Dolmar MS-22C User Manual

1.87 Mb

English / Français / Spanish C

String Trimmer









Read this instruction manual carefully before putting the String Trimmer into operation and strictly observe the safety regulations. Preserve instruction manual carefully.

Recommandation importante:

Lire soigneusement ce manuel d’instructions avant de mettre la tail-bordures en service et observer rigoureusement les consignes de sécurité! Conserver soigneusement ce manuel d’instructions.


Leer cuidadosamente este manual de instrucciones antes de poner en marcha la máquina y observar estrictamente las normas de seguridad.

Conservar este manual de instrucciones con cuidado.


Thank you very much for purchasing the DOLMAR String Trimmer. We are pleased to recommend to you the DOLMAR String Trimmer which is the result of a long development programme and many years of knowledge and experience.

Please read this booklet which refers in detail to the various points that will demonstrate its outstanding performance. This will assist you to obtain the best possible result from your DOLMAR String Trimmer.

Table of Contents


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


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


Specification ...............................................................


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


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


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


Mounting of protector .................................................


Mounting of nylon cutting head .................................


Fuels/Refueling ..........................................................


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


Putting into operation ................................................


Idle adjustment ..........................................................


Nylon cutting head ....................................................


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


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


Federal emission component defect warranty .........



You will note the following symbols when reading the instruction manual.


Read instruction Manual

Do not use metal blades






Take Particular Care and Attention


Top permissible tool speed






10000 /min









Fuel and oil mixture

Keep distance

Engine-Manual start

Flying object hazard

Emergency stop

No smoking

First Aid

No open flame


Protective gloves must be worn

Keep the area of operation clear of other



persons and pets



Wear eye and ear protection








General Instructions

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

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

Children and young persons aged under 18 years must not be allowed to operate the string 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 string trimmers with the utmost care and attention.

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

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

Intended use of the machine

The String Trimmer is only intended for cutter grass, weeds, Bushes, undergrowth it should not be used for any other purpose such as Edging or hedge cutting as this may cause injury.

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 string 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 the approved protective helmets.

The visor (2) of the helmet (or alternatively goggles) protects the face from flying debris and stones. During operation of the string 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 string trimmer.

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

Starting up the string 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 string trimmer is safe for operation: Check the security of the nylon cutting head, the control lever for easy action.

Rotation of the nylon cutting head 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 string trimmer only in accordance with the instructions. Do not use any other methods for starting the engine!

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

Only start the string 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 nylon cutting head 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 nylon cutting head hit stones or other hard objects, immediately switch off the engine and inspect the nylon cutting head.

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

Operate the string trimmer only with the shoulder strap attached which is to be suitably adjusted before putting the string trimmer into operation. It is essential to adjust the shoulder strap according to the use’s size to prevent fatigue occurring during use.

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

Operate the string trimmer in such a manner as to avoid inhalation of exhaust gas. 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 string trimmer unattended, and place it in a safe location to prevent danger to others or damage to the machine.

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

The nylon cutting head has to be equipped with it’s appropriate guard. Never run the trimmer without this guard.

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 string trimmer during car transportation to avoid fuel leakage.

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

When unloading the String 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 String Trimmer to the ground or this may severely damage the String 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 car not to spill either fuel or oil in order to prevent soil contamination (environmental protection). Clean the string 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 explosion).

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

Never cut above the waist height.

Never stand on a ladder and run the string trimmer.

Never climb up trees to perform cutting operation with the string trimmer.

Never work on unstable surfaces.

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

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

Cutting Tools

Employ only the correct nylon cutting head for the job in hand.

For cutting thick materials, such as weed, high grass, bushes, shrubs, underwood, thicket etc. (max. 2 cm dia. thickness). Perform this cutting work by swinging the string trimmer evenly in half-circles from right to left (similar to using a scythe).

Maintenance instructions

The condition of the trimmer also of the shoulder strap must be checked before commencing work.

Turn off the engine and remove the spark plug connector when replacing, and also when cleaning the nylon cutting head.

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

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

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

Always store the string 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 string 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 the 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 nylon cutting heads and fixing devices of nylon cutting heads, 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









Dimensions : length x width x height (without nylon cutting head)


1735 x 235 x 220 (68-1/4” x 9-1/4” x 8-5/8”)




Mass (without plastic guard and nylon cutting head)






Volume (fuel tank)






Engine displacement






Maximum engine performance


0.83 /7000 /min




Engine speed at recommended max, spindle speed






Maximum spindle speed (corresponding)






Idling speed






Clutch engagement speed






Carburetor (Diaphragm - carburetor)






Ignition system


Solid state ignition




Spark plug






Electrode gap








Mixed gas (gasoline : two stroke oil = 50 : 1)




Gear ratio






1) The data is prepared taking equally into account the idling and recing or wide open throttle speed operating modes.

* WARNING: MODEL MS-22C must not be used with a metal blade.




String Trimmer










Fuel Tank






Rewind Starter




Air Cleaner cover




I-O Switch (on/off)




Spark Plug




Exhaust Muffler




Clutch Case




Rear Grip

















Control Lever




Control Cable











Gear Case/Head Case




Nylon Cutting Head



Fuel Filler Cap





Starter Knob




Exhaust Pipe







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

CAUTION: Start the string trimmer only after having assembled it completely.

Insert the drive shaft into the holder case (Fig).

Note: Always insert the drive shaft into the Clutch case fully (approx. 58 mm). If the inner shaft resists full insertion of the drive shaft, try to insert it again after slightly rotating the drive shaft or the support washer on the gear case to match the inner shaft to the hole inside the holder case.

After making sure that the drive shaft is installed fully and properly, tighten the socket head bolt (M5 x 14) and socket head bolt (M5 x 25) to secure the drive shaft.

–Inset control cable (1) through adjusting cable (2) and fit nipple of control cable into swivel (3) of carburetor.

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

– Fix the cord connector by clamp.

Clutch case



Drive shaft

head bolt

head bolt


(M5 x 14)

(M5 x 25)










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

CAUTION: Start the string trimmer only after having assembled it completely.

For machine with Loop handle

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

–The standard position of the handle is 200mm to 250mm from the hanger.

to engine



To meet the applicable safety provisions, only the tool/protector combinations as indicated in the table must be used.

Be sure to use genuine DOLMAR nylon cutting head.

Nylon cutting head

Protector for cord cutter



If the nylon cutting head hits against a stone during operation, stop the engine and check the nylon cutting head immediately.

CAUTION: The appropriate protector must always be installed, for your own safety and in order to comply with accident-prevention regulations.

Operation of the equipment without the guard being in place is not permitted.

–Fix the protector (1) to the clamp (3) with two bolts M6 x 30 (2).

–When using the string head, fit the protector (6) into the protector (1), and tighten them with two nuts (5) and two screws (4).



Turn the machine upside down, and you can replace the nylon cutting head.

Insert the hex wrench through the hole in the gear case and rotate the receiver washer (3) until it is locked with the hex wrench.

Loosen the nut (1) (left-hand thread) with the socket wrench and remove the nut (1), and clamp washer (2).

NOTE:The clamp washer (2), and nut (1) are not necessary for mounting the nylon cutting head. The nylon head should go on top of the receiver washer (3).

– Screw the nylon cutting head onto the shaft.



Hex wrench

– Make sure that the blade is the left way up.




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

Inspect the fuel tank and fill with clean, fresh fuel of the proper mixture to assure the longer life of the tool.

Use the following mixed gas.

Gasoline : DOLMAR genuine two-stroke engine oil = 50 : 1 or Gasoline : Other Maker’s Two-stroke engine oil = 25:1

Observe the Safety Instructions on page 4 !



When mixing gasoline with two-stroke engine oil. use only unleaded gasoline which contains no ethanol, or methanol (type of alcohol).

This will help to avoid possible damage to engine fuel lines and other engine parts.

Do not mix gasoline and oil directly in the fuel tank.

IMPORTANT: Failure to follow proper fuel mix instructions may cause damage to the engine.

CAUTION: 1. When preparing fuel mixture, mix only the amount needed for the job you aref to do.

Do not use fuel mixture that has been stored longer than two months.

Fuel mixture stored longer than two months will cause hard starting and poor performance.

If fuel mixture has been stored longer than this time, if should be removed and filled with a fresh mixture.

2.Never fill the fuel tank to the very top.

3.Never add the fuel to the tank in a closed unventilatede area.

4.Do not add fuel to this unit close to an open fire or sparks.

5.Be sure to wipe off spilled fuel before attempting to start the engine.

6.Do not attempt to refuel a hot engine.

Check points before operation

1.Check for loose bolts, nuts and fittings.

2.Check the air cleaner for dirt. Clean the air filter of all dirt, etc. before operation

3.Check to be sure that protector is securely in place.


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.



Attachment of shoulder strap

Adjust the strap length so that the cutter blade will be kept parallel with 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 (1) vicinity.

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



Observe the applicable accident prevention regulations.


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

Cold start

For machine with Loop Handle


– 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 (1) repeatedly (7-10 times) until fuel comes into the primer pump.

Push the choke button (2) 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 starts, please open the throttle lever a little. The choke button being automatic, it returns to original position " ".

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


Note: – If the starter knob is pulled repeatedly when the choke button 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 knob slowly to remove excess fuel. Also, dry the electrode section of the spark plug.

Caution during operation:

If the control lever is opened fully in a no-load operation, the engine rotation is increased to 10,000 rpm 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

– As described above, except without moving the choke button.


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 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 3,000 / min.

If necessary correct it by means of the idle screw (the nylon cutting head 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.

Slow High


The nylon cutting head is a dual string trimmer head capable of bump & feed mechanisms.

The nylon cutting head will automatically feed out the proper length of nylon cord by the changes in centrifugal force caused by increasing or decreasing RPMS. However, to cut soft grass more efficiently, bump the nylon cutting head against the ground to feed out extra cord as indicated under operation section.

Most effective cutting area


Increase the nylon cutting head speed to approx. 6,000 / min.

Low speed (under 4,800 / min) is not suitable, the nylon cord will not feed out properly at low speed.

The most effective cutting area is shown by the shaded area.


If the nylon cord does not feed out proceed as follows:

1.Release the control lever to run the engine idle and then squeeze the control lever fully. Repeat this procedure until the nylon cord feeds out to the proper length.

2.If the nylon cord is too short to feed out automatically with the above procedure, bump the knob of the nylon cutting head against the ground to feed out the nylon cord.

3.If the nylon cord does not feed out with procedure 2, rewind/replace the nylon cord by following the procedures described under “Replacing the nylon cord”.

Replacing the nylon cord

First, stop the engine.

Press on the housing latches inward to lift off the cover, then remove the spool.

Hook the center of new nylon cord into the notch in the center of the spool, with one end of the cord extending about 80mm (3-1/8") more than the other. Then wind both ends firmly around the spool in the direction of the head rotation (left-hand direction indicated by LH and right-hand direction by RH on the side of the spool).

Wind all but about 100mm (3-15/16") of the cords, leaving the ends temporarily hooked through a notch on the side of the spool.

Mount the spool in the housing so that the grooves and protrusions on the spool match up with those in the housing. Keep the side with letters on the spool visible on the top. Now, unhook the ends of the cord from their temporary position and feed the cords through the eyelets to come out of the housing.

Idle speed

Full speed











For left hand rotation






Align the protrusion on the underside of the cover with the slots of the eyelets.

Then push cover firmly onto the housing to secure it.



Slot of eyelet


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

Always wear protective gloves!

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 nylon cutting head.

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 string trimmer externally and inspect for damage.

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

Check the nylon cutting head for damage and make sure it is firmly mounted.

Check that there is sufficient difference between idling and engagement speed to ensure that the nylon cutting head 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

Clogging of the element (1) may sometimes make it difficult or impossible to start up the engine or increase the engine speed.

After the end of operation, be sure to clean the air cleaner as mentioned below.

– Remove the air cleaner cover screw.


– Place the finger under the air cleaner cover, push down the cover lower


part, and detach the air cleaner cover.



– Take out the element (1), clean it with lukewarm water mixed with neutral


detergent, and dry it completely.


After cleaning, attach the element.

Insert the claw at the case upper part into the hole at the upper part of the air cleaner cover. Then, attach the air cleaner cover by pushing it, and tighten the screw (2).

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 - 0.7 mm (0.024" - 0.028"). If the gap is too wide or too narrow, adjust it. If the spark plug is clogged with carbon or fouled, clean it thoroughly or replace it.

CAUTION: Never touch the spark plug connector while the engine is running (danger of high voltage electric shock).

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.)

Suction head in the fuel tank

– The felt filler (1) of the suction head is used to filler the fuel required by the




– A periodical visual inspection of the felt 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 felt filter at least quarterly


to ensure satisfactory fuel supply to the carburetor.



Cleaning of muffler exhaust port

Check of muffler exhaust port (2) regularly.

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

Gear case

Grease hole


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


+ 37 hidden pages