Fig. 4 - Drawing of the blower and motor assembly showing the "span"
Measure the distance, in inches, between shaft centers. This distance is referred to as the "span".
Loosen the motor mounting bolts to allow movement of the motor assembly.
Using a spring scale or other suitable device, apply the appropriate force (as given in Table 1) to the belt. This
force should be applied at the center of, and perpendicular to, the span and be directed toward the center of the
Adjust the drive, using the adjustment screws on the motor assembly, until the belt is deflected 1/64 Inch for
every inch of span length.
Tighten securely all motor mounting bolts. Ensure that the shafts are parallel and that the faces of the sheaves
are In the same plane.
H. Replace the belt guard.
11. Install the filter, silencer, or combination filter-silencer If used Blowers are normally purchased with these accessories.
However, any of these accessories may be purchased separately. To properly Install the unit, accomplish the
Dip the new filter in oil and allow it to drain thoroughly. Use SAE 10-30 oil when ambient temperatures are below
700 F and SAE 30-50 oil when temperatures are above 700 F.
Bolt the accessory to the inlet flange of the blower. These accessories are designed to be attached by an eight-
stud flange (ten-stud flange for the 18" model). In some cases, four additional holes must be drilled in the inlet
flange to accommodate these studs. When drilling, ensure that the blower casing Is not damaged.
Properly position the accessorys supporting leg (Hauck supplied if required) Do not allow the entire weight of
these accessories to be supported by the flange of the blower casing.
Never run the blower without either a discharge or an inlet restriction. If run wide open at both inlet and outlet, the motor
will be severely overloaded and probably damaged.
Always check the direction of impeller rotation at first start-up and after all wiring changes.
Before starting the blower for the first time, the impeller should be rotated to be sure there are no restrictions to Its free
turning Ensure that the three setscrews on the Impeller hub are tight. RUN THE BLOWER FOR 15 MINUTES, then
recheck the setscrews AFTER ONE WEEK OF OPERATION, recheck the setscrews and tighten if necessary. Thereafter,
periodically check the setscrews. (Refer to Maintenance Section )
Never expose the belts of belt-driven models to temperatures in excess of 140° F.