McCulloch MCT3362VA, 9096336202, 966992201 User Manual

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USER MANUAL

Gas String Trimmer

Model : MCT3362VA

SAFETY OPERATION MAINTENANCE

For your own safety please read this manual before attempting to operate your new unit. Failure to follow instructions can result in serious personal injury. Spend a few moments to familiarize yourself with your trimmer before each use.

PN 9096-336202 Printed in China

WARNING • PLEASE READ

INTRODUCTION 1 - GENERAL INFORMATION

PLEASE READ

Dear Customer, Thank you for purchasing a McCulloch product. With prop-

er operation and maintenance, it will provide you with years of service.

In order to make the best use of your investment, be CER-

TAIN to familiarize yourself with the contents of the ENTIRE user manual before attempting to operate and

maintain your unit. Be sure to carefully follow the step-by-step instructions in

this manual to start, operate and maintain your new product.

In the manual there will be the following call-outs: NOTE:, WARNING / CAUTION and WARRANTY.

A NOTE: is used to convey additional information, to high- light a particular explanation, or to expand a description.

A WARNING or CAUTION identifies a procedure which, if not undertaken or if improperly done, can result in serious personal injury and/or damage to the unit.

The (WARRANTY SYMBOL) serves notice that unless instructions or procedures are followed, any damage caused will void the warranty and repairs will be at owner’s expense.

Pay particular attention to the safety precautions. They are written for your protection and contain important information you must know to safely operate your trimmer.

FOR WARRANTY OR SERVICE CONTACT THE NEAREST

McCULLOCH AUTHORIZED SERVICE CENTER - LOCATE

YOUR NEAREST SERVICE CENTER BY CALLING THE

TOLL FREE NUMBER IN THIS MANUAL.

TABLE OF CONTENTS

1 GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . .2

1-1. General Identification 1-2. Safety Features 1-3. Specifications

SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

2-1. What To Do 2-2. What Not To Do 2-3. International Symbols

3 ASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . .6

3-1. “P” Handle Assembly 3-2. Debris Shield

4 FUEL AND LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . .8

4-1. Fuel 4-2. Mixing Fuel 4-3. Fuel Mixing Table 4-4. Recommended Fuels 4-5. Fuel and Lubrication Symbols

5 OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . .9

5-1. Starting a Cold Engine 5-3. To Stop Engine 5-2. Warm Engine Start 5-4. Idling/Carburetor Adjustment

6 TRIMMING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . .11

6-1. Additional Safety Precautions 6-2. Stringhead Line Release 6-3. Trimming Procedures

7 MAINTENANCE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . .13

7-1. Replacing Cutter Line 7-2. Air Filter 7-3. Fuel Cap / Fuel Filter 7-4. Carburetor Adjustment

k Plug

Spar

7-5. 7-6. Spark Arrester Screen 7-7. Debris Shield Knife Sharpening 7-8. Storing a Unit 7-9. Removing a Unit From Storage

8 TROUBLESHOOTING THE ENGINE . . . . . . . . . . . . . . . . . .17

9 TROUBLESHOOTING THE STRINGHEAD . . . . . . . . . . . . .18

10 ONE YEAR LIMITED WARRANTY . . . . . . . . . . . . . . . . . . .19

1-1. GENERAL IDENTIFICATION

UMP FEED HEAD*

1. CUTTING LINE

3. DEBRIS SHIELD* DRIVE SHAFT ASSEMBL

4. P-HANDLE

6. THROTTLE TRIGGER IGNITION ON/OFF SWITCH

7. SAFETY

9. CHOKE LEVER FUEL TANK

10.

11.

AIR FIL

TER CO

12. STARTER HANDLE MUFFLER SHIELD

13. PRIMER B

14.

15. SPARK ARRESTER SCREEN*

16. DEBRIS SHIELD HARDWARE

TE:

* items are w

DO NO

ear/m

TRIGGER

VER

ULB

T use b

lades on these models.

1-2. SAFETY FEATURES

Numbers preceding the descriptions correspond to numbers above to help you locate the safety feature.

3 DEBRIS SHIELD m

from being thrown at the user and prevent the string from extending longer than necessary.

13 MUFFLER SHIELD helps prevent hands, body and/or

combustible materials from making contact with a hot muffler.

15 SPARK ARRESTER SCREEN retains carbon and

other flammab

xhaust flo

from e

NOTE: Compliance with local, state and federal laws and/or regulations governing the use of a spark arrester screen is the user’s responsibility. See Safety Precautions (Section 3) and Maintenance Instructions (Section 8) for additional information.

ust be installed to prevent debris

le particles over 0.023" (.6 mm) in size

2 3

1 - GENERAL INFORMATION

2 - SAFETY PRECAUTIONS

1-3. SPECIFICATIONS

Engine Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Air-cooled, 2-Cycle, Chrome Cylinder

Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26cc / 1.8ci

Dry Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10.78 lbs. / 4.9 kg

Fuel Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .550 ml

Drive Shaft Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52” (132cm)

Cutting Swath . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17" / 43cm

Handle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .“P” Handle

Carburetor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Primer / Diaphragm Type

Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Electronic

Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Clutch

Maximum Engine Performance . . . . . . . . . . . . . . . . . . . . . . . . . .0.78 kW

Maximum RPMS at Wide Open Throttle . . . . . . . . . . . . . . . .7600 min

Idle Speed With no Stringhead Movement . . . . . . . . . . . . . . . . .3000±300 min

4 5

-1

2-1. WHAT TO DO

READ (IF ANY ENCLOSED) THOROUGHLY BEFORE OPERATING YOUR UNIT.

1. CLOTHING - Always wear heavy, long pants, boots,

2 FUELING - Mix and pour fuel outdoors where there

3. COMPLY WITH ALL FIRE PREVENTION REGULA-

4. TURN UNIT OFF before setting it down.

5. ALWAYS HOLD UNIT FIRMLY WITH BOTH HANDS,

6. KEEP ALL SCREWS AND FASTENERS TIGHT.

7. KEEP HANDLES DRY, clean and free of fuel mixture.

8. KEEP STRINGHEAD AS CLOSE TO GROUND AS

9. CHECK AREA YOU WILL BE TRIMMING FOR

10. KEEP ALL PARTS OF YOUR BODY AND CLOTHING

11. STOP ENGINE before examining cutting line.

12.

13. ALWAYS KEEP the debris shield, stringhead, and

14.

YOUR USER MANUAL AND ALL SUPPLEMENTS

gloves and long sleeve shirt. Do not wear loose clothing, jewelry, short pants, sandals, or go barefoot. Secure hair so it is at shoulder level. Always wear a hard hat, a safety face shield, or safety glasses for eye protection and a good grade of ear plugs or other sound barriers for hearing protection.

are no sparks and flames. Slowly remove the fuel cap only after stopping the engine. Do not smoke while fueling or mixing fuel. Wipe spilled fuel from the unit. Move at least 30 ft (9m) away from the fueling source (gas can) and site before starting unit.

TIONS. COMPLIANCE WITH ALL LOCAL, STATE, OR FEDERAL LAWS IN THE UNITED STATES IS THE USER’S RESPONSIBILITY. Your unit comes with a spark arrester screen. Replacement spark arrester screen kits are available at your nearest McCulloch Authorized Service Center listed under “SAWS” in your Telephone Directory Yellow Pages.

the thumb and fingers encircling the handles.

Never operate this equipment if it is improperly adjusted or not completely and securely assembled.

PRACTICAL. Avoid hitting small objects with string-

ing

ered w

w str

ys be

ater

When cutting on a slope

head. head.

DEBRIS that may be struck or thrown during operation.

AWAY FROM STRINGHEAD when starting or running

ore star

Bef

engine will not come in contact with any obstacle.

STORE EQUIPMENT AWAY FROM POSSIBLE IGNITION SOURCES heaters, clothes dryers, or oil-fired furnaces, portable heaters, etc.

engine free of debris build-up. OPERA

restricted to mature and properly instructed individuals

TION OF EQ

ting engine, make sure stringhead

, such as gas-po

UIPMENT should alw

, stand belo

2-2. WHAT NOT TO DO

2. DO NOT SMOKE while refueling or operating equip-

3. DO NOT OPERATE UNIT WITHOUT A MUFFLER

4. DO NOT TOUCH or let your hands or body come in

5. DO NOT OPERATE UNIT IN AWKWARD POSI-

6. DO NOT RAISE STRINGHEAD above ground level

7. DO NOT USE UNIT FOR ANY PURPOSES OTHER

8. DO NOT OPERATE UNIT FOR PROLONGED PERI-

9. DO NOT OPERATE UNIT WHEN TIRED, ILL OR

10. DO NOT OPERATE UNIT UNLESS DEBRIS SHIELD

11. DO NOT ADD, REMOVE OR ALTER ANY COM-

12. DO NOT operate your unit near or around flammable

13.

DO NOT USE ANY OTHER FUEL than that rec-

ommended in your manual. Always follow instructions in the Fuel and Lubrication section of this manual. Never use gasoline unless it is properly mixed with 2-cycle engine lubricant. Permanent damage to engine will result, voiding manufacturer’s warranty.

ment.

and properly installed muffler shield.

contact with a hot muffler or spark plug wire.

TIONS, off balance, outstretched arms, or one-handed. Always use two hands when operating unit with thumbs and fingers encircling the handles.

while unit is operating. Injury to operator could result.

than trimming lawn or garden areas.

ODS. Rest periodically.

UNDER THE INFLUENCE OF ALCOHOL OR DRUGS OR MEDICATION.

AND/OR GUARD IS INSTALLED AND IN GOOD CONDITION.

PONENTS OF THIS PRODUCT. Doing so could cause personal injur the manufacturer’s warranty.

liquids or gases whether in or out of doors. An explosion and/or fire ma inside a closed room or building, breathing exhaust fumes can kill.

DO NO

MENT. Use only Genuine McCulloch replacement par specifically to enhance the perf mize the safe operation of our products. Failure to do so ma Use only the str

not use any other cutting attachment. Use of such

hments will v

attac

could result in ser

T USE ANY O

ts and accessor

y cause poor perf

y and/or damage the unit v

y result. Never start or run the unit

THER CUTTING A

, which are designed

ies

mance and maxi

ormance and possible injury.

inghead supplied with this product.

oid your factory warranty

ious bodily injur

oiding

and

2 - SAFETY PRECAUTIONS 3 - ASSEMBLY INSTRUCTIONS

2-3. INTERNATIONAL SYMBOLS

Minimum operating distance

Use of these personal safety items is highly recommended to reduce the risk of accidental injury.

Read the User Manual.

Do not use blade on this unit.

3-1. “P” HANDLE ASSEMBLY

1. To install handle onto unit, you will need the following components from your user kit: “P” handle (A & B), screws (C) and nuts (D). (Figure 3-1).

2. Install the handle (B) on the shaft 6.0” to 7.87” (160200mm) from throttle and tighten the 2 screws (C) and nuts (D).

3-1A

3-2. DEBRIS SHIELD

3-2B

Pump the primer bulb 10 times.

WARNING

The debris shield must be installed (Figure 3-2A) to properly dispense cutter line and protect operator. Shield fits snug on shaft. Some force may be required.

1. Seat shield (A) onto shaft bracket (B). (Fig. 3-2A)

2. Insert bolt (C), washer (D), lock washer (E) and wing nut (F), tighten securely. (Fig. 3-2B)

3-2A

6 7

4 - FUEL AND LUBRICATION

5 - OPERATING INSTRUCTIONS

4-1. FUEL

Use regular grade unleaded gasoline mixed with Genuine McCulloch 40:1 2-cycle engine oil for best results. Use mix-

atios in Section 5-3.

ing r

Never use straight gasoline in your unit. This will

cause permanent engine damage and void the manufacturer’s warranty for that product. Never use a fuel mixture that has been stored for over 90 days.

If 2-cycle lubricant other than Genuine McCulloch

Lubricant is to be used, it must be a premium grade oil for 2-cycle air cooled engines mixed at a 40:1 ratio. Do not use any 2-cycle oil product with a recommended mixing ratio of 100:1. If insufficient lubrication is the cause of engine damage, it voids the manufacturer’s engine warranty.

4-2. MIXING FUEL

Add oil to an approved fuel container followed by the gasoline to allow incoming gasoline to mix with oil. Shake container to ensure thorough mix.

Lack of lubrication voids engine warranty. Gasoline

and oil must be mixed at 40:1.

4-3. FUEL MIXING TABLE

GASOLINE

McCulloch 40:1 Ratio

Lubricant

1 U.S. Gal. 3.2 oz. 95ml (cc)

4-4. RECOMMENDED FUELS

Some con genates such as alcohol or an ether compound to meet clean air standards operate satisfactorily on any gasoline intended for automotive use including oxygenated gasolines.

ventional gasolines are being blended with oxy-

. Your McCulloch engine is designed to

4-5. FUEL AND LUBRICATION SYMBOLS

Gasoline and Oil Mix 40:1

5-1. STARTING A COLD ENGINE

NOTE: To minimize load on engine during starting and

arm-up, trim excess cutting line to 5” (13cm) (Fig. 5-1A).

1. Move ignition switch to the “RUN (I)” position (Fig. 51B).

2. Your unit is designed with a 3 position choke: CHOKE “ ”, START “ ”, and RUN “ ”. Move choke lever to CHOKE “ ” position (Fig. 5-1C).

3. Prime the carburetor. Pump the primer bulb (A) 10 times (Fig. 5-1D).

4. Grip handle firmly – depress safety trigger (B) & throttle trigger (C) to the FULL THROTTLE position (Fig. 51E).

5. Pull starter rope until resistance is felt (about 4”) (Fig. 5-1F). A smooth rapid pull is required for a strong spark. Pull starter rope briskly 4 times.

6. Move choke lever to START “ ” position (Fig. 5-1G).

7. Pull starter rope again 4 times while trigger is in the full throttle position.

8. Once engine starts, leave in the START “ ” position for 10 seconds.

9. Move the choke to RUN “ ” position (Fig. 5-1H).

10. If engine fails to start, repeat steps 1 through 9.

NOTE: If engine fails to start after repeated attempts, refer to trouble shooting section. NOTE: Always pull starter rope straight out. Pulling starter at an angle will cause rope to rub against the eyelet. This friction will cause the rope to fray and wear more quickly. Always hold starter handle when rope retracts. Never allow rope to snap back from extended position.This could cause rope to snag or fray and also damage the starter assembly.

5-1C

5-1D

5-1E

5-1F

5 Liters 4.3 oz. 125ml (cc) 1 lmp. Gal. 4.3 oz. 125ml (cc)

Mixing

Procedure

40 Parts Gasoline to

1 Part Lubricant

1ml=1cc

5" (13cm)

5-1A

5-1B

8 9

5-1G

5-1H

5 - OPERATING INSTRUCTIONS

6 - TRIMMING INSTRUCTIONS

5-2. WARM ENGINE START

1. Move ignition switch to the “RUN (I)” position.

2. Place choke in START “ ” position (Fig. 5-2).

3. Grasp throttle handle firmly, squeeze throttle trigger to FULL position.

4. Pull starter rope briskly until engine starts, but no more than 6 times. Keep throttle at FULL position until engine runs smoothly.

5. If engine does not start, place choke in RUN “ ” position and pull starter rope 5 more times. If engine still does not start it is probably flooded. Wait 5 minutes and repeat procedure with choke in RUN “ ” position and throttle full open.

5-2

5-3. TO STOP ENGINE

Release throttle trigger. Let engine return to idle. Move switch to “STOP” position. (Fig. 5-3)

5-3

5-4. IDLING/CARBURETOR ADJUSTMENT

1. Occasionally, due to atmospheric conditions such as altitude it might be necessary to make slight adjustment to idle speed.

2. Insert phillips or flat screwdriver into access hole A (figure 5-4A). Turn 1/8 turn clockwise to increase idle speed and 1/8 turn counterclockwise to decrease idle speed. WARNING: String head should not move at idle.

6-4A

6-1. ADDITIONAL SAFETY PRECAUTIONS

ore operating your unit, review ALL SAFETY PRECAU-

Bef TIONS in this manual.

WARNING / CAUTION

• IF UNFAMILIAR WITH TRIMMING techniques, practice the procedures with ENGINE in “OFF” position.

• ALWAYS CLEAR WORK area of debris such as cans, bottles, rocks, etc. Striking objects can cause serious injury to operator or bystanders and also damage equipment. If an object is accidentally hit, immediately TURN ENGINE OFF and examine equipment. Never operate unit with damaged or defective equipment.

• ALWAYS TRIM OR CUT AT HIGH ENGINE SPEEDS. Do not run engine slowly at start or during trimming operations.

• DO NOT use equipment for purposes other than trimming or mowing weeds.

• NEVER raise stringhead above knee height during operation.

• DO NOT operate unit with other people or animals in the immediate vicinity. Allow a minimum of 50 feet (15 meters) between operator and other people and animals when trimming or mowing. Allow a distance of 100 feet (30 meters) between operator and other people and animals when SCALPING with stringhead cutter.

• IF OPERATING UNIT ON A SLOPE, stand below the cutting attachment. DO NOT OPERATE on a slope or hilly incline if there is the slightest chance of slipping or losing your footing.

6-2. STRINGHEAD LINE RELEASE

WARNING / CAUTION

DO NOT use steel wire or plastic-coated steel wire of any

ious operator injury can

kind with y result. To release fresh line, run engine at full throttle and “bump”

inghead against la

str The knif

our str

e in debr

inghead.

wn.

is shield will tr

Ser

Line will automatically release

xcess line (Figure 6-2A).

im e

CAUTION

Be sure engine is off and string head has stopped before attempting to remove weeds wrapped around the shaft.

iodically w

P need to be removed or they will prevent the shaft from being properly cooled and could result in damage. Use a sharp object like a screw driver to remove them. (Fig. 6-2B)

eeds will wrap around the shaft. They will

BUMP

6-2A

6-2B

6-3. TRIMMING PROCEDURES

When properly equipped with a debris shield and stringhead, your unit will trim weeds and tall grass in those hardto-reach areas - along fences, walls, foundations and around trees. It can also be used for scalping to remove vegetation down to the ground for easier preparation of a garden or to clean out a particular area. NOTE: Trimming around foundations, brick or stone walls, curves, etc., will result in above normal string wear.

TRIMMING / MOWING

Swing trimmer from side to side. Do not tilt the stringhead during the procedure. Test area to be trimmed for proper cutting height. Keep stringhead at same level for even depth of cut (Figure 6-3A).

10 11

6-3A

6 - TRIMMING INSTRUCTIONS

7 - MAINTENANCE INSTRUCTIONS

CLOSER TRIMMING

osition trimmer straight ahead with a slight tilt so bottom

P of stringhead is above ground level and string contact occurs at proper cutting point. Always cut away from operator. Do not pull trimmer in toward operator.

FENCE / FOUNDATION TRIMMING

Approach trimming around chain link fences, picket fences, rock walls and foundations slowly to cut close without whipping string against the barrier. If the string comes in contact with rock, brick walls, or foundations, it will break or fray. If string snags fencing, it will snap off.

TRIMMING AROUND TREES

Trim around tree trunks with a slow approach so string does not contact bark. Walk around the tree trimming from left to right. Approach grass or weeds with the tip of the string and tilt stringhead slightly forward.

WARNING

Use extreme caution when SCALPING. Keep a distance of 100 feet (30 meters) between operator, other people and animals during these operations.

SCALPING

Scalping refers to removal of all vegetation down to the ground. To do this, tilt the stringhead to about a 30 degree angle to the left. By adjusting the handle you will have better control during this operation. Do not attempt this procedure if there is any chance flying debris could injure operator, other people or cause damage to property (Figure 63B).

WARNING

DO NOT SWEEP WITH TRIMMER

Sweeping refers to tilting stringhead to sweep away debris from walkways, etc. Your trimmer is a powerful tool and small stones or other such debris may be hurled 50 feet (15 meters) or more, causing injury or damage to nearby property such as automobiles, homes and windows.

MAINTENANCE CHECKLIST

CH USE

ITEM ACTION 10 20

SCREWS / NUTS / BOLTS INSPECT / TIGHTEN

AIR FILTER CLEAN OR REPLACE

FUEL FILTER REPLACE

SPARK PLUG CLEAN / ADJUST / REPLACE

SPARK ARRESTER SCREEN CLEAN OR REPLACE

INSPECT

FUEL HOSES

*REPLACE AS REQUIRED

INSPECT

STRINGHEAD

*REPLACE AS REQUIRED

* Recommended maintenance by an McCulloch authorized service center technician using Genuine Factory McCulloch

Replacement parts.

✔

HOURS OF

OPERATION

✔

6-3B

12 13

7 - MAINTENANCE INSTRUCTIONS

7-1. REPLACING CUTTING LINE

1. Turn knob (A) COUNTERCLOCKWISE and remove (Figure 7-1A).

2. Remove spool (B) and spring (C) from spindle (D).

3. Remove any remaining cutting line (H).

4. Fold over evenly a 14' (4.3m) length of .095 or .080" (.24 or .20cm) cutting line. Place the looped center in one of the slots (G) of the spool divider (Figure 7-1B).

5. Wind cutting line clockwise as shown in illustration (Figure 7-1C), keeping tension, with each half separated by the spool divider. Wind to within 6" (15cm) of the ends.

6. Lock each end of line into a slot (F) on opposite sides of the spool (Figure 7-1D).

7. Install the spring (C) over the spindle (D). Insert each end of the line through an eyelet (G) in the housing (E) (Figure 7-1E).

8. Lower the spool into the housing (E) while feeding the line through the eyelets (G). Ensure the spring seats itself into the spool (Figure 7-1E).

9. Once the spool is in place, apply pressure on the spool compressing the spring. Pull each end of the line (H) sharply to unlock the line from the slots (Figure 7-1F).

10. Continue to apply pressure to the spool until the knob can be threaded CLOCKWISE onto the spindle. Tighten the knob securely by hand only (Figure 7-1G).

11. Trim the excess line to approximately 5" (13cm). This will minimize load on engine during starting and warm-up (Figure 7-1H).

7-2. AIR FILTER

CAUTION

NEVER oper must be kept clean. If it becomes damaged, install a new filter.

To Clean Air Filter:

1. Remove knob (A) holding air filter cover in place, remove cover (B) and lift filter (C) from air box (Figure

7-1D

7-2A).

2. Wash filter in soap and water. DO NOT USE GASO-

LINE!

3. Air dry filter.

4. Reinstall filter.

NOTE: Replace filter if frayed, torn, damaged or unable to be cleaned.

ate trimmer without the air filter. The air filter

7-3. FUEL CAP / FUEL FILTER

CAUTION

ve fuel from unit and store in approved container

Remo before starting this procedure. Open fuel cap slowly to release any pressure which may have formed in fuel tank. NOTE: Keep vent (A) on fuel cap clean of debris (Figure 73A).

Fuel Filter:

1. Completely remove fuel cap from fuel tank (B) to be able to remove fuel filter (C) from tank. (Figure 7-3B)

2. Pull filter (D) off with a twisting motion. (Figure 7-3C)

3. Replace fuel filter (D). (Figure 7-3C)

NOTE: Never operate the trimmer without the fuel filter. Internal engine damage could result!

7-1E

7-3A

KNOB

A. B.SPOOL C.SPRING D.SPINDLE

HOUSING

E. F. SLOTS G.EYELETS H.CUTTING LINE J. WRENCH

7-1B

7-3B

7-1A

7-1F 7-1G

7-2A

(13mm)

7-3C

7-1H

7-1C

14 15

7 - MAINTENANCE INSTRUCTIONS 8 - TROUBLESHOOTING THE ENGINE

7-4. CARBURETOR ADJUSTMENT

The carburetor was pre-set at the factory for optimum performance.The only adjustment should be to idle speed see section 5-4, Idling/Carburetor adjustment.

7-5. SPARK PLUG

1. To remove spark plug B (figure 7-6A) for cleaning or replacement: make sure engine is off, spark plug is cool then grasp spark plug boot firmly and remove from spark plug. Remove spark plug with correct spark plug tool. Inspect, clean or replace as needed.

2. Spark plug gap = .025" (.635mm) (Figure 7-5A).

3. Torque to 105 to 130 inch pounds (12 to 15 N•m). Connect spark plug boot. If necessary, replace with Champion RZ7C or equiva-

4. lent.

.025" (.635mm)

7-5A

7-6. SPARK ARRESTER SCREEN

1. To replace spark arrester screen (A) (Figure 7-6A), use a needle nose pliers, pinch an edge of the spark arrester screen. Pull the whole spark arrester screen out. Use the needle nose pliers to push in a ne

2. arrester screen.Then open the pliers a little to press the inner surf

ace of the spar

k arrester screen to fasten it.

w spar

7-6A

7-7. DEBRIS SHIELD KNIFE SHARPENING

1. Remove cutter knife (A) from debris shield (B) (Figure 7-7A).

2. Place knife in a bench vise. Sharpen knife using a flat file, being careful to maintain the angle of cutting edge. File in one direction only.

Unit won’t start or starts but will not run.

7-7A

PROBLEM PROBABLE CAUSE CORRECTIVE ACTION

Incorrect starting procedures. Follow instructions in the User Manual.

Incorrect carburetor mixture adjustment setting.

ouled spark plug

Fuel filter plugged. Replace fuel filter.

Incorrect lever position on choke. Move to RUN position.

Have carburetor adjusted by an

McCulloch Authorized Service Center.

Clean / gap or replace plug.

7-8. STORING A UNIT

Failure to follow these steps may cause varnish to form in the carburetor and difficult starting or perma-

nent damage following storage.

1. Perform all the general maintenance recommended in the Maintenance Section of your User Manual.

2. Clean exterior of engine, drive shaft assembly, debris shield and stringhead.

3. Drain fuel from the fuel tank.

4. After fuel is drained, start engine.

5. Run engine at idle until unit stops. This will purge the carburetor of fuel.

6. Allow engine to cool (approx. 5 minutes).

7. Using a spark plug wrench, remove the spark plug.

8. Pour 1 teaspoon of clean 2-cycle oil into the combustion chamber. Pull starter rope slowly several times to coat internal components. Replace spark plug.

9. Store unit in a cool, dry place away from any source of ignition such as an oil burner, water heater, etc.

Unit starts, but engine has low power.

Engine hesitates.

No power under load.

Dirty spark arrester screen. Replace spark arrester screen.

Dirty air filter. Remove, clean and reinstall filter.

Incorrect carburetor mixture adjustment setting.

Have carburetor adjusted by an

McCulloch Authorized Service Center.

Have carburetor adjusted by an

McCulloch Authorized Service Center.

7-9. REMOVING A UNIT FROM STORAGE

1. Remove spark plug. Pull star

ustion chamber

3. Clean and gap spark plug or install a new spark plug with proper gap Prepare unit f

5. Fill fuel tank with proper fuel / oil mixture. See Fuel and Lubr

ter rope briskly to clear excess oil from com-

or oper

ication Section.

ation.

Runs err

Smokes excessively.

atically.

Incorrectly gapped spar

Incorrect carburetor mixture adjustment setting.

k plug.

Clean / gap or replace plug.

Have carburetor adjusted by an

McCulloch Authorized Service Center.

Incorrect fuel mixture Use properly mixed fuel (40:1 mixture).

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