Black Decker Lawn Mower GRC730 User Manual

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B2 B3  
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Instruction Manual  
This manual provides operating and maintenance  
instructions for the Black & Decker GRC730  
cordless lawnmower.  
Before using your machine, remove  
safety key and visually check that the  
blade, blade nut and cutter assembly are  
not worn or damaged. Damaged blades  
and worn blade nuts must be replaced.  
Also check that the blade nut is securely  
Know your machine  
Read this manual carefully. Observe all the  
recommended safety instructions before,  
during and after using your machine, and  
maintain your machine in good working order.  
Always check that your lawn or cutting  
path is clear of all sticks, stones, wire  
and other debris. Contact with such  
debris may damage your machine.  
Familiarise yourself with the controls on your  
machine before attempting to operate it, but  
above all, be sure you know how to stop  
your machine in an emergency.  
When tilting the handle downwards for  
starting, do not tilt it more than is  
absolutely necessary. Always ensure that  
both hands are in the operating position  
and feet are well away from the blades  
before returning the mower to the ground.  
Retain this manual and all other literature  
supplied with your machine for future  
Avoid accidental starting. Ensure switch  
is off when inserting safety key.  
Safety instructions  
Release switch lever to turn mower off  
and remove the safety key:  
Never allow children or persons who are  
unfamiliar with this type of machine to  
use it, nor anyone who has not read  
this leaflet.  
Whenever you leave your machine  
Before checking, cleaning or working  
on the mower.  
Do not allow children, animals  
or other persons near your  
6m / 20ft  
machine when in use - always  
keep them at least 6m (20ft)  
away from the cutting area.  
Before clearing a blockage.  
If the mower starts to vibrate  
abnormally (check immediately).  
Remember that the operator/user is  
responsible for accidents or hazards  
occurring to other people or their property.  
After striking a foreign object.  
Inspect the mower for damage and  
make repairs as necessary.  
Never run the unit whilst on its’ side or  
attempt to stop the blade - always allow  
it to stop on its own.  
To protect your feet, always wear stout  
shoes or boots - freshly cut grass is  
damp and slippery.  
Do not put hands or feet near or under  
rotating parts.  
Use protective equipment. Wear safety  
spectacles or goggles whilst mowing.  
Use a face mask if dusty.  
Keep clear of discharge openings at all  
Do not operate in gaseous explosive  
Start your machine carefully according to  
the instructions and with your feet well  
away from the blades.  
Do not mow barefoot or in open sandals.  
Wear long trousers to protect your legs -  
any debris left on the lawn or cutting path  
may be picked up and ejected by the  
Avoid using the machine during rain and  
avoid wet grass if possible.  
Mow only in daylight or good artificial light.  
Do not pull your machine towards you or  
walk backwards when mowing.  
Always be sure your machine is in a safe  
operating condition.  
Do not cross gravel paths or roads whilst  
the blade is rotating.  
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Always be sure of your footing,  
particularly on slopes.  
Always mow across the face of slopes,  
never up and down. Exercise extreme  
caution when changing direction on slopes.  
Do not cut excessively steep slopes and  
always wear non-slip footwear.  
Rechargeable 12V battery - provides  
reliable power that will cut approx. 300m2.  
Check the grassbag frequently for wear  
or damage, and replace if necessary.  
Easy to start - starts first time every time.  
Specially designed switch box (16) and  
safety key (24) to prevent accidental  
starting of the mower.  
Walk, never run. Do not force the mower.  
Never pick up or carry your mower while  
the motor is running. Ensure the blades  
have stopped rotating when tilting for  
transporting the mower to and from the  
area to be mowed.  
Ergonomically designed upswept handle  
for comfortable use and ease of  
pushing (10).  
A blade brake (autostop) for added  
safety - stops the blade from rotating  
within 3 seconds once the switchbox  
lever is released.  
When transporting your unit, always  
remove the safety key, adjust the cut  
height setting to a mid position and take  
extreme care when lifting.  
Large handle wing nuts for easy  
assembly and storage.  
Never operate the mower with defective  
guards or shields.  
Single lever height of cut adjustment for  
quick and easy operation (20).  
Maintenance and storage  
Store your machine in a dry place when  
not in use, remove the safety key and  
place out of the reach of children.  
Five height of cut positions which  
provides the flexibility to deal with most  
grass conditions.  
Do not use solvents or cleaning fluids to  
clean your machine - use a blunt scraper  
to remove grass and dirt. Always remove  
the safety key before cleaning.  
The in line wheels allowing cutting right  
up to the edge of the lawn.  
Large capacity grass bag (30 litres) for  
longer cutting periods (19).  
Do not charge or store the unit outdoors.  
Easy grassbag removal.  
Do not operate your machine if any parts  
are defective; discard all defective parts  
and fit new parts before use.  
Smooth bottom deck design giving you a  
better cut performance and an improved  
quality of cut.  
Replace worn or damaged parts for safety.  
Tough, durable plastic deck which will  
not rust and contributes to low noise and  
low vibration.  
Keep all nuts, bolts and screws tight to  
be sure your mower is in a safe working  
Rear roller (UK only) which produces the  
traditional, striped effect on the lowest  
height of cut.  
Use only Black & Decker recommended  
replacement parts and accessories.  
Powerful and efficient 12V permanent  
magnet motor which gives effective  
cutting and bagging in all reasonable  
conditions and a low noise level.  
Features (Fig. A)  
Your purchase of the Black & Decker  
GRC730 lawnmower gives you a product  
combining quality with modern design and  
the following features, to provide safe,  
efficient and easy mowing.  
The GRC730 will have a run time under  
average cutting conditions of  
approximately 300m2. This run time will  
vary upwards and downwards  
Cordless - there is no need for extension  
cables while mowing.  
dependant upon grass conditions, cut  
height used and push speed.  
Gasless - there is no need for petrol and  
oil to buy, mix, store or transport.  
Black & Decker policy is one of continuous  
improvement to their product and as such  
they reserve the right to change product  
specification without prior notice.  
Clean - there are no emissions, the  
mower is environmentally friendly.  
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When both handles are assembled, fit  
one cable clip (18) onto the upper handle  
and one onto the lower handle. Clip the  
cable into these ensuring the grassbox  
can be removed and positioned freely.  
B3 •  
Unpacking and assembly  
Your mower carton contains:  
The mower and handle assembly.  
One hardware bag containing:  
Two safety keys (24).  
Instruction literature.  
Blade nut spanner (25).  
Grassbag assembly (Fig. C)  
Note: Ensure the battery is disconnected.  
Charger (26).  
Read the safety instructions at the beginning  
of this manual before using this accessory.  
Battery strap (27).  
Before starting to assemble the grassbag,  
check that the parts are similar to those  
shown in Fig. C1.  
C1 •  
One grassbag assembly (19) - see below for  
assembly instructions.  
Secure the grassbag by inserting the bag  
rim into the channel and pushing down  
firmly until the clip feature locks onto the  
bag rim (inset).  
Handle assembly (Fig. A & B)  
Remove the contents of the carton and  
familiarise yourself with the individual parts of  
the mower.  
Push the support frame firmly into place.  
C2 •  
C3 •  
The main parts of the mower shown in Fig. A  
are as follows:  
Assemble the two side clips to the  
support frame, then assemble the  
bottom clip.  
Machine body (1):  
Cutter deck (2)  
Motor cover (3)  
Battery cover (4)  
Grass flap (5)  
Wheel assembly (6)  
Pivot pin (7)  
Battery information  
The battery in your cordless lawnmower is a  
12 volt sealed lead acid system. The battery  
employs an absorbed electrolyte and, can  
therefore, be stored in any position without  
fear of leakage.  
Grill (8)  
The battery has been charged at the factory,  
however, it will be necessary to recharge the  
battery to ensure full charge before initial use.  
Handle (9):  
Upper handle (10)  
Lower handle (11)  
Handle knob (12)  
Switch lever (15)  
Switch box (16)  
For optimal performance the battery should  
be recharged after each use.  
For winter storage ensure:  
The mower is fully charged before storing.  
Electric cable (17)  
Retaining clips (18)  
The temperature of the storage location is  
below 25˚C.  
Storage duration is less than 6 months.  
The lower handle (11) comes ready  
assembled to the mower body.  
Always store your mower in a dry and  
cool location.  
B1 •  
All that is required is to unfold the handle  
by lifting it until the handle ends snap into  
their locations on the sides of the mower.  
Once this is complete the knobs (12) can  
be tightened.  
Keep the mower and battery away from water,  
heat sources (such as radiators, heaters, stoves  
etc.), flames or chemicals.  
Battery strap  
B2 •  
The upper handle (10) is assembled by  
fitting the bolts (13) through the holes in  
the lower handle, aligning the upper  
handle over these and securing with a  
washer (14) and then the knob (12).  
Locate the battery and its carrying strap.  
Fold the sides of the strap up and put the battery  
in place.  
Click the straps together ensuring you locate  
every hole.  
Tighten each one with hand pressure only.  
Do not use a spanner.  
The strap should be kept on the battery at all times.  
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Charging instructions  
Always charge your mower indoors in a  
well ventilated area, where it is dry and  
protected from the weather.  
Charge mower in a location where the  
temperature is more than 5˚C (41 F) and  
below 40˚C (104˚F).  
Recharge mower to a fulI charge immediately  
after use.  
Warning! Do not attempt to charge  
non-rechargeable batteries.  
In order to get maximum performance from your  
mower with maximum battery life, it is important that  
you recharge the battery immediately after each use.  
Battery failure will occur if the mower is stored  
without having a full charge.  
To charge  
The battery on your mower can be  
charged on the mower or can be  
removed and charged away from the  
mower if a mains socket is not at hand.  
Recharge mower to a fulI charge for winter storage.  
To charge the battery ON the mower  
When preparing your mower for winter storage, it is  
important that it is recharged. Battery failure will occur  
if the mower is stored without having a full charge.  
Remove the safety key (24) and store in a  
safe place away from children.  
Open the battery cover (4) by pressing in  
the lock symbols at each side of the  
cover and hinge upwards.  
Battery disposal  
When the mower’s battery requires replacing  
discharge the energy from the battery by  
running the mower until the motor stops.  
Remove the battery from the mower .  
Disconnect the battery lead (red and  
black) by pulling it from the socket at the  
side of the battery recess.  
The red and black socket of the charger  
is then connected to the red and black  
socket of the battery.  
Warning: The battery may still have some  
residual charge even after the motor stops.  
It is therefore necessary to protect against  
accidental short circuit of the battery  
terminals with uninsulated tools or materials  
of a conductive nature, such as, but not  
limited to steel wool or aluminium foil.  
Note: The charger socket will fit one way only.  
Connect the charger to the mains socket  
and switch on.  
The red indicator on the charger will turn  
on. This indicates that the battery is  
being charged.  
Batteries must be disposed of in a  
responsible manner.  
When the battery becomes charged,  
normal time 24 to 30 hours, the red light  
will go out and the green light will turn on.  
This symbol indicates the lead acid battery  
contained within this unit must be disposed  
of properly and not discarded in everyday  
household waste which may be disposed of  
in an incinerator or landfill site.  
It is safe to leave your battery on charge  
until ready to use.  
Lead acid batteries can be harmful to the  
environment and can explode when exposed  
to fire. Do not incinerate.  
Disconnect the charger from the battery  
and connect the battery to the socket on  
the mower.  
The battery should be taken to a  
Black & Decker service centre, your local  
dealer or your local recycling station. If  
necessary, contact your local authority for  
disposal information.  
Your mower is now ready for use.  
To charge the battery OFF the mower  
Remove the safety key and open battery  
cover as described above and  
disconnect the battery.  
If the cutting performance begins to deteriorate,  
please refer to the “Fault finding” guide.  
Lift out battery out of the mower using  
the carry handle.  
Warning! Do not cross battery leads when  
installing a new battery as this will cause the  
blade to run in reverse until battery is  
discharged. When you attempt to recharge  
the battery, the charger circuit will be  
destroyed as soon as you connect the  
charger plug.  
Charge as described above.  
After charging, replace in mower and  
connect to the mower socket.  
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If, when grasscutting, loose grass is seen to be  
scattered from beneath the mower, the grass-  
bag is probably full and should be emptied.  
How to use your machine  
(Fig. D & E)  
Important! Always observe all the relevant  
warnings when using your machine.  
Fitting the grassbag to the unit  
Hold the grassbag top (19) by its handle.  
Warning! Never attempt to operate your  
machine with one hand. You must guide  
your machine with both hands.  
Lift the grassflap (5), then guide the  
grassbag through the lower handle tube  
and fix to the rear of the unit by lining up  
the arrows marked on the cutter deck  
and grassbag top.  
Safety key  
In order to prevent accidental start-up or  
unauthorised use of your cordless  
mower, a removable safety key has been  
incorporated into the design of your  
mower. The mower will be completely  
disabled when this safety key has been  
removed from the mower.  
Finally, when this is complete, gently  
release the grassflap (5) and it will return  
to sit onto the location area of the  
grassbag top (19).  
Removing the grassbag  
The full grassbag may be removed by raising the  
grassflap (5) and then lifting the grassbag up and  
through the lower handle.  
Note: The safety key has a hole in the centre  
to allow for storage on a hook, out of the  
reach of children.  
Warning! Always remove the safety key from  
mower when leaving it unattended, even for  
a short period of time.  
Height of cut adjustment (Fig. F)  
Warning! Remove safety key before making  
Your safety key will be found in the  
parts pack (plus one spare).  
any adjustments and give the blade time to  
stop rotating; cutting blades are sharp.  
By moving the height of cut adjuster (20)  
at the rear of your machine outwards  
from the mower body and then up or  
down as required, the height of cut can  
be varied to give 5 positions.  
Remove tie wrap from switch lever prior  
to first use.  
Insert the safety key into position and  
push fully home.  
Note: The 5 position height of cut adjuster  
is under tension when in the engaged  
position. It has to be sprung outwards to  
move it from one height setting to another  
and will spring back automatically into  
position when released.  
Tilt the handle downwards to slightly  
raise the front of the mower to reduce  
the risk of lawn damage whilst starting.  
Your mower is equipped with a special  
on/off switch lever. The switch lever is  
recessed within the switch housing to  
prevent turning the mower on accidentally.  
D1 •  
Settings 1, 2 and 3 are suitable for  
course or overgrown grass. Settings 4  
and 5 should be used for maintaining  
cultivated lawns. Setting 5 should only be  
used if a very short cut is desired.  
To operate the switch, insert your finger  
into the opening and push the lever out  
so that you can pull it with your other hand.  
Pull the lever back against the mower  
handle and hold in this position to keep  
the mower running.  
D2 •  
UK only  
To produce a stripe effect on your lawn,  
simply adjust the height of cut to its  
lowest position, setting 5, which will bring  
the roller into contact with the grass. The  
roller may be removed for cleaning by  
levering out one end to release the axle  
from its clip.  
To turn the mower off, just release the  
lever. The spring-loaded “snap-action”  
lever will relocate itself back into its  
original position inside the switch housing.  
When you have finished using your machine  
we recommend that you clean all debris from  
it before putting it away. It is important to  
remove the safety key before cleaning. Please  
refer to the “Care and maintenance” section.  
Maintenance of blades  
The steel blade is designed to give a fine  
Note: To obtain the best results cut your  
lawn or grassed area regularly and do not  
cut when the grass is wet.  
finish in long or tough grass.  
If, however, because of damage or wear the  
cutting performance deteriorates, then the  
mower may require a new blade, or at least  
the existing blade to be sharpened.  
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We recommend that the steel blade is  
sharpened or a new blade fitted at the  
beginning of the season.  
Replacement blades A6157 are available from  
Black & Decker dealers and service centres.  
Warning! When fitting a new blade use only  
the Black & Decker replacement part  
specified for your machine - do not attempt  
to fit any other blade.  
Overload protection  
Your machine is fitted with overload protection.  
If you work too quickly in long grass, or in heavy  
cutting conditions, you may overload the motor.  
This will be indicated by a significant drop in speed,  
and eventually, the overload protection will operate.  
This is not a fault but a safety device to protect  
your machine.  
Fitting new blade (Fig. G)  
Observe all the relevant warnings before  
changing the blade.  
Warning! Remove safety key before  
changing the blade.  
When this occurs, remove the safety key and wait for  
1 to 2 minutes to allow to cool, clear any blockage  
ensuring the blade is free to rotate. To restart,  
replace the safety key and operate the switch lever.  
Turn your machine over on its side so  
that the underside of the cutter deck is  
If the cut-out operates again within 10 minutes, you  
should increase the height of cut (see “Height of  
cut adjustment”).  
Wear gloves to protect hands.  
Severe overloading may result in a longer delay on  
restarting. In such cases, after resetting, you should  
allow the motor to cool.  
Using a cloth placed over the blade or  
heavy duty gloves to protect your hands,  
grip the blade and, using the spanner  
provided, loosen and remove the nut  
from the motor spindle. Turn the nut in an  
anti-clockwise direction to loosen it.  
To obtain the best results:  
Cut the grass regularly.  
Do not cut wet grass.  
When the grass is longer than 10cm (4 inches),  
it is advisable to go over the lawn on a high cut  
setting and then finish using a lower setting.  
Remove nut (23), square washer (22),  
clutch plate (21) and blade.  
To replace blade ensure the cutting  
edges of the blade are closest to the  
ground and place blade onto the  
combined mount.  
Care and maintenance  
The advice given in this section covers the general  
care and maintenance of the main body of your  
mower. Advice relating to the blades is given in  
“Maintenance of blades”. Advice relating to the  
maintenance and storage of the battery is given in  
“Battery information”.  
Place the clutch plate over the shoulder  
of the combined mount protruding  
through the blade. Ensure to align the  
inside edges with the outside edges of  
the blade.  
Place the square steel blade spacer on  
the motor shaft aligning the inside flats  
with the shaft and engaging the outside  
edges with the plastic clutch plate.  
Engage nut on shaft and turn it  
clockwise to tighten.  
Always keep your machine clean and free from  
grass cuttings, especially the underside of the  
cutter deck and the air vents.  
At the end of each cutting session we  
recommend that the build up of grass on the  
underside of the cutter cover is removed using a  
blunt scraper, the spanner included with this  
mower may be used for this purpose.  
Ensure that removed parts are replaced  
correctly before use, incorrect assembly  
may result in damage to your mower  
and reduced cutting performance.  
Clean all plastic components with a damp cloth.  
Caution! Do not use solvents or cleaning fluids  
as these may damage the plastic components of  
your mower.  
Note: This unit is fitted with a clutch plate  
(24), between the blade nut and the blade,  
which must be assembled correctly at all  
times. Damaged blade assembly parts must  
be replaced before use.  
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The product has been used within the  
parameters of its consumer classification.  
Fault finding  
If your mower does not operate correctly, use the  
following table to locate the problem.  
The product has not been used for hire purposes.  
Repairs have not been attempted by anyone other  
than authorised repairer agents.  
Mower does not run  
when switch lever  
is activated  
(a) Check to make sure safety key  
has been inserted correctly.  
(b) Remove the safety key, turn  
mower over and check that the  
blade is free to turn.  
The failure represents normal wear and tear.  
This guarantee is offered as an extra benefit and is  
additional to your statutory rights.  
(c) Has battery been fully  
charged? Plug in charger and  
wait for green light to come on.  
What to do if your Black & Decker  
product needs repair  
If your Black & Decker product should need repair  
the quickest and simplest way is to take or send it  
back to a Black & Decker authorised repair agent,  
providing proof of purchase if a guarantee repair  
is required.  
Mower stops when mowing  
(a) Remove safety key. Turn  
mower over and check that blade  
is free to turn.  
(b) Raise cutting height of wheels  
and start mower.  
(c) Has battery been fully  
charged. Plug in charger and wait  
for green light to come on.  
(d) Check that safety key has not  
fused. Replace if necessary.  
If you have any difiiculty, please contact our sevice  
and information centre (tel: 0345 230230) who will  
give you every assistance.  
Our guarantee policy  
Failures due to the following are not covered:  
Mower runs but cutting  
performance is  
(a) Has battery been fully  
charged? Plug in charger and  
wait for green light to come on.  
(b) Battery may need replacing.  
Refer to ‘Battery disposal’ section.  
Replacing worn or damaged blades, nylon line  
and chains, or cables damaged during storage  
or use. These are regarded as replacement items  
which wear during normal usage.  
Mower is too hard to push  
(a) Raise cutting height to  
reduce drag on grass. Check  
each wheel for ease of rotation.  
Failures as a result of sudden impact or obvious  
Failures due to usage not in accordance with  
instructions and recommendations contained in  
the instruction manual.  
Mower is abnormally noisy  
and vibrates  
(a) Remove safety key. Turn unit  
on its side and check blade for  
damage. If damaged replace with  
Black & Decker replacement blade.  
(b) If there is no visible damage  
to the blade or underside of the  
mower return to your local service  
centre or authorised dealer.  
The use of other than genuine Black & Decker  
accessories and parts may damage or reduce the  
performance of you Black & Decker product and  
may render the guarantee void.  
Black & Decker after sales service  
Warning! Always remove safety key before  
If you need any help or advice please contact your  
local Black & Decker authorised repair agent. A full  
directory is printed on the reverse of the parts  
drawing included with your mower.  
carrying out any inspection.  
Black & Decker lawn and garden  
This guarantee provides 36 months parts cover  
and 12 months labour. Proof of purchase will be  
Other Black & Decker products  
Black & Decker has a full range of outdoor power  
tools that make life easy in the garden. If you would  
like further information on the following products,  
please contact Black & Decker service information  
centre at the address on the back cover, or contact  
your Black & Decker stockist.  
If your Black & Decker product becomes defective ,  
within the guarantee period, due to faulty materials  
and workmanship, we guarantee to either replace all  
defective parts, or at our discretion, replace the unit  
free of charge, provided that:  
Grass trimmers  
Compost shredder  
The product is returned to us or our authorised  
repairers with evidence of purchase.  
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EC Declaration of Conformity  
We declare that unit: GRC730  
conforms to 89/392/EEC, EN55104,  
89/336/EEC, 73/23/EEC, EN60335, EN55014  
A weighted sound pressure @ 4m 80dB (A)  
A weighted sound power 91dB (A)  
Hand/arm weighted vibration <2.5m/s2  
Brian Cooke  
Director of Engineering  
Spennymoor, County Durham DL16 6JG, United Kingdom  
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Black & Decker (Aasia) Pty Ltd  
286-288 Maroondah Highway  
North Croydon, Victoria 3136  
Tel: 03 9213 8200  
Fax: 03 9726 7150  
New Zealand  
South Africa  
Black & Decker  
483 Great South Road, Penrose, Auckland  
Tel: 09 579 7600  
Fax: 09 579 8200  
Powerdek Tool Distributors  
22 Inglestone Road, Village Deep  
Johannesburg, South Africa  
Tel: 011 493 4000  
Fax: 011 493 6391  
United Kingdom  
Black & Decker  
210 Bath Road  
Tel: 0345 230230  
Tel: 01753 511234  
Tlx: 848317 BAND MH  
Fax: 01753 551155  
Berkshire SL1 3YD  
Part no: 372324-01 3/97.3  
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Part no: 372324-01 3/97.3  
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