Valex TST5136, Instruction Manual And Safety Instructions, Page: 15 / 16

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ROUTINE AND PERIODIC MAINTENANCE
Component When What to do
Lawnmower
and blade
After each use •Remove earth and grass using a small
wooden stick and a plastic brush.
•Check that there are no breaks, deforma-
tions, cracks, bending, crushing, wear or rust.
•Check the state of wear of the blade, its
sharpness and its balance. Sharpen or
replace if necessary.
Grass col-
lection box
After each use Remove earth and grass, do not use sharp
objects. If necessary, wash with water and
dry thoroughly.
Control levers
and handle
After each use Clean the dirt off the handles, and thorou-
ghly wipe traces of oil, petrol or dampness.
Engine After each use •Using a brush, clean the cooling fins.
•Keep all air vents in the engine clean and
unobstructed.
Fuel pipes After each use •Check that there are no cuts or cracks.
•Check that there are no fuel leaks. If
necessary, have the pipes replaced by an
authorised service centre.
•The fuel filter, where fitted, is located along
the fuel line, between the tank and carbu-
rettor. Check and clean at least every three
tank fills, or in case the engine malfunctions.
Air filter Clean every 50
hours of use.
Replace every
100 hours of use.
In case of use
in dusty are-
as, clean and
replace parts
more often.
1. Open the filter box cover (fig.N2 pos.23).
2. Remove the filter element.
3. Gently knock it against a surface so the
dirt comes off.
4. Reassemble the filter and its cover.
Spark plug Clean every 25
hours of use .
Replace every
100 hours of
use. For the
s p a r k p l u g
type, check
the technical
specifications
in the manual.
1. Disconnect the spark plug cap and
unscrew the spark plug with the correct
spanner (fig.F pos.19-20).
2. Check the spark plug and in case of
carbon residue remove with a metal brush
(not included). Replace the spark plug if
the electrode is excessively worn or the
insulation is damaged.
3. Measure the distance between the
electrodes using a thickness gauge (not
included) cross-checking with the value
indicated in fig. F; adjust if necessary.
4. Screw the spark plug by hand.
5. Secure a used spark plug with around
¼ turn of the spanner, and a new one with
around ½ turn of the spanner.
Engine oil
level check
Before each
use
Do a level check and top up as indicated in
the chapter “Internal combustion engine”.
Replacing
the engine
oil
Change the oil
after the first
month or after
the first 20 hours
of use. Then
change it every
12 months or
every 80 hours
of operation.
•The engine oil change must be done by
an authorised service centre.
•The used oil should be disposed of at
collection and disposal centres.
G e n e r a l
check-up
E v e r y 1 2
months or eve-
ry 80 hours of
use at the same
time as the en-
gine oil change.
Take the machine to an authorised service
centre for a general check-up.
SHARPENING AND REPLACING THE BLADE
!
WARNING! Each operation indicated below must be carried out
while the engine is off, the blade stopped, the spark plug cap di-
sconnected and the fuel tank empty. Always wear protective gloves.
! WARNING! The assembly of the blade must be carried out with
absolute precision. Incorrect assembly causes danger.
If you have to replace the blade because of its poor condition, only
use original spare parts of equal size and shape.
Before you start, carefully study the components and figure M. If you
are not familiar with handling and assembling mechanical compo-
nents, we recommend that you contact an authorised service centre.
Avoid turning the blade by hand as it is directly connected to the piston
and may compress the engine combustion chamber.
1. Wear protective gloves.
2. Fig. M1: Disconnect the spark plug cap (pos. 20) from the spark
plug (pos. 19) to prevent suddenly starting the machine, and empty
the tank.
4. Fig. M2: Tilt the lawnmower as shown in the figure to gain access
under the machine (tank cap and carburettor will be in the upper
part). Secure the position with straps to prevent the machine from
falling on you.
5. Fig. M3: Use one hand to hold the blade (pos. 26) away from the
cutting area, and using a socket hex key, unscrew the screw (pos.
27). Remove the washer (pos. 28) and remove the blade.
6. Fig. M4: Sharpen the two cutting edges of the blade, while retaining
the cutting angle.
7. Fig. M5: Check the balancing of the blade; if necessary, sharpen
one of the cutting edges more in order to counterbalance.
8. Fig. M6: Reinstall the blade on the end of the engine shaft (pay
attention to the positioning pins and the respective holes on the
blade); the cutting edge must face the soil. Insert the washer and
tighten the screw with a tightening torque of 30 Nm.
9. Visually check that the blade is correctly assembled.
10. Return the lawnmower to a horizontal position and start the engine
to carry out a dry test run for 30 seconds.
ADJUSTING THE DRIVE CONTROL (fig. R)
(FOR LAWNMOWERS WITH DRIVE)
The forward clutch lever (where fitted, pos. 3) is already adjusted du-
ring assembly, however, with machine use and normal wear of some
components, the drive could slip, and hence not transmit sufficient
power to the wheels and wear the belt.
To restore drive to the wheels, it is necessary to adjust the control
cable using the screw cable tensioner (pos. 38):
1. Loosen the nut.
2. Unscrew the cable tensioner as needed, as shown in figure R
3. Check that the lever has some initial clearance and that when fully
pressed it activates drive in the rear wheels.
4. Screw the nut tightly to lock the position of the cable tensioner.
WASHING THE CASING INTERIOR (fig. S)
This operation is only possible if the water fitting is present (pos. 39)
on the lawnmower casing.
1. Place the lawnmower on a flat and clean surface (no pebbles or
sand), such as a cement floor or the like.
2. Adjust the cutting height to minimum
3. Empty the grass collection box and install in on the lawnmower
4. Connect the fitting of a water pipe (not included) to the fitting on
the lawnmower (pos. 39) and open the tap
5. Pay attention because the floor will get wet and you may slip
6. Start the lawnmower and, standing still, keep it on for a few minutes
(the length of time depends on the amount of dirt and whether the
dirt is dry)
7. Turn the lawnmower off, close the water tap and disconnect the pipe
8. Unhook the grass collection box and empty out the dirt, then wash
it out with water
9. Using a cloth, dry the lawnmower and grass collection box. If the
grass collection box is in fabric, let it dry thoroughly before reusing it.