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POCKET CLIP
SLIDING
RUBBER O-RINGS
DEFLECTION
FORCE SCALE
(READ DOWN)
DEFLECTION
DISTANCE
SCALE
(READ UP)
Fig. 5-3 Belt Tension Gauge
Climate Control Series
2022209100, August 2018
Belt Alignment
Check the belt alignment by placing a straightedge
against the face of the flywheel, touching its rim at
two places (Refer to Fig. 5-1, Belt Alignment). Adjust
the motor pulley so that the belt runs parallel to the
straightedge. Use a wheel puller to move the motor
pulley on the shaft.
Belt Tension
Set belt tension using the following instructions:
Step 1) Measure the span length of the drive. (Refer
to Fig. 5-2, Setting Belt Tension.)
Step 2) Determine the amount of deflection ( in inches)
required to measure deflection force (in pounds) by
multiplying the span length x
length x
measure deflection force).
Step 3) Lay a straightedge across the top outer surface
of a drive belt from pulley to pulley.
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. 5-3, 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 below. The deflection
force reading should be within the minimum and maximum values
shown. Adjust belt(s) accordingly. 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).
Belt
Motor Pulley
Cross
Dia. Range
Section
(inches)
up to 3.0
A
3.1 - 4.0
4.1 - 5.0
5.1 + above
up to 4.6
B
4.7 - 5.6
5.7 - 7.0
7.1 + above
30
/64 [.016] =
/2" [.50] of deflection required to
1
1
Recommended
Deflection Force (lbs.)
Initial Install.
Minimum
3.6
2.4
4.2
2.8
5.2
3.5
6.1
4.1
7.3
4.9
8.7
5.8
9.3
6.2
10.0
6.8
/64 (.016) (i.e. 32" span
1
Maximum
3.1
3.6
4.6
5.3
6.4
7.5
8.1
8.8
Quincy Compressor
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