6
B1d.1
4/06
Supercedes 8/05
PACOPACO
PACOPACO
PACO
PUMPS
• The packing gland should be tightened evenly to pro-
vide uniform compression on the packing material.
Do not operate packing dry, and do not over
tighten packing gland to eliminate leaking as
the shaft sleeve will become damaged. After initial
start up, additional packing and adjustment may
be required until the packing is properly seated.
L. MECHANICAL SEALS
• All PACO Type KP Double Suction Centrifugal Split
Case Pumps that are equipped with mechanical
seals are matched to the conditions for which the
pump was sold. Observe the following precautions
to avoid seal damage and obtain maximum seal life.
• Do not exceed temperature or pressure limitations
for the mechanical seal used.
• Do not run the pump dry or against a closed
valve! Dry operation will cause seal failure within
minutes.
• Purge all air from the seal chambers and recircula-
tion lines prior to operating the pump.
• Clean and purge suction piping in new installations
before installing and operating pump. Pipe scale,
welding slag and other abrasives can cause rapid
seal failure.
• The mechanical seal does not leak at all during
normal operation, therefore if any appreciable leak-
age occurs, the seal should be removed, inspected
and if necessary replaced. Mechanical seals
should be stocked as spare parts to reduce
equipment down time.
M. COUPLING ALIGNMENT
• The following anchoring and alignment procedure is
typical and, if performed with care, should result in a
smooth running, trouble-free installation.
• If the pump and motor were shipped mounted on the
pump base as an assembly, remove the coupling
guard.
• The pump and motor were accurately aligned at the
factory, but handling during shipment usually alters
this pre-alignment. Using a small straight edge and
feeler gauges or a dial indicator, check for horizon-
tal, vertical, and angular misalignment of the cou-
pling hubs (Fig. 5a).
• Coupling alignment is proper when the dial indicator
reads no more than .005" runout in any direction (or
when the straight edge contacts both hubs evenly
FIGURE 5a: Checking Angular Alignment.
Checking Angular Alignment
Checking Parallel Alignment
in both horizontal and vertical positions). If misalign-
ment is detected, loosen the motor and shift or shim
as necessary to re-align, then re-tighten bolts. Al-
ways align the motor to the pump as piping
strain will occur if the pump is shifted.
Never reposition pump on base!
• After final piping connections to the pump have been
made, motor wiring compared, correct rotation has
been established, and piping filled with liquid, check
shaft alignment once again.
• Leave the coupling guards off until the pump prim-
ing procedure is completed for a final shaft align-
ment check.
• To protect personnel from rotating machinery,
Always install coupling guards after installation
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