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Gorman-Rupp Pumps PAH3A60C-B 1524589 and up User Manual

Page 13

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OM-06472

PAH SERIES

PAGE B - 5

INSTALLATION

Figure 3. Aligning Non‐Spider Type Couplings

Align non‐spider type couplings by using a feeler

gauge or taper gauge between the coupling halves

every 90

_

. The coupling is in alignment when the

hubs are the same distance apart at all points (see

Figure 3).

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.

Drive Belts

When using drive belts, the power source and the

pump must be parallel. Use a straightedge along

the sides of the pulleys to ensure that the pulleys

are properly aligned (see Figure 4). In drive sys­

tems 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 4. 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.