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Operating Manual – Snowthrower English
21
Maintenance tasks
Risk of injury
Before doing any work on this
machine
– Turn off the engine.
– Remove the ignition key and the
spark-plug connector.
– Wait until the engine has cooled
down.
Caution
Risk of damage to the machine
When replacing parts of the machine
use only original spare parts.
Clean the machine
• Park the machine on a firm, even
and horizontal piece of ground.
• Remove any dirt sticking to it.
• Clean the machine by pouring
water through the throw-out chute,
leave it to dry.
• Clean engine with a cloth and
brush.
Lubrication
Lubricate all rotating and mobile
parts with a light oil.
Adjust tyre pressure
(STH 5.56, STH 8.66)
Recommended tyre pressure
approx. 1 bar.
Maintenance work on the engine
See “Engine instructions”.
Adjust coupling for the worm
drive
Figure 3
Check the state of the coupling:
• Press left coupling lever (1)
forwards (direction I); at the same
time press down rubber (3).
Coupling cable (5) must be a little
slacker. Slacken it if necessary
(see “Making adjustments to the
coupling cable”).
• Release the coupling lever (1).
There must be no slackness on the
coupling cable (5) but it must not
be taut either. Adjust if necessary
(see “Making adjustments to the
coupling cable”).
• The coupling lever (1) must allow
itself to be pressed down
completely. If it does not, the
coupling cable is tightened too
firmly and must be slackened
(see “Making adjustments to the
coupling cable”).
Adjust coupling for the drive
system
Figure 1
• (Machines with caterpillar drive)
Set setting lever (Figure 4, item 1)
to position III (Transport).
• Set shift lever (6) to the fastest
forward gear (highest figure).
• Having released the coupling lever
(2), push the machine forwards.
• While you are pushing the
machine, set shift lever (6) to the
fastest reverse gear “R ” and
then set it to the fastest forward
gear.
• If some resistance is felt while
you are pushing the machine or
changing gear, you need to
slacken the coupling cable (see
“Making adjustments to the
coupling cable”).
• While you are pushing the
machine, press coupling lever (2).
The wheels/caterpillar tracks must
become blocked. If not, tighten the
coupling cable a little (see “Making
adjustments to the coupling
cable”).
• If you have not been able to make
a perfect adjustment or if in doubt
about the result, see “Checking the
drive system”.
Making adjustments to the
coupling cable
Figure 3
• For coupling cables with adjusting
sleeves (6)
– Tighten: loosen nut (7) and
screw adjusting sleeve (6)
against it.
– Slacken: loosen adjusting
sleeve (6) and screw nut (7)
against it.
• For coupling cables with load-
removal spring (8): Before making
an adjustment the spring must be
unhooked and afterwards hooked
on again. The coupling cable is
correctly adjusted when the spring
expands 2 to 3 cm when coupling
takes place.
– Tighten: Screw lock-nut (9)
upwards.
– Slacken: Screw lock-nut (9)
downwards.
Checking the drive system
Figure 10
Caution
Risk of damage to the machine
Take care when tipping the machine
to see that
– the machine stays balanced and
– no fuel or oil runs into the air filter
or out of the machine.
• Loosen screws to frame cover;
if necessary tip the machine
forwards.
• With the coupling lever for the
drive system released (Figure 1,
item 2) change into all gears; in
doing so the friction wheel (2)
should not come into contact with
the drive wheel (3). If it does,
slacken the coupling cable (see
“Making adjustments to the
coupling cable”).
• In each gear, press the coupling
lever for the drive system; the
friction wheel must make contact
with the drive wheel. If it does not,
tighten the coupling cable (see
“Making adjustments to the
coupling cable”).
• As required clean the drive wheel
and the rubber on the friction
wheel; they must be free of grease.
• If necessary remove ice on parts
which are iced over.
Adjusting the shift lever
(STH 8.66, STH 10.66 C)
Figure 12
• Remove spring clip (4) and washer
(5), extract spindle
nut (6) from the hole (7).
• Press gearshift arm (2) down-
wards, set shift lever (3) to gear
“6”.
• Rotate spindle nut (6) in such
a way that the pin can be put into
the same hole (7).
• Secure spindle nut with washer
and spring clip.
!