5
serviced
by
any
reputable
serviceman. When any field
servicing is performed on a pump,
the following instructions should
be followed carefully.
Disconnecting Pump Cords:
If a HYDROMATIC explosion
proof pump is to be removed from
its location, the pump cords may
be disconnected at control panel
(on sump mounted control panels)
and cord assembly taken with
pump.
CAUTION: If cord openings
from sump to control panel are
open, gases from sump could
enter panel and an explosive
condition could exist. Seal
openings!
CAUTION: Do not reconnect
power to a cord and cap
assembly
while
removed
from pump.
Replacing Cords:
The power cord and heat
sensor/seal failure cord are potted
into the connection box cap,
forming the cord and cap assembly.
If cords require replacement due
to damage or cords being too short,
cord and cap assembly must be
replaced as a complete assembly
available from factory.
1. Remove
cord
and
cap
assembly.
2. Disconnect wires taking note
of color/number coding.
3. Connect wires of new cord and
cap assembly in same manner
as old one was removed.
4. Reinstall
cord
and
cap
assembly taking care not to
pinch wires.
5. Check pump for proper
rotation before returning to
normal service.
Replacing Grinder Parts:
If necessary to replace grinder
parts because of wear or to inspect
for clogging:
1. Close
gate
valve
at
pump discharge.
2. Turn off circuit breaker.
CAUTION: Never work on
pump with power on. Be sure
ground wire from pump is
connected to a good ground
such as a water pipe.
3. Remove pump from sump.
4. Remove machine screws (18)
and remove cutter ring
retainer (39).
5. Unscrew
hex
head
cap
screws (14) and remove
volute case (23).
6. Radial cutter (40) and axial
cutter (41) are now exposed.
If checking for clogging,
these parts can now be cleaned
without removing them from
the shaft.
7. If necessary to replace cutters,
remove hex head screw (19),
washer (20), and radial cutter
(40) from shaft.
Radial cutter (40) and impeller
(17) are screwed onto shaft.
The thread is right hand. Tap
radial cutter (40) with plastic
hammer if necessary to loosen.
Axial cutter (41) lifts off
impeller (17) and is held from
rotation by pin (21). Unscrew
impeller (17) from shaft in
same manner as radial cutter
(40), and remove washer (7).
8. Clean all parts thoroughly
before
proceeding
with
assembly. Make sure spring
pin (21) is inserted into
impeller (17). Replace case
volute (23) and hex head cap
screws (14).
9. Replace cutter ring (42) and
cutter ring retainer (39) with
machine screws (18).
10.Plug pump into power and
operate for a few seconds only
to ensure parts are not rubbing.
Replacing Seals:
1. Remove pipe plugs (11) from
motor and seal chamber and
drain out all oil. The lower
pipe plug drains the seal
housing. Check for water in
the oil drained from motor
chamber. If there is some
water
in
this
oil,
the
pump must be completely
dismantled and the stator dried
out or replaced if the
resistance to ground is less
than 500,000 ohms after
drying. A hypot check of 1,500
volts for 230 volt motors and
2,000 volts for 460 volt motors
should be performed.
2. Remove cutters, impeller and
pump parts as described under
“Replacing Grinder Parts”.
3. Remove socket head cap screw
(24) in seal plate (16) and
screw two of the screws into
the back off holes to force seal
plate (16) from seal housing
(26). Pulling this plate (16) off
will also force lower seal (22)
from shaft. Remove lower seal
(22) from seal plate (16).
4. Remove snap ring (25) and
pull upper seal (27) from shaft.
It may be necessary to use
packing hooks to remove
seal. Use a screwdriver to
break the upper stationary
ceramic seal ring so that it can
be removed easily.
CAUTION: Do not use any old
seal parts. Replace all parts
with new pieces. Mixing old and