Rok 150-85-50077 User manual

25CC PETROL LINE TRIMMER
150-85-50077
25CC PETROL LINE TRIMMER INSTRUCTION MANUAL
WARNING: For your safety, please READ and UNDERSTAND this manual before using.
Save these instructions for future reference.

SAFETY RULES AND PRECAUTIONS
Proper safety precautions must be observed. Like all power equipment, this unit must be handled carefully. DO NOT
EXPOSE YOURSELF OR OTHERS TO DANGER. Follow these general rules. Do not permit others to use this
machine unless they are thoroughly responsible and have read and understood the machine manual and are trained
in its operation.
This appliance is not intended for use by persons (including children with reduced physical, sensory or mental
capabilities, or lack of experience or knowledge, unless they have been given supervision or instruction concerning
use of the appliance by a person responsible for their safety. Children should not play unsupervised with the
appliance.
Always wear safety goggles for eye protection. Dress properly, do not wear loose clothing or jewellery that
could become caught in moving parts of the unit; safe, sturdy, non-skid footwear should always be worn.
Long hair should be tied back. It is recommended that legs and feet be covered to protect from flying debris
during operation.
Inspect the entire machine for loose parts (nuts, bolts, screws, etc) and any damage. Repair or replace as
necessary before using the machine. DO NOT USE any attachment with this power head other than the ones
recommended by our company. Serious injury to the operator or bystanders could result, as well as damage
to the machine.
Keep the handles free from oil and fuel.
Always grip the handle and the shoulder strap when cutting.
Do not smoke while mixing fuel or filling tank.
Do not mix fuel in an enclosed room or near open flames. Assure adequate ventilation.
Always mix and store the fuel in a properly marked container that is approved by local codes and ordinances
for such usage.
Never remove the fuel tank cap while the engine is running.
Never start or run the engine inside a closed room or building. Fumes from the exhaust contain dangerous
carbon monoxide.
Never attempt to make engine adjustments while the unit is running or strapped to the operator. Always make
engine adjustments with the unit resting on a flat, clear surface.
Do not use the unit if it is damaged or poorly adjusted. Never remove the machines guard. Serious injury to
the operator or bystanders could result as well as damage to the machine.
Inspect the area to by cut and remove all debris that could become entangled in the nylon cutting head. Also
remove any objects that the unit may throw during cutting.
Keep children away. Onlookers should be kept at a safe distance from the work area, at least 15 metres (50
feet).
Never leave the machine unattended.
Do not use this unit for any job other than those for which it was intended as described in this manual.
Do not overreach. Keep proper footing and balance at all times. Do not run the unit while standing on a
ladder or on any other unstable footing location.
Keep hands and feet clear of the nylon cutting head while unit is in use.
Do not use this type of machine for sweeping away debris.
Do not use the unit when you are tired, ill or under the influence of medication, drugs or alcohol.
Use nylon cutting head which is not damaged. If a stone or any object is hit, stop the engine and check the
nylon cutting head. A broken or unbalanced nylon cutting head must never be used.
FOLLOW INSTRUCTIONS FOR CHANGING ACCESSORIES.
Do not store in a closed area where fuel vapours can reach an open flame from hot water heaters, furnaces,
etc. Store in a locked, well ventilated area only.
Ensure safe and proper performance of your product. These parts are available from your dealer. The use of
other accessories or attachments may cause a potential hazard or injury to the user, damage to the machine
and void this warranty.
Clean the machine completely, especially the fuel tank and its surroundings, and the air cleaner.
When refuelling, be sure to stop the engine and confirm that it‟s cooled down. Never refuel when the engine
is running or hot. When petrol spills, be sure to wipe it up, and completely dispose of those materials before
starting the engine.

When approaching an operator of a machine, carefully call his or her attention and confirm that the operator
has stopped the engine. Be careful not to startle or distract the operator which can cause an unsafe situation.
Never touch the nylon cutting head when the engine is running. If it is necessary to adjust the protector or
nylon cutting head, be sure to stop the engine and confirm that the nylon cutting head has stopped running.
The engine should be turned off when the machine is moved between work areas.
Be careful not to hit the nylon cutting head against stones or the ground. Unreasonable rough operation will
shorted the life of the machine as well as create an unsafe environment for yourself and those around you.
Pay attention to loosening and overheating of parts. If there is any abnormality, of the machine, stop
operation immediately and check the machine carefully. If necessary, have the machine serviced by a dealer.
Never continue to operate a machine which may be malfunctioning.
In start-up, or during operation of the engine, never touch hot parts such as the muffler, spark plug or
surrounding areas.
After the engine has stopped, these areas are still hot. Never place the machinery in any places where there
are flammable materials (dry grass, etc), combustible gasses, or combustible liquids.
Pay special attention operation in the rain or just after rain, as the ground may be slippery.
If you slip and fall onto the ground or into a hole, release the throttle lever immediately.
Be careful not to drop the machine or hit it against obstacles.
Before starting to adjust or repair the machine, be sure to stop the engine and remove the spark plug.
When the machine is placed in storage for a long time, drain the fuel from the tank and carburettor, clean the
parts, move the machine to a safe place, and confirm that the engine is cooled down.
Make periodic inspections to ensure safe and efficient operation. For a thorough inspection of your machine,
please contact a mower shop.
Keep the machine away from fire and sparks.
GRAPHIC WARNINGS
Because a trimmer is a high speed, fast cutting power tool, special safety precaution must be observed to reduce the
risk of personal injury. Read this manual carefully. Be familiar with the controls and the proper use of this unit. Know
how to shut it off.
Always TURN OFF ENGNINE and make sure the cutting tool has stopped before cleaning, removing or adjusting
trimming line.
WARNING! Never modify a trimmer in any way.
Improper use of the machine can cause SERIOUS OR
FATAL PERSONAL INJURY.
WARNING! The engine exhaust form this product contains chemicals to cause cancer, birth defects, of other
reproductive harm, similar to an automobile.
Warning.
Read the instruction manual.
Wear eye protection, ear muffles and helmet.
Wear foot protection.
Wear glove to protect your hands.
Beware of foot injury by trimming line.
Beware of thrown objects hit by cutting attachment.
Never use without properly mounted guard.
Do not use blade.
Keep at least 15m away from any other person.
Trimming line in motion is dangerous and will harm the body if it connects with you.
Extremely hot surface. Do not touch a hot muffler, gear box or cylinder, you may get burned. These parts
get extremely hot from operation and remain hot for a short time after the unit is turned off.

Specifications, descriptions and illustrative material in this manual are as accurate as known at the time of publication,
but are subject to change without notice. Illustrations may include optional equipment and accessories, and may not
include all standard equipment.
QUICK START UP GUIDE: OPERATIONS –ENGINE STARTING AND STOPPING PROCEDURES
Starting cold engine: Start Stop
1. Move the start up switch to the „start‟ position.
2. Give a gentle, repeated push on the primer pump (7-10 times) until fuel comes into the primer pump.
Primer bulb
3. Pull lever up to close the choke.
(Closed is the choke position as marked on the unit).
Closed is choke position.
Open is the run position.
Control lever
4. Pull starter cord until engine flash fires.
Pull started handle until engine starts.
Starter cord
5. Push choke lever inwards (excessive cranking will flood the engine, making it difficult to start).
6. Allow engine to warm up for a few minutes before using.
Starting warm engine:
If the fuel tank was not run dry, pull starter 1-3 times and the engine should start.
Fuel tank
If tank was run dry, do not use choke, refill and repeat steps 3-5 for starting cold engine.
Stopping cold engine:
Move switch to stop position (refer top picture no. 1).

ASSEMBLY INSTRUCTIONS
Handle assembly:
The Delta Handle is attached to the shaft, but has been turned under for ease of packing.
Loosen the adjustment knob and rotate handle to the top of shaft position handle 6-1/2 to 8-1/2” from throttle
(Fig. 1)
Tighten adjustment knob securely.
Fig. 1
Debris Shield:
Shield fits snugly on shaft. Some force may be required.
Seat shield (B) onto shaft bracket (C). (Fig. 2A)
Insert washers (D) onto bolt. (Fig. 2B)
Insert bolt (E) and nut (F). (Fig. 2B)
Tighten securely. (Fig. 2B)
Installing the lower shaft:
Pack the aluminium tube into the connector inside.
Make the convex ball aim at the hole on the connector, and then turn the knob clockwise until tight.
Fig. 2A
Fig. 2B

DESCRIPTION
SAFETY MANUAL included in the unit. Read before operating, and keep for future reference to ensure that you learn
proper, safe operating techniques.
1. NYLON CUTTER HEAD: Contains replaceable nylon trimming line that advances when the trimmer head is
trapped against the ground while the head is turning at normal speed.
2. CUT-OFF KNIFE: Trims nylon filament to the correct length (7” head to end of line), when the nylon trimming
head is bumped on the ground during operation. If trimmer is operated without a cut-off knife, the line
becomes too long (more than 7”) and this can damage or overheat the engine.
3. DEBRIS SHIELD: This mounted just above the cutting attachment. This helps protect the operator by
deflecting debris produced during the trimming operation. Do not operate without the shield.
4. D-HANDLE: This can be adjusted at your convenience, for comfort.
5. DRIVE SHAFT ASSEMBLY: Contains a specially designed liner flexible drive shaft.
6. IGNITION SWITCH: “Slide switch” mounted on top of the throttle trigger housing. Move switch forward to run,
back to stop.
7. SAFETY LEVER: Please compress this before acceleration.
8. THROTTLE TRIGGER: Spring loaded to return to idle when released. When accelerating, press trigger
gradually, as this will give you the best operating technique. Do not hold trigger when starting.
9. PRIMER BULB: Pushing primer bulb (7 to 10 times before starting) will remove all air and stale fuel from fuel
system and bring fresh fuel to the carburettor.
10. FUEL TANK LID
11. FUEL TANK: Contains fuel and fuel filter.
12. AIR CLEANER COVER: Contains replaceable felt element.
13. CHOKE: The choke control is located on the top of the filter cover.
14. STARTER HANDLE: pull the handle until the engine started, then return handle slowly. DO NOT let handle
snap back, or damage to starter will occur.

CUTTING WITH A NYLON HEAD - TRIMMING
This is feeding the trimmer carefully into the material you wish to cut. Tilt the head slowly to direct debris away from
you. If cutting up to a barrier such as fence, wall or tree, approach from an angle where any debris ricocheting off the
barrier will fly away from you, Move the line head slowly until the grass is cut right up the barrier, but do not jam
(overfeed) the line into the barrier. If trimming up to a wire mesh or chain linked fence be careful to feed only up to
wire. If you go too far, the line will snap off around the wire. Trimming can be done to cut through weed stems one at a
time. Place the trimmer line head near the bottom of the weed-never high up which could cause the weed to chatter
and catch the line. Rather than cut the weed right through, just use the very end of the line to wear through the stem
slowly.
WARNING DANGER
Scalping and edging:
Both these are done with the line head tilted at a steep angle.
Scalping is removing the top growth, leaving the earth bare. Edging is trimming the grass back where it has spread
over a sidewalk or driveway.
During both edging and scalping, hold the unit a steep angle and in a position where the debris, and any dislodging
dirt and stones, will not come back towards you even if it ricochets off the hard surface. Although the picture shows
how to edge and scalp every operator must find for himself the angles which suits his body size and cutting situation.
WARNING DANGER
Do not trim in any area where there are strands of fencing wire. Wear protective safety clothing. Do not cut where you
cannot see what the cutting device is cutting.
CUTTING WITH A NYLON HEAD
For almost all cutting, it‟s good to tilt the line head so that contact is made on the part of the circle where the line is
moving away from you and the debris shield. (See appropriate image).
WARNING DANGER
Tilting the head to the wrong side will shoot the debris towards
you. If the line head is held flat to the ground so that cutting occurs
on t he whole line circle, debris will be thrown at you, drag will slow t he
engine down, and you will use up a lot of line.
The line head rotates in a clockwise direction. The cut-off knife will
be on the right side of the debris shield.
WARNING DANGER
Use only quality nylon monofilament line with a 2mm diameter
Never use wire or in place of nylon trimmer line. Load your nylon line
cutting head only with nylon trimmer.
WARNING DANGER
Use extreme caution when operating over bare spots and gravel,
because the line can throw small rock particles at high speeds.
Debris shields on the unit cannot stop objects which bounce or
ricochet off hard surfaces.
WARNING DANGER
The proper debris shield must be in place on the unit when nylon cutting line is used, the cutting line can flap around if
too much line is exposed. Always use the plastic debris shield with cut-off knife when using nylon cutting heads.

FITTING OF TRIMMER LINE
1. Holding trimmer head cup firmly, loosen and remove the bump feed lock knob with the two (2) prong spanner
in an anticlockwise direction.
2. Divide a 6mt length of 2.00mm trimming line in half and place centre of halved line into the holding slot in the
centre ring of the line carrier.
3. Feed each length of halved line (in a clockwise direction) onto each section of the line carrier.
4. When line is coming to the end, lock each end of the line into the mounting pins of line carrier at opposite
sides 180° apart.
5. Feed each end of locked trimming line through trimmer head cup eyelets and place bump spring between
inside base of trimmer head cup and line carrier.
6. Squeeze both halves together, hold firmly and place refilled trimmer head onto machine, locking the assembly
in place with the bump feed lock knob (turning in a clockwise direction).
7. Pull each length of line further through the eyelet holes and your trimmer is ready for use again.

RULES FOR SAFE OPERATION
WARNING DANGER
All model trimmers can throw small stones, metal or small objects, as well as the material being cut. Read these
Rules for Safe Operation with care. Follow the instructions in your operator‟s manual.
Read the operators manual carefully. Be thoroughly familiar with the controls and proper use of the unit. Know how
to stop the unit and shut off the engine. Know how to unhook a harnessed unit quickly.
Never allow anyone to use the unit without proper instruction. Be sure the operator wears the foot, leg, eye, face and
hearing protection recommended to protect them from thrown objects. Keep the area clear of bystanders, children
and pets. This appliance is not intended for use by persons (including children with reduced physical, sensory or
mental capabilities, or lack of experience or knowledge, unless they have been given supervision or instruction
concerning use of the appliance by a person responsible for their safety. Children should not play unsupervised with
the appliance.
Do not allow anyone to enter the operating danger zone with you. The danger zone is an area 15 metres in radius
(about 16 paces) or 50 feet.
Insist that persons in the risk zone, beyond the danger zone wear eye protection to protect against thrown objects. If
the unit must be used where there are unprotected people, operate at a low throttle speed to reduce the risk of thrown
objects.
Move the stop switch to the „o‟ position when the engine idles, and ensure it is reliable before cutting. Only operate
the unit when the stop switch is in good condition. Routinely check that the cutting attachment stops turning when the
engine idles.
WARNING DANGER
In addition to head, eye, face and ear protection, also wear shoes to protect your feet and improve your footing on
slippery surfaces. Do not wear ties, jewellery, or any loose clothing which could be caught in the unit.
Do not wear open-toed footwear, or go barefoot and bare legged. In certain situations you must wear total face and
head protection.
NO PERSON EXCEPT THE OPERATOR IS ALLOWED IN THE DANGER ZONE (15 METRE RADIUS). EYE, EAR,
FACE, FOOT, LEG AND BODY PROTECTION MUST BE WORN BY THE OPERATOR. PERSONS IN THE RISK
ZONE (BEYOND THE DANGER ZONE) SHOULD WEAR EYE PROTECTION AGAINST THROWN OBJECTS.
RISK DIMINISHES WITH DISTANCE FROM THE DANGER ZONE.
FUEL AND OIL MIXTURE
Never fill the tank to the very top.
Never add fuel to the tank in a closed, non-ventilated area.
Do not add fuel to the unit close to an open fire or sparks.
Be sure to wipe off any spilled fuel before starting the engine.
Do not attempt to refuel while the engine is hot.
Fuel used for this model is a mixture of unleaded gasoline and approved engine lubricant. When mixing gasoline with
two cycled engine oil, use only gasoline which contains no ethanol or methanol (types of alcohol). Use branded 89
octane or higher. Unleaded gasoline is known to be of good quality. This will help to avoid possible damage to
engine fuel lines and other engine parts. A calibrated fuel / oil mixing container is included in the kit for correct fuel
mixing.

Mixture ratio is 40:1
Gasoline = 40 parts
Oil = 1 part
Fuel mixture at the rate other than 40:1 may cause damage
to the engine, so ensure the ratio is correct.
FUEL: The engine uses two stroke fuel - a mixture of gasoline and two stroke engine lubricant (mixed 40:1).
IMPORTANT: Two-stroke fuel may separate. Shake fuel container thoroughly before each use. Stored fuel ages, so
do not mix more fuel than you expect to use within a month.
GASOLINE: Use branded 89 octane or higher unleaded gasoline known to be of good quality.
FUEL AND OIL MIXTURE: Inspect fuel tank making sure that it is clean and fill with fresh fuel. Use a mixture of 40:1.
STORING FUEL: Store fuel only in a clean, safe and approved container. Check and follow local ordinances on type
and location of storage container.
Oil –1 part
Gasoline –40 parts