DIAPHRAGM PRIMER
OM-07297
PAGE B - 3
INSTALLATION
Align spider insert type couplings by using calipers
to measure the dimensions on the circumference
of the outer ends of the coupling hub every 90
_
.
The coupling is in alignment when the hub ends
are the same distance apart at all points (see Fig
ure B‐2).
Figure B‐2.
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 B‐3).
Figure B‐3
.
Aligning Non‐Spider Type Coupling
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 Below). 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 B‐4. V‐belt Alignment
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 diaphragm primer may dam
age both diaphragm primer and power source.
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 in accordance with the belt manufacturer's
instructions. 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 v‐belts. Over‐tensioning
will shorten both v‐belt and bearing life. Under‐ten
sioning will cause belt slippage. Always keep belts
free from dirt, grease, oil and other foreign material
which may cause slippage.
