Specifications

6
Lapping
Or Blocking
Figure 1 Note: Part should be rotated by quarter turns as it moves
through a "Figure 8" pattern.
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Cleaning,
Inspection
and Repair
Zenith
®
metering pumps are made for
exacting duty. All parts are machined to
extreme accuracy; critical dimensions
are held between one and two ten-
thousandths of an inch (.0001"/.0002").
Accurate performance is dependent
upon proper handling. Please treat them
with care, and if it’s at all possible, set
aside a separate clean area for pump
maintenance.
It is recommended that pump users
institute a program of dimensional in-
spection of critical parts in order to keep
maintenance and operating costs at a
minimum. By noting the performance of
a pump immediately before removing it
from service and correlating the perfor-
mance to measured component wear,
the user can establish the maximum
wear limits for the pump’s critical com-
ponents. Further, the service life of the
pump can be predicted and downtime
scheduled accordingly.
As with any other Zenith
®
pump,
B-Series pumps may be returned to
Zenith
®
for complete rehabilitation. This
procedure may be desirable if only a
few pumps are involved. If a large
number of pumps are to be maintained
at the user’s plant, it may be worthwhile
to have key personnel attend a mainte-
nance seminar at Zenith
®
to learn the
manufacturing, gauging, and assembly
techniques involved in producing the
B-Series pump. In addition, Zenith
®
also
offers a contract service program. Please
contact Zenith
®
for further information on
these items.
Remember: Zenith
®
pumps are pre-
cision instruments. You can’t keep them
too clean. The slightest bit of debris may
cause damage.
Place two layers of 400-Grit Emery Cloth
on a lapping block or plate–a granite flat
is suitable. Apply light pressure to the
component and turn it in a “Figure 8”
pattern (as shown in Figure 1) approxi-
mately 10 times until a smooth finish
appears. Components that are commonly
lapped are the sides of metering gears
and the inside faces of front, rear and
center plates. The components are now
ready to be cleaned. An ultrasonic
cleaner with a safe industrial solvent (Nu
solution) is preferred, but you may also
use a large container filled with about
four inches of solution.
Caution: Never drop the components
into a tank or container; place them gently
onto the bottom to avoid damage.
Always use clean, lint-free rags and
compressed air to clean components.
Paper towels are not acceptable; they
may leave small pieces of paper and
dust on the components. Use chemical
brushes to clean between gear teeth,
bores and reliefs. Tooth brushes are not
acceptable. After all components are
“hospital clean,” the pump is ready for
assembly.
New parts should be deburred and
cleaned using the above procedures.