Makita EM4350LH, EM4350UH, EM4351UH User Manual
T
ECHNICAL INFORMATION
Models No.
Description
EM4350UH, EM4350LH
EM4351UH
Petrol Brushcutter
CONCEPT AND MAIN APPLICATIONS
These models are 43.0cm³ 4-stroke petrol brushcutters developed
in compliance with well-known exhaust emission regulations.
Their main features are:
• Powerful 4-stroke engine for working in larger open area, and
for easily cutting through thick weeds and longer grass
• Newly designed throttle assembly with wide-grip throttle trigger
• Universal guard for both metal blade and nylon cutting head
• Toolless quick fastening handle holder for easy handling and
angle adjustment of handle(for EM4350UH, EM4351UH only)
• Floating structure with four rubber buffers absorbs vibration
transmitted from engine to bike handle. (for EM4351UH only)
Specification
EM4350LH
Length (L)
Width (W)
Height (H)
PRODUCT
H
W
L
EM4350UH
EM4351UH
Dimensions: mm (")
EM4350UH EM4350LH EM4351UH
1,812 (71-1/2)
635 (25) 339 (13-3/8) 618 (24-1/4)
460 (18-1/8) 528 (20-3/4)250 (9-7/8)
W
H
P 1/ 2
L
The drawing
above is
EM4350UH.
1,812 (71-1/2)
2
Specifications
Type
Displacement: cm³ (cu.in.)
Engine
Max. spindle speed at no load: min.ˉ¹ = rpm
Engine oil
Carburetor
Engine start assist
Primer pump
Clutch
Anti-vibration system
Net weight*1: kg (lbs) 7.9 (17.3)
*1 Dry weight, without universal guard, cutting tool and shoulder harness
Fuel
Max. output: kW (PS)
Max. torque: N.m
Model
in the Class SF or higher of API Classification
(Automotive 4-stroke engine oil)
(by automatic mechanical decompression valve)
Bike handle
Conventional low-vibration structure
8.3 (18.2)
EM4350LH
4-stroke
43.0 (2.6)
Straight unleaded gasoline
1.50 (2.1) at 7,500 rpm
2.1 at 5,500 rpm
7,200
SAE10W-30 oil
Diaphragm
Yes
Yes
Yes
0.62 (21.0)Fuel tank capacity: L (US oz)
M10x1.25, Left-handedSpindle thread size
Loop handleHandle style
EM4351UHEM4350UH
Bike handle
Floating structure
8.6 (18.9)
Standard equipment
Blade or Nylon cutting head ..................... 1
Universal guard (=Protector) .................... 1
Blade cover ............................................... 1 (for the model with blade)
Double shoulder straps with waist pad ..... 1 (for EM4350UH)
Double shoulder straps with waist pad
for Loop handle model...... 1 (for EM4350LH)
Double shoulder straps with waist belt ..... 1 (for EM4351UH)
Note: The standard equipment for the tool shown above may vary by country.
Tool set (Hex wrench 4, Hex wrench 5,
Socket wrench 16-17,
Socket driver 16-10) .................. 1
Accessory bag ............................................ 1
Oil bottle without oil or
Oil bottle containing 100mL engine oil ..... 1
Optional accessories
255mm Triple blade, 300mmTriple blade, 255mm Star blade, 200mm Chisel blade, 225mm Chisel blade,
Nylon cutting heads (UltraAuto 6), Protector, Protector extension, Protector 200 set, Protector 225 set,
Double shoulder straps, Oil bottle
P 2/ 22
Repair
CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.
[1] NECESSARY REPAIRING TOOLS
DescriptionCode No. Use for
---
---
---
1R219
Retaining ring pliers ST-2 for External ring1R004
Retaining ring pliers RT-2N for Internal ring1R005 removing/ installing Cotter by using 1R389
Retaining ring pliers RT-2E for Internal ring1R006 removing/ installing Retaining rings
Bearing setting pipe 20-12.21R028
Bearing setting pipe 28-20.21R031
Air density tester1R127 diagnosing Carburetor
Round bar for arbor 20-1001R247 removing Clutch drum complete from Clutch case
Round bar for arbor 8-501R282
Round bar for arbor 12-501R286 press-fitting Clutch drum complete into Clutch case
Retaining ring S and R pliers1R291 removing/ installing Retaining rings
Flywheel puller1R364 removing Flywheel
Feeler gauge set1R366 adjusting Ignition coil, Spark plug
Cotter removal attachment1R389 removing/ installing Cotter by using 1R005
10mm Hex socket bit
14mm Hex socket bit
Wire brush
Torque wrench shaft 7-23N.m
Torque wrench shaft 2-6N.m1R254
removing/ installing Retaining rings
press-fitting Cutter shaft set into Ball bearing 6000DDU
removing Spiral bevel gear 14 from Ball bearing 609ZZ
press-fitting Clutch drum into Ball bearing 6004LLU/6003LLU
removing Ball bearing 6000DDU from Cutter shaft completeBearing setting plate 10.21R033
removing Ball bearingsGear extractor (Large)1R045
removing Spiral bevel gear 14 from Ball bearing 6000ZZ and
6000
removing Piston pin
removing/ installing Flywheel
removing/ installing Clutch
cleaning Spark plug
tightening Bolts to specified torque
[2] HANDLING OF GASKET
Once Gasket is removed:
(1) Clean up the mating surface where the gasket was installed to maintain its sealing performance.
(2) Replace it with a new one.
[3] LUBRICANT / ADHESIVE APPLICATION
(1) Apply a little amount of Makita grease N No. 2 to Spiral spring in Recoil starter and the spline ends of Shaft in
Shaft pipe complete.
(2) When the inside of Gear case is cleaned, supply 11g of Makita grease N No. 2 from the grease inlet.
(3) Apply 4g of Makita grease N No. 1 to the entire portion of Shaft in Shaft pipe complete.
(4) Once Engine is disassembled, remove oil/grease from the mating surface of Cylinder and Crankcase complete,
then apply ThreeBond 1215/1216 to the mating surface for the reassembly.
[4] DISASSEMBLY/ASSEMBLY
[4]-1. Warning
Follow the instructions described below in advance before repairing:
• Wear gloves.
• Remove the cutting tool from the unit, and if it is a saw blade, attach the blade cover to the blade.
• When the engine is hot from use, cool down the engine enough or you can get burned.
• Remove remaining fuel from Fuel tank and Carburetor completely. [FLAMMABLE MATERIAL KEEP FIRE AWAY]
• Remove Spark plug cap from Spark plug.
• Repair the engine on a stable workbench and in a clean workplace kept as free of dust and debris as possible.
• In order to avoid wrong reassembly, draw or write down where and how the parts are assembled, and what are the parts.
It is also recommended to have boxes ready to keep disassembled parts by group.
• Handle the disassembled parts carefully. Clean and wash them properly.
• If some bolts and screws are too tight, use an impact driver.
• Tighten the bolts and the screws to the specified torque as shown in "[4]-15. Tightening torque specifications".
• Each time after you mounted a main part of the engine such as the piston, check if it moves smoothly
without abnormal noise by manually turning the crankshaft.
• After completion of reassembly, check for loose parts or abnormal noise and vibration
by manually turning the crankshaft.
P 3/ 22
Repair
[4] DISASSEMBLY/ASSEMBLY
[4]-2. Engine and Shaft
(1) Press down the tab of Cleaner plate assembly gently and separate Cleaner cover assembly from Cleaner plate assembly
by loosening M5x20 Hex socket head bolt. (Fig. 1)
(2) Loosen 5x16 Tapping screw and loosen Clamp that holds Bullet terminals near Cleaner plate assembly. (Fig. 2)
(3) Disconnect Bullet terminals of Earth wire and Primary wire of Ignition coil from the wires of Stop switch. (Fig. 2)
(4) Remove Control cable from Swivel of Carburetor; loosen the three nuts on Control cable to release the tension
between Swivel and Cable bracket of Insulator, then remove the stopper on Inner cable end from Swivel. (Fig. 3)
(5) For EM4351UH: Remove M5x8 Hex socket head bolt and M6x30 Hex socket head bolt in the holes of Pipe housing.
(Fig. 4)
For EM4350UH and EM4350LH: Remove M5x8 Hex socket head bolt and M6x30 Hex socket head bolt from
the threaded holes of Clutch case. (Fig. 5)
(6) Grab Shaft pipe complete by hand, then pull it off from Clutch case.
If Shaft sticks in Clutch case, use water pump pliers or the like to pull it off.
Note: Be sure to wrap Shaft with a rag or the like to protect it from water pump pliers. (Fig. 6)
Fig. 1
Fig. 2
M5x20 Hex socket
head bolt
Inner cable
Clamp
Control cable
Cleaner cover
assembly
Fig. 3 Fig. 4
Stopper on Inner cable end
Cable bracket of Insulator
Nut on Control cable end
(3 pcs.)
Cleaner plate assembly
Tab of
Swivel of Carburetor
5x16
Tapping
screw
Holes of
Pipe housing
M5x8
Hex socket
head bolt
M6x20
Hex socket
head bolt
Cleaner plate assemblySwivel of Carburetor
Bullet terminals
Fig. 5 Fig. 6
M5x8 Hex socket
head bolt
Threaded holes
of Clutch case
M6x20 Hex
socket head bolt
Shaft pipe complete
ShaftRag
Water pump
pliers
P 4/ 22
Repair
[4] DISASSEMBLY/ASSEMBLY
[4]-2. Engine and Shaft (cont.)
ASSEMBLING
Assemble by reversing the disassembly procedure.
(1) Put Cable bracket between Flat washer 6 and middle Nut, and tighten them by turning lower nut, upper nut and
the middle nut. (Fig. 7)
(2) Put Stopper on Inner cable end into Swivel, then adjust the above nuts so that 3mm to 4mm of play is left inside of
Swivel under condition that Throttle lever is not pulled. (Fig. 7)
Note: Adjust the tension of Inner cable to prevent the stopper from being removed . (Fig. 7)
Fig. 7
Stopper on Inner cable end
Cable bracket of Insulator
complete
Nut (upper)
Nut (middle)
Flat washer 6
Nut (lower)
Play: 3mm to 4mm
Swivel
[4]-3. Shaft pipe complete
DISASSEMBLING
(1) Loosen two M6x30 Hex. socket head bolt (2pcs.) and remove Protector with Protector extension attached. (Fig. 8)
(2) Enlarge the space between the side wall of Protector cover and M5x14 Hex socket head bolt, and remove Protector cover
from Shaft pipe complete. (Fig. 9)
(3) Remove two M5x14 Hex socket head bolts then remove Protector clamp.
(4) Loosen M6x30 Hex socket head bolt then remove Gear case assembly. (Fig. 10)
Fig. 8
M6x30 Hex. socket
head bolt (2 pcs.)
Fig. 9
M5x14 Hex socket head bolt (2 pcs.)
Shaft pipe
complete
Protector
Protector extension
Fig. 10
M6x30 Hex
socket head bolt
Protector clamp
The side wall of
Protector cover
Gear case assembly
M5x14 Hex socket
head bolt (2 pcs.)
Gear case
assembly
P 5/ 22
Repair
[4] DISASSEMBLY/ASSEMBLY
[4]-3. Shaft pipe complete (cont.)
DISASSEMBLING
For 4351UH:
(5A) Loosen M5x18 Hex socket head bolt and remove Shaft pipe complete from Pipe housing. (Fig. 11)
(6A) Pull out Shaft from Shaft pipe complete.
For 4350UH:
(5B) Remove two M6x25 Hex socket head bolts and Pipe clamp, then separate Bike handle section from Shaft pipe
complete. (Fig. 12)
(6B) Remove the following parts from Shaft pipe complete.
• Wire clamp (2 pcs.) • Hanger set • Shaft (Fig. 13)
For 4350LH:
(5C) Remove four M5x30 Hex socket head screws, then remove Handle clamp 28 and then remove Loop handle 28.
(Fig. 14)
(6C) Loosen two M5x14 Hex socket head bolts, then separate Lever case set from Pipe shaft complete. (Fig. 15)
(7C) Remove the following parts from Pipe shaft complete.
• Hanger set • Spacer • Shaft
Fig. 11
Pipe housing
M5x18 Hex socket head bolt
Fig. 13 Fig. 14 Fig. 15
Shaft
Wire clamp (2 pcs.)
Shaft pipe
Fig. 12
Pipe clamp
M5x30 Hex socket
head screw (4 pcs.)
Loop handle 28
Bike handle section
Shaft pipe complete
M6x25 Hex
socket head bolt
Control lever assembly
Shaft pipe
complete
Hanger set
Handle clamp 28
Shaft pipe
complete
M5x14 Hex socket
head bolt (2 pcs.)
Repair
[4] DISASSEMBLY/ASSEMBLY
[4]-3. Shaft pipe complete (cont.)
ASSEMBLING
For 4351UH:
(1A) Insert Buffer rubber into Pipe housing so as to align the two grooves
with the two ribs (Fig. 16) Set the four Buffer rubbers in place of
Pipe housing. (Fig. 17)
(2A) Insert two projections of Clutch case into Buffer rubbers.
Insert two projections of Housing holder into the other Buffer rubbers,
then tighten M5x18 Hex socket head bolt while holding Housing
holder by hand. (Fig. 17)
Note: Make sure that Corrugate tube is put in the groove of Pipe housing.
(Fig. 18)
(3A) Assemble by reversing the disassembly procedure.
For 4350UH and 4350LH:
Assemble by reversing the disassembly procedure.
Fig. 17
P 6/ 22
Fig. 16
Ribs of Pipe housing
Grooves of
Buffer rubber
Projections of Clutch case
Fig. 18
Pipe housing
Buffer rubber (4 pcs.) Housing holder
Groove of Pipe housing
Corrugate tube
P 7/ 22
Repair
[4] DISASSEMBLY/ASSEMBLY
[4]-4. Gear case assembly
DISASSEMBLING
(1) According to the clause of [4]-3, Remove Gear case assembly. (Refer to Figs. 8, 9 and 10)
(2) Remove M8x10 + Hex bolt from the grease inlet of Gear case assembly. (Fig. 19)
(3) Remove Retaining ring R-26 with 1R006. (Fig. 20)
(4) Remove an assembled part of Spiral bevel gear 13*, Ball bearing 6000ZZ, Ball bearing 6000 and Retaining ring S-10
by tapping Gear case assembly with Plastic hammer. (Fig. 21)
Note: If the assembled part cannot be removed, use a heat gun or hair dryer to warm Gear case assembly.
(5) Remove Retaining ring S-10 with 1R291. (Fig. 21)
(6) Receive Ball bearing 6000 with 1R031, then press down the shaft end of Spiral bevel gear 13 using 1R282 with
Arbor press. (Fig. 22) Refer to Fig. 23 for the components.
(7) Remove Retaining ring R-32 with 1R291. (Fig. 24)
(8) Preset Receive washer and 1R033 with M10-17 Hex nut to Cutter shaft complete* as drawn in Fig. 25, and give
the impacts using the plastic hammer. An assembled part of Cutter shaft complete* and Ball bearing 6201LLU is
removed. Refer to Fig. 26 for the components.
(9) Remove Ball bearing 6201LLU with 1R045.
*Neither Spiral bevel gear 13 or Cutter shaft set is supplied individually. It is supplied as a set “Cutter shaft set”.
Fig. 19
Fig. 21 Fig. 22
Arbor press
M8x10
+ Hex bolt
Fig. 20
Retaining ring R-26
Fig. 23
Ball bearing 6000
Ball bearing 6000ZZ
Retaining ring S-10
Retaining ring R-26
It was removed by the previous step (3).
Fig. 25 Fig. 26
Assembled part
Retaining ring S-10
1R282
Ball bearing
6000ZZ
Ball bearing
6000
1R031
Spiral bevel
gear 13*
Fig. 24
M8x10
+ Hex bolt
Spiral bevel gear 13*
Retaining
ring R-32
M10-17
Hex nut
1R033
Receive
washer
Gear case
assembly
Cutter shaft complete*
Ball bearing 6201LLU
Retaining ring R-32
It was removed by the previous step (7).
O ring 32
Ball bearing 629ZZ
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