Specifications

Pro-Series
17
Note:Note:
Note:Note:
Note: Turn belt inside out (as shown above) to ensure
easy assembly and disassembly.
Measuring the Belt
• Pull belt tight around sheaves to check hand tight length,
overlapping the last two tabs with two holes in matching
links as shown in Figure 14.
• Count the number of links and remove one link for
every 24 of O/3L, A/4L and B/5L sections and one link
for every 20 of C section.
This gives the correct installed belt length and will en-
sure optimum belt tension when running. Note: Every
tenth link is designated with an arrow.
For multiple belt drives, ensure that each belt has the
same number of links.
Figure 14.Figure 14.
Figure 14.Figure 14.
Figure 14.
Power Twist
®
Plus™ V-Belts
Fan Bearings (Pro-75 and Pro-90 only) – The fan bear-
ings for the Pro-75 and Pro-90 require lubrication at a regu-
lar interval. Hours of operation, temperature and sur-
rounding conditions will affect the lubrication frequency
required. Therefore, when applying grease, observe the
condition of the grease expelled from the bearings and
note the amount of grease used. Both observations will
suggest whether or not the lubrication schedule should be
increased or decreased. Start with an initial monthly inter-
val, and use a high quality NLGI No. 2, lithium soap grease
with petroleum oil.
Also note that all bearings are originally filled with grease
at the factory. When the fans are started, the bearings may
discharge excess grease though the seals for a short period
of time. If so, it is not necessary to replace this initial
discharge. Lubricate bearings prior to extended shutdown
or storage and rotate the shaft monthly to aid corrosion
protection.
Assembly
1. Hold belt with tabs
pointing outward.
2. Place end tab through
two links at once.
3. Flex belt further and
insert second tab through
end link by twisting tab
with thumb.
4. Ensure tab returns to
position across belt.
Reverse belt so tabs run
inside.
Disassembly
3. Rotate belt end with tab
90°.
4. Pull belt end through two
links.
1. Hold belt upside down.
Bend back as far as
possible: hold with one
hand. Twist one tab 90°
parallel with slot.
2. Pull end of link over tab.