SMC Networks LEF Series User manual

Product Name
Electric Actuator / Slider Type
Model / Series / Product Number
LEF
LEFS/LEFB Series
Doc.No. LEF-MM01601-A
LEFS Series
(Ball screw type)
LEFB Series
(Belt drive)
Maintenance Manual
Products after parts replacement by the user are
outside of warranty.

Track changes
Rev.
symbol
Date of
change
Details of the changes
Approved
by
Person in
charge
Remarks
- 2016/03/23 First edition T.Sugiyama
2016/03/23 H.Shiomi 2016/03/23
A 2016/06/16 Addition of grease part number. T.Sugiyama
2016/06/20 T.Nakazawa 2016/06/16

- 1 -
Contents
1. Maintenance Precautions .................................................. - 2 -
2. Mounting and removal of the dust seal band and seal band stopper
assembly............................................................................. - 3 -
3. Applying additional grease on the guide.......................... - 4 -
4. Replenishment of grease for the ball screw..................... - 5 -
5. LEFB Belt Tension Adjustment ......................................... - 5 -
6. Mounting/ removal of the motor and peripheral equipments
(Ball screw type)..................................................................... - 7 -
7. Mounting/ removal of the motor and peripheral equipments (Belt type)
- 15 -
8. Mounting/ removal of the Belt (Belt type)......................... - 19 -
9. Mounting/ removal of the hub (pulley) at the motor side - 23 -
10.Mounting/ removal of the Housing................................... - 25 -

- 2 -
1. Maintenance Precautions
Warning
1) Remove the workpiece and disconnect the power supply during maintenance and replacement
of the product.
[Maintenance frequency]
Preform maintenance according to the table below. if there are any problems, please contact SMC.
Inspection frequency
Appearance check
Internal check
Belt check
Inspect daily before operating
Good
-
-
* Every 6 months or every 1000km
or every 5,000,000 cycles
Good Good Good
* Either of inspection early time is selected.
[Items for visual appearance check]
1. Loose set screws, abnormal/excessive dirt
2. Scratches, cable joint
3. Vibration, noise
[ Internal check item ]
1.Lubricant condition and dirt on moving parts.
For lubrication, use lithium grease No. 2. (Refer to table 3-1.)
2.Loose or mechanical play in fixed parts or fixing screws.
[Items for belt check]
Stop operation immediately when the belt appears to be like malfunction shown in the pictures below.
If it occurs in the first stage of use, confirm it is within the range of the product specification, the
system requirements and conditions of use.
Return the actuator to SMC for the belt to be replaced. （When replacing the belt, please contact
SMC for the instruction manual. Adjustment of the motor origin and adjustment of the belt tension etc.
is difficult. Therefore we recommend returning the actuator to SMC for the belt to be replaced.)
a. Tooth shape canvas is worn out
Canvas fiber becomes fuzzy. Rubber is removed and the fiber becomes whitish. Lines of fibers
become unclear.
b. Peeling off or wearing of the side of the belt
Belt corner becomes round and frayed thread sticks out.
c. Belt partially cut
Belt is partially cut. Foreign matter caught in teeth other than cut part causes flaw.
d. Vertical line of belt teeth
Flaw which is made when the belt runs on the flange.
e. Rubber back of the belt is softened and sticky
f. Crack on the back of the belt

- 3 -
2.) If no locking adhesive is applied to the bolts or screws, take a countermeasure against
loosening.
3) Refer to the spare parts list in the separate sheet for the part numbers and details of the
spare parts.
Japanese version: LEF-MM01101, LEF-MM01201
English version: LEF-MM01301, LEF-MM01401
4). It is recommended replacing the motor as a motor assembly.
2. Mounting and removal of the dust seal band and seal band stopper assembly
2-1. Loosen the retaining screws for the band stopper.
Size Screw type Screw size
Tightening torque
+/- 10% [Nm]
Qty.
16
Round head combination
screw
M2.5x5
0.36
4
25
M3x6
0.63
32
M3x6
40
M3x6
2-2. Remove the seal band stopper at the opposite side of the motor, and pull out the
blanking plate.
Size Screw type Screw size
Tightening torque
+/- 10% [Nm]
Qty.
16
Cross recessed round
head screw
M2.5x16
0.36
2
25
M3x20
0.63
32
M4x30
0.76
40
M4x35
Applicable model: LEFS/LEFB
Opposite side of the motor
Motor side
Band stopper
Table.2-1 Band stopper fixing screws
Fig.2-1 Seal band stopper assembly
Seal band stopper
Table.2-2 Seal band stopper fixining screws
Retaining screws for the
band stopper
Blanking plate
Cross recessed round
head screw

- 4 -
2-3. Pull out the dust seal band to the opposite side of the motor.
2-4. To put the dust seal band back, mount the dust seal band in reversed order of 2-1 to 2-3.
For the replacement of the dust seal band and seal band stopper assembly, order
replacement parts referring to the spare parts list in the attachment.
3. Applying additional grease on the guide.
3-1. Remove the dust seal band. ( Refer to Chapter 2 Mounting and removal of the dust
seal band and seal band stopper assembly)
3-2. Apply grease to the entire guide groove using a spatula (Fig. 3-1).
Slowly slide the table by hand so that the grease is applied to the inside of the guide.
Be careful not to smear the belt with grease.
After replenishment, perform several test runs to allow the grease to spread evenly.
* For lubrication, use lithium grease No. 2.
When ordering the grease from SMC, please order a grease pack: GR-S-.
* Not applicable for clean series, secondary battery or special product. Please contact
SMC.
Table.3-1 Grease package (Lithium grease No. 2) A
Applied section
Product No.
Refer to the
above figure
GR-S-010 (10g)
GR-S-020 (20g)
3-3. Mount the dust seal band. ( Refer to Chapter 2 Mounting and removal of the dust seal
band and seal band stopper assembly)
Direction to pull the dust seal band to remove
Applicable model: LEFS/LEFB
This fig. shows belt Type
Same for ball screw type
Fig. 3-1 Position for application of grease
Dust seal band
Apply grease here (2 places)
Table

- 5 -
4. Replenishment of grease for the ball screw
4-1. Remove the dust seal band. ( Refer to Chapter 2 Mounting and removal of the dust
seal band and seal band stopper assembly)
4-2. Apply grease to the entire ball screw shaft using a spatula.
Slowly slide the table by hand so that the grease is applied to the inside of the ball
screw nut.
After replenishment, perform several test runs to allow the grease to spread evenly.
* For lubrication, use lithium grease No. 2.
When ordering the grease from SMC, please order a grease pack: GR-S-.
* Not applicable for clean series, secondary battery or special product. Please contact
SMC.
Table.4-1 Grease package (Lithium grease No. 2) A
Applied section
Product No.
Refer to the
above figure
GR-S-010 (10g)
GR-S-020 (20g)
4-3. Mount the dust seal band. ( Refer to Chapter 2 Mounting and removal of the dust seal
band and seal band stopper assembly)
5. LEFB Belt Tension Adjustment
Applicable model: LEFS
Ball screw shaft
Grease applied surface
Fig. 4-1 Places of grease application
Applicable model: LEFB
< Foreword >
It is recommended to use a belt tension meter.
If you do not have a belt tension meter, align the belt back to the original position that was
marked before removal.
Recommended belt tension meter: (Gates Unitta Asia: U-508)

- 6 -
Step motor (Servo/ 24VDC) / Servo motor (24VDC), LEFB25 AC servo motor
With the dust seal band removed as in Chapter 2 Mounting and removal of the dust
seal band and seal band stopper assembly, loosen the screw(2) which retains (3)
pulley holder assembly, and then rotate (1)tension adjusting screw. (Fig. 5-1)
LEFB32, 40 AC servo motor
With the dust seal band removed as in Chapter 2 Mounting and removal of the dust
seal band and seal band stopper assembly, the tension is adjusted by rotating
(1)tension adjusting screw. (Fig. 5-2)
Slide the table to the measurement position and enter the set values on the tension meter.
Measure the tension by flicking the belt on the specified side shown in Fig. 5-3. Fig.5-3
shows the position of the table and the measurement using the belt tension meter. Table
5-2 shows the values for setting and recommended tension of the tension meter.
Model Screw type Screw size
Tightening torque
+/- 10% [Nm]
Qty.
LEFB16∗T
Hexagon socket
head cap screw
M3x20
0.63
1
LEFB25∗T
M4x20
1.5
1
LEFB32T
M5x25
3.0
1
1
1
End cover
Fig.5-2. Part for belt tension adjustment 2
Fig.5-1. Part for belt tension adjustment 1
Measurement position
of the table
( L )
Belt
Point to measure
the tension
Fig.5-3 Position of the table and measurement
Table.5-1 Pulley holder assembly retaining screws
3
2
Housing A
Motor
Table

- 7 -
Model
Measurement
position of the
table
(L) [mm]
Set values for acoustic belt tension
meter
Recommended
belt tension [N]
+/-10%
WIDTH
[mm]
SPAN
[mm]
WEIGHT
（∗）
LEFB16∗T
170
6
200 2.5
30
LEFB25∗T
150
9
45
LEFB32T
130
15
75
LEFB25∗(S/T/V)
150
9
82
LEFB32∗(S/T/V)
130
15
136
LEFB40∗(S/T/V)
117
20
186
∗ Unit: g/mm (Width) x m (Length)
6. Mounting/ removal of the motor and peripheral equipments
(Ball screw type)
6-1. Remove the motor cover
6-1-1. Step motor (Servo/ 24VDC) and servo motor (24VDC)
Inline motor mounting type
Remove the screws (1). Hold the rubber bushing (4) while removing the end cover (2)
from the rubber bushing upward. Remove the motor cover (3), and remove the
grommet from the cable (5).
Part to be
tightened Model
Screw
Tightening
torque +/-
10% [Nm]
Type Size Qty.
(2) End cover
LEFS16
∗∗
-
∗
(1) Cross recessed round
head screw
M3x80
2 0.32
LEFS16
∗∗
-
∗
B
M3x120
LEFS25∗∗-∗M3x75
LEFS25
∗∗
-
∗
B
M3x120
LEFS32
∗
-
∗
M3x80
4
LEFS32
∗
-
∗
B
M3x130
LEFS40
∗
-
∗
M4x100
0.76
LEFS40∗-∗B
M4x150
Table.5-2 Data required for setting the tension meter that are recommended to tension the belt.
Applicable model: LEFS
2
1
4
5
3
Table.6-1 Motor cover fixing screws

- 8 -
Parallel motor mounting type (without lock)
(6) Insert something flat such as a cable tie behind the fingers of the motor cover to
lift the fingers.
Parallel motor mounting type (with lock)
(6) Lift the fingers of the motor cover to remove the cover. Referring to the removal
procedure of 6-2-2, remove the motor. And then, remove the motor cover with lock(8)
holding the grommet(7).
6
7
8
6
Finger
Finger

- 9 -
6-1-2. AC Servo Motor
Remove the screw(1). Hold the grommet(4) while removing the end cover(2) from the
grommet downward. Remove the motor cover (3), and remove the grommet from the
cable (5).
Part to be tightened Model
Screw
Tightening
torque +/-
10% [Nm]
Type Size Qty.
(2) Motor end cover
LEFS
∗
25(S/T/V)
∗∗
-
∗
(1) Cross recessed
round head screw
M3x110
2 0.32
LEFS
∗
25(S/T/V)
∗∗
-
∗
B
M3x150
LEFS
∗
32(S/T/V)
∗∗
-
∗
M3x115
4
LEFS
∗
32(S/T/V)
∗∗
-
∗
B
M3x145
LEFS
∗
40(S/T/V)
∗∗
-
∗
M4x135
0.76
LEFS∗40(S/T/V) ∗∗-∗B M4x165
For a replacement of motor cover, order the part referred in the spare parts list in the
attachment.
6-2. Remove the motor.
3
2
4
5
1
Table.6-2 Motor cover fixing screws
Caution)
When the motor of AC servo type is replaced, Encoder Z-
phase detecting position is
changed inevitably. (Max. 1 lead)
Adjust the home position shift distance according to the actual machine, in case of using
Z-phase for home position rerurn.
If encoder Z-phase detecting position must not be changed, actuator should be repaired in
SMC factory.

- 10 -
6-2-1. Inline motor mouning type
LEFS16/25 Step motor (Servo/ 24VDC) and servo motor (24VDC)
Remove the screw (9) and motor assembly(10). Remove the screw(11) and
motor(13) from the motor mount(12).
Part to be
tightened Model
Screw
Tightening
torque +/-
10% [Nm]
Type Size Qty.
(13)Motor
LEFS16
(11) Cross recessed round head screw
M2.5x12
2
0.36
LEFS25
M3x14
0.63
(10) Motor
assembly
LEFS16
(9) Hexagon socket head cap screw
M3x20
3
0.63
LEFS25
M4x25
2
1.5
LEFS32/40 Step motor (Servo /24VDC) and servo motor (24VDC)
LEFS25/32/40 AC servo
Remove the screws (9) and then, remove the motor (13) from the motor mount (12).
13
11
Motor with lock.
9
∗Do not loosen
the screw
connecting the
motor and the
lock.
12
11
Table.6-3 Motor assembly fixing screws
Motor with lock.
9
13
12
12
∗ Do not loosen the screw
connecting the motor and the lock.
10
12
13
13
9

- 11 -
Part to be
tightened
Models
Screw
Tightening torque
+/- 10% [Nm]
Type
Size
Qty.
(13)
Motor
LEFS∗32∗∗-∗
(9) Hexagon
socket head cap
screw
M4x12
2
1.5
LEFS∗32∗-∗B
M4x55
2
LEFS∗40∗-∗
M4x12
2
LEFS∗40∗-∗B
M4x55
2
LEFS∗25(S/T/V) ∗∗-∗
M4x12
2
LEFS∗32(S/T/V) ∗∗-∗
M5x15
2
3.0
LEFS∗40(S/T/V) ∗∗-∗
M5x15
2
6-2-2. Parallel motor mounting type
LEFS16/25 Step motor (Servo/ 24VDC) and servo motor (24VDC)
Remove the screw (14). Then, remove the cover plate (15) and loosen the screws to
detention the belt (16), and then remove the belt.
Then, remove the screws (9) to remove the motor assembly (10).
LEFS32/40 Step motor (Servo/ 24VDC)
Remove the screws (14). Then, remove the cover plate (15) and loosen the screws to
detention the belt (16), and then remove the belt.
Then, remove the screws (9) from the nut (17), and then remove the motor assembly
(10).
Table.6-4 Motor assembly fixing screws
10
15
9
14
17
10
9
14
15
16
16

- 12 -
AC Servo Motor
Remove the screws (14). Then, remove the cover plate (15) and loosen the screws to
detention the belt (16), and then remove the belt.
Then, remove the screws (9) to remove the motor assembly (18).
Remove the screws (19) and then, remove the motor (21) from the motor adapter
(20).
Part to be
tightened Model
Screw
Tightening
torque +/-
10% [Nm]
Type Size Qty.
(15)Cover
Plate
LEFS*16(L/R)
∗∗
-
∗∗
(14) Round head
combination screws
M2.5x5
2
0.36
LEFS*25(L/R)***-** M3x6 4 0.63
LEFS*32(L/R) ∗∗-∗∗
M3x6
4
LEFS*40(L/R) ∗∗-∗∗ M3x6 4
(18)Motor
assembly
LEFS*16(L/R)∗-∗(9) Cross recessed round
head screw with washer
M2.6x7 2 0.36
LEFS*16(L/R)A
∗
-
∗
M2.5x7 2
LEFS*16(L/R)
∗
-
∗
B
M2.6x10 2
LEFS*25(L/R)∗-∗(9) Cross recessed binding
head screw
M3x6
2
0.63
LEFS*25(L/R)∗∗-∗B M3x8 2
LEFS*25(L/R)(S/T/V) ∗∗-∗∗
(9) Hexagon socket head
cap screw with washer
M3x8 2
LEFS*32(L/R)
∗
-
∗
(9) Cross recessed round
head screw with washer
M4x14
2
1.5
LEFS*32(L/R)
∗
-
∗
B
M4x60 2
LEFS*32(L/R)(S/T/V) ∗∗-∗∗
(9) Hexagon socket head
cap screw with washer
M4x12 4
LEFS*40(L/R)∗-∗(9) Cross recessed round
head screw with washer
M4x14
2
LEFS*40(L/R)∗-∗B M4x60 2
LEFS*40(L/R)(S/T/V)∗∗-∗∗
(9) Hexagon socket head
cap screw with washer
M4x12 4
LEFS*32(L/R)
∗
-
∗∗
(17) Nut
M4:type 1
2
-
LEFS*40(L/R)
∗
-
∗∗
(17) Nut M4:Type 1 2 -
(21)Motor
LEFS*25(L/R)(S/T/V)
∗∗
-
∗∗
(19) Hexagon socket head
cap screw 19
M4x12
2
1.5
LEFS*32(L/R)(S/T/V)
∗∗
-
∗∗
M5x15 4 3
LEFS*40(L/R)(S/T/V)∗∗-∗∗
M5x15
4
19
21
18
20
9
Table.6-5 Fixing screws of motor assembly and cover plate
16
14
15

- 13 -
6-3. To fit the belt back, mount the belt in reversed order of 6-1 to 6-2. Points to be Noted
for Assembly
Caution 1): For LEFS inline motor type, before tightening the screw (9), move the
table after temporarily tightening the screw (9) and confirm that the motor
can rotates smoothly.
If there is a play of the motor assembly, insert the motor assembly correctly
to the spider.
Caution 2): For step motor (servo 24VDC) and servo motor (24VDC), please be
careful with the wiring of the cable and the mounting direction of the motor
cover.
Caution 3): Dispose of the used screws. For new screws without adhesive, apply
Loctite 262.
Caution 4): If the motor is parallel mounting type, it is necessary to adjust the belt
tension.
Adjustment using belt tension tool
Place the plate (23) onto the return plate (22).
S
model
Part No.
LEFS∗16∗(L/R)
LEF-B016
LEFS∗25∗(L/R)∗
LEF-B025
LEFS∗32(L/R)∗
LEF-B032
LEFS∗40(L/R)∗
LEF-B040
LEFS25
Reference mark
LEFS16
Reference mark
LEFS40
LEFS32
∗Cable entry of
LEFS40 is
on the right
Table.6-6 Tension adjustment jig
23
22

- 14 -
Set the belt tension tool (25) to the pulley (24). Then, place the nozzle at the end of
the plunger (26) to the plate.
Place the motor and the table as the drawing below, and then tighten the plunger
until the end of the plunger or the nut contact the plate. Once the plate is
contacted, loosen the plunger for 1/6 turn, and then tighten the screw which
holds the motor.
25
24
26
LEFS∗16, 25∗(L/R)
LEFS∗32, 40*(L/R)
Nut

- 15 -
Adjustment using tensile force
Pull the base of the motor with a cord or a long cable tie. With tensile force
adjusted (Table.6-7), tighten the screws which secure the motor.
7. Mounting/ removal of the motor and peripheral equipments (Belt type)
7-1. Remove the motor cover.
7-1-1. Step motor (Servo /24VDC) and servo motor (24VDC)
After removing the screws (1) and the end cover (2), remove the cable (4) from the
rubber bushing (3), and then remove the motor cover (5).
Tension adjustment
example
Tensile
force
Table.6-7 Replacement Belt part No. and tensile force
Size Replacement Belt part No.
Tensile
force [N]
16
LE-D-6-1
9.8
25
LE-D-6-2
19.6
32
LE-D-6-3
49.0
40
LE-D-6-4
98.1
Applicable model: LEFB
2
1
3
5
4

- 16 -
7-1-2. AC Servo Motor
Remove the screw(1). Hold the rubber bushing(3) while removing the end cover (2)
and motor cover (5) from the rubber bushing. Then, remove the rubber bushing from
the cable (4).
For a replacement of motor cover, order the part referred in the spare parts list in the
attachment.
Part to be
tightened
Models
Screw
Tightening torque
+/- 10% [Nm]
Type
Size
Qty.
(2) End cover
LEFB16∗T-∗
(1) Cross recessed
round head screw
M3x70
2
0.32
LEFB16∗T-∗B
M3x120
2
LEFB25T-∗
M3x85
2
LEFB25T-∗B
M3x130
2
LEFB25SAT-∗
M3x70
2
LEFB25AT-∗B
M3x110
2
LEFB32T-∗
M3x100
4
LEFB32T-∗B
M3x145
4
Part to be
tightened
Models
Screw
Tightening torque +/-
10% [Nm]
Type
Size
Qty.
(2) End cover
LEFB25∗(S/T/V)∗S-∗
(1) Cross recessed
round head screw
M3x95
2 0.32
LEFB25 (S/T/V)∗S-∗B
M3x135
LEFB32 (S/T/V)∗S-∗
M3x100
4
LEFB32∗(S/T/V)∗S-∗B
M3x125
LEFB40∗(S/T/V)∗S-∗
M4x120
0.75
LEFB40∗(S/T/V)∗S-∗B
M4x150
Table.7-1 Motor cover fixing screws
Table.7-2 Motor cover fixing screws
1
2
5
3
4

- 17 -
7-2. Remove the motor.
7-2-1. Step motor (Servo /24VDC) and servo motor (24VDC)
Remove the screws (8) with the belt tension loosened as the Chapter 5 Belt Tension
Adjustment, remove the motor assembly (9).
7-2-2. AC Servo Motor
LEFB25∗(S/T/V)∗S
Remove the screws (8) with the belt tension loosened as the Chapter 5 Belt Tension
Adjustment, remove the motor assembly (9).
LEFB32,40∗(S/T/V)∗S
Remove the screws (8) and then, remove the motor assembly (9).
* It is not necessary to loosen the belt tension for LEFB32,40∗(S/T/V)∗S.
Caution)
When the motor of AC servo type is replaced, Encoder Z-
phase detecting position is
changed inevitably. (Max. 1 lead)
Adjust the home position shift distance according to the actual machine, in case of using
Z-phase for home position rerurn.
If encoder Z-phase detecting position must not be changed, actuator should be repaired in
SMC factory.
9
8
8
9

- 18 -
Part to be
tightened
Models
Screw
Tightening torque
+/- 10% [Nm]
Type
Size
Qty.
(9) Motor
assembly
LEFB16T-∗
(8) Hexagon socket
head cap screw
M2.6x20
2 0.36
LEFB16AT-∗
M2.5x20
LEFB25∗T-∗
M3x35
0.63
LEFB32T-∗
M4x12
4
1.5
LEFB32T-∗B
M4x55
2
LEFB25∗(S/T/V)∗S-∗∗
M4x12
LEFB32∗(S/T/V)∗S-∗∗
M5x15
4 3
LEFB40∗(S/T/V)∗S-∗∗
M5x15
7-3. To refit the dust seal band, mount the belt in reversed order of 7-1 to 7-2. Points to be
Noted for Assembly
Caution 1): Before tightening the screw (8), move the table after temporarily
tightening the screw (8) and confirm that the motor can rotates smoothly.
If there is a play of the motor assembly, insert the motor assembly correctly
to the spider.
Caution 2): Adjust the belt tension to the recommended value of SMC
(Refer to the Chapter 5 LEFB Belt Tension Adjustment)
Caution 3): For AC servo motor, refer to the drawing below for the wiring of the cable
during mounting the motor cover.
Caution 4): Dispose of the used screws. For new screws without adhesive, apply
Loctite 262.
For the replacement of the motor assembly, order the parts referring to the spare parts
list in the attachment.
Table.7-3 Motor assembly fixing screws
Encoder cable
Motor cable