Hydromatic NSPG 200 Manual

Submersible Grinder Pump
NSPG 200
NOTE! To the installer: Please make sure you provide
this manual to the owner of the pumping equipment or to
the responsible party who maintains the system.
Pump Installation and Service Manual

2
Thank you for purchasing your
Hydromatic®pump. To help
ensure years of trouble-free
operation, please read the
following manual carefully.
Before Operation:
Read the following instructions
carefully. Reasonable care and
safe methods should be practiced.
Check local codes and
requirements before installation.
Attention:
This manual contains important
information for the safe use of
this product. Read this manual
completely before using this
product and refer to it often for
continued safe product use.
DO NOT THROW AWAY OR
LOSE THIS MANUAL. Keep it
in a safe place so that you may
refer to it often.
Unpacking Pump:
Remove pump from carton. When
unpacking unit, check for
concealed damage. Claims for
damage must be made at the
receiving end through the delivery
carrier. Damage cannot be
processed from the factory.
WARNING: Before handling
these pumps and controls,
always disconnect the power
first. Do not smoke or use
sparkable electrical devices or
flames in a septic (gaseous) or
possible septic sump.
Pump Description:
The Hydromatic pumps covered
by these instructions are
submersible grinder pumps.
The cutter blades are on the
suction side of the centrifugal
pump impeller and discharge
directly into the inlet of the
impeller. The integral stainless
steel pump-motor shaft is sealed
by two mechanical seals with
an oil chamber between the seals
to provide lubrication for both
seal faces.
A radial sleeve bearing, lubricated
by the oil in the seal chamber, is
located between the seals and
takes the radial load from the
pump impeller and cutter blades.
The motor winding, rotor, and ball
thrust bearing are mounted in a
housing sealed and filled with oil
to lubricate the bearing and
transmit the heat from motor
winding to outer shell. The ball
thrust bearing is held in a movable
cap so that the axial cutter and
cutter ring clearance can be
adjusted from the outside without
the use of shims.
The power cord is sealed into the
motor housing with a cord grip,
and the individual conductors are
sealed into the cord cap with
epoxy sealing compound.
Application:
These pumps are designed for
either home or industrial sewage
discharge applications with a pH
ranging from 6 to 9, specific
gravities from 0.9 to 1.1,
viscosities ranging from 28 to 35
S.S.U., and temperatures up
to 140°F.
General
Information
Pump
Information
Codes:
All local wiring codes must be
observed. Consult the local
inspector before installation to
avoid costly delays that can
occur due to rejection after job
is finished.
Installation
Instructions
Location:
If pumps are installed in an
existing basin or concrete sump,
the piping can either be connected
permanently or rails and brackets
can be furnished for mounting to
walls of basin. In either case, be
sure that the Hydromatic non-clog
check valve is used and that the
pumps are submerged in a vertical
position. The complete factory
built packaged system is
recommended for the most
satisfactory installation and
generally for the lowest cost
where expensive installation labor
is involved.
Electrical Connections:
Make all connections from motor
to control panel to comply with
local codes.
CAUTION: Be sure ground
wire is connected to a good
ground such as a water pipe.
This is important for safety.

3
Starting the Pump:
To start the pump, perform the
following steps in order:
1. If pump is 3 phase, the rotation
of the impeller must first be
checked. Lift pump from
sump, lay it down, and quickly
turn pump on and then off.
The impeller should turn
counterclockwise when viewed
from the suction. If rotation is
wrong, turn off main breaker
and interchange any two line
leads to motor to correct
rotation.
If the pump is piped-in
permanently and inlet cannot
be observed, rotation will have
to be checked by pump
operation described later.
If pump is single phase, no
rotation check is necessary.
2. Run water into sump until
motor is covered.
3. Open gate valve in discharge
line.
4. Turn pump on. If pump runs
and sump liquid does not pump
down, stop pump and close
discharge gate valve. Then lift
pump until sealing flange is
open to vent off trapped
air. Lower pump, open
discharge valve, and start the
pump again.
If the pump is piped in
permanently, it may be
necessary to break union at
pump discharge to clear air.
5. If pump is 3 phase, piped-in
permanently, and still does not
operate properly after venting,
rotation is wrong and can be
reversed by interchanging any
two line leads.
6. Level controls should be set so
that pump turns off when level
is about 2 inches above inlet
and turns on when level is
about 2 inches above motor.
CAUTION: Be sure ground
wire is connected to a good
ground such as a water pipe.
This is important for safety.
Pump
Maintenance
Pump
Operations
Axial Cutter Adjustment:
To maintain the proper face
clearance between the axial cutter
(5) and the cutter ring (6), follow
this procedure:
1. Close gate valve at pump
discharge.
2. Turn off circuit breaker.
CAUTION: Never work on
pump unless power has been
turned off.
3. Remove pump from sump.
4. Referring to Figure 1, loosen
jam nuts (41) on set screws
(48) located on top of bearing
housing (9).
5. Loosen set screws (48).
6. Tighten hex head capscrews
(32) until axial cutter (5) just
drags on cutter ring (6)
when radial cutter (4) is
turned by hand.
7. Back off on hex screws
(32) 1⁄8turn.
8. Tighten setscrews (48) to lift
axial cutter (5) for proper
face clearance.
9. Tighten jam nuts (41) on
setscrews (48).
10.Again turn radial cutter (4) by
hand to determine if shaft has
any drag.
11.If there is still some drag,
repeat above steps and back off
hex screws (32) further.
IMPORTANT: Be sure that
both hex screws (32) are
tightened or loosened the same
amount and that the setscrews
(48) are tight against the motor
housing (8). Also, remember that
the setscrews (48) increase the
clearance while the hex screws
(32) decrease the clearance.
Replacing Grinder Parts:
If necessary to replace grinder
parts because of wear or to inspect
for clogging, refer to Page 7.
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. Unscrew capscrews (40) and
remove cutter ring retainer (1).
5. Unscrew hex head capscrews
(35) and remove volute case
(2). Cutter ring (6) can now be
removed from volute (2). Keep
both shims (22) for reassembly
as necessary.
6. Radial cutter (4) and axial
cutter (5) are now exposed.
If checking for clogging, these
parts can now be cleaned
without removing them from
the shaft.

4
7. If necessary to replace cutters,
remove capscrew (36), washer
(13), and radial cutter (4)
from shaft.
Radial cutter (4) and impeller
(3) are screwed onto shaft. The
thread is right-hand. Tap radial
cutter (4) with plastic hammer
if necessary to loosen. Axial
cutter (5) lifts off impeller (3)
and is held from rotating by
pin (20). Unscrew impeller (3)
from shaft in the same manner
as radial cutter (4), and remove
washer (52).
8. Clean all parts thoroughly
before proceeding with the
assembly. Make sure spring
pin (20) is inserted into
impeller (3). Replace case (2)
but do not replace grinder ring
(6) at this point.
9. Loosen hex head capscrews
(32) 1⁄2turn. Replace shims
(22) and cutter ring (6) and
cutter retainer ring (27). Now
repeat steps 4 thru 11 under
Axial Cutter Adjustment. It
may be necessary to loosen
hex head capscrews (35) in
pump case (2) and tap with
a hammer to get proper
clearance on O.D. of radial
cutter (4).
10.Plug pump into power and
operate for a few seconds
only to be sure parts are
not rubbing.
Replacing Seals:
1. Remove pipe plug (61) from
top of motor and from seal
chamber and drain out all oil.
The lower pipe plug drains the
seal housing while the other
drains the motor 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 1500
volts for 230 volt motors and
2000 volts for 460 volt motors
should be performed.
2. Remove cutters, impeller
and pump parts as described
above under “Replacing
Grinder Parts.”
3. Remove socket head capscrew
(37) in seal plate (10) and
screw two of the screws into
the tapped back-off holes to
force seal plate (10) from seal
housing (7). Pulling this plate
(10) off will also force lower
seal (18) from shaft. Remove
lower seal (18) from seal
plate (10).
4. Remove snap ring (17) and
pull upper seal (16) 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
parts with new parts will cause
immediate seal failure.
5. When cleaning all parts before
replacement, check to be sure
sleeve bearing or shaft is not
worn. Be sure all O-rings are in
excellent condition without
cuts or nicks, and replace them
if not in excellent condition.
Use O-ring lube to prevent
cutting at assembly.
6. After all parts are replaced and
before final assembly of
impeller and cutters (step 8 of
“Replacing Grinder Parts”)
refill seal chamber and motor
chamber with oil. Lay pump
on side to fill seal chamber.
Do not fill completely; allow
about 1⁄2inch below fill plug so
that there will be an air space
for expansion. Set pump
upright, and replace the upper
drain plug (47) in the side
before filling motor chamber.
Again fill so that oil level is
just over the top of winding to
allow air space for expansion.
7. Use only Hydromatic
submersible oil in motor
chamber and seal chamber. In
an emergency, a high grade
transformer oil can be used.
Replacing Motor Stator:
1. If necessary to replace stator,
completely dismantle pump as
described above.
2. Remove bearing housing (9)
and shaft rotor assembly (15).
When cap and rotor are
removed, motor leads can be
disconnected through the
bearing cap bore. The leads
are connected with twist-on
wire nuts. Do not tape leads
when replacing stator as oil
will deteriorate the tape and
cause motor failure. Use only
twist on wire nuts.
3. If cord leads are burned,
it may be necessary to
replace power cord and cord
grip assembly.
4. Remove motor housing bolts
(35) and lift off housing (8).
5. Remove stator screws (39) and
set housing (8) on hardwood
blocks. Bump housing (8) up
and down on hardwood block
to loosen stator which should
drop out.
Pump
Maintenance

5
6. Thoroughly clean housing (8)
and other parts and install
new stator.
7. Connect leads through housing
bore and tuck leads back
behind the stator windings to
prevent rubbing on rotor. Use
only twist on wire nuts to
connect wires.
8. If the ball bearing (57) is
rusted or feels rough when
turned, it should be replaced.
Remove hex head capscrews
(31), lockwashers (44), retainer
plate (56) and pull the bearing
(57) and rotor assembly (15)
from the bearing cap (9).
Remove hex head capscrew
(59) and washer (58) and press
the bearing off the shaft. Install
the new bearing by pressing on
inner face only. Pressing on
the outer face will ruin
the bearing.
9. In reassembly replace any
O-rings that are defective. Use
Parker O-ring Lub on all O-
rings for easy assembly and to
prevent cutting.
10.Completely reassemble and fill
with oil as described under
Replacing Seals.
11.Always run pump for a few
seconds after assembly work
to be sure all parts run
smoothly and are correctly
adjusted before replacing in
sump. Check again for correct
rotation. Pump should rotate
counterclockwise when viewed
from the suction.
NOTE: When applying power,
be sure the pump is restrained
from turning by holding the
pump at the motor housing, or
by clamping it in a holding
fixture.
CAUTION: Always keep hands
away from the pump cutter area
after the circuit breaker is
reconnected.
Pump
Troubleshooting
Below is a list of troubles and
their probable causes.
No liquid delivered
1. Pump air bound
2. Discharge head too high
3. Pump or piping plugged
4. Wrong rotation
5. Speed too low
Insufficient liquid delivered
1. Discharge head too high
2. Impeller or cutters partially
plugged or damaged
3. Wrong rotation
4. Incorrect diameter impeller
5. Speed too low
Insufficient discharge pressure
1. Wrong rotation
2. Air or gases in liquid
3. Impeller damages
4. Incorrect impeller diameter
5. Speed too low
Pump overloads motor
1. Wrong rotation
2. Specific gravity or viscosity of
liquid too high
3. Speed too high
4. Head lower than rating,
pumping too much liquid
5. Pump clogged
6. Defective bearings
7. Defective impeller
Pump is noisy
1. Defective bearings
2. No axial clearance between
impeller and volute
3. No axial clearance between
cutter ring and axial cutter
4. No diametral clearance
between radial cutter and
cutter ring
If the cause of the trouble cannot
be determined and corrected as
outlined above, contact your
nearest factory representative.