Replacing Mechanical Seal; Maintenance - Franklin Electric B50S Owner's Manual

WARNING:
DO NOT RUN THE PUMP BEFORE PRIMING IT, SINCE THE SEAL AND IMPELLER COULD BE PERMANENTLY
DAMAGED.
a) PRIMING: Remove the priming plug located on the top of
the casing and fi ll the pump casing with water. Replace the
priming plug.
b) PRIMING UNDER PRESSURE: (Refer to Figure 1). Should
it be necessary to prime under pressure, place a check valve
on the discharge line of the pump and a pet cock or a ball
type air bleeder in place of the priming plug, or an air bleed
line with a gate valve connected to the discharge line. It will
then be possible for the liquid to remain in the discharge
pipe and allow the pump to draw the air bleeder, thereby
facilitating priming.
c) IMPELLER ROTATION: The impeller must rotate in a counter-
clockwise direction as seen facing the pump from the front
of the casing.
d) STARTING THE PUMP: Never operate the pump dry as this
may damage the seal. If an exceptionally long suction line is
used, the pump casing may become overheated or vapour
locked. Should this occur, replace the water in the casing
with cold water and continue priming.
e) DRAINING: Should the pump be subject to freezing tem-
peratures, it will be necessary to drain the pump completely.
To drain, remove the drain plug (10) located at the bottom
of the front face of the pump casing and the priming plug
(11) and make sure that the drain hole is not choked. After
a) LUBRICATION:
- The pump requires no lubrication.
- For electric motor, refer to instructions provided by the motor
manufacturer.
b)

REPLACING MECHANICAL SEAL:

(Refer to Figure 2)
To Disassemble:
- Disconnect electric power.
- Drain pump.
- Disconnect piping.
- Remove the 4 bolts (1) and take off the casing (2).
- Remove motor cap (8) and insert a screwdriver. Unscrew
the impeller (4) in a counter-clockwise direction.
- Slip the rotating seal (5) from shaft (7) of seal plate/motor
assembly.
- Remove seal plate (9) from the motor, being very careful
not to damage the ceramic seat (6).
- Inspect the ceramic seat (6), if it needs replacing, press it
out of the adapter from the motor end.
c) To Reassemble:
- Clean all parts thoroughly before reassembly. Use liquid
soap on the rubber cup on the ceramic seat (6) and push it
into the seal plate (9). Make sure that the smooth surface
of the ceramic seat faces outwards.
- Assemble the seal plate (9) to the electric motor, being
very careful so as not to damage the ceramic seat (6). -
Use liquid soap on the rotating seal (5) and slip it on to the
shaft (7) with the seal ring towards the ceramic seat (6).
Make sure that the seal ring face on the rotating seal is in
contact with the ceramic seat.
OPERATION - PRIMING THE PUMP
Fig. 1

MAINTENANCE

Fig. 2
- Screw on the impeller (4). Assemble the casing (2) and use a
- Reconnect pump to suction and discharge hoses.
PRECAUTIONS
a) Whenever the pump is dismantled and then reassembled,
b) The flinger on the motor shaft must not be removed.
2
all the water has been drained, operating the pump for a few
seconds will ensure that the impeller (4) is devoid of water
(make sure that the suction line is also devoid of water).
Valve
(min. 3/4")
new gasket (3). Check to ensure that the impeller can rotate
freely in the casing.
- All models have a fl inger (12) on the shaft. This fl inger must
not be removed.
always check to see that the impeller rotates freely within the
casing.
Discharge
Valve
Check
Valve
Pump
Air Bleed Line
Suction Line
Strainer