Makita 4351CT Manual

Model No.
Description
PRODUCT
CONCEPT AND MAIN APPLICATIONS
P 1 /15
Specification
Standard equipment
Note: The standard equipment for the tool shown above may differ from country to country.
4351T, 4351CT, 4351FCT
Jig Saw
Models 4351T, 4351CT and 4351FCT have been developed
as the successor models of 4341T series models.
In addition to the advantages of the predecessor models,
feature new exterior design with ergonomic rubberized handle.
Top handle type models are also available as 4350T series models.
Optional accessories
Jig saw blades No.51, 58, 59, B-8, B-10 to B-19, B-21 to B-27, B-16L, BR-13
Guide rule, Guide rail, Guide rail adaptor, Anti-splintering device
Hose complete 28-5, Dust nozzle
Specification
Net weight: kg (lbs) 2.4 (5.3) 2.5 (5.5)
Model 4351CT 4351FCT
No load speed: strokes per min.
SteelCapacities: mm (") Wood*1 10 (3/8)
Aluminum 20 (25/32)
135 (5-5/16)
800 - 2,800
Length of stroke: mm (") 26 (1)
Shank type B-type
Protection against electric shock
Power supply cord: m (ft) 2.5 (8.2)*2
Double insulation
*1 when cutting with optional blade No.B-16L *2 Australia, New Zealand: 2.0m (6.6ft)
Cut settings 3 Orbital settings + Straight cutting
Yes (Push-in-lock system)
LED Job light
Variable speed control by dial
Soft start
Constant speed control
Toolless blade change
Yes
Yes
Yes
No
4351T
2,800
No
No
No
No Yes
Electronic control
4351CT/ 4351FCT
120
110
220
230
240
6.9 720
--- 320 70050/60
3.4 720 320 70050/60
3.3 720 320 70050/60
3.2 720 320 70050/60
6.3 320 70050/60
4351T
Dimensions: mm (")
Width (W)
Height (H)
Length (L) 271 (10-11/16)
73 (2-7/8)
187 (7-3/8)
L
H
W
TECHNICAL INFORMATION
Continuous Rating (W)
Voltage (V) Cycle (Hz) Input Output Max. Output (W)
220
230
240
Current (A)
2.8 580 300 55050/60
2.7 580 300 55050/60
110
120 5.6 580 300 55050/60
5.1 --- 300 55050/60
2.5 580 300 55050/60
Jig saw blade B-10 ........ 2
Jig saw blade BR-13 ...... 2
Jig saw blade B-22 ........ 2
Cover plate ....................... 1
Anti-splintering device ..... 1
Hex wrench 4 ................... 1
Plastic carrying case ...... 1
Dust nozzle*3................ 1
*3 for European countries only

Repair
P 2 / 15
< 1 > Lubrication
Apply Makita grease FA. No.2 to the portions marked with black triangle, and machine oil No.120
to the portions marked with gray triangle to protect parts and product from unusual abrasion.
Linear guide
Linear guides
Balance plate
Balance plate
Gear complete
Push plate
Retainer
Push plate
Retainer
Slider
Crank complete
Pins of Gear housing cover
for supporting Balance plate
Push pin
Push pin
Blade holder
Gear housing
Needle bearing 407
Hex. socket head bolt
M4x12 (two pcs in total): See Note below.
Note: When removing two M4x12 Hex. socket head bolts illustrated above, put the appropriate amount of Loctite
241/242 or ThreeBond 1321/1342 on the thread of the screws and then fasten them.
Gear housing
A
B
C
DescriptionItem (Code No.) Portion to lubricate
Makita grease FA. No.2
(042025-8A: 2.5kg)
The positions painted with gray
The pins which supports Balance plate.
The portion where contacts Gear complete.
The portion where contacts Retainer.
The portion where contacts Push plate.
The portion where contacts Slider.
The portion where contacts Dust seal.
Slider The portion where contacts Needle bearing 407.
The hole where Rod reciprocates.
Gear housing cover
Gear housing cover Its whole part
Machine oil No.120
Rod
Rod
Ratchet head 9.5 (for 1R219)
Round bar for arbor 6-100
Retaining ring pliers with long bent nails
1/4" Hex. shank bit M4 for Hex. socket head bolt
1/4" Hex.shank bit for M4
Bearing setting pipe 16-8.2
DescriptionCode No. Use for
1R026
1R235 Inserting Self lock 6
Removing/ Installing Retaining ring S-8 in Crank housing
Replacing Ball bearings
Securing Crank
134873-0
Removing/ Installing Retaining ring R-18
Fastening M4x12 Hex. socket head bolts
Socket adapter (for 1R219)
Retaining ring S and R pliers
Torque wrench shaft 2-6N.m
Bit adapter ass'y
1R291
1R311
1R014
1R220
1R222
1R228
1R254
134873-0
1R269 Bearing extractor
CAUTION: Unplug the tool and remove the jig saw blade for the safety before maintenance !

Repair
P 3 / 15
Hex socket head bolt M5x18
Base
Torsion spring 6
Tool opener
+ Pan head screw M4
+ Pan head screw M4
[2] Disassembling Tool opener
1. Remove M5x18 Hex socket head bolt. Base is separated from product. (Fig. 1)
2. Remove M4 + Pan head screw. Tool opener and Torsion spring 6 are separated. (Fig. 2)
[3] Assembling tool opener
1. Install Torsion spring 6 into the depression on Gear housing cover around Tool opener hinge portion, and then fasten
Tool opener to Gear housing cover with M4 + Pan head screw.
2. Turn the tail of Torsion spring 6 clockwise using thin flat screwdriver to set it in place. (FIg. 3)
Fig. 1 Fig. 2
The tail of
torsion spring 6
Blade holder
Tool opener
Gear housing cover
Gear housing
Viewed from Blade holder side
[4] Disassembling Head cover section
1. Separate Head cover R from Head cover L by the following steps.
(1) Removing two 4x40 Tapping screws and a 4x50 Tapping screw. (Fig. 4)
(2) Gently lift up the specific area around the hole for 4x50 Tapping screw (designated in gray color in Fig. 4) with
slotted screwdriver in order to remove the hooks of head covers R and L from the nottches of Motor housing. (Fig. 5)
Note: Take care not to break the hooks, the protrusion and the depressions when disassembling.
2. LED circuit (only for 4351FCT) and Safety wire can be removed together. As for removal of Safety wire, open Tool
opener and remove both tails of Safety wire from the holes of Gear housing cover behind Head covers L and R.
Tapping
screws 4x40
Tapping
screw 4x50
Tool opener Protrusion
Hook
Hook
Depression
for Head
cover L's
protrusion
Safety wire
Lift up this area with
slotted screwdriver.
Fig. 3
Fig. 4
Tool opener hinge portion
Safety wire
Depression for
Head cover L's hook
Depression for Head cover R's hook
Fig. 5

Repair
P 4 / 15
1. After separating Safety wire from Gear housing cover, remove four 4x16 Tapping screws CT .
Gear housing cover is separated from Gear housing as illustrated in Fig. 6.
[5] Disassembling Gear housing cover section
Tapping screws
CT 4x16 Gear housing cover
Gear housing
Fig. 6
Fig. 7
2. Remove Stop ring E-3 with slotted screwdriver.
Push Slider to the lower dead point. (Fig. 7)
Stop ring E-3
Pin 4
Rod
Slider
Slider in the lower
dead point
Rod
3. Slide Pin 4 in order to disconnect Rod with Slider. And then, pull out Rod from Gear housing cover.
Separate Linear guides from Gear housing by removing four M4x10 Pan head screws .
Pin 4, Slider and Leaf spring are disassembled from Gear housing cover. (Fig. 8)
Note: When reassembling, be sure to the direction of Leaf spring illustrated above.
Rod
Pin 4
Slider
Pin 4
Slider
Linear guides
Linear guides
Pan head
screws M4x10
Leaf spring
Gear housing cover
Fig. 8

Repair
P 5 / 15
Face the roll portion
to the opposite side
of Gear housing cover
Gear housing cover
Leaf spring
3. After aligning the holes of Slider and Rod, insert Pin 4 into the aligned hole from left side as illustrated in Fig. 11.
4. Recline Slider fully and insert a pair of Linear guides as illustrated in Fig. 12.
5. While lifting up the flat side of Leaf spring, lay a pair of Linear guides to put the flat side of Leaf spring on Linear
guides as illustrated in Fig. 13.
6. Move Slider to the center of Linear guides. Fasten Linear guides with four M4x10 Pan head screws as illustrated in Fig. 14.
1. Assemble Tool opener to Gear housing cover with referring to Figs. 1, 2 and 3 in page 3.
2. Put Leaf spring in Gear housing cover. Pay attention to its assembling direction. (Fig. 9)
Insert Rod into Gear housing cover. Pay attention to the direction of the hook of Blade holder as illustrated in Fig. 10.
[6] Assembling Gear housing cover section
Tool opener
Rod
ass'y
Hook of Blade holder
Face the hook of Blade
holder to the hook of
Tool opener when installing
Rod ass'y. Refer to Fig. 10.
Hook of Blade holder
Gear housing cover Hook of Tool opener
Lift up the flat side
of Leaf spring.
Lay Linear guides.
Leaf spring
Linear guides
Gear housing cover
Note:
Linear guides have to be
put between Gear housing
cover and the flat side of
Leaf spring.
Slider
Move Slider to the
center of Linear guides.
Note: Attach the ends of Linear guides to the two protrusions
in the Gear housing cover when fastening them.
Pan head screws M4x10
Fig. 9
Fig. 11
Fig. 13
Fig. 14
Fig. 12
Fig. 10
Hole of Rod
Holes of Slider
Pin 4
(to the aligned hole)
Linear guides
View in Gear housing cover
Slider
The ends of Linear guides
The two protrusions in
the Gear housing cover

Repair P 6 / 15
Stop ring E-3
Pin 4
Rod
7. Install Stop ring E-3 to secure Pin 4 as illustrated in Fig. 15.
8. Check whether Slider can reciprocate on Linear guides smoothly.
Note: If Slider does not reciprocate smoothly, Linear guides may lean to the left or the right.
Try again to assemble Linear guides correctly.
9. Lubricate the parts assembled in Gear housing cover. Refer to [1] Lubrication in page 2.
10. Align Slider to Needle bearing 407 on crank complete, and then assemble Gear housing cover section to Gear housing
as illustrated in Fig. 16. Do not forget to assemble packing between Gear housing cover and Gear housing.
See Fig. 17.
Slider
Linear guide
Tapping screws CT 4x16
Safety wire
Gear housing cover
Packing
Crank complete
Balance plate
Needle bearing 407
Slider
Gear housing
Gear housing
cover
Fig. 15
Fig. 16
Fig. 17

Repair
P 7 / 15
[7] Disassembling blade holder
[8] Assembling blade holder
1. Disassemble Rod with referring to [ 5] Disassembling Gear housing cover section in page 4.
2. Disassemble Dust cover, and then disassemble Retaining ring R-18 as illustrated in Fig. 18.
Blade holder and Torsion spring 15 are separated from Rod as illustrated in Fig. 19.
1. Apply Makita grease FA No.2 to Push pin.
Insert Push pin to Rod.
Insert the short hook end of Torsion spring 15 to Rod. (Fig. 20)
2. Align the mark of Blade holder and the long hook end of Push pin, and then cover Blade holder on Rod with Torsion
spring 15. (Fig. 21)
3. Bring the long hook end to the space A of Blade holder by turning clockwise. (Fig. 22)
4. Push Rod into Blade holder, and then assemble Retaining ring R-18 to the groove in Blade holder. (Fig. 23)
5. Install Dust cover as illustrated in Fig.24.
Dust cover
Retaining
ring R-18
Rod
Blade holder
Blade holder
Torsion spring 15
Note: Be careful not to lose Push pin when disassembling.
The short hook end
of Torsion spring 15
Fig. 20
Push pin
Push pin
Rod
Hole for
Push pin Hole for Torsion
spring 15
The mark of
Blade holder Blade
holder
Fig. 21 Fig. 22
The long hook end of Torsion
spring 15
Space A
Retaining ring R-18 Dust cover
Press dust cover
to Blade holder.
Fig. 18
Fig. 23 Fig. 24
Fig. 19
The long hook end
of Torsion spring 15

Repair
P 8 / 15
[9] Disassembling parts in Gear housing
2. While Locking Crank complete with 1R235, remove two M4x12 Hex socket head bolts. (Fig. 26)
3. Disassemble Retaining S-8. Then, the inner parts are disassembled from Gear housing as illustrated in Fig.27.
Caution: The above M4x12 Hex socket head bolts are threadlocked
with adhesive.
2 pcs. of hex socket
head bolts M4x12
Crank complete
Balance plate
No.1R235
Round bar for arbor
Retaining ring S-8
Retaining S-8
Push plate
Seal plate
Needle bearing 407 (It is easy to drop out of Gear complete.
Therefore, do not miss it.)
Flat washer 8
Gear housing
Balance plate
Gear complete
1. After separating Safety wire from Gear housing cover, remove four 4x16 Tapping screws CT .
Gear housing cover is separated from Gear housing as illustrated in Fig. 25.
Tapping screws
CT 4x16 Gear housing cover
Gear housing
Fig. 25
Fig. 26
Fig. 27

Repair
P 9 / 15
[10] Assembling parts in Gear housing
1. Pass the shaft of Gear housing through Flat washer 8. (Fig. 28)
2. After assembling Seal plate to Push plate, pass the shaft of Gear housing through Push plate with Seal plate. (Fig. 29)
3. Lubricate the parts with referring to [1] Lubrication in page 2.
4. Pass the shaft of Gear housing through Gear complete and Balance plate. (Fig. 30)
5. Assemble Crank complete to Gear housing. Push down Crank complete while turning it until the groove on
shaft of Gear housing can be seen. (Fig. 31)
6. While locking crank complete with 1R235, fasten Crank complete with two M4x12 Hex socket head bolts with
adhesive. (Fig. 32)
7. Install Retaining ring S-8 to the groove on the shaft of Gear housing to secure the components. (Fig. 33)
Note: Do not fasten with the used M4x12 Hex socket head bolts. The fresh M4x12 Hex socket head bolts with
adhesive have to be used. The fastening torque of these bolts has to be 2.4 - 3.5 N.m.
Flat washer
8
Gear housing
Push plate
Seal plate Gear complete
Balance
plate
Fig. 31 Fig. 32
Press down Crank complete until the groove
on the shaft of Gear housing can be seen.
Crank complete
M4x12 Hex socket head bolts
Crank complete
Balance plate
Retaining ring S-8
1R235
Retaining ring S-8
Flat washer 8
Push plate
Seal plate
Balance plate
Gear complete
Crank complete
Shaft of Gear housing
Groove on the shaft of Gear housing
for Retaining ring S-8
Fig. 28
Fig. 33
Fig. 29 Fig. 30
Shaft of Gear housingShaft of Gear housing

Repair
P 10 / 15
[11] Disassembling armature
1. With referring to the following section, disassemble Head covers L and R, and gear housing cover.
[4] Disassembling Head cover section in page 3
[5] Disassembling Gear housing cover section" at page 4
2 . Remove Rear cover by unscrewing 4 x 18 Tapping screw. And then, remove Carbon brushes. (Fig. 34)
Carbon brushes
Tapping screw 4x18
Rear cover
3. Remove Retaining ring S-8, and separate Crank complete, Balance plate and Gear complete from the shaft of Gear
housing as illustrated in Fig. 35.
Note: It is not necessary to remove M4x12 Hex socket head bolt, Crank complete and Gear complete from
Balance plate.
Be careful not to lose Needle bearing 407.
Retaining S-8
Crank complete
Needle bearing 407
Balance plate
4. Remove four 4x30 Tapping screws, and then separate Gear housing from Motor housing.
Separate Armature from Gear housing by striking Gear housing with plastic hammer. (Fig. 36)
4x30 Tapping
screws Gear housing
Armature
Motor housing
Gear complete
5. Remove Self lock with slotted screwdriver. Magnet sleeve, Wave washer 6 and Rubber ring 19 are removed from
Armature shaft. Fig. 37.
Self lock
Magnet sleeve (It is not used for model 4351T.)
Wave washer 6
Rubber ring 19
Ball baring 607
Insulation washer
Fig. 34
Fig. 35
Fig. 36
Fig. 37

Repair
P 11 / 15
[12] Assembling armature
Do not assemble the used self lock. The self lock has to be always replaced with the fresh one.
Pay attention to the assembling direction of Self lock and Wave washer 6. (Fig. 39)
Magnet sleeve is installed to the armature shaft on commutator side for sensing the variation of rotating speed.
If it would be damaged, the electronic speed control does not work any more.
Therefore, press Magnet sleeve by hand carefully instead of arbor press while applying 1R026 to self lock.
Self lock
Wave washer 6
Magnet sleeve
Insulation washer
Ball bearing 607LLB Rubber ring 19
[13] Disassembling Lever 17 (for orbital action mode change)
1. With referring to the following section, Head covers L and R, and Gear housing cover.
[4] Disassembling Head cover section section in page 3
[5] Disassembling Gear housing cover section in page 4
2. Remove Stop ring E-5 from the shaft of Lever 17 with slotted screwdriver. (Fig. 40)
3. While aligning Lever 17 with indication III, pull it out from Gear housing. (Fig. 41)
Then, Cap 5 and Compression spring 3 are removed. (Fig. 42)
Stop ring E-5 Align Lever 17 with indication III.
Compression
spring 3
Cap 5
Lever 17
6. Remove Ball bearing 607 LLB from Armature shaft as illustrated in Fig. 38.
Ball bearing 607 LLB Insulation washer
1R269
Fig. 38
Fig. 39
Fig. 40 Fig. 41 Fig. 42
Note:

Repair
P 12 / 15
[14] Disassembling Motor section
1. Remove Rear cover from Motor housing by unscrewing 4x18 Tapping screw.
2. Disconnect the connector of LED circuit. the electric parts module can be pulled out from Motor housing. (Fig. 43)
3. With referring to [4] Removing Head cover in pages 3 and 4, remove Head covers and Gear housing cover.
4. Remove carbon brushes.
5. After removing Retaining ring S-8 from the shaft of Gear housing, separate the Crank section from Gear housing
by striking Gear housing. Disassembling the Crank section is not required for removal of Motor section. (Fig. 44)
6. After removing 4x30 Tapping screws, remove Gear housing from Motor housing by striking Gear housing.
Armature can be removed together with Gear housing as illustrated in Fig. 45.
7. Move Switch rod with 1R291 in the direction illustrated by arrow and remove Switch lever from Motor housing.
(Fig. 46)
Switch rod
Switch lever 1R291
1. Insert Switch rod into Motor housing to align their wide square holes. Figs. 47 and 47A.
2. While pressing Switch rod to the wall of Motor housing, insert Switch lever into the aligned wide square holes.
3. Push Switch rod in direction to Gear housing side on condition that Switch lever is in OFF position. Switch lever and
Switch rod can be interlocked.
4. Connect the connector of LED circuit.
[15] Assembling Motor section
Switch lever
Switch lever Motor housing
Motor housing
Switch rod
Wide square hole of switch rodWide square hole of
motor housing
Fig. 44 Fig. 45
Fig. 45
Fig. 46
Crank section
Retaining ring S-8
Shaft of
Gear housing
Fig. 43
Connector of LED circuitMotor housing Electric parts module Rear cover
4x18 Tapping screw
Tapping
screws
4x30 Gear housing
Armature
Motor housing

P 13 / 15
4351CT (with controller, without LED job light)
4351FCT (with controller and LED job light)
: Connecting with terminal
Controller
Switch block unit
Noise
suppressor Noise suppressor is not used
in some countries.
SB8
SB7
SB6
SB5
SB4
SB3
SB2
SB1
SB9
Switch
CT1
CT3
CT4
CT2
Brush
holder
Brush
holder
LED Job light
LED job light is not
installed in 4351CT.
This terminal is not
used in the product
for some countries.
This terminal is not
installed in the product
for low voltage.
Circuit diagram in the rear of motor housing
Power supply cord
Field

Wiring diagram
P 14 / 15
4351T (without controller and LED jog light)
4351T (without controller and LED jog light)
Circuit diagram in the rear of motor housing
: Connecting with terminal
Switch block unit
Noise
suppressor In case of noise suppressor with
two lead wires, put it into switch block
unit.
SB7
SB6
SB4
SB3
SB2
SB1
Switch SB5
Power supply cord
Brush
holder
Brush
holder
This noise suppressor is
not used for some countries.
To be connected to field core.
Noise
suppressor
Support
unit
Support
unit
Field
Noise
suppressor
Motor housing
Grounding terminal
Fix grounding lead wire
(see-through) with lead
holder. Lead holder
Do not slack the grounding lead
wire (see-through) between lead
holder and grounding terminal.

Wiring diagram
P 15 / 15
4351FCT
Lead wire for
LED circuit
Lead wire for
LED circuit
Put Lead wire for LED circuit into Lead wire holder.
Put Lead wire for LED circuit into Lead wire holders
in Head cover L.
Lead wire holders
Lead wire holder
Hole for Lead wire
of LED circuit
Route Lead wire for LED circuit as follows:
1) through the hole of Motor housing
2) in Lead wire holders
3) in groove
Groove
Lead wire for
LED circuit
Lead wire holders