Makita EB7650TH Manual

Models EB7650TH/ EB7650THG/ EB7650WH arePetrol blowers equipped with
75.6cm³ 4-stroke engine in compliance with strict exhaust emission regulations.
These products are ideal for professional use with the following features:
• Higher air speed and larger air volume than our current model BBX7600
for excellent operation efficiency
• 4 damper springs mounted betweenthe engine and the backpack frame
that reduce vibration on the back of operator even during long hours
of operation to reduce operator stress and fatigue
• Cushioning back padding and shoulder straps well-ventilated for effective
sweat evaporation to providemore comfort
Model EB7650TH features tube-mounted throttle while EB7650WH features
hip-mounted throttle. Model EB7650THG is E25 compatible.
Dimensions: mm (“)
Length (L)
332 (13-1/8)
Width 1 (W1)
460 (18-1/8)
Width 2 (W2)
510 (20)
Height (H)
480 (18-7/8)
Model
Specification
EB7650TH/EB7650THG EB7650WH
Engine
Type
4-stroke, single-cylinder, air-cooled
(Makita EH075F1)
Displacement: cm³ (cu.in)
75.6 (4.6)
Fuel
Straightunleaded gasoline*1 (E0 to E10*2)
Max output: kW (PS)
2.7 (3.7) [at 7,000 minˉ¹]
Max torque: N.m
4.4 [at 5,000 minˉ¹]
Speed: minˉ¹ = rpm
at max output power
7,100
at no load
2,800
Engine oil
SAE10W-30,
Class SF or higher ofAPI Classification
(4-stroke engine oil for automobile)
Carburetor
Diaphragm
Starting
system
Easy start (Spring-assisted recoil starter)
No
Decompression valve
Yes
Spark plug
NGK CMR6A
Primer pump
Yes
Fuel tankcapacity: L(US oz)
1.9 (64)
Throttle location
Tube-mounted
Hip-mounted
Max air
speed:
m/s*3
Long pipe 90
End nozzle 90-60
89 (200)
End nozzle 90-70
81 (181)
Short pipe 90
End nozzle 90-60
90 (201)
End nozzle 90-70
81 (182)
Max air
volume:
m³/min*3
Long pipe 90
End nozzle 90-60
17 (607)
End nozzle 90-70
19 (682)
Short pipe 90
End nozzle 90-60
17 (611)
End nozzle 90-70
19 (682)
Dry weight: kg (lbs)
10.8 (23.8)
11.0 (24.3)
*1 "Straight" means "not mixed with engine oil". *2 EB7650THG: E25 *3Actual measured value
Oil bottle set*4 Flexible pipe End nozzle 90-60 Long pipe 90
Box wrench 16 Swivel pipe End nozzle 90-70
Driver Hose clamp Flat nozzle 90
*4 Withengine oil contained for some countries.
Note: The standard equipment may vary by country or model variation.
Short pipe 90 Hip belt set
T
ECHNICALINFORMATION
July 2015
OFFICIALUSE
forASC & Sales Shop
P1 /35
PRODUCT
EB7650TH/ EB7650THG/ EB7650WH
Petrol Blower
CONCEPTAND MAINAPPLICATIONS
Model No.
Description
S
pecification
S
tandard equipment
O
ptional accessories
EB7650TH/
EB7650THG
EB7650WH

P 2/ 35
Repair
CAUTION: Repairthe machine in accordance with “Instruction manual” or “Safety instructions”.
Index
[1] NECESSARYREPAIRINGTOOLS P 2
[2] GASKETSAND LUBRICATION P 3
[3] DISASSEMBLY/ASSEMBLY P 4-28
[3]-1. Warning P 4
[3]-2. Blower Section (Band CompletesL and R, Frame and Fan) P 4-9
[3]-3. Throttle Lever Section P10-12
[3]-4. Engine Section (RockerArm, Valve Portion, and Camgear Portion) P 13-17
[3]-5.AirCleaner Case P 17
[3]-6. Carburetor P 18-20
[3]-7. Flywheel P 21
[3]-8. Ignition System P 21-22
[3]-9. Crankcase P 23-27
[3]-10. Completion Inspection Check Points P 28
[1] NECESSARYREPAIRINGTOOLS
Code No. Description Use for
1R005 Retaining ring pliers RT-2N Attaching/removing Cotter (used together with 1R389)
1R070 Tachometer Engine speed check
1R181 Ignition checker Diagnosis of Ignition coil
1R229 1/4”hex. Shank bit for M5 Loosening/tightening M5 Hex socket head bolts
1R288 Screwdriver magnetizer Attaching/removing Cotter
1R306 Ring spring removing jig Attaching/removing Cotter
1R311 Retaining ring pliers Removing/inserting tubes
1R364 Flywheel puller Removing Flywheel
1R366 Feeler gauge set Adjusting gaps of Spark plug, Rocker arm, and Ignition coil
1R389 Cotter removal attachment Attaching/removing Cotter (used together with 1R005)
1R402-A Digital tester Diagnosis of Ignition coil
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[2] GASKETSAND LUBRICATION
・After removing the gaskets, completely remove any residue.
・When reassembling, replace the gaskets with new ones.
・Use parts cleaner orthe like to remove grease fromthe mating surface of Cylinder and Crankcase and then applyLiquid gasket
ThreeBond 1215 as drawn below
.
・Apply a small amount of 4-stroke engine oil to each part indicated by in the following diagrams when assembling the parts.
・Apply Makita grease NNo.2 to the sealing lips of Oil sealsand outer circumference of O rings 17 and 20 of the anti-icing valve portion
indicated by .
・Apply Makita grease N No.2 tothe outer circumference of the O ring of Elbow.
・When attaching Flywheel, use partscleaner or the like to remove the grease from the tapered part.
Tips of valves
Outer circumference of Camlifter
Outer circumference of Push rods
Outer circumference of O-rings 17
and 20 of the anti-icing valve portion
17
20
Remove grease.
Slidingparts insidethe engine
Sealing lips of Oil seals
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[3] DISASSEMBLY/ASSEMBLY
[3]-1. Warning
・There is a risk ofa burn injuryimmediately after the engine is stopped.So wait until the engine has completely cooled
before performing the work.
・Completely remove all fuel from the inside of Fuel tank and Carburetor before performing the work. [No open flames]
・Remove the engine oil before performing the work.
・Perform the work on a solid workbench in a place where dust, dirt, etc. will not enter inside.
・Remember how and where theparts were assembled whendisassembling the product andtake care not to make a mistake
when assembling the product.
Prepare boxes so that you can store the parts in groups when disassembling the product.
・Handle the removed parts carefully and clean and wash them properly.
・If a bolt or screw cannot be loosened, do not applyexcessive force. Use an impact driver or similar tool.
・Be sure to tighten bolts and screws to the specified tightening torque values.
・After assembling the main parts, turn the engine by hand to check that there is no abnormality or looseness.
[3]-2. Blower Section (Band CompletesL and R, Frame and Fan)
Disassembly
(1)Remove Band completes L and R and Hip belt. Remove each of the fixing parts as shown in Fig.1.
Fig.1
Pull out the band as shown above.
Position the buckle vertically
and then remove it.
Turn the center of Lock rivet with
a Phillips screwdriver to loosen it a
little and then remove it.
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(2) Loosen three M5x20 Pan head screws and then remove Recoil starter (a). (Fig.2)
(3) Loosen four 5x20Tapping screws and then remove Engine cover (b). (Fig.3)
(4)Remove six M5x16 Hex socket head bolts from the bottom and front of Frame (c). (Fig.4)
(5)Lift up Fuel tank and disconnect the earth wire of Ignition coil from the brass M5-10 Hex nut beneath Fuel tank. (Left photo of Fig.5)
(6) Disconnect Ignition coil at the bullet terminals(d) (Center photo of Fig.5),then disconnect Control cable (e) from Carburetor (f)
(Right photo of Fig.5), and then remove the integrated Control cable (e) and Lead unit from Front volute case (h). In the case of
EB7650WH, remove Control cable (e) from Clip (g). (Center photo of Fig.5)
(7)Remove the engine,Volute case and Fuel tank together and then replace Frame (c).
Fig.4
Fig. 2
(a)
Fig.3
(b)
(c)
Guard
(c)
Loosen this screw
onlywhen removing
Guard.
Fig.5
Disconnect (e) from (f).
(e)
2.Return Throttle
lever to its original
position and remove
the wire end.
1.Pull Throttle lever
and then hold it in
place with a finger.
(f)
Disconnect (e) from (d) and (g).
(d)
For Model EB7650WH,
remove (e) from(g).
(g)
Disconnect thewire from the
earth terminal.
M5-10 Hex nut
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(8)Turn four Compression springs 22 (the upper two are shorter than the lower two) used as vibration damper counterclockwise and then
remove them. (Fig.6)
(9)Loosen eleven 5x20Tapping screws and then remove Rear volute case (i). Remove Elbow (j) together with it. (Fig.7)
(10) Loosen the four M6x25 Hex socket head bolts and then remove fan (k). (Fig.8)
(j)
(i)
Fig.6
3
(h)
2
1
4
(k)
Upper
Lower
Fig.7
Fig.8
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Assembly
(1)Tighten the four fan fixing screws in a criss-cross pattern (the order shown in Fig.8).
(2)ScrewCompression springs 22 all the way onto Spring holders. The two shorter ones should be at the top (of Rear volute case) and the
two longer ones should be at the bottom (of Front volute case). (Fig.6)
If Rubber rings at the bottom have been removed, attach them as shown in the photo on the right of Fig.9and then screw the springs
onto Spring holders.
(3)Attach Elbow (a) with the protrusion positioned as shown in Fig.9so that you can rotate Elbowfrom the front
of the machine and then secure Rear volute case (b) with elevenTapping screws 5. (Fig.7)
(4)Attach Frame, then connect Carburetor to Control cable, then connect the bullet terminalsand earth wire of
Ignition coil and then secure Guard. (Figs.4and 5)
Place the bullet terminalsin place as shown in Fig.5 (d) while taking care that it will not become pinched
in the engine cover. Place corrugated tube (c) of Model EB7650THin place as shown in Fig.10.
Protrusion
(b)
Slide Rubber ringall the way onto each
Springholder with the flanged end ofthe
ring facing Front volute case.
(a)
(c)
Place the bullet terminalsand
line filter in this space, if used.
Fig.9
Fig.10
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(5)When fitting Engine cover complete (d), follow the instructions described in Fig.11.Make sure that Carburetor gasket is on the inner
side of the rib inside Engine cover complete and that Plug cover is not pinched.
Align the fixing screw boss positions and then fit the cover and secure it in place with the four screws. (Fig.3)
(6) Secure Band completesL and R with the fixing parts by reversing the disassembly procedure shown in Fig.1while taking care not to mix
them up.
Twist the bands;Band complete R by90 degreesclockwise and Band complete Lby 90 degrees counterclockwise viewed from the top,
and then attach them. (Fig.12)
Left
Right
Twist 90 degrees
Carry out disassembly and assembly
with Choke lever raised or t
he lever
will catchon the engine cover.
Insert along the guides
Recoil starter
Three M5x20
Pan head screws
(d)
Oil guard:
Attach before fitting Engine
cover complete.
Cylinder block
assembly
Choke lever
Four 5x20
Tapping screws
Fig.11
Fig.12
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(7) When the tubes havebeen disconnected fromFuel tank during disassembly, connect them as shown in Figs.13 and 14.
Outside of FuelTank
Cover the two tubes coming out of Fuel tank, individually, with Spiral tube 6-100, then cover
the tube of Breather (e) with the coil spring 8 and then slideTube guard 20-102 (f) all the way
to cover the tubes.
Fuel tank
Coil spring 8
(e)
Slide (f) all the way
to cover the tubes.
Spiral tube 6-100
Tube 3-370
(transparent blue)
Tube 3-370 (black)
Inside of Fuel Tank
Hose clamp
Filter
Tube 3-370
(black)
Tube 3-370
(transparent blue)
Slide (f) all the way
to cover the tubes.
Fig.13
Fig.14
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[3]-3.Throttle Lever Section
EB7650TH
Disassembly
(1) Remove M5x30 thumb screw (a). (Fig.15)
(2) Loosen five 4x18 Tapping screws and then remove Lever case R (b). (Fig.15)
(3) Remove the head of Control cable (c) from Throttle leverA(d) and then remove the lever. (Fig.15)
(4) RemoveThrottle link (e), disconnect the connector of Switch unit, and then replace Switch unit.
(5) Loosen M4x18 Hex socket head bolt and remove Throttle lever B (f). (Fig.16)
Assembly
・Attach Throttle link (e) at the position shown in Fig.16. First secure Throttle lever B (f) with the screw and then turn it counterclockwise
(viewed from the inside) to press the lever of Switch unit and then attachThrottle leverA(d).
(e)
(f) is on the back.
(a)
(b)
(d)
(c) (d)
Lever case L
Switch unit
Fig.15
Fig.16
Makita Corporation