RHINO 148cc B&S450 Instruction manual

148cc B&S450 engine
400mm(16") cutting width
434mm(17") deck size
Environmental protection
Description of symbols
Safety rules for petrol lawn mowers
Operation safety instructions
Contents of carton
Know your product
Cutting height adjustment
Checking the oil
Starting, running and stopping the engine
Mowing advice
Engine starting check list
Changing the mower blade
Oil change
Fill the mower engine with adequate
recommended oil before starting.
Flammable material.
Use at a distance of at least 15m from
other people.
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 a short time after the unit is turned off.
Thrown objects and rotating blades
can cause severe injury.
CAUTION. Before carrying out any operation stop
the engine and disconnect the spark plug cap.
CAUTION. Risk of hand and feet injuries.
Description of symbols
Conforms to relevant standards
for electromagnetic compatibility
The rating plate on your equipment may show symbols.
These represent important information about the
product or instructions on its use.
Wear hearing protection.
Wear eye protection.
Wear breathing protection.
Wear safety gloves.
Wear safety footwear.
Read these instructions for use carefully.
Safety rules for petrol lawn mowers
Engine Capacity:
148cc B&S450
Fuel Type:
Unleaded petrol
Oil Type:
4 Stroke Motor Oil 10-30W
Width of cut:
16” /400mm
Single bar blade
Height adjustment:
8 Levels, 10 – 70mm
Wheel Size:
Weight (GW):
• Read the instructions carefully. Get familiar with the
controls and proper use of the equipment.
• Only use the lawn mower for the purpose for which it was
designed, i.e. for cutting and collecting grass. Any other
use can be hazardous, causing damage to the machine.
• Never allow children or people unfamiliar with these
instructions to use the lawn mower. Local regulations may
restrict the age of the operator.
• Never use the lawn mower:
– When people, especially children, or pets are nearby.
– If the operator has taken medicine or substances that
can affect his ability to react and concentrate.
• Remember that the operator or user is responsible
for accidents or hazards occurring to other people
or their property.
• While mowing, always wear sturdy footwear and long
trousers. Do not operate the equipment when barefoot
or wearing open sandals.
• Thoroughly inspect the area where the equipment is to be
used and remove all objects which may be thrown by the
machine or damage the cutter assembly and the engine
(stones, sticks, metal wire, bones, etc.)
• WARNING: DANGER! Engine fuel is highly flammable:
– Store fuel in containers specifically designed for this purpose.
– Refuel using a funnel and outdoors only. Do not smoke
while refuelling or whenever handling the fuel.
– Add fuel before starting the engine. Never remove
the cap of the fuel tank or add fuel while the engine is
running or when the engine is hot.
– If fuel is spilled, do not attempt to start the engine but
move the machine away from the area of spillage and
avoid creating any source of ignition until the fuel has
evaporated and the vapour dispersed.
• Start the engine carefully, following the instructions and
keeping feet well away from the blade.
• Do not tilt the lawn mower when starting the engine.
Start the engine on a flat surface that is free of obstacles
and tall grass.
• Do not put hands or feet near or under rotating parts.
Keep clear of the discharge opening at all times.
• Never pick up or carry a lawn mower while the engine
is running.
• Stop the engine and disconnect the spark plug wire:
– Before carrying out any work underneath the cutting deck
or before unclogging the chute;
– Before checking, cleaning or working on lawn mower;
– After striking a foreign object. Inspect the lawn mower for
damage and make repairs before restarting and operating
the lawn mower;
– If the lawn mower starts to vibrate abnormally (find and
remove the cause of the vibration immediately).
• Stop the engine:
– Whenever you leave the lawn mower unattended.
Remove the key from models with electric starters.
– Before refuelling.
– Every time you remove or replace the grass-catcher.
• Reduce the throttle before turning off the engine and turn
the fuel off when you have finished mowing, following the
instructions in the engine handbook.
• When mowing, always keep to a safe distance from the
rotating blade. This distance is the length of the handle.
• Never cut grass while walking backwards.
• Stop the engine before pushing mower across gravel
drives, walks or roads.
• This machine is to be used exclusively for cutting natural
grass. Never use the mower for other purposes. Any
other utilization can involve danger for your safety and
can involve damage to the mower.
– Replace all fuel tanks and containers caps securely.
• Substitute faulty silencers.
• Before use, always inspect the machine, especially the
condition of the blades, and check that the screws and
cutting assembly are not worn or damaged. Replace worn or
damaged blades and screws in sets to preserve balance.
• Discharge openings must be guarded at all times. Do not
remove the discharge guard or hold it up while mowing.
• It is advisable to wear suitable eye protection when
operating the mower.
• Check and fill engine with recommended oil before
• Do not operate the engine in a confined space where
dangerous carbon monoxide fumes can collect.
• Mow only in daylight or good artificial light.
• If possible, avoid operating the equipment in wet grass.
• Always be sure of your footing on slopes.
• Walk, never run and do not allow yourself to be pulled
along by the lawn mower.
• Mow across the face of slopes, never up and down.
• Exercise extreme caution when changing direction on slopes.
• Do not mow on slopes of more than 20°.
• Exercise extreme caution when pulling the lawn-mower
towards you.
• Stop the blade if the lawn mower has to be tilted for
transportation when crossing surfaces other than grass,
and when transporting the lawn mower to and from the
area to be mowed.
• Never operate the lawn mower with defective guards,
or without safety devices, such as the stoneguard and/or
grass-catcher, in place. Replace if damaged.
• Do not change the engine governor settings or over
speed the engine.
• On power-driven models, disengage the drive clutch
before starting the engine.
• The user is responsible for the safety of other people,
animals and objects in the working area. Keep children
and domestic animals at a safe distance while the mower
is in use.
Maintenance and storage
• Keep all nuts, bolts and screws tight to be sure the
equipment is in safe working condition. Regular
maintenance is essential for safety and performance.
• Never store the equipment with fuel in the tank inside a
building where vapour may reach a flame or a spark or a
source of extreme heat.
• Allow the engine to cool before storing in an
enclosed space.
• To reduce the fire hazard, keep the engine, exhaust
silencer, battery compartment and fuel storage area
free of grass, leaves, or excessive grease. Do not leave
containers with grass cuttings in rooms.
• Check the stone-guard and grass-catcher frequently for
wear and deterioration and replace if damaged.
• If the fuel tank has to be drained, this should be done
outdoors and when the engine is cool.
• Wear strong work gloves when removing and
reassembling the blade.
• Check the blade’s balance after sharpening.
• For reasons of safety, do not use the equipment with
worn or damaged parts. Parts are to be replaced and
not repaired. Parts that are not of the same quality can
damage the equipment and be dangerous for your safety.
• Whenever the machine is to be handled, transported or
tilted you must:
– wear strong working gloves;
– grasp the machine at the points that offer a safe grip,
taking account of the weight and its distribution.
• Damaged blades and worn bolts are major hazards.
• Fuel goes off in about 3 - 4 months. If you find your
mower does not start, try changing the fuel in the
tank with newly purchased fuel.
Operation safety instructions
WARNING: Stop the engine and unplug the spark plug
before any repairs or maintenance operations.
• Check that all nuts, bolts and screws are well tightened
before every use.
• Before mowing ensure that the blade and the blade fixing
screw are securely fastened. When the blade edges
require re-sharpening, this must be done evenly on both
sides to prevent any imbalance. If the blade is damaged,
it must be replaced.
• When mowing always wear long trousers and strong,
covered footwear.
• Do not run the engine in an enclosed and/or poorly
ventilated area. The gas of the engine contains carbon
monoxide, which is dangerous to your health.
• Work only when there is sufficient light.
• Do not use the lawn mower when it is raining or when
the grass is wet.
• Caution must be taken while mowing on slopes. Mow
across the face of slopes, never down or up.
• Turn off the engine if you must leave the lawn
mower unattended.
• Never lift the rear of the mower while starting the
engine and never place your hands and feet underneath
the deck while the engine is running.
• If working on high grass, adjust the mowing height to
reduce the friction and prevent over loading. The optimal
mowing height should be 1/3 the height of the grass.
It would affect the work efficiency of lawn mower if too
higher or lower.
• Never change the rated speed of the engine in any way .
• Never lift or carry the mower while the engine is running.
• Stop the engine and remove the spark plug cover in
these cases:
- Before any operation under the deck.
- Before any maintenance, repairing or checking operations.
- Before carrying, lifting or removing the mower.
- If you leave the mower unattended or change the
cutting height.
- After hitting a foreign object, stop the engine and check
thoroughly the mower in order to see if it is damaged.
Take the mower to an authorized service centre to carry
out any repairs if necessary.
- If the mower vibrates in an abnormal way, take the
mower to an authorized service centre.
- Check the bolts and nuts regularly. Bolts and nuts may
vibrate loose over time.
WARNING: Fuel is highly flammable.
• Keep fuel in a jerry can specially made for this purpose.
• Fill the fuel tank with a funnel and outside. Do not smoke
or use a mobile phone during this process.
• Fill with fuel and oil before starting the engine. Never
open the cap of the fuel tank to add gasoline while the
engine is running or still hot.
• Do not start the engine if there is spilt fuel on the mower
or in the area surrounding. Take the mower away from
the zone where fuel has been split and avoid any
contact from a hot source as long as the split gasoline is
completely evaporated.
• Tighten the fuel tank cap and jerry can cap tightly.
Due to modern mass production techniques, it is unlikely
that your lawn mower is faulty or that a part is missing.
If you find anything wrong, do not operate the equipment
until the parts have been replaced or the fault has been
rectified. Failure to do so could result in serious personal
Contents of carton
• Handle bar locking knobs, (including 2 bolts)
• 40L Soft catcher
Know your product
1. Handle bar
2. Lower handle
3. Throttle lever
4. Wheel
5. Catcher
6. Height adjustment lever
7. Fuel tank cap
8. Oil filler cap
9. Recoil starter
10. Spark plug cap
11. Handle bar locking knob
12. Discharge guard
13. Blade
14. Blade bolt
Attaching the handles
It is necessary to attach both the lower handle
and handle bars.
1. To attach the lower handle
(2), first use a spanner (not
supplied) to remove the
4 bolts.
2. Place the lower handle in
position and replace the
4 bolts. Use a spanner to
retighten the nuts.
3. To attach the handle bar (1), first remove the two handle
bar locking knobs (12).
4. Position the handle bar over the lower handle and insert
the two locking knobs. Tighten to secure the handles
together and in place.
WARNING: Stop the engine and unplug the spark plug
before any repairs or maintenance operations.
It is necessary to fit the lower handle (2), handle bar (1),
and catcher (5) to the mower.
Attaching the catcher
1. Lift the discharge guard (15) in
order to position the catcher.
2. While lifting the discharge
guard, align the holes in the
lower half of the catcher with
the hooks on the mower deck
(located under the discharge
chute). Push the catcher onto
the hooks in a downwards direction.
3. Push the catcher down until it locks into place.
4. Release the discharge guard to secure the catcher in
place between the 2 ribbed locking notches.
Note. Always empty the catcher before it has reached
maximum capacity, otherwise it will decrease the
performance of the mower.
Tip. Do not leave clippings in the catcher for extended
5. Retighten the oil filler cap firmly before starting
the engine.
Cutting height adjustment
WARNING: Stop the engine and unplug the spark plug
before any repairs or maintenance operations.
The mower has
one lever to easily adjust the
cutting height.
There are 7 height settings.
1. To decrease the cutting height
pull the height adjustment
lever (6) out and move it up a
notch, towards the handlebar.
2. To increase the cutting height pull the lever out and move
it down a notch, towards the engine.
Note. If you are unsure of which cutting height to use, begin
with a high setting and trial a small section of lawn, then
check the appearance of the lawn. Then readjust if necessary
IMPORTANT. If mower is not used for an extended period
of time (3 months or more) fuel and oil must be decanted
(emptied) then replaced before the next use.
IMPORTANT. Fuel goes off after about 3-4 months. If you
find your mower does not start, first change the fuel in the
tank with newly purchased fuel.
Note. Use fresh unleaded petrol.
1. Unscrew the fuel tank cap
(7) and pour unleaded petrol
into the tank with the aid of a
2. Fill the tank to approximately
2.5 cm below the lowest
portion of the neck to allow for
fuel expansion.
Be careful not to over fill.
3. Be careful not to spill any petrol, if this happens, wipe
the spill with a clean rag.
4. Start the engine at least three meters away from the
area where the fuel tank has been filled in order to avoid
the risk of fire.
WARNING. Never attempt to refuel the engine while it is
running or still warm, allow it to cool before fuelling.
Checking the oil
1. Move the lawn mower to a level surface and clean
around the oil filler cap (8) .
2. Remove the oil filler cap with dipstick and wipe it with a
clean cloth. Replace it and retighten the cap.
3. Remove the dipstick again and check the oil level, the
oil should be at the full (‘max’) mark.
4. If oil is required add it slowly (the oil capacity is about
0.6 litre), do not over fill.
Starting the engine
Note. Before
starting the mower
check the oil and
fuel levels.
1. Move the
throttle lever (3)
to the start
2. Push the primer
bulb firmly 5 times (for initial
starting) or 3 times (for engine
starting thereafter).
Mowing advice
1. It is recommended to use the fast throttle setting and
keep the engine running at maximum speed. This will
deliver the best cut and extend engine life. If the speed of
the engine slows this could indicate the mower is being
overloaded, by trying to cut too much grass or the catcher
may be full. Try mowing a narrower strip, mowing slower,
raising the cutting height or emptying the catcher.
2. Before mowing always check and clear the grassed area
for all foreign objects, especially solid ones semi concealed
in the ground such as rocks, stumps and garden stakes.
3. Sharp blades cut cleanly and efficiently, if the blade is
dull it will tear the grass. This will result in the ends
turning brown. When the blades no longer cut cleanly
either sharpen them or replace them.
4. To safely operate the mower ensure all four wheels are
on the ground and be careful not to loose your footing
or control of the mower. Be very careful when mowing
uneven or rough ground. Keep a firm grip on the handle
bar at all times, always walk, never run with the mower.
5. For healthy growth, grass should not be cut too short.
The grass will remain healthier, greener and require less
6. Vary your cutting pattern from week to week, this will
help to prevent matting and graining of the grass.
7. Before checking a clogged mower deck stop the engine
completely and disconnect the spark plug lead and then
tilt the mower so the air filter side is facing upwards.
Use a stick the clear any clogged material, never use
your hands.
3. Pull the recoil starter (9) lightly until you feel resistance
then pull quickly until the engine starts. Do not pull the
cord with a jerk or release it until fully rewound.
4. Once the lawn mower has started and warmed up move
the throttle lever to the Run position.
Stopping the engine
To stop the engine reduce the speed of the engine by
pulling the throttle lever (3) towards the tortoise.
8. Mowing wet grass should be avoided. Wet grass will
clog the mower deck and if it is slippery you may lose
your footing.
9. Always mow across slopes not up and down them.
Be extra careful if the grass is wet as this could cause
you to slip and lose control of the mower.
10. If the ground is too dry, mowing will stir up a lot of
dust which may clog the air filter. In these conditions
it is recommended to water your lawn the day before
11. Use the side of the mower as a guide to cut close to
large objects such as a fence or a wall. Be careful when
mowing over obstacles embedded in the lawn such as
sprinkler systems and paving, avoid anything that sticks
up above the surface of the lawn.
12. Avoid mowing over loose stones, gravel and other
landscaping material as this can be picked up by the
mower and flung out causing serious personal injury.
13. If the blades do come into contact with something or
the mower starts to vibrate stop the engine immediately,
remove the spark plug lead and inspect the blades to
see if there is any damage.
Remove the spark plug and check that the end is not
blackened by carbon build up. Clean with a soft wire brush
if necessary.
Test the spark plug ignition by disconnecting the spark plug
wire from the spark plug. Hold the end of the spark plug
wire close to a metal surface. If the spark plug is good, you
will see a spark or you’ll hear a crackling noise. This means
that voltage is getting through the wire to the spark plug.
Note: This should only be carried out by a confident end
user as if not careful, this procedure may result in a non
lethal electric shock. Petrol fumes and people with pace
makers need to be taken into consideration when checking
the spark this way.
Air filter
Check that the air filter is clean and dry. Filters thick with
debris will not allow the engine to breath and result in
difficult starting and poor engine performance
Engine tipping
When cleaning, or performing any maintenance such as
replacing the blades, it is very important that the mower
is only tipped backwards. Failing to do so will result in the
engine oil flowing into the cylinder and muffler making
starting very difficult if at all. Should this occur, the mower
should be taken to a mower repair shop which is not
covered under warranty.
Poor engine performance
Should the engine idle or run rough at full speed with
excessive bluey/black smoke emanating from the muffler,
it is possible that either the engine was slightly tipped
incorrectly (refer above) or the carburettor is set to rich. With
the engine running, adjust the mixture screw back slightly
until performance improves. This screw is located through a
slot in the front of the air filter cover.
Engine starting check list
Check the oil level
The correct level is achieved by
first ensuring mower is on a level
surface. Then with the dip stick
screwed in oil the way in and
then back out again, check the
level is to the “Max” indicator line.
Make sure it is not over-filled.
Fuel check
As fuel can go off relatively quickly, make sure you are
using fresh unleaded fuel and don’t overfill the tank.
Spark plug
Check the spark plug cable is firmly fitted to the top of the
spark plug.
1. Periodically check the blade (14) for nicks and dull cutting
edges and have it sharpened if needed.
WARNING. When cleaning, or performing any maintenance
such as replacing the blades, it is very important that
the mower is only tipped backwards. Failing to do so will
result in the engine oil flowing into the cylinder and muffler
making starting very difficult if at all. Should this occur, the
mower should be taken to a mower repair shop which is not
covered under warranty
Note. The blade should be sharpened and balanced by an
authorised repair centre.
2. If there are rounded or broken
ends, thinned metal or other
damage, replace the blade.
3. With the engine switched
off, lift the front of the mower
upwards so the handle bar sits
on the ground and the spark
plug faces upwards.
Note. Improper tipping may
affect engine performance.
4. Put on a pair of sturdy gloves
to protect your hands.
5. Block the rotation of the blade
(14) and use a spanner (not
supplied) to unscrew the blade
bolt (15) in an anti-clockwise
direction (viewed from
6. Replace the blade (14) and screw in the blade bolt (15),
tightening it with a spanner (not supplied).
Note. When reassembling the blade, ensure the cutting
edges face in the direction of the engine rotation.
7. Return the mower to the upright position.
8. Start the engine and allow the mower to run for a few
minutes to check that the blade is properly fitted and that
there is no undue noise or vibration. Use only the blade
as recommended by the manufacturer
CAUTION. Before making any adjustment or maintenance
procedures to the mower ensure it is turned off and the
spark plug lead is removed.
To remove the catcher, raise the guard while lifting the
catcher to dislodge it from the hooks.
WARNING. Check the catcher frequently for cracks and
wear and replace it if damaged.
Changing the mower blade
1.Stop the engine and unplug the spark plug before any
repairs or maintenance operations.
2.Do not over tilt the mower when changing or checking
the blade.
3.Never carry out any assembly operations or adjustments
with the engine running.
The blade is made of pressed steel. In order to obtain a
clean cut, sharpen the blade periodically after every
25 hours of use. Ensure that the blade is always well
balance. A badly balanced blade can involve harmful
vibrations and may cause injury.
Oil change
IMPORTANT. Drain the oil while the engine in still warm to
ensure rapid and complete draining.
1. Remove the oil cap dipstick (8) and drain plug underneath
the engine to drain the oil.
2. Turn up right and clean up any spillage and refill with fresh
oil checking the level as you go.
3. Reinstall the oil fill cap dipstick.
Note. Please dispose of used motor oil in a manner that
is compatible with the environment. We suggest you take
it in a sealed container to your local service station for
reclamation. Do not throw it in the trash or pour it into
the earth.
• When you finish working, clean the engine completely,
making sure there is no grass or dirt on the engine.
• Store the engine away from direct sunlight.
• At the end of the season, give the engine an overall
cleaning and a thorough check.
• Whenever the machine is not used for a long period of
time, proceed as follows:
• Empty the fuel tank completely.
• Protect all metal engine parts from corrosion by coating
them with oil.
• Remove the spark plug, put a few drops of oil into the
cylinder and then pull the recoil starter 2 to 3 times in
order to distribute the oil evenly. Replace the spark plug.
This closes the valves, and protects them from dust and
corrosion. Coat areas that may rust with a light film of oil.
Cover the engine and store it on a level surface in a dry,
dust free area.
CAUTION. If the engine must be tipped to transport
equipment or to inspect or remove grass, keep the spark
plug upwards.
Transporting or tipping the engine spark plug down
may cause:
• Smoking
• Hard starting
• Spark plug fouling
• Oil saturation of the air filter
Ensure the storage area is free from excessive humidity
and dust.
Drain the fuel tank and carburettor.
WARNING. Fuel is extremely flammable and explosive
under certain conditions. Do not smoke or allow flames or
sparks in the area.
Note. Be aware to not hit or cut the fuel tank while you
are transporting.