STIGA PARK
PRO 20
PRO 16
ROYAL
PRESIDENT
SENATOR
8211-0276-02
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PARK
10
11
11
14
9
7
7
9
4. Senator
5. President
13
11
14
11
14
15
8
8
9
7
7
9
16
15
6. Royal
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7. Pro 16
13
14
14
8
8
9
9
12
7
7
12
16
15
15
16
18
17
9. Pro 20
8. Pro 18
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PARK
1
2
2
1
10.
11.
13. Senator - President
15. Pro 16 - Pro 18 - Pro 20
17. Royal
12.
14. Royal
OPEN
16.
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PARK
19. Senator - President
18. Pro 16 - Pro 18 - Pro 20
20. Royal
21. Pro 16 - Pro 18 - Pro 20
0.75 mm
23.
22. Pro 18 - Pro 20
24. Senator - President
25. Royal - Pro 16 - Pro 18 - Pro 20
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PARK
26.
27.
MAX
29a. President - Royal
28.
29b. Pro 16 - Pro 18 - Pro 20
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1. IMPLEMENT LIFTER
GENERAL
A pedal for raising front-mounted accessories to
the transport position.
This symbol indicates WARNING. Per-
sonal injury and/or damage to property
may result if the instructions are not
followed carefully.
To lift up the accessory, press the pedal down as far
as it will go. Then release the pedal, the implement
lifter is now locked in the lift position.
You must read these instructions for use
and the accompanying pamphlet
“SAFETY INSTRUCTIONS” careful-
ly, before starting up the machine.
To lower the accessory, press the pedal down so
that the lock is released. Lower the implement lift-
er to the working position by slowly lifting your
foot from the pedal.
SYMBOLS
2. LIFT HELP (Pro18 - Pro20)
The following symbols are displayed on the ma-
chine in order to remind you about the safety pre-
cautions and attention necessary when using the
machine.
The implement lifter is complemented with adjust-
able lift help in the form of a gas spring. This facil-
itates lifting heavy accessories.
Under the engine casing, on the top of the rear
bumper, there is a setting crank.
The symbols mean:
Warning!
Use this to increase/decrease the lift help.
Read the instruction book and safety man-
ual before using the machine.
Screw anti-clockwise to increase the
lift help if heavy accessories are be-
ing used.
Warning!
Beware of objects being flung out. Keep
spectators away.
Screw clockwise to decrease the lift
help if lighter accessories are being
used.
Warning!
Always use hearing protectors.
3A. SERVICE BRAKE/CLUTCH
(Senator)
Warning!
This machine is not designed to be driven
on public roads.
A pedal that combines both service brake and
clutch. Three positions:
Warning!
1. Pedal released – forward drive
engaged. The machine will
move if a gear is engaged. Serv-
ice brake not activated.
The machine, equipped with original ac-
cessories, must not be driven in any direc-
tion on slopes with a gradient greater than
10º.
2. Pedal depressed halfway –
forward drive disengaged, gear
shifting can be performed. Serv-
ice brake not activated.
Warning!
Clamp risk. Keep hands and feet well
away from the articulated steering joint.
Warning!
3. Pedal fully depressed – for-
ward drive disengaged. Service
brake fully activated.
Risk for burn injuries. Do not touch the si-
lencer/catalytic converter.
NOTE! You must never regulate the operating
speed by slipping the clutch. Use a suitable gear in-
stead, so that the right speed is obtained.
CONTROLS AND
INSTRUMENTS
3B. SERVICE BRAKE (President -
Royal - Pro16 - Pro18 - Pro20)
Items 1 - 20, see figures 1 - 9
A pedal that acts upon the machine’s braking sys-
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tem. There are 3 positions:
1. Pedal released – service brake
7. THROTTLE/CHOKE CONTROL
A control for setting the engine speed and to choke
the engine when starting from cold (the latter does
not apply to Royal-Pro16-Pro18-Pro20 which
have separate choke control – see item 8).
not activated.
2. Pedal depressed halfway –
forward drive disengaged. Serv-
ice brake not activated.
1. Choke – for starting a cold engine. The
choke is located in top of groove (does not
apply to Royal- Pro16-Pro18-Pro20).
3. Pedal fully depressed – for-
ward drive disengaged. Service
brake fully activated.
2. Full throttle – when the machine is in
operation, full throttle should always be
used.
4. PARKING BRAKE
An inhibitor that can lock the brake pedal in the de-
pressed position.
3. Idle running.
Depress the brake pedal fully. Move the
inhibitor to the right and then release the
brake pedal.
8. CHOKE CONTROL (Royal - Pro16 -
Pro18 - Pro20)
The parking brake is released by pressing the brake
pedal. The spring-loaded inhibitor slides to one
side.
A pull-type control to choke the engine when start-
ing from cold.
1. Control fully pulled out – choke valve
in carburettor closed. For starting cold en-
gine.
Make sure that the parking brake is released when
operating the machine.
5. DRIVE PEDAL (President - Royal -
Pro16 - Pro18 - Pro20)
2. Control pushed in – choke valve open.
For starting warm engine and when oper-
ating the machine.
A pedal that activates the variable transmission.
Never operate the machine with the choke
pulled out when the engine is warm.
1. Depress the pedal with the
ball of your foot – the machine
moves forwards.
9. IGNITION LOCK/SPOTLIGHT
2. No load on the pedal – the ma-
chine is stationary.
Ignition lock used for starting/stopping the engine.
Also includes switch for spotlight (Senator does
not have a spotlight). Four positions:
3. Depress the pedal with your
heel – the machine reverses.
1. Stop position – the engine is short-
circuited. The key can be removed.
The drive pedal regulates the speed. The more
pressure applied, the faster the machine will move.
2. Operating position – spotlight activat-
ed.
6. ADJUSTABLE STEERING WHEEL
(President - Royal - Pro16 - Pro18 -
Pro20)
3. Operating position – spotlight not acti-
vated.
The steering wheel can be adjusted vertically in 5
positions. Press in the inhibitor on the steering col-
umn and raise or lower the steering wheel to the
desired position.
4. Start position – the electric start motor
is activated when the key is turned to the
spring-loaded start position. Once the en-
gine has started, let the key return to oper-
ating position 3.
Do not adjust the steering wheel during opera-
tion.
To turn on the spotlight, turn the key to position 2.
NOTE! If the key is turned from the stop posi-
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tion to operating position 2, the spotlight is acti-
vated. This uses up battery power. Do not leave
the machine with the key in position 2 (applies
to Pro16-Pro18-Pro20).
tion.
2. Backward position – the differential in-
hibitor is engaged. For normal operation.
Works for both forward and reverse drive.
10. GEAR LEVER (Senator)
The differential lever is of greatest use when the
rear wheels are unevenly loaded. For example,
when driving across a slope, where the upper rear
wheel is not as loaded, as wheel as when turning
sharp corners where the inner rear wheel bears a
lesser load.
A lever for selecting one of the five forward gears
in the gearbox (1-2-3-4-5), neutral (N) or reverse
(R).
The clutch pedal must be kept pressed in when
changing gear.
When driving during the winter on slippery surfac-
es, the drive capacity is improved if snow chains
are not used.
NOTE! You must make sure the machine is quite
stationary before changing from reverse to forward
gear or vice versa. If a gear does not engage imme-
diately, release the clutch pedal and then press it in
once again, then engage the gear once again. Never
force a gear in.
When the differential inhibitor is engaged, the
steering is heavy. Avoid turning the steering
wheel!
14. HOUR METER (President - Royal
- Pro16 - Pro18 - Pro20)
11. POWER TAKE-OFF (Senator -
President - Royal - Pro16)
Indicates the number of working hours. Only
works when the engine is running.
A lever for engaging and disengaging the power
take-off for driving front-mounted accessories.
There are two positions:
15. CRUISE CONTROL (Royal - Pro16
- Pro18 - Pro20)
1. Lever in forward position – power take-
off disengaged.
A switch for activating the cruise control. The
function of the cruise control allows the drive ped-
al (5) to be locked in the desired position. You do
not need to use your right foot.
2. Lever in backward position - power
take-off engaged.
1. Press down the drive pedal until the de-
sired speed is obtained. Then press the
front part of the switch to activate the
cruise control. The symbol will light up.
12. POWER TAKE-OFF (Pro18 -
Pro20)
Switch for engaging/disengaging the electromag-
netic power take-off for driving front-mounted ac-
cessories. There are two positions:
2. Disengage the cruise control by press-
ing the rear part of the switch.
1. Press the front part of the switch – the
power take-off is engaged. The symbol
lights up.
16. CUTTING HEIGHT ADJUSTMENT
(Pro16 - Pro18 - Pro20)
2. Press the rear part of the switch – the
power take-off is disengaged.
The machine is equipped with a control for using
the mower deck with electrical cutting height ad-
justment (available as an accessory).
13. DIFFERENTIAL INHIBITOR
(Pro16 - Pro18 - Pro20)
The switch is used to adjust the cutting
height in continuously variable positions.
Lever for engaging the differential inhibitor. This
improves the towing capacity by locking the rear
wheels so that both wheels drive simultaneously.
There are two positions:
The contact used for connecting the mower deck is
mounted on the right side, in front of the front tyre
(fig. 2).
17. REAR RAKE (Pro20)
1. Forward position – the differential in-
hibitor is not engaged. For normal opera-
The machine has been designed for electrical ad-
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justment of a rear rake (available as an accessory).
1. Mowing
The switch is used to raise and lower the
rear rake.
Using mower deck 13-2927 (107M), 13-2917
(110S), 13-2915/13-2921 (121M) or flail mow-
er 13-1977.
Connection cables for the rake are located to the
rear of the machine, to the left on the top of the
bumper (Pro16 and Pro18 are prepared for a rear
rake).
2. Sweeping
Using brush unit 13-1933 or collector brush
unit 13-1939. Use of dust guard 13-1936 is rec-
ommended with the first option.
18. SAND SPREADER (Pro20)
3. Snow clearance
The machine has been designed for electrical ad-
justment of a sand spreader (available as an acces-
sory).
Using snow blade 13-1916 or snow thrower 13-
1948. Snow chains 13-1956 (16”)/13-0902
(17”) and wheel weights 13-1982 are recom-
mended.
The switch is used to start and stop the
12V
spreader.
4. Grass clipping and leaf collection
A connection contact for the sand spreader is locat-
ed to the rear of the machine, to the left on the top
of the bumper (Pro16 and Pro18 are prepared for a
sand spreader).
Using towed collector 13-1978 (30”) or 13-
1950 (42”).
5. Grass and leaf transport
Using dump cart 13-1979 (Standard), 13-1988
(Maxi) or 13-1992 (Combi).
19. DISENGAGING LEVER (Presi-
dent - Royal - Pro16 - Pro18 - Pro20)
6. Sand spreading
A lever for disengaging the variable transmission.
Enables the machine to be moved by hand without
the help of the engine. There are two positions:
Using sand spreader 13-1975. Can also be used
for spreading salt. Snow chains 13-1956 (16”)/
13-0902 (17”) and wheel weights 13-1982 are
recommended.
1. Lever moved back – transmis-
sion engaged for normal opera-
tion.
7. Weeding on gravel paths
Using front mounted hoe 13-1944 and rear-
mounted rake 13-1969.
2. Lever moved forward – trans-
mission disengaged. The ma-
chine can be moved by hand.
8. Lawn edge trimming
Using edge trimmer 13-0905.
9. Moss scarification
To avoid damage to the transmission, do not tow
the machine for any great distance.
20. FUEL GAUGE/FUEL CAP
Using moss scarifier 13-1984.
Fuel cap with built-in fuel gauge that indi-
cates how much fuel there is in the fuel
tank. (applies to Royal-Pro16-Pro18-
Pro20)
The maximum vertical load on the towing hitch
must not exceed 100 N.
The maximum over-run load on the towing hitch
from towed accessories must not exceed 500 N.
Senator and President have a fuel cap without a
fuel gauge.
NOTE! Before using a trailer – contact your insur-
ance company.
The fuel tank has a capacity of 11.5 l.
NOTE! This machine is not intended to be driven
on public roads.
AREAS OF USE
The machine may only be used for the following
tasks using the STIGA accessories stated.
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CHECKING THE ENGINE OIL LEVEL
START AND OPERATING
On delivery, the crankcase is filled with SAE 30
oil.
ENGINE CASING
Check the oil level every time before using to
ensure that it is correct. The machine should be
standing on level ground.
To inspect and maintain the engine and battery, re-
move the engine casing as follows:
1. Unscrew the fuel cap/fuel gauge.
2. Carefully lift off the engine casing (fig. 10).
Assembly:
Wipe clean round the oil dipstick, remove
it and wipe off. Push down the dipstick
fully and screw it back in.
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).
1. Make sure that the front part of the casing fits
into the track in the U-shaped attachment on the
machine (fig. 11).
CHECKING THE TRANSMISSION
OIL LEVEL (President - Royal - Pro16
- Pro18 - Pro20)
2. Place the casing over the lip on each side
(fig. 11).
3. Make sure that the pins on the back edge of the
casing go down into the respective holes (fig. 12).
The transmission is filled with SAE 10W-40 oil
when the machine is delivered from the factory,
4. Finally, screw in the fuel cap/fuel gauge.
Check the oil level every time before using to
ensure it is correct. The machine should be
standing on level ground.
Do not use the machine without first fit-
ting the engine casing, otherwise there
is a risk of burn injuries or crushing ac-
cidents.
Read off the oil level in the reservoir (fig. 29). It
should be between the MAX and MIN marks. If
necessary, top up with SAE 10W-40 (20W-50) oil.
FILLING THE FUEL TANK
Always use lead-free petrol. Never use oil-mixed
petrol.
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.
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 be used. This
type of petrol has a composition that is less hazard-
ous for people and nature.
- a switch in the seat mounting (Senator, Presi-
dent) or the seat bracket (other models).
- a switch at the power take-off engagement.
Petrol is highly inflammable. Always
store petrol in containers that are made
especially for this purpose.
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 at lowest set-
ting (i.e. power take-off disengaged).
Only fill or top up with petrol outdoors,
and never smoke when filling or top-
ping up. Fill with petrol before starting
the engine. Never remove the filler cap
or fill with petrol while the engine is
running or still warm.
Always check the operation of the safe-
ty system before using the machine!
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).
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
engine must stop (applies to Senator).
- press the drive pedal so that the machine starts
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to move, release the drive pedal – the machine
in gradually if it has been used.
must stop (applies to President, Royal, Pro16,
Pro18, 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, Pro18, 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, Pro18, Pro20).
- engage the power take-off, lift your weight off
the seat – the engine must stop (applies to Sen-
ator, President, Royal, Pro16).
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
oil to warm up.
When in use, always operate the engine at full
throttle.
STOPPING
Disengage the power take-off and apply the park-
ing brake.
Allow the engine to idle 1 - 2 mins. Stop the engine
by turning off the ignition key.
- engage the power take-off, lift your weight off
the seat, the power take-off must be disengaged
(applies to Pro18, Pro20).
Shut off the petrol cock. This is particularly impor-
tant if the machine is to be transported on a trailer
for example.
Do not use the machine if the safety sys-
tem does not work! Take the machine to
a service agent for inspection!
If the machine is left unattended, re-
move the lead from the spark plug. Also
remove the starter key.
STARTING ENGINE
The engine may be very warm immedi-
ately after it is shut off. Do not touch the
silencer, cylinder or cooling flanges as it
can cause burns and injury.
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.
CATALYTIC CONVERTER (Pro18 -
Pro20)
4a. Senator:
Put the gear lever in neutral
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 fire risk.
4b. President-Royal-Pro16-Pro18-Pro20:
Do not keep your foot on the drive pedal.
Do not park in close proximity to in-
flammable objects. Do not cover the
machine until the catalytic converter
has cooled down.
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).
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.
5b. Royal-Pro16-Pro18-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.
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 rpm or in situations where extra
steering force is needed, steering can be consid-
ered to be “jumpy”.
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.
- the machine should always be moving when the
steering is used. Avoid turning the steering
8b. Royal-Pro16-Pro18-Pro20:
Once the engine has started, push the choke control
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wheel when the machine stands completely still
and the accessory is in the lowered working po-
sition.
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.
The steering is adapted in order to produce better
results at a normal working speed.
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.
PREPARATIONS
Unless otherwise stated, all service and mainte-
nance must be performed on a machine that is
standing still where the engine is not running.
OPERATING
Make sure that there is the correct quantity of oil in
the engine when driving on slopes (oil level on
“FULL”).
Prevent the machine from rolling, by al-
ways applying the parking brake.
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 and
down, and from down to the top.
Prevent involuntary engine start by al-
ways stopping the engine, loosening the
spark plug cable from the sparking
plug and earthing it. Remove the minus
(-) cable from the battery.
The machine, equipped with original
accessories must not be driven on slopes
greater than 10º in any direction.
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.
Reduce the speed on slopes and when
moving the machine in sharp turns to
prevent the machine from tipping over
or that you lose control over the ma-
chine.
To reduce the risk of fire, regularly
check the machine for oil and/or fuel
leakage.
Do not turn the steering wheel to full
lock when driving in top gear and at full
throttle, as the machine can easily top-
ple over.
When washing the machine with water under high
pressure, do not point the jet directly at the trans-
mission.
Keep hands and feet well away from ar-
ticulated steering joint and seat bracket
to avoid having them squeezed. Never
operate the machine without the engine
casing.
Do not point jets of water directly at the engine,
use a brush or compressed air in order to clean it.
CHANGING ENGINE OIL
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.
SERVICE AND MAINTENANCE
SERVICE PROGRAM
Always use a good grade of oil (service grade SF,
SG or SH).
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.
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.
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
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The engine oil may be very warm if it is
AIR FILTER - ENGINE
drained off directly after the engine is
shut off. Therefore, allow the engine to
cool a few minutes before draining the
oil.
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.
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.
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-Pro18-Pro20).
2. Screw up 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.
2. Remove the protective cover of the air filter (fig.
19 - 21).
Oil capacity:
Senator, President – 1.4 l
Royal – 1.9 l (including oil filter)
Pro16, Pro18, Pro20 - 1.7 l (including oil filter)
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.
Oil type summertime (> 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).
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.
Oil type winter (< 4º C): SAE 5W-30
(if this oil is not available, use SAE 10W-30).
6. Assemble in the reverse order.
Use oil without any additives.
Petroleum-based solvents such as kerosene must
not be used for cleaning the paper filter insert as
these can destroy the filter.
Do not fill too much oil as this can result in over-
heating the engine.
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.
Do not use compressed air for cleaning the paper
filter insert. The paper filter insert must not be
oiled.
Check to see if there is any oil leakage. If neces-
sary, fill up the oil up to the “FULL” mark.
AIR FILTER - CATALYTIC CONVERT-
ER (Pro18 - Pro20)
OIL FILTER - ENGINE (Royal - Pro16
- Pro18 - Pro20)
Clean the catalytic converter’s air filter every 3
months or after every 25 hours of operation,
whichever comes first.
Replace the oil filter after every 100 hours of oper-
ation or once a season.
1. Remove the cover by pressing in the locking
mechanism with a screwdriver, etc. (fig. 22).
Before screwing the new filter, oil the filter gasket
with engine oil.
2. Remove the foam filter and wash it in liquid de-
tergent and water. Squeeze dry. Pour a little oil on
the filter and squeeze in the oil.
Screw the filter by hand, until the filter gasket
touches the filter attachment. Then tighten ½ to ¾
of a full turn (fig. 17 - 18).
3. Replace the filter and snap the lock into place.
SPARKING PLUG
Start the engine and idle to see if any leakage oc-
curs. Switch off the engine, check the oil level. If
necessary, fill up the oil up to the “FULL” mark.
Only use a Briggs & Stratton sparking tester to
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check the spark of the sparking plug(s) (fig. 23).
Senator-President-Royal:
Lubricate the steering cables and steering chain
with universal grease a couple of times per season.
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.
Pro16-Pro18-Pro20:
Apply universal grease to the steering chain a cou-
ple of times each season. If the steering chains are
really dirty, dismantle them, wash them and then
grease them once more.
The engine manufacturer recommends:
Senator-President: Champion J19LM
Royal-Pro16-Pro18-Pro20: Champion RC12YC
Apply universal grease to all the plastic bearings a
couple of times per season.
The correct distance between the electrodes is 0.75
mm.
Apply a coating of engine oil to the tension arm
joints a couple of times each season.
COOLING AIR INTAKE - ENGINE
Apply a few drops of engine oil to both ends of the
throttle control cable a couple of times a season.
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.
Senator:
The transmission is filled with oil (SAE 80W-90)
upon delivery from the factory. If it is not opened
(which must only be done by a specialist), normal-
ly no topping up of oil should be carried out.
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.
STEERING CABLES (Senator -
President - Royal)
BATTERY
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.
Check the acid level regularly.
The acid level should be between “UPPER “ and
“LOWER” on the battery. When adjusting the lev-
el, only use distilled water (battery water).
Put the machine in the straight-ahead position.
The battery acid is extremely corrosive
and can cause burns and injuries to
skin and clothing. Always use rubber
gloves and glasses (goggles) to protect
the eyes. Avoid inhaling any acid va-
pour.
Tension the steering cables by tightening up the
nuts that are located on the underside of the articu-
lated steering joint (fig. 27). The screws in the ends
of the cables should be held firmly during adjust-
ment so that the cables are not twisted. Use an ad-
justable wrench or similar for this purpose,
inserting it in the key handles in the ends of the
screws. Tension the cables until they are no longer
slack.
Do not incline the battery too much so
that the battery acid can run out on to
hands and clothing. If this should hap-
pen, flush with lots of water.
Adjust both the nuts the same amount to ensure
that the alignment of the steering wheel is not
changed.
If the battery terminals are coated with oxide, they
should be cleaned. Clean the battery terminals with
a wire brush and grease them.
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.
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).
Do not tension the steering cables too hard. Other-
wise the steering will be heavy and wear and tear
on the cables will increase.
Please note that the fourth grease nipple is not
shown on the picture. It is located on the underside,
on the flexible axle’s front bearing.
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ENGLISH
STEERING CHAINS (Pro16 - Pro18 -
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 chain. This will
cause the steering to become heavy and will in-
crease wear on the steering chain.
PATENT –
PROTECTION OF DESIGNS
This machine, or parts thereof, is protected by the
following patent and protection of design:
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 modify the product without giv-
ing any prior notice.
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