30
Belt Adjustment (SUC 300)
Check V-belt tension regularly, especially when they are new. New
V-belts normally require adjustment after 15 minutes and again after
2-3 hours work.
Belt tension check
To inspect the V-belts remove the belt guard. Use, for instance, a
tension tester to check the belts.
Order No.: 121 130 071.
Check the tension of all the belts. If it is not possible to adjust one
set of belts so that all the belts have the proper tension the whole set
must be replaced.
»The 4 belts«: Depress one of the belts. At a deflection of 3/8 in
(9.5 mm), the force should be between 3.3 - 5.5 lb (1.5 - 2.5 kg).
»The 5 belts«: Depress one of the belts. At a deflection of 1/4 in
(6 mm), the force should be between 6.6 - 9.9 lb (3 - 4.5 kg).
The belt of the rotary valve: Depress the belt. At a deflection of 5/16 in
(7.5 mm), the force should be between 3.3 - 4.4 lb (1.5 - 2 kg).
If the belts are too tight both the bearings and the belts will be overlo
-
aded and their life considerably reduced.
If the belts are too slack they will slide on the belt pulleys and wear
quickly. At the same time the blower will run too slowly reducing con
-
veying capacity.
How to use the tension meter
1. Position the lower rubber ring at the deflection distance on the
lower scale. Leave the upper rubber ring against the edge of the
sleeve.
2. At center of span length apply force, with tension tester perpendi
-
cular to span, large enough to make the deflection distance corre
-
spond to the edge of the adjacent belt. A straight edge across the
belts will insure accuracy of reading.
3.
Remove the tension tester and read the deflection force on upper
scale, at the top edge of the rubber ring.
4. If the force is too high, belts should be slackened, and if the force
is too low, belts should be tightened.
Tightening of belts
First loosen the belt of the rotary valve by means of tightening bolt (C)
and »the 5 belts« of the blower by means of tightening bolt (A).
Then tighten the belts in the following order:
1. Tighten »the 4 belts« of the blower by means of tightening bolt (B).
2. Tighten »the 5 belts« of the blower by means of tightening bolt (A).
3. Tighten the belt of the rotary valve by means of tightening bolt (C).
Remount the belt guards before starting the blower.
3.3-5.5 lb
6.6-9.9 lb
3.3-4.4 lb
3/8 in
1/4 in
5/16 in
