Service
-36-
For Machines Mfd. Since 10/20
South Bend Tools
Model SB1093
S E R V I C E
Tensioning/Replacing
V-Belt
Maintaining proper V-belt tension is critical
when it comes to machine operation. A belt that
is too loose will result in excess heat, slippage
and premature wear of the belt and pulleys. Too
much tension can cause excess wear on the belt
as well as damage to the bearings, and shafts.
Note:
After the first 16 hours of operation with a
new belt, check and re-tension the drive belt, as it
may stretch and seat during this time, which will
cause it to lose the initial tension that you set.
Checking V-Belt Tension
Tools Needed
Qty
Wrench 10mm, 17mm ...........................................1
1.
DISCONNECT MACHINE FROM POWER!
2.
Open rear access door.
3.
Check V-belt tension by applying moderate
pressure approximately mid-way between
pulleys (see
Figure 63
).
— If V-belt deflection
is
approximately
3
⁄
4
", belt is correctly tensioned and no
adjustment is necessary.
— If deflection
is not
approximately
3
⁄
4
",
V-belt is not correctly tensioned. Follow
steps to loosen or tighten V-belt.
1.
Loosen bottom nut on belt tensioning bolt
(see
Figure 64
).
1.
Loosen top nut on belt tensioning bolt (see
Figure 64
).
Note:
Motor will raise with the tension of
the belt. Check tension every couple of turns
until proper tension is achieved. An under-
tensioned belt may cause excessive heat and
premature belt and pulley wear.
2.
Tighten both nuts against motor mounting
plate.
2.
Turn top nut clockwise to lower motor.
Note:
Check belt tension every couple of turns
until proper tension is achieved.
DO NOT
over tighten belt. An over-tightened belt will
cause the belt to wear prematurely and will
also increase wear on the pulleys, shafts, and
bearings.
3.
Tighten both nuts against motor mounting
plate.
Figure 63. Proper belt tension.
Disc
Pulley
Approximately
3
⁄
4
" Deflection
Motor
Pulley
!
Figure 64. Drive belt tensioning bolt.
Belt Tensioning Bolt
!
Motor Mounting Plate
Tightening V-belt
Loosening V-Belt
