MTD 9096-334502-McCulloch-MT3025-MT30725-trimmers Parts Manuals

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USER MANUAL

Gas String Trimmers/Brushcutters

Models : MT3025/ MT30725

SAFETY OPERATION MAINTENANCE

MT3025

MT30725

WARNING • PLEASE READ

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 9096-334502 Printed in Taiwan

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INTRODUCTION 1 - GENERAL INFORMATION

PLEASE READ

Dear Customer, Thank y er operation and maintenance, it will provide you with years of service. In order to mak

TAIN 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: WARNING / CAUTION and WARRANTY. A NOTE: is used to convey additional information, to highlight a particular explanation, or to expand a step description.

A not undertaken or if improperly done, can result in serious personal injury and/or damage to the unit.

The 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 chain saw.

FOR WARRANTY OR SERVICE CONTACT THE NEAR-

EST AUTHORIZED SERVICE CENTER - LOCATE YOUR

NEAREST SERVICE CENTER BY CALLING THE TOLL

ou for purchasing a McCulloch product. With prop-

e the best use of your investment, be

CER

to familiarize yourself with the contents of the

NOTE:,

WARNING or CAUTION identifies a procedure which, if

(WARRANTY SYMBOL) serves notice that

FREE NUMBER IN THIS MANUAL.

TABLE OF CONTENTS

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

1-1. Specifications

2 GENERAL IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . .3

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

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

3-1. What To Do 3-2. What No To Do 3-3. International Symbols

4 ASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . .6

4-1. “P” Handle Assembly 4-2. “J” Handle Assembly 4-3. Debris Shield 4-4. Edge Guide Wheel 4-5. Installing the Attachment

5 FUEL AND LUBRICATION . . . . . . . . . . . . . . . . . . . . . . . . . .8

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

6 OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . .9

6-1. Starting a Cold Engine 6-2. To Stop Engine 6-3. Warm Engine Start 6-4. Idling/Carburetor Adjustment

7 TRIMMING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . .11

7-1. Additional Safety Precautions 7-2. Stringhead Line Release 7-3. Trimming Procedures

8 MAINTENANCE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . .13

8-1. Replacing Cutter Line 8-2. Replacing Cutter Line - Easy Load Head 8-3. Air Filter 8-4. Fuel Cap / Fuel Filter 8-5. Carburetor Adjustment 8-6.

Spar

k Plug

Spark Arrester Screen

8-7.

is Shield Knif

Debr

8-8.

ing a Unit

Stor

8-9. 8-10. Removing a Unit From Storage

9 TROUBLESHOOTING THE ENGINE . . . . . . . . . . . . . . . . . .18

OUBLESHOOTING THE STRINGHEAD . . . . . . . . . . . . .19

11 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

e Sharpening

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1-1. SPECIFICATIONS

Model No.

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

Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . .30cc / 1.8 ci . . . . . . . . . . . . . . . . . . . .30cc / 1.8 ci

Dry Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.22 lbs. / 5.1 kg . . . . . . . . . . . . . . .11.22 lbs. / 5.1 kg

Fuel Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . .18.6 oz. / 550 ml . . . . . . . . . . . . . . . .18.6 oz. / 550 ml

Drive Shaft Length . . . . . . . . . . . . . . . . . . . . . . .48” / 122cm . . . . . . . . . . . . . . . . . . . .26”+26” / 66cm+66cm

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

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

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

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

Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Champion DJ8J or equivalent . . . . . .Champion DJ8J or equivalent

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

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .MT3075 . . . . . . . . . . . . . . . . . . . . . . .MT30725

. . . . . . . . . . . . . . . . . . . . . . . . . . .Chrome Cylinder . . . . . . . . . . . . . . .Chrome Cylinder

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MT3025

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2 - GENERAL IDENTIFICATION

MT30725

MT3025

2-1.GENERAL IDENTIFICATION

1A. EASY LOAD HEAD 1B. BUMP FEED HEAD

2. CUTTER LINE

3. DEBRIS SHIELD DRIVE SHAFT ASSEMBL

5A. P-HANDLE 5B. J-HANDLE

TRIGGER

TTLE

THR

7. IGNITION ON/OFF SWITCH

8. SAFETY TRIGGER

9. CHOKE LEVER

ANK

FUEL

10.

11. AIR FILTER COVER

ARTER HANDLE

12.

13. MUFFLER SHIELD

14. PRIMER BULB

ARK ARREST

15.

16. EDGING GUIDE WHEEL (MT3025)

17. DEBRIS SHIELD HARDWARE

18. HARNESS (MT30725) COUPLER (MT30725)

19.

NOTE: DO NOT use blades on these models.

OR SCREEN

2-2. SAFETY FEATURES

Numbers preceding the descriptions correspond with numbers on preceding page to help you locate the safety fea-

ture

3 DEBRIS SHIELD must be installed to prevent debris

from being thrown at the operator and prevent the

ing from e

str

13 MUFFLER SHIELD helps pre

ustib

comb muffler.

15 SP

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) f

ARK ARRESTER SCREEN retains carbon and other flammab from exhaust flow.

TE:

Compliance with local, state and f

xtending longer than necessary.

vent hands, body and/or

le mater

or additional inf

ials from making contact with a hot

er 0.023" (.6 mm) in siz

le par

ticles o

ormation.

ederal laws

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3 - SAFETY PRECAUTIONS

3-1. WHAT TO DO

READ YOUR USER MANUAL AND ALL SUPPLEMENTS (IF ANY ENCLOSED) THOROUGHLY BEFORE OPERATING YOUR UNIT.

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

2 FUELING - Mix and pour fuel outdoors where there

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.

3. COMPLY WITH ALL FIRE PREVENTION REGULATIONS. 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.

4. TURN UNIT OFF before setting it down.

5. ALWAYS HOLD UNIT FIRMLY WITH BOTH HANDS, the thumb and fingers encircling the handles.

6. KEEP ALL SCREWS AND FASTENERS TIGHT. Never operate this equipment if it is improperly adjusted or not completely and securely assembled.

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

8. KEEP STRINGHEAD AS CLOSE TO GROUND AS

CTICAL. Avoid hitting small objects with string-

PRA head. When cutting on a slope, stand below stringhead.

9. CHECK AREA YOU WILL BE TRIMMING FOR DEBRIS that ma tion.

10. KEEP ALL PARTS OF YOUR BODY AND CLOTHING

WAY FROM STRINGHEAD when starting or running

A engine. Before starting engine, make sure stringhead will not come in contact with any obstacle.

11. STOP ENGINE before examining cutting line.

ORE EQUIPMENT AWAY FROM POSSIBLE IGNI-

12. TION SOURCES, such as gas-powered water heaters, clothes dryers, or oil-fired furnaces, portable heaters

13. ALWAYS KEEP the debris shield, stringhead, and engine free of debr

14. OPERATION OF EQUIPMENT should always be restricted to mature and properly instructed individuals

, etc.

y be struck or thrown during opera-

is build-up.

3-2. 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 CUTTING ATTACH-

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 m

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 injury and/or damage the unit voiding the manufacturer’s warranty.

liquids or gases whether in or out of doors. An explosion and/or fire may result. Never start or run the unit inside a closed room or building, breathing exhaust fumes can kill.

MENT. Use only McCulloch replacement parts and accessor enhance the performance and maximize the safe operation of our products. Failure to do so may cause

mance and possib

poor perf stringhead supplied with this product.

other cutting attachment. Use of such attachments will v

serious bodily injury. (Model MT3025)

oid y

our factor

uffler or spark plug wire.

, which are designed specifically to

ies

le injury. Use only the

Do not use any

y warranty

and could result in

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3-3. INTERNATIONAL SYMBOLS

3 - SAFETY PRECAUTIONS

Use of these personal safety items is highly recommended to reduce the r

isk of accidental injury.

Read the User Manual.

Minimum operating distance

Do not use blade on this unit.

Pump the primer bulb 10 times.

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4 - ASSEMBLY INSTRUCTIONS

4-1. “P” HANDLE ASSEMBLY (MT3025)

1. To install handle onto unit, you will need the following components from y screws (C) and nuts (D). (Figure 4-1A).

Install the handle (B) on the shaft 160-200mm from

2. throttle and tighten the 2 screws (C) and nuts (D).

our user kit: “P” handle (A & B),

4-1A

4-2. “J” HANDLE ASSEMBLY (MT30725)

1. To install handle onto unit, you will need the following components from your user kit: “J” handle (A), middle clamp housing (B), upper and lower clamps (C) and screws (D). (Fig. 4-2A)

2. Install the middle clamp housing (B) on the shaft near the arrows on the sticker (warning label E ), put the lowerclamp (C) under shaft and tighten with 2 screws (D).

3. Install the J handle (A) on the middle clamp housing, then put the upper clamp (C) over J-handle and tighten the other 2 screws (D).

4-3. DEBRIS SHIELD

WARNING

The debris shield must be installed (Figure 4-3A) 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. 4-3A)

2. Insert bolt (C), washer (D), lock washer (E) and wing nut (F), tighten securely. (Fig. 4-3B)

4-3A

4-2A

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4-3B

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4 - ASSEMBLY INSTRUCTIONS 5 - FUEL AND LUBRICATION

4-4. EDGE GUIDE WHEEL (FIG. 4-4A) MT30725

Push edging guide wheel (A) onto shaft. Some force

1. may be required.

2. Insert bolt (B), washer (C) and wing nut (D), tighten securely.

3. Adjust the edging depth by loosening wing nut (E) and moving the guide wheel (A) the desired position along the shown arrow and tighten securely.

4-4A

4-5. INSTALLING THE ATTACHMENT

(MT30725)

Coupler

Primary Hole

Upper Shaft Housing

Knob

4-5A

Release Button

Attachment

4-5B

WARNING

To avoid serious personal injury, shut unit off before removing or installing attachment. NOTE: To make installing or removing the attachment easier, place the unit on the ground or on a work bench.

1. Turn the knob counterclockwise to loosen (Fig. 4-5A).

2. While firmly holding the attachment, push it straight into

the coupler until the release button appears in the primary hole of the coupler. (Fig. 4-5B)

3. Turn the knob clockwise to tighten. (Fig. 4-5C)

CAUTION

The release button must be in the primary hole and the knob securely tightened before operating this unit.

All attachments are designed to be used in the primary hole unless otherwise indicated in the specific attachments operators manual. If the incorrect hole is used, it could result in injury, or damage to the unit.

NOTE: Turn attachment rotating parts by hand to and fro to have the attachment shaft connect to the powerhead drive shaft slot more easily.

Knob

4-5C

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5-1. FUEL

Use regular grade unleaded gasoline mixed with Genuine Factory Parts 40:1 custom 2-cycle engine oil for best results. Use mixing ratios in Section 5-3.

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 Factory Parts

Custom 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 r the cause of engine damage engine warranty.

atio of 100:1. If insufficient lubrication is

, it voids the manufacturer’s

5-2. 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.

5-4. RECOMMENDED FUELS

Some conventional gasolines are being blended with oxygenates such as alcohol or an ether compound to meet clean air standards

ate satisfactorily on any gasoline intended for automo-

oper tive use including oxygenated gasolines.

. Your McCulloch engine is designed to

5-5. FUEL AND LUBRICATION SYMBOLS

Gasoline and Oil Mix 40:1

5-3. FUEL MIXING TABLE

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6 - OPERATING INSTRUCTIONS

6-1. STARTING A COLD ENGINE (Put unit on the ground before starting see fig. 6-1E)

TE:To minimize load on engine during starting and

warm-up, trim excess cutter line to 5" (13cm) (Figure 6-1A).

Move on/off ignition switch to the “RUN (I) ” position.

(Figure 6-1B)

2. Prime the carburetor. Pump the primer bulb (A) 10

times (Figure 6-1C).

3. Your unit is designed with a 3 position choke: FULL

CHOKE “ ”, PARTIAL CHOKE “ ”, and RUN “ ”. Move choke lever to FULL CHOKE “ ” position (Figure 6-1D). Grasp throttle handle firmly while depressing safety trigger and squeeze throttle trigger to FULL position and pull starter rope briskly 6 times. (Fig. 6-1E)

NOTE: Smooth Pull starting requires much less effort than units without Smooth Pull. Pull with a smooth steady pull. Pull starter rope out a short way until resistance is felt (approximately 4") (Figure 6-1E). A smooth rapid pull is required for a strong spark.

4. Move choke lever to PARTIAL CHOKE “ ” position

then pull starter rope 6 times. (Figure 6-1F)

5. Warm up 10 sec in idle then move choke lever to RUN

“ ” position. (Figure 6-1G) NOTE: Don’t release trigger while pulling starter rope in steps 3 to 5.

6. If engine fails to start, repeat steps 1 through 5. NOTE: If engine fails to start after repeated attempts, refer to Troubleshooting 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.

6-1C

6-1D

6-1E

5" (13cm)

6-1F

6-1A

6-1B

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6-1G

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6 - OPERATING INSTRUCTIONS

6-2. TO STOP ENGINE

1. Release throttle trigger. Let engine return to idle. Move

ignition switch (A) to the “ STOP ” position for stopping engine. (Figure 6-2A).

6-2A

6-3. WARM ENGINE START

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

2. Place choke in RUN “ ” position (Figure 6-3A).

3. Pull starter rope briskly until engine starts, but no

more than 3 times.

4. Grasp throttle handle firmly while depressing safety

trigger and squeeze throttle trigger to FULL position. Keep throttle at FULL position until engine runs smoothly.

5. If engine fails to start, use “starting a cold engine” pro-

cedure.

6-4. IDLING/CARBURETOR ADJUSTMENT

1. Occassionally, due to atmospheric conditions such as altitude it might be necessary to make slight adjustment to idle speed. Insert phillips or flat screwdriver into access hole A (fig-

2. ure 6-4A). Turn 1/8 turn clockwise to increase idle speed and 1/8 turn counterclockwise to decrease idle speed.

6-4A

6-3A

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7 - TRIMMING INSTRUCTIONS

7-1. ADDITIONAL SAFETY PRECAUTIONS

Before operating your unit, review ALL SAFETY PRECAUTIONS 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.

7-2. STRINGHEAD LINE RELEASE

WARNING / CAUTION

DO NOT use steel wire or plastic-coated steel wire of any kind with your stringhead. Serious operator injury can result. To release fresh line, run engine at full throttle and “bump” stringhead against lawn. Line will automatically release. The knife in debris shield will trim excess line (Figure 7-2A).

UMP

7-2A

7-2B

7-3. TRIMMING PROCEDURES

When properly equipped with a debris shield and stringhead, your unit will trim unsightly weeds and tall grass in those hard-to-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: Even with care, trimming around foundations, brick or stone walls, curves, etc., will result in above normal string wear.

TRIMMING / MOWING

Swing trimmer with a sickle-like motion 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 7-3A).

CAUTION

Be sure engine is off and str attempting to remove weed wrap. Periodically remove weed wrap to prevent overheating the drive shaft. Weed wrap occurs when strands of weeds become entangled around the shaft beneath the debris shield (Figure 7-2B). This condition prevents the shaft from being properly cooled.

ap with scre

Remo

e w

eed wr

ing head has stopped bef

wdriver or similar device.

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ore

7-3A

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7 - TRIMMING INSTRUCTIONS

CLOSER TRIMMING

Position trimmer straight ahead with a slight tilt so bottom of stringhead is above ground level and string contact occurs at proper cutting point. ator. Do not pull trimmer in toward operator.

Always cut away from oper-

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 73B).

WARNING

DO NOT SWEEP WITH TRIMMER

eeping refers to tilting stringhead to sweep away debris

Sw 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.

7-3B

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8 - MAINTENANCE INSTRUCTIONS

MAINTENANCE CHECKLIST

ITEM

SCREWS / NUTS / BOLTS

AIR FILTER

FUEL FILTER

SPARK PLUG

SPARK ARRESTER SCREEN

FUEL HOSES

BLADE

ACTION

INSPECT / TIGHTEN

CLEAN OR REPLACE

REPLACE

CLEAN / ADJUST / REPLACE

CLEAN OR REPLA

INSPECT

*REPLACE AS REQUIRED

INSPECT

*REPLACE AS REQUIRED

EACH USE

✔

OPERATION

✔

HOURS OF

✔

*Recommended for maintenence by an authorized service center technician using Genuine Factory replacement parts

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8 - MAINTENANCE INSTRUCTIONS

8-1. REPLACING CUTTER LINE (MT3025)

1. Turn knob (A) COUNTERCLOCKWISE and remove (Figure 8-1A).

2. Remove spool (B) and spring (C) from spindle (D). Remove any remaining cutter line (H).

4. Fold over evenly a 14' (4.3m) length of .095 or .080" (.24 or .20cm) cutter line. Place the looped center in one of the slots (G) of the spool divider (Figure 8-1B).

5. Wind cutter line clockwise as shown in illustration (Figure 8-1C), 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 8-1D).

7. Install the spring (C) over the spindle (D). Insert each

end of the line through an eyelet (G) in the housing (E) (Figure 8-1E).

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 8-1E).

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 8-1F).

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 8-1G).

11. Trim the excess line to approximately 5" (13cm). This

will minimize load on engine during starting and warmup (Figure 8-1H).

8-1D

8-1E

KNOB

A. B.SPOOL

SPRING

C. D.SPINDLE E. HOUSING

SLOTS

F G.EYELETS H.CUTTER LINE

WRENCH

8-1B

8-1A

8-1C

8-1F 8-1G

(13mm)

8-1H

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8 - MAINTENANCE INSTRUCTIONS

8-2. REPLACING CUTTER LINE-EASY-LOAD

HEAD (MT30725)

1. Use a small screwdriver or pointed rod to release line

from locking tabs. (Fig. 8-2A) Remove remaining line from head.

3. Align arrows on inner and outer spool.(Fig. 8-2B)

4. Cut a length of trimming line approximately 16 feet (5

meters) long.

5. While pushing inner spool down insert each end of line

through eyelets into feed slot on spool divider. Insure line enters feed slots. Push line until approximately 2 inches (5 cm) appears from below bump knob.(Fig. 82C)

6. Insert each end into locking tabs by pushing the line

end through lower tab hole and looping end back through upper tab hole. Pull line at eyelet to tension. (Fig. 8-2D)

7. Once both line ends are locked in place turn inner spool

counter clockwise in direction of arrows to load line. (Fig. 8-2E).

8. Wind spool until a loop of line approximately 10 inches

(25cm) long is visible. Cut loop in half to create two cutting line ends. Ensure each line end is not more than 5 inches (13cm) long. This will minimize load on engine during starting. (Fig. 8-2F)

8-2C

8-2A

8-2D

8-2E

8-2B

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8-2F

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8 - MAINTENANCE INSTRUCTIONS

8-3. AIR FILTER

CAUTION

NEVER operate trimmer without the air filter. The air filter 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 8-3A).

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.

8-4. FUEL CAP / FUEL FILTER

CAUTION

Remove fuel from unit and store in approved container 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 84A).

Fuel Filter:

1. Completely remove fuel cap from fuel tank (B) to be able to remove fuel filter (C) from tank. (Figure 8-4B)

2. Pull filter (D) off with a twisting motion. (Figure 8-4C)

3. Replace fuel filter (D). (Figure 8-4C)

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

8-3A

8-4A

8-4B

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8-4C

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8 - MAINTENANCE INSTRUCTIONS

8-5. CARBURETOR ADJUSTMENT

The carburetor was pre-set at the factory for optimum performance. The only adjustment should be to idle speedseesection 6-4, Idling/Carburetor adjustment.

8-6. SPARK PLUG

1. To remove spark plug B (figure 8-7A) 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 8-6A).

3. Torque to 105 to 130 inch pounds (12 to 15 N•m). Connect spark plug boot.

4. If necessary, replace with Champion RZ7C or equivalent.

.025" (.635mm)

8-6A

8-7. SPARK ARRESTER SCREEN

1. To replace spark arrester screen (A) (Figure 8-7A), use a needle nose pliers, pinch an edge of the spark arrester screen. Pull the whole spark arrester screen out.

2. Use the needle nose pliers to push in a new spark arrester screen.Then open the pliers a little to press the inner surface of the spark arrester screen to fasten it.

8-8. DEBRIS SHIELD KNIFE SHARPENING

1. Remove cutter knife (A) from debris shield (B) (Figure 8-8A).

2. Place knife in a bench vise. Sharpen knife using a flat

, being careful to maintain the angle of cutting edge.

file File in one direction only.

8-8A

8-9. 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

Replace spark plug.

times to coat inter

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

nal components

8-7A

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8-10. REMOVING A UNIT FROM STORAGE

Remove spark plug.

2. Pull starter rope briskly to clear excess oil from combustion chamber. Clean and gap spark plug or install a new spark plug

3. with proper gap.

4. Prepare unit for operation. Fill fuel tank with proper fuel / oil mixture. See Fuel and

5. Lubrication Section.

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9 - TROUBLESHOOTING THE ENGINE

PROBLEM

on’t start or starts but will not

Unit w

un.

Unit starts, but engine has low power.

PROBABLE CAUSE

Incorrect star

Incorrect carburetor mixture adjustment setting.

Fouled spark plug

Fuel filter plugged.

Incorrect lever position on choke.

Dirty spark arrester screen.

Dirty air filter.

Incorrect carburetor mixture adjustment setting.

ting procedures.

CORRECTIVE ACTION

ollow instructions in the User Manual.

Have carburetor adjusted by an Authorized Service Center.

Clean / gap or replace plug.

Replace fuel filter.

Move to RUN position.

Replace spark arrester screen.

Remove, clean and reinstall filter.

Have carburetor adjusted by an Authorized Service Center.

Engine hesitates.

No power under load.

Runs erratically.

xcessively.

es e

Smok

Incorrect carburetor mixture adjustment setting.

Incorrectly gapped spark plug.

Incorrect carburetor mixture adjustment setting.

Incorrect fuel mixture.

Have carburetor adjusted by an Authorized Service Center.

Clean / gap or replace plug.

Have carburetor adjusted by an Authorized Service Center.

Use properly mixed fuel (40:1 mixture).

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10- TROUBLESHOOTING THE STRINGHEAD

PROBLEME

Line won’t feed.

Line snaps off or frays.

Unable to remove stringhead knob.

Stringhead and shaft are hot to the touch.

CCAUSE PROBABLE

Line is tangled inside stringhead.

Upon removing spool, line appears to be melted together. Line wound in wrong direction inside stringhead.

Insufficient line inside stringhead.

Internal damage to stringhead caused by bumping too hard on ground while advancing line. Improper trimming procedures, or poor quality line. Stringhead knob overtightened.

Weed wrap.

SOLUTION

Remove spool from unit; disassemble. Untangle line and wind correctly in direction indicated on spool (see Section 8-1). Trim off damaged line and rewind line (see Section 8-1). Remove spool. Check to be certain line is wound in direction indicated on line element (see Section 8-1). Remove spool and install new line (see Section 8-1). Disassemble stringhead and examine parts for damage. Replace parts or entire head (see Section 8-1). See Trimming Procedures (see section 7-3) or replace line (see section 8-1) Use anti-seize compound and reinstall knob HAND TIGHT ONLY. Remove weed wrap (see Section 7-2).

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+ 44 hidden pages

MTD 9096-334502-McCulloch-MT3025-MT30725-trimmers Parts Manuals

Specifications and Main Features

Frequently Asked Questions

User Manual