Makita PM7650H Manual

PRODUCT
P 1/26
Models No. PM7650H
Description Petrol Mist Blower
Model PM7650H is a Petrol mist blower equipped with
75.6cm³ 4-stroke engine in compliance with all major
exhaust emission regulations in the world, and features
16m max. horizontal spraying range and ergonomically
designed chemical tank.
This product is also available with E25 compatibility
for Brazil only as Model PM7650HG.
Dimensions: mm (")
Width (W)
Height (H)
Length (L)
440 (17-1/4)
420 (16-1/2)
595 (23-1/2)
Diaphragm
75.6 (4.61)
2.7 (3.67) [at 7,000 min.ˉ¹]
Carburetor
Yes
Max. engine speed: min.ˉ¹ = rpm
Idling speed: min.ˉ¹ = rpm
Starting system
Engine
Displacement: cm³ (cu.in)
Max. output power: kW (PS)
4-strokeType
Max. spray range (horizontal): m (ft)
Dry weight*4: kg (lbs)
*1 Brazil: E25 gasoline
*2 This product is not in compliance with the regulations of San Dimas.
*3 with nozzle
*4 with Straight pipe 330
13.3 (29.3)
Recoil starter, with mechanical decompression
16.0 (52)
Max. air velocity: m/s
Max. air volume*3: m³/h
85
845
7,400
2,800
Fuel Straight gasoline*1
CONCEPT AND MAIN APPLICATIONS
Specification
Compliance with exhaust emission regulations*2;
CARB Tier 3, EPA Phase 2, EU Stage 2
SAE10W-30 oil
in Class SF or higher of API Classification
Engine oil
1.8 (61)Fuel tank capacity: L (US oz)
Chemical tank capacity: L (US oz) 15.0 (507)
TECHNICAL INFORMATION
H
W
L
Note: The standard equipment for the tool shown above may vary by country.
Oil bottle (containing 220ml of oil) ......... 1
Hand strap ............................................... 1
Box wrench ............................................. 1
Screwdriver ............................................. 1
Diffusion cover
(Wide spray attachment) ......................... 1
Hose clamp 76 ......................................... 3
Hose clamp 100 ....................................... 1
Flexible pipe ............................................ 1
Straight pipe 330 ..................................... 1
Straight pipe 330
Straight pipe 630
Bent top pipe 630 (20º)
O ring set
Air cleaner element
Nozzle 0.7
Nozzle 0.8
Standard equipment
Optional accessories
Straight pipe 630 (for Brazil only)
Bent top pipe 630 (20º) (for Brazil only)
Tube 10-500 (for Brazil only)

Repair
CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.
[4] DISASSEMBLY/ASSEMBLY
[4]-1. Warning
Follow the instructions described below in advance before repairing:
Wear gloves.
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 "[4]-16. 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.
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[1] NECESSARY REPAIRING TOOLS
[2] HANDLING OF GASKET
Code No. Description Use for
When Gasket is removed:
(1) clean up Gasket residues from mating surfaces with Gaskets removed.
(2) replace Gasket with new one.
Air density tester Diagnosing Carburetor1R127
Removing Piston pinRound bar for arbor 12-50
1R286
Fixing Flywheel completeHook wrench1R365
Removing Flywheel completeFlywheel puller1R364
Wire brush
Adjusting Ignition coil, Spark plug and Rocker arm assembly
Removing/mounting FlywheelHex socket bit 14
Cleaning Spark plug
Feeler gauge set1R366
• Apply Makita grease N No.2 to Spiral spring in Recoil starter.
• When disassembling the engine, apply ThreeBond 1216 to the mating surface
between Crankcase and Cylinder block. (Fig. 75)
[3] LUBRICANT/ADHESIVE APPLICATION
P 2/26

Repair
[4] DISASSEMBLY/ASSEMBLY
[4]-2. Nozzle section
Hose clamp 14Tube 10-500
P 3/26
Fig. 1
Fig. 2
Fig. 4 Fig. 5
Fig. 3
Diffusion coverTop adapterNozzle adapter complete
Straight pipe
M5x18 Pan head screw
Sleeve 25 Top adapter
4x20
Tapping screw
(1) Remove Tube 10-500 from Nozzle adapter complete by removing Hose clamp 14. (Fig. 1)
(2) By unscrewing M5x18 Pan head screw, Nozzle adapter complete can be separated
from Top adapter and Straight pipe. (Fig. 1)
(3) Remove Diffusion cover from Top adapter by turning it counterclockwise. (Fig. 1)
(4) Remove Sleeve 25 from Top adapter by unscrewing 4x20 Tapping screw. (Fig. 2)
(5) Remove O ring 28 from Sleeve 25. (Fig. 3)
(6) Remove Nozzle 4.5 from Nozzle adapter complete by turning it counterclockwise. (Fig. 4)
(7) Remove Nozzle cap from Nozzle adapter complete by unscrewing Bind PT 3x10 Tapping screw. (Fig. 5)
(8) Remove O ring 12 from Nozzle cap. (Fig. 5)
(9) Remove Pin 5.5 and Compression spring 3 from Nozzle adapter complete. (Fig. 5)
Assemble by reversing the disassembly procedure.
Nozzle 4.5
Nozzle adapter complete Nozzle cap
O ring 12
Bind PT 3x10
Tapping screw
Compression
spring 3
Pin 5.5
Nozzle adapter
complete
Sleeve 25 O ring 28
DISASSEMBLING
ASSEMBLING

Repair
[4] DISASSEMBLY/ASSEMBLY
[4]-3. Cock section
P 4/26
Fig. 6 Fig. 7
Fig. 9
Cock body
(1) Remove Tube 10-500 and Tube 10-750 from Cock body by removing two 14 Hose clamps. (Fig. 6)
(2) Remove Body holder complete from Control lever assembly by unscrewing two 4x14 Tapping screws. (Fig. 7)
(3) Remove Body holder complete from Cock body
by unscrewing two 4x14 Tapping screws. (Fig. 8)
(4) Remove Push button from Cock body by unscrewing
Bind PT 3x16 Tapping screw. (Fig. 9)
(5) Remove Body cover from Cock body by unscrewing
two 4x14 Tapping screws.
Compression spring 12 can now be removed from
Cock body. (Fig. 9)
(6) Remove O ring 18 from Body cover. (Fig. 9)
(7) Remove Valve rod from Cock body, then remove
O ring 9 and O ring 12 from Valve rod. (Fig. 9)
Hose clamp 14
Tube 10-500
Tube 10-750
4x14 Tapping screw
(2 pcs)
Control lever assembly
Body holder complete
Fig. 8
4x14 Tapping screw
(2 pcs)
Cock body
Body holder complete
Cock bodyPush button
Valve rod
Bind PT 3x16
Tapping screw Compression
spring 12
Body cover
4x14 Tapping screw
(2 pcs)
O ring 12O ring 9 O ring 18
DISASSEMBLING
ASSEMBLING
Assemble by reversing the disassembly procedure.
Note:
• Apply grease to the upper portion of O ring 12 on Valve rod.
• When mounting Push button onto Cock body, fit the flat sides of Push button’s inside projection
in the flat sides of the hole of Valve rod.

Repair
[4] DISASSEMBLY/ASSEMBLY
[4]-4. Pipe section
P 5/26
Fig. 10 Fig. 11
(1) Remove Straight pipe from Swivel pipe complete. (Fig. 10)
(2) Remove Swivel pipe complete from Flexible pipe by removing Hose clamp76. (Fig. 11)
(3) Remove Control lever assembly from Swivel pipe complete by unscrewing M5x25 Pan head screw. (Fig. 11)
(4) Remove Flexible pipe from Elbow by removing
Hose clamp 100. (Fig. 12)
Fig. 12
DISASSEMBLING
ASSEMBLING
Assemble by reversing the disassembly procedure.
Swivel pipe complete
Straight pipe
Hose clamp 76
Control lever assembly
Flexible pipe
M5x25 Pan head screw
Swivel pipe complete
Flexible pipe
Elbow
Hose clamp 100

Repair
[4] DISASSEMBLY/ASSEMBLY
[4]-5. Recoil complete, Engine cover, Fuel tank
P 6/26
Fig. 14
(1) Remove Recoil complete by unscrewing
three M5x20 Pan head screws. (Fig. 13)
(2) Remove Engine cover by unscrewing
four 5x20 Tapping screws. (Fig. 14)
DISASSEMBLING
Fig. 13
Recoil complete
M5x20
Pan head screw
(3 pcs)
5x20 Tapping screw
5x20 Tapping screw
5x20 Tapping screw
5x20 Tapping screw
Engine cover

Repair
[4] DISASSEMBLY/ASSEMBLY
[4]-5. Recoil complete, Engine cover, Fuel tank (cont.)
P 7/26
Fig. 17
(3) Remove the fuel tubes of Tube assembly from Carburetor and Primer pump. (Fig. 15)
(4) Remove Fuel tank from Frame complete by unscrewing three M6x12 Pan head screws. (Fig. 16)
DISASSEMBLING
Fig. 15
ASSEMBLING
Assemble by reversing the disassembly procedure.
Note:
•When connecting the fuel tubes of Tube assembly to
Carburetor and Primer pimp, do not confuse them.
Be sure to connect the black one to Carburetor and
the transparent blue one to Primer pump. (Fig. 15)
•When mounting Engine cover, be careful not to bend
nor pinch the breather pipe. (Fig. 17)
•Do not forget to pass the fuel tubes of Tube assembly
through the slit of Engine cover. (Fig. 18)
Fig. 16
Black fuel tube
of Tube assembly
Transparent blue
fuel tube of
Tube assembly
Carburetor
Primer pump
Fuel tank
Breather pipe
M6x12 Pan head screw (3 pcs)
Tube assembly
Fig. 18
Engine cover,
viewed from the rear
slit of Engine cover

Repair
[4] DISASSEMBLY/ASSEMBLY
[4]-6. Control cable
P 8/26
(1) Using cutting pliers, cut and remove Wire band that holds
Cable tube to Elbow. (Fig. 19)
(2) Remove Control cable and ON/OFF switch cords from the hook
of Volute case 2, then disconnect the bullet terminal of ON/OFF
switch cords. (Fig. 20)
(3) Remove Control cable and the high voltage cable of Ignition coil
from the wire holder of Volute case 2. (Fig. 21)
(4) Pull Control cable out of the space between Volute case and
Air cleaner cover complete. (Fig. 22)
(5) Remove Control cable from Carburetor. (Fig. 23)
DISASSEMBLING
ASSEMBLING
Note: Be careful not to bend Control cable.
(1) Pass the inner cable of Control cable through Adjust screw and Adjust nut,
then route it in the groove of Swivel and then hook the cable end on Swivel. (Fig. 23)
(2) Put Control cable in the space between Volute case and Air cleaner cover complete. (Fig. 22)
(3) Fix Control cable and the high voltage cable of Ignition coil in the wire holder of Volute case 2.
Be sure to fix Control cable first, then the high voltage cable.
Make sure that Control cable is tight and vertically straight. (Fig. 21)
(4) Connect the bullet terminal of ON/OFF switch cords securely. (Fig. 20)
(5) Hold Cable tube to Elbow with a new Wire band that holds. (Fig. 19)
Fig. 19
Fig. 21
Fig. 22 Fig. 23
Carburetor
Wire band
Elbow
Cable tube containing
Control cable and
ON/OFF switch cords
20 to 60mm
raised portion of Elbow
Control cable
high voltage cable
Fig. 20
Control cable
hook
bullet terminal
ON/OFF switch cord
of Switch complete
Adjust screw
Control cable
Swivel
cable end
Adjust nut
inner cable
Air cleaner case complete
Volute case
Control cable
wire holder

Repair
[4] DISASSEMBLY/ASSEMBLY
[4]-7. Tank complete (Chemical tank)
P 9/26
(1) Remove Tube 10-750 from Joint strainer by removing Hose clamp 14. (Fig. 24)
(2) Remove Tube 10-300 from Pressure pipe by removing Hose clamp 14. (Fig. 25)
(3) Remove Band R and Band L from Tank complete by removing four E-4 Stop rings with small pliers
then by sliding four size 5 Pins. (Fig. 26)
DISASSEMBLING
Fig. 24
Fig. 25
Fig. 26
Joint strainer
Hose clamp 14
Tube 10-750
Hose clamp 14
Pressure pipe
Tube 10-300
Stop ring E-4 (4pcs)
Pin 5 (4pcs)

Repair
[4] DISASSEMBLY/ASSEMBLY
[4]-7. Tank complete (Chemical tank) (cont.)
P 10/26
(4) Remove Cushion by unscrewing five M5x12 Pan head screws. (Fig. 27)
(5) Unscrew two M6x30 Pan head screws to disconnect Tank complete from Tank holder.
Be careful not to lose Flat washer 6 and Compression spring 20. (Fig. 28)
(6) Remove Tank complete from Frame complete by unscrewing four M6x30 Pan head screws. (Fig. 27)
(7) Remove Tube 10-300 from Joint 1 by removing Hose clamp 14. (Fig. 29)
(8) Remove Tube 10-500 from Joint 1 and Upper mixing body by removing
Hose clamp 14. (Figs. 30, 31)
(9) Separate Upper mixing body from Lower mixing body by unscrewing
two M5x12 Pan head screws. (Fig. 31)
(10) Remove Washer 10 and Check valve from Lower mixing body.
Be careful not to lose Washer 10. (Fig. 31)
(11) Remove Joint 1 from Tank complete. (Fig. 29)
(12) Remove Grommet from Tank complete. (Fig. 29)
DISASSEMBLING
Fig. 27 Fig. 28
Fig. 30 Fig. 31
M6x30
Pan head screw
(2 pcs)
Tank complete
M6x30
Pan head screw
(4 pcs)
Fig. 29
Hose clamp 14
Grommet
Joint 1
Tube 10-300
Joint 1
Hose clamp 14
Tube 10-500
Hose clamp 14
Upper mixing body
Upper mixing body
M5x12
Pan head screw
(2 pcs)
Washer 10
Check valve
ASSEMBLING
Assemble by reversing the disassembly procedure.
Flat washer 6 (2 pcs)
Cushion
M5x12
Pan head screw
(5 pcs)