Page 8 of 24 FLOMAX 8 BZ AL (en)
Electric motors or other rotating equipment used to drive the
pump should be lubricated in accordance with the manufac-
turer’s instructions.
DISASSEMBLY:
Drain the housing by removing the drain plug. Remove the
hex nuts and lock washers from the housing studs. Slide the
bearing housing/impeller assembly out of the housing. It
may be necessary to rotate the driver shaft out of the way.
With the bearing /impeller assembly on a bench secure shaft,
unthread impeller nut then unthread impeller. Remove the
seal from the shaft. Lift o the seal plate. Place the seal plate
face down on the bench and press the seal seat out.
Remove the snap ring from the backside of the bearing hous-
ing. With a soft mallet, loosen the shaft assembly by tapping
the impeller end then slide the bearing assembly from the
housing. Press the bearings from the shaft.
ASSEMBLY:
Press bearings onto the shaft. Slide the shaft / bearing assem-
bly into the bearing housing and install the snap ring. Place
seal housing face up on bench. Lubricate non-PTFE seal seat
with water-soluble lubricant and gently press into seal hous-
ing. If pinned seat is used be certain that pin is in place, lined
up with groove in seal seat. Place seal housing onto pilot of
bearing housing. Lubricate shaft with water-soluble lubricant.
Slide seal onto shaft.
MAINTENANCE
The FLOMAX pump is of simple construction with only one
moving part. The impeller on the FLOMAX 8 is threaded to
a stainless steel drive sleeve. The sleeve slips over the drive
shaft and is locked to the drive shaft with a two-piece clamp.
This means you use a standard drive shaft - no special tapers
or threads. It's easy to adjust or remove the impeller. FLO-
MAX pumps are available with either a self lubricated shaft
seal, or a grease lubricated shaft seal. The self-lubricated seal
is lubricated by the liquid in the pump. Operating the pump
dry will seriously damage the seal.
To lubricate the grease lubricated seal, turn the wing nut on
the grease cup to the left - counter clockwise. If the pump
is to be left standing idle for any length of time in freezing
conditions, the pump housing should be drained. Draining is
provided for by a drain plug located at the base of the pump
housing.
DISASSEMBLY
Disconnect power (or spark plug wire) to prevent accidentally
starting.
Disconnect lines and drain pump housing.
TO REMOVE PUMP HOUSING
Remove Cap Screws and nuts holding pump housing to mou-
nting base (where used).
Remove nuts and lockwashers holding pump housing to the
adapter.
Loosen the housing and remove carefully to prevent tearing
gaskets.
TO REMOVE IMPELLER
If pump is equipped with a grease lubricated seal, relieve
pressure in grease cup by turning wing handle to the right -
clockwise.
Remove impeller clamp nuts and clamp to unlock impeller
drive sleeve from drive shaft.
Use two “jimmy” bars or large screwdrivers diagonally across
from each other between adapter and end of drive sleeve.
Pry the sleeve o the drive shaft.
Before removing the seal from the impeller, inspect the
carbon washer. If nicked or worn - replace it with a new one.
Inspect the seal seat (still in the pump adapter). If no nicks,
scratches or cracks appear and surface is clean and smooth,
there is no need to replace it. If replacement is necessary,
remove adapter by removing four hex nuts and washers.
Place adapter on at surface, with impeller side down. Press
out seal seat by using wooden end of a screw driver or similar
tool.
TO REPLACE IMPELLER
On the two-piece impeller it is not necessary to remove the
seal. Place impeller drive sleeve between two pieces of wood
in a vise. Hold impeller sleeve carefully so you do not damage
the seal assembly. Hold rmly and unthread impeller by turn-
ing counterclockwise - left hand. Replace with a new impeller.
Be sure seal spring ts over hub on back of impeller.
TO REMOVE ADAPTER
Remove the four nuts and lockwashers. Loosen and remove
adapter.
TO REMOVE WEAR PLATE
After pump housing has been removed from the adapter,
inspect the wear plate. If wear plate is badly worn, it should
be replaced. To remove wear plate, loosen and remove acorn
nuts and gaskets on the outside of the pump housing.
CAUTION: When replacing wear plate, be sure to use new
gaskets under acorn nuts to seal against air leaking in on suc-
tion side during priming cycle.
INSPECTION
After pump has been disassembled, check all parts over care-
fully for wear or damage. When ordering parts for your pump,
be sure to specify model and serial numbers shown on name
plate.
REASSEMBLY
MOUNTING ADAPTER
Before mounting adapter, clean counterbore with cleanser.
Clean and lubricate with light oil the synthetic rubber mem-
ber on seal seat and press (do not drive) the assembly into
the adapter counterbore, seating it rmly and squarely.
Install adapter. Install lockwashers and tighten four nuts
evenly.
CAUTION: In handling, avoid dropping seat and take particu-
lar care not to scratch the lapped face.
MOUNTING SELF-LUBRICATED SEAL ASSEMBLY
Mount seat and seat ring (Part 4 and 5) as outlined above.
Inspect impeller sleeve for nicks and burrs. Polish sleeve with
fine emery or crocus cloth. Then clean and lubricate with a
clean light oil.
Slip the coil spring (Part 1) onto the impeller sleeve making
certain that it is seated properly on the shoulder of the impel-
ler.
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