4.
SELF-PRIMING – Primes at low or high speeds. For
vertical dry suction lift of 10 feet (neoprene) – 5 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.
PUMPAGE COMPATIBILITY
– Consult the
Chemical Resistance Guide in the JABSCO
Industrial Pump Catalog (available upon request
from the 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 pump 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 150° F (7° to 65° C),
EPDM - 45° to 185° F (7° to 85° C).
10. CLEANING – Before using pump, it should be
disassembled and cleaned to remove any dust and
dirt resulting from storage or shipping. Wash parts in
standard cleaning solutions approved for handling
stainless steel. Thoroughly rinse before reassembly.
DO NOT USE IODINE BASED SANITIZERS as the
iodine attacks the elastomer materials used in the
impeller.
All parts have been expertly machined and polished.
HANDLE WITH CARE. DO NOT DROP OR MISHANDLE.
11. IMPELLER TORQUE – The torque required to initiate
rotation of a new impeller in a dry pump body is:
Standard Pressure Impeller (7614-Series):
Forward = 1.5 pounds force – feet
Reverse = 4.3 pounds force – feet
High Pressure Impeller (8840-Series):
Forward = 3.0 pounds force – feet
Reverse = 6.0 pounds force – feet
These values may vary slightly due to impeller
compounding, blade set, and body material of
construction. Consult factory for more information.
12. 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 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
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
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.
7.
Slide wearplate and body assembly over shaft,
position wearplate in housing. Fit body to pedestal
with screws. Torque screws to 20 in. – lbs.
NOTE: A gap should be maintained between bearing
housing and body. DO NOT overtighten screws.
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.
