Nylon Cutting Head, Servicing Instructions

NYLON CUTTING HEAD

Replacing the nylon cord

1First, stop the engine.

Press on the housing latches (A) inward to lift off the cover assembly (B). Then remove the spool (D).

2Remove any excess nylon cord from the spool.

3Cut a length of the nylon cord that is approximately 7.5 m ( 25’ ) long.

4Hook the center of new nylon cord into the notch (F) in the center of the spool, with one end of the cord extending about 80 mm (3” to 3-1/8”) more than the other. Then wind both ends firmly around the spool in the direction of the head rotation.

5Put the cord ends temporarily into the notched (H) when winding being finished. Leave approximate 100 mm (4”) of the cord extended beyond the notch.

6Place the spool into the cover. Remove the ends of the cord from the notches (H) and put them in the metal eyelets (I) on the cover.

7Mount the spool ( cover-assembly ) in the housing so that the grooves and protrusions on the spool mach up with those in the housing ( C ). Then push the cover firmly onto the housing to secure it.

		A
C		B
C	G	I
E
		H
F
		D

SERVICING INSTRUCTIONS

Before doing any work on the Brush Cutter/String Trimmer, always stop the engine and pull the plug cap off the spark plug.

STOP

Always wear protective gloves.

Do not attempt to remove the recoil starter by yourself, which may cause an accident. It should be done by the Authorized Service Agent.

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

Daily checkup and maintenance

Before operation, check the machine for loose screws or missing parts. Pay your special attention to the tightness of the cutting tool.

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

Do the following works daily after use :

-Clean the machine externally and inspect for damage.

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

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

-Check if there is sufficient difference between idling and engagement speed. Make sure that the cutting tool does not rotate while the engine is idling.

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

Cleaning of air-filter

-Remove screw (B).

-Remove the air filter cover (A). Take out the air-filter (C) and clean it in warm soapy water. Dry the air-filter completely.

-After cleaning, put back the air filter cover and fasten it with the screw.

Note :

If there is excessive dust or dirt adhering to the air filter, clean it every day. A clogged air filter may make it difficult or impossible to start the engine or increase the engine rotation-speed.

Checking the spark plug

Only use the supplied universal wrench to remove or 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 completely or replace it.

CAUTION :

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

0.6 mm – 0.7 mm

MS-231 C, MS-261 C, MS-331 U, MS-331 C, MS-261 U specifications

The Dolmar range of chainsaws, including the MS-261 U, MS-331 C, MS-331 U, MS-261 C, and MS-231 C, represents innovation and performance in outdoor power equipment. These models are engineered for both professional and recreational use, catering to various cutting needs.

The MS-261 U stands out with its lightweight design and powerful engine, offering a balance between efficiency and portability. It features a 50.2 cc engine that delivers robust power for various tasks, from tree trimming to felling. The AutoReturn choke system simplifies starting, while its anti-vibration technology ensures operator comfort during extended use.

The MS-331 C takes performance further with its larger 59 cc engine, designed for demanding applications. One of its key features is the M-Tronic technology, which automatically adjusts the fuel mixture for optimal performance in different conditions, ensuring consistent power and efficiency. Additionally, the saw is equipped with a system that allows for quick chain tensioning, reducing downtime and increasing productivity.

The MS-331 U combines the power of the MS-331 C with an ergonomic design suited for professional forestry work. This model is particularly designed for heavy-duty applications, featuring a larger fuel tank for extended running time. Its advanced vibration dampening system significantly reduces operator fatigue, making it ideal for long workdays.

In contrast, the MS-261 C is more compact and lightweight, making it a preferred choice for those who need versatility and maneuverability. This model integrates a Catalytic Converter, which not only enhances performance but also reduces emissions, making it an environmentally-friendly option. The inclusion of a premium air filter extends the intervals between maintenance, enhancing overall user experience.

Lastly, the MS-231 C is tailored for homeowners and light commercial use. Its efficient 45.6 cc engine is powerful yet easy to handle, making it perfect for casual users and those new to chainsaw operation. The Quick Stop chain brake and low vibration technology are standard features, promoting safety and comfort.

Overall, the Dolmar MS series combines innovative technologies and user-friendly features that cater to a wide audience, providing reliable solutions for cutting tasks ranging from casual yard work to professional logging operations. Each model emphasizes power, efficiency, and comfort, ensuring a productive experience for every operator.