Makita RBC411U User manual

T

ECHNICAL INFORMATION

PRODUCT

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Models No.

Description

RBC411U

Petrol Brushcutter

CONCEPT AND MAIN APPLICATIONS

Model RBC411U is Petrol brushcutter developed based on Model RBC411
powered by 40.2 cm³ 2-stroke engine; therefore, the engine for this model is not
complied with well-known exhaust emission regulations.
The development concept of this model is to increase maneuverability, while
providing a cost advantage with newly designed Shaft section.

Its other features are:

• Symmetric design handle bar

• Ergonomic grip for higher maneuverability

Specification

Displacement: cm³

Engine

Compliance with main exhaust
emission regulations; CARB Tier 3,
EPA Phase 2, EU Stage 2

Carburetor

Starting
system

Starting system Recoil starter

Fuel tank capacity: L

Primer pump No

Spindle thread size

Handle style

Net weight*: kg (lbs)

Fuel
Max. output: kW (PS) 1.4 (2.0) [at 7,000 min.

Max. torque: N.m

ˉ¹ = rpm

Rapid start

(Spring-assisted recoil starter)

Decompression valve

Mixed gasoline

2.2 [at 5,000 min.

M10x1.25, Left-handed

Symmetric design bike handle

2-strokeType

40.2

10,000Max. speed at no load: min.ˉ¹ = rpm

6,800Max. spindle speed at no load: min.

No

Float type

No

No

1.1

7.3 (16)

H

W

Dimensions: mm (")

Length (L) 1,710 (67-1/2)

Width (W)

Height (H)

ˉ¹]

ˉ¹]

670 (26-3/8)

L

430 (17)

* Dry weight, without guard, cutting tool and shoulder harness

Standard equipment

Double blade 305mm (12") ................................................................ 1

Tool kit

(inc. Socket wrench 17-19, Hex wrench 4 and Hex wrench 5) .......... 1

Shoulder harness with double shoulder straps .................................... 1

Accessory bag ..................................................................................... 1

Note: The standard equipment for the tool shown above may vary by country.

Optional accessories

Triple blade 255mm (10"), Triple blade 305mm (12"), Star blade 230mm (9"), Star blade 255mm (10"),
Double blade 305mm (12"), Eddy blade (8-tooth blade) 230mm (9"), Eddy blade (8-tooth blade) 255mm (10"),
Saw blade 230mm (9"), Saw blade 255mm (10"), Nylon cutting head (Bump & Feed Z5L),
Nylon cutting head (Ultra Auto 6L), Protector (for cutting blade only), Universal guard (=Protector),
Universal guard extension

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Repair

CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.

[1] NECESSARY REPAIRING TOOLS

DescriptionCode No. Use for

Retaining ring pliers ST-2 for External ring1R004 removing/ assembling Retaining rings

Retaining ring pliers RT-2E for Internal ring1R006

Bearing plate1R022

Pipe ring1R023

Air density tester1R127 diagnosing Carburetor

Crank shaft lock bolt1R155

1R219

1R269

1R311 Retaining ring pliers with Long bent nails

Torque wrench shaft 7-23N·m

Ratchet head 9.5 (for 1R219)1R220

Bearing extractor

Flywheel puller1R364 removing Flywheel
Feeler gauge set1R366 adjusting Ignition coil/ Spark plug

Wire brush making Spark plug clean

removing/ assembling Retaining rings

removing Clutch drum complete from Ball bearing 6003LLU

assembling Ball bearing 6003LLU to Clutch drum completeBearing setting pipe 20-12.21R028

locking Piston (with Crank shaft)

removing Piston pinPiston pin punch1R200

tightening Bolts

removing Ball bearings

removing Fuel tube from nipple of Carburetor

removing Retaining rings R-26 and R-32 in Gear case assembly

[2] GASKET

Once Gasket is removed:
(1) Replace Gasket with a new one.
(2) Clean up the mating surface where the gasket was installed to maintain its sealing performance.

[3] LUBRICANT/ ADHESIVE APPLICATION

(1) Apply 1g of Makita grease N No. 2 to Spiral spring in Recoil starter.
(2) When the inside of Gear case assembly is cleaned, supply 11g of Makita grease N No. 2 from the grease inlet.
(3) Apply 6g of Makita grease N No. 1 to the entire portion of Shaft complete in Shaft pipe complete.

[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 Impact driver.

• Tighten the bolts and the screws to the specified torque as shown in "[5] 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.

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-2. Engine and Shaft

DISASSEMBLING

(1) Remove M6x22 Hex socket head bolt that fastens Earth terminal to Clutch case complete.
Disconnect Bullet terminals of Lead wires. (Fig. 1)
(2) Loosen Mixing cap of Carburetor, then remove Piston valve from Carburetor. Push Piston valve against
the spring force to separate the cable end from Piston valve. (Fig. 2)
(3) Remove the rest of M6x22 Hex socket head bolts to separate Engine from Clutch case. (Fig. 3)

Fig. 1

Clutch case complete

M6x22 Hex
socket head bolt

Bullet terminals
of Lead wires

Earth terminal

Carburetor

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Fig. 2 Fig. 3

Control cable

ASSEMBLING

Assemble by reversing the disassembly procedure.

Mixing cap

Piston valve The end of

Control cable

Spring

M6x22 Hex
socket head bolt
(3 pcs.)

[4]-3. Protector assembly, Bike handle

DISASSEMBLING

(1) Remove two M6x30 Hex head bolts (A) and Protector. (Fig. 4)
(2) Loosen M6x30 Hex socket head bolt (B) on the neck of
Gear case assembly, and then remove two M5x14 Hex socket
head screws.
Pull out Gear case assembly from the end of Shaft pipe complete.
(3) Remove two M6x30 Hex socket head bolts to separate Handle
section from Shaft pipe complete. (Fig. 5)

Fig. 4

M6x30 Hex

Shaft pipe complete

socket head
screw (2 pcs.): A

Protector

M6x30 Hex socket head bolt: B

Protector clamp

M5x14 Hex
socket head
screw (2 pcs.)

Gear case assembly

Fig. 5

Shaft pipe
complete

Clutch case complete

M6x30 Hex
socket head
bolt (2 pcs.)

ASSEMBLING

Assemble by reversing the disassembly procedure.

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-4. Gear case assembly

DISASSEMBLING

(1) Remove Gear case assembly from Pipe shaft complete. (see Fig. 4)
(2) Remove Retaining ring R-26 from the groove in Gear case assembly with
1R311. (Fig. 6)
(3) Remove M8x10 + Hex bolt that is the stopper of Grease inlet on Gear case
assembly. (Fig. 7)
(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. 8)
(5) Remove Retaining ring R-32 from the groove in Gear case assembly with
1R311. (Fig. 9)
(6) Remove an assembled part of Ball bearing 629ZZ, Cutter shaft complete**
and Ball bearing 6201DDU from Gear case assembly. (Fig. 10)
Note: • When it is difficult to remove the assembled part from Gear case
assembly, heat up Gear case assembly with heat gun or like and then
try the step (5)/ (6) again.

• Spiral bevel gear 13* and Cutter shaft complete** cannot be supplied
individually. Order “Cutter shaft set” from us.
(7) Disassemble their assembled parts by using 1R269 and Arbor press.

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Fig. 6

Groove in Gear
case assembly

Retaining ring
R-26

Fig. 7

M8x10
+ Hex bolt

Fig. 8

Ball bearing 6000

Ball bearing
6000ZZ

Retaining
ring S-10

Fig. 10

Spiral bevel gear 13* (The component of Cutter shaft set)

Ball bearing 629ZZ

Cutter shaft complete**
(The component of Cutter shaft set)

Ball bearing 6201DDU

Fig. 9

Groove in Gear
case assembly

Retaining
ring R-32

ASSEMBLING

Assemble by reversing the disassembly procedure.

Note: • Receive Gear case assembly with the U-shape table of

Arbor press, then press down Ball bearing 6201DDU
with 1R031 to set Cutter shaft complete in place.
(Fig. 11)

• Ball bearing 6000ZZ must be close to Retaining ring

S-10. (See Fig. 8)

• When the gear room is cleaned up, apply 11g Makita
grease N No.2 into Gear case assembly from the grease
inlet. (See Fig. 7)

Fig. 11

Arbor press

Cutter shaft complete

Gear case assembly

U-shape table
of Arbor press

Ball bearing
6201DDU

1R031

Ball bearing
629ZZ

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-5. Control lever assembly

ASSEMBLING

See Fig. 12.
(1) Hook Control cable to Throttle lever.
Assemble Switch lever and Leaf spring to Switch cover.
(2) Assemble Throttle lever, Lock off lever and Switch cover to
Lever case L in order while setting the following parts in place:

• Torsion spring 11 to Throttle lever

• Torsion spring 7 to Lock off lever

(3) Fix Control cable with Cable holder when setting Control
cable in place as drawn in Fig. 13.

Fig. 13

Fig. 12

Lever
case L

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Torsion spring 11

Switch cover

Throttle lever

Lever case L

Cable holder

Torsion

spring 7

Control cable

Lock off lever

[4]-6. Clutch

DISASSEMBLING

Note: • Clutch can be easily removed with Impact driver 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.
(1) Remove the clutch section by unscrewing two M8 shoulder hex bolts.
Then, remove M6x14 Hex head bolt with Impact driver. (Fig. 13)
(2) Install 1R364 on Holder then screw two bolts into Holder as drawn in Fig. 14

instead of M8 Shoulder hex bolts. Holder is removed from Engine.

Fig. 13

M8 Shoulder hex bolt (2pcs.)

Clutch section

M6x14 Hex head bolt

Fig. 14

1R364

M8 bolts
(the components of 1R364)

Switch lever

Holder

ASSEMBLING

(1) After putting the clutch section (two Clutch shoes and two Springs), two Wave washers 10 and two Flat washers 6
on Holder, tighten them with two M8 shoulder hex bolts. (Fig. 15)
Note: Face the marking of “ ” to the outside as drawn in Fig. 15A.
(2) Put the assembled part, Flat washer, Spring lock washer and M6x14 Hex head bolt on the crank shaft of Engine,
then tighten the bolt to 12 N·m with 1R219, 1R220 while inserting 1R155 into Spark plug hole to lock Piston
to prevent the rotation of the crank shaft. (Fig. 16)

Fig. 15

M8 Shoulder hex bolt

Wave washers 10

Clutch section

Flat washers 6

Holder

Fig. 15A

marking of “ ”

Fig. 16

M6x14 Hex head bolt

Spring lock washer

Flat washer