TECHNICAL INFORMATION
PRODUCT P 1/ 15
Models No. |
RBC411U |
Description |
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.
H 
W
L
Its other features are: |
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Dimensions: mm (") |
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• Symmetric design handle bar |
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Length (L) |
1,710 (67-1/2) |
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• Ergonomic grip for higher maneuverability |
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Width (W) |
670 (26-3/8) |
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Height (H) |
430 (17) |
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Specification
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Type |
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2-stroke |
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Displacement: cm³ |
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40.2 |
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Engine |
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Fuel |
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Mixed gasoline |
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Max. output: kW (PS) |
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1.4 (2.0) [at 7,000 min.ˉ¹] |
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Max. torque: N.m |
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2.2 [at 5,000 min.ˉ¹] |
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Max. speed at no load: min.ˉ¹ = rpm |
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10,000 |
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Max. spindle speed at no load: min.ˉ¹ = rpm |
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6,800 |
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Compliance with main exhaust |
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emission regulations; CARB Tier 3, |
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No |
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EPA Phase 2, EU Stage 2 |
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Carburetor |
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Float type |
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Starting |
Rapid start |
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No |
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system |
(Spring-assisted recoil starter) |
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Decompression valve |
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No |
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Starting system |
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Recoil starter |
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Fuel tank capacity: L |
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1.1 |
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Primer pump |
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No |
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Spindle thread size |
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M10x1.25, Left-handed |
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Handle style |
Symmetric design bike handle |
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Net weight*: kg (lbs) |
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7.3 (16) |
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* Dry weight, without guard, cutting tool and shoulder harness |
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Standard equipment |
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Double blade 305mm (12") ................................................................ |
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1 |
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Tool kit |
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(inc. Socket wrench 17-19, Hex wrench 4 and Hex wrench 5) .......... |
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Shoulder harness with double shoulder straps .................................... |
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1 |
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Accessory bag ..................................................................................... |
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1 |
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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
P 2/ 15
Repair
CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”. [1] NECESSARY REPAIRING TOOLS
Code No. |
Description |
Use for |
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1R004 |
Retaining ring pliers ST-2 for External ring |
removing/ assembling Retaining rings |
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1R006 |
Retaining ring pliers RT-2E for Internal ring |
removing/ assembling Retaining rings |
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1R022 |
Bearing plate |
removing Clutch drum complete from Ball bearing 6003LLU |
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1R023 |
Pipe ring |
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1R028 |
Bearing setting pipe 20-12.2 |
assembling Ball bearing 6003LLU to Clutch drum complete |
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1R127 |
Air density tester |
diagnosing Carburetor |
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1R155 |
Crank shaft lock bolt |
locking Piston (with Crank shaft) |
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1R200 |
Piston pin punch |
removing Piston pin |
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1R219 |
Torque wrench shaft 7-23N·m |
tightening Bolts |
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1R220 |
Ratchet head 9.5 (for 1R219) |
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1R269 |
Bearing extractor |
removing Ball bearings |
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1R311 |
Retaining ring pliers with Long bent nails |
removing Fuel tube from nipple of Carburetor |
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removing Retaining rings R-26 and R-32 in Gear case assembly |
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1R364 |
Flywheel puller |
removing Flywheel |
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1R366 |
Feeler gauge set |
adjusting Ignition coil/ Spark plug |
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Wire brush |
making Spark plug clean |
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[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.
P 3/ 15
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 |
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Clutch case complete |
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M6x22 Hex |
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socket head bolt |
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Bullet terminals |
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of Lead wires |
Earth terminal |
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Carburetor |
Fig. 2 |
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Control cable |
Mixing cap |
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Piston valve |
The end of |
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Control cable |
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Spring |
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Fig. 3
M6x22 Hex 
socket head bolt 
(3 pcs.) 
Clutch case complete
ASSEMBLING Assemble by reversing the disassembly procedure.
[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 |
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M6x30 Hex |
Shaft pipe complete |
Protector clamp |
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socket head |
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screw (2 pcs.): A |
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M5x14 Hex |
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socket head |
Protector |
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screw (2 pcs.) |
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Gear case assembly |
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M6x30 Hex socket head bolt: B |
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ASSEMBLING |
Assemble by reversing the disassembly procedure. |
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Fig. 5
Shaft pipe complete
M6x30 Hex socket head bolt (2 pcs.)
P 4/ 15
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.
Fig. 8
Fig. 6
Groove in Gear |
case assembly |
Retaining ring |
R-26 |
Fig. 7
M8x10 |
+ Hex bolt |
Fig. 9
Ball bearing 6000 |
Spiral bevel gear 13* (The component of Cutter shaft set) |
Groove in Gear |
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case assembly |
Ball bearing
6000ZZ 
Retaining 
ring R-32
Retaining ring S-10
Fig. 10
Ball bearing 629ZZ Cutter shaft complete**
(The component of Cutter shaft set)
Ball bearing 6201DDU
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 |
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Arbor press |
Ball bearing |
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6201DDU |
1R031 |
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Cutter shaft complete |
Ball bearing |
Gear case assembly |
629ZZ |
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U-shape table |
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of Arbor press |
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P 5/ 15
Repair
[4] DISASSEMBLY/ ASSEMBLY [4]-5. Control lever assembly
ASSEMBLING |
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See Fig. 12. |
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(1) Hook Control cable to Throttle lever. |
Fig. 12 |
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Assemble Switch lever and Leaf spring to Switch cover. |
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Torsion spring 11 |
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(2) Assemble Throttle lever, Lock off lever and Switch cover to |
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Switch cover |
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Lever case L in order while setting the following parts in place: |
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• Torsion spring 11 to Throttle lever |
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• Torsion spring 7 to Lock off lever |
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(3) Fix Control cable with Cable holder when setting Control |
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cable in place as drawn in Fig. 13. |
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Fig. 13 |
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Throttle lever |
Switch lever |
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Lever case L |
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Control cable |
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Cable holder |
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Torsion |
Lock off lever |
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spring 7 |
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[4]-6. Clutch
DISASSEMBLING
Note: • Clutch can be easily removed with Impact driver without holding the piston.
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• Do not remove Spark plug as compressed air resistance has to be used for the disassembling. |
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• Plug cap with Plug cap spring has to be removed from Spark plug. |
Fig. 14 |
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(1) |
Remove the clutch section by unscrewing two M8 shoulder hex bolts. |
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Then, remove M6x14 Hex head bolt with Impact driver. (Fig. 13) |
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(2) |
Install 1R364 on Holder then screw two bolts into Holder as drawn in Fig. 14 |
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instead of M8 Shoulder hex bolts. Holder is removed from Engine. |
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Fig. 13 |
1R364 |
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M8 Shoulder hex bolt (2pcs.)
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Clutch section |
Holder |
M6x14 Hex head bolt |
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M8 bolts |
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(the components of 1R364) |
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 “
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(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 |
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Fig. 16 |
M8 Shoulder hex bolt |
Fig. 15A |
M6x14 Hex head bolt |
marking of “ ” |
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Wave washers 10 |
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Clutch section |
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Spring lock washer |
Flat washers 6 |
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Flat washer |
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Holder |
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