CaptiveAire D76 - Pulley and Belt Adjustments

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Pulley Adjustment

The adjustable motor pulley is factory set for the RPM specified (Table 7). Speed can be increased by

closing or decreased by opening the adjustable motor sheave. Two groove variable pitch pulleys must be

adjusted to an equal number of turns open or closed. Any increase in speed represents a substantial

increase in horsepower required by the unit. Motor amperage should always be checked to avoid serious

damage to the motor when the speed is varied. Always torque set screws according to the torque

specifications shown in Figure 17.

Figure 17 - Adjustable Pulley

Table 7 - Maximum RPM and HP Chart

Blower Size Maximum RPM Maximum HP

7” 2400 2

Decrease Amperage

and

Blower RPM

Setscrew Thread Size Torque (in-lbs)

No. 10 (bushing) 32

1/4” (bushing) 72

5/16” 130