Mounting Of Pulleys; Disassembly Of Pulleys; Operation - WEG G truck Serie Manual De Instalación, Operación Y Mantenimiento

5.5 MOUNTING OF PULLEYS

To mount pulleys on shaft end with key slot and threaded
hole at the tip, the pulley must be inserted halfway in the
key slot only with manual pressure.
On shafts without threaded hole it is recommended to
heat the pulley to 80 °C.
Figure 5.5: Mounting of pulleys

5.6 DISASSEMBLY OF PULLEYS

For disassembly of pulleys, it is recommended to use the
devices as shown in the figure below, proceeding with care
not to damage the pin and the pulley seat.
Figure 5.6: Disassembly of pulleys
The use of hammers on belt pulleys must be avoided
thus avoiding the formation of marks on the bearing
races. These initially small marks increase with usage and
can develop to completely damage the bearing.
The correct positioning of a pulley is shown in Figure 5.7:
INCORRECT CORRECT
Figure 5.7: Positioning of the pulleys

5.7 OPERATION

Avoid unnecessary radial stress on the bearings by
positioning the shafts parallel to each other and the pulley
perfectly aligned, as Figure 5.8:
Belts that work diagonally convey impacts to the rotor
and may damage the bearing seat. Belt slippage can be
prevented by applying some resin such as pitch, for
example:
The belt tension must be just enough to prevent slippage
during operation, as Figure 5.9.
For all types of coupling the sleeves or pulleys used must
be properly balanced.
Avoid using too small pulleys; they cause bends in the
alternator because the tension increases in the belt as the
diameter of the pulley decreases.
INCORRECT
In each specific case of the pulley dimensioning, the
WEG sales dept. must be consulted to ensure correct
application.
10258257 – Installation, Operation and Maintenance Manual
www.weg.net
CORRECT
INCORRECT
INCORRECT
INCORRECT
Figure 5.8: Coupling by means of pulleys and belts
Figure 5.9
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