Gorman-Rupp Pumps 83A52-B 1332148 and up - Manual (Page 14)

80 SERIES OM−00881
PAGE B − 8 INSTALLATION
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 8. 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.
DRIVE BELT TENSIONING
General Rules of Tensioning
For new drive belts, check the tension after 5, 20
and 50 hours of operation and re-tension as re-
quired (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 drive belt tension is the lowest tension at
which the belt will not slip under peak load condi-
tions. Do not over-tension drive belts. Over-ten-
sioning will shorten both drive belt and bearing life.
Under-tensioning will cause belt slippage. Always
keep belts free from dirt, grease, oil and other for-
eign material which may cause slippage.
GROUNDING
If the pump has been approved to pump volatile or
flammable liquids, the unit must be grounded by
attaching the ground wire assembly to a ground
rod in order to eliminate electrostatic build-up by
the liquid being pumped. Install the ground rod in
accordance with the National Electrical Codes and
all local codes. Be sure the fastening device makes
a tight electrical connection with the rod and the
pump.
Inspect and test the ground wire assembly
for conductivity. replace broken or frayed
wire before resuming operation.