Lawn Tractor 8211 0276 03 Stiga Park Pro20 Pro16 Royal President Senator Operators Manual

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START AND OPERATING
ENGINE CASING
To inspect and maintain the engine and battery, re-
move the engine casing. Dismantling:
1. Unscrew the fuel cap/fuel gauge.
2. Pull up the rubber strap at the front edge of the
casing (fig. 10).
3. Carefully lift off the engine casing (fig. 11).
Assembly:
1. Place the casing over the lip on each side.
2. Make sure that the pins on the rear edge of the
casing go down into the respective holes (fig.
12).
3. Secure the front edge of the casing with the rub-
ber strap (fig. 10).
4. Finally, screw in the fuel cap/fuel gauge.
The machine may not be operated un-
less the engine casing is mounted. Risk
of burns and crushing injuries.
FILLING THE FUEL TANK
Always use lead-free petrol. You must never use 2-
stroke petrol mixed with oil.
Note! Bear in mind that petrol is a perishable; do
not purchase more petrol than can be used within
thirty days.
Environmentally friendly petrol can also be used.
This type of petrol has a composition that is less
hazardous for people and nature.
Petrol is highly inflammable. Always
store petrol in containers that are made
especially for this purpose.
Only fill or top up with petrol outdoors,
and never smoke when filling or top-
ping up. Fill with petrol before starting
theengine.Neverremovethefuelcap
or fill with petrol while the engine is
running or still warm.
Never completely fill the fuel tank. Leave an emp-
ty space (= at least the entire filler tube plus 1 - 2
cm at the top of the tank) to allow the petrol to ex-
pand when it warms up without overflowing
(fig. 28).
CHECKING THE ENGINE OIL LEVEL
On delivery, the crankcase is filled with SAE 30
oil.
Check the oil level every time before using to
ensure it is correct. The machine should be
standing on level ground.
Wipe clean round the oil dipstick. Un-
screw and pull it up. Wipe off the dipstick.
Slide it down completely and tighten it.
Then unscrew it and pull it up again. Read-off the
oil level. Top up with oil to the “FULL“ mark, if
the level comes below it (figs. 13 – 15).
CHECKING THE TRANSMISSION
OIL LEVEL (President - Royal - Pro16
-Pro20)
The transmission is filled with SAE 10W-40 oil
when the machine is delivered from the factory,
Check the oil level every time before using to
ensure it is correct. The machine should be
standing on level ground.
Read off the oil level in the reservoir (fig. 29). It
should be between the “MAX“ and “MIN“ marks.
If necessary, top up with more oil. Use oil SAE
10W-40 (20W-50).
SAFETY SYSTEM
This machine is equipped with a safety system that
consists of:
- a switch on the gearbox (only Senator).
- a switch at the brake pedal.
- a switch in the seat (Senator, President) or the
seat bracket (other models).
- a switch at the power take-off engagement le-
ver.
In order to start the machine, the following are nec-
essary:
- gear lever in neutral (only Senator).
- brake pedal pressed down.
- driver sitting on seat.
- power take-off engagement lever in forward po-
sition (i.e. power take-off disengaged).
Always check the operation of the safe-
ty system before using the machine!
With the engine operating and the driver sitting on
the seat, check in the following way:
- select a gear, lift your weight off the seat – the 
						

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engine must stop (applies to Senator).
- press the drive pedal so that the machine starts
to move, release the drive pedal – the machine
must stop (applies to President, Royal, Pro16,
Pro20).
- press the drive pedal so that the machine starts
to move, engage the cruise control, lift your
weight off the seat – the machine must stop (ap-
plies to Royal, Pro16, Pro20).
- press the drive pedal so that the machine starts
to move, engage the cruise control, press the
brake pedal – the machine must stop (applies to
Royal, Pro16, Pro20).
- engage the power take-off, lift your weight off
the seat – the engine must stop (applies to Sen-
ator, President, Royal, Pro16).
- engage the power take-off, lift your weight off
the seat, the power take-off must be disengaged
(applies to Pro20).
Do not use the machine if the safety sys-
tem does not work! Take the machine to
a service agent for inspection!
STARTING ENGINE
1. Open the fuel cock (fig. 16).
2. Make sure that the sparking plug cable is prop-
erly in place.
3. Check to make sure that the power take-off is
disengaged.
4a. Senator:
Put the gear lever in neutral
4b. President - Royal - Pro16 - Pro20):
Do not keep your foot on the drive pedal.
5a. Senator-President:
Starting cold engine – put the throttle control in the
choke position. Starting warm engine – put the
throttle control at full throttle (approx. 1 cm behind
the choke position).
5b. Royal-Pro1-Pro20:
Putthethrottlecontrolatfullthrottle.Startingcold
engine – pull the choke control out fully. Starting
warm engine – do not touch the choke control.
6. Depress the brake pedal fully.
7. Turn the starter key and start the engine.
8a. Senator-President:
Once the engine has started, move the throttle con-
trol gradually to full throttle if the choke has been
used.8b. Royal-Pro16-Pro20:
Once the engine has started, push the choke control
in gradually if it has been used.
9. When starting from cold, do not make the ma-
chine work under load immediately, but let the en-
gine run for some minutes first. This will allow the
oiltowarmup.
When in use, always operate the engine at full
throttle.
STOPPING
Disengage the power take-off. Apply the parking
brake.
Allow the engine to idle 1 - 2 mins. Stop the engine
by turning off the ignition key.
Shut off the petrol cock. This is particularly impor-
tant if the machine is to be transported on a trailer
for example.
If the machine is left unattended, re-
move the lead from the spark plug. Also
removethestarterkey.
The engine may be very warm immedi-
ately after it is shut off. Do not touch the
silencer, cylinder or cooling flanges.
This can cause burn injuries.
CATALYTIC CONVERTER (Pro20
Cat)
The catalytic converter gets very hot during opera-
tion. The heat remains for a long time after the en-
gine has been stopped. Be aware of the fire risk.
Do not park in close proximity to in-
flammable objects. Do not cover the
machine until the catalytic converter
has cooled down.
STEERING AID (Pro20)
Built-in function in order to facilitate steering. The
operator only has to turn the steering wheel gently.
An hydraulic torque amplifier creates the remain-
ing force.
As opposed to a normal servo steering (e.g. in a
car), the steering aid has a limited capacity. This
means that it has some characteristics that might be
considered negative:
- at a low engine revs or in situations where extra
steering force is needed, steering can be consid-
ered to be “jumpy“. 
						

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- the machine should always be moving when the
steering
is used. Avoid turning the steering wheel when
the machine is standing completely still and the
accessory is in the lowered working position.
The steering is adapted in order to produce better
results at a normal working speed. This produces
major benefits.
Even when the engine is not running, the steering
works. However, it is harder to turn in this case, if
the machine is to be manoeuvred manually.
MOWING TIPS
Make sure that there is the correct quantity of oil in
the engine when driving on slopes (oil level on
“FULL“).
Be careful when driving on slopes. No
sudden starting or stopping when mov-
ing up or down a slope. Never drive
across a slope. Move from the top down,
and from the bottom to the top.
The machine, equipped with original
accessories, must not be driven on
slopes greater than 10º in any direction.
Reduce the speed on slopes and when
making sharp turns to prevent the ma-
chine from tipping over and to prevent
you losing control of the machine.
Do not turn the steering wheel to full
lock when driving in top gear and at full
throttle. The machine can easily topple
over.
Keep hands and fingers well away from
articulated steering joint and seat
bracket. Risk of crushing injuries. Nev-
er operate the machine without the en-
gine casing.
SERVICE AND MAINTENANCE
SERVICE PROGRAM
In order to keep the machine in good condition as
regards reliability and operational safety as well as
from an environmental perspective, STIGA’s serv-
ice program should be followed.
The contents of this program can be found in the
attached service log.We recommend that an authorised workshop car-
ries out every service. This guarantees that the
work is performed by trained personnel and with
original spare parts.
At every service, the service log should be
stamped. A “fully stamped“ service log is a valua-
ble document that improves the machine’s second-
hand value.
PREPARATIONS
Unless otherwise stated, all service and mainte-
nance must be carried out on a stationary machine
when the engine is not running.
Prevent the machine from rolling by al-
ways applying the parking brake.
Prevent unintentional starting of the
engine by always stopping the engine,
disconnecting the spark plug cable
from the spark plug and earthing it.
Disconnect the negative cable from the
battery.
CLEANING
To reduce the risk of fire, keep the en-
gine, silencer/catalytic converter, bat-
tery and fuel tank free from grass,
leaves and oil.
To reduce the risk of fire, regularly
check the machine for oil and/or fuel
leakage.
When washing the machine with water under high
pressure, do not point the jet directly at the trans-
mission.
Do not point jets of water directly at the engine.
Use a brush or compressed air in order to clean it.
ENGINE OIL (President - Royal -
Pro16 - Pro20)
Change the oil for the first time after 8 hours run-
ning (Senator and President after 5 hours), and
then after every 50 hours running or once a year.
Change oil when the engine is warm.
Always use a good grade of oil (service grade SF,
SG or SH).
Change the oil more often (after 25 hours of run-
ning or at least once a season) if the engine has to
operate under demanding conditions or if the am-
bient temperature is high. 
						

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The engine oil may be very warm if it is
drained off directly after the engine is
shut off. Therefore, allow the engine to
cool a few minutes before draining the
oil.
1. Oil drain pipe (metal):
Unscrew the oil drain plug at the end of the pipe.
Let the oil run out into a collection vessel. Then
take the oil to a recycling station. Do not allow
oil to get on the V-belts.
2. Screw in the oil drain plug. Make sure that the
fibre gasket and the O-ring inside the plug are not
damaged and that they are in the correct place.
3. Remove the dipstick and fill up with new oil.
Oil capacity:
Senator, President – 1.4 l
Pro16, Pro20 - 1.7 l (including oil filter)
Oil type, summer (> 4º C): SAE-30
(SAE 10W-30 can also be used. However, oil con-
sumption may increase somewhat if 10W-30 is
used. Therefore, check the oil level more regularly
if you use this type of oil).
Oil type, winter (< 4º C): SAE 5W-30
(if this oil is not available, use SAE 10W-30).
Use oil without any additives.
Do not fill with too much oil. This can cause the
engine to overheat.
After filling up the oil, start the engine and idle for
30 seconds. Stop the engine. Wait for 30 seconds
and then check the oil level.
Check to see if there is any oil leakage. If neces-
sary,filluptheoiluptothe“FULL“mark.
ENGINE OIL (Royal)
Change the oil for the first time after 20 hours run-
ning (or during the first month), and then after eve-
ry 100 hours running or once every 6 months.
Change oil when the engine is warm. Always use
a good grade of oil (service grade SF, SG or SH).
The engine oil may be very warm if it is
drained off directly after the engine is
shut off. Therefore, allow the engine to
cool a few minutes before draining the
oil.
Unscrew the oil drain plug at the end of the pipe
(fig. 17).Let the oil run out into a collection vessel. Then
take the oil to a recycling station. Do not allow
oil to get on the V-belts.
Screw in the oil drain plug. Make sure that the fibre
gasket and the O-ring inside the plug are not dam-
aged and that they are in the correct place.
Remove the dipstick and fill up with new oil up to
the “UPPER“ mark.
Oil capacity:
Royal - 0.9 l (= oil quantity at change. In total the
engine holds 1.15 l).
Oil type for all seasons: SAE 10W-40.
For extremely low temperatures (< -20° C), use
SAE 5W-30.
Use oil without any additives.
Do not fill with too much oil. This can cause the
engine to overheat.
OIL FILTER – ENGINE (Pro16 -
Pro20)
Replace the oil filter after every 100 hours of oper-
ation or once a season.
Before screwing the new filter, oil the filter gasket
with engine oil.
Screw the filter by hand, until the filter gasket
touches the filter attachment. Then tighten ½ to ¾
of a full turn (fig. 18).
Start the engine andidleto see if any leakage oc-
curs. Stop the engine. Check the oil level. If neces-
sary,filluptheoiluptothe“FULL“mark.
AIRFILTER-ENGINE
Senator - President - Pro16 - Pro20:
Clean the foam pre-filter every 3 months or after
every 25 hours of operation, whichever comes
first.
Clean the paper filter insert once a year or after
every 100 hours of operation, whichever comes
first.
Royal:
Clean the air filter every 3 months or after every 50
hours of operation, whichever comes first.
Clean the paper filter insert once a year or after
every 200 hours of operation, whichever comes
first. 
						

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All models:
Note! The filters should be cleaned more often if
the machine operates on dusty ground.
1. Loosen the wing nut under the fuel tank and
move it backwards (fig. 16). Also loosen the bat-
tery to make it easier to get at the air filter (applies
to Pro16-Pro20).
2. Remove the air filter’s protective cover (fig. 19
- 21).
3. Dismantle the paper filter insert and the foam
pre-filter. Make sure that no dirt gets into the car-
burettor. Clean the air filter housing.
4. Wash the pre-filter in liquid detergent and water.
Squeeze dry. Pour a little oil on the filter and
squeeze in the oil.
5. Clean the paper filter insert as follows: Knock it
lightly against a flat surface. If the filter is very
dirty, change it.
6. Assemble in the reverse order.
Petroleum-based solvents such as kerosene must
not be used for cleaning the paper filter insert as
these can destroy the filter.
Do not use compressed air for cleaning the paper
filter insert. The paper filter insert must not be
oiled.
AIRFILTER–CATALYTICCONVERT-
ER (Pro20 Cat)
Clean the catalytic converter’s air filter every 3
months or after every 25 hours of operation,
whichever comes first.
1. Remove the cover by pressing in the locking
mechanism with a screwdriver etc. (fig. 22).
2. Remove the foam filter and wash it in liquid de-
tergent and water. Squeeze dry. Do not oil the filter.
3. Replace the filter and snap the cover into place.
SPARKING PLUG
Only use a Briggs & Stratton sparking tester to
check the spark in the sparking plug(s) (fig. 23).
Clean the sparking plug after every 100 hours of
operation or once a season. For replacing a spark-
ing plug, a sparking plug sleeve A and a torsion pin
B are provided in the accessories bag.
The engine manufacturer recommends:
Senator-President: Champion J19LMRoyal: NGK BPR5ES or DENSO W16EPR-U
Pro16-Pro20: Champion RC12YC
Correct spark gap: 0.75 mm.
COOLING AIR INTAKE - ENGINE
The engine is air-cooled. A blocked cooling sys-
tem can damage the engine. The engine should be
cleaned at least once a year or every 100 hours of
operation.
Remove the fan casing. Clean the cooling fins on
the cylinder, the fan and the rotating protective
grille (fig. 24 - 25). Clean more frequently if mow-
ing dry grass.
BATTERY
The battery is a valve-regulated battery with 12 V
nominal voltage. The battery is completely main-
tenance free. You don’t have to check or top up the
electrolyte level.
On delivery, the battery is in the accessories box.
The battery must be fully charged be-
fore being used for the first time. The
battery should always be stored fully
charged. If the battery is stored for
longer than 10 days without being
charged, it can be damaged.
If the machine is not going to be used for an ex-
tended period (more than 1 month), the battery
should be charged, disconnected and then stored in
a cool, safe place. Charge the battery completely
before reinstalling.
Thebatterycanbechargedintwoways:
1. Via a battery charger (recommended). This must
be a charger with constant voltage. The battery
can be damaged if a standard type battery
charger (for acid batteries) is used.
Stiga recommends battery charger with item no.
1136-0602-01 which may be ordered by an au-
thorised dealer.
2. You can also allow the engine to charge the bat-
tery. In this case it is very important, above all
when starting the machine for the first time and
when it has not been used for a long time, to al-
low the engine to run continuously for at least
45 minutes. 
						

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Do not short circuit the battery’s termi-
nals. Sparks occur which can result in
fire. Do not wear metal jewellery which
can come into contact with the battery
terminals.
In the event of damage to the battery
casing, cover, terminals or interference
to the strip covering the valves, the bat-
tery should be replaced.
If the battery terminals are coated with oxide, they
should be cleaned. Clean the battery terminals with
a wire brush and grease them.
LUBRICATION - CHASSIS
The machine’s articulated steering joint has four
grease nipples that should be lubricated with uni-
versal grease after every 25 hours of operation
(fig. 26).
Note: Please note that the fourth grease nipple is
not shown on the picture. It is located on the under-
side, on the flexible axle’s front bearing.
Senator-President-Royal:
Lubricate the steering cables and steering chain
with universal grease a couple of times per season.
Pro16-Pro20:
Apply universal grease to the steering chains a
couple of times each season. If the steering chains
are really dirty, dismantle them, wash them and
then grease them once more.
Apply universal grease to all the plastic bearings a
couple of times per season.
Apply a coating of engine oil to the tension arm
joints a couple of times each season.
Apply a few drops of engine oil to both ends of the
throttle control cable a couple of times a season.
Senator:
The transmission is filled with oil (SAE 80W-90)
on delivery from the factory. If it is not opened
(which must only be done by a specialist), no top-
ping up of oil should normally be carried out.
STEERING CABLES (Senator - Pres-
ident - Royal)
The steering cables should be adjusted for the first
time after the machine has been in operation for 2 -
3 hours, and then after every 25 hours of operation.
Put the machine in the straight-ahead position.Tension the steering cables by tightening the nuts
that are located on the underside of the articulated
steering joint (fig. 27). The screws in the ends of
the cables should be held firmly during adjustment
so that the cables are not twisted. Use an adjustable
wrench or similar for this purpose, inserting it in
the key handles in the ends of the screws. Tension
until all play is removed.
Adjust both the nuts the same amount to ensure
that the alignment of the steering wheel is not
changed.
Once the adjustment is complete, turn the steering
wheel as far as it will go in either direction. Check
that the chain does not come into contact with the
pulley, and that the cables do not become entan-
gled with the steering pinions.
Do not tension the steering cables too hard. Other-
wise the steering will be heavy and wear and tear
on the cables will increase.
STEERING CHAINS (Pro16 - Pro20)
Adjust the steering chains after every 50 hours of
operation.
Put the machine in the straight-ahead position.
Tension the steering chains by tightening up the
nuts that are located on the underside of the articu-
lated steering joint (fig. 27). Tension until all play
is removed.
Adjust both the nuts the same amount to ensure
that the alignment of the steering wheel is not
changed.
Do not over-tighten the steering chains. This will
cause the steering to become heavy and will in-
crease wear on the steering chains.
PATENT - DESIGN
REGISTRATION
This machine or parts thereof is covered by the fol-
lowing patent and design registration:
9900627-2 (SE), SE00/00250 (PCT), 9901091-0
(SE), SE00/00577 (PCT), 9901730-3 (SE), SE00/
00895 (PCT), 9401745-6 (SE), SE95/00525
(PCT), 595 7497 (US), 95920332.4 (EPC).
99 1095 (SE), 499 11 740.9 (DE), M1990 000734
(IT), 577 251-253 (FR), 115325 (US).
STIGA reserves the right to make alterations to the product
without prior notification.