10. IMPELLER TORQUE –
The torque required to initiate
rotation of a new impeller in a dry pump body is:
Standard Pressure Impeller (14281-Series):
Forward = 4.8 pounds force-feet
Reverse = 11.2 pounds force-feet
High Pressure Impeller (8890-Series):
Forward = 7.9 pounds force-feet
Reverse = 16.3 pounds force-feet
These values may vary slightly due to impeller
compounding, blade set, and body material of
construction. Consult factory for more information.
11. SPARE PARTS –
To avoid costly shutdowns, keep a
spare JABSCO impeller, seal and O-ring set on hand.
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 bearing
housing flange. Slide body, complete with impeller and
wearplate, from pedestal and shaft assembly.
3. Remove mechanical seal by inserting two screw-
drivers 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.
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
bearing 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
outwards.
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 en gages with
spacer. Fit rubber cup and seal seat into wearplate.
6. Insert impeller in pump body, fit O-ring in each end of
is desired, follow steps 1 and 2 of disassembly and
step 9 of assembly instructions to change direction
of impeller blade deflection under cam.
2.
DRIVE –
Belt or direct with flexible coupling.
Belt Drive: Over tight belt load will reduce pump
bearing life.
Direct Drive: Clearance should be left between drive
shaft and pump shaft when installing coupling.
Always mount and align pump and drive shaft before
tightening the coupling set screw. If pulley or
coupling must be pressed on shaft, remove end
cover and impeller to support shaft from impeller end
during press operation. Do not hammer pulley or
coupling on shaft; this may damage bearing or seal.
OPERATING INSTRUCTIONS
(Cont.)
Capacitor start motor is required to overcome
starting 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 speed and horsepower requirements.
4.
SELF-PRIMING –
Primes at low or high speeds. For
vertical dry suction lift of 10 feet (neoprene/nitrile/Viton)
– 7 feet (EPDM), a minimum of 860 RPM is required.
Pump will produce suction lift up to 22 feet when wet.
BE SURE SUCTION LINES ARE AIRTIGHT 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 liquid 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 factory) or factory for proper body materials
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
variation 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
limits 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).
