Dolmar PE-251, EDGING TRIMMER PE-251 User Manual [en, es, fr]

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Edging Trimmer








Read this instruction manual thoroughly before using the Edging Trimmer and follow the safety regulations carefully. Be sure to keep this instruction manual for future reference.


Lire soigneusement ce manuel d’instructions avant d’utiliser la dresse-bordure et observer strictement les consignes de sécurité ! Conserver ce manuel dans un endroit sûr pour toute référence future.


Lea este manual de instrucciones con atención antes de utilizar la desbrozadora y cumpla estrictamente la normativa de seguridad. Guarde este manual de instrucciones en un lugar seguro para futuras consultas.


Thank you very much for choosing the DOLMAR Edging trimmer. We are pleased to offer you a product that is the result of an extensive development program and many years of knowledge and experience.

To safety obtain the possible possible result from your DOLMAR Edging trimmer, please read this manual thoroughly before using the machine, and follow all instructions given herein to assure proper operation of the DOLMAR Edging Trimmer.

Table of Contents


Symbols ......................................................................


Safety instructions .....................................................


Technical data ............................................................


Designation of parts ...................................................


Assembly of engine and shaft ...................................


Mounting of handle ...................................................


Mounting of wheel ....................................................


Mounting of deflector ...............................................


Fuels / Refuelling ......................................................


Correct handling of machine .....................................


Points in operation and how to stop .........................


Servicing instructions ...............................................


Storage .....................................................................



Please note the following symbols when reading the instructions manual.


Before usage, carefully read and fully understand the instructions in this manual


No smoking

No naked flame

Wear protective shoes

Wear protective gloves

Keep working area clear of persons and pets

Wear a protective helmet and eye and ear protection

Cutting of foot

Top permissible tool speed

Flying object hazard

Gasoline/oil mixture

Engine manual-start

Emergency stop

First aid






General Instructions

To ensure correct operation, user has to read this instruction manual to make himself familiar with the handling of the Edging trimmer. Users insufficiently informed will risk danger to themselves as well as others due to improper handling.

It is recommended only to lend the Edging trimmer to people who have proven to be experienced with Edging trimmers.

Always hand over the instruction manual.

First users should ask the dealer for basic instructions to familiarize oneself with the handling of an engine powered cutter.

Children and young persons aged under 18 years must not be allowed to operate the Edging trimmer. Persons over the age of 16 years may however use the device for the purpose of being trained only whilst under supervision of a qualified trainer.

Use Edging trimmers with the utmost care and attention.

Operate the Edging trimmer only if you are in good physical condition. Perform all work calmly and carefully. The user has to accept liability for others.

Never use the Edging trimmer after consumption of alcohol or drugs, or if feeling tired or ill.

Intended use of the machine

– Use the unit only for edging the grass, lawn or weeds.

Personal protective equipment

The clothing worn should be functional and appropriate, i.e. it should be tight-fitting but not cause hindrance. Do not wear either jewelry or clothing which could become entangled with bushes or shrubs.

In order to avoid either head-, eye-, hand-or foot injuries as well as to protect your hearing the following protective equipment and protective clothing must be used during operation of the Edging trimmer.

Always wear a helmet where there is a risk of falling objects. The protective helmet (1) is to be checked at regular intervals for damage and is to be replaced at the latest after 5 years. Use only approved protective helmets.

The visor (2) of the helmet (or alternatively goggles) protects the face from flying debris and stones. During operation of the Edging trimmer always wear goggles, or a visor to prevent eye injuries.

Wear adequate noise protection equipment to avoid hearing impairment (ear muffs (3), ear plugs etc.).

The work overalls (4) protect against flying stones and debris. We strongly recommend that the user wears work overalls.

Special gloves (5) made of thick leather are part of the prescribed equipment and must always be worn during operation of the Edging trimmer.

When using the Edging trimmer, always wear sturdy shoes (6) with a nonslip sole. This protects against injuries and ensures a good footing.

Starting up the Edging Trimmer

Please make sure that there are no children or other people within a working range of 15 meters (50ft), also pay attention to any animals in the working vicinity.

Before use always check that the Edging trimmer is safe for operation: Check the security of the cutting tool, the control lever for easy action and check for proper functioning of the control lever lock.

Rotation of the cutting tool during idling speed is not allowed. Check with your dealer for adjustment if in doubt. Check for clean and dry handles and test the function of the start/stop switch.


Start the Edging trimmer only in accordance with the instructions. Do not use any other methods for starting the engine!

Use the Edging trimmer and the tools only for such applications as specified.

Only start the Edging trimmer engine, after the entire assembly is done. Operation of the device is only permitted after all the appropriate accessories are attached!

Before starting make sure that the cutting tool has no contact with hard objects such as branches, stones etc. as the cutting tool will revolve when starting.

The engine is to be switched off immediately in case of any engine problems.

Should the cutting tool hit stones or other hard objects, immediately switch off the engine and inspect the cutting tool.

Inspect the cutting tool at short regular intervals for damage (detection of hairline cracks by means of tapping-noise test).

Operate the Edging trimmer only with the shoulder strap attached which is to be suitably adjusted before putting the Edging trimmer into operation. It is essential to adjust the shoulder strap according to the user’s size to prevent fatigue occurring during use. Never hold the cutter with one hand during use.

During operation always hold the Edging trimmer with both hands. Always ensure a safe footing.

Operate the Edging trimmer in such a manner as to avoid inhalation of the exhaust gases. Never run the engine in enclosed rooms (risk of gas poisoning). Carbon monoxide is an odorless gas.

Switch off the engine when resting and when leaving the Edging trimmer unattended, and place it in a safe location to prevent danger to others or damage to the machine.

Never put the hot Edging trimmer onto dry grass or onto any combustible materials.

The cutting tool has to be equipped with it’s appropriate Blade Cover. Never run the cutter without this Blade Cover!

All protective installations and guards supplied with the machine must be used during operation.

Never operate the engine with faulty exhaust muffler.

Shut off the engine during transport.

During transport over long distances the tool protection included with the equipment must always be used.

Ensure safe position of the Edging trimmer during car transportation to avoid fuel leakage.

When transporting the Edging trimmer, ensure that the fuel tank is completely empty.

When unloading the Edging trimmer from the truck, never drop the Engine to the ground or this may severely damage the fuel tank.

Except in case of emergency, never drop or cast the Edging trimmer to the ground or this may severely damage the Edging trimmer.

Remember to lift the entire equipment from the ground when moving the equipment. Dragging the fuel tank is highly dangerous and will cause damage and leakage of fuel, possibly causing fire.


Shut off the engine during refuelling, keep away from open flames and do not smoke.

Avoid skin contact with mineral oil products. Do not inhale fuel vapor. Always wear protective gloves during refuelling. Change and clean protective clothing at regular intervals.

Take care not to spill either fuel or oil in order to prevent soil contamination (environmental protection). Clean the Edging trimmer immediately after fuel has been spilt.

Avoid any fuel contact with your clothing. Change your clothing instantly if fuel has been spilt on it (to prevent clothing catching fire).

Inspect the fuel cap at regular intervals making sure that it can be securely fastened and does not leak.

Carefully tighten the fuel tank cap. Change location to start the engine (at least 3 meters away from the place of refuelling).

Never refuel in closed rooms. Fuel vapors accumulate at ground lever (risk of explosions).

Only transport and store fuel in approved containers. Make sure the fuel stored is not accessible to children.





Tool Replacement
































































































































































































































































































Method of operation

Only use the Edging trimmer in good light and visibility. During the winter season beware of slippery or wet areas, ice and snow (risk of slipping). Always ensure a safe footing.

Never work on unstable surfaces.

Remove sand, stones, nails etc. found within the working range. Foreign particles may damage the cutting tool and can cause dangerous kick-backs.

Before commencing cutting, the cutting tool must have reached full working speed.

Cutting Blade

Employ only the correct cutting blade for the job in hand.

Inspect the entire unit for loosing, missing and damage of the parts (especially the cutter blade). Never use cracked, deformed or damaged cutting blade.

Maintenance instructions

The condition of the cutter of the protective devices and also of the shoulder strap must be checked before commencing work. Particular attention is to be paid to the cutting blade which must be correctly sharpened.

Turn off the engine and remove spark plug connector when replacing or sharpening cutting blade, and also when cleaning the cutting blade.

Never straighten or weld damaged cutting tools.

Operate the Edging trimmer with as little noise and contamination as possible. In particular check the correct setting of the carburetor.

Clean the Edging trimmer at regular intervals and check that all screws and nuts are well tightened.

Never service or store the Edging trimmer in the vicinity of naked flames.

Always store the Edging trimmer in locked rooms and with an emptied fuel tank.

Observe the relevant accident prevention instructions issued by the relevant trade associations and by the insurance companies.

Do not perform any modifications on the Edging trimmer as this will endanger your safety.

The performance of maintenance or repair work by the user is limited to those activities as described in the instruction manual. All other work is to be done by an Authorized Service Agent. Use only genuine spare parts and accessories released and supplied by DOLMAR.

Use of non-approved accessories and tools means increased risk of accidents.

DOLMAR will not accept any liability for accidents or damage caused by the use of non-approved cutting blade and fixing devices of cutting blade, or accessories.

First Aid

In case of accident make sure that a first-aid box is available in the vicinity of the cutting operations. Immediately replace any item taken from the first aid box.

When asking for help, please give the following information:

Place of accident

What happened

Number of injured persons

Kind of injuries

Your name


The DOLMAR Edging trimmer will be delivered in two protective cardboard boxes to prevent transport damage. Cardboard is a basic raw material and is therefore consequently reusable or suitable for recycling (waste paper recycling).










Loop handle






Dimensions : length x width x height (without cutting blade)






Mass (without cutting blade)






Volume (fuel tank)






Engine displacement






Maximum engine performance


1.0 at 7000 /min




Engine speed at recommended max. spindle speed






Maximum spindle speed (corresponding)






Maximum fuel consumption







Maximum specific fuel consumption







Idling speed






Clutch engagement speed












Ignition system


Solid state ignition




Spark plug






Electrode gap


0.6 - 0.7






Mixed gas(gasoline: DOLMAR Genuine Two-stroke Engine Oil =50:1)




Gear ratio
















Fuel Tank






Rewind Starter




Air Cleaner




I-O Switch (on/off)




Spark Plug




Exhaust Muffler


Clutch Case






Rear Grip













Control Lever




Control Cable











Blade Cover







Gear Case











Exhaust Pipe






Fuel Filler Cap




Starter Knob




Primmer Pump




Choke Lever







CAUTION: Before doing any work on the brush cutter, always switch off the motor and pull the spark plug connector off the spark plug. Always wear protective gloves.

CAUTION: Start the brush cutter only after having assembled it completely.


– Loosen the two bolts (1) and insert the main pipe (2) into the case clutch (3).


– Always insert the drive shaft into the clutch fully (approx.65mm).


If it is difficult to insert, turn the spline (4) a little and re-insert.


–Tighten the two bolts (1) uniformly on the right and left by Allen wrench supplied.

How to mount the control cable

Remove the air cleaner cover.

Put the control cable (5) into the adjusting cable (6). Shift the swivel (7) and put the cable into the swivel. At this time, be careful that the round hole in the swivel is oriented toward the fitting at the inner wire end.

Release the swivel and make sure that the inner wire fitting is placed in the hole.

Mount the air cleaner cover.

Connection of the switch cord

Connect the switch cords to the two cords from the engine by inserting one into the other.

– Fix the cord connector by clamp.



CAUTION: Before doing any work on the Edging trimmer, always stop the engine and pull the spark plug connector off the spark plug. Always wear protective gloves!

Fix a barrier to the left side of the machine together with the handle for operator’s protection.

Do not adjust position of the loop handle too close to the control grip.

Keep not less than 250mm distance between the handle and the grip. (a distance collar is provided for this purpose.)


Mount the wheel as shown in the fugure. Tighten the bolt M8 to secure the wheel.


Attach the debris deflector onto the hook on the blade cover. Tighten the screw M5 to secure the debris deflector.



Handling fuel

Utmost care is required when handling fuel. Fuel may contain substances similar to solvents. Refuel either in a well ventilated room or outdoors. Do not inhale fuel vapors, avoid any contact of fuel or oil with your skin.

Mineral oil products degrease your skin. If your skin comes in contact with these substances repeatedly and for an extended period of time, it will desiccate. Various skin diseases may result. In addition, allergic reactions may occur. Eyes can be irritated by contact with oil. If oil comes into your eyes, immediately wash them with clear water. If your eyes are still irritated, see a doctor immediately.

Fuel and oil mixture

The engine of the Edging trimmer is a high-efficiency two-stroke engine. It is run with a mixture of fuel and two-stroke engine oil. The engine is designed for unleaded regular fuel with a min. octane value of 91 RON. In case no such fuel is available, you can use fuel with a higher octane value. This will not affect the engine, but may cause poor operating behaviour.

A similar situation will arise from the use of leaded fuel. To obtain optimum engine operation and to protect your health and the environment, only unleaded fuel should be used!

For lubricating the engine use a two-stroke engine oil (quality grade: TC-3), which is added to the fuel. The engine has been designed to use specified two-stroke engine oil at mixture ratio of 50:1 to protect the environment. In addition, a long service life and a reliable operation with a minimum emission of exhaust gases is guaranteed. It is absolutely essential to observe a mixture ratio of 50:1 (specified 2-stroke engine oil), as otherwise reliable function of the Edging trimmer cannot be guaranteed.

The correct mixture ratio:

Gasoline : Specified two-stroke engine oil = 50 : 1 or Gasoline : Other manufacturer’s two-stroke engine oil = 25 : 1


Note: For preparing the fuel-oil mixture first mix the entire oil quantity with half of the fuel required, then add the remaining fuel. Thoroughly shake the mixture before filling it into the Edging trimmer tank. It is not wise to add more engine oil than specified to ensure safe operation.

This will only result in a higher production of combustion residues which will pollute the environment and clog the exhaust channel in the cylinder as well as the muffler. In addition, the fuel consumption will rise and the performance will decrease.


The engine must be switched off.

Thoroughly clean the area around the fuel filler cap (2), to prevent dirt from getting into the fuel tank (1).

Unscrew the fuel filler cap (2) and fill the tank with fuel.

Tightly screw on the fuel filler cap (2).

Clean screw fuel filler cap (2) and tank after refueling.

Storage of Fuel

Fuel cannot be stored for an unlimited period of time.

Purchase only the quantity required for a 4 week operating period. Only use approved fuel storage containers.

Observe the Safety Instructions on page 4.


















mL (1 L)







mL (5 L)







mL (10 L)
























Attachment of shoulder strap

– Adjust the strap length so that the wheel will be kept on the ground.


In an emergency, push the notches (1) at both sides, and you can detach the machine from you.

Be extremely careful to maintain control of the machine at this time. Do not allow the machine to be deflected toward you or anyone in the work vicinity.

WARNING: Failure to maintain complete control of the machine at all could result in serious bodily injury or DEATH.

Before edging, water the area to soften the ground and make edging easier.

Before edging, check the area and remove all obstacles and objects that could be thrown..

Plan to edge regularly to make it easier to keep a neat edge and to avoid having to make more than one pass.


Blade depth may have to be adjusted due to differences in height between the hard surface and the top of the grass.

Adjust the blades’ depth of cut to produce a fine cut between sidewalk and grass using a minimum blade depth, usually with about 1/2” of the blade into the ground.


The blades’ depth of cut is adjusted by moving the blade guard.

Adjust blades’ depth of cut by loosening the grip bolt, moving the guard toward the operator to reduce depth or away from the operator to increase depth, and then retightening the bolt.

When starting to edge, run the engine at full throttle, and lower the blade gently into the ground, being careful not to hit the concrete with the blade.

Do not force the blade rotate more than the normal rotation.


Observe the applicable accident prevention regulations.




Move at least 3m away from the place of refuelling. Place the edging trimmer on a clean piece of ground taking care that the cutting blade does not come into contact with the ground or any other objects.

Cold start

– Push the I-O switch (1) in the direction shown by the arrow.


First place the machine on the ground.

Give a gentle push on the primer pump (2) repeatedly (7-10 times) until fuel comes into the primer pump.

– Push the choke lever (3) to the position “





Firmly hold the clutch case by your left hand, as illustrated.

Slowly pull the starter grip until resistance is felt and continue with a smart pull.

Do not pull out the starter rope to its full extent and do not allow the starter handle to be retracted without control, but ensure that it is retracted slowly.

Repeat the starting operation until initial ignitions are heard.

When the engine start, return the choke lever to “”. Please note that the choke lever will return to “ ”position automatically when the throttle lever is operated and the throttle is opened.

Run the engine for approximately one minute at a moderate speed before applying full throttle.

Note: – If the starter handle is pulled repeatedly when the choke lever remains at “ ” position, the engine will not start easily due to excessive fuel intake.

In case of excessive fuel intake, remove the spark plug and pull the starter handle slowly to remove excess fuel. Also,dry the electrode section of the spark plug.

Caution during operation:

If the throttle lever is opened fully in a no-load operation, the engine rotation is increased to 10,000 /min or more. Never operate the engine at a higher speed than required and at an approximate speed of 6,000 - 8,000 /min.

Starting the warm engine

– Same as adove, except without moving the choke lever (choke lever remains in the position “ ” ).


Release the throttle lever (6) fully, and when the engine rpm has lowered, push the I-O switch (1) to “O” position the engine will now stop.

Be aware that the cutting head may not stop immediately and allow it to slow down fully.


The cutter blade or the nylon cutting head should not run when the control lever is fully released. If necessary, adjust the idle rpm using the idle adjusting screw.

Checking the Idling speed

Idle speed should be set to 2,600 /min.

If necessary correct it by means of the idle screw (the cutting blade must not turn when the engine is on idle).

Screwing in the screw (1) will cause an increase in the engine speed, whereas backing off the screw will reduce the engine speed.




CAUTION : Before doing any work on the Edging trimmer, always switch off the motor and pull the plug cap off the spark plug (see “checking the spark plug”).

Always wear protective gloves.

CAUTION : Never remove the recoil starter for yourself, which may cause an accident.It should be asked to the Authorized Service Agent.

To ensure a long service life and to avoid any damage to the equipment, the following servicing operations should be performed at regular intervals.

Daily checkup and maintenance

Before operation, check the machine for loose screws or missing parts. Pay particular attention to the tightness of the blade.

Before operation, always check for clogging of the cooling air passage and the cylinder fins. Clean them if necessary.

Perform the following work daily after use:

Clean the Edging trimmer externally and inspect for damage.

Clean the air filter. When working under extremely dusty conditions, clean the filter the severall times a day.

Check the blade for damage and make sure it is firmly mounted.

Check that there is sufficient difference between idling and engagement speed to ensure that the cutting blade is at a standstill while the engine is idling (if necessary, reduce idling speed).

If under idling conditions the tool should still continue to run, consult your nearest Authorized Service Agent.

Check the functioning of the I-O switch, the lock-off lever, the control lever, and the look button.

Cleaning of air cleaner

Unscrew screw (1).

Remove the air cleaner cover (3).

Take out the sponge element (2), wash it in lukewarm water and dry it completely.

After cleaning, put back the air cleaner cover (3) and fasten it with screw (1).

NOTE: If there is excessive dust or dirt adhering to the air cleaner, clean it every day. A clogged air cleaner may make it difficult or impossible to start the engine or increase the engine rotational speed.


Checking the spark plug

– Only use the supplied universal wrench to remove or to install the spark plug.

– The gap between the two electrodes of the spark plug should be 0.6-0.7mm (0.024”-0.028”). If the gap is too wide or too narrow, adjust it. If the spark plug is clogged with carton or fouled, clean it thoroubhly or replace it.

CAUTION : Never touch the spark plug connector while the engine is running

(danger of high voltage electric shock).

0.6mm-0.7mm (0.024”-0.028”)

Supply of grease to gear case

– Supply grease (Shell Alvania 3 or equivalent) to the gear case through the grease hole every 30 hours. (Genuine DOLMAR grease may be purchased from your DOLMAR dealer.)

Supply of grease to flexible shaft

– Pull the flexible shaft out of the drive shaft and apply grease (Shell alvania

Grease hole

No.2 or equivarent) to the flexible shaft every 10 hours.


Suction head in the fuel tank

The fuel filler (5) of the suction head is used to filler the fuel required by the carburetor.

A periodical visual inspection of the fuel filter is to be conducted. For that purpose open the tank cap, use a wire hook and pull out the suction head through the tank opening. Filters found to have hardened, been polluted or clogged up are to be replaced.

Insufficient fuel supply can result in the admissible maximum speed being exceeded. It is therefore important to replace the fuel filter at least quarterly to ensure satisfactory fuel supply to the carburetor.

Cleaning of muffler exhaust port

Check of muffler exhaust port (6) regularly.

If it is clogged by carbon deposits, carefully scratch the deposits out with a suitable tool.

Any maintenance of adjustment work that is not included and described in this manual is only to be performed by Authorized Service Agents.



When the machine is in storage for a long time, drain fuel from the fuel tank and carburetor, as follows: Drain all fuel from the fuel tank. Dispose of properly and in accordance with all local laws.

Remove the spark plug and a few drops of oil into the spark plug hole. Then, pull the starter gently, so that oil covers the engine inside and tighten

the spark plug.

Drain fuel




Clear dirt or dust from the cutter blade and outside of engine, wipe them with a oil-immersed cloth and keep the machine in a place as dry as possible.

Maintenance schedule


Engine assembly, screws and

Visual inspection for damage and tightness



Check for general condition and security




After each refuelling

Control lever

Functional check


I-O switch

Functional check





Air filter

To be cleaned


Cooling air duct

To be cleaned


Cutting blade

Check for damage and sharpness


Idling speed

Inspection (cutting blade must not move)





Spark plug

Inspection, replace if necessary



Check and if necessary clean the opening





Suction head

To be replaced


Fuel tank

To be cleaned




Shuting down procedure

Fuel tank

Empty fuel tank



Operate until engine runs out of fuel




Fault location









Engine not starting or with

Ignition system

Ignition spark O.K.

Fault in fuel supply or compression system, mechanical







No ignition spark

I-O switch operated, wiring fault or short circuit, spark




plug or connector defective, ignition module faulty


Fuel supply

Fuel tank filled

Incorrect choke position, carburetor defective, fuel supply




line bent or blocked, fuel dirty.



No compression when

Cylinder bottom gasket defective, crankshaft seals



pulled over

damaged, cylinder or piston rings defective or improper




sealing of spark plug


Mechanical fault

Starter not engaging

Broken starter spring, broken parts inside of the engine

Warm start problems


Tank filled ignition spark

Carburetor contaminated, must be cleaned





Engine starts but dies

Fuel supply

Tank filled

Incorrect idling adjustment, carburetor contaminated




Fuel tank vent defective, fuel supply line interrupted,




cable or I-O switch faulty

Insufficient performance

Several systems

Engine idling poor

Air filter contaminated, carburetor contaminated, muffler


may simultaneously


clogged, exhaust duct in the cylinder clogged


be affected








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