QR-25 Series
Quincy Compressor
52201-105, May 2003
24
3501 Wismann Lane, Quincy IL - 62305-3116
Belt
Motor Pulley
Recommended
Cross
Dia. Range
Deflection Force (lbs.)
Section
(inches)
Minimum
Maximum
3.0 - 3.2
2.3
3.2
A
3.4 - 3.6
2.5
3.6
3.8 - 4.2
2.9
4.2
4.6 - 7.0
3.5
5.1
4.6
4.0
5.9
B
5.0 - 5.4
4.5
6.7
5.6 - 6.4
5.0
7.4
6.8 - 9.4
5.8
8.6
Step 2)
Determine the amount of deflection ( in inches) required to mea-
sure deflection force (in pounds) by multiplying the span length x
1
/
64
(.016) (i.e. 32” span length x
1
/
64
[.016] =
1
/
2
”[.50] of deflection
required to measure deflection force).
Step 3)
Lay a straightedge across the top outer surface of a drive belt from
pulley to sheave.
Step 4)
At the center of the span, perpendicular to the belt, apply pressure
to the outer surface of the belt with a belt tension gauge (refer to
Fig. 5-2, Belt Tension Gauge
). Force the belt to the predeter-
mined deflection (refer to
Step 2
above). Record the reading on the
belt tension gauge and compare to the chart following
Fig 5-1
. The
deflection force reading should be within the minimum and maxi-
mum values shown. Adjust belt(s) accordingly. New belts should
be initially tensioned to the maximum value plus 33% (multiply by
1.33).
Step 5)
Recheck the tension of the new belts several times in the first 50
hours of operation and adjust if necessary. Thereafter, check belt
tension on a regular basis (refer to
SECTION 5,
Maintenance
Schedule
).
Pix 1152
Fig. 5-1
Setting Belt Tension
Содержание QR-25 Series
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