Gorman-Rupp Pumps 13C20-B 710764 and up - Manual (Page 16)

10 SERIES OM-00641
PAGE B - 9 INSTALLATION
Figure 4B. Alignment of V‐Belt Driven Pumps
Check parallel adjustment by laying a straightedge
across both coupling rims at the top, bottom, and
side. When the straightedge rests evenly on both
halves of the coupling, the coupling is in horizontal
parallel alignment. If the coupling is misaligned,
use a feeler gauge between the coupling and the
straightedge to measure the amount of misalign­
ment.
V‐Belt Drives
When using V‐belt drives, the power source and
the pump must be parallel. Use a straightedge
along the sides of the pulleys to ensure that the pul­
leys are properly aligned (see Figure 4C). In drive
systems using two or more belts, make certain that
the belts are a matched set; unmatched sets will
cause accelerated belt wear.
MISALIGNED:
SHAFTS
NOT PARALLEL
MISALIGNED:
SHAFTS
NOT IN LINE
ALIGNED: SHAFTS
PARALLEL AND
SHEAVES IN LINE
Figure 4C. Alignment of V‐Belt Driven Pumps
Tighten the belts in accordance with the belt manu­
facturer's instructions. If the belts are too loose,
they will slip; if the belts are too tight, there will be
excessive power loss and possible bearing failure.
Select pulleys that will match the proper speed ra­
tio; overspeeding the pump may damage both
pump and power source.
Do not operate the pump without the
guard in place over the rotating parts.
Exposed rotating parts can catch cloth­
ing, fingers, or tools, causing severe in­
jury to personnel.
V‐BELT TENSIONING
General Rules of Tensioning
For new V‐belts, check the tension after 5, 20 and
50 hours of operation and re‐tension as required
(see the following procedure for measuring belt
tension). Thereafter, check and re‐tension if re­
quired monthly or at 500 hour intervals, whichever
comes first.
Ideal V‐belt tension is the lowest tension at which
the belt will not slip under peak load conditions. Do
not over‐tension V‐belts. Over‐tensioning will short­
en both V‐belt and bearing life. Under‐tensioning
will cause belt slippage. Always keep belts free