QR-25 Series
Quincy Compressor
52201-107, December 2012
26
3501 Wismann Lane, Quincy IL - 62305-3116
Pix 1152
Fig. 5-1
Setting Belt Tension
Belt
Motor Pulley
Recommended
Cross
Dia. Range
Deflection Force (lbs.)
Section
(inches)
Initial Install.
Minimum Maximum
up to 3.0
3.6
2.4
3.1
A
3.1 4.0
4.2
2.8
3.6
4.1 5.0
5.2
3.5
4.6
5.1 + above
6.1
4.1
5.3
up to 4.6
7.3
4.9
6.4
B
4.7 5.6
8.7
5.8
7.5
5.7 7.0
9.3
6.2
8.1
7.1 + above
10.0
6.8
8.8
Step 2)
Determine the amount of deflection ( in inches) required to mea
sure de flection force (in pounds) by multi plying the span length
x
1
/
64
(.016) (i.e. 32” span length x
1
/
64
[.016] =
1
/
2
”[.50] of deflection
required to measure de flection 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, perpendicu lar 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 prede
termined deflection (refer to Step 2 above). Record the reading
on the belt tension gauge and compare to the chart following Fig
5-1. The de flection force reading should be within the minimum
and maximum values shown. Adjust belt(s) accord ingly. New belts
should be tensioned to the values listed under “Initial Install”.
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
).
Summary of Contents for QR-25 210
Page 42: ......
