Power-Flo Pumps & Systems • 877-24PUMPS • www.powerfl opumps.com
14
Maintenance
No lubrication or maintenance is required.
Perform the following checks when pump
is removed from operation or when pump
performance deteriorates:
a). Inspect motor and seal chambers for
oil level and contamination.
b). Inspect impeller and body for
excessive build-up or clogging.
c). Inspect motor, bearings and replace
if
required.
d.) Inspect seal for wear or leakage,
replace if required.
Servicing
Reference Figure 6 .
Cooling Oil -
Anytime the pump is
removed from operation, the cooling oil
in the motor housing should be checked
visually for oil level and contamination.
To check oil, set unit upright. Remove
cap screws (6), lift conduit box assembly
(4) from motor housing (3),
Do Not
disconnect wiring from motor leads. With
a flashlight, visually inspect the oil in the
motor housing (3) to make sure it is clean
and clear, light amber in color and free
from suspended particles. Milky white oil
indicates the presence of water. Oil level
should be just above the motor when
pump is in vertical position.
Seal Chamber -
Drain oil from seal
chamber by placing pump on its side
with pipe plug (18) downward and
remove pipe plug (18). If the oil is found
to contain considerable water or other
contamination, the shaft seal (19) should
be inspected and replaced if required.
Oil Testing
• Drain oil into a clean, dry container by
placing pump on it’s side, remove cap
screws (6), lift conduit box assembly
(4) from motor housing (3). In sepatate
container drain seal chamber by
removing pipe plug (18).
• Check oil for contamination using an
oil tester with a range to 30 Kilovolts
breakdown.
• If oil is found to be clean and
uncontaminated (measuring above
15 KV. breakdown), refill the housing.
• If oil is found to be dirty or contaminated
(or measures below 15 KV. breakdown),
the pump must be carefully inspected
for leaks at the shaft seal, conduit box,
o-rings, pipe plug and pressure valve,
before refilling with oil. To locate the
leak, perform a pressure test.
After leak is repaired, dispose of old oil
properly, and refill with new oil.
Pressure builds up extremely
fast, increase pressure by
“TAPPING” air nozzle. Too much
pressure will damage seal. DO
NOT exceed 10 P.S.I. in motor
housing and 20-25 P.S.I. in seal
chamber
Pressure Test
Motor Housing -
Oil should be at normal
level. Remove pressure valve (11) from
motor housing (3). Apply pipe sealant
to pressure gauge assembly and tighten
into hole (See Figure 2). Pressurize motor
housing to 10 P.S.I. Use soap solution
around the sealed areas above the oil
level and inspect joints for “air bubbles”.
If, after five minutes, the pressure is still
holding constant, and no “bubbles” /oil
seepage is observed, slowly bleed the
pressure and remove the gauge assembly.
Replace oil. Leek must be located and
repaired if pressure does not hold.
Seal Chamber -
Check that seal chamber
is full of oil by removing pipe plug (18).
Apply pipe sealant to pressure gauge
assembly and tighten into hole in bearing
bracket (15). Pressurize seal chamber to
20-25 PSI and check for leaks.
Oil Replacement
- Set unit upright and
refill with new cooling oil as per table.
Fill to just above motor as an air space
must remain in the top of the housing to
compensate for oil expansion. Reassemble
the o-ring (5) and conduit box (4) to
motor housing (3). Apply thread locking
compound to cap screws (6) and place into
holes and torque to 15 ft/lbs.
DO NOT
overfill oil. Overfilling
of housing with oil can create
excessive and dangerous hydraulic
pressure which can destroy the
pump and create a hazard.
Overfilling oil voids warranty.
Oil Replacement: Seal Chamber -
Refi ll
chamber completely full with new cooling
oil or reuse the uncontaminated oil.
Figure 2
Service
PF6NC & PF6NC-H
Submersible Non-Clog Pumps
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