WHEEL
ROTATION
All CUBE fans
have CW wheel
rotation when
viewed from top
of fan.
WHEEL
OVERLAP
DIMENSIONS
G
Fig. 2
Fig. 3
Fig. 4
Fig. 6
Fig. 5
Clockwise
Direction of wheel rotation is critical. Reversed rotation will result in poor air performance, motor overloading and possible
burnout. Check wheel rotation (viewing from the shaft side) by momentarily energizing the unit. Rotation should be clockwise
as shown in Fig. 3 and correspond to the rotation decal on the unit.
If adjustments are made, it is very important to check the pulleys for proper alignment. Misaligned pulleys lead to excessive
belt wear, vibration, noise and power loss. (See Fig. 4 )
For all CUBE units belt tension can be adjusted by loosening four fasteners (marked “R”) on the drive frame. The motor plate
slides on the slotted adjusting arms and drive frame angles in the same manner (see Fig. 5). Belt tension should be adjusted
to allow 1/64 inch of deflection per inch of belt span. For example, a 15 inch belt span should have 15/64 inch (or about 1/4
inch) of deflection with moderate thumb pressure at mid-point between pulleys. (See Fig. 6). Overtightening will cause
excessive bearing wear and noise. Too little tension will cause slippage at startup and uneven wear.
The adjustable motor pulley is factory set for the RPM specified. Speed can be increased by closing or decreased by opening
the adjustable motor sheave. Two groove variable pitch pulleys must be adjusted an equal number of turns open or closed.
Any increase in speed represents a substantial increase in the horsepower required by a unit. Motor amperage should always
be checked to avoid serious damage to the motor when speed is varied.
CORRECT
WRONG
WRONG
WRONG
Belt Span
Deflection =
Belt Span
64
NOTE:
Identical fasteners
on opposing side
R
2
Pre-Starting Checks
Check all fasteners for tightness. The wheel should rotate freely and be aligned as shown in Fig. 2. Wheel position is preset
and the unit is test run at the factory. Movement may occur during shipment, and realignment may be necessary. Centering
can be accomplished by loosening the bolts holding the drive frame to the shock mounts and repositioning the drive frame.
Wheel and inlet cone overlap can be adjusted by loosening the set screws in the wheel and moving the wheel to the desired
position.
MODEL
G
098-161
1/4 in.
180-300
1/2 in.
360-480
3/4 in.
