Lawn Tractor 8211 0276 05 Stiga Park Pro20 Pro16 Royal President Comfort Operators Manual

							
ENGLISHGB
Do not use the machine if the safety sys-
tem is not working! Take the machine 
to a service workshop for inspection! 
STARTING ENGINE
1. Open the fuel cock (fig. 12).
2. Make sure that the spark plug cable is properly 
in place.
3. Check to make sure that the power take-off is 
disengaged. 
4. Do not keep your foot on the drive pedal. 
5a. Comfort-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-Pro16-Pro20:
Put the throttle control at full throttle. Starting cold 
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 ignition key and start the engine.
8a. Comfort-President:
Once the engine has started, move the throttle con-
trol gradually to full thro ttle 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 a few minutes fi rst. This will allow the 
oil to warm up. 
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 starter 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 spark plug cable from the 
spark plug. Also remove the starter key.
The engine may be very warm immedi-
ately after it is shut off. Do not touch the 
silencer, cylinder or cooling fins. 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. 
A hydraulic torque amplifie r creates the remaining 
force.
As opposed to 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 con-
sidered negative:
- at a low engine rpm or in situations where extra  steering force is needed, steering can be consid-
ered to be “jumpy”.
- 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.
DRIVING TIPS
Make sure that there is the correct quantity of oil in 
the engine when driving on slopes (oil level on 
“FULL”).  
						

							
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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, may 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 or 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 
genuine 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 - Comfort - Pro16 - Pro20)
Change the oil for the first time after 5 hours run-
ning, and then after every 50 hours running or once 
a season. 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 oper-
ation or at least once a season) if the engine has to 
operate under demanding conditions or if the am-
bient temperature is high. The engine oil may be very hot if it is 
drained off directly after the engine is 
shut off. So 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. 
Collect the oil in 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-ri ng 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:
Comfort, President - 1.4 l 
						

							
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Pro16, Pro20 - 1.7 l (incl. oil filter)
Oil type, summer (> 4ºC): 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 (< 4ºC): 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, fill up the oil up to the “FULL“ mark.
ENGINE OIL (Royal)
Change the oil for the first time after 20 hours of 
operation (or during the firs t month), and then after 
every 100 hours of operation 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 hot if it is 
drained off directly after the engine is 
shut off. So allow the engine to cool a 
few minutes before draining the oil.
Unscrew the oil drain plug at the end of the pipe 
(fig. 13). 
Collect the oil in 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. 14).
Start the engine and  idle to see if any leakage oc-
curs. Stop the engine. Check the oil level. If neces-
sary, fill up the oil up to the “FULL” mark.
AIR FILTER - ENGINE
Comfort - 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.
All models:
Note! Both filters should be cleaned more often if 
the machine operates on dusty ground.
1. Remove the protective cove r of the air filter (fig. 
15 - 17). 
2. 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.
3a. Pro 16, Pro 20:
Wash the pre-filter in liquid detergent and water. 
Squeeze dry. Pour a little oil on the filter and 
squeeze in the oil.
3b. President, Comfort:
Replace the pre-filter once a year or after every 25 
hours of operation, whichever comes first.
4. Clean the paper filter in sert as follows: Knock it 
lightly against a flat surface. If the filter is very  
						

							
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dirty, change it.
5. Assemble in the reverse order.
Petroleum-based solvents such as kerosene may 
not be used for cleaning the paper filter insert. 
These solvents can destroy the filter.
Do not use compressed air for cleaning the paper 
filter insert. The paper filter insert must not be 
oiled. 
AIR FILTER – CATALYTIC 
CONVERTER (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. 18).
2. Remove the foam filter and wash it in liquid de-
tergent and water. Squeeze dry. Do not oil the fil-
ter.
3. Replace the filter and snap the cover into place.
SPARK PLUG
Only use a Briggs & Stratton sparking tester to 
check the spark in the sparking plug(s) (fig. 19).
Clean the spark plug after every 100 hours of oper-
ation or once a season. For replacing a spark plug, 
a spark plug sleeve A and a torsion pin B are pro-
vided in the accessories bag.
The engine manufacturer recommends:
Royal: NGK BPR5ES or DENSO W16EPR-U
President-Comfort-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. Cl ean the cooling fins on 
the cylinder, the fan and the rotating protective 
grille. Clean more frequently if mowing 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 while 
totally flat it could sustain permanent 
damage. 
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.
The battery can be charged in two ways:
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.
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 th e battery terminals with 
a wire brush and grease them.
LUBRICATION
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. 
20). 
Note: The fourth grease nipple is not shown on the 
picture. It is located on the underside, on the flexi-
ble axle’s front bearing. 
						

							
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Comfort-President-Royal:
Lubricate the steering chain with chain spray a 
couple of times per season.
Pro16-Pro20:
Lubricate the steering chains with chain spray a 
couple of times per season. If the steering chains 
are really dirty, dismantle them, wash them and 
then grease them once more.
Comfort-President-Royal:
The front wheel hub has grease nipples that should 
be lubricated after every 50 hours of operation (fig. 
24).
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 cables a couple of times a season.
The hydrostatic transmission is filled with oil 
(10W-40) on delivery from the factory. Unless it is 
opened (only to be performed by a specialist), and 
provided no leakage occurs, no topping up with oil 
should normally be carried out. Transmission oil 
does not normally need to be changed.
STEERING CABLES 
(President - Comfort - 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 opera-
tion.
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. 21). 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)
The steering chains should be adjusted for the first 
time after the machine has been in operation for 2 
- 3 hours, and then after every 50 hours of opera-
tion.
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. 21). 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).
GGP reserves the right to make alterations to the product 
without prior notification.  
						

							
www.stiga.com
GGP Sweden AB · Box 1006 · SE-573 28 TRANÅS