Power-Flo Pumps & Systems • 877-24PUMPS • www.powerfl opumps.com
9
Pressure builds up extremely
fast, increase pressure by
“TAPPING” air nozzle. Too much
pressure will damage seal.
DO
NOT exceed 10 P.S.I.
Seal Chamber
- Set pump on its side with
fi ll plug (30) downward, remove plug (30)
and drain all oil from seal chamber. Apply
pipe sealant to pressure gauge assembly
and tighten into hole in intermediate
coupling (5). Pressurize seal chamber to
10 P.S.I. and check for leaks.
Oil Replacement:
Motor Housing -
Drain all oil (if not
already done so) from motor housing
and dispose of properly per Local and
Environmental Standards.
Set pump upright and refi ll with new
cooling oil, see “Cooling Oil” chart. Fill to
just above motor as an air space must
remain in the top of the motor housing to
compensate for oil expansion. Apply pipe
thread compound to threads of pipe plug
(30) then assemble to motor housing (8).
Seal Chamber -
Drain all oil (if not already
done so) from seal chamber and dispose
of properly per Local and Environmental
Standards. Place pump on its side with
plug (30) upward, and refi ll with new oil,
see “Cooling Oil” chart. Apply pipe thread
compond to threads of pipe plug (30) and
assemble to intermediate coupling (5).
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.
Cooling Oil
Recommended Supplier/Grade
BP
Enerpar SE100
Conoco
Pale Paraffin 22
Mobile
D.T.E. Oil Light
Shell Canada
Transformer-10
Texaco
Diala-Oil-AX
WARNING ! - Before any service
work is done, disconnect and
lock out electrical power to
pump.
Disassembly
Cutter -
Lay pump on its side and remove
the cutter retaining screw (29) and washer
(28). A small amount of heat may be
needed to loosen screw.
DO NOT
overheat.
Wedge a fl at screwdriver between cutter
and shredding ring and remove screw.
With a hammer and punch, tap the cutter
(27) counter-clockwise to remove.
CAUTION ! - Cutter edges are
very SHARP. Cutter must be
removed before removing volute.
Volute -
Remove hex nuts (25) and
washers (9) from studs (26) and remove
volute (23) and square ring (24) from
pump.
Shredding Ring -
To replace or reverse
the shredding ring (20), remove allen
screws (22) and lift throat (21) from volute
(23) then press out using an arbor press.
The shredding ring (20) can be pressed
out and reversed when cutting edges dull.
Impeller -
Remove impeller (18) by
turning counter-clockwise while holding
the motor shaft stationary with a
screwdriver.
NOTE:
Seal spring is relaxed
with impeller removed, some oil may
seep from seal cavity.
Do Not
store pump
without impeller in place.
Outer Seal -
Handle seal parts with care.
Remove seal (34) spring and rotating
member from shaft. Examine all seal
parts. Inspect contact faces for signs of
uneven wear tracks on stationary, chips
and scratches on either seal face.
DO NOT
interchange seal components, replace
the entire shaft seal (34).
Seal Plate -
Remove cap screws (35) and
washers (38) from seal plate (19). Remove
seal plate (19) and square ring (24) from
intermediate coupling (5). With fl at
screwdriver, press out seal (34) stationary
member. Inspect square ring (24) for cuts
or abrasions.
Cable Assemblies -
Remove Hex plugs
(13B) and (14B), washers (13C) and (14C)
and gromeents (13D) and (14D) from
conduit box (11).
Motor -
Remove pipe plug (30) and drain
oil if not already done so. Position pump
upright using blocks or pvc pipe to avoid
resting pump on the shaft. Remove cap
screws (15) and lockwashers (16) from
cable box assembly (11) and slide conduit
box up the cords until motor lead wires
are exposed. Disconnect connectors (17)
from motor leads wires to remove cable
assemblies (13) and (14). Remove ground
screw (31). Remove and inspect o-ring
(12).
Remove cap screws (10) and lockwashers
(9) from motor housing (8). Vertically lift
motor housing (8) from intermediate
coupling (5) along with square ring (7),
replace if cut or damaged. Remove motor
bolts and carefully remove stator housing
from rotor. Remove retaining ring (2) from
intermediate (5) and pull rotor out with
bearing (3) and rotating member of inner
seal.
Service
PFG 3, 5 & 7.5HP
Submersible Grinder Pumps
