Vari BDR-620B, User Manual, Page: 21 / 60

Lucina MaX
Speeds are changed by moving the V-belt on the pulleys between the gearbox and the drive axle (see
Pict.23
and
Pict.24
). A sticker
is glued on the top gearbox cover with a picture of the belt positions in the pulleys on the gear box and the drive axle.

The engine must always be off and the gas lever in the STOP position when the speeds are changed!
Procedure:
1) Loosen the plastic nut 51 ( 3 on
Pict. 10
), tilt out the upper gearbox cover 1 in the direction of the arrow and pull it out
diagonally backwards. Push in the foot 4 of the lower gearbox cover 2 , located in the middle of the rear section of the
frame until the cover releases and pops out of the frame tab 4 .
2) Slide the whole V-belt of the pulley on the axle towards the left wheel. Subsequently then slide the V-belt from the pulley on the
gearbox towards the right wheel.
3) Move the V-belt into the pulley groove on the axle that corresponds to the selected transfer ratio. Check visually and by touch if
the V-belt sits properly in the groove on the selected pulley.
4) Move the V-belt into the pulley groove on the axle that corresponds to the selected transfer ratio. Check visually if the V-belt sits
in the correct pulleys according to the selected transfer ratio (see
Pict23
. and
Pict.24
). The V-belt must not cross!
5) Reinstall both of the covers. Place the upper plastic cover under the engine plate, close it, and tighten the plastic nut. Bend the
bottom plastic cover upwards and place the opening into the
foot 4 of the cover on the frame tab. Loosen the deflection of the
cover, and the cover will sink into place.
2.4.3 Working with the machine
2.4.3.1 Cutting width

Always adjust the cutting width to the stand density!
It is not recommended to use the maximum cutting width (
Table 4
) given by the disc construction. In a terrain, the user cannot
operate the cutter straight, and precisely enough to cut the brushes in complete cutting width. We recommend to use the cutter partially
(approximately 5-10 cm from the edge of the front cover) in the cut stand (as shown in
Pict.5
from the user’s point of view).
2.4.3.2 Methods of stand cutting

Remove any solid parts form the stand before cutting (such as stones, wires, loose construction leftovers, etc.),
as these could be thrown away or damage the machine. If these cannot be removed, avoid them.
It is necessary to keep the lower disc sliding across the land without bouncing off when cutting in uneven terrain. Disc bouncing causes
low quality stand cutting and uneven stubble.
Let the engine and cutting disc spin in their maximum rpm, and start moving against the stand you wish to cut. The cutting disc throws
cut stand onto the right side, where it is windrowed by the side screen.
➢
Always keep the cut brush on the left side form the machine when cutting ( Pict.5 ).
➢
When cutting on slopes it is best to move along the slope contour line. Keep the safe climbing ability (
Table 4
)!
In case the cut stand is too dense, inter grown, rotten, or flattened, it is necessary to adjust the machine cutting width, so that the
cutting disc rpm would not be too low, and thus causing low cutting quality.
2.4.3.2.1 Cutting problems

Be especially careful when lifting and reversing the machine!

Always turn the engine off when cleaning the space under the top cover!

Always tip the machine backwards on its handlebars only. Always be especially careful when moving in the space
under a lifted machine. Secure the cutter from spontaneous movement!

Always be especially careful when cleaning the space under the top cover. The cutting blades are sharp. Use work
gloves, or other convenient objects, e.g. a piece of branch, for cleaning the machine.

Before continuing any activity on the machine or its surroundings, always wait until the cutting disc stops.
1. The cutting disc and the engine rpm are both slowing down, but the engine does not stall.
➢
Stop the machine immediately, reverse slightly while lifting the front of the machine a bit (by pressing the handlebars
down). The space under the top cover partially cleans itself from extensive amounts of grass mass. Start moving against
the stand again.
2. Cutting disk stopped spinning, the engine staled.
➢
Release both handlebars levers and lift the cutter by pressing the handlebars. Move the cutter slightly backwards. Clean
the space under the top cover, and spread the cut grass across the surface. Start the engine, turn the cutting disc drive
on, and start moving against the stand again.
3. The cut brushes keeps catching on the side screen (because the stand is too thick).
51 Loosen the plastic nut by about 1 to 2 turns. The cover contains a groove that enables removal of the cover without the need of unscrewing the plastic nut.
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