Pd pump Systems neslab p/N 000878 Rev. 08/15/96 Service Manual

Motor Lubrication
PD pumps are generally powered by sleeve-bearing carbonator
type motors, NEMA type 48YZ**. These motors must be run on a
horizontal-shaft orientation, due to the internal oil reservoir. A wick
runs from the reservoir to each bearing. The motor will have either
one or two lubrication ports, depending on the manufacturer.
A good source of oil is the 3-IN-ONE®
brand squeeze cans manufactured by
Boyle-Midway, Inc. It should be available
at hardware stores or electrical supply
houses.
**exception: Blue IMOFA-brand motors and grey MAC-brand
motors are ball bearing and require no periodic lubrication.
Figure 28
Figure 29

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The motor should be oiled periodically in accordance with the
nameplate directions. In the absence of legible lubrication instruc-
tions, add 30 - 35 drops of SAE 20 non-detergent oil to each oil
port. Use the following table as a frequency guide:
Duty
Oiling frequency
Continuous
Annual
Regularly
Every 2 years
Occasional
Every 5 years
Figure 30
Table 1

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Strainer - PD1
All PD pumps require a 100-mesh strainer on the inlet side of the
pump. Particles that are trapped are of sufficient size to destroy
the vanes of the pump. Never run the pump with a missing or
damaged strainer screen.
The PD1 pump has an internal strainer screen.
Figure 31

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Periodic cleaning of the screen is necessary. The screen may be
removed without significant fluid loss. Turn the unit off and discon-
nect from the power source. Have a clean rag handy which has
been dampened and twirled into a pointy shape. Remove the
strainer cap using an open end or socket wrench. Pull out the
screen and quickly stuff the rag into the opening. Some spillage
will be unavoidable. If a helper is available, the helper could hold
the rag tightly in place while you clean the screen. (You can tem-
porarily reinstall the strainer cap finger tight.)
The debris will be inside the screen. Clean the screen under
running water. A toothbrush is a handy tool for cleaning. Trim the
bristles to 1/2 length for a PD1 screen. An alternative is to take a
coarse paper towel (the brown roll type), dampen it and twist it into
a spiral. Pull it through the screen several times, turning it as it
passes. Inspect the screen closely for damage - particularly holes.
It is advisable to keep a spare screen on hand. The spare may be
quickly substituted for the dirty screen, minimizing downtime and
fluid loss. Then the dirty screen may be cleaned at your leisure and
retained as the spare for next time.

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Strainer - PD2
All PD pumps require a 100-mesh strainer on the inlet side of the
pump. Particles that are trapped are of sufficient size to destroy
the vanes of the pump. Never run the pump with a missing or
damaged strainer screen.
The PD2 pump has an external strainer screen, located on the
pump inlet line. It may be a brass body type (Figure 32), a
plastic type (Figure 33), or it may be a basket type inside the
reservoir on HX units.