Chicago Electric 66753 Guida utente

GAS HANDHELD CUT-OFF SAW

66753

SET UP, OPERATING, AND SERVICING

INSTRUCTIONS

Using an engine indoors CAN KILL YOU IN

MINUTES.

Engine exhaust contains carbon monoxide.

This is a poison you cannot see or smell.

NEVER use inside

a home or garage,

EVEN IF doors and

windows are open.

Only use OUTSIDE

and far away from

windows, doors, and

vents.

Distributed exclusively by Harbor Freight Tools®.

3491 Mission Oaks Blvd., Camarillo, CA 93011

Visit our website at: http://www.harborfreight.com

Read this material before using this product.

Failure to do so can result in serious injury.

SAVE THIS MANUAL.

contained herein may be reproduced in any shape or form without the express written consent of

Harbor Freight Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing

improvements, actual product may differ slightly from the product described herein. Tools required for

assembly and service may not be included.

For technical questions or replacement parts, please call 1-800-444-3353.

SKU 66753 For technical questions, please call 1-800-444-3353. Page 2

CONTENTS

IMPORTANT SAFETY

INFORMATION............................3

CUT-OFF SAW SAFETY

PRECAUTIONS...........................5

VIBRATION HAZARD:..................7

SPECIFICATIONS.......................... 9

UNPACKING..................................9

COMPONENTS AND CONTROLS ....9

SET UP INSTRUCTIONS.............10

ASSEMBLY.......................................10

ABRASIVE BLADE RING TEST. 11

INSTALLING THE BLADE..........11

FILLING THE FUEL TANK .........12

OPERATING INSTRUCTIONS ....12

STARTING THE ENGINE.................12

BREAK-IN PERIOD ....................13

CUTTING TECHNIQUE...............14

SERVICING.................................. 15

MAINTENANCE PROCEDURES.....15

COOLING SYSTEM....................15

AIR FILTER ELEMENT

MAINTENANCE .......................16

SPARK PLUG MAINTENANCE..16

FUEL FILTER REPLACEMENT..17

CLEANING, MAINTENANCE, AND

LUBRICATION SCHEDULE..........18

WEEKLY MAINTENANCE:.........18

MONTHLY MAINTENANCE:.......18

STORAGE ........................................18

TROUBLESHOOTING......................19

PARTS LISTS AND DIAGRAMS . 21

DRIVE SYSTEM PARTS LIST &

DIAGRAM ......................................21

BLADE GUARD ASSEMBLY

PARTS LIST & DIAGRAM.............22

FLANGE ASSEMBLY PARTS LIST

& DIAGRAM...................................23

CLUTCH ASSEMBLY PARTS LIST

& DIAGRAM...................................24

HANDLE ASSEMBLY PARTS LIST

& DIAGRAM...................................24

CONTROL SYSTEM PARTS LIST

& DIAGRAM...................................25

AIR FILTER ASSEMBLY PARTS

LIST & DIAGRAM..........................26

CARBURETOR ASSEMBLY

PARTS LIST & DIAGRAM.............27

RECOIL ASSEMBLY PARTS LIST

& DIAGRAM...................................28

IGNITION ASSEMBLY PARTS

LIST & DIAGRAM..........................29

CYLINDER ASSEMBLY PARTS

LIST & DIAGRAM..........................30

MUFFLER ASSEMBLY PARTS

LIST & DIAGRAM..........................31

CRANKSHAFT ASSEMBLY

PARTS LIST & DIAGRAM.............32

CRANKCASE ASSEMBLY PARTS

LIST & DIAGRAM..........................33

WET CUTTING KIT PARTS LIST &

DIAGRAM ......................................34

LIMITED 90 DAY WARRANTY.... 35

EMISSION CONTROL SYSTEM

WARRANTY .............................. 35

SKU 66753 For technical questions, please call 1-800-444-3353. Page 3

SAVE THIS MANUAL

Keep this manual for the safety warn-

ings and precautions, assembly, operat-

ing, inspection, maintenance and cleaning

procedures. Write the product’s serial

number in the back of the manual near the

assembly diagram (or month and year of

purchase if product has no number). Keep

this manual and the receipt in a safe and

dry place for future reference.

IMPORTANT SAFETY

INFORMATION

In this manual, on the labeling,

and all other information

provided with this product:

This is the safety alert

symbol. It is used to alert

you to potential personal

injury hazards. Obey all

safety messages that

follow this symbol to avoid

possible injury or death.

DANGER indicates

a hazardous

situation which, if not

avoided, will result in death or

serious injury.

WARNING

indicates a

hazardous situation which, if

not avoided, could result in

death or serious injury.

CAUTION, used

with the safety

alert symbol, indicates a

hazardous situation which, if

not avoided, could result in

minor or moderate injury.

NOTICE is used to

address practices

not related to personal injury.

CAUTION, without

the safety alert

symbol, is used to address

practices not related to

personal injury.

WARNING! Read all instructions.

Failure to follow all instructions

listed below may result in re,

serious injury and/or DEATH.

The warnings and precautions

discussed in this manual cannot

cover all possible conditions and

situations that may occur. It must

be understood by the operator that

common sense and caution are

factors which cannot be built into

this product, but must be supplied

by the operator.

SAVE THESE INSTRUCTIONS

SET UP PRECAUTIONS

Gasoline fuel and fumes are amma-1. ble, and potentially explosive. Use

proper fuel storage and handling pro-

cedures. Do not store fuel or other

ammable materials nearby.

Have multiple ABC class re extin-2. guishers nearby.

Operation of this equipment may cre-3.

ate sparks that can start res around

dry vegetation.

A spark arrestor may be required.

The operator should contact local re

agencies for laws or regulations relat-

ing to re prevention requirements.

Set up and use only on a at, level, 4. well-ventilated surface.

SKU 66753 For technical questions, please call 1-800-444-3353. Page 4

Wear ANSI-approved safety goggles,5. heavy-duty work gloves, and dust

mask/respirator during set up.

Use only oil and fuel recommended6.

in the “Specications” section of this

manual.

OPERATING PRECAUTIONS

1. CARBON MONOXIDE

HAZARD

Using an engine indoors

CAN KILL YOU IN

MINUTES.

Engine exhaust contains carbon

monoxide. This is a poison you

cannot see or smell.

NEVER use inside a home or garage,

EVEN IF doors and windows are

open.

Only use OUTSIDE and far away

from windows, doors, and vents.

Keep children away from the equip-2. ment, especially while it is operating.

Do not leave the equipment unat-3. tended when it is running. Turn off

the equipment (and remove safety

keys, if available) before leaving the

work area.

Wear ANSI-approved safety goggles4. and hearing protection during use.

People with pacemakers should5. consult their physician(s) before

use. Electromagnetic elds in close

proximity to a heart pacemaker could

cause pacemaker interference or

pacemaker failure. Caution is neces-

sary when near the engine’s magneto

or recoil starter.

Use only accessories that are recom-6. mended by Harbor Freight Tools for

your model. Accessories that may be

suitable for one piece of equipment

may become hazardous when used

on another piece of equipment.

Do not operate in explosive atmo-7. spheres, such as in the presence of

ammable liquids, gases, or dust.

Gasoline-powered engines may ignite

the dust or fumes.

Stay alert, watch what you are doing8. and use common sense when operat-

ing this piece of equipment. Do not

use this piece of equipment while

tired or under the inuence of drugs,

alcohol or medication.

Do not overreach. Keep proper foot-9. ing and balance at all times. This en-

ables better control of the equipment

in unexpected situations.

Use this equipment with both hands10. only. Using equipment with only

one hand can easily result in loss of

control.

Dress properly. Do not wear loose11. clothing or jewelry. Keep hair, cloth-

ing and gloves away from moving

parts. Loose clothes, jewelry or long

hair can be caught in moving parts.

Parts, especially exhaust system12. components, get very hot during use.

Stay clear of hot parts.

SKU 66753 For technical questions, please call 1-800-444-3353. Page 5

Do not cover the engine or equipment13. during operation.

Keep the equipment, engine, and sur-14. rounding area clean at all times.

Use the equipment, accessories, etc.,15. in accordance with these instructions

and in the manner intended for the

particular type of equipment, taking

into account the working conditions

and the work to be performed. Use

of the equipment for operations differ-

ent from those intended could result

in a hazardous situation.

Do not operate the equipment with16. known leaks in the engine’s fuel sys-

tem.

This product contains or, when used,17. produces a chemical known to the

State of California to cause cancer

and birth defects or other reproduc-

tive harm. (California Health & Safety

Code § 25249.5, et seq.)

When spills of fuel or oil occur, they18. must be cleaned up immediately.

Dispose of uids and cleaning materi-

als as per any local, state, or federal

codes and regulations. Store oil rags

in a bottom-ventilated, covered, metal

container.

Keep hands and feet away from19. moving parts. Do not reach over or

across equipment while operating.

Before use, check for misalignment20. or binding of moving parts, breakage

of parts, and any other condition that

may affect the equipment’s operation.

If damaged, have the equipment

serviced before using. Many ac-

cidents are caused by poorly main-

tained equipment.

Use the correct equipment for the21. application. Do not modify the equip-

ment and do not use the equipment

for a purpose for which it is not in-

tended.

CUT-OFF SAW SAFETY

PRECAUTIONS

Never use carbide-tipped, woodcut-1. ting, or circular machine Saw Blades.

They can cause severe personal

injury from reactive forces, blade con-

tact, or thrown objects.

Only cut asphalt, concrete, stone,2. brick, and plastics with this Cut Off

Saw.

Inspect the Saw Blade frequently,3. and replace immediately if the Blade

is cracked, or warped. Cracked or

warped Saw Blades may shatter or

break and cause serious personal

injury.

Always install the Saw Blade so4. that the arrow on the Blade points

in the direction of the rotation of

the spindle.

Keep hands and ngers away from 5. the cutting area and Saw Blade.

Never attempt to cut more than6. one workpiece at a time.

When cutting a large workpiece,7. make sure its entire length is prop-

erly supported. If necessary, use a

roller stand (not included).

Allow the Saw Blade to spin up to8. full speed before feeding it into a

workpiece. When turning off the Cut

Off Saw, allow the Saw Blade to spin

down and stop on its own. Do not

SKU 66753 For technical questions, please call 1-800-444-3353. Page 6

press against the Saw Blade to stop

it.

Do not force the Saw Blade into9. the workpiece when cutting. Apply

moderate pressure, allowing the Saw

Blade to cut without being forced.

To avoid accidental injury, always10. wear heavy duty work gloves when

changing the Saw Blade.

The Saw Blade will become hot11. while cutting. Allow the Saw Blade

to completely cool before handling.

Turn off the Cut Off Saw and allow12. the Saw Blade to completely stop

if the Saw Blade is to be backed

out of an uncompleted cut.

Never attempt to remove material13. stuck in the Cut Off Saw while it is

operating.

Always use the water cooling14. system when cutting concrete to

avoid inhalation of dangerous dust

particles.

Make sure the workpiece is free15. from nails, metal rebar, and any

other foreign objects that could

damage the Saw Blade or cause

“kickback”.

Causes and operator prevention16. of “kickback”: Kickback is a sud-

den reaction to a pinched, bound, or

misaligned Saw Blade, causing an

uncontrolled Cut Off Saw to lift up

and out from the workpiece toward

the operator. When the Saw Blade

is pinched or bound tightly by the cut

closing down, the Saw Blade stalls

and the engine reaction drives the

Cut Off Saw rapidly back toward the

operator. If the Saw Blade becomes

twisted or misaligned in the cut, the

teeth at the back edge of the Saw

Blade can raise the Cut Off Saw

(walk up) toward the operator. Kick-

back is a result of tool misuse and/

or incorrect operating procedures or

conditions and can be avoided by

taking proper precautions as given

below:

Maintain control of the Cut Off• Saw at all times. Never allow the

rotating Saw Blade to rest on the

workpiece without holding on to the

Saw with both hands.

When the Saw Blade is binding,• or when interrupting a cut for

any reason, turn off the Cut Off

Saw and hold the Saw motion-

less until the Saw Blade comes

to a complete stop. Never attempt

to remove the Saw Blade from the

workpiece or pull the Saw backward

while the Saw Blade is in motion or

kickback may occur. Investigate and

take corrective actions to eliminate

the cause of Saw Blade binding.

When restarting the Cut Off Saw• on a workpiece, center the Saw

Blade in the pre-cut opening and

check that the Saw Teeth are not

engaged into the workpiece. If the

Saw Blade is binding, the Cut Off

Saw may walk up or kickback as the

Saw is restarted.

Support large panels with roller• stands (not included) to minimize

the risk of Saw Blade pinching

and kickback. Large panels tend

to sag under their own weight. Sup-

ports must be placed under the

panel and near the outer edge of the

panel.

SKU 66753 For technical questions, please call 1-800-444-3353. Page 7

Do not use a dull or damaged Saw• Blade. Unsharpened or improperly

installed Saw Blades produce a nar-

row cut causing excessive friction,

Saw Blade binding and kickback.

Push the Saw Blade past the• workpiece prior to release.

Make sure to check the Blade• Guard for proper operation. Never

disable the Guard. Do not use the

Cut Off Saw if the Guard assembly

does not operate properly. Before

each use, make sure the Blade

Guard does not touch the Saw

Blade.

Vibration Hazard:

This tool vibrates during use. Re-

peated or long-term exposure to

vibration may cause temporary or

permanent physical injury, particularly

to the hands, arms and shoulders. To

reduce the risk of vibration-related

injury:

Anyone using vibrating tools regu-1. larly or for an extended period should

rst be examined by a doctor and

then have regular medical check-

ups to ensure medical problems are

not being caused or worsened from

use. Pregnant women or people

who have impaired blood circulation

to the hand, past hand injuries, ner-

vous system disorders, diabetes, or

Raynaud’s Disease should not use

this tool. If you feel any symptoms

related to vibration (such as tingling,

numbness, and white or blue ngers),

seek medical advice as soon as pos-

sible.

Do not smoke during use. Nico-2. tine reduces the blood supply to the

hands and ngers, increasing the risk

of vibration-related injury.

Wear suitable gloves to reduce the3. vibration effects on the user.

Use tools with the lowest vibration4. when there is a choice between dif-

ferent processes.

Include vibration-free periods each5. day of work.

Grip tool as lightly as possible (while6. still keeping safe control of it). Let

the tool do the work.

To reduce vibration, maintain the tool7. as explained in this manual. If any

abnormal vibration occurs, stop use

immediately.

SERVICE PRECAUTIONS

Before service, maintenance, or1. cleaning:

Turn the ON/OFF switch to itsa. “OFF” position.

Allow the engine to completelyb. cool.

Then, remove the spark plugc. wire(s) from the spark plug(s).

Keep all safety guards in place and in2. proper working order. Safety guards

include mufer, air cleaner, mechani-

cal guards, and heat shields, among

other guards.

Do not alter or adjust any part of3. the equipment or its engine that is

sealed by the manufacturer or dis-

tributor. Only a qualied service

technician may adjust parts that

may increase or decrease gov-

erned engine speed.

SKU 66753 For technical questions, please call 1-800-444-3353. Page 8

Wear ANSI-approved safety goggles,4. heavy-duty work gloves, and dust

mask/respirator during service.

Maintain labels and nameplates on5. the equipment. These carry impor-

tant information. If unreadable or

missing, contact Harbor Freight Tools

for a replacement.

Have the equipment serviced by a6.

qualied repair person using only

identical replacement parts. This will

ensure that the safety of the equip-

ment is maintained. Do not attempt

any service or maintenance proce-

dures not explained in this manual

or any procedures that you are un-

certain about your ability to perform

safely or correctly.

Store equipment out of the reach of7. children.

Follow scheduled engine and equip-8. ment maintenance.

Refueling Precautions:9.

Do not smoke, or allow sparks,a.

ames, or other sources of ignition

around the equipment, especially

when refuelling.

Do not rell the fuel tank while the b. engine is running or hot.

Do not ll fuel tank to the top. Leave c. a little room for the fuel to expand as

needed.

Refuel in a well-ventilated area only.d. SAVE THESE

INSTRUCTIONS.

SKU 66753 For technical questions, please call 1-800-444-3353. Page 9

SPECIFICATIONS

Engine

Type 2 Stroke, air cooled

Rating 4.7 horsepower

Start Recoil

Bore x Stroke 1.89” x 1.34”

Compression Ratio 7.5:1

Displacement 61.5 cc

Sound Level 105 dB @ 3 ft.

Fuel

Type 90+octane unleaded

gasoline/2-cycle oil

Fuel/Oil Ratio 40:1

Capacity 0.7 L (0.18 Gallons)

Spark Plug Type NGK - BPMR7A

TORCH - L6RTC

Gap 0.02” (0.5mm)

Speed Idle 2600 RPM

No Load 9500 RPM

Blade

(not

included)

Size 14” dia.

7/64” to 1/4” thick

Arbor 1” / 20 mm

Max. Cutting Depth 4-1/2”

Belt SPZ 900

Air Filter Prelter (Foam)

Paper Cartridge

Flocked Aux.

Note: Additional specications found in

the TECHNICAL ENGINE SPECIFI-

CATIONS chart in this manual.

The emission control system for this

Saw’s Engine is warranted for standards

set by the U.S. Environmental Protection

Agency and by the California Air Resourc-

es Board (also known as CARB). For war-

ranty information, refer to the last pages of

this manual.

At high altitudes, the engine’s carbu-

retor, governor (if so equipped), and any

other parts that control the fuel-air ratio will

need to be adjusted by a qualied me-

chanic to allow efcient high-altitude use

and to prevent damage to the engine and

any other devices used with this product.

UNPACKING

When unpacking, make sure that the

item is intact and undamaged. If any parts

are missing or broken, please call Harbor

Freight Tools at 1-800-444-3353 as soon

as possible.

Components and Controls

Figure 1

Front Handle (8E)

Air Filter Cover (5G)

Trigger

Safety Lever

Gas Cap (17F)

Starter

Cover (4I)

Blade

Belt Guard (7A)

Choke (6H)

Decompression

Valve (13K)

ON/OFF

Switch (14G)

Trigger (7F)

Water Valve (3O)

Starter

Handle (13I)

Blade

Guard

(7B)

Blade Guard

Adjustment

Handle (8B)

Trigger

Locking

Button

Quick Connect

Hose Fitting (5O)

SKU 66753 For technical questions, please call 1-800-444-3353. Page 10

SET UP INSTRUCTIONS

Read the ENTIRE IMPORTANT

SAFETY INFORMATION

section at the beginning of this

manual including all text under

subheadings therein before set

up or use of this product.

TO PREVENT

SERIOUS INJURY

FROM ACCIDENTAL

STARTING:

Turn the Power Switch of the

equipment to its “OFF”

position, wait for the engine to

cool, and disconnect the

spark plug wire(s) before

assembling or making any

adjustments to the equipment.

TO PREVENT

SERIOUS INJURY:

Operate only with proper

spark arrestor installed.

Operation of this equipment

may create sparks that

can start res around dry

vegetation.

A spark arrestor may be

required.

The operator should contact

local re agencies for laws

or regulations relating to re

prevention requirements.

Note: For additional information regarding

the parts listed in the following pages,

refer to the Parts Lists and Assembly

Diagrams near the end of this

manual.

Assembly

Abrasive

Blade Diamond

Blade

Figure 2

Cutting blades are available in two

standard designs: abrasive blades

and diamond blades. Before using

any blade, check it for damage. Use

the ring-test, described in next sec-

tion, for abrasive blades and check

diamond blades for bent or damaged

anges or accumulated dirt.

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