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
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EB7650WH
Disassembly
(1) Loosen six 4x18 Tapping screws and then removeArm cover.
(2) Loosen M5x25 Hex socket head bolt and remove Throttle lever (a). (Fig.17)
(3) Remove the head of Control cable (b) fromThrottle lever (a), then disconnect the connector (c) of Stop switch wire and then pull out
Control cable (b), Lead unit, and Corrugated tube (d). (Fig.18)
(4) Loosen M6x25 Hex socket head bolt and then removeArm base (e).
(5) DisassembleArm base (e) andArm base holder (f) byremoving one of two E-4Stop rings (g) and then pushing out Rod 6 (h) from there.
(Fig.19)
Wave washer 20
(a)
Remove (b).
Disconnect (c).
Pull out (d).
(e)
(f)
Two rubber sleeves 6
(h)
(g)
Two torsion springs 21
(g)
Fig.17
Fig.18
Fig.19
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Assembly
(1) Fix Lead unit (a) in the lead wire holdersofArm (b) andArm cover (c). (Fig.20)
(2) Be sure to insert Wave washer 20 beneathThrottle lever. (Right photo of Fig.17)
(3) Insert Sleeve 7 (d) intoArm base (g) while aligning the flats of the two parts. (Fig.21)
(4) Pass Control cable (e), Lead unit (a), and Corrugated tube through at the position indicated in the right photo of Fig.18.
(5) InsertArm rubbers (f) (they are identical, and the orientation does not matter),and then attachArm cover (c).
(a)
Connector
(e)
Switch unit
(f)
(f)
(c)
(b)
(d)
(g)
(b) and Flat washer 12
go between (b) and (g).
Fig.20
Fig.21
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[3]-4. Engine Section (RockerArm,Valve Portion, and Camgear Portion)
*The blower section does not need to be disassembled when repairing Rocker arm and Camgear portions.
Disassembly
(1)Refer to "[3]-2. Blower Section (Band CompletesLand R, Frame and Fan)" (page 4), then remove Recoil starter and Engine cover
and then disassemble Camgear portion. Leave Frame attached.
(2)Remove three M6x18 Hex socket head bolts(a) and then remove Muffler gasket (b) and Exhaust port spacer (c). (Fig.22)
(3)Refer to "[3]-6. Carburetor" (page 18) and then remove Carburetor.
(4)Remove Camgear cover (d). Do not remove Pulley (e) or you will have to turn the engine by hand. (Fig.23)
(5)Turn Pulley (e) to align the alignment marks(f). Pull out Pin 5 used as cam lifter shaft [part No.256186-0] (g)
and remove Cam lifter L (h) and Cam lifter R(i). (Fig.24)
(6) Pull out pin 5 used as Camgear shaft [part No.256200-2] (j) and remove Camgear (k), and then check that the gear teeth and
counterweight portion are not damaged.
(d)
(e)
(i)
(h)
(j)
(g)
(k)
(f)
(c)
(b)
Muffler
(a) 3 pcs.
Fig.22
Fig.23
Fig.24
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(7)RemoveAir cleaner cover andAir cleaner element and then loosen two M5x60 Pan head screws (l) securing Carburetor. (Fig.51)
Do not remove them. Leave them inserted for easier assembling. (Fig.25)
(8) Remove Air cleaner case and Carburetor and move them a little out of the way as shown in Fig. 25 and then remove two M5x25 Hex
socket head bolts securing Insulator with 1R229.At this time, do not loosen the lower hex socket head bolt. (Fig.25)
(9)Remove Plug cap (m) and then disconnect the two tubes (n) with 1R311. (Fig.26)
(10) Loosen two M5x30 Hex socket head bolts (o) and remove Rocker cover complete (p). Loosen five M6x35 Socket head bolts (r) of
Cylinder head complete (q). (Fig.27)
(q)
(r) 5 pcs.
Remove (p) first.
(o)
(o)
Do not loosen
thishex socket head bolt.
Leave (l) inserted.
Do not remove them.
1R311
(m)
(n)
Fig.25
Fig.26
Fig.27
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(11) Move Pusher rods (s) and remove Cylinder head complete (t).(Fig.28)
(12) Push in Retainer with1R389 and1R005 to compress Compression spring 11 (w) and remove Cotter (v) with a bit or the like (u)
magnetized with 1R288. (Fig.29)
(13)Remove Intake valve (x) and Exhaust valve (y) to replace or clean them. (Fig.30)
(s)
(t)
(v)
1R389
1R005
(u)
Disassembly of Rocker arm is
prohibited. Replace Cylinder
head complete entirely.
Cylinderhead
complete
Retainer
(y)
(x)
(v) 4pcs.
(w) 2pcs.
Two Retainers
Exhaust port spacer
Fig.28
Fig.29
Fig.30
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Assembly
(1)Assemble the partsby reversing the disassembly procedure.
(2) Rotate Pulley to turn Crankshaft clockwise to align the alignment mark of two lines (a) on Flywheel so that they are parallel with the
surface of Crankcase. “N”on the north pole of Flywheel will be positioned directly below the surface ofCrankcase. (Fig.31)
(3)Align the alignment mark onCamgear (b1) and that of Crankcase (b2),then assemble them and then attach Camgear cover. (Fig.32)
・Please note that the engine speed willnot increase if even one of the gear teeth is not aligned.
・Install the gasket so that theconvex surface is facing the engine side. (Fig.33)
“N”on the north
pole of Flywheel
(a)
Ignition coil
Crankcase
Flywheel
(a)
(b1)
When turning Camgear by
hand, rotatePulley in the
direction of thearrow.
(b2)
Fig.31
・
Install so that the convex surface
is facing the engine side.
Cross section of gasket
Fig.32
Fig.33
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(4)Adjust the clearance between Rocker arm(c) andValve with a wrench 8 (d) and a hex wrench 2.5 (e) so that it is 0.1 to 0.14 mm when
measured with 1R366. (Fig.34)
When tightening M5x9 Hex socket head screw with (d), hold M5 Hex nut with (e) to prevent it fromrotating together with the screw.
・Be sure to adjust the clearance after Camgear cover has been attached. If it is adjusted with the cover removed, Pin 5 used as Cam
lifter shaft [part No.256186-0] and Pin 5 used as Camgear shaft [part No.256200-2] will not be stable so the clearance will change
when the cover is attached after adjustment.
(5)Turn Pulleyclockwise by hand to rotate Crankshaft twice, check the gap, and then fully tighten. Confirm that a 0.15 mm leaf of the
feeler gauge cannot be inserted.
(6)ApplyThreeBond 1342 or Loctite 243 to three M6x18 Hex socket head bolts for securing Muffler and five M6x35 Socket head bolts for
securing Cylinder head complete when you re-tighten them because they are thread locking bolts.
[3]-5.Air CleanerCase
(1)Pull the nozzle, insert a thin slotted screwdriver at the position shown in Fig.35, and remove Separator plate (a).
(2)Use the screwdriver in the same way to pull off Separator mesh (b). (Fig.36)
(3)Loosen3x10 Tapping screw and remove Separator case.
(4)Use an awl or similar tool to pull out Check valve (c). (Fig.37)Take care not to damage it.
(5) When installing Separator plate (a),tilt it first and then insert it as shown in Fig.38.
(a)
(b)
(c)
(a)
(d)
(e)
M5 Hex nut
(c)
M5x9 Hex socket head screw
1R366
Fig.34
Fig.35
Fig.36
Fig.37
Fig.38
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[3]-6. Carburetor
Disassembly
(1)Refer to "[3]-2. Blower Section (Band CompletesLand R, Frame and Fan)" (page 4) and then remove Engine cover complete and
disconnect Control cable from Carburetor.
(2)Raise (close) Choke lever, then remove two M5x60Pan head screws (b) and 5x20Tapping screw(c) fromAir cleaner case (a), then
disconnect the tubes, and then removeAir cleaner case and Carburetor. (Fig.39)
(3) The Carburetor can be disassembled as shown in Fig.40.
(A)Adjust screw (B) Cable adjust nut M6
(C) Throttle assembly (D) Carburetor
(E) Conical compression spring 5-9 (F) Pump gasket
(G) Inlet screen (H) Metering diaphragm
(I) Metering diaphragm cover (J) Cable bracket
(K) M3x10 pan head screw (2 pcs.) (L) Packing ring
(M) Main jet (N) O ring
(O) Pump diaphragm (P) Pump bodyassembly
(Q) Metering diaphragm gasket (R) Screw (4 pcs.)
(4)Check the membrane around the metal partof Metering diaphragm (H) and replace the diaphragm if there is any deformation or
hardening.
(I)
(P)
(O)
(F)
(G)
(H)
(Q)
(R)
(C)
(E)
(L)
(D)
(J)
(A)
(B)
(K)
(M)
(N)
(a)
(b)
(c)
Fig.39
Fig.40
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Rotor
(5)Also replace Pump diaphragm (O) if there is any deformation or hardening.
(6)Remove Inlet screen (G) while taking care not to deform it and then clean it with carburetor cleaner.
(7)Be sure to use carburetor cleaner to clean the main jet portion at the center.
・Do not use air duster because parts such as Check valve may be damaged if they are cleaned with air duster.
(8)Replace Metering diaphragm gasket (Q) and Pump gasket (F) if possible when you disassemble Carburetor.
Assembly
(1) Make adjustment ofAdjust screw for Control cable as shown in Fig.41.
(2)Check that Rotor contacts the stopper both at idling and full throttle and that the specified rotation speeds (refer to "[3]-10. Completion
Inspection Check Points" [page 28]) are achieved after assembly.
(3)Refer to Fig.42for the position to connect each tube to Carburetor.
Primer pump
Tube 3-370 (transparent),
to Fuel tank
Tube 3-60 (transparent),
toCarburetor
Tube 3-370 (black),
to Fuel tank
Connect the two black tubes toAir cleaner case (a) and
passthemthroughthecutoutholein Carburetor gasket
(large) (b).
Branch
Single
(b)
Insert Carburetor gasket
(small) here.
(a)
Insert the two tubes in the
right rib. Place the black one
beneaththetransparentone.
Do not use the left side.
Carburetor
To Rocker arm chamber
To Cylinderside
f
For connecting tubes to Fuel tank,
refer to assembly procedure 7 of "[3]-2.
Blower Section (Band Completes L and
R, FrameandFan)" (page 12).
Fig.41
Fig.42
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(4)Use 1R311 to slide thetubes all the way over the nipples (c) until they stop. (Fig.43)
Make sure that the tubes are not pushing against Carburetor gasket (large) (b).
(5)Connect the tubeswith Hose joint (d) oriented as shown in Fig.44.
45 ﾟ±10 ﾟ
The tubes should
not push against (b).
(b)
To Rocker arm chamber
1.0 mm or less
The gap should be
1.0mm or less.
(c)
Orientation of (d) viewed fromthe
direction of theyellow arrow
Fig.43
Fig.44
Makita Corporation