4
Installation
Pumps should be carefully unpacked to
make sure that the shipment is complete.
If any items are missing or damaged, the
freight carrier and Zenith should be notified
immediately.
While the pump is composed of steel,
it is a precision instrument. Dropping the
pump or hitting with a non-yielding material
can cause serious damage to the compo-
nents. All materials are through-hardened
to maximum hardness resulting in a brittle
material. Treat them as you would any
other precision gaging instrument.
Zenith pumps are shipped filled with a
rust preventative oil. Flush the oil thoroughly
with a cleaning solvent. It may be necessary
to disassemble the seal arrangement to
remove all traces of the oil, but disassemble
only if necessary.
After flushing, the pump should be lubri-
cated internally for start-up purposes. Pour
a suitable high-temperature lubricant into
the inlet port. Rotate the metering gears
until lubricant appears at the discharge port.
Mount the pump to a block with a flat-
ness of true flat to .0001" convex and
a surface finish of 4 to 8 rms to prevent
leakage between the pump and block.
Mounting bolts should be a Grade 8 or
better. Make sure mounting bolts are lubri-
cated with a high-temperature anti-seize
compound such as DAG Dispersion #154.
Bolts should be alternately torqued in
even increments up to Zenith’s recom-
mended limit for the bolt size used. See
Table 2 on page 10 for torque values.
The following is a brief “standard”
installation procedure. For special
applications, considerations, or simply
to ask our advice, please contact our
Applications Engineering Group.
To prepare the pump for use:
1) Always flush out the plumbing
system before connecting the pump.
2) Filters should be installed prior to
the pump inlet that filter ideally to half the
pump running clearances.
3) Turn pumps by hand before
running. Pumps should turn freely.
4) Engage the outer drive shaft care-
fully, making sure that it does not bottom
in the slot of the coupling,
*
and that it is
aligned within 1° angular and .005" paral-
lel with the true pump drive axis.
*NOTE:
The coupling is the rotating mem-
ber of the seal and depends on the inter-
nal operating pressure of the pump to
force it forward and effect a seal against
the carbon or metal seal plate.
5) In pumps with a through shaft and
compression packing seal, the pump-to-
driver axis may shift unevenly due to
pump heating expansion. To remedy this,
we recommend connecting the pump
driver to the pump shaft with the appropri-
ate Zenith SJM Coupling or with a double
universal joint arrangement. This type of
joint will prevent bending loads from
being transmitted to the pump shaft when
misaligned. This greatly reduces the pos-
sibility of premature shaft failure due to
fatigue. To prevent seizure, be sure to
apply adequate high-temperature lubrica-
tion to the universal joints.
6) Heat the pump thoroughly and
evenly (including the seal arrangement). A
time-saving heating alternative would be
to maintain a clean and ready-to-use
pump in an oven at operating tempera-
ture. This avoids thermal shock and saves
valuable heating time. Be sure to check
the pack-ings prior to use as extended
heat soaks tend to dry out some packing
materials.
7) Tighten the mounting bolts and
coupling housing screws to Zenith's
recommended torque at that operating
temperature.
8) Make sure fluid is in the pump
before starting. Be sure to apply positive
inlet pressure when metering high-viscosi-
ty fluids. Pumps with universal face seals
require an inlet pressure of approximately
25-50 psi to set the seal.
9) Start pump slowly and, if
possible, run it with a lubricating fluid.
10) When satisfactory operation is
achieved, the pump and system may be
gradually brought up to normal process
speeds and pressures.
11) If your pump has a packing seal,
take up firmly and evenly on the seal
gland screws to compress the packing,
then back off 1/2 turn of the screws or
until slight weepage occurs. Be sure to
adjust the gland properly. Do not over-
tighten. Overtightening can cause the
packings to burn.
12) Be sure to follow up closely
throughout the running-in period of the
packing until the seal is thoroughly seated.
Do not completely seat the packing in
one adjustment.
13) If at any time during operation the
pump does not appear to be running
smoothly, stop the pump immediately to
avoid any serious internal damage.
