-38-
For Machines Mfd. Since 12/20
South Bend Tools
Model SB1108/SB1109
S E R V I C E
Tensioning/Replacing
V-Belts
Three V-belts transfer power from the motor
to the cutterhead, and then to the infeed and
outfeed rollers with the use of the drive chain
system. To ensure efficient transfer of power to
these systems, make sure the V-belts are always
properly tensioned and in good condition.
If the V-belts are worn, cracked, or damaged,
replace them. Always replace all V-belts at the
same time with a matched set of three, or belt
tension may not be even among the belts, causing
premature belt failure or weakened power
transfer.
V-belts and pulleys will be hot after operation.
Allow them to cool before handling.
Items Needed
Qty
Phillips Screwdriver #2 ........................................1
Open-End Wrench 19mm .....................................1
1.
DISCONNECT MACHINE FROM POWER!
2.
Remove V-belt cover from left side of
machine to expose belts (see Figure 47).
Note:
A collection of black belt dust at the
bottom of the belt cover is normal during the
life of the belts.
To tension/replace V-belts:
Disc
Pulley
Approximately
3
⁄
4
" Deflection
Motor
Pulley
Figure 49. Checking belt deflection.
3.
Remove rear cabinet cover to access motor
mount hex nuts (see Figure 48).
Note:
SB1108 has (1) motor mount
connecting rod, SB1109 has (2).
4.
If V-belts need to be replaced, raise motor
to release belt tension, roll them off pulleys,
then replace with a matched set of three.
5.
To adjust V- belt tension, loosen top motor
mount hex nuts (see Figure 48), then adjust
bottom hex nuts to raise or lower motor.
Note:
V-belts are properly tensioned when
there is approximately
3
⁄
4
" deflection when
moderate pressure is applied to them midway
between pulleys, as illustrated in Figure 49.
6.
After V-belts are properly tensioned, tighten
top motor mount hex nuts, then re-install
cabinet cover and belt cover.
Figure 48. Motor mount hex nuts.
Motor Mount
Hex Nuts
!
Motor Mount
Connecting Rod
Figure 47. V-belts and pulleys.
V-Belts
Cutterhead
Pulley
Motor
Pulley
!
