NORD Drivesystems Berges-VG - Manual (Page 25)

Removing the variable-speed and spring pulleys ( Figure14 )
ƒ The variable-speed and spring pulleys can be removed by removing the cheese-head
screw ( Item 6 ), the spring washer ( Item 8 ), the securing disc ( Item 5 ) and the
circlip (Item 7) from the bore. Place a smooth disc (Item 9 ) in front of the shaft stub
in order to protect the shaft thread, guide the attachment disc ( Item 5 ) the other
way around into the bore and press the circlip ( Item 7 ) back into the recess of the
bore. The variable-speed and spring pulley can now be removed from the shaft by
screwing in a hexagon - head screw ( Item 10 ). The thread in the securing disc
( Item 5 ) is always "one size" larger than the corresponding shaft thread.
Figure 14
Alignment ( Figure 15 )
ƒ The variable-speed pulley and spring pulley must be "precisely aligned" , the wide
V-belt may not "run skew". This extremely important precondition for proper ope-
ration of the drive is met if the stop shoulders of drive and output are aligned.( Owing
to permissible belt length tolerances, a slight correction may be necessary by fitting
corresponding spacer rings behind when changing the wide V-belt).
Figure 15
6.2.4 ƒ Changing the bearings
The bearings of the mechanical pulleys and gearbox flanges schould be replaced
if excessively noisy and certainly within 90% of a bearings theoretical life.
Pulley type / GFL
90%-theor.Lagerlebensdauer
Betriebsstunden
R080b - R300b 40.000
R350b - R400b 20.000
R500b - R600b 13.000
GFL 1 - GFL 7 10000*
*Values apply to maximum speeds, without talking into consideration the load applied by the customer.
6.2.5 ƒ General Maintenance
Regular cleaning must be carried out on the ventilation slots and the interior of the
variable speed gear to prevent the accomulation of dirt. The penetration of abrasive
dusts must be avoided.
25
Servicing