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MAINTENANCE
4.
Lubricate
inside diameter
and outer
face of rubber
drive ring with soapy water and slide assembly
on
motor
shaft (sealing
face first) until rubber
drive
ring hits shaft shoulder.
5.
Screw
impeller
onto
the shaft until impeller
hub
stops against
shaft shoulder. This will automatically
locate
seal in place
and move the sealing
washer
face up against seat facing.
Cleaning Impeller
1.
Disconnect
power
to pump.
2.
Remove
motor.
(a) Remove
motor
wiring
from pressure
swttch.
Co)Remove
4 capscrews,
Key No.
17, Page
10,
which
hold the motor
to the pump
body.
(c) Remove
motor,
seal plate, impeller
and diffuser,
(Key
Nos.
1, 3, 6 and 7), Page
10, as a unit.
Diffuser,
Key No. 7, can now be lifted off and the
impeller
exposed
and cleaned.
Replacing
Venturi
Follow
Steps
1 and
2
above,
for
Cleaning
Impeller.
1. Remove
venturi,
Key No. 9, Page 10, by turning
it
counter-clockwise.
This will expose
the nozzle, Key
No. 10, which
can be removed
by using a 5/8" hex
socket and turning
it counter-clockwise.
2.
To replace
venturi,
turn it clockwise
until snug.
3.
Replace
all parts.
Connect
motor
wiring
and turn
on power.
Cleaning
Shallow
Well
Jet
1.
Disconnect
power
to pump.
2.
Unscrew
cleanout
plug (Key No. 15, Page 10) from
pump.
3.
Insert
an ice pick or other
small diameter
pointed
tool into the nozzle
and dislodge
foreign
material.
If it is not possible
to push the obstruction
through
the nozzle
or if the nozzle
is damaged,
follow
in-
structions
above under
"Replacing
Venturi".
4.
Replace
all parts.
Connect
motor
wiring
and turn
on power.
HOW
TO HANDLE
A GASEOUS
WELL
In some
localities
well water
contains
gases
which
must be allowed
to escape
before
the water
is used.
This can be done as shown
in Figure 8.
A good way of delivering
gas-free water
is to suspend
a pipe, closed
at the bottom
and open at the top, sur-
rounding
the suction
pipe,
Figure 8. Since the gases
rise in the well casing, the water sucked
down through
the pipe and into the suction
pipe is free of gas. It is
imperative
that this type of well be vented
to the out-
side of any enclosure.
Air
Control
In Flowing
Wells
Flowing
wells,
or wells with little or no drawdown,
could create
a special problem
in air control
in the op-
eration
of your water
system.
In such
cases,
it is recommended
that you install
a
Captive
Air * Tank, in which
an air control
mechanism
is not required.
wire to hold
pipe sleeve
Not
pipe
to
valve
Scale
2369 0396
sloeve
cap
Figure 8
Pump
Model
390.2505
Pump Performance
(In Gallons per Minute)
Description
1/2 HP Cast Iron
Shallow Well Jet
Suction
Size
I-I14"
Discharge
Discharge
Size
Pressure PSI
1 n
4O
Pumping Depth in Feet
5'
10'
15'
20'
8.2
7.3
6.2
5.0
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