SHINDAIWA OWNER’S AND
OPERATOR’S MANUAL
EC7500/EC7600
ENGINE CUTOFF SAW
WARNING!
Read this manual and familiarize yourself with its contents.
This unit is designed primarily for cutting construction materials and metal ac-
cording to the type of cutting wheel installed.
To minimize the risk of injury to yourself and others, always wear hearing pro-
tection, a dustproof mask, goggles and a helmet when operating this unit.
Keep this manual handy so you can refer to it when required.
Part Number 68006-94310 Rev. 12/04
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Safety Precautions
WARNING!
Before Operation
Children and people who do not
understand this manual must not
use this unit.
To minimize the risk of sparks
igniting clothing while operating the
unit, wear clothing made of leather,
wool, tightly-woven cotton, or cotton
treated with flame-retardant.
Never allow other people or
animals to be near the unit when
starting or operating.
Never use any cut-off wheel that is
not recommended in this manual.
Never touch a rotating cut-off
wheel.
Do not start or operate the unit un-
less you have a clear work area and
secure footing.
Operate the unit only in a well
ventilated area.
Do not operate the machine for
more than two hours a day in total.
Do not operate it for more than ten
minutes continuously. Due to vibra-
tion, excessive operation may cause
you white finger disease.
Never operate the unit in a closed
area such as a room, warehouse
or tunnel. Running the unit in
a closed area may cause seri-
ous illness or even death due to
exhaust gas.
Never smoke or use fire near the
Never allow any people or ani-
unit or its fuel.
mals near exhaust gas.
Since the muffler and exhaust gas
become very hot, make sure there
are no flammable substances near
the unit.
Never inhale exhaust gas.
Never make unauthorized modifi-
cations or alterations to any of the
components of the unit, and never
operate the unit without the wheel
guard or muffler.
Never run the unit if you discover a
fuel leak.
Make sure all the components are
in place and the bolts are securely
fastened.
This unit is designed for one-man
operation and must be operated
by only one person.
Make sure the cut-off wheel is
securely fastened and is not dam-
aged. Never use a cut-off wheel
with cracks, distortion, or one that is
unbalanced.
Never operate the unit when you
are tired or under influence of
any substance that could impair
vision, dexterity or judgement.
When operating the unit, always
wear snug-fitting clothing, safety
gloves, safety non-skid footwear,
hearing protection, a dust-proof
mask, a helmet and goggles. Nev-
er wear floppy clothing, shorts,
sandals or accessories that could
become entangled.
Make sure the belt tension is prop-
erly adjusted and the wheel guard,
belt guard and clutch cover are
securely assembled.
Always inspect the front handle, rear
handle and wheel guard before use,
and never use the unit if the parts
are damaged.
A first-time operator should obtain
practical instruction from a dealer
or an experienced user before
using the unit.
3
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Safety Precautions (continued)
WARNING!
Before Operation (continued)
Do not use the cut-off saw to cut
or disturb asbestos or products
containing or wrapped in asbestos.
If you believe you might be cutting
asbestos, contact your supervisor.
Before cutting into a mate-
rial, familiarize yourself with
the risks associated with dust,
fumes, or mists that may
be generated during opera-
tion. Make sure you provide
adequate protection against
harmful emissions. A high-
performance respirator and/or
water attachment may be
required.
Fueling the Unit
Open the fuel cap slowly to
release any possible build-up of
pressure.
Mixing fuel and engine fuel-
ing must be done outside, and
where no other combustibles
are nearby.
Never refuel when the unit is hot.
Allow to cool before refueling.
Never fuel when the engine is run-
ning.
After fueling, wipe all spilled fuel.
Cutting metal may cause sparks
from the cut-off wheel and may ig-
nite spilled fuel which could result
in serious injury.
Figure 1. Start the engine at least
3 meters from a fueling location.
Starting The Engine
Start the engine according to
the instructions in this manual.
Start the engine on a firm, stable
surface. Make sure the area is
clear of bystanders. Starting the
engine must be done by only
one person without any assis-
tance.
Start the engine at least 3
meters away from a fueling
location.
When starting the engine, make
sure the cut-off wheel does not
touch any object or ground.
As soon as the engine starts,
the cut-off wheel may begin to
rotate.
The cut-off wheel should not
rotate at engine idle. If it does,
reduce idle speed.
Never leave the unit running
unattended.
4
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Safety Precautions (continued)
WARNING!
Kickback
Kickback may force the cut-off
wheel up and back toward the
operator lightning-fast.
Kickback can occur whenever
the upper half of the cut-off
wheel touches an object. Never
cut an object using the upper
half of the cut-off wheel.
EC7500.14
Figure 2. Always be aware of, and pre-
pared for, kickback.
Operation
The unit must be held firmly with
both hands, one hand on the
rear handle, the other on the
front handle. Never hold onto
any other part of the unit.
Never impact or apply pressure to
the sides of the cut-off wheel for
any reason.
Maintain firm and stable footing
during operation. Do not over-
reach.
When working in a group,
make sure operators are least
10 meters away from each other.
If you drop the unit or strike it
against a hard surface, stop the
engine immediately and inspect
for damage. If you discover dam-
age, have it repaired before you
return the unit to service.
EC7500.17
Figure 3. Always operate
below chest level.
Check the fuel filler cap regularly
during operation to make sure it
remains securely tightened.
This unit must be operated
below chest level. Operating
above chest level may result in
serious injury.
When cutting vertically, the unit
should be positioned horizon-
tally or with the wheel side tilted
slightly down. When cutting
horizontally, the recoil starter-
side should face up.
5
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Safety Precautions (continued)
WARNING!
Operation (continued)
Inspection and Maintenance
If you discover fuel leakage, im-
Before performing any inspection,
maintenance, repair or cleaning
of the unit, make sure engine
and cut-off wheel are completely
stopped and cooled down.
mediately stop the engine.
Cutting may cause sparks from
the cut-off wheel. Make sure
there is no flammable substanc-
es nearby.
Inspection and maintenance
operations should be done in a
well ventilated location and where
there are no combustibles nearby.
Never cut live electrical wires.
The shock you might receive
could be very serious.
When replacing parts, always use
Shindaiwa genuine parts. Using
non-Shindaiwa genuine parts may
result in serious injury.
Do not touch hot parts such
as the muffler or cylinder. You
could burn yourself severely.
The cut-off wheel gets hot while
cutting. Never touch the wheel
immediately after cutting. You
could burn yourself severely.
Inspection and maintenance
operations not mentioned in this
manual should be performed by
an authorized Shindaiwa dealer.
While the engine is running,
never touch high voltage parts
such as the spark plug cap and
plug cord.
Transport and Storage
When carrying the unit, make
sure engine and cut-off wheel are
completely stopped.
Stopping The Engine
Carry the unit with the front
handle and with cut-off wheel fac-
ing rearward.
The cut-off wheel coasts for
a while after the engine is
stopped. Keep hold of the unit
firmly until the wheel stops com- When storing the unit, make sure
pletely and then place it on the
ground.
the cut-off wheel is removed and
the unit is placed on a secure, dry
place.
Keep the unit away from children.
When storing the unit for more
than a few days, empty the fuel
tank completely.
Store gasoline and mixed fuel in
a closed, dry place and where
combustibles are not nearby.
6
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Safety and Operation Information Labels
IMPORTANT!
Make sure all safety and operation
information labels are undamaged
and readable. Immediately replace
damaged or missing safety and
operation information labels, which
are available from your authorized
Shindaiwa dealer.
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EC7500.1
EC7500 EC7600
Figure 4
7
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Unit Description
Air Cleaner
Cover
Muffler
Carburetor Idle
Adjustment Screw
Choke
Belt Guard
EC7500.18
Wheel Guard
Lock Knob
Decompression
Valve
Primer
Pump
Clutch
Cover
Rear
Handle
Front
Handle
Recoil
Starter
Throttle
Trigger
Lockout
Cut-off
Wheel
EC7500.1A
Cylinder
Cover
Throttle
Trigger
Fuel Filler
Cap
ON/OFF
Switch
Figure 5
8
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Technical Specifications
Engine Type............................ 2-Cycle, Power Transmission ........... Automatic
vertical-cylinder, air-cooled
centrifugal clutch, V-ribbed belt
Displacement........................ 73.5 cm3* Anti-Vibration System.............. Unified
handles with 7-point support
Bore x Stroke......................51 x 36mm
Safety Devices...........Throttle lock-out,
Max. Power Output** ................. 3.3kW
wheel guard
Recommended Engine Idling
Dry Weight (without wheel)
Speed................. 2,500 min-1 (rpm)**
EC7500...................................10.0kg
EC7600 ..................................10.5kg
Recommended Maximum Engine
Speed............... 10,450 min-1 (rpm)**
Dimensions (L x W x H)
EC7500..............740 x 220 x 375mm
EC7600 .............765 x 220 x 390mm
Maximum Cutting Depth, EC7500
Abrasive Wheel
305mm.................................. 102mm
Diamond Wheel
320mm.................................. 109mm
Sound Pressure Level†
EC7500.............................. 97 dB (A)
EC7600 ............................. 97 dB (A)
Maximum Cutting Depth, EC7600
Abrasive Wheel
Sound Power Level††
EC7500............................ 108 dB (A)
EC7600............................ 110 dB (A)
355mm.................................. 127mm
Diamond Wheel
360mm.................................. 129mm Vibration Level§
Front handle (idle/rated spindle)
Rated Spindle Speed†
EC7500....................6.96/5.48m/sec2
EC7600................10.09/10.49m/sec2
Rear handle (idle/rated spindle)
EC7500................. 3,800 min-1 (rpm)
EC7600.................. 3,320 min-1 (rpm)
EC7500..................8.61/14.60m/sec2
EC7600..................8.93/13.70m/sec2
Maximum Spindle Speed†
EC7500.................. 4,180 min-1 (rpm)
EC7600................. 3,650 min-1 (rpm)
Recommended Cut-off Wheels
EC7500, abrasive.................305mm dia
EC7500, diamond.................320mm dia
Maximum Peripheral Wheel Speed†
EC7500...............................67 m/sec
EC7600 ..............................68 m/sec
EC7600, abrasive.................355mm dia
EC7600, diamond.................360mm dia
Speed Reduction Ratio
EC7500................................... 2.50:1
EC7600................................... 2.87:1
Arbor Sizes ............................... 20mm,
22mm, and 25.4mm
Type of Fuel ...........Unleaded gasoline
*
Measured in accordance with EN ISO 11201:
1995.
plus 2-cycle engine oil (50:1)
** Measured in accordance with ISO 7293: 1983.
†
Measured with 305mm wheel (EC7500) and
355mm wheel (EC7600).
Fuel Tank Capacity ....................800ml
Carburetor Type..................Diaphragm
Ignition System.....................Electronic
Spark Plug.....................NGK BPMR7A
†† Measured in accordance with EN ISO 3744:
1995.
§
Measured in accordance with EN 28662-1:
1992.
Engine Starting/Stopping ...................
Toggle switch, recoil starter
9
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Assembly
IMPORTANT!
Prior to Assembly
This unit is
Before assembling, make sure you
have all the components required for a
complete unit. This unit consists of the
items shown in Figure 6.
Carefully inspect the engine unit for
damaged or loosen bolts. If you find
any damage or missing items, check
with your dealer.
Drive
Collar
equipped with
a 22mm wheel
collar. Wheel
adapters for
Shaft
20mm and
25.4mm cut-off
wheels are
located in the
tool set. Before
mounting a
Flange
Snap
Ring
EC7500.45
Engine Unit
EC7500.49
wheel, deter-
mine its arbor
diameter. If it
is necessary to
replace the col-
20 mm 22mm 25.4mm
Collar Collar Collar
lar, remove the snap ring on the arbor,
install the correct size arbor collar,
and then replace the snap ring.
EC7500.19
WARNING!
Instruction
Manual
Tool Set
Use of the incorrect collar size may
lead to wheel failure and unit failure
that could result in serious injury.
Figure 6
2. Make sure the ON-OFF switch is
Off and the engine is stopped.
Mounting the Cut-off Wheel
1. Select a cut-off wheel for your work
according to the following chart.
Refer to the wheel manufacturer’s
manual for additional information.
3. Insert a hex wrench into the hole in
the belt guard to prevent the arbor
from turning. See Figure 7.
Recommended Cut-off Wheels
Inner bore: 20mm, 22mm, 25.4mm
Belt
Guard
Wheels for EC7500
Abrasive: 305mm outer diameter
Diamond: 320mm outer diameter
Hex
Wrench
Wheels for EC7600
Abrasive: 355mm outer diameter
Diamond: 360mm outer diameter
EC7500.20A
Figure 7.
10
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4. Loosen bolt with the wrench and
remove bolt and outer flange.
See Figure 8.
WARNING!
Outer
Flange Bolt
Using an inappropriate cut-off
wheel may cause the wheel to
break and may result in serious
injury.
Tighten
6. Replace outer flange and bolt, and
then, while holding hex wrench in
the hole in belt guard, tighten the
bolt with wrench.
EC7500.20
Loosen
Figure 8
7. Make sure the cut-off wheel is
securely fastened. Spin the wheel to
make sure it does not wobble.
5. Place cut-off wheel so the inner
bore is properly set onto the collar.
Filling the Fuel Tank
Use only fresh, clean unleaded
gasoline with a pump octane of 87
or higher.
WARNING!
Mix all fuel with a premium 2-cycle
air-cooled mixing oil at a 50:1 gaso-
line/oil ratio.
When filling the fuel tank, make
sure the engine is stopped and
cool.
Filling the fuel tank or mixing
fuel and oil must be done in a
place where there is no risk of
fire.
Examples of 50:1 mixing quantities
5 liters gasoline to 100ml mixing oil.
IMPORTANT!
Mix only enough fuel for your imme-
diate needs. If fuel must be stored
longer than 30 days and oil with fuel
stabilizer is not used, it should first be
treated with a fuel stabilizer such as
StaBil™.
CAUTION!
Some gasolines contain alcohol as
an oxygenate! Oxygenated fuels
may cause increased operating
temperatures. Under certain condi-
tions, alcohol-based fuels may also
reduce the lubricating qualities of
some mixing oils. Never use any
fuel containing more than 10% al-
cohol by volume! Generic oils and
some outboard motor oils may not
be intended for use in high-perfor-
mance air-cooled 2-cycle engines
and should never be used in your
Shindaiwa engine.
1. Use a container to pre-mix gasoline
and oil. Pour oil in first, then add
gasoline.
2. Remove the fuel filler cap by turn-
ing counterclockwise.
3. Fill the tank with the mixed fuel,
then tighten the fuel filler cap se-
curely.
CAUTION!
4. Any spilled fuel must be wiped up
completely. Make sure the unit has
no fuel leaks.
This engine is designed to oper-
ate on a 50:1 mixture consisting of
unleaded gasoline and premium
2-cycle mixing oil only.
11
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Starting the Engine When the Engine is Cold
WARNING!
Before starting the engine,
place the unit on a clean, level
surface. Make sure you have
good secure footing and always
keep a firm grip on the unit.
EC7500.22
Move at least 3 meters away
from the fueling site before
starting the engine.
Figure 10.
7. Grip the recoil starter handle with
your right hand, pull the starter
cord slowly until you feel the starter
engage, then…
Make sure the cut-off wheel is
well clear of obstacles. The cut-
off wheel may rotate when the
engine starts.
8. …start the engine by pulling the
starter cord upward rapidly.
Keep bystanders well away.
Never start the engine without a
CAUTION!
cut-off wheel installed.
The recoil starter can be dam-
aged by abuse.
1. Turn the on-off switch On.
Never pull the starter cord to its
2. Depress the primer pump a few
times repeatedly until the primer
pump is almost filled with fuel.
See Figure 9.
full length.
Always engage the starter be-
fore cranking the engine.
Always rewind the starter cord
slowly. Do not just let go of the
cord.
Choke
Primer
Pump
9. When the engine fires, push the
choke in to its original position
(choke open).
10. If the engine does not continue to
run, pull the recoil again.
EC7500.21
11. As the engine starts, clear excess
fuel from the combustion chamber
by revving the engine several times.
Figure 9
3. Push the decompression valve In.
4. Pull the choke all the way out
(choke closed). The throttle will
automatically be set to fast idle.
See Figure 9.
IMPORTANT!
The throttle trigger can not be moved
without first depressing the lockout
lever.
Operating the throttle will automatically
disengage the fast idle setting.
5. Place the unit on firm ground.
6. Secure the unit by placing your
right foot inside the rear handle and
your left hand on the front handle.
See Figure 10.
12. Let the engine run at idle speed for
2-3 minutes to warm up.
12
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Starting a Warm Engine
1. Turn the on-off switch On.
WARNING!
The cut-off wheel must not rotate
at idle speed. If it rotates, reduce
idle speed by adjusting the idle
adjust screw.
EC7500.24
Figure 12
4. Remove the plug cap and discon-
nect the spark plug by using the
plug wrench. See Figure 13. Check
to see if the spark plug electrode is
fuel-soaked.
2. Push the decompression valve in.
3. Pull the choke all the way out and
push it back to the original position
(choke open). The throttle is auto-
matically set at a fast idle position.
4. Follow Steps 5 though 12, Starting a
Cold Engine (previous page).
If the Engine Doesn’t Start
If the engine fails to start, repeat the
appropriate starting procedure for a
cold or warm engine.
EC7500.25
Figure 13
WARNING!
5. If the spark plug is wet, dry it com-
pletely. Clear excess fuel from the
combustion chamber by cranking
the engine several times with the
spark plug is removed.
Keep well away from fire!
If the engine still does not
start,
1. Pull the choke all way out.
6. Reassemble the spark plug, plug
cap, filter and cleaner cover.
2. Unscrew the knob on the cleaner
cover and remove the cleaner cover.
See Figure 11.
7. Follow the appropriate starting
procedure described above.
8. If the spark plug is dry, fuel is likely
not being supplied to the combus-
tion chamber properly.
Check the fuel filter and carburetor.
Refer to the Inspection and Mainte-
nance Section.
Choke
Refer to the Troubleshooting Sec-
tion, page 24.
If the engine still does not start, con-
tact your Shindaiwa dealer.
EC7500.23
Figure 11
Stopping the Engine
Let the engine run at idle speed for 2-3
minutes, then turn the on-off switch
Off.
3. Unscrew the two bolts securing the
filter element, remove the filter ele-
ment. See Figure 12.
13
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Operation
Adjusting Wheel Guard Angle
Adjust the position of the wheel guard
so that fragments will not fly toward
you if the wheel fractures. To reposi-
tion the wheel guard, loosen the lock
knob (counterclockwise). When the
wheel guard is positioned correctly,
securely tighten the lock knob.
See Figure 14.
WARNING!
Never permit bystanders or
animals near the unit when
starting or operating the unit.
Be aware of kickback!
Kickback may force the cut-off
wheel up and back toward the
operator lightning-fast. Kick-
back can occur whenever the
upper half of the cut-off wheel
touches an object. Never cut
an object using the upper-
half of the cut-off wheel.
Wheel Guard
Locked
Wheel
Guard
Wheel Guard
Free
Lock
Knob
When operating, always wear
snug-fitting clothing, safety
gloves, safety non-skid foot-
wear, hearing protection, a
dust-proof mask, a helmet and
goggles.
EC7500.27
Figure 14
Cutting
WARNING!
This unit performs most efficiently
when cutting between 8,500 and 9,500
min-1 (rpm). While running the engine
at full throttle, apply slight pressure to
the cut-off wheel against an object so
that engine speed stays at 8,500–9,500
min-1 (rpm). Too much pressure to the
wheel will lower wheel speed, reducing
cutting efficiency considerably.
When using the cut-off saw, the
wheel guard must be securely in
position as a protection against a
broken wheel. If the wheel guard
is not in place, a broken wheel
could project fragments at high
speed and strike you or others,
possibly resulting in serious injury.
1. Make sure you have a clear work
area and secure footing.
Wet or Dry Operation
This unit is designed to be operated
for either dry or wet cutting. A water
dust-suppression kit is available for
this unit but is not supplied in the
unit packaging. Please refer to the
assembly and operating instructions
supplied with the water dust-suppres-
sion kit.
2. Position the cut-off wheel vertically
to an object. Start cutting at a low
speed and then gradually accelerate
the speed.
14
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Reversing cutting head for flush cutting operations
WARNING!
Before performing any work on the cut-off saw, make sure the engine is
stopped and the ignition switch is OFF.
Remove Cutting Wheel
Belt Guard
Loosen
Two Bolts
EC7500.34
EC7500.35
6mm Socket-
Head Bolts
Figure 17
Tension Screw
Tension
3. Using a 6mm hex wrench, remove
Indicator
the two belt guard bolts and slide
Figure 15
the belt guard forward to remove.
See Figure 17.
NOTE:
For units equipped with a water kit,
loosen the (2) water nozzles and dis-
connect the main water line from the
double nozzle.
1. Remove the cutting wheel (See
pages 10 and 11). Using a Phillips
screwdriver, loosen the tension
screw until the tension indicator is
all the way to the front of the scale.
See Figure 15.
C7500.34
Figure 18
4. Remove the blade mount from the
mounting surface and rotate the
blade mount 1800, then remount
to the right hand side of mounting
surface. See Figure 18.
Tension Screw
Figure 16
Mount
2. Back off tension screw another 4-5
turns so that adequate clearance is
achieved where the tension screw
contacts the mount when the mount
is turned over. See Figure 16.
15
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Reversing cutting head for flush cutting operations(cont.)
6mm Socket-
Head Bolts
Figure 20
Figure 19
6. Adjust the tension screw until the
tension indicator is in the middle of
the scale. See Figure 20.
5. Making sure that the drive belt is
fully engaged in the drive pulleys,
slide the belt cover on and install
the two socket-head bolts into the
left-hand side of the mounting sur-
face only until the bolts bottom on
the belt cover. See Figure 19.
7. Tighten the two mounting bolts
securely.
8. Reconnect the main water line,
adjust and retighten water nozzles
(if equipped with a water kit).
9. Reinstall the cutting wheel.
Inspection and Maintenance
MAINTENANCE, REPLACEMENT, OR REPAIR OF EMISSION CONTROL DE-
VICES AND SYSTEM MAY BE PERFORMED BY ANY REPAIR ESTABLISHMENT
OR INDIVIDUAL. HOWEVER, WARRANTY REPAIRS MUST BE PERFORMED BY
A DEALER OR SERVICE CENTER AUTHORIZED BY SHIN-DAIWA KOGYO, LTD.
AND USE OF PARTS THAT ARE NOT EQUIVALENT IN PERFORMANCE AND
DURABILITY TO AUTHORIZED PARTS MAY IMPAIR THE EFFECTIVENESS
OF THE EMISSION CONTROL SYSTEM AND MAY HAVE A BEARING ON THE
OUTCOME OF THE WARRANTY CLAIM.
Inspection and Maintenance Requirements
Item
What to Do
Clean
Daily
Weekly Monthly As Req’d
Air Cleaner
Cut-off Wheel Check & Sharpen
Bolts/Screws
Fuel Cap
Check & Retighten
Check Leakage
Check Leakage
Check Function
Fuel Tank
Wheel Guard
Clutch Bearing Grease
Belt
Check and Adjust
Spark Plug
Cylinder Fins
Fuel Filter
Carburetor
16
Check and Clean
Clean
Clean
Adjust
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Cleaning the Air Cleaner
Unscrew
the Knob
WARNING!
Pre-filter
Inspection and maintenance
should be done in a well ventilated
place and where there is no risk of
fire.
EC7500.23
Choke
Dust in the air cleaner will affect en-
gine life. The air filter must be cleaned
every time you start operating.
EC7500.48
Remove
the Filter
and Pre-
filter
Filter
Clean the air filter once a day and
replace the filter every 20 hours of
operation according to the follow-
ing procedures. See Figure 21.
EC7500.24
Figure 21
IMPORTANT!
1. Pull the choke lever out so that dust
will not enter the carburetor.
When cleaning the filter, the filter
housing and the inside of the cleaner
cover should also be cleaned.
2. Unscrew the knob on the cleaner
cover and remove the cleaner cover
and filter.
6. Replace the pre-filter onto the filter
and reassemble them into the filter
housing. Make sure both filter bolts
are securely tightened.
3. Remove the pre-filter from the filter.
4. clean the pre-filter with soap and
water and let dry.
7. Reinstall the cleaner cover and
make sure the knob is securely
tightened.
5. If compressed air is available, blow
air from inside the filter to remove
dust. If compressed air is not avail-
able, remove dust by gently tapping
the element on a hard surface.
17
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Adjusting the Carburetor
It is not necessary to adjust the carbu- To adjust idle speed, turn the Idle
retor when the unit is new. Adjust the
Adjust Screw with a screwdriver. See
Adjusting Idle Speed
carburetor only when you are sure it is Figure 22. Turn clockwise to increase
necessary due to differences in work-
ing conditions such as atmospheric
pressure or temperature, or change
in unit conditions after more than 10
hours of use.
idle speed. Adjust idle speed so the cut-
off wheel does not rotate at idle.
Recommended idle speed:
2,200–2,600 min-1 (rpm)
If you are unfamiliar with carbure-
tor adjustment techniques, ask your
dealer for advice.
Adjust the carburetor in accordance
with the following procedures.
EC7500.30
WARNING!
Figure 22
When adjusting the carburetor,
keep bystanders well away, and
make sure the cut-off wheel is
clear of any interference because
the wheel may rotate during carbu-
retor adjustment.
1. Prior to adjusting, clean the air filter
as described on the previous page
and then run the engine for a few
of minutes at idle speed to warm up
the engine.
18
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High and Low Speed Needle
The high and low speed needle is fixed
and cannot be adjusted.
Cleaning Cylinder Fins
WARNING!
Spark Plug Maintenance
Before cleaning cylinder fins, make
sure the engine is cold.
If the engine becomes hard to start or
if idle speed is unstable, inspect the
spark plug according to the following
procedures.
Dust and debris may accumulate
between the cylinder fins and can lead
to engine overheating. In order to
maintain efficient service, cylinder fins
should be cleaned once every month.
Checking the Drive Belt
The transmission belt tends to loosen
and wear after a period of operation
and should be checked and adjusted
regularly according the following
procedures. If the belt is worn, torn,
cracked, scratched or otherwise
damaged, replace it with a new one
immediately.
1. Remove the spark plug. Refer to
the procedures on page 13, If the
Engine Does Not Start…
2. Clean the electrode with a wire
brush. If necessary, adjust the
electrode gap. The gap should be
0.6mm. See Figure 24.
0.6mm
Adjusting Belt Tension
(Figure 25)
Figure 24
1. Loosen the two bolts in the belt
guard by one turn.
2. Turn the tension screw so the
washer aligns with the mark on the
clutch cover.
3. Tighten the two bolts in the belt
guard.
EC7500.34
Tension
Screw
Bolt
Mark
Belt Guard
Clutch
Cover
Washer
Figure 25
EC7500.34A
19
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Replacing the Drive Belt
Checking the Cut-off Wheel
WARNING!
1. Loosen the tension screw. Loosen
the two bolts on the belt guard and
remove the belt guard by sliding it
to the right. See Figure 26.
Never use a wheel which has
breakage, cracks or distortion.
The wheel may break while operat-
ing and may result in serious injury.
2. Loosen the two bolts in the clutch
cover and remove the clutch cover.
3. Replace the old belt with a new one.
Always check the condition of the cut-
off wheel before starting the engine.
Make sure there are no breaks, cracks
or warps. See Figure 28.
A faulty wheel must be replaced
with a new one!
Slide
forward to
remove
The tips of a diamond wheel should be
sharpened regularly to maintain cut-
ting efficiency. See page 22.
EC7500.35
Clutch
Cover
Belt Guard
Tension
Screw
Bolt
Figure 26
4. Reassemble the clutch cover and
the belt guard and adjust the belt
tension. Figure 27 illustrates the
components.
Cracks
Missing
Tips
Worn Tips
EC7500.36
EC7500.47
Distortion or Warps
Figure 27
Figure 28
20
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Replacing the Cut-off Wheel
1. Make sure the ignition switch is Off
WARNING!
and the engine is stopped.
Using the wrong size collar may
lead to failure of the wheel or the
unit and could result in serious
injury.
2. Insert a 6mm hex wrench into the
hole in the belt guard to prevent the
drive shaft from turning.
See Figure 29.
5. Remove the old wheel and install
the new one. Make sure the inner
bore is properly set onto the collar.
Replacing the Cut-off Wheel
6. Replace the outer flange and bolt,
then holding the hex wrench in the
hole of the belt guard, tighten the
bolt with the wrench.
7. Make sure the cut-off wheel is
securely fastened and does not
wobble.
EC7500.20A
Belt Guard
Hex Wrench
WARNING!
Outer
Flange
Bolt
Outer
Flange
Make sure the replacement cut-off
wheel rpm rating is greater than
the speed indicated on the wheel
guard label.
Wrench
Label Showing
Label Showing
Tighten
Rated and Maximum
Direction of
Spindle Speed
Rotation
EC7500.20
Loosen
Figure 29
3. Loosen the outer flange bolt with
the wrench and remove the bolt and
outer flange.
EC7500.42
Diamond
Wheel Guard
Wheel
4. Before mounting a cut-off wheel,
determine its arbor diameter. If nec-
essary, remove the snap ring from
the arbor, install the correct collar,
then re-install the snap ring.
CAUTION!
Make sure the rotating direction of
wheel corresponds to the one in-
dicated on the wheel guard. Make
sure there is no dust around the
outer flange.
21
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Sharpening a Diamond
Cut-off Wheel
While running the engine at low speed,
make about 10 passes at cutting a con-
crete block or a soft brick. Keep the
block watered while sharpening.
Lubricating the Clutch Bearing
Grease the clutch bearing every 20
hours of operation. Squeezing a grease
gun three times will deliver an appro-
priate amount of grease. See Figure 31.
Checking the Fuel Filter
WARNING!
EC7500.44
KEEP AWAY FROM FIRE OR
EXCESS HEAT!
1. Remove the fuel filler cap.
2. Take the filter out from the fuel
opening by using a hooked wire. If
the filter is hard and clogged with
debris, replace it with a new one.
See Figure 30.
Grease Gun
Figure 31
CAUTION!
Make sure the fuel line is not
pierced by the hooked wire. The
fuel line can be easily damaged.
Hooked Wire
Fuel Filter
Fuel Filler
Cap
Figure 30
3. Put the filter back into the fuel tank.
Make sure the fuel tube is not bent
and the filter stays at the bottom of
the tank.
4. Put the fuel filler cap back and
tighten it securely.
22
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Long Term Storage
Whenever the unit will not be used for Remove the spark plug and put a
30 days or longer, use the following
procedures to prepare if for storage:
small amount of 2-cycle mixing oil
(1-2 cm3) into the cylinder through
the spark plug hole. Slowly pull
the recoil starter 2 or 3 times so oil
will evenly coat the interior of the
engine. Reinstall the spark plug.
Clean external parts thoroughly.
Drain all the fuel from the carbure-
tor and the fuel tank.
IMPORTANT!
All stored fuels should be stabilized
with a fuel stabilizer such as StaBil™.
Before storing the unit, repair or
replace any worn or damaged parts.
Remove the air cleaner element
from the carburetor and clean it as
described on page 17, then reas-
semble the element.
To remove the remaining fuel from the
fuel lines and carburetor and with the
fuel drained from the fuel tank…
Clean the exterior of the unit thor-
oughly.
1. Prime the primer bulb until no more
fuel passes through.
Store the unit is a clean, dust-free
area.
2. Start the engine and idle until it
stops running.
3. Repeat Steps 1 and 2 until the en-
gine will no longer start.
CAUTION!
Gasoline stored in the carburetor
for extended periods can cause
hard starting and could also lead to
increased service and maintenance
costs.
23
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Troubleshooting
PROBLEM
PROBLEM
The engine does not start.
Cutting performance is poor.
Make sure the choke is �
pushed fully in.
Make sure the fuel tank contains
with clean, fresh fuel (pg 11).
Remove the spark plug (pg 13).
Make sure the air �
cleaner is clean (pg 17).
Is the spark �
plug wet?
Is the spark �
plug dry?
Make sure the cut-off wheel is
appropriate for your work.
Make sure the diamond �
wheel is sharp.
Replace the �
fuel filter �
(pg 22).
Dry the �
spark plug.
Inspect the
spark plug �
(pg 19).
Make sure the drive belt is �
properly tightened (pg 19).
Pull the recoil
starter several
times to
Make sure the carburetor is �
is properly adjusted (pg 18).
remove fuel
from the
cylinder.
If the above inspections and maintenance procedures do not �
correct the problem, contact your Shindaiwa dealer for assistance.
24
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Declaration of Conformity
DECLARATION
OF
CONFORMITY
We hereby declare the Shindaiwa Cut-off Machine,
Model EC7500 (EC7500/EC1, EC7600/EC1).
meets the following respective requirements.
Council Directives:
Standard taken:
EN 292 parts 1&2
89/336/EEC as amended
98/37/EC as amended
2000/14/EC as amended
2004/26/EC as amended
EN 1454
CISPR 12
Measured sound power level: 113dB(A)
Guaranteed sound power level: 115dB(A)
Technical documentation is kept by:
K. Maeda DIV. Manager
Engineering Research and Development DIV.
Shindaiwa Kogyo Co., Ltd.
Head office : 6-2-11, Ozuka—Nishi, Asaminami—Ku,
Hiroshima, 731—3167, Japan
TEL: 81-82-849-2003, FAX: 81-82-849-2482
19th January, 2005
Shindaiwa Kogyo Co., Ltd.
Head office : 6-2-11, Ozuka—Nishi, Asaminami—Ku,
Hiroshima, 731—3167,Japan
T. Yoshitomi
DIV. Mana
TEL: 81-82-849-2206, FAX: 81-82-849-2481
Quality Assurance DIV.
25
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Notes:
26
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Notes:
27
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Shindaiwa Inc.
11975 SW Herman Road
Tualatin, Oregon 97062
Telephone 503-692-3070
Fax
503-692-6696
Shindaiwa Kogyo Co., Ltd.
6-2-11 Ozuka-Nishi
Asaminami-Ku, Hiroshima
731-3167, Japan
Telephone 81-82-849-2220
Fax
81-82-849-2481
©2004 Shindaiwa Inc.
Part Number 68006-94310
Shindaiwa is a registered
trademark of Shindaiwa Inc.
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