherwise, personal injury and damage to equipment
may result.
CAUTION:
Follow the instructions given on the actuator warning
plates!
CAUTION:
Before opening the cylinder fastening screws (11),
release spring tension directed on actuator warning
plate and in these instructions!
CAUTION:
Don’t dismantle the spring module!
Do not remove the spring module while the spring is com-
pressed or under pressure.
CAUTION:
Take the weight of the actuator or valve combination
into account when handling it!
Lifting lugs on the actuator are meant only for lifting
actuator and not complete valve assembly.
Do not lift the valve combination from the actuator, posi-
tioner, limit switch or their piping. Lift the actuator as
directed in Section 2, lifting ropes for a valve combination
should be fastened around it. The weights are shown in
Section 9. Dropping may result in personal injury or dam-
age to the equipment.
WARNING FOR ATEX:
While lifting actuator housing should not
impact on the other light or rusty metal .
CAUTION:
Potential electrostatic charging hazard, do not rub
surface with dry cloth.
WARNING FOR ATEX:
Inspect for paint damaged, to ensure contin-
ued corrosion protection.
Actuator speed should not faster than speci-
fied in the following chart.
MODEL STROKE
(mm)
MINIMUM
OPENING/CLOSING
TIME (SECONDS)
N1X 56 0.1
N1A 116 0.1
N1B 150 0.2
N1C 180 0.2
N1D 216 0.3
N1E 260 0.3
N1G 320 0.4
N1H 396 0.5
WARNING:
DO NOT USE THE DEVICE IF IT IS DAMAGED
DURING TRANSPORTATION!
IF THE DEVICE HAS SUFFERED DAMAGE DUR-
ING TRANSPORTATION DO NOT INSTALL AND USE IT.
IN CASE OF NOTICING DAMAGE TO THE DEVICE UPON
RECEIVING IT PLEASE CONTACT THE SUPPLIER.

66 N1 70 en
3 MOUNTING AND DEMOUNTING
3.1 Actuator gas supply
Dry compressed air, nitrogen or natural gas (sweet) can be
used as supply medium, no oil spraying is needed. The air
supply connections are presented in the dimensional draw-
ings in Chapter 9. The maximum supply pressure is depend-
ing the selected model.
3.2 Installation information
Before installation please take care of the safety precau-
tions mentioned in the Section 1.7.
Ensure that the actuator will not be exposed to pressure in
excess to the maximum rating as indicated on the actuator
nameplate or technical documents.
Ensure that throughout the installation that there are no
leaks of the supply media.
The maximum operating temperature for the actuator
depends on individual build of actuator. Refer nameplate
for operating temperature range.
Ensure that the maximum operating temperature as indi-
cated on the nameplate is not exceeded during operation,
transportation or storage of the actuator.
The environment and surrounding should not affect or limit
the operational safety of the product.
Ensure the product is protected against impact, vibration or
any kind of movement during operation, transportation
and storage.
Product should not be installed in hazardous area that is
not compatible with the gas group and temperate class
indicated on the nameplate.
N1 series actuators can be mounted on valve in any desired
position. However it is recommended to align the center-
line of the pneumatic cylinder module along the pipeline.
Ensure proper tightening of fasteners and mounting acces-
sories to avoid loosening during operation.
All the tubing, fitting and actuation media should be free
from contamination and filtered to the desired level. Qual-
ity of media should be as per ISO 8573-1 [5:3:4]. For addi-
tional information consult Metso.
Ensure proper adjustments of the stopper bolt to desired
opening and closing of the valve.
Once proper installation is done, check for smooth continu-
ous operation. If undesired operation occurs, check for cor-
rect pressure and volume flow.
3.3 Mounting the actuator on the valve
Install the actuator so that the shaft of the valve or any
other device to be actuated goes into the shaft bore of the
actuator. If the bore is larger than the shaft diameter, use a
keyed shaft adapter, sleeve or bushing. There are two key
way slots in the shaft bore of the actuator at an angle of 90°.
These allow the installation position of the actuator to be
changed in relation to the valve. Metso valves have a bevel
at the end of their shafts to facilitate installation.
Fig. 6 Ways to install the actuator
The installation position can be selected freely, but Metso
recommends installation of spring return version with the
pneumatic cylinder pointing towards the ground. Double
acting version can be installed any position. The actuator is
thus best protected against damage due to supply air
impurities or water. When the installation position of the
actuator is altered, the arrow indicating the operating direc-
tion must be turned to correspond with the actual opera-
tion of the valve.
When necessary, lubricate the actuator bore and collar with
grease or anti-corrosive agent to prevent it from jamming
due to rust.
The actuator must not be allowed to come in contact with
the pipework, because the vibrations may damage it or
cause unsatisfactory operation.
In some cases, e.g. when using large actuators or with
extensive pipework vibrations, the actuator should be sup-
ported. Consult Metso for instructions.
If the actuator is used with devices other than Metso valves,
any additional parts attached to the actuator must be prop-
erly protected.
3.4 Operating directions
A sticker on the actuator cylinder indicates the spring
action direction.
NOTE:
Flow may be restricted by undersize tubing or fitting.
These may throttle the flow resulting in reduce pressure or
volume causing intermittent or undesired movement.
CAUTION:
Be aware of the cutting movement of the valve!
NOTE:
Separate instructions are available for adjusting the close
limit of metal-seated butterly valves. Refer to the installa-
tion, operating and maintenance instructions of the valve.

6 N1 70 en 7
3.4.1 N1_E_C actuator spring -to-close
direction
Install the actuator on the valve with the spring return position
(fail safe) and the valve in the closed position, see Fig. 5. The
cylinder must be de-pressurized and the air ports open. Adjust
the closed-position setting using the stop screw (42a) on
center block. The open-position setting is adjusted with stop
screw (42b) on the center block while the actuator is pressur-
ized and the piston is at the rear end of the cylinder.
Fig. 7 N1_E_C actuator
3.4.2 N1_E_A actuator spring -to-open
direction
Install the actuator on the valve with the spring return position
(fail safe) and the valve in the open position, see Fig. 6. The cyl-
inder must be de-pressurized and the air ports open. Adjust
the open-position setting using the stop screw (42b) on center
block. The closed-position setting is adjusted with stop screw
(42a) on the center block while the actuator is pressurized and
the piston is at the rear end of the cylinder..
Fig. 8 N1_E_A actuator
3.4.3 Demounting the actuator from the
valve
The actuator must be de-pressurized and the supply air dis-
connected. Unscrew the actuator-side screws of
the bracket and pull the actuator off the valve shaft. This is
best done lifting the actuator from lifting lugs by crane.
Note the mutual positioning of the valve and the actuator
to ensure correct functioning after reassembly.
4 MAINTENANCE
4.1 Maintenance general
Although Metso’s Neles actuators are designed to work
under severe conditions, proper preventative maintenance
Can significantly help to prevent unplanned downtime and
in real terms reduce the total cost of ownership. Metso rec-
ommends inspecting the actuators at least every five (5)
years. The inspection and maintenance interval depend on
the actual application and process condition. The inspec-
tion and maintenance intervals can be specified together
with your local Metso experts.
During this periodic inspection the parts detailed in the
Spare Part Set should be replaced. Time in storage should
be included in the inspection interval.
If maintenance assistance is required, please contact your
local Metso office. The part numbers in parentheses () in the
text refer to the exploded view and to the parts list in Sec-
tion 8, unless otherwise stated.
This procedure is applicable with the understanding that all
pneumatic pressure has been removed from the actuator.
Remove all piping and mounted accessories that will inter-
fere with the module that are to be worked on.
When removing seals from seal grooves; use a commercial
seal removing tool or a small screwdriver with sharp corners
rounded off.
Use a non-hardening thread sealant on all pipe threads.
All parts should be thoroughly inspected for excessive wear,
stress cracking and pitting. Attention should be directed to
threads, sealing surfaces and areas that will subjected to
sliding and rotating motion.
Actuator parts that reflect any of the above listed character-
istics should be replaced with new parts.
Metso recommends that disassembly of the actuator mod-
ules should be done in a clean area on a workbench.
After reassembly, the actuator needs to be stroke for several
times to ensure the desired function and safety.
If you remove the stop screw, adjust the limits after lubrica-
tion or grease filling!
Before doing maintenance, check actuator for leakage at
inlet, outlet and cover.
CAUTION:
Depressurise the actuator before starting demount-
ing!
CAUTION:
Observe the safety precautions mentioned in Section
1.7 before maintenance!
CAUTION:
Apply the thread sealant as per the manufacturer’s
instructions.

86 N1 70 en
For single acting actuator if port B is connected then check air leakage from exhaust port.
For double acting actuator if port B is connected then check air leakage from exhaust port.
NOTE:
In order to ensure safe and effective operation, always use
original spare parts to make sure that the actuator func-
tions as intended.
NOTE:
When sending goods to the manufacturer for repair, do
not disassemble them.
NOTE:
For safety reasons, replace bolting if the threads are dam-
aged, have been heated, stretched or corroded.

6 N1 70 en 9
4.2 Maintenance precautions of the
N1_E_C and N1_E_A actuator
The spring module has a warning sticker. When servicing
the unit, check that the sticker is in place and legible. See
Fig. 8. Also check that the spring module has the arrow
sticker indicating the spring operating direction.
Fig. 9 Warning plate of the N1_E_C and N1_E_A actuator
4.3 Module removal and installation
4.3.1 Spring module removal
Step 1. Apply pneumatic pressure to front cover (3) to com-
press the spring enough to move the yoke off the stop
screw of spring module side of the central block module.
Step 2. Loosen the stop screw nut (43) located on the stop
screw that is closest to or next to Spring Module.
Step 3. Unscrew stop screw (42) that is closest to or next to
Spring Module (unscrew or back out until the load is
removed from the stop screw).
Step 4. Remove pneumatic pressure from pressure inlet
port of front cover (3).
Step 5. Spring cartridge preload must be removed before
spring module is removed from actuator assembly. To remove
spring cartridge preload Apply pneumatic pressure to rear
cover (10) to move the spring cartridge connecting rod (58).
Step 6. Unscrew bolts (44) of rear side end cap (61) and
remove end cap.
Step 7. Unscrew lock nut (53) of connecting rod (58) to
remove lock nut.
CAUTION:
Don’t dismantle a pressurized actuator!
CAUTION:
To release spring tension, the spring direction stop
screw at the central block must be removed before the
cylinder fastening screws are opened!
CAUTION:
Don’t dismantle the spring package!
The spring package within the cylinder is preloaded.
Never open or dismantle the spring package. The spring
module is always delivered as a pre-assembled package.
WARNING:
Do not remove spring module while spring is
compressed
NOTE:
Review section 4.4.1 General Disassembly before pro-
ceeding with spring module disassembly. The setting of
stop screws should be checked and setting recorded
before stop screws are loosened or removed.
CAUTION:
Due to the weight and size of spring cartridge assem-
bly, heavy duty support equipment will be required
when removing module from actuator assembly.
CAUTION:
Maximum pressure to be applied in the above step is 1 barg
(1 kg/cm2).
NOTE: If pneumatic pressure is not available to apply, use
special Metso spanner for ring nut.

10 6 N1 70 en
Step 8. Remove hex cap screw /nut (38) with lock washer (37) from housing.
Step 9. Remove spring module from actuator assembly, use
lugs provided on spring module assembly for lifting.
Step 10. Un-screw and remove hex. Soc. Head cap screw
(45) from top cover (12) of central block module.
Step 11. Fitment between top cover (12) and central block
(11) is tight, use screw driver as crowbar and put it in slot
provided on central block cover to lift the cover.
Step 12. Unscrew connecting nut (44) to dismantle con-
necting rod (58) from carrier (15).
WARNING:
Under no circumstances should the spring module
assembly be cut apart, as the spring is preloaded
and spring cartridge is welded assembly.
CAUTION:
Do not damage O-ring or O-ring grove while removing
top cover (12).

6 N1 70 en 11
4.3.2 Spring Module Installation Step 1. To replace existing spring module first remove
existing spring module from actuator refer chapter 4.3 sec-
tion 4.3.1 spring module removal. Skip procedure steps
from 2 to 4 for single acting.
Step 2. For double acting actuator before starting spring
module installation procedure actuator must be at over
travel position. To over travel the actuator unscrew the
stroke adjustment screw (42) refer Chapter 4.3 section 4.3.1
from step 2 to 3.
Step 3. Remove hex cap screw/nut (38) with lock washer (37) from housing to remove rear cap.
Step 4. Remove rear cap from central block housing.
Step 5. Align connecting rod (58), connecting nut (44) and
connecting bolt (55) assembly with carrier (15) and screw it
in carrier (15). Across flat on connecting bolt should be
locate inside the across flat of carrier.
Step 6. Align guide bush (60) with connecting rod and cen-
tral block
Step 7. Align spring assembly with actuator assembly and
install o-ring seal (24) at front face of spring assembly and
also install o-ring (33) at the guide rod (14).
NOTE:
Review section 4.4.1 General Disassembly before proceed-
ing with spring module disassembly.
This procedure is required to convert double acting actua-
tor to single acting spring return actuator or to replace
existing spring module assembly.
NOTE:
When removing rear cap from actuator assembly, be care-
ful to lose o-ring seals.
NOTE:
Clean the connecting rod and apply grease before
installation.
NOTE:
Apply grease inside diameter of bearing bush (60)

12 6 N1 70 en
Step 8. Install hex. Cap screw / stud thru housing in spring module and tighten to assembly the spring module with actuator.
Step 9. Using special Metso spanners go thru the open end
of spring module and rotate the spanner until the initial
thread engagement of the lock nut (53) with connecting
rod (58) is achieved.
Step 10. Install o-ring seal (63) into the o-ring groove in the
outboard end of spring module and then install rear cap (61).
4.3.3 Pneumatic Cylinder Module Removal
Step 1. Apply pneumatic pressure to front cover (3) to
rotate actuator by 45 degree.
Step 2. Unscrew connecting nut (44) to dismantle piston
rod (9) from carrier (15)
Step 3. Remove 6 hex cap screw/nut (38) pneumatic cylinder assembly sides with lock washer (37) from central block housing (11).
Step 4. Remove pneumatic cylinder module from actuator
assembly.
CAUTION:
Spring module should be removed before starting pneu-
matic cylinder module removal procedure.
CAUTION:
Maximum pressure to be applied in the above step is 1
barg (1 kg/cm2).
NOTE:
When removing cylinder module from actuator assembly,
be careful to lose o-ring seals.

6 N1 70 en 13
4.3.4 Pneumatic Cylinder Module Installation
Step 1. Check to verify that o-ring seals (24), (33) are prop-
erly fitted in its seal grove on the front cover (3) and guide
rod (14) respectively.
Step 2. Using lifting equipment move the pneumatic cylin-
der module up to central block module and align the piston
rod to the centre of central block housing (11).
Step 3. Align piston rod (9), connecting nut (44) and con-
necting bolt (20) assembly with carrier (15) and screw it in
carrier (15).
Step 4. Install hex cap screw / nut with spring washer to install pneumatic module on central block module.

14 6 N1 70 en
4.4 Actuator Disassembly
4.4.1 General Disassembly
Actuator disassembly is written to either completely disas-
semble the entire actuator or can be used to disassemble
individual Units as needed (pneumatic cylinder or spring
cartridge).
When the spring cartridge unit is to be removed it should
be removed from the central block unit prior to the Pneu-
matic cylinder unit removal or disassembly. Then rotate
actuator by 45 degree for Pneumatic cylinder assembly
removal or disassembly.
To ensure correct reassembly, mark or tag mating surfaces.
Actuator central block base should be rigidly mounted
before disassembly of any component.
4.4.2 Pneumatic cylinder module
disassembly
Step 1. Unscrew and remove hex. Soc. Head cap screw (45)
from top cover (12) of central block module.
Step 2. Fitment between top cover (12) and central block
(11) is tight, use screw driver as crowbar and put it in slot
provided on central block cover to lift the cover.
Step 3. Apply pneumatic pressure to front cover (3) to
rotate actuator by 45 degree.
Step 4. Unscrew connecting nut (44) to dismantle piston
rod (9) from carrier (15).
Step 5. Remove two tie rod (8) hex nut (40) with spring
washer (39) from outboard side of rear cover (10).
WARNING:
It is possible, that the actuator may contain a
dangerous gas and/or liquids. Ensure that all
proper measures have been taken to prevent
exposure or release of these types of contaminants
before commencing any work.
NOTE:
Review section 4.4.1 General Disassembly before proceed-
ing with pneumatic cylinder module disassembly
If the actuator model is a N1_S2_D00D_ (two same size
pneumatic cylinder units with one unit mounted on each
side of the central block unit) then do the following steps
on both pneumatic cylinder Units simultaneously or com-
plete one pneumatic cylinder unit and then repeat section
4.3.2 on the second pneumatic cylinder unit.
WARNING:
If not already removed disconnect all operating
pressure from actuator pneumatic cylinder.
CAUTION:
Do not damage O-ring or O-ring grove while removing
top cover (12).
CAUTION:
Spring module should be removed before starting pneu-
matic cylinder module removal procedure.
CAUTION:
Maximum pressure to be applied in the above step is 1
barg (1 kg/cm2).

6 N1 70 en 15
Step 6. The fit between cylinder tube (4) and rear cover (10)
is very tight. Use screwdriver as crowbar to remove rear
cover (10) from cylinder tube (4), remove rear cover from
cylinder tube.
Step 7. When removing cylinder tube (4) off of piston (6),
tilt respect to actuator centerline, remove cylinder tube
from piston (6) and front cover (3).
Step 8. Unscrew hex. soc. Head cap screw and remove it
from piston (6) and piston rod (9).
Step 9. Remove piston assembly (6) from tie rod.
Step 10. Remove retaining ring (50) of guide bushing to
remove guide bushing.
Step 11. Remove guide bushing (7) from opposite side of
piston.
Step 12. Remove tie rod (8) from front cover. To remove tie rod
use two lock nuts assemble them on tie rod and tight them
with each other then turn one lock nut to remove tie rod.
CAUTION:
Do not damage o-ring grove when removing rear cover
from cylinder tube.
NOTE:
Use cover taping hole for lifting.
CAUTION:
No not damage seals of guide bushing (7) while removing
piston assembly (6).
NOTE:
Use piston taping hole for lifting.

16 6 N1 70 en
Step 13. Remove 6 hex cap screw/nut (38) pneumatic cylinder assembly sides with lock washer (37) from central block
housing (11).
Step 14. Remove front cover (3) from actuator assembly
with piston rod (9).
Step 15. Remove piston rod (9) and connecting nut (44)
assembly from front side of the front cover (3).
Step 16. Remove retaining ring (36) to remove bearing
bush (5).
Step 17. Remove guide bush (5) from front cover (3).
CAUTION:
Do not damage seals of bearing bush (5) while removing it

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4.4.3 Central block module disassembly
Step 1. Unscrew and remove hex. Soc. Head cap screw (47) from yoke inserts (19) and remove yoke insert (19) from yoke (13).
Step 2. Remove yoke top bearing (46) from yoke (13).
Step 3. Remove guide rod (14) from central block housing
(11).
Step 4. Remove yoke (13) with carrier assembly (15) from
central block housing.
Step 5. Put the yoke assembly on clean and dry place and
remove top retaining ring (49) from yoke pin (16)
CAUTION:
Spring module and pneumatic cylinder module should be
removed before starting central block module removal
procedure.
(Review chapter 4.3 section 4.3.1 and 4.3.2).
The setting of stroke adjustment screw (42) should be
checked and recorded before stroke adjustment screw are
loosen or removed.
NOTE:
Stroke adjustment screw will be removed later in this pro-
cedure.
NOTE:
This procedure considers top cover (12) was removed
while disassemble the pneumatic cylinder module and
spring module.
NOTE:
Taping provided on guide rod to pull out the guide rod
from central block housing.
When removing guide rod from actuator assembly, be
careful to lose o-ring seals.

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Ste 6. Remove top roller (17) with yoke pin washer (16)
from yoke (13) and yoke pin (16).
Step 7. Hold the yoke pin by hand and unscrew hex. Soc.
Head set screw (51) from carrier (15) to remove yoke pin
(16) from carrier.
Step 8. Remove yoke pin (16) from bottom side of carrier
(15) and then remove carrier (15) from yoke (13).
Step 9. Remove bottom side bearing (46) of yoke (13) from
central block housing (11).
Step 10. Unscrew and remove two stroke adjustment screw
nuts (43) from stroke adjustment screw (42).
Step 11. Unscrew and remove two stroke adjustment
screws (42) from housing (11).

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4.5 Actuator Reassembly
4.5.1 General reassembly
Remove and discard all old seals and gaskets.
Parts should be cleaned to remove all dirt and other foreign
material prior to inspection.
Parts should be thoroughly inspected for excessive wear,
stress cracking, galling and pitting. Attention should be
directed to threads, sealing surfaces and areas that will be
subjected to sliding or rotating motion. Sealing surfaces of
the cylinder, tie bars and piston rod must be free of deep
scratches, pitting, corrosion and blistering or flaking coating.
Before installation apply film of lubricant on all moving
parts. Apply film of lubricant on all seals before installing
into seal grooves.
For Spring Module Installation refer chapter 4.3 section
4.3.2.
4.5.2 Central block module reassembly
Step 1. Install bottom yoke bearing (46) in central block
housing (11). Apply grease on bearing seat on central block
housing for ease of assembly.
Step 2. Install carrier (15) in yoke (13) then insert yoke pin
assembly (16) with roller (17) and washer (18) from bottom
side for carrier.
Step 3. Install hex. Head cap screw in carrier to locate the
yoke pin at the center of carrier.
Step 4. Install top side roller (17), washer (18) and retaining
ring (49) on yoke pin (16).
CAUTION:
Only new seals, which are still within the seal’s expectant
shelf life, should be installed into the actuator being refur-
bished.
CAUTION:
Actuator parts that reflect any of the above listed charac-
teristics should be replaced with new parts.
NOTE:
Parts and seals used in the actuator will be assembled
using lubricant as identified in unit 1 section 1.8.
NOTE:
Review unit 4.5 - section 4.5.1 General Re-assembly before
proceeding with central block Module reassembly.
NOTE:
Lubricate yoke pin (16), roller (17) and carrier (15).

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Step 5. Install the yoke assembly in the bottom bearing (46)
of actuator with bottom side o-ring seal (28)
Step 6. Install top bearing (46) on yoke apply grease layer
on bearing.
Step 7. Install yoke insert (19) with o-ring (27) on the top of
yoke with the help of hex. head cap screw (47), apply grease
on top side for yoke insert.
Step 8. Install guide rod (14) in central block housing (11)
and carrier (15).
Step 9. Install top cover (12) with o-ring (25) on central
block housing (11) with the help of hex.soc. head cap screw
(45) apply coat of lubricant on o-ring, and meting surfaces
before installation.
NOTE:
Above step should be done after installation of pneumatic
cylinder module and spring module