Vari BDR-620, Руководство пользователя, Страница: 21 / 59

BDR-620 , BDR-620B
 Pay special attention when dismounting the blades. The cutting blades are sharp. Protect your hands with work gloves.
 The engine must be off and the end of the spark plug cable must be taken off!
Proceedings (at the Pict . 5 ):
1) Hold the upper disc (1) so that it does not spin and use tubular wrench n.16 to dismount the bolted connection (3,4,5,6) of the blade. First unscrew the
nut (6), than the bolt.
2) Take the blade (2) and its parts out of the cutting disc. Align the blades and sharpen them. The blade slope should hold 30º angle with the bottom blade
level.
3) Check all blade parts for visible marks of damage. In case of damage, exchange the part with a new one.
4) Tighten the blade seating back. Tighten the bolt (3) firmly 52 . Secure the bolt from loosening with a nut (6).

If some of the blades are bended or deteriorated you must exchange all cutting disc blades!
2.5.4 Belt transmission – automatic brake
The cutter is equipped with modern belts that do not require special care. It is only necessary to control them regularly and exchange them should you see
cracks or breaks on their surface. It is necessary to check on the tightening pulleys setting after the first 5 hours of operation, as the belt is being run-in. It is
necessary to check the tightening pulleys function during the running-up, in order to prevent belt damage caused by insufficient tension when the belt extends. It is
also important to check the function of the automatic disc brake during the running-up.
The correct belt transmission function is easy to check:
a) Turn on the wheel drive and let the cutter deal with a 10 cm terrain obstacle – e.g. a kerb.
b) The engine stalls when you press the wheel drive clutch quickly. The belt already starts to grip (the disc starts spinning) in just 1/3 step of
the wheel drive clutch lever.
If you had problems with at least one of these, the tightening pulleys need adjustment.
2.5.4.1 Tightening pulleys adjustment
 Seek authorised service in case you lack appropriate manual skills.
First: Dismantle the top plastic cover, so that you can see both belts ( Pict.10 ) securing the forward movement of the machine . Try again to overcome terrain
irregularities and visually check belt slipping.
1) If the belt slipping occurs on the right side of the cutter , tighten it by unscrewing the bolt (3) at the cable 53 terminal in the direction of the arrow
(away from the frame) for approximately 1mm, and repeat the visual check as in a). Continue tightening until condition a) is met and at the same time
the cutter start moving forward while wheel drive clutch lever is loose. If the bolt (3) cannot be unscrewed any further, screw it in completely against
the direction of the arrow and hook the spring at the end of the cable into a further opening in the pulley arm. Repeat tightening the belt until condition
a) is met.
2) If there is belt slipping between the engine and gearbox , dtighten it with the tightening pulley (4). Loosen the pulley by loosening the nut placed
below the pulley. Use an appropriate tool (e.g. steel hook) to tighten the pulley in the direction of the arrow and tighten the nut while the pulley is
stretched. Then check the right function of the wheel drive.
In case the tightening pulleys cannot be adjusted to prevent belt slipping, it is necessary to exchange the belt.
Second: Dismount the front plastic cover so that you can see the belt and disc drive pulley ( Pict.11 ). ( Marking (1) a (2) in pictures 10 and 11 are the same and
belong to the same cable. )
1) Tighten the belt by unscrewing the bolt
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(1) in Pict.10 for approximately 1 mm in the direction of the arrow (away from the frame) and repeat the
check according to b). Continue tightening until condition b) is met and at the same time the belt transmission grip
55
stops while wheel drive clutch
lever is loose. If the bolt (1) cannot be unscrewed any further, screw it in completely against the direction of the arrow and hook the spring at the end of
the cable into a further opening in the pulley arm. Repeat tightening the belt until condition b) is met.

Check the automatic brake function after every adjustment!
2.5.4.1.1 V-belt exchange
Exchange the V-belt with a new one 56 every time you see cracks or breaks in its surface, or when it is so deteriorated that it cannot be tightened with the
tightening pulleys. Exact instructions for belt exchange are not included here, as their contents exceed the limitations of this manual. When exchanging the belt,
follow
Pict.13 . Follow belt track around all guide elements!
 Seek authorised service in case you lack appropriate manual skills.
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2.5.4.2 Brake function control and adjustment
Check the automatic brake function after every 10 hours of use. (Current control can be done during operation.) Every time you release the disk
drive clutch lever, the automatic brake must stop the disc within 5 sec.
 Do not continue working with the cutter unless you remove the automatic brake defect.
3
 Seek authorised service in case you lack appropriate manual skills.
52 Insufficient bolt tightening usually destroys the hardened washer around which the blades spin.
53 You may also use the bolt attached to handlebar rail on the other side of the cable. In this case, screw the bolt in the direction away from the rail.
54 You may also use the bolt attached to handlebar rail on the other side of the cable. In this case, screw the bolt in the direction away from the rail.
55 Manifests itself by chattering and irregular belt grip.
56 Use V-belts recommended by the manufacturer only. Proper transmission function cannot be guaranteed when using other V-belts.
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