MK Plastics Axijet IO&M - Manual (Page 7)

Pulley Alignment
Pulley alignment is adjusted by loosening the motor pulley setscrew and by moving the motor pulley on the motor
shaft, or by moving the entire motor along the motor mounting bracket. Fig. 12 illustrates correct and incorrect pulley
alignment.
A recommended method of inspecting the pulley alignment is shown in Fig. 13. With the shorter leg of a carpenter’s
square or other straight edge lying along the case of the motor, adjust the position of the motor pulley (or the motor)
until the longer leg of the square is parallel to the belt.
Fig. 12 – Pulley Alignment
Fig. 13 – Pulley Alignment Method
Belt and Pulley Installation
Belt tension is determined by the sound the belts make when the fan is first started. Belts will produce a loud squeal,
which dissipates after the fan is operating at full capacity. If the belt tension is too tight or too loose, lost efficiency
and possible damage can occur. Do not change the pulley pitch diameter to change tension. This will result in a
different fan speed than desired.
1. Loosen motor plate adjustment nuts on L-bolts and move motor plate in order that the belts can easily
slip into the grooves on the pulleys. Never pry, roll, or force the belts over the rim of the pulley.
2. Slide the motor plate back until proper tension is reached. For proper tension a deflection of approxi-
mately ¼” per foot of center distance should be obtained by firmly pressing the belt. Refer to Fig. 11.
3. Lock the motor plate adjustment nuts in place.
4. Ensure pulleys are properly aligned. Refer to Fig. 12
Page 7
Fig. 11 – Belt & Pulley Tension