Revision 3
L-SSi Oil Plunger Lubricator
The stuffing boxes on your NLB high pressure water jetting unit have been provided with a
mechanical lubricator which is belt driven from the pump crankshaft. This automatically
places oil on the plungers.
Packing and plunger life is greatly extended, under all conditions,
by providing this lubrication.
Safe level sight feed is standard equipment. The sight feed glass in the Model
L-55i
pump is
dependent on a vacuum seal.
Oil enters the sight glass chamber on the downward or suction
stroke
of
the plunger and is delivered
on
the upward or pressure stroke
of
the plunger.
The safe level sight feed serves a double purpose. First, a flow rate can be determined by
counting the drops
of
oil delivered per minute. Second, the sight feed serves as a warning
device when excess air infringement causes the oil level in the sight glass
to
diminish.
Diminishing oil level is a condition that is caused by air that gets trapped in the sight glass.
This air will eventually enter into the valve system in the pump and cause pump air lock.
The condition is associated with the use
of
crankcase oils. Some success in dealing with this
condition can be obtained by the use of settling tanks
to
remove such air before it enters the
lubricator.
L-SSi Oil Plunger Lubricator Drip Flow Adjustment
The lubricator may be adjusted to provide varying rates
of
flow.
Conversion factors based on
SAE 15W40 oil at room temperature:
1 drop
= Average drop size .0023 cu.
in.
500 drops = 1 cu. in.
1 pint
of
oil = 12,608 drops
Adjustment
of
drip rate may be accomplished by loosening the lock nut with a wrench
(Figure 5-4). Turn the adjusting screw clockwise (downwards) for less oil, or turn it
counter-clockwise (upwards) for increased oil drip rate.
Figure
5-4.
Drip rate adjustment.
© Copyright August, 2000 NLB Corporation
5-19
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