Zoeller 71 Series Operating instructions

SECTION: Z4.20.150
ZM1788
1120
Supersedes
0714
NOTICE TO INSTALLER: Instructions must remain with installation.
Since 1939 the name Zoeller®has represented the standard for
submersible dewatering and sewage pumps. The same high quality
workmanship and easy maintenance design has been incorporated
into this line of heavy-duty submersible grinder pumps.
This manual incorporates the parts list and repair instructions into
one document to aid in the ownership of a Zoeller®submersible grinder
wastewaterproduct.Pleasereadandreviewthismanualbeforerepairing
REPAIR MANUAL
71 SERIES SUBMERSIBLE GRINDER UNITS
Table of Contents
Safety Instructions ....................................................................... 1
Replacement Parts List ............................................................2-3
Disassembly Procedures............................................................. 4
Assembly Procedures...............................................................5-6
Pump Wiring Diagrams................................................................ 7
Service Checklist.......................................................................... 8
Safety Instructions
TO AVOID SERIOUS OR FATAL PERSONAL INJURY OR MAJOR
PROPERTY DAMAGE, READ AND FOLLOW ALL SAFETY
INSTRUCTIONS IN THIS MANUAL AND ON THE PUMP.
THIS MANUAL IS INTENDED TO ASSIST IN THE INSTALLATION
AND OPERATION OF THIS UNIT AND MUST BE KEPT WITH
THE PUMP.
This is a SAFETY ALERT SYMBOL.
When you see this symbol on the pump or in the
manual, look for one of the following signal words
and be alert to the potential for personal injury or
property damage.
Warns of hazards that WILL cause serious personal
injury, death or major property damage.
Warns of hazards that CAN cause serious personal
injury, death or major property damage.
Warns of hazards that CAN cause personal injury
or property damage.
INDICATESSPECIALINSTRUCTIONSWHICHARE
VERY IMPORTANT AND MUST BE FOLLOWED.
THOROUGHLY REVIEW ALL INSTRUCTIONS AND WARNINGS
PRIOR TO PERFORMING ANY WORK ON THIS PUMP.
MAINTAIN ALL SAFETY DECALS.
CAUTION
Short Term Storage
PLEASE FURNISH THE FOLLOWING INFORMATION:
• Model Number
• Part Number of Pump
• Serial Number
• System Voltage
• Replacement Part Number and Description. (refer to pages 2 & 3)
To Order Replacement Parts
the product. Follow the steps and procedures listed on ZM1074 for a
proper start-up upon installation. Many items contained within, when
followed correctly, will not only ensure a long and problem-free life for
the pump, but also save time and money during installation. Reference
ZM1789 for owner’s manual on 71 Series Pumps. Should further
assistance be necessary please call our Product Support Department
at 1-800-928-PUMP (7867).
Storage of six months or less will not damage the submersible pump.
However, to ensure the best possible protection, the following is
advised:
•Store pump inside whenever possible or cover with some type of
protective covering.
• Tape or seal in plastic bag the terminal ends of wire leads.
• Spray coat unpainted surfaces with rust-inhibiting oil.
• See ZM1789-Owner’s Manual before start-up.
MAIL TO: P.O. BOX 16347 • Louisville, KY 40256-0347
SHIP TO: 3649 Cane Run Road • Louisville, KY 40211-1961
[phone] • 1 (800) 928-PUMP • FAX [phone]
Visit our website:
zoellerengineered.com
Product information presented
here reects conditions at time
of publication. Consult factory
regarding discrepancies or
inconsistencies.
© Copyright 2020 Zoeller®Co. All rights reserved.

2
© Copyright 2020 Zoeller®Co. All rights reserved.
2
1
3
4
5
6
8
9
1
2
10
11
3
13
14
15 16
17
18
19
1
18
20
24
21
21
23
22
25
26
27
28
40
25
29
30
34
36
7
12
37
38
39
37
35
31
3
32
33
ZEPA0499

3
© Copyright 2020 Zoeller®Co. All rights reserved.
ZEPA0514
CUTTER AND IMPELLER CLEARANCE DIAGRAM
71 SERIES GRINDER PARTS LIST
NO SHIM REQUIRED FOR HIGH FLOW
SHIM TO .030 FOR HIGH HEAD AND REVERSING
SHIM TO
.004 TO .008
RUN CLEARANCE
*015261 moisture sensor kit; one kit required per pump.
NUMBER DESCRIPTION QTY. PART NO.
1 PLUG 3 011162
2 SCREWS 8 006451
3 WASHER, LOCK 12 004497
4 COVER 1 (see job folder for BOM) small or large power cord hole.
5 CORD SEAL 1 (see job folder for BOM) 12 or 8 ga.
6 CORD AND CLAMP ASSEMBLY 1 (see job folder) 12 or 8 ga. (013565, 013567)
7 WASHER, LOCK 4 002255
8 SCREWS, CORD CLAMP 4 004416
9 SEAL, COVER 1 011157 (standard buna see job folder)
10 THRU WALL TERMINALS, POWER 3 (see job folder for BOM)
11 THRU WALL TERMINALS, SENSORS 4 003402
12 MOTOR HOUSING AND STATOR 1 (see job folder for BOM) note: moisture sensor wire must be installed.
13 BEARING, UPPER 1 010069
14 ROTOR 1 (see job folder for BOM)
15 KEY, IMPELLER 1 012528
16 BEARING, LOWER 1 012516 (note special instructions for installing this bearing the correct directions.)
17 MOISTURE SENSORS 1 015261 (moisture sersor and wire kit)*
18 SEAL, MTR HSG. / SEAL RETAINER 2 011158 (standard buna see job folder)
19 ADAPTER HOUSING 1 012513
20 ROTARY SEAL, UPPER 1 008165 (standard carbon/ceramic see job folder for BOM)
21 SNAP RING 2 013633
22 SCREW, SEAL RETAINER 4 007774
23 SEAL RETAINER 1 012511
24 ROTARY SEAL, LOWER 1 008165 (standard carbon/ceramic see job folder for BOM)
25 SHIM PACK 1 013568
26 IMPELLER 1 (see job folder for BOM)
27 SEAL, PUMP HOUSING 1 006478 (standard buna see job folder)
28 PUMP HOUSING 1 (see job folder for BOM)
29 CUTTER PLATE 1 155917
30 CUTTER 1 013570
31 CUTTER PLATE SCREWS 8 012529
32 CUTTER/IMPELLER WASHER 1 006454
33 LOCK WASHER 1 004497
34 CUTTER/IMPELLER SCREW 1 013368
35 LEGS 3 013335
36 FEET 3 006489
37 OIL 2 008419 (requires (2) one gal. cans)
38 PRELOAD SPRING 1 012595 (after manufactures’s Date 2/2000)
39 MOISTURE SENSOR WIRES 1 011160 (see job folder for BOM)
40 SCREWS 4 012860

4
© Copyright 2020 Zoeller®Co. All rights reserved.
Disassembly Procedures
DISASSEMBLY PROCEDURES
A. Before you begin...
1. Shut off pump.
2. Disconnect power source.
3. Remove pump from system.
B. When removing cutter (30)...
1. Complete Section A.
2. Immobilize the cutter (30) by placing an brass or aluminum rod in one of
the holes in the cutter plate (29). Turn the cutter until it is against the rod
in the correct direction to remove the cutter screw (34).
NOTE: It may be necessary to heat the hex head screw with a propane torch
to soften the thread compound.
CAUTION
Do not chip or nick the cutter while using the rod to immobilize
the cutter.
3. Using a socket remove the cutter screw (34) and washers (33) (32).
4. Remove the cutter (30).
5. Remove the cutter shims (25).
NOTE: Count the number of shims removed so the same number and sizes
can be installed upon reassembly.
C. When removing cutter plate (29)
1. Complete section A and B.
2. Remove the eight cutter plate screws (31) and remove the cutter plate
(29).
D. When removing impeller (26)...
1. Complete Sections A and B.
2. Remove four screws (40) and lockwashers (3) from pump housing (28).
3. Remove pump housing (28) and gasket (27) from adapter housing (19).
4. Using two pry bars, carefully pry the impeller (26) from the shaft.
5. Remove the impeller shims (25).
NOTE: Count the number of shims removed so the same number and sizes
can be installed upon reassembly.
6. Remove the square key (15) from the shaft.
E. When removing rotary seals (20 & 24)...
1. Complete Sections A, B and D.
Pump should be at room temperature. Seal and motor housing
may be pressurized. Care should be used in removing pipe plugs (1) so
that oil is not sprayed.
CAUTION
Do nottouchsealing faceof therotating sectionor thestationary
section of the rotary seal (20 & 24) when removing or installing seal. When
seal replacement should be done in shop atmosphere if possible.
2. Remove lower snap ring (21) from shaft.
3. Remove the spring holder and seal spring of the lower rotary seal (24)
from the shaft. See rotary seal component placement diagram for part
identication.
4. Remove the pipe plug (1) in the side of the adapter (19) and drain the oil
from the chamber with the pump laying on it’s side.
5. Remove the four socket head screws (22) from the seal retainer (23).
6. Use two screw drivers to lightly pry the seal retainer (23) from
the adapter (19). The remaining parts of the lower seal assembly will also
be removed.
7. Press seal seat out of the seal retainer (23).
8. Remove the seal ring (18) from the seal retainer and inspect for
damage.
9. Slowly remove the oil plug (1) from the side of the motor housing (12)
(see warning above).
10. Turn the pump on it’s side to drain the motor chamber oil.
11. Remove the upper seal snap ring (21) from the shaft and remove the spring
holder and seal spring of the upper rotary seal (20) from the shaft.
12. Using a bearing puller or other suitable tools, pull the rotating section of the
upper rotary seal (20) from the rotor shaft. If needed, carefully pry rotating
section loose and pull off by hand.
13. The stationary seal can be pried with a screw driver. Be careful not
to chip as chips may fall into motor.
NOTE: If the adapter and motor housing are going to be separated to work
on the motor it may be easier to do so before removing the upper seal. When
the rotor and bearing are pulled from the adapter it will strip the seal off the
shaft on the lower side.
F. When removing the power and sensor cord assembly (6)...
1. Complete section A.
2. Remove the four screws (2) and lock washers (3) that secure the cover
(4) to the motor housing (12).
3. Pry the cover (4) off using two pry bars.
4. Remove the power and sensor cord lead connections from the through
wall terminals (10) and (11) in motor housing (12). Set cover and cord
assembly aside.
5. Remove seal ring (9) from the cover and inspect for damage.
6. To remove cord assembly. Remove four screws (8) and lock washers (7).
7. Using a small pry bar, pry around the edges of the cord clamp area of
the cord and clamp assembly (6) to loosen it.
8. Remove the ground screw and disconnect the ground wires from the
inside of the cover (4).
9. Pulling on the power leads on the inside of the cover, remove the cord
and clamp assembly (6) and seal (5) from the cover. The entire length of
the power and sensor cords will be pulled through the cover.
NOTE: It may take some wiggling and prying to loosen this assembly, because
the rubber seal (5) will have taken a set.
10. Inspect the cord seal (5) for damage.
G. When removing motor rotor (14)...
1. Complete sections A, B, C, D and E. Section C and F may or may not
be completed rst. If the cord and cover assembly has been removed,
two 3/8" eye bolts will be required when lifting the motor housing and stator
off the unit.
2. Place pump vertical on the work surface. The pump must be blocked or
set back in pump housing to allow shaft to extend out the bottom.
3. Remove four screws (2) and lockwashers (3) between motor housing
(12) and adapter (19).
4. Lift the motor housing and stator (12) up off the adapter (19), high enough
to reach the moisture sensor wires (39) and unplug terminals from moisture
sensors (17).
5. Finish lifting the motor housing (12) off the adapter (19). Be careful to lift
the motor housing straight up, so as not to damage the stator windings or
bearings.
6. Remove seal ring (18) from adapter (19) and inspect.
7. Remove bearing pre-load washer (40) from motor housing (12) and
inspect.
8. Remove rotor assembly (14) from adapter (19).
9. Using a bearing puller, against the inner race, remove the lower bearing
(16) and upper bearing (13) from the shaft. Replace the bearings if needed.
NOTE: Bearings should be cleaned with volatile mineral spirits and relubricated
with proper lubricants immediately after cleaning. Never dry bearings with
compressedair, and neverspin un-lubricated bearings. Seespecial instructions
for direction of lower bearing installation.
H. Motor Stator...
NOTE: The motor housing and stator assembly removed in Section G number
5, is a factory assembled unit and must be replaced as such: it consists of the
motor housing, the glued in stator, the through the wall electrical terminals for
the power, and the moisture sensor wires.
I. Removing Sensor Studs...
1. Complete Section A, Section E #10, and Section G #5.
2. Unscrew moisture sensors (17) from the adapter (19).
ASSEMBLY PROCEDURES
Pumpsare reassembledin reverseorder ofdissemble.The followingsuggestions
are offered.
NOTE: While the pump is dismantled, all gaskets, seal rings and retaining
rings should be checked for wear and deterioration. Replace all worn items.
Ensure that all parts are thoroughly cleaned before assembly.

5
© Copyright 2020 Zoeller®Co. All rights reserved.
Assembly Procedures
A. Installing the sensor studs (17)...
1. Apply oil to threads of sensor studs (17).
2. Apply oil into threaded holes in adapter (19).
3. Screw sensor stud (17) into adapter (19) apply 34 in/lbs. of torque.
B. Assembly of rotor (14)...
1. Inspect rotor to see that the snap ring is in place and snapped in the groove.
This snap ring serves as a locator for the lower bearings.
NOTE: Before installing the bearing, wipe the bearing seats on the shaft clean
and coat the seats with oil to prevent galling of the shaft as the bearings are
pressed onto the shaft. Aproperly sized pressing sleeve should be used to install
bearings, with pressure being applied to only the inner bearing race.
2. Install the lower ball bearing (16) and the upper ball bearing (13) on the
rotor shaft (14). See lower angular contact bearing instruction page 6 for
bearing orientation.
3. Set the adapter (19) on blocks to allow the rotor shaft to clear the work
surface when installed.
4. Install the rotor/bearings assembly into the adapter housing (19). Make
sure the lower bearing is seated in the bearing pocket.
C. Installing the motor housing/stator (12)...
NOTE: The motor housing/stator assembly is furnished from the factory as a
glued in unit. The assembly will include the motor housing, the stator prewired
to installed through wall terminals (10) and moisture sensor wires (41).
1. Lightly oil and position the seal ring (18) around the pilot shoulder of the
adapter (19).
2. Install the pre-load washer (38) in the upper bearing pocket of the housing/
stator unit (12). The pre-load washer should be stretched a little to allow it
to remain in the pocket when turned upside down.
3. With the rotor/adapter assembly in the vertical position suspend the motor
housing/stator unit over it. Slowly lower the unit aligning the rotor and stator
opening. Plug the moisture sensor wires (39) onto the sensors (17) at this
time.
4. Tuck the moisture sensor wires away from the rotor while lowering the motor
housing/stator unit into place on the adapter.
5. Secure the motor housing/stator (12) to the adapter (19) with four screws
(2) and four lock washers (3). Torque screws to 175-195 in/lbs.
NOTE: The small arrow heads on housing anges are to be aligned for proper
orientation.
D. Installing cord and cover assembly...
NOTE: The cords will come from the factory as a cords and clamp assembly (6).
The assembly consist of the power cord, the sensor cord, the wire terminals, the
clamp and the potting compound between the cords and clamp.
1. Unroll the cords of the cord and clamp assembly (6) and slide the cord seal
(5) down the cords to the clamp.
2. From the inside of the cover (4) place the cords of the assembly (6) through
the holes and pull through the top.
3. Push the cord seal (5) into it’s pocket inside the cover (4). Push the clamp
(6) tight against the seal.
4. Apply thread locker compounds to the screws (8) and install into clamp
along with lock washers (7). Using a cross pattern tighten the screws to the
seal clamp evenly. Torque screws to 69-72 in/lbs.
5. Apply thread locker compound to ground screw and install ground wires to
cover.
6. Lightly oil and install seal ring (9) on shoulder of cover (4).
7. Suspend the cord and cover assembly over the motor housing and make
wiring connections per the proper wiring diagram.
NOTE: The power wiring goes to the numbered terminal, the moisture sensor
to M1 and M2 and the thermosensor to T1 and T2.
8. Tuck the wires in the cover assembly as installing the cover into place.
9. Secure the cover (4) to the motor housing (12) with four screws (2) and
four lock washers (3). Torque screws to 175-195 in-lbs.
NOTE: The small arrow heads on the castings are to be aligned for proper
orientation.
E. Installation of rotary seals and seal retainer
CAUTION
Make sure all seal faces remain free of dirt particles.
Apply a light coat of oil to seal faces before installing.
1. Refer to rotary seal component placement diagram for relative
positioning of seal parts.
2. Apply a coating of oil to the seal seat and the bore of the adapter
(19), and using a nonmetallic sleeve, press the seat into position in
the adapter.
ROTARY SEAL COMPONENT PLACEMENT
DIAGRAM
3. Apply 80-90 weight gear oil to the shaft and to the inside diameter of
the rotating section of rotary seal (20). Push the rotating section onto
the shaft in a continuous motion until the seal faces meet.
4. Install the spring and spring holder over the shaft and seat against the
rotating section. Compress the spring as necessary and install retaining
ring (21) in the groove of the rotor shaft.
5. Lightly oil and install seal ring (18) on the seal retainer (23).
6. Press the seal retainer (23) into the adapter (19) and secure with the
four socket head screws (22).
7. Install the seal seat and rotating section of the lower rotary seal assembly
(24) into the seal retainer (23) in the same manner described in steps 2,
3, and 4 above.
F. Installing the impeller...
1. Install the proper number of impeller shims (25) on the shaft to give the
face of the impeller (26). The proper running clearance from the pump
housing (28). (See impeller clearance diagram on page 3.)
2. Install the square key (15) in the groove in the shaft.
3. Install the impeller (26).
G. Installing the pump housing (28)...
1. Lightly oil and install the seal ring (27) on the adapter (19).
2. Install the pump housing (28) on the adapter (19). Securing it with the
four screws (2) and lock washers (3).
3. Torque screws to 175-195 in/lbs.
Note: Cutter plate and cutter can be replaced with new service parts or
resurfaced by grinding. Resurfacing is accomplished by surface grinder
both cutter plate and cutter to a 32 micro nish. Do not attempt grinding in
the eld. Send parts to a qualied machine shop or return to the factory for
repair. The cutter plate and cutter shims are a matched set. Keep parts
together. Measure disc before and after resurfacing, the cutter plate and
cutter must be at within 0.001". If the plate has been surface ground, it
will be necessary to remove shims to compensate for the material removed
SEAL SEAT
SPRING
SNAP RING
SPRING
ROTATING
SECTION
HOLDER
ZEPA0194

6
© Copyright 2020 Zoeller®Co. All rights reserved.
form the plate plus any amount over 0.008" measured in the eld before the
cutter and plate were disassembled from the pump.
H. Installing the cutter plate (29)...
1. Carefully clean the area of pump housing (28) where the cutter plate (29)
will be installed.
2. Install cleaned cutter plate (29) on the pump housing (28) with eight cutter
plate screws (31).
Note: When the cutter plate is installed in the proper direction the eight radial
relief slots will be facing out towards the cutter.
I. Installing the cutter (30)...
1. Install the proper amount of shims (25) on the shaft to obtain the proper
running clearance between the cutter plate (29) and cutter (30).
2. Install the cutter (30) onto the shaft.
3. Install the screw (34), lockwasher (33) and at washer (32) using thread
locking compound and torquing to 175-195 in/lbs.
Note: Immobilize the cutter by placing a aluminum or brass rod in one of the
holes in the cutter plate.
CAUTION
Do not chip or nick the cutter while using the rod to immobilize
the cutter.
4. With the pump in the vertical position to remove end play, measure the
running clearance between cutter (30) and cutter plate (29) using a feeler
gauge. Repeat 1 thru 3 until .004" to .008" clearance is obtained. (See
cutter clearance diagram on page 3).
Leak Test
(Before oiling pump) Perform a leak test on the pump seals by installing a
regulated air supply into the holes (1/4" NPT access). The motor chamber,
seal chamber and cover chamber must be checked. The pressure of the
air supply should be set at approximately 9 PSI. Submerge the pump in
clear water watching for small air bubbles around square ring seals, rotary
seal, cord connection, and oil ll plugs.
NOTE: Make certain that the pump is placed in the water so that no areas are
present that would trap air (such as the cavity around the lower rotary seal),
not allowing the bubbles to rise to the water surface.
If it is not possible to leak test the pump using the submersion method, a
regulated air supply with a (0-15 PSI) air gage can be installed in the ll
holes. The pump to be pressurized and held at 9 PSI. After removing the
air supply, the pressure should not drop more than 1/2 PSI in a 24 hour
period.
J. Oilingandnalassembly.
1. After leak testing has been completed, clean pipe plugs and reapply pipe
dope or teon tape. Install pipe plug (1) in cover (4).
2. With the pump laying on its side with the oil ll hole up ll the seal chamber
cavity with an anti-wear non-detergent, rust inhibiting, parafning oil of
approximately 100 SUS. (See table below for acceptable type of oil.)
  Rener ProductName
Arco Duro 22 or 32
Exxon Teresstic 22 or 32 or acceptable equal
Chevron Clarity Hydraulic Aw ISO22 or ISO32
3. Clean pipe plugs and reapply pipe dope or teon tape. Install pipeplug
(1) in adapter (19).
4. While pump is on it’s side place approximately one quart of oil in motor
housing. (Use the same oil as used in the seal cavity.)
5. Set the pump upright and nish lling the motor chamber with oil until it
Assembly Procedures (continued)
ANGULAR CONTACT BEARING TO BE ORIENTED
SUCH THAT THE FLANGED OR THICKER SIDE
OF THE INSIDE RACE FACES UP AND MATES
AGAINST SNAP RING.
ZEPA0515
LOWER BEARING ORIENTATION
runs back out the ll hole. With the oil running out the ll hole the oil will be
at the proper level for the top bearing.
Donotoverll.
6. Clean pipe plug and reapply pipe dope or teon tape. Install pipe plug (1)
in motor housing (12).

7
© Copyright 2020 Zoeller®Co. All rights reserved.
21
5
WHITE
PUMP
START
MAIN
BLACK
L2
WHITE
BLACK
RUN CAPACITOR
RED
START CAPACITOR
L1
T2T1
3
2
1
GREEN
230 VAC 1ø
(SEE CHART) (SEE CHART)
7110/7111
MODELS
270-324UF 250V
START CAP. RUN CAP.
50UF 370V
R
RELAY
START
START WINDING
MAIN WINDING
MOTOR
BLACK OR WHITE BLACK OR WHITE
THERMOSTAT
CHAMBER
SEAL
CHAMBER
MOTOR
POWER CORD
M2M1T2T1
PURPLE BROWN
M2M1T2T1
WHITE BLACK ORANGE RED
GREEN
SENSOR CORD
321
321
2 31
CHAMBER
COVER
WHITE RED BLACK
GREEN
330K OHMS RESISTANCE
SENSOR FAILURE PROBES
(BEFORE 6/2000 N/O)
SENSOR FAILURE PROBES
M2
M2
MOTOR
BLACK OR WHITE BLACK OR WHITE
WINDINGS
THERMOSTAT
T1
T1
BROWN
M1
M1
T2
T2
PURPLE
321
3
3
2
2
1
1
CHAMBER
SEAL
CHAMBER
MOTOR
WHITE RED BLACK ORANGE
WHITE
GREEN
RED BLACK
SENSOR CORDPOWER CORD
COVER
CHAMBER
GREEN
330K OHMS RESISTANCE
(BEFORE 6/2000 N/O)
Wiring Diagrams
B00488 B00487
3 PHASE 71 SERIES GRINDER SINGLE PHASE 71 SERIES GRINDER
WIRING COMPONENT LAYOUT
SINGLE PHASE 71 SERIES GRINDER
PART# DESCRIPTION
10-1011 KIT, STARTER MODELS 7110, 7111
012869 CAPACITOR, 50UF / 370 VAC
015155 RELAY, GE 3ARR22J10A2
012870 CAPACITOR, 270-324UF/220-250V
ZEPA0537
START KITS AND COMPONENTS
FOR SINGLE PHASE 71 SERIES GRINDER

8
© Copyright 2020 Zoeller®Co. All rights reserved.
ELECTRICAL PRECAUTIONS Before servicing a pump, always shut off the main power breaker to the panel and then disconnect the pump - making
sure you are wearing insulated protective sole shoes and are not standing in water. Under ooded conditions, contact your local electric company or a qualied licensed
electrician for disconnecting electrical service prior to pump removal.
Submersible pumps contain oils which become pressurized and hot under operating conditions - allow 2½ hours after disconnecting before attempting service.
CONDITION
A. Pump will not start or run.
COMMON CAUSES
B. Motor overheats and trips overload or blows fuse.
- Incorrect voltage
- Unbalanced power source
- Incorrect motor rotation
- Negative or low head
- Excessive water temperature
- Impeller or seal mechanically bound
- Defective capacitor or relay
- Motor shorted
- Lost one line in a three phase unit
C. Pumps starts and stops too often.
- Check valve stuck open
- Level controls out of adjustment
- Temperature sensor tripping
- Thermal overload switch out of adjustment or defective
- Pit too small
D. Pump will not shut off.
- Debris under oat switch
- Float travel obstructed
- Defective or damaged oat switch
- Magnetic starter contacts shorted
- Air lock - check vent hole
E. Pump operates but delivers little or no water.
- Check for plugged pump housing, discharge
pipe or sticking check valve
- Vent hole clogged or not drilled
- Discharge head exceeds pumps capacity
- Low or incorrect voltage
- Incorrect motor rotation
- Defective capacitor
F. Drop in head and/or capacity after a period or use.
- Increased pipe friction
- Clogged line or check valve
- Abrasive material & chemical,
deteriorated impeller and pump housing
If the above check list does not uncover the problem, consult the factory - Do not attempt to service or otherwise disassemble pump.
Steps Check Voltage At If No Voltage If Voltage
No. 1 Line terminals in pump's Check Disconnect switch, line Proceed to No. 2
control panel fuse, and/or circuit breakers
L1- L2- L3(3 Phase) in power supply circuit.
No. 2 Pump motor terminals in Check for control circuit Check starting relay
pump’s control panel voltage. Check out magnetic and capacitor (1 phase units).
T1- T2- T3starter contacts, thermal Check pump for ground
overloads, and oat switches and binding impeller
Service Checklist & Trouble Shooting