Revision 6
Starting Instruction:
1.
Remove the dropper from the sight glass and fill approximately 1/3 full with oil.
2.
Manually operate the pump with priming stem until the oil flows from the pump outlet
without air bubbles.
3.
Connect the feedline to the pump outlet union and manually operate the pump with the
priming stem until the feedline is filled.
4.
Connect the feedline to the lubrication point. A feedline check valve
at
the lubrication
point is recommended and
is
available
as
an accessory item.
5.
Refill the sight glass to the 1/3 full level with SAE 15W40 oil.
6.
Refill the lubricator reservoir and adjust the pump output.
Setting Pump Output:
Count the number
of
drops falling through the sight glass in one minute. Set the adjusting
sleeve to obtain the desired quantity and secure the setting with the locknut.
Conversion Factors*
1
drop=
500 drops=
1
pint=
0.002 cubic inch
1 cubic inch
12,608 drops
*Conversion factors are based on
SAE 15W40 oil
at
room temperature.
Sight Glass:
The sight glass gives a visual indication of the condition
of
the oil flowing through the
lubrication pump.
An
increasing oil level indicates absorption of air in the sight glass by the oil passing
through.
Over fill eliminates visual metering
of
drops in the sight glass but has no effect on
pump operation.
Airlock:
Airlocking occurs when air, instead
of
oil, enters the plunger bore and cannot be compressed
to
a high enough pressure to be forced out
of
the pump against the feed line back pressure.
Airlocking
is
caused either by entrained air being separated from oil by the vacuum in the
sight glass, or by air entering the pump when the oil level in the lubricator reservoir
is
lower
than the suction tube inlet. Severely agitated oils, such
as
oil supplied from the crankcase,
will usually contain entrained
air.
An airlock can be easily detected since, when it occurs, no
oil will be visible in the sight glass.
If
entrained air
is
found to be a problem, either a
pressurized pump supply or a settling tank should be utilized.
© Copyright October,
2001
NLB Corporation
8-70
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