SERVICE INSTRUCTIONS
DISASSEMBLY
1.
Remove the four end cover screws. Remove end
cover and O-ring.
2.
Remove the four screws holding the body to the bear-
ing housing flange. Slide body, complete with impeller
and wearplate, from pedestal and shaft assembly.
3.
Remove mechanical seal by inserting two screwdrivers
behind seal collar, and gently lever collar and seal
assembly forward on shaft. Use extreme care not to
mar shaft surface. Remove seal seat and rubber cup
from recess in wearplate.
4.
From the drive end of the bearing housing, pry out
bearing seal by inserting a screwdriver blade between
OD of the seal and housing. Remove retaining ring.
Very carefully withdraw shaft and bearing assembly.
5.
Remove inner bearing seal and retaining ring.
6.
To remove bearings from shaft an arbor press is
required. If an arbor press is not available then a bear-
ing extractor may be used. Supporting inner race of
bearing, apply a steady pressure on shaft until bearing
slides free. Repeat this procedure to remove second
bearing.
ASSEMBLY
1.
To replace bearing on shaft. Support ball bearing on its
inner race and locate shaft onto bearing. Apply a
steady pressure to the shaft until bearing locates
against shoulder on shaft. Repeat for second bearing.
2.
Fit retaining ring and bearing seal into impeller end of
bearing housing. Spring on bearing seal to face out-
wards.
3.
Apply bearing grease around and between bearings,
filling cavity between bearings two thirds full. Smear
grease on shaft where bearing seal locates. Push shaft
and bearing assembly into bearing housing.
4.
Replace retaining ring and outer bearing seal with
spring facing outwards.
5.
Replace mechanical seal by sliding spacer onto shaft
up to locating shoulder, then smear shaft with light
lubricating oil. Push on seal gently until it engages with
spacer. Fit rubber cup and seal seat into wearplate.
6.
Insert impeller in pump body, fit O-ring in each end of
the pump body. Fit wearplate to body.
NOTE: A gap should be maintained between bearing hous-
ing and body. DO NOT overtighten screws.
7.
Slide wearplate and body assembly over shaft, posi-
tion wearplate in housing. Fit body to pedestal with
screws. Torque screws to 20 in. lbs.
8.
Fit end cover and end cover screws. Torque screws
to 20 in. lbs.
9.
Changing Pump Rotation (looking at end cover):
Clockwise Rotation: Insert impeller into pump body
with blades bending counterclockwise.
Counterclockwise Rotation: Insert impeller into pump
body with blades bending clockwise.
pling must be pressed on shaft, remove end cover
and impeller to support shaft from impeller end dur-
ing press operation. Do not hammer pulley or cou-
pling on shaft; this may damage bearing or seal.
Capacitor start motor is required to overcome start-
ing torque of impeller.
3.
SPEEDS – 100 RPM to the maximum shown in the
performance curves. For longer pump life, operate at
lowest possible speeds. Lower speeds are required
for viscous liquids. Consult the factory for proper
speeds and horsepower requirements.
4.
SELF-PRIMING – Primes at low or high speeds. For
vertical dry suction lift of 10 feet (neoprene/nitrile) –
4 feet (viton/EPDM), a minimum of 860 RPM is
required. Pump will produce suction lift up to 22 feet
when wet. BE SURE SUCTION LINES ARE AIR-
TIGHT OR PUMP WILL NOT SELF-PRIME.
5.
DISCHARGE – When transferring liquids further
than 25 feet, use one size larger discharge line than
discharge port size.
6.
RUNNING DRY – Unit depends on liquids pumped
for lubrication. DO NOT RUN DRY for more than 30
seconds. Lack of liquid will damage the impeller.
7.
CHEMICAL
COMPATIBILITY
– Consult the
Chemical Resistance Guide in the JABSCO
Industrial Pump Catalog (available upon request
from ITT Jabsco) or factory for proper body materi-
als and impeller compounds. If corrosive fluids are
handled, pump life will be prolonged if pump is
flushed with a neutralizing solution after each use or
after each work day. A Tungsten Carbide Seal varia-
tion is available for pumping liquids that contain
abrasives or are highly corrosive.
8.
PRESSURES – Consult Performance Curves for
maximum recommended pressures for pumps in
continuous operation. If pressures exceed those
shown, consult the factory.
9.
TEMPERATURES – The operating temperature lim-
its of the pump depend on the impeller compound.
The following ranges apply: Neoprene - 45° to 180°
F (7° to 82° C), Nitrile - 50° to 180° F (10° to 82° C),
Viton - 60° to 180°F (15° to 82°C), EPDM - 45° to
185°F (7° to 85°C).
10. IMPELLER TORQUE – The torque required to initi-
ate rotation of a new impeller in a dry pump body is:
Standard Pressure Impeller (14281-Series):
Forward = 1.5 pounds force – feet
Reverse = 4.3 pounds force – feet
High Pressure Impeller (8980-Series):
Forward = 3.0 pounds force – feet
Reverse = 6.9 pounds force – feet
These values may vary slightly due to impeller com-
pounding, blade set, and body material of construc-
tion. Consult factory for more information.
11. SPARE PARTS – To avoid costly shutdowns, keep a
spare JABSCO impeller, seal and O-ring set on
hand.
