36
performance for specific combinations of
motor horsepower and system pressure
requirements. Initial belt tensioning will
rapidly drop off during the first fifty to one
hundred hours of compressor operation.
Therefore, belt tension should be monitored
daily during this period to minimize belt wear.
A belt that is too loose will slip, causing
excessive heat and accelerated wear. Belts
that are too tight will cause an overload
condition on motor and/or compressor
bearings.
BELT INSTALLATION AND ADJUSTMENT
When installing new belts, do not pry the
belts over the pulley grooves. The proper
installation method follows:
1. Disconnect and lock out all electrical
power to the compressor.
2. Remove the front panel to allow access
to the belt drive and remove the front
belt guard.
3. Loosen and remove the nut from the
threaded rod on the spring tensioning
belt adjustment device, located next to
airend on the airend mounting plate.
4. Push motor over toward the airend,
allowing the complete assembly to pivot
on the base. Remove the old belts.
5. Install new belts. Tilt motor assembly
back away from airend as far as
possible. Reinstall nut and washer on
threaded rod and tighten until the bottom
of the spring cover is within 1/8” - 1/4”
from the pivoting airend mounting base.
Check belt tension to make sure tension
is correct. Loosen or tighten nut to
compress spring as required.
6. Restore electrical power and restart the
compressor to check correct tracking of
the belts.
7. Replace the front belt guard and front
panel.
PULLEY ALIGNMENT
Realignment of pulleys is not required during
normal belt service, however, if pulleys, motor
or airend positions are changed realignment
of pulleys should be done by following
method.
FIGURE 15
Check the pulley alignment by placing a
straight edge against the side of the drive
pulleys and measure to the edge of the belts
at points A and B. If these two
measurements are the same, the pulleys are
correctly aligned.
If these two measurements are not the same,
reposition the pulleys to obtain correct
alignment.
FIGURE 16
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