Ryobi RLM4852L User Manual [de]

RLM4852L

LAWN MOWER

OPERATOR’S MANUAL (Original Instructions)

Important!

It is essential that you read the instructions in this manual before
assembling, maintaining and operating this machine.

English (Original Instructions)

Your product has been engineered and manufactured to
Ryobi’s high standard for dependability, ease of operation,
and operator safety. When properly cared for, it will give
you years of rugged, trouble-free performance.

Thank you for buying a Ryobi product.

Save this manual for future reference

INTENDED USE

This product is intended for domestic lawn mowing. The
cutting blade should rotate approximately parallel to the
ground over which it is being wheeled. All four wheels
should touch the ground while mowing. It is a pedestrian
controlled walk behind mower.

NOTE: The mower should never be operated with the
wheels off the ground, it should not be pulled or ridden on.
It should not be used to cut anything other than domestic
grass lawns.

GENERAL SAFETY RULES

WARNING

To reduce the risk of injury, the user must read and
understand the operator's manual.

WARNING

Do not attempt to operate this mower until you have read
thoroughly and understood completely all instructions,
safety rules, etc. contained in this manual. Failure to
comply may result in accidents involving electric shock,
re, and/or serious personal injury.

WARNING

The machine should be operated with the battery pack.
When using battery operated machine basic safety
precaution should always be followed to reduce the risk
of re, leaking batteries and personal injury.

PERSONAL SAFETY

■ This lawn mower is capable of amputating hands and
feet, and throwing objects. Failure to observe all safety
instructions could result in serious injury or death.

■ Never allow children or people unfamiliar with the
instructions to use the machine. Local regulations may
restrict the age of the operator.

■ Stay alert, watch what you are doing, and use common
sense when operating the lawn mower. Do not operate
the mower while tired or under the influence of drugs,
alcohol, or medication. A lapse in concentration while
operating the machine may result in serious personal

injury.

■ Wear heavy, long trousers, long sleeves, boots,
and gloves. Do not wear loose fitting clothing, short
trousers, sandals, or go barefoot.

■ Always wear safety glasses with side shields. Use
face mask if operation is dusty.

■ Always be sure of your footing. Keep firm footing and
balance. Do not overreach. Overreaching can result in
loss of balance.

■ Walk, never run.

■ Mow across the face of slopes, never up and down.
Exercise extreme caution when changing direction on
slopes.

■ Do not mow near drop-offs, ditches, excessively steep
slopes, or embankments. Poor footing could cause a
slip and fall accident.

■ Plan your mowing pattern to avoid discharge of
material toward roads, public pavements, bystanders
and the like. Also, avoid discharging material against
a wall or obstruction, which may cause the material to
ricochet back toward the operator.

WORK AREA SAFETY

■ Never mow while people, especially children, or pets
are nearby.

■ Always mow in the daylight or in good artificial light.

■ Do not operate the machine in explosive atmospheres,
such as in the presence of flammable liquids, gases
or dust. The tool create sparks which may ignite the
dust or fumes.

■ Objects struck by the lawn mower blade can cause
severe injuries to persons. Thoroughly inspect the
area where the machine is to be used and remove all
rocks, sticks, metal, wire, bones, toys, or other foreign
objects.

■ Do not operate the machine in wet grass or in the rain.

■ Keep in mind that the operator or user is responsible
for accidents or hazards occurring to other people or
their property.

■ Tragic accidents can occur if the operator is not alert to
the presence of children. Children are often attracted
to the machine and the mowing activity. Never assume
that children will remain where you last saw them.

■ Keep children out of the mowing area and under the
watchful care of a responsible adult other than the
operator.

■ Be alert and turn mower off if a child enters the area.

■ Never allow children or people unfamiliar with the
instructions to use the machine.

■ Use extra care when approaching blind comers,
shrubs, trees, or other objects that may block your

2

English (Original Instructions)

view.

■ Keep work area clean.

■ Keep work area well lit.

■ Cluttered or dark areas invite accidents.

GARDEN TOOLS USE AND CARE

■ Before using, always visually inspect to ensure blades,
blade bolts, and cutter assembly are not worn or
damaged.

■ Replace worn or damaged blades and bolts in sets to
preserve balance.

■ Check all nuts, bolts, and screws at frequent intervals
for proper tightness to be sure the equipment is in safe
working condition.

■ Check the grassbox frequently for wear or
deterioration.

■ Replace worn or damaged parts.

■ Do not force the machine. It will do the job better and
safer at the speed for which it was designed.

■ Do not overload your mower. Mowing long thick grass
may cause the motor speed to drop, or the power to
cut out. When mowing in long thick grass a first cut
with the cutting height set higher will help reduce the
load. See adjusting the blade height.

■ Please note that cutting long grass will drain the
battery quicker than cutting shorter grass.

■ Stop the blade when crossing gravel surfaces.

■ Do not pull the mower backward unless absolutely
necessary. If you must back the machine away from a
wall or obstruction, first look down and behind to avoid
tripping or pulling the machine over your feet.

■ Stop the blade(s) if the machine has to be tilted for
transportation when crossing surfaces other than
grass, and when transporting the machine to and from
the area to be mowed.

■ Never operate the machine with defective guards
or shields, or without safety devices, for example,
deflectors and/or grassboxes, in place.

■ Switch on the motor according to instructions and
keep hands and feet away from cutting area. Keep
clear of the discharge opening at all times.

■ Never pick up or carry a lawnmower while the engine
is running.

■ Remove isolator key for the below cases:

● whenever you leave the machine

● before cleaning a blockage

● before checking, cleaning or working on the
machine

● after striking a foreign object; inspect the appliance
for damage and make repairs as necessary

● before clearing the grassbox

● if the machine starts to vibrate abnormally (check
immediately)

● when not in use and storing the machine

● when recharging and removing/inserting battery
pack

■ Avoid holes, ruts, bumps, rocks, property stakes, or
other hidden objects. Uneven terrain could cause a
slip and fall accident.

■ If the machine should start to vibrate abnormally,
stop the motor and check immediately for the cause.
Replace the blade if it is unevenly worn or damaged in
any way. Vibration is generally a warning of trouble.

■ If the machine strikes a foreign object, follow these
steps:

● Stop the machine by releasing the power lever,
wait until the blade comes to a complete stop, and
then remove isolator key.

● Thoroughly inspect the machine for any damage.

● Replace the blade if it is damaged in any way.
Repair any damage before restarting and
continuing to operate the mower.

● Use the right appliance. Do not use the machine
for any job except that for which it is intended.

■ When not in use, mower should be stored in a well­ventilated, dry, locked up place-out of the reach of
children. The isolator key should also be removed.

■ Follow manufacturer's instructions for proper operation
and installation of accessories. Only use accessories
approved by the manufacturer.

SERVICE

■ Service on the product must be performed by qualified
repair personnel only. Service or maintenance
performed by unqualified personnel could result in a
risk of injury to the user, or damage to the machine.

■ Use only identical replacement parts when servicing
the product. Use of unauthorised parts may create
a risk of serious injury to the user, or damage to the
product.

NOTE: Only perform the tasks listed in this manual. For
other service or repair, it should be done by a qualied
person.

BATTERY RULES FOR SAFETY

■ Battery operated units do not have to be plugged
into an electrical outlet; therefore, they are always in
operating condition. Be aware of possible hazards
even when unit is not operating.

■ Remove the battery pack before making any
adjustments, cleaning, or removing material from the
unit.

■ Ensure the isolator key is removed before inserting

3

English (Original Instructions)

battery pack.

■ A battery pack must be recharged only with the charger
specified by the manufacturer. Using a charger with
an incompatible battery pack may create a risk of fire.
Use battery pack only with charger listed.

■ Use only battery pack intended specifically for the
machine. Use of any other battery packs may result in
a risk of fire, electric shock, or injury to persons.

■ When battery pack is not in use, keep it away from
other metal objects like, paper clips, coins, keys, nails,
screws, or other small metal objects, that can make
a connection from one terminal to another. Shorting
the battery pack terminals together may cause sparks,
burns, or a fire.

■ Do not place battery products or their batteries near
fire or heat. This will reduce the risk of explosion and
possibly injury.

■ Do not open or mutilate the battery pack. Released
electrolyte is corrosive and may cause damage to the
eyes or skin. It may be toxic if swallowed.

■ Do not short-circuit the battery pack. There is danger
of explosion.

■ Protect the battery pack against moisture and water.
Do not charge unit in a damp or wet location. Following
this rule will reduce the risk of electric shock.

■ If electrolyte contacts the skin, wash it off immediately
with water.

■ If electrolyte contacts the eyes, flush thoroughly and
immediately with water. Seek medical attention.

■ In case of damage and improper use of the battery,
vapour may be emitted. Provide for fresh air and seek
medical help in case of complaints. The vapour can
irritate the respiratory system.

■ Do not leave the battery pack in the car in the summer.

■ Do not incinerate the battery.

SAFETY RULES FOR CHARGER

■ Use of an attachment not recommended by the
manufacturer may result in a risk of fire, electric shock,
or injury to persons. Following this rule will reduce the
risk of electric shock, fire, or serious personal injury.

■ Do not clean machine with isolator key or charger
installed.

■ Do not use the charger when the ambient temperature
is above 40ºC or below 0ºC.

■ Do not operate charger with a damaged cable or plug,
which could cause shorting and electric shock. Return
to authorised service centre for repair or replacement.

■ Do not operate charger if it has received a sharp blow,
been dropped, or otherwise damaged in any way.
Take it to an authorised service center for electrical

check to determine if the charger is in good working
order.

■ Do not disassemble charger, take it to an authorised
service station if repair is required. Incorrect
reassemble may result in a risk of electric shock or fire.

■ Unplug charger from outlet before attempting any
cleaning to reduce the risk of electric shock.

■ Disconnect charger from the power supply when not in
use to prevent damage to the charger during a power
surge.

■ Do not expose machine to rain or wet conditions.
Water entering charger will increase the risk of electric
shock.

■ Make sure cable is located so that it will not be stepped
on, tripped over, come in contact with sharp edges or
moving parts or otherwise subjected to damage or
stress. This will reduce the risk of accidental wash,
which could cause injury, and damage to the cable,
which could result in electric shock.

■ Keep cable and charger away from heat to prevent
damage to housing or internal parts.

■ Do not let gasoline/petrol, oils, petroleum-based
products, etc. come in contact with plastic parts.
They contain chemicals that can damage, weaken or
destroy plastic.

■ An extension cable should not be used for the
charger unless absolutely necessary. Use of improper
extension cable could result in a risk of fire and electric
shock. If extension cable must be used, make sure:

● That pins on plug of extension cable are the
same number, size and shape as those of plug on
charger.

● That extension cable is properly wired and in good
electrical condition.

WARNING

If any parts are missing, do not operate unit until the
missing parts are replaced. Failure to do so could result
in possible serious personal injury.

Save these instructions. Refer to them frequently and use
them to instruct others who may use this product. If you
lend someone this unit, lend them these instructions also.

4

English (Original Instructions)

SYMBOL

Some of the following symbols may be used on this product. Please study them and learn their meaning. Proper
interpretation of these symbols will allow you to operate the product better and safer.

V Volts

A Amperes

Hz Hertz

W

Hrs Hours

Watts

Precautions that involve your safety.

To reduce the risk of injury, user must read and understand user’s manual before using this
product.

Do not expose machine to rain or wet conditions.

Pay attention that bystanders are not injured through foreign objects thrown from the mower.

Keep all bystanders (especially children and pets) at least 15 m away from the work area.

Keep hands and feet away from blade and cutting area.

Switch off and remove isolator key before adjusting, cleaning and before leaving the product
unattended for any period.

Do not operate on inclines greater than 15˚. Mow across the face of slopes, never up and down.

Beware of electric shock hazard.

Wait for all components of machine to have completely stopped before touching them.

The charger is intended for indoor use only.

Tool in which protection against electric shock rely on double insulation or reinforced insulation.

5

English (Original Instructions)

The following signal words and meanings are intended to explain the levels of risk associated with this product.

Symbol Signal Meaning

DANGER

WARNING

CAUTION

CAUTION

This product has many features for making its use more
pleasant and enjoyable.

Safety, performance, and dependability have been given
top priority in the design of this product making it easy to
maintain and operate.

DESCRIPTION

1. Motor control cable

2. Start button

3. Power lever (grey)

4. Handle

5. Self propel lever (green)

6. Battery meter

7. Key cover/slot

8. Side discharge door opening

9. Battery pack

10. Isolator key

11. Side discharge deector

12. Height adjustment lever

13. Mulching plug

14. Grassbox

15. Charger

16. Upper handle

17. Lower handle

18. Hand knobs

19. Rear discharge door

20. Rear discharge opening

21. Pins

22. Side discharge door

23. Hooks of side discharge deector

24. Slots

25. Grassbox handle

26. Grassbox hooks

27. Rear door rod

28. Highest blade setting

29. Lowest blade setting

30. Charge receptacle 2

31. LED

Indicates an imminently hazardous situation, which, if not
avoided, will result in death or serious injury.

Indicates a potentially hazardous situation, which, if not
avoided, could result in death or serious injury.

Indicates a potentially hazardous situation, which, if not
avoided, may result in minor or moderate injury.

(Without safety alert symbol) Indicates a situation that may
result in property damage.

32. Charge receptacle 1

33. Motor shroud

34. Resettable fuse

35. Blade

36. Wrench

37. Wood

38. Blade posts

39. Shaft

40. Fan assembly

41. Blade insulator

42. Spacer

43. Blade nut

44. Nut

45. Rear wheels

46. Dust cover

47. E-ring

48. Washer

49. Pins

50. Wheel gear

51. Front wheels

52. Wheel axle

6

English (Original Instructions)

SPECIFICATIONS

Lawn mower RLM4852L

Width of cut 50.2 cm

Height of cut 19 mm - 76 mm

No-load speed 3000 rpm

Self-propelled speed 0.8~1.0 m/s

Grassbox capacity 55 L

Mower weight 43.1±2 kg

Serial number See product rating label

Battery Lead-acid

Battery number 31108469

Rated voltage 48 V

Charging time 8-10 Hours

Weight 14.6 ± 0.7 kg

Battery charger QL-91435A-4801300F

Input 220-240 V, 50-60 Hz, AC only

Output 48 V DC, 1.3 A

Allowable charging
temperature range

KNOW YOUR LAWN MOWER

See gure 1.

The safe use of the product requires an understanding of
the information on the tool and in this operator’s manual
as well as a knowledge of the project you are attempting.
Before use of this product, familiarize yourself with all
operating features and safety rules.

BATTERY METER

The battery meter measures the amount of charge
remaining in the battery.

GRASSBOX

The grassbox collects grass clippings and prevents them
from being discharged across your lawn as you mow.

HEIGHT ADJUSTMENT LEVER

The height adjustment lever provides cutting height
adjustments.

MOTOR CONTROL CABLE

The motor control cable, located on the upper handle of
the mower, engages and disengages the motor and blade.

0-40 ˚C

ISOLATOR KEY

The isolator key must be inserted before the mower can
be started.

MULCHING PLUG

Your mower is equipped with a mulching plug that covers
the rear discharge opening, which allows the mower blade
to cut and recut for ner clippings.

SELF-PROPELLED FEATURE

Pulling the self propel lever (green) upward to meet the
handle turns on the self-propelled feature of your mower.

SIDE DISCHARGE DEFLECTOR

Use the side discharge deector on your mower when
the grass is too high to mulch or when side discharging
is preferred. The grass clippings produced when using
the side discharge deector are noticeably larger than
those produced when using the mulching plug and side
mulching plate.

SIDE DISCHARGE DOOR

Your mower is equipped with a door that covers the side
discharge opening, which allows the mower blade to cut
and recut the grass for ner clippings if the mulching plug
is engaged, or otherwise sends the grass clippings to the
collection bag.

ASSEMBLY

UNPACKING

This product requires assembly.

■ Carefully remove the product and any accessories
from the box. Make sure that all items listed in the
packing list are included.

WARNING

Do not use this product if any parts on the packing list are
already assembled to your product when you unpack it.
Parts on this list are not assembled to the product by
the manufacturer and require customer installation. Use
of a product that may have been improperly assembled
could result in serious personal injury.

■ Inspect the product carefully to make sure no breakage
or damage occurred during shipping.

■ Do not discard the packing material until you have
carefully inspected and satisfactorily operated the
product.

■ If any parts are damaged or missing, please call your
Ryobi service centre for assistance.

7

English (Original Instructions)

PACKING LIST

■ Lawn mower

■ Isolator key

■ Grassbox

■ Charger

■ Mulching plug

■ Side discharge deflector

■ Operator’s manual

WARNING

If any parts are damaged or missing do not operate this
product until the parts are replaced. Using a product
with damaged or missing parts could result in serious
personal injury.

WARNING

Do not attempt to modify this product or create
accessories not recommended for use with this product.
Any such alteration or modication is misuse and could
result in a hazardous condition leading to possible
serious personal injury.

WARNING

Do not insert isolator key until assembly is complete and
you are ready to mow. Failure to comply could result in
accidental starting and possible serious personal injury.

WARNING

To prevent accidental starting that could cause serious
personal injury, always remove the battery pack from
the product when assembling parts.

WARNING

Never operate the mower without the proper safety
devices in place and working. Never operate the mower
with damaged safety devices. Operation of this product
with damaged or missing parts could result in serious
personal injury.

UNFOLDING AND ADJUSTING HANDLE

See gure 2.

■ Fully loosen the handle knobs on both sides of the
handle by rotating counterclockwise.

■ Pull up and back on the upper handle to raise the

handle into operating position. Make certain the
handles snap into place securely.

■ Tighten the handle knobs on both sides of the handle
to secure by rotating clockwise.

■ Avoid pinching or trapping any cables.

INSTALLING THE MULCHING PLUG (FOR MULCHING
OPERATION)

See gure 3.

NOTE: When using the mulching plug, do not install either
the side discharge deector or the grassbox.

■ Lift and hold up the rear discharge door.

■ Grasp the mulching plug by its handle and insert it at a
slight angle, as shown.

■ Push the mulching plug securely into place.

■ Ensure side discharge door is down.

■ Lower the rear discharge door.

INSTALLING SIDE DISCHARGE DEFLECTOR (FOR
SIDE DISCHARGE OPERATION)

See gure 4.

NOTE: When using the side discharge deector, do not
install the grassbox. The mulching plug should remain
installed.

■ Lift the side discharge door.

■ Align the hooks on the deflector with the hinge rod on
the underside of the door.

■ Lower the deflector until the hooks are secured on the
mulch door hinge rod.

■ Release the deflector and side discharge door.

INSTALLING THE GRASSBOX (FOR REAR BAGGING
OPERATION)

See gure 5.

NOTE: When using the grassbox, do not install either
the side discharge deector or the mulching plug. Also,
ensure side discharge door is closed securely.

■ Lift the rear discharge door.

■ Lift the grassbox by its handle and place under the
rear door, so that the hooks on the grassbox frame are
seated into the slots in the handle bracket.

■ Release the rear door. When installed correctly, the
hooks on the grassbox will rest securely in the slots on
the handle brackets.

SETTING BLADE HEIGHT

See gure 6.

When shipped, the wheels on the mower are set to a low­cutting position. Before using the mower for the rst time,
adjust the cutting position to the height best suited for your

8

English (Original Instructions)

lawn. The average lawn should be between 38 mm and 51
mm during cool months and between 51 mm and 70 mm
during hot months.

To adjust the blade height

■ Stop the mower, allow the blade to stop rotating and
remove the isolator key before making adjustment.

■ The mower can be set to 7 cutting heights between 19
mm and 73 mm.

■ Using the cut height between 19 and 36 mm will
shorten the battery duration.

■ To raise the blade height, grasp the height adjustment
lever and move it toward the back of the mower.

■ To lower the blade height, grasp the height adjustment
lever and move it toward the front of the mower.

OPERATION

WARNING

Do not allow familiarity with products to make you
careless. Remember that a careless fraction of a
second is sufcient to inict serious injury.

WARNING

Always wear eye protection. Failure to do so could
result in objects being thrown into your eyes resulting
in possible serious injury.

WARNING

Do not use any attachments or accessories not
recommended by the manufacturer of this product. The
use of attachments or accessories not recommended
can result in serious personal injury.

WARNING

Always inspect mower for missing or damaged parts
and blade for damage, uneven, or excessive wear prior
to use. Using a product with damaged or missing parts
could result in serious personal injury.

BATTERY METER

See gure 7.

Since the mower battery is shipped in a low charge
condition, the battery must be charged before use. The
battery has four LED lights to indicate battery capacity.
These lights will illuminate when the button is pressed.

If your LED lights illuminate, the battery is 100% charged
and ready for use. Three lights indicate a 50-80% charge.

Two lights indicate a 30-50% charge.

If one light illuminates, the battery will soon require
charging. It is recommended that the battery be charged
at this point. The battery is at 5-30% charge when one
light illuminates.

If no light illuminates, the battery must be charged
immediately before use. There is less than 5% of battery
charge remaining if none of the lights are on.

NOTE: When none of the lights are on, you must stop
the mower and charge the battery immediately, or it will
reduce the life of the battery.

CHARGING THE BATTERY PACK

See gure 7-8.

WARNING

Always remove the isolator key and store it in a separate
location out of the reach of children when the mower is
charging or not in use. Failure to remove the isolator
key may result in accidental starting or unauthorised
use and cause serious personal injury.

The lawn mower comes with a maintenance-free, spill­free, sealed 48 volt battery pack.

■ The battery charger is only for use indoors, it must not
be used in wet or damp environments. Do not operate
the charger near petrol/gasoline or other explosive
gasses or vapours.

■ The battery should be charged in a cool, dry place. The
battery charger should be operated in temperatures
between 0 ºC and 40 ºC.

■ Charge the battery pack only with the charger
provided.

■ The battery pack may be charged while it is connected
to the mower, or while it is disconnected from the
mower.

■ Allow at least 8-10 hours of charge time before initial
use of the mower.

■ For optimal performance, recharge the battery every
2 months even when it is not in use and prior to each
usage.

■ The charger may remain connected to the battery
pack any time the mower is not in use.

■ To improve battery life, store battery indoors in a
controlled climate.

■ The battery does not have to be fully discharged
before recharging.

■ Two to three initial charging/discharging cycles may
be required to achieve maximum run time/capacity.

■ When fully charged, the battery can be safely stored in

9

English (Original Instructions)

environment of 25 ˚C for a period of up to two months,
before it requires charging.

To charge:

■ Make sure the power supply is normal household
voltage, 220-240 V, 50-60 Hz, AC only.

■ Remove the isolator key and store in separate location
out of reach of children.

■ Method 1: Remove the isolator key, then plug the
charger connector into the slot on the right vent when
the battery is on the mower. See figure 8.

■ Method 2: After parting the battery from the mower,
plug the charger connector into the receptacle on the
battery. See figure 7-18.

■ Insert the plug of the charger into the wall receptacle.

■ The red light on the charger should come on, indicating
you have power and the battery is being charged. The
red light should go off when charging is complete. A
fully discharged mower will charge in approximately
8-10 hours.

■ When charging is complete, disconnect the charger
from the battery, or the slot from the right vent.

STARTING/STOPPING THE MOWER

See gure 9-10.

■ Insert the isolator key into the slot on the motor/shroud
assembly.

■ Press and hold the start button. Pull the power lever
toward the handle and release the button to start the
mower.

■ To stop the mower, release the power lever.

■ For starting in thick grass conditions maybe necessary
to press down on the handlebars and slightly raise the
front wheels until the motor reaches full speed.

■ Never lift the rear wheels as this can cause debris to
be thrown towards you and increase risk of injury.

SELF-PROPELLED MOWING

See gure 9-10.

■ Once the mower has been started, the self-propelled
feature is engaged by pulling the self propel lever
upward to meet the handle.

■ To disengage the self-propelled feature, release the
self propel lever.

MOWING TIPS

See gure 11.

■ Make sure the lawn is clear of stones, sticks, wires,
and other objects that could damage the lawn mower
blades or motor. Do not mow over property stakes or
other metal posts. Such objects could be accidentally
thrown by the mower in any direction and cause

serious personal injury to the operator and others.

■ For a healthy lawn, always cut off one-third or less of
the total length of the grass.

■ Do not cut wet grass, it will stick to the underside of
the deck and prevent proper bagging or mulching of
grass clippings.

■ New or thick grass may require a higher cutting height.

■ Clean the underside of the mower deck after each use
to remove grass clippings, leaves, dirt, and any other
accumulated debris.

NOTE: Always stop mower, allow blades to completely
stop, and remove the isolator key before cleaning
underneath the mower.

SLOPE OPERATION

WARNING

Slopes are a major factor related to slip and fall
accidents that can result in severe injury. Operation on
slopes requires extra caution. If you feel uneasy on a
slope, do not mow it. For your safety, do not attempt to
mow slopes greater than 15 degrees.

■ Mow across the face of slopes, never up and down.
Exercise extreme caution when changing direction on
slopes.

■ Watch for holes, ruts, rocks, hidden objects, or bumps
which can cause you to slip or trip. Tall grass can hide
obstacles. Remove all objects such as rocks, tree
limbs, etc., which could be tripped over or thrown by
the blade.

■ Always be sure of your footing. A slip and fall can
cause serious personal injury. If you feel you are losing
your balance, release the power lever immediately.

■ Do not mow near drop-offs, ditches, or embankments;
you could lose your footing or balance.

EMPTYING THE GRASSBOX

See gure 12.

■ Stop mower, allow blades to completely stop, and
remove isolator key.

■ Lift the rear door.

■ Lift the grassbox by its handle to remove from mower.

■ Empty grass clippings.

■ Lift the rear door and reinstall the grassbox as
described earlier in this manual.

10

English (Original Instructions)

MAINTENANCE

WARNING

Before performing any maintenance, make sure the
mower battery and isolator key are removed to avoid
accidental starting and possible serious personal injury.

WARNING

When servicing, use only authorised replacement parts.
Use of any other parts may create a hazard or cause
product damage.

WARNING

Keep the motor and battery compartments free from
grass, leaves or excessive grease. This will help reduce
the risk of re.

GENERAL MAINTENANCE

Before each use, inspect the entire product for damaged,
missing, or loose parts such as screws, nuts, bolts, caps,
etc.

Tighten securely all fasteners and caps and do not
operate this product until all missing or damaged parts
are replaced. Please call Ryobi customer service for
assistance. Avoid using solvents when cleaning plastic
parts. Most plastics are susceptible to damage from
various types of commercial solvents and may be
damaged by their use. Use clean cloths to remove dirt,
dust, oil, grease, etc.

WARNING

Do not at any time let brake uids, gasoline, petroleum­based products, penetrating oils, etc., come in contact
with plastic parts. Chemicals can damage, weaken, or
destroy plastic which may result in serious personal
injury.

Periodically check all nuts and bolts for proper tightness to
ensure safe operation of the mower.

Wipe the mower clean with a dry cloth occasionally. Do
not use water.

LUBRICATION

All of the bearings in this product are lubricated with a
sufcient amount of high grade lubricant for the life of
the unit under normal operating conditions. Therefore, no
further bearing lubrication is required.

WARNING

Always protect hands by wearing heavy gloves and/or
wrapping the cutting edges of the blade with rags and
other material when performing blade maintenance.
Contact with the blade could result in serious personal
injury.

WARNING

Do not lubricate any of the wheel components.
Lubrication may cause the wheel components to fail
during use, which could result in serious personal injury
to the operator and/or mower or property damage.

RESETTING THE FUSE

See gure 13.

If the motor stops while you are cutting grass, you may
need to reset the fuse. Press the reset button on the fuse
and try restarting the motor.

REPLACING THE CUTTING BLADE

See gure 14-15.

NOTE: Only use authorised replacement blades. Replace
worn or damaged blades and bolts in sets to preserve
balance.

■ Stop the motor and remove the isolator key. Allow
blade to come to a complete stop.

■ Remove the battery pack.

■ Turn the mower on its side.

■ Wedge a block of wood (not provided) between the
blade and mower deck to prevent the blade from
turning.

■ Loosen the blade nut by turning it counterclockwise
(as viewed from bottom of mower) using a 15 mm
wrench or socket (not provided).

■ Remove the blade nut, spacer, blade insulator, and
blade.

■ Make certain the fan assembly is pushed completely
against the motor shaft.

■ Place the new blade on the shaft. Ensure blade
is properly seated with shaft going through center
blade hole and the two blade posts inserted into their
respective holes on the blade. Make sure it is installed
with the curved ends pointing up toward the mower
deck and not down toward the ground. When seated
properly, the blade should be flat against the fan
assembly.

■ Replace the blade insulator and spacer, then thread
the blade nut on the shaft and finger tighten.

NOTE: Make certain all parts are replaced in the exact

11

English (Original Instructions)

order in which they were removed.

■ Torque the blade nut down clockwise using a torque
wrench (not provided) to ensure the bolt is properly
tightened. The recommended torque for the blade nut
is 62.5~71.5 kgfcm (350-400 in.-lb.).

■ To reduce the fire hazard, keep the motor and battery
compartment free of grass, leaves, or excessive
grease.

DRIVE GEAR MAINTENANCE

See gure 16.

To ensure smooth operation of wheels, the wheel
assembly should be cleaned before storage.

■ Remove the nut by turning counter clockwise. Remove
wheel and set aside.

■ Remove dust cover, e-ring, washer, pins, and wheel
gear. Clean any dirt from these items and the end of
the drive shaft by wiping with a dry cloth. If necessary,
rubbing alcohol may be used to remove any stubborn
dirt.

■ Reinstall wheel gear with the arrows facing the front of
the mower. Reinstall pins, washer, e-rings, and dust
cover.

■ Reinstall wheel and nut. Tighten nut clockwise to
secure.

REPLACING FRONT WHEELS

See gure 17.

■ Using a hex wrench (not provided), remove the hex
nut by turning counterclockwise.

■ Remove the wheel and replace with new wheel.

■ Replace the hex nut and tighten securely by turning
clockwise.

STORING THE MOWER

See gure 2.

■ Remove the isolator key and store in separate location
out of reach of children.

■ Removal of the battery is not required for storage.

■ When the battery pack is not in use, store it in an
environment of 25 ˚C and recharge it every 2 months.

■ Before storage, wipe any dirt or debris from the battery
area.

■ Turn mower on its side and clean grass clippings that
have accumulated on the underside of the mower
deck.

■ Wipe the mower clean with a dry cloth occasionally.
Do not use water.

■ Check all nuts, bolts, knobs, screws, fasteners, etc.,
for tightness.

■ Inspect moving parts for damage, breakage, and
wear. Have repairs made on any damaged or missing
parts. Check blade for damage, uneven, or excessive
wear and replace blade if these conditions exist.

■ Store mower indoors in a clean, dry place out of the
reach of children.

■ Do not store near corrosive materials such as fertilizer
or rock salt.

To lower the handle before storing:

■ Fully loosen the handle knobs on the sides of the
handle and fold the upper handle down.

■ Push inward on each side of the lower handle, and
lift the sides of the lower handle past the edges of the
handle mounting brackets. Avoid pinching or trapping
any cables.

REPLACING THE BATTERY

See gure 18.

The mower battery is designed for maximum life; however,
like all batteries, it will eventually need to be replaced.

Charge the new battery pack before use. See charging
the battery pack in the operation section of this manual.

To install a new battery:

■ Remove the isolator key.

■ Carefully lift the old battery by the handle.

■ Install the new battery pack.

■ Take the old battery pack to a recycling center that
accepts lead acid/lithium ion batteries. Never dispose
of battery in fire or regular household trash.

ENVIRONMENTAL PROTECTION

Waste electrical products should not be
disposed of with household waste. Please
recycle where facilities exist. Check with
your local authority or retailer for recycling
advice.

Do not dispose of battery packs/batteries

into household waste, re or water. Battery
packs/batteries should be collected, recycled or disposed
of in an environmental-friendly manner.

Consult your local waste authority for information
regarding available recycling and/or disposal options.

12

English (Original Instructions)

TROUBLESHOOTING

Problem Possible cause Solution

Carriage bolts are not seated

Handle is not in position.

Mower is not starting.

Mower is cutting grass unevenly.

Mower is not mulching properly.

Mower is hard to push.

Mower is not bagging properly. Cutting height is set too low. Raise the cutting height.

properly.

Cam handle is not tightened. Tighten cam handle.

Battery is low in charge. Charge the battery.

Battery is either inoperable or will not
take a charge.

Lawn is rough or uneven or cutting
height not set properly.

Wet grass clippings are sticking to
the underside of the deck.

High grass, rear of mower housing
and blade are dragging in heavy
grass, or cutting height too low.

Adjust the height of the handle and
make sure the carriage bolts are
seated properly.

Replace the battery.

Move the wheels to a higher position.
All wheels must be placed in the
same cutting height for the mower to
cut evenly.

Wait until the grass dries before
mowing.

Raise the cutting height.

Blade is unbalanced, excessively or
unevenly worn.

Mower is vibrating at higher speed.

Motor shaft is bent.

Mower does not self-propel.

Cutting height is set too low. Raise the cutting height.

Motor stops while cutting.

If these solutions do not solve the problem contact your authorised service dealer.

Battery has no power. Charge the battery.

Resettable fuse protected. Press the reset button on the fuse.

13

Replace the blade.

Stop the motor, remove isolator key
and battery, disconnect the power
source, and inspect for damage.
Have it repaired by an authorised
service center before restarting.

Take the mower to an authorised
service center.

LIMITED WARRANTY

TTI warrants this outdoor product to be free of defects in material or workmanship for 24 months from the date of purchase
by the original purchaser, subject to the limitations below. Please keep your invoice as proof of date of purchase.

This warranty is only applicable where the product is used for personal and non-commercial purposes. This
warranty does not cover damage or liability caused by / due to misuse, abuse, accidental or intentional acts by user,
improper handling, unreasonable use, negligence, failure by end user to follow operating procedures outlined in the
user’s manual, attempted repair by non-qualied professional, unauthorised repair, modication, or use of accessories
and/or attachments not specically recommended by authorised party.

This warranty does not cover belts, brushes, bags, bulbs or any part which ordinary wear and tear results in required
replacement during warranty period. Unless specically provided under applicable law, this warranty does not cover
transportation cost or consumable items such as fuses.

This limited warranty is void if the product’s original identication (trade mark, serial number, etc.) markings have been
defaced, altered or removed or if product is not purchased from an authorised reseller or if product is sold AS IS and /
or WITH ALL FAULTS.

Subject to all applicable local regulations, the provisions of this limited warranty are in lieu of any other written warranty,
whether express or implied, written or oral, including any warranty of MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. IN NO EVENT SHALL WE BE LIABLE FOR SPECIAL, INCIDENTAL, CONSEQUENTIAL
OR INCIDENTAL DAMAGES. OUR MAXIMUM LIABILITY SHALL NOT EXCEED THE ACTUAL PURCHASE PRICE
PAID BY YOU FOR THE PRODUCT.

This warranty is valid only in the European Union, Australia and New Zealand. Outside these areas, please
contact your authorised Ryobi dealer to determine if another warranty applies.

EC DECLARATION OF CONFORMITY

Name: AC (Macao Commercial Offshore) Limited
Address: Unit D, 26/F, Centro Commercial da Praia Grande, No.429 Avenida da Praia Grande, Macau
Name and address of the person authorised to compile the technical file:
Name: Simon Del-Nevo (Director of Outdoor Power Equipment)
Address: Techtronic Industries Europe, Middle East and Africa, Medina House, Fieldhouse Lane, Marlow, Bucks, SL7 1TB,
United Kingdom

Herewith we declare that the product

Category ................................................................................................. LAWN MOWER

Model ............................................................................................................... RLM4852L

Serial number.............................................................................. See product rating label

Year of Construction .................................................................... See product rating label

• is in conformity with the relevant provisions of the Machinery Directive (2006/42/EC)

• is in conformity with the provisions of the following other EC-Directives
EMC Directive (2004/108/EC),
Noise Emission Directive (2000/14/EC amended by 2005/88/EC)

And furthermore, we declare that

• the following (parts/clauses of) European harmonised standards have been used
EN60335-1, EN836, EN62233, EN55014-1, EN55014-2.

Notified body, TUV Rheinland (Shanghai) Co., Ltd has carried out EC type approval, and the certificate no. is 50193445 0001

Sound pressure level LpA 82.6 dB, K = 3
Guaranteed sound power level LwA 97 dB, K = 3
Maximum vibration <2.5 m/s2, K = 1.5
Conformity assessment method to Annex V Directive 2000/14/EC

Place, date: Hong Kong, 15/12/2010 Signature: Andrew John Eyre (BEng, CEng, MIET)
Vice President of Engineering

TECHTRONIC INDUSTRIES EMEA

Medina House, Fieldhouse Lane,
Marlow, Bucks
SL7 1TB - United Kingdom

RYOBI TECHNOLOGIES (UK) LIMITED

Medina House, Fieldhouse Lane,
Marlow, Bucks
SL7 1TB - United Kingdom
Tel: + 44 (0) 1628 894400
Fax: + 44 (0) 1628 894401
Technical Helpline : + 44 (0) 800 389 0305

TECHTRONIC INDUSTRIES FRANCE SAS

Immeuble Le Grand Roissy
Z.A. du Gué - 35 rue de Guivry
77990 Le Mesnil Amelot France
Phone: + 33(0)1 60 94 69 70
Fax: + 33(0)1 60 94 69 79

RYOBI BELGIUM

Avenue des Pâquerettes, 55
Zoning artisanal - bâtiment 5
B - 1410 Waterloo
Belgique
Tel : + 32(0) 2357 8140
Fax : + 32(0) 2357 8149

TTI ITALIA SRL

Via Fratelli Gracchi, 39
20092 Cinisello Balsamo (MI)
Italia
Tel : + 39 02 37050440
Fax : + 39 02 37050444

TECHTRONIC INDUSTRIES IBERIA S.L

Av. De la Industria, 52
Coslada – Madrid – España
Tel: [phone]

TECHTRONIC INDUSTRIES SOUTH AFRICA
CO. (PTY) LTD

P.O Box 83888, South Hills,
Johannesburg, 2136
South Africa

TECHTRONIC OUTDOOR PRODUCTS
TECHNOLOGY LIMITED

24/F, CDW Building,
388 Castle Peak Road,
Tsuen Wan, Hong Kong
Tel : + 852 2402 6888

TECHTRONIC INDUSTRIES CENTRAL EUROPE GMBH

Itterpark 2
D-40724 Hilden
Deutschland
Tel: + 49 (0) 2103 960-0
Fax: + 49 (0) 2103 960-238

TECHTRONIC INDUSTRIES
AUSTRALIA PTY LIMITED

Building B, Rosehill Industrial Estate,
3 Shirley Street,
Rosehill NSW 2142
Australia
Tel: [phone] or 1300 361 505
Fax: [phone]

TECHTRONIC INDUSTRIES (NZ) LIMITED

27 Clemow Drive, Mt Wellington
PO Box 12-806, Penrose, Auckland
New Zealand
Tel: + 64 (0) 9 573 0230
Free Call: [phone]
Fax: + 64 (0) 9 573 0231

A&M MIDDLE EAST FZCO

P.O.Box 61254
Jedel Ali, Dubai
United Arab Emirates
Tel.: + 9714 8861399
Fax: + 9714 8861400

TECHTRONIC INDUSTRIES DENMARK APS

Stamholmen 147, 4
DK-2650 Hvidovre
Denmark
Tlf 43 56 55 55
Fax [phone]
E-mail: [e-mail]

TECHTRONIC INDUSTRIES NORWAY AS

Stamholmen 147, 4
DK-2650 Hvidovre
Denmark
Tlf.: ([phone]
Faks: ([phone]
E-mail: [e-mail]

TECHTRONIC INDUSTRIES SWEDEN AB

Stamholmen 147, 4
DK-2650 Hvidovre
Denmark
Tel [phone]
Fax [phone]
E-mail: [e-mail]

TECHTRONIC INDUSTRIES FINLAND OY

Stamholmen 147, 4
DK-2650 Hvidovre
Denmark
Tel. [phone]
Fax [phone]
E-mail: [e-mail]