Makita EX2650LH Saw User manual
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Makita EX2650LH is a versatile power head designed for various garden and agricultural tasks, featuring a split system for easier mobility and a clean 4-stroke engine with multi-position lubrication, enabling continuous operation without emitting white smoke or burning engine oil smell. Its multi-tool system, consisting of the power head and optional attachments, allows for a wide range of applications, including brush cutting, string trimming, pole sawing, pole hedge trimming, cultivating, and coffee harvesting.
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T
ECHNICAL INFORMATION
Models No.
Description
EX2650LH
Multi Function Power Head H
PRODUCT
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C
ONCEPT AND MAIN APPLICATIONS
Model EX2650LH loaded with 25.4mL Makita 4-stroke engine is a power head designed for versatile garden and agricultural applications.
L
The following advantages make this product ideal for a wide range of garden and agricultural applications:
• Split system of Power head and Attachment provides easier mobility.
• Clean 4-stroke engine equipped with our unique multi-position
engine lubrication system that enables the engine to be inclined
to any angle with no emission of white smoke and smell of
burning engine oil even during continuous operation
• Multi-tool system consisting of the power head and versatile
optional attachments
Dimensions: mm (")
Length (L)
Width (W)
Height (H)
975 (38-3/8)
242 (9-1/2)
323 (12-3/4)* 1
241 (9-1/2)
*1: for the countries where Barrier bar
is required by the standards of
brushcutter.
S
pecification
Engine
Engine oil
Type
Displacement: cm³ (cu.in.)
Fuel
Max. output: kW
Max. torque: N.m
Carburetor
Starting system
Fuel tank capacity: mL (US oz)
Primer pump
Clutch
Handle style
Rapid start
Net weight* 4 : kg (lbs)
4-stroke
25.4 (1.55)
Straight unleaded gasoline* 2
0.77 (at 7,000 min.
ˉ ¹)
1.1 (at 5,500 min.
ˉ ¹)
SAE10W-30 oil in the class SF or higher of API Classification
Diaphragm
Recoil starter, with mechanical decompression
600 (20.3)
Yes
Yes
Loop handle
No* 3
4.6 (10)
*2: Brazil: 25E gasoline
*3: However, equipped with mechanical decompression
*4: Dry weight
S
tandard equipment
Shoulder harness with single shoulder strap .............................................. 1
Socket wrench 16-17 ................................................................................. 1
Hex wrench 4 .............................................................................................. 1
Accessory bag ............................................................................................ 1
Oil set (oil bottle containing 80mL engine oil) ......................................... 1
Note: The standard equipment for the tool shown above may vary by country.
O
ptional accessories
Brush cutter attachment
String trimmer attachment
Pole saw attachment
Pole hedge trimmer attachment
Cultivator attachment
Coffee harvester attachment
Carrying bag
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CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.
[1] NECESSARY REPAIRING TOOLS
Code No.
Description Use for
1R004
1R006
Retaining ring pliers ST-2 for External ring removing/ assembling Retaining ring S-12
Retaining ring pliers RT-2E for Internal ring removing/ assembling Retaining ring R-24
1R028
1R031
1R033
1R045
1R127
1R171
1R247
1R282
1R286
1R291
1R364
1R366
Bearing setting pipe 20-12.2
Bearing setting pipe 28-20.2
Bearing setting plate 10.2
Gear extractor (large)
Air density tester
T-type hex. wrench 4-130
Round bar for arbor 20-100
Round bar for arbor 8-50
Round bar for arbor 12-50
Retaining ring S and R pliers
Flywheel puller
Feeler gauge set
Hex socket bit 13
Wire brush
M10-17 Hex. nut pressfitting Spiral bevel gear 14 (the component of Cutter shaft set) removing Spiral bevel gear 14 (the component of Cutter shaft set) removing Cutter shaft set removing Ball bearing 6001LLU diagnosing Carburetor removing / assembling M5 Hex socket head bolt removing Clutch drum removing Spiral bevel gear 14 (the component of Cutter shaft set) pressfitting Clutch drum removing / assembling Retaining rings removing Flywheel
Adjusting Ignition coil, Spark plug and Rocker arm assembly removing / assembling Flywheel making Spark plug clean removing Cutter shaft set
[2] HANDLING OF GASKET
When Gasket is removed:
(1) clear something that is sticking on the matching portions with Gasket.
(2) replace Gasket with the new one.
[3] LUBRICANT / ADHESIVE APPLICATION
Apply a little amount of Makita grease N No.2 to Spiral spring in Recoil starter and the spline ends of Shaft.
Apply 8g Makita grease N No.2 into Gear case after cleaning the inside.
Once the engine is diassembled, put ThreeBond 1216 to the matching surface of Crank case and Cylinder block for the reassembly. (Fig. 64)
[4] DISASSEMBLY/ASSEMBLY
[4]-1. Warning
Obey the following instructions in advance before repairing.
• Wear gloves.
• Keep the cover on the blade other than a trial of engine running.
• Cool down engine enough, as the engine just after used may cause you to get burned.
• Remove the remaining fuel in Tank and Carburetor completely.
• Repair the engine on the stable workbench and in the clean workplace to prevent dust and debris from entering.
• Record where and how the parts are assembled, and what are the parts. Do not reassemble them wrongly.
It is recommended to prepare the several kind of boxes to keep parts group by group.
• Treat the disassembled parts carefully. Clean and wash them certainly.
• When some bolts and screws are difficult to loosen, use Impact driver.
• Tighten the bolts and the screws to the specific torque as shown in Fig. 68.
• Once the main parts are assembled, check every move and sound by manually turning each part.
• Check the assembled parts by turning them manually if there is any unusual gap or sound around.
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[4] DISASSEMBLY/ASSEMBLY
[4]-2. Engine and Shaft
DISASSEMBLING Fig. 1
(1) Disconnect lead wire and grounding wire by removing each connector
after removal of Air cleaner cover. (Fig. 1)
(2) Remove Control cable from Insulator as follows:
• Loosen the nuts of Control cable so as to relax the holding to the hook of
Insulator. (Fig. 2)
• Disconnect Inner cable from Swivel of Carburetor.
(3) Loosen two M5x18 Hex socket head bolts on Pipe holder and remove M5x12
Hex socket head bolt. (Fig. 3)
Fig. 2 (4) Pull Shaft pipe B complete and Shaft B complete out of Engine. (Fig. 4)
Note: Shaft B complete in the Shaft B pipe complete may get stuck
at the spline engagement. If yes, use Waterpump pliers to pull out
the shaft. (Fig. 5)
Swivel
Inner cable of
Control cable
Connector (4pcs.)
Nut of Control cable
(2 pcs.)
Fig. 3 Fig. 4
Engine
Shaft pipe B complete
M5x12 Hex socket head bolt
M5x18 Hex socket head bolt (2pcs.)
Pipe holder
Shaft B complete
ASSEMBLING
Assemble by reversing the disassembly procedure.
• Set Control cable in place. (Figs. 2 and 6)
- Secure it on the hook of Insulator with two Nuts of Control cable.
- Fit Inner cable end into the groove of Swivel of Carburetor.
Note: Adjust the tension of the cable to allow the play 1mm up to 2mm.
Fig. 6
Hook of Insulator for Control cable
Fig. 5
Waterpump pliers
Shaft B complete
Inner cable end
Nuts to fix on the hook of Insulator
Control cable
Hook of Insulator for Control cable
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[4] DISASSEMBLY/ASSEMBLY
[4]-3. Brushcutter attachment
Fig. 7
DISASSEMBLING
(1) Loosen two M6x30 Hex. socket head bolts and remove Protector with Protector
extension attached. (Fig. 7)
(2) While pulling the side walls of Protector cover toward outside, remove Protector cover
from Shaft pipe A complete. (Fig. 8)
(3) Remove two M5x14 Hex socket head bolts and Protector clamp. (Fig. 9)
(4) Loosen M5x25 Hex socket head bolt and remove Gear case assembly from Shaft pipe
A complete. (Fig. 9)
(5) Pull Shaft A from Gear case installation side and then remove Retaining ring S-7 from
Protector
M6x30 Hex socket head bolt (2pcs.)
Shaft A. (Fig. 10)
(6) Push the projection of Leaf spring complete deeply and remove it from the hole of
Shaft pipe A complete. Slip the projection along the inside of Shaft pipe A complete
toward the shaft end. (Fig. 11) Leaf spring complete is removed from Shaft pipe A
Protector extension
complete.
Note: Pushing the projection hard causes the deformation of Leaf spring complete. Be careful of the handling.
Fig. 8
Shaft pipe A complete
Fig. 9
Shaft pipe A complete
Fig. 10
Shaft pipe A complete viewed from Gear case installation side
M5x14 Hex socket head bolt
M5x25 Hex socket head bolt
Retaining ring S-7
Protector cover
Side wall of Protector cover M5x14 Hex socket head bolt (2 pcs.)
Gear case assembly
Protector clamp
Shaft A
Fig. 11
Projection of Leaf spring complete
Spring portion of
Leaf spring complete
ASSEMBLING
Assemble by reversing the disassembly procedure.
[4]-4. String trimmer attachment
DISASSEMBLING
(1) Remove two M6x20 Hex. socket head bolts and Protector
from Clamp complete. (Fig. 12)
(2) Remove M5x10 Hex socket head bolt and Clamp complete
from Head case. (Fig. 12)
(3) Loosen M5x25 Hex socket head bolt and remove Head case
from Bent pipe assembly. (Fig. 12)
(4) Remove Bearing washer from Head case installation side of
Bent pipe assembly. (Fig. 13)
Remove Flexible shaft from Bent pipe assembly by pulling it
off from shaft joint side.
(5) Remove two M5x14 Screws. Cutter is removed from Safety
cover as drawn in Fig. 14.
Fig. 12
Bent pipe assembly
M5x25 Hex socket head bolt
Fig. 14
M5x14 Screw (2 pcs.)
Fig. 13
M5 Washer
(2 pcs.)
Bent pipe assembly viewed from Head case side
M6x20 Hex socket head bolt (2 pcs.)
Clamp complete
Head case complete
Protector
M5x10 Hex socket head bolt
M5 Spring washer
(2 pcs.)
Flexible shaft Bearing washer Safety cover Cutter
M5 Nut
(2 pcs.)
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[4] DISASSEMBLY/ASSEMBLY
[4]-5. Gear case assembly
DISASSEMBLING
(1) According to the clause of [4]-3, Remove Gear case assembly. (Refer to Figs. 7, 8 and 9)
(2) Remove M8x10 + Hex bolt that is the stopper of Grease inlet on Gear case set. (Fig. 15)
(3) Remove Retaining ring R-24 with 1R006. (Fig. 16)
(4) Remove an assembled part of Spiral bevel gear 14, Ball bearing 609ZZ and Retaining ring S-9 by striking Gear case
assembly against workbench as drawn in Fig. 17.
(5) Remove Retaining ring S-9 with 1R291.
(6) Receive Ball bearing 609ZZ with 1R031, then press down the top of Spiral bevel gear 14 using 1R282 with Arbor press
(Fig. 18) Refer to Fig. 19 for the components.
(7) Remove Retaining ring R-28 with 1R291. (Fig. 20)
(8) Preset Receive washer and 1R033 with M10-17 Hex. nut to Cutter shaft as drawn in Fig. 21, and give the impacts
using the plastic hammer. An assembled part of Cutter shaft complete, Ball bearing 6001LLU is removed.
Refer to Fig. 22 for the components.
(9) Remove Ball bearing 6001LLU with 1R045.
Fig. 15 Fig. 17 Fig. 18
Fig. 16
M8x10 + Hex bolt
Ball bearing 609ZZ
1R282
1R031
Retaining ring R-24
Fig. 19
Spiral bevel gear 14
(The component of Cutter shaft set)
Ball bearing 609ZZ
Retaining ring S-9
Retaining ring R-24
Fig. 21
Receive washer
Gear case
1R033
M10-17 Hex. nut
Workbench
Fig. 22
M8x10 + Hex bolt
Fig. 20
Cutter shaft set
Retaining ring
S-28
(Note: Spiral bevel bear 14 shown in Fig. 17 is also
the component.)
Ball bearing 6001LLU
Retaining ring R-28
ASSEMBLING
Assemble by reversing the disassembly procedure.
• Receive Gear case assembly with the U-shape table of Arbor press,
then press down Ball bearing 6001LLU using 1R028 with Arbor
press to insert Cutter shaft set in place. (Fig. 23)
Fig. 23
Ball bearing 6001LLU 1R028
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[4] DISASSEMBLY/ASSEMBLY
[4]-6. Shaft pipe B complete
DISASSEMBLING
(1) Remove two M5x25 Hex socket head bolts and Pipe clamp 24 from Shaft pipe B complete.
Clamp cover A, Pipe clamp 33 and Loop handle are removed. (Fig. 24)
(2) Remove four 4x18 Tapping screws and two M5x14 Hex socket head bolts from Control lever assembly.
Control lever assembly is now separated to L and R. (Fig. 25)
(3) Loosen M5x12 Hex socket head bolt and M6x25 Hex socket head bolt, and remove Joint 24 from Shaft pipe B complete.
(Fig. 26)
(4) Loosen M5x20 Pan head screw of Hanger set, and remove Hanger set itself and Spacer 24 from Shaft pipe B complete.
(Fig. 27)
(5) Pull out Shaft B complete from the pipe joint side of Shaft pipe B complete. (Fig. 28)
Remove Retaining ring S-12.
Fig. 24 Fig. 25
*Loop handle *M5x25 Hex socket head bolt (2 pcs.)
Control lever assembly
*Clamp cover A
*Pipe clamp 24
*Pipe clamp 33
*mark: The components of
Loop handle set
Fig. 26
Shaft B complete on Pipe joint side
4x18 Tapping screw (4 pcs.)
M5x14 Hex socket head bolt (2 pcs.)
Fig. 27
Shaft B complete on Engine side
Spacer 24
Joint 24
M5x12 Hex socket head bolt
M6x25 Hex socket head bolt
Fig. 28
Pipe joint side of Shaft pipe B complete
Retaining ring S-12
Hanger set
(Hanger and M5x20 Pan head screw)
Joint end of Shaft B complete for installing the tool head
ASSEMBLING
Assemble by reversing the disassembly procedure.
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[4] DISASSEMBLY/ASSEMBLY
[4]-6. Clutch drum
DISASSEMBLING
(1) Remove Clutch case section from the engine.
(2) Remove Retaining ring S-12 with 1R004 from clutch case section.
(3) Remove Clutch drum from Clutch case section by pressing 1R247 with
Arbor press. (Fig. 29)
ASSEMBLING
(1) Put Clutch case on the table of Arbor press vertically, then press-fit
the shaft of Clutch drum into the hole of Ball bearing 6201LLU with
1R286 and Arbor press as drawn in Fig. 30.
(2) Set Retaining ring S-12 in place with 1R004.
Fig. 29
Fig. 30
Clutch drum
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Arbor press
1R247
Clutch case
1R286
Clutch case
[4] DISASSEMBLY/ASSEMBLY
[4]-7. Ignition
CHECK OF PLUG CAP
(1) Remove Plug cap from Spark plug, then detect the continuity between
Plug cap spring in Plug cap and Earth terminal of Ignition coil.
It is the normal condition when Tester shows 2.0kΩ±0.5kΩ. (Fig. 31)
(2) In case of no continuity or unstable continuity, check the connection
between Plug cap spring and Ignition coil as follows:
(A) Spray the lubricant in Plug cap, then pull out Plug cap spring
together with Ignition cable using Long-nose pliers. (Fig. 32)
(B) In case no connection or inconsistent connection, then check
the condition of Plug cap and spring. Reassemble them or replace
them if they are disorder.
(C) Insert the end of Plug cap spring into Ignition cable then return
them back to the inside of Plug cap carefully so as not to be
disconnected.
(D) Check Plug cap and spring again according to the step of (1)
to avoid poor connection causing the poor sparks of Spark plug.
Fig. 31
Fig. 32
Plug cap spring in Plug cap
Long-nose pliers
Tester
Earth terminal of Ignition coil
Flywheel
(inside of Clutch case)
Plug cap spring
Plug cap
CHECK OF SPARK PLUG
(1) Remove Plug cap with Plug cap spring, then remove Spark plug with Socket wrench
16-17 (standard equipment).
Note: When the spark area is wet with Fuel, wipe it away with a cloth and dry it by
air blow.
Fig. 33
0.6 up to 0.7mm
(2) Clean carbonized materials on Insulated part for sparking with a wire brush.
(3) Do fine adjustment of Spark plug as drawn in Fig. 33.
Leg
Insert 0.7mm thickness gauge of 1R366 to the clearance and adjust the leg of Spark plug carefully.
(4) Install Plug cap with Plug cap spring on Plug and connect the plug screw part to a metal part of Engine, then pull Starter
rope slowly. The sparks can be seen when starter rope is pulled.
(5) When the sparks can not be seen, try [CHECK OF PLUG CAP] to detect the continuity.
If required, replace Plug and recheck the sparks through the above process.
Fig. 34
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[4] DISASSEMBLY/ASSEMBLY
[4]-7. Ignition (cont.)
DISASSEMBLING OF IGNITION COIL Spacer
(2pcs.)
See Fig. 34.
(1) Remove Cylinder cover and cable from Ignition coil terminal.
(2) Loosen two M4x20 Hex socket head bolts and remove Ignition
coil from Engine.
Note: Do not lose two spacers on the bolts as the heat protection.
ASSEMBLING OF IGNITION COIL
See Fig. 35.
(1) While attaching 0.3mm thickness gauge of 1R366 to the magnet
portion of Flywheel, set Ignition coil in place.
Note: Two M4x20 Hex socket head bolts (Fig. 34) are with
threadlocker.
Therefore, when re-using them,
apply ThreeBond 1342 or Loctite 242 to the threads.
(2) After setting Ignition coil, remove the thickness gauge then turn
Flywheel by hand to check if it turns smoothly
without being stuck.
Note: Be sure to insert Spacer on M4x20 Hex socket head bolt
when fastening Ignition coil to Engine. (Fig. 34)
(3) Assemble Cylinder cover to Engine.
[4]-8. Flywheel
Earth terminal of Ignition
M4x20 Hex socket head bolt (2pcs.) coil to connect with Cable Connector of Cable
Fig. 35
Ignition coil
Flywheel
Clearance between
Flywheel and
Ignition coil: 0.3mm
DISASSEMBLING
Note: • Flywheel can be easily removed without holding the piston.
• Do not remove Spark plug as compressed air resistance has to be used for the disassembling.
• Plug cap with Plug cap spring has to be removed from Spark plug to prevent Engine from running. (Fig. 31)
(1) Turn M8 Flange nut in the center of Flywheel counterclockwise using Cordless impact driver with 13mm Socket bit.
(Fig. 36)
(2) Install 1R364 on Flywheel then screw two M6 bolts into Flywheel as drawn in Fig. 37 instead of
M6x25 shoulder hex bolts. Flywheel is removed from Engine.
Important: Screw two M6 bolts evenly.
Fig. 36 Fig. 37
1R364
Flange nut
(M8)
M6 bolts
(the components of 1R364)
ASSEMBLING
(1) Wipe off the grease and oil from Crank shaft.
(Fig. 38)
(2) Put Woodruff key 3 into Crank shaft, then align the key groove of Flywheel to the crank shaft with the key. (Fig. 38)
(3) Screw M8 Flange nut to the thread of Crank shaft by turning the nut clockwise by hand.
(4) Tighten M8 flange nut about two seconds using Cordless impact driver with 13mm socket bit.
Fig. 38
Key groove of
Flywheel’s hole
Wipe off the grease and oil from Crank shaft in advance.
Woodruff key 3
Crankshaft in cylinder block assembly)
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[4] DISASSEMBLY/ASSEMBLY
[4]-9. Recoil starter
DISASSEMBLING
(1) Remove Starter case from Engine.
(2) Pull out and cut the rope when it is still connected.
If it is impossible to cut Starter rope;
First, pull the rope one turn of Reel, then, Hook the rope with
the notch of Reel and turn the hooked rope
clockwise until Spiral spring loses the tension. (Fig. 39)
Note: Be careful. Reel is revolved by the recoil force of Spiral spring.
(3) Loosen M5x12 Tapping screw and remove Swing arm and Reel from
Starter case. (Fig. 40)
Note: Be careful when removing this screw as there is a possibility
that Spiral spring pops out.
(4) Untie the knot of the rope in Reel and remove the rope from Reel.
Fig. 39
M5x12 Tapping screw
(Set screw)
Fig. 40
Reel notch of Reel
Swing arm
M5x12
Tapping screw
(Set screw)
ASSEMBLING
(1) When Spiral spring pops out of Reel:
- Set the one end of Spiral spring in the slot outer side in the Reel.
- Rewind the spring counterclockwise toward the center of circle and
fit the spring end in the slot inside of Reel. (Fig. 41)
(2) Apply a little amount of Makita grease N No.2 to the spring.
(3) Make a knot on the new rope end and pass it through Reel and
Starter case, then, connect the other end to Starter knob. (Fig. 42)
Refer to Fig. 43 how to make a knot of the rope.
(4) Wind the rope two or three turns.
(5) While turning Reel counterclockwise, fit it into Starter case and hook
Spiral spring end on the rib inside of Starter case. (Fig. 44)
Note: This should be fixed without force.
(6) Set Collar and Swing arm in place, then secure them with M5x12
Tapping screw. (Fig. 45)
Swing arm has to be passed through the groove of Reel.
Important: In case Reel turning is not smooth after tightening M5x12
Tapping screw, Reel is not properly fixed to Starter case.
Repeat the step (5) so that Reel can revolves smoothly
even after M5x12 Tapping screw is completely tightened.
(7) Hook the rope in the notch of Reel while straining the rope, then,
turn reel counterclockwise. (Fig. 46) When the rope is removed
from the notch, the Reel winds the rope with spring recoil force.
Repeat the step until the rope slacks are cleared.
Fig. 41
Curved end of
Spiral spring
(Outer side)
Fig. 42
Fig. 43
Reel
Curved end of Spiral spring (Inside)
Approx. 10mm
Approx. 10mm
Fig. 44
Inside curved end of Spiral spring
Inside rib of
Starter case
Fig. 45
Groove of Reel to hook
Swing arm
Swing arm Collar
Fig. 46
M5x12
Tapping screw
(Set screw)
Swing arm notch of Reel
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[4] DISASSEMBLY/ASSEMBLY
[4]-10. Carburetor
DISASSEMBLING
(1) Remove Cleaner cover assembly by unscrewing M4 Thumb screw. (Fig. 47)
(2) Remove two Air cleaner elements. (Fig. 48)
(3) Remove two M5x60 Hex. socket head bolts for fastening Carburetor and Cleaner plate assembly to Insulator. (Fig. 48)
Note: Carburetor can not be removed without removing the bolts completely.
(4) Disconnect two tubes from Carburetor, then remove Carburetor.
Fig. 47 Fig. 48
M4 Thumb screw
M5x60 Hex. socket head bolts
Air cleaner elements: Be careful of
each shape and
direction.
Cleaner cover assembly
CLEANING / MAINTENANCE
Refer to Fig. 49.
(1) Remove four 3x24 Tapping screws, then separate Metering diaphragm and Metering diaphragm gasket.
Note: In case Metering diaphragm remains attached to the others in disassembling of Carburetor, be careful to remove
Metering diaphragm and gasket. It is fragile.
(2) Replace Metering diaphragm when the following problems happen:
• slackened • hardened • worn / debased
(3) Loosen M3x4 screw in Pump body to remove Inlet needle and Control lever etc.
(Refer to Fig. 50) from Carburetor.
Fig. 50
Control lever Spring
(4) Before assembling Pump body, check that the top of Inlet needle is not
deformed/ worn out. (Fig. 51).
(5) When Control lever is set in place, make sure that Spring is put properly. (Fig. 52)
(6) Regarding three M3x8 Pan head screws with washers, loosen Idling screw fully
first, and then remove them.
(7) After checking if Inlet screen is clogged with dust, fit it into Pump body.
(8) Spray carburetor cleaner each route in Carburetor and then clean it with gasoline
after a few minutes.
Fig. 49
M3x4 + screw
Fig. 51
Pin
Note:
Inlet needle
These items can not be supplied solely.
Order Pump body to replace them.
Pump body
(M3x4 screw
is included.)
Metering diaphragm gasket
Inlet
Carburetor screen
M3x8 Pan head screw with washer
(2pcs.)
(Throttle valve assembly)
Swivel
Washer
Stop ring
E-3
(Idling screw)
Normal
Fig. 52
Out of order
Metering diaphragm
Normal
Air purge body
Primer pump
Conical compression spring 5-9
O ring 2
Jet
Out of order
Pump gasket
Pump diaphragm
Primer pump cover
3x24 Tapping screw (4pcs.)
Dust in Pump body causes the leakage of pressure.
Fig. 53
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[4] DISASSEMBLY/ASSEMBLY
[4]-10. Carburetor (cont.)
ASSEMBLING
Carefully assemble each part in right direction and order.
(Nipple to connect
yellow tube of Tank)
TEST OF AIRTIGHT STRUCTURE
Connect 1R127 to the nipple of Carburetor as drawn in Fig. 53.
Give air pressure from 1R127 and check if the pressure gauge indicates
0.05Mpa for around 10 seconds, then, there is no problem with Carburetor.
ASSEMBLING TO ENGINE
Nipple of Carburetor to connect black tube of Tank
Fig. 54
(1) Assemble Cleaner plate assembly, Carburetor and Gasket to Insulator
with two M5x60 Hex socket head bolts.
(2) Connect black tube of Fuel tank to the nipple of Carburetor.
Connect yellow tube of Fuel tank to the other nipple of Carburetor.
(Figs. 53 and 54)
Connect Tube from Cylinder and Breather pipe to the Cleaner plate
assembly.
Note: Make sure that fuel tubes do not touch on Cylinder cover.
(3) Set Air cleaner elements in place. The felt element is put on the bottom,
and the sponge element is on the front.
(4) Hook the tabs of Cleaner plate assembly with the holes of Cleaner cover
assembly. (Fig. 55)
Tank
Fig. 55
Black tube
Yellow tube
1R127
Tabs of
Cleaner plate assembly
[4]-11. Stop switch
Check the continuity of two Lead wires’ ends routed from Control lever with Tester. (Fig. 56)
Fig. 56
Stop switch is in order if it works as followings:
* Circuit tester shows no connectivity
when Engine turns on.
* Circuit tester shows a connectivity
when Engine turns off.
[4]-12. Fuel tube
Assemble Tube complete (Black tube, Yellow tube and
Grommet) to Fuel tank as drawn in Fig. 57.
Assemble Gasoline filter and Hose clamp to the black tube, then put them into Fuel tank. (Fig. 58)
Fig. 57
Black tube Yellow tube
Fig. 58
Grommet
Gasoline filter
Black tube
Hose clamp
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[4] DISASSEMBLY/ASSEMBLY
[4]-13. Spark arrester (Only for some countries, i.e., having dry atmospheres at high temperature)
MAINTENANCE
(1) Remove Cylinder cover.
(2) Remove Exhaust Muffler.
(3) Remove Spark arrester from Exhaust muffler (Fig. 59).
Sweep it off if dirt or soot is on Spark arrester.
Replace it with a new one if spark arrester has a breakage or fray.
(4) Assemble Spark arrester to Exhaust muffler.
(5) Set Exhaust muffler in place.
Note: • Refer to Parts breakdown, and do not forget muffler gasket.
• Two M5x40 Hex socket head bolts on Exhaust muffler are threadlocker type.
Once removing them for repair, apply ThreeBond 1342 / Loctite 242 to
the threads to screw them.
(6) Set Cylinder cover in place.
Fig. 59
Exhaust muffler
[4]-14. Engine block
DISASSEMBLING Fig. 60
(1) Drain the oil from Engine as much as possible so that the remaining oil
is not spilled out when disassembling.
(2) Remove the following parts from Engine.
• Cylinder cover • Tank guard • Fuel tank • Clutch case
• Recoil starter assembly • Clutch • Ignition coil • Flywheel
• Rocker cover inner • Rocker cover gasket • Rocker arm assembly
• Rod 2.5 • Cam lifter • Cam gear • Insulator • Air cleaner • Carburetor
• Spark plug • Muffler
(3) Open Cylinder block by removing six M5x16 Hex socket head bolts. (Fig. 60)
(4) Remove Clips from both ends of Piston pin hole with the awl. (Fig. 61)
Note: • Be careful as the clip pops out.
• Do not reuse the removed Piston clip.
(5) Remove Piston pin by pushing it with 1R171. (Fig. 62)
(6) Piston can be now removed from Crankshaft.
Fig. 61
Piston Awl
Spark arrester
Cylinder block
Fig. 62
Piston pin hole
Clip
1R171
Piston pin
P 13/ 14
R
epair
[4] DISASSEMBLY/ASSEMBLY
[4]-14. Engine block (cont.)
ASSEMBLING
(1) Piston can be assembled in either direction.
Apply Makita grease N No. 2 to the needle bearing of Crank shaft assembly in advance.
(2) Insert Piston pin through Piston and Crank shaft, and fix it with Clips by using the awl (Clip has no direction).
(3) Piston rings have their directions and each different shapes as drawn in Fig. 63.
First, install Piston ring 34, and next, install Piston ring (second) 34, then finally install Piston ring (top) 34.
The piston ring 34 for the lowest groove on Piston consists of three part; top ring, middle ring and bottom ring.
Top ring and bottom ring have a clearance and the distance of each clearance point must have 120° angle.
Piston ring (top) 34 and Piston ring (second) 34 consist of single part and the distance between their clearances
must have 180° angle when they fixed into the grooves on the piston.
Note: Piston rings are easy to break. Do not enlarge them too much when fixed.
(4) Assemble Cylinder block assembly.
After removing grease from the matching surface of Cylinder block and Crank case (Refer to Fig. 64), apply ThreeBond
1216 on the Crank case side.
Note: The layer of ThreeBond 1216 has to be thin so as not to enter into the oil route in Engine and get clogged.
Apply 4-stroke oil to the contact surface of Piston and Cylinder.
While holding Piston rings, install the assembled part of Piston into Cylinder block.
(5) Fasten Cylinder block assembly by tighten the screws in crisscross pattern.
Fig. 63
Piston ring (top) 34
The position between two clearances must be at 180° opposite point.
Piston ring (second) 34
Piston top end
Difference of the clearance should be 120°.
Piston ring 34
Top layer
Middle layer
Piston ring (top) 34
The center is expanded.
Piston ring (second) 34
The bottom is wider than the top.
Bottom layer
Cross section of Piston
Piston ring 34 for the lowest groove on Piston consists of three layers.
The top layer and the bottom layer have a clearance as drawn above. Clearances should not be overlapped each other.
Fig. 64
Piston
The matching surface: emphasized by black color
P 14/ 14
R
epair
[4] DISASSEMBLY/ASSEMBLY
[4]-14. Engine block (cont.)
ASSEMBLING
(6) Adjust the valve clearance as follows:
• Align the marking on Flywheel with the marking on Ignition coil. (Fig. 65)
• Align the marking on Cam gear assembly with the marking on Cylinder block. (Fig. 66)
• Assemble two Cam lifters and two Rod 2.5, and then assemble two Rocker arm assembly to them.
Note: The ends of Rod 2.5 have to be put into the round depressions of Cum lifter and Rocker arm.
• Loosen the adjust screws of Rocker arm assembly, and put 0.1mm thickness gauge of 1R366 between Valves
and Rocker arms.
Then adjust the valve clearance. (Fig. 67)
• After the adjustment, tighten the nuts of Rocker arm assembly, remove 0.1mm thickness gauge of 1R366.
Fig. 65 Fig. 66 Fig. 67
Marking on Ignition coil
1R170
Marking on
Flywheel
Marking on
Cam gear assembly
Marking on
Cylinder block
1R366
[4]-15. Fastening torque
Fig. 67
Parts to fasten
CYLINDER BLOCK and CRANK CASE
CRANK CASE and RETAINER PLATE
CRANK CASE and OIL CASE
FLYWHEEL and CRANK SHAFT 1
COIL and CYLINDER BLOCK
CAM GEAR COVER and CYLINDER BLOCK
ROCKER ARM ADJUSTING SCREW and NUT
ROCKER COVER OUTER and CYLINDER BLOCK
CLUTCH and FLYWHEEL
MUFFLER and CYLINDER BLOCK
SPARK PLUG and CYLINDER BLOCK
INSULATOR and CYLINDER BLOCK
CLUTCH CASE and CYLINDER, CRANK CASE
PULLEY and CRANK SHAFT 2
RECOIL STARTER and CYLINDER, CRANK CASE
MUFFLER PLATE and CRANK CASE
OIL PIPE and OIL CASE
CASE, GEAR ASSEMBLY and PIPE SHAFT
CASE, GEAR ASSEMBLY and PIPE SHAFT
HANDLE HOLDER 2, 3 and PIPE SHAFT
CONTROL LEVER and HANDLE
BRACKET PIPE and SHAFT PIPE COMPL
BRACKET PIPE and SHAFT PIPE COMPL
CONTROL CABLE and INSULATOR
JOINT 24 and LEVER 94
JOINT 24 and PIPE SHAFT B
JOINT 24 and PIPE SHAFT B
Screw/ Nut
HEX SOCKET HEAD BOLT (M5×16)
HEX SOCKET HEAD BOLT (M4×10)
HEX SOCKET HEAD BOLT (M5×16)
FLANGE NUT (M8)
HEX SOCKET HEAD BOLT (M4×20, W, SW, MEC)
HEX SOCKET HEAD BOLT (M5×16)
NUT (M5)
HEX SOCKET HEAD BOLT (M5×16)
CLUTCH BOLT (M6×25)
HEX SOCKET HEAD BOLT (M5×40,W,MEC)
M10×P1.0
HEX SOCKET HEAD BOLT (M5×18,W,SW)
HEX SOCKET HEAD BOLT(M5×18,W,SW)
M8
HEX SOCKET HEAD BOLT (M5×16,W,SW)
HEX SOCKET HEAD BOLT (M5×14,W,SW)
HEX SOCKET HEAD BOLT (M5×14,W,SW)
HEX SOCKET HEAD BOLT (M5×25,SW)
HEX SOCKET HEAD BOLT (M5×14,SW)
HEX SOCKET HEAD BOLT (M5×30,SW)
SCREW PAN HEAD (M4x25,W,SW)
HEX SOCKET HEAD BOLT (M5×18,SW)
HEX SOCKET HEAD BOLT (M5×12,SW)
NUT (M6)
NUT (M6)
HEX SOCKET HEAD BOLT (M5×12)
HEX SOCKET HEAD BOLT (M6×25)
Fastening torque
(N·m)
6.0
8.0
11.0
5.0
5.0
6.0
5.0
5.0
5.0
3.0
6.0
16.0
4.0
6.0
6.0
6.0
9.0
5.0
5.0
2.0
7.0
7.0
7.0
6.0
2.0
4.0
4.5
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