Forest-Master FM6DD-MUL User manual

Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL
IMPORTANT: Read this manual fully before assembly and
use and observe all safety rules and operating instruc-
tions
Forest Master Direct
Drive Garden Mulcher
FM6DD-MUL
FM4DDE-MUL

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL
2
Your Product
Thank you for purchasing the Forest Master Direct Drive Mulcher. We hope you are
100% satisfied with your product but if you have any questions or queries, please
don’t hesitate to contact us:
Forest Master Ltd Sales Tel: [phone]
Industry Road Email: [email protected]
Heaton Website: www.forest-master.com
Newcastle Upon Tyne Technical Enquiries Tel: [phone]
NE6 5XB
About Your Product
This manual is for models:
FM6DD-MUL - 6hp Petrol Engine
FM6DDES-MUL - 6hp Petrol Engine with Electric Start
FM4DDE-MUL - 4hp Electric Motor
The FM6DD-MUL, FM6DDES-MUL and FM4DDE-MUL are garden mulchers designed
to mulch weeds, greens, leaves, animal fodder, beet, potatoes, carrots, apples,
etc. They will also mulch cardboard & paper. NOTE: Do not insert garden waste
that contains stones, plastic, metal or any other objects may damage the blades
Cardboard and paper must be free of staples.
Please thoroughly read the safety instructions and guidelines and make sure you
are familiar with them before use.
CE Regulation Parts
To comply with CE regulation (countries within the EU), the Hopper Safety Plate (9)
must be installed for your own safety (Check exploded diagram for parts).
For non-CE regulation (e.g. use in the United States or outside of Europe) these
parts can be removed to make the mulcher easier to use, but at the risk of your own
safety. Forest Master Ltd will accept no responsibility for injuries caused by using
the mulcher without these parts installed.
The drum can be rotated to change the angle of the feed hopper and the discharge
chute. Note however that for CE regulations the exit of the discharge chute should
be no more than 30mm from the ground. The chipper is shipped with the drum set
at the correct position for this.

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL 3
Contents
Contents
Title Page No.
Specifications 4
Safety Instructions 5
Assembly 8
Operation 13
Maintenance 17
Troubleshooting 18
Warranty 21
Exploded Diagram (FM6DD-MUL/FM6DDES-MUL) 22
Parts List (FM6DD-MUL/FM6DDES-MUL) 23
Exploded Diagram (FM4DDE-MUL) 24
Parts List (FM4DDE-MUL) 25

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL
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Specifications
Specification FM6DD-MUL / FM6D-
DES-MUL
FM4DDE-MUL
Engine/Motor LCT Maxx 6hp 208cc 4
Stroke
Forest Master 4hp
2800W Electric Motor
Fuel/Input Petrol 230V
Mulcher Blade Twin Reversible Blades Twin Reversible Blades
Overall Height 780mm 780mm
Overall Length 910mm 910mm
Overall Width 480mm 390mm
Weight 38kg 35kg
Max Drum RPM 3600rpm 2800rpm
Max Feed Diameter 50mm / 2” 50mm / 2”
Starting Mechanism Pullstart / Electric Start N/A

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL 5
Safety
General Safety
• The person using the machine must have adequate knowledge of the functioning
and operation of the machine and must have read the manual.
• Operators must be over the age of 18 and must not be under the influence of
alcohol, drugs or any other substance that has an adverse effect on reaction
speed.
• The material to be fed into the machine should only be garden waste, etc, that is
free from nails, screws etc.
• The machine should be positioned on dry, level ground in the proper upright
position and there must be no tripping or slipping hazards in the vicinity that
could cause harm to the operator.
• Make sure the blades are in good condition and secure.
• Check that all bolts are tight and secure, especially on the hopper and discharge
chute.
• Only use the mulcher in adequate lighting (i.e. sunlight or sufficient artificial
light).
• Never use either the petrol or electric mulcher in the rain.
Operation Safety
• When operating the mulcher, always wear gloves, ear defenders, helmet and
visor or safety glasses and appropriate clothing. Do not wear loose clothing or
jewellery.
• The mulcher should be operated by one person only. Any other bystanders must
always be at least 50 feet from the work area.
• Do not operate the FM6DD-MUL inside or in a confined space; the exhaust from
the engine contains carbon monoxide which is poisonous.
• Never overload or attempt to mulch waste beyond the manufacturer’s
recommendation. It could result in personal injury or damage to the machine.
• Never place any part of your body inside the feed hopper or the discharge chute.
Fragments of garden waste that have not self-fed into the machine should only
be pushed with other garden waste that you are feeding into the mulcher.
• If the mulcher gets jammed you must immediately stop the engine or motor.
• Obstructed fragments inside the hopper should only be removed when the motor
is turned off and the drum has stopped rotating.
• Never leave the mulcher unattended while the motor is running.
• Never move in front of the discharge chute.
• Ensure no fragments remain inside the mulcher when turning it off.
• Always take into account the time delay needed from switching the machine off
for the knife drum to come to a halt.
Safety Instructions

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL
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• If the machine starts to make an unusual noise or vibrate, shut down the engine,
disconnect the spark plug wire (FM6DD-MUL) or plug socket (FM4DDE-MUL),
wait 5 minutes for the engine or motor to cool down, then inspect for damage.
Vibration is generally a warning of trouble. Check damaged parts and clean,
repair and/or replace as necessary.
• If the machine topples over during operation, immediately turn off the engine or
motor and for the FM4DDE-MUL model, disconnect the power cable.
• When using the FM4DDE-MUL, always use on a circuit that has an RCD to prevent
the chance of an electric shock.
Safety with Maintenance
• Inspection and maintenance must be done with the motor and driving unit
switched off and the spark plug cap removed (FM6DD-MUL) or power cable
(FM4DDE-MUL) disconnected. Wait 5 minutes for the engine or motor to cool
down.
• Any worn or damaged parts must be replaced, to ensure that the mulcher
is maintained and in a safe state. Only use Forest Master spare parts for
replacements. Contact us to arrange.
• Never use the mulcher with damaged or worn cables.
• Never, under any conditions, remove, bend, cut, fit, weld or otherwise
alter standard parts on the mulcher. This includes all shields and guards.
Modifications to your machine could cause personal injuries and property
damage and will invalidate your warranty.
• Never use a pressure washer or running water to clean the engine or motor. This
might lead to water ingress in the engine or the bearings (invalid warranty). Do
not use any aggressive cleaning products. The inside of the feed and discharge
chutes and drum can be cleaned with a pressure washer.
• Never transport the mulcher with the motor still running.
• Prior to transport, use appropriate fixing materials to fasten the mulcher to the
fixing points on the load surface.
• Prior to storing the machine, make sure that it has been restored to a sufficient
state (i.e. clean and free from debris). Apply oil to the knives, the knife drum
and the bearings to protect them from corrosion. This is especially the case for
storage during long periods of inactivity of the appliance.
• Store the machine in a dry, closed room, out of children’s reach.
Safety

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL 7
Safety
Safety with Petrol (FM6DD-MUL)
Petrol is a highly flammable liquid. Petrol also gives off flammable vapour that can
be easily ignited and cause a fire or explosion. Never overlook the hazards of petrol.
Always follow these precautions:
• Never run the engine in an enclosed area or without proper ventilation as the
exhaust from the engine contains carbon monoxide, which is an odourless,
tasteless and a deadly poisonous gas.
• Store all fuel and oil in containers specifically designed and approved for this
purpose and keep away from heat, open flame and the reach of children.
• Replace rubber fuel lines and grommets when worn or damaged and after 5
years of use.
• Fill the petrol tank outdoors with the engine off and allow the engine to cool
completely. Don’t handle gasoline if you or anyone nearby is smoking, or if
you’re near anything that could cause it to ignite or explode. Re-install the fuel
tank cap and fuel container cap securely.
• If you spill petrol, do not attempt to start the engine. Move the machine away
from the area of the spill and avoid creating any source of ignition until the gas
vapours have dissipated. Wipe up any fuel to prevent fire hazard and properly
dispose of the waste.
• Allow the engine to cool completely before storing in any enclosure. Never store
a machine that has gas in the tank, or a fuel container, near an open flame or
spark such as a water heater, space heater, clothes dryer or furnace.
• Never make adjustments or repairs with the engine running. Shut down the
engine, disconnect the spark plug wire, keeping it away from the spark plug
to prevent accidental starting, wait 5 minutes before making adjustments or
repairs.
• Never tamper with the engine’s governor setting. The governor controls the
safe operation speed and protects the engine. Over-speeding the engine is
dangerous and will cause damage to the engine and to the other moving parts
of the machine. If required, see your authorised dealer for engine governor
adjustments.
• Keep combustible substances away from the engine when it is hot.
• Never cover the machine while the exhaust is still hot.
• Do not operate the engine with the air cleaner or carburettor air intake cover
removed. Removal of such parts could create a fire hazard. Do not use flammable
solutions to clean the air filter.
• The exhaust and engine become very hot and can cause a severe burn; do not
touch.
This list of warnings and cautions cannot be all-inclusive. If situations occur
that are not covered by this manual, the operator must apply common sense and
operate the mulcher in a safe manner. Contact the dealers for assistance in your
area.

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL
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Assembly
Assembly
Note that the majority of bolts specified are loosely fitted in their correct loca-
tion for shipping.
1. Lay all the parts out flat in a suitable assembly area and check to make sure all
parts are there.
2. Slide the axle (46) into the square tubing of the base (42) and place a 16mm flat
washer (47) on each end of the axle.
3. Next, place the wheels (43) on each end of the axle (46) and secure with a split
pin (45) through the small holes on the outer of the axle (46).
4. Finally, place each dome cap (48) on the ends of the axle (46) and secure the cap
by tapping it with a mallet or hammer.
42
46
47
45
43
48
45
47
43
48
Part Name Part
No. Qty.
Engine/Motor with Drum 60 1
Base 42 1
Feed Hopper 1 1
Discharge Chute 34 1
Axle 46 1
Wheels 43 2
Split Pin 45 2
16mm Washer 47 2
Dome Cap 48 2
M8x35 Bolts 56 4
Part Name Part
No. Qty.
M8 Washers 33 8
M8 Spring Washer 30 4
M8 Nut 57 4
M8x110 Bolt 49 2
M8 Serrated Washer 55 2
M6x23 Bolt 51 1
M6 Washer 41 3
M6 Spring Washer 59 3
M6x12 Bolt 50 2
M3 x 60 Bolt 39 2
M3 Nut 40 2
Assembly Parts

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL 9
Assembly
5. Place the engine/motor (60) on top of the base (42), lining the engine/motor
mounting holes with the bolt holes of the base.
6. Fastening the engine and motor through the following methods:
Engine (FM6DD-MUL/FM6DDES-MUL)
For the electric start FM6DDES-MUL, see page 10 for instructions on mounting
the battery tray, this is secured using the bolts that also secure the engine so
must be attached at the same time.
Fasten the engine (60) with the M8 bolts (56), M8 washers (33), M8
spring washers (30) and M8 nuts (57). The order of assembly is:
[Bolt] – [Washer] – [Base] – [Engine] – [Washer] – [Spring Washer] – [Nut].
Motor (FM4DDE-MUL)
Fasten the motor (60) with the M8 bolts (56), M8 washers (33) and M8 Lock Nuts
(57). The order of assembly is:
[Bolt] – [Washer] – [Base] – [Motor] – [Washer] – [Lock Nut].
60
56
33
42
33
30
57
42
60
56
33
33
57
FM6DD-MUL FM4DDE-MUL

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL
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Assembly
FM6DDES-MUL Battery tray attachment
Part Name Part
No. Qty.
Battery Tray 70 1
M5x125 Bolt 71 2
M5 Nut 72 2
Battery 73 1
Ignition Key 74 2
Attach the battery tray (70) to the underside of the base (42) using the 4 M8x35
bolts (56) and 4 M8 washers (33) that also secure the engine to the base.
Connect the battery wires to the terminals on the battery (red to positive(+)). Place
the battery on the tray and secure using the two M5 x 125 bolts (71) and nuts (72).
70
56
33
71
72
56
33

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL 11
7. Place the feed hopper (1) on the drum housing (14) so that the flange on the
upper face of the feed hopper between the top face of the drum housing and the
upper drum mounting bolt.
8. Fasten the bottom of the feed hopper (1) to the drum housing (14) using the
M6 bolts (51) the M6 washer (41) and the M6 spring washer (59). There is a
thread in the drum housing to fasten the bolt into. The order of assembly is:
[Bolt] – [Spring Washer] – [Washer] – [Feed Hopper] – [Drum Housing].
Assembly
1
14
51
41
59

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Assembly
9. Slide the discharge chute (63) up under the drum housing (14)and insert the
flange on the top edge of the discharge chute between the lower face of the
drum housing and the rearmost lower drum mounting bolt. The two bolts on the
top of the chute should locate through the two holes on the drum flange.
10. Fasten the two bolts on the discharge chute (63) to the top of the drum housing
(14) using the M6 nuts (38), M6 spring washers (59) and M6 washers (41). The
order of assembly is: [Nut] – [Spring Washer] – [Washer] – [Discharge Chute] –
[Drum Housing].
11. If in the EU/UK fit the 2 M3x60
bolts (39) and M3 nuts (40)
through the holes in end of the
discharge chute.
12. The petrol engine is shipped
dry of oil. It must be filled
with 600ml of oil before use.
It must be filled with the
mulcher on level ground, do
not tilt it. It is recommended
to use 5W-30 in winter and
10W-30 in summer.
63
14
38
59
41
STEP 9 STEP 10
M3x60 BOLTS

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL 13
• Position your mulcher on flat, dry ground and make sure the machine cannot be
moved.
• Before starting, manually turn the drum to make sure it is not obstructed and
moves smoothly. Twist off (anticlockwise) the black plastic cover in the centre of
the drum housing. Using your forefinger and thumb to grasp the hexagonal part
of the drum shaft (not the black bolt in the centre), rotate the drum both ways,
it should turn easily. With the FM6DD-MUL & FM6DDES-MUL you cannot turn the
drum all the way round but you should be able to turn partially both ways. Do
not use a socket to rotate it.
• Before starting the lower hopper bolt (51) must be nipped tight by hand or the
mulcher will not start. Tighten by a 1/4 turn at a time until it starts.
Engine Operation for FM6DD-MUL/FM6DDES-MUL Petrol Mulcher
DO NOT START THE ENGINE FOR THE FIRST TIME WITHOUT FILLING WITH 600 ml
OF OIL. The engine may have oil residue but the engine is not supplied pre-filled.
Operation
Operation
STARTING THE ENGINE
FM6DD-MUL Pull Start
• Make sure the fuel shut-off valve is in the “ON” position.
• Move the choke control lever to the “CHOKE” position (should only be needed if
the engine is cold or not starting).
• Move the throttle control lever to the “FAST” position.
• Turn the ignition switch to the “ON” position.
• Grasp the recoil starter handle and slowly pull until you feel resistance. If the
pull start is tight on the FM6DD-MUL, the mulcher has a blockage and should be
cleared before starting. Let the cord retract a little bit then pull the cord rapidly
to start the engine. One or two pulls usually starts the engine.
• Move the choke lever (if used for cold engine) slowly back to the “RUN” position
when the engine is running well.
• Warm up the engine by running the engine at half throttle for 1 to 2 minutes,
then advance the engine throttle control to mulching speed.
USE TO TURN
DO NOT TURN

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL
14
NOTE: Higher revs does not necessarily mean more
torque to the blade drum. As you can see from
the power map, the highest amount of torque is
achieved around the 2500 rpm mark, and therefore
is the most efficient speed to maintain the engine
for mulching. We advise you do not increase the
revs to the maximum for mulching unless required,
as this works the engine harder for less results and
could shorten the long-term life span of the engine
(and use more petrol).
Operation
FM6DDES-MUL Electric Start
• Make sure the fuel shut-off valve is in the “ON” position.
• Move the choke control lever to the “CHOKE” position (should only be needed if
the engine is cold or not starting).
• Move the throttle control lever to the “SLOW/IDLE” position.
• Before starting your FM6DDES-MUL, you should test the pull start to ensure that
the cord isn’t tight.
• Turn the ignition key to the “Start” position. As soon as the engine starts, allow
the key to turn back to the “Run” position. If the engine does not start straight
away, DO NOT HOLD THE KEY IN THE “START” POSITION AS YOU WILL FLOOD
THE ENGINE.
• Move the choke control lever (if used for cold engine) slowly back to the “RUN”
position when the engine is running well.
• Warm up the engine by running the engine at half throttle for 1 to 2 minutes,
then advance the engine throttle control to the maximum speed.
• If the electric start does not turn the engine over then the battery may have
insufficient charge. Start the engine using the pull start. The engine will trickle
charge the battery, 30 minutes of running should provide sufficient charge to
start the next time.

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL 15
Operation
Engine Operation for FM4DDE-MUL Electric Mulcher
Starting the Motor
• Plug the power cable into a 230V mains socket or extension cable that is no
longer than 10m and has a wire size of 2.5mm2. The extension cable must be no
thinner than the cable fitted to the mulcher. For the UK the motor plug is fitted
with a 13 amp machine fuse and the motor is protected by a 10 amp trip . EU
models are fitted with a 16 amp plug and a 13 amp trip. Do not use any type of
fuse other than a machine fuse.
• Press the green “ON” button.
• Run the motor for 1 - 2 minutes to ensure the mulcher is running freely before
use.
Stopping
Ensure no fragments remain inside the mulcher when turning it off. Allow to run for
1 min without feeding in any material before stopping the chipper. This will help to
avoid the risk of blockage for the next time you start the machine.
• Press the red “OFF” button.
• Disconnect the power cable from the mains socket.
Mulcher Operation
• Do not place any part of your body into the chute when loading. This is a very
unsafe method and could result in serious injury.
• Do not reach or step across the exit chute whilst the mulcher is running. This is
very unsafe and could result in serious injury.
• The mulcher works best with the discharge chute pointing downwards as it
reduces the chance of the mulched material blocking the discharge chute.
• Do not use the mulcher in wet conditions.
• If mulching wet material the discharge chute should point fully down.
• When loading garden waste, etc, place against the bottom side of the chute
and let the machine take the garden material into the blades. Do not push the
material into the blades as this could damage the machine.
• Do not over load the mulcher. Let previous material go through the blades before
adding more.
Stopping the Engine
Ensure no fragments remain inside the mulcher when turning it off. Allow to run for
1 min without feeding in any material before stopping the chipper. This will help to
avoid the risk of blockage for the next time you start the machine.
• Move the throttle lever to “IDLE”
• Turn the ignition switch to the “OFF” position.

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL
16
Removing A Blockage from the Mulcher
• Never attempt to unblock the machine whilst the mulcher is running.
• If the drum stops while mulching, stop the engine IMMEDIATELY and remove the
spark plug (FM6DD-MUL/FM6DDES-MUL) or disconnect the power cable (FM4DDE-
MUL).
• Unhinge either the feed hopper or discharge chute by removing the bolt and
washers on the bottom of chute and lifting it upward to allow access to the
drum. Remove items that are blocking the drum and then restart the machine.
• If the blockage cannot be removed by hand, then it is possible to rotate the drum
in reverse. On the drum side of the mulcher, remove the plastic cap by twisting
off anticlockwise and beneath there is a hexagonal section of the drum shaft that
can be turned (use a 17mm socket) to rotate the drum in reverse.
• If the blockage is cleared you should be able to rotate the drum by grasping the
hexagonal shaft with your thumb and forefinger.
• DO NOT rotate the drum by the smaller inner black bolt.
Operation
USE TO TURN
DO NOT TURN
• Always wear gloves, ear defenders, helmet and visor or safety glasses and
appropriate clothing when operating the mulcher.
• Do not feed the mulcher any foreign materials (stones, metal, plastic, string,
textile etc.)
• Do not use implements (i.e. fork or shovel) to feed the machine, especially not to
push the garden waste through.
• The mulcher can be used to chop paper, cardboard, cartons, etc. Ensure all
staples and tape are removed.

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL 17
Changing the Feed and Discharge Angles
To slow down or speed up the feed rate, or to alter the discharge angle, the drum
housing can be rotated to change the angle of the feed hopper and the discharge
chute. The drum housing can be rotated by a maximum of 40 degrees.
Note however that for CE regulation compliance, the exit of the discharge chute
should be no more than 30mm from the ground. The chipper is shipped with the
drum set at the correct position to comply with this.
Operation
Loosen the 3 nuts shown, just
sufficiently until the drum housing
is free to rotate. DO NOT remove the
nuts.
Rotate the drum housing to the
required angle then tighten the nuts.
The square shoulder of the coach
bolts must remain located in the slots
in the back plate.
Maximum Hopper Angle
CE Position Minimum Hopper Angle

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL
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Maintenance
Maintenance
Regular maintenance is the way to ensure the best performance and long life of your
machine. Please refer to this manual and the engine manufacturer’s user manual for
maintenance procedures.
Before performing any maintenance procedure or inspection, stop the engine, wait
five minutes to allow all parts to cool. Disconnect the spark plug wire (FM6DD-MUL/
FM6DDES-MUL) or the power cable (FM4DDE-MUL).
Regular Maintenance Checklist
Procedure Before Each
Use
Every 25
Hours
Every 100
Hours
Check Engine Oil Level X
Check General Equipment Condition X
Check Blades for Sharpness and Wear X
Clean Engine Exterior and Cooling X
Change Engine Oil X
Replace Air Filter X
Replace Spark Plug X
Engine Oil (FM6DD-MUL/FM6DDES-MUL)
Do not use the dipstick of the engine on the FM6DD-MUL/FM6DDES-MUL to check the
oil level. Due to the conditions under which the mulcher may be used, the dipstick
is not accurate enough, the engine must have 600ml of oil. To ensure the oil level is
sufficient, place the mulcher on level ground, remove the oil cap on the side of the
engine (next to the discharge chute) and make sure that the oil is full to the brim of
the cap. If not, add oil until it flows out of the hole, replace the cap and wipe off any
excess oil. Do not tip the mulcher up to fill with oil.
Engine/Motor Servicing
For the service of the petrol engine (FM6DD-MUL/FM6DDES-MUL) refer to the engine
manufacturer’s user manual. If you need help accessing the manual, contact Forest
Master.
Charging The Battery
The engine will trickle charge the FM6DD-MUL starter battery while it is running.
If however the battery has insufficient charge, use a trickle charger. Fully charged
battery should be more than 12.9 volts. Charging will be easier if the battery is
removed from the battery tray.

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL 19
Procedure Before Each
Use
Every 25
Hours
Every 100
Hours
Check Engine Oil Level X
Check General Equipment Condition X
Check Blades for Sharpness and Wear X
Clean Engine Exterior and Cooling X
Change Engine Oil X
Replace Air Filter X
Replace Spark Plug X
Maintenance
Replacing and Sharpening the Blades
To remove the blades for sharpening or replacement you will need an appropriate
16mm socket with NO LEADING TAPER, as the bolt heads are shallow. If a socket
with a leading taper is used, there is a possibility of rounding the bolt head as the
socket will slip.
Undo the bolt at the bottom of the feed hopper (51) and lift the hopper clear to
access the drum. Loosen the bolts (17) holding the blade to the drum and remove
the blade. There are two blade positions on the drum and both blades will need to be
maintained equally.
Note: The blades are reversible so they can be turned around to use the second side
before they need to be re-sharpened.
If the blades are re-sharpened, you will need to adjust the base block (26) at the
bottom of the drum to close the gap between the edge of the block and the knives.
The base block will need to be moved inwards so that there is a gap of around
0.25mm between the knives and the base block. Make sure the drum rotates freely
by moving it by hand using the nut on the outside of the drum.
When refitting the blades, you should use a small amount of mild thread lock to
secure each bolt.
Cleaning The Hopper
To clean the inside of the hopper of any material adhering to it, the CE plate and
the rubber curtain can be removed. Remove the 4 screws and washers holding the
CE plate and lift it out. Then remove the 2 screws holding the rubber flap, do not
remove the 3 screws joining the flap sections together.
CE PLATE RUBBER FLAP

Forest Master Model: FM6DD-MUL/FM6DDES-MUL/FM4DDE-MUL
20
Troubleshooting
Symptom Possible Cause
The engine won’t
start (Petrol)
• Is the ignition switch in the “ON” position?
• Is the fuel shut-off valve on?
• Are you using fresh, clean fuel? If the fuel is old, change
it. Use a fuel stabilizer if you keep fuel longer than 30
days.
• Is the spark plug clean? If the spark plug is dirty or
cracked, change it. If it’s oily, leave it out, hold a rag over
the plug hole and pull the recoil cord several times to
blow out any oil in the cylinder, then wipe off the plug
and reinsert it.
• Is there sufficient oil? Check the engine oil level and if
necessary top up to the correct level.
• Is there dirt in the carburettor? Undo the bolt holding the
float chamber to the carburettor, empty out any fuel and
clean the inside using fresh, clean petrol. Remove the jet
in the bottom of the carburettor and clean it. Refit the jet
and the float chamber.
• Is the pull start stuck or has more resistance? Check the
drum for blockages.
• Is the hopper securing bolt tight. If the lower bolt on the
hopper is not tightened then the safety cutout will be in
operation and the engine won’t start.
Pull cord is tight
/ starter motor
clicks, does not
turn
• drum blocked. Refer to removing blockage on Page 16.
The motor won’t
start (Electric)
(continued over
the page)
• If you press the start button on the mulcher and don’t
feel or hear a click of the button, then this typically
means that the mulcher isn’t receiving power.
• Is the plug connected to a power outlet?
Troubleshooting
Most problems are easy to fix. Consult the Troubleshooting Table below or the
frequently asked questions on our website https://forest-master.com/faq/ (which
is continuously updated) for common problems and their solutions. If you continue
to experience problems, or your problem is not listed, contact our technical line on:
0191 276 6553. For spare parts contact 01912655000.
Before performing any maintenance procedure or inspection, stop the engine, wait
5 minutes to allow all parts to cool. Disconnect the spark plug (FM6DD-MUL) or the
power cable (FM4DDE-MUL).