12
B1d.1
4/06
Supercedes 8/05
PACOPACO
PACOPACO
PACO
PUMPS
• Replace packing gland (7A).
• Packing requires lubrication. Therefore, it should
always be allowed to leak a 40 to 60 drops per
minute. Never over tighten packing gland.
• Should it become necessary to over tighten the
packing (suction lift applications) while starting the
pump, make sure to loosen packing immediately
after pump is started, allowing a leakage of a 40 to
60 drops per minute. Readjust after a few hours of
running, if leakage increases.
G. DISASSEMBLY OF HORIZONTAL PUMPS
• Remove bolts and nuts holding casing halves (1A &
1L) together, and remove capscrews holding bear-
ing housing (26J, 26K) to pump casing.
• Remove case roll pin (98M) then lift off upper case
(1A).
• Place casing gasket, as well as all other gaskets, in
water to keep them from drying out and shrinking.
• Remove shaft assembly from case.
• To disassemble rotating assembly, refer to Bearing Re-
placement.
• Unscrew and remove shaft sleeves (5A, 5D) or
impeller lock nuts by turning them in direction of
pump rotation. One has R.H. threads. The other
has L.H. threads. Do not place wrench on the part
of sleeve that comes in contact with seal or
packing. Use strap wrench.
• Pry wear ring retaining rings (61P) off of wear ring
(4A).
• Slide wear ring (4A) off impeller.
• Mark impeller (3D) with a mark on coupling side
before removing it from shaft to be sure it will be
reassembled identically.
• Press impeller (3D) from shaft (6A) and key (12A).
H. DISASSEMBLY OF VERTICAL PUMPS
• Remove coupling guard and remove coupling grid (23C).
• Remove all capscrews on bearing housings (26J, 26K)
except for two on lower case (1L) to hold rotating
assembly in place while removing upper case (1A).
• Remove case roll pin (98M) then lift off upper case
(1A).
• Place casing gasket, as well as all other gaskets, in
water to keep them from drying out and shrinking.
• Remove shaft assembly from case.
• To disassemble rotating assembly, refer to Bearing Re-
placement.
I. COMPONENT INSPECTION
• While the pump is disassembled, all components
should be inspected for wear, damage, deteriora-
tion or erosion.
• Shaft sleeves should be inspected and if worn or deeply
scored should be replaced.
• Impeller wear ring (if used) and casing wear ring
(4B) should be checked for erosion or wear and if badly
deteriorated, replaced to renew original pump perfor-
mance. The design clearance is .018" to .022"
diametrically. Clearances greater than .040" effect
pump performance and new rings should be installed.
• Examine the lapped faces of the mechanical seals
for scoring, heat checking or cracking. Examine
mechanical seal elastomers (rubber components)
for deterioration or hardening. Replace mechanical
seals if any damage exists.
• Check any external source of cooling or lubricating
fluid lines, and/or recirculation lines and ports
for clogs, kinks or other restrictions.
• Clean machined mating surfaces of all components
to remove grit, grime and/or old sealing material
before reassembling pump.
J. REASSEMBLY OF PUMPS
• Reinstall impeller (3D) and key (12A) on shaft (6A),
centering impeller on shaft with respect to sleeve or
lock nut threads. Be sure impeller is installed on
shaft the same way it came off, with vane curvature
and per mark made during disassembly. Note that
pump will deliver little or no water if impeller is in-
stalled backwards.
• Be sure a good O-ring gasket (17S) is in place on
each sleeve, if shaft has sleeves. Replace as
necessary.
• Replace shaft sleeves (5A, 5D) or nuts, turning them
in opposite direction of pump rotation.Do Not place
wrench on the part of sleeve that comes in contact
with seal or packing. Tighten evenly so impeller
position will not shift.
• Replace wear ring retaining ring (61P) over wear
ring (4A).
• Slide wear ring (4A) over each impeller hub.
(continued on page 15)
To Next Page
Loading...
