177
Motor and motor control
4741
B, C
A
Adjust drive belt tension if values exceed
those shown in the table.
10
11
Adjustments
Drive belt tension
The drive belt is pre-tensioned upon delivery
from the factory.
The drive belt tension should be as follows:
Model Force A Post tensioning B New belt C
(N) inch (mm) inch (mm)
SU620 35 3/8" (9) 5/16" (8)
SU630 50 3/8" (9) 5/16" (8)
SU645 75 1/2" (12) 3/8" (9)
SU660 83 1/2" (12) 3/8" (9)
SU677 105 7/16" (11) 3/8" (9)
To adjust drive belt tension, first undo the motor
retaining screw a couple of turns, then press
down on the motor to achieve proper tensioning.
Lock the locking nut when the tension is correct.
Then lock the retaining screw.
Inspection of the drive belt tension is an
important part of general maintenance.
10
11
5466
Retaining screw for drive belt tension
Locking nut
Adjusting screw
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