Gorman-Rupp Pumps VS3A60-B 1368380 and up - Manual (Page 15)

OM-06012 ULTRA V SERIES
PAGE B - 8 INSTALLATION
Figure 5 shows a recommended alternate single
motor belt drive arrangement where the both
pump shafts are driven by separate drive belts con­
nected to one motor. In this arrangement, shaft
and/or bearing loads are evenly divided between
the two pumps.
Figure 5. Alternate Single Motor Belt Drive
Arrangement
Single Motor Combination Drives
In staged applications where both pumps are driv­
en by a single motor in a combination belt and cou­
pling drive configuration, certain arrangements
must be used in order to ensure proper operation.
Figure 6 shows a recommended alternate single
motor combination drive arrangement, where
the first stage pump shaft is direct‐coupled to the
motor and the second stage pump shaft is driven
by belts and an idler located between the two
shafts. In this arrangement, shaft and/or bearing
loads are shared between the two pumps.
Figure 6. Alternate Single Motor Combination
Drive Arrangement
Figures 7 and 8 show single motor belt drive ar­
rangements that are not recommended because
they can cause an overload condition on the shaft
and/or bearings, resulting in premature failure.
Figure 7. Improper Single Motor Belt Drive
Arrangement (Dual Belts)