Taco VM0102 User manual

INSTALLATION AND OPERATING INSTRUCTIONS
VERTICAL MULTISTAGE PUMPS
Single and Three Phase 60 Cycle
Record the following information from the motor and pump
nameplates for future reference:
Pump Model No.
Bill of Material No.
Motor Model No.
Motor Serial No.
H.P. Volts/Hz/Ph
Rated Amp Draw
Taco, Inc.
1160 Cranston Ave., Cranston, RI 02920
BE807-TACO (12/5/06)

TABLE OF CONTENTS
Safety Instructions..............................................................2
Applications and Operating Ranges................................2-4
Installation......................................................................4-5
Electrical.........................................................................5-6
Operation.......................................................................6-7
Maintenance ................................................................8-11
Repair Parts ................................................................12-13
Troubleshooting Guide....................................................14
Warranty .........................................................................14
Carefully read and follow all safety instructions
in this manual or on pump.
This is the safety-alert. When you see this symbol on
your pump or in this manual, look for one of the
following signal words and be alert to the potential for
personal injury.
warns about hazards that will cause serious
personal injury, death or major property damage if ignored.
warns about hazards that can cause serious
personal injury, death or major property damage if ignored.
warns about hazards that will or can cause
minor personal injury or property damage if ignored.
The word NOTICE indicates special instructions which are
important but not related to hazards.
To avoid serious or fatal personal injury and possible
property damage, carefully read and follow the safety
instructions.
1. Install pump according to all code requirements.
2. Compare pump nameplate data with desired operating
range.
3. Pump only liquids compatible with pump component
materials (that is, liquids that will not attack the pump).
4. Make sure plumbing is adequate to handle system
pressure.
5. Periodically perform maintenance inspection on pump
and system components.
6. Wear safety glasses at all times when working on
pumps.
INSPECT THE SHIPMENT
The vertical multistage centrifugal inline pump has been
carefully inspected and packaged to assure safe delivery.
Inspect the pump and fittings and report to the carrier any
items which are damaged or missing.
CONFIRM YOU
HAVE THE RIGHT PUMP
APPLICATIONS AND
OPERATING RANGES
Multistage in-line centrifugal pumps are designed for liquid
transfer, circulation, and pressure boosting of hot or cold
clean water or other thin, non-explosive liquids, not
containing solid particles or fibers, which will not
chemically attack the pump materials.
Typical applications include:
• Municipal water supply and pressure boosting
• Boiler feed and condensate systems
• Cooling water systems
• Irrigation
• Fire fighting
Maximum Ambient Temperature....................104° F(40° C)
Liquid Temperature Range .............................5° F to 250° F
(-15° C to +121° C)
Maximum Permissible
Operating Pressure Curves................................See Figure 4
Maximum Inlet Pressure: ....... Table II shows the maximum
permissible inlet pressure. However,
the actual inlet pressure plus the pressure
when the pump is running against a closed
valve must always be lower than the
“Maximum Permissible Operating Pressure”.
Electrical Data: ..................................See Motor Nameplate
Dimensions and Port to
Port Lengths : ............................See Figures 2 and 3, Page 3
2
VM0102-B B
Vertical Multistage
Nominal Rate of Flow
@ BEPx15 GPM
Number of stages
Hydraulic Version
B = 304SS/CI Flanged
E = 304/CI Threaded
MODEL #
Q(GPM)
BHP(HP)
PART # MFG DATE
H(FEET)
PR. Max (PSI)
SO#
N(RPM)
TEMP (F)
TACO INC., GRAND ISLAND, NEBRASKA 68801
FIGURE 1 - Model Plate Information

3
3"
9-7/8"
3-15/16"
7-1/16"
8-1/4"
3-15/16"
8-1/4"
10"
1-1/4"
NPT
ANSI 250 lb
1-1/4" Flange
1/2" Dia. – 4 Places 3365 0199
E
A
B
C
D
E
A
B
C
D
F F
1/4" NPT
Gauge Tap
3/4" NPT
Vent Plug
Allow Space
to Remove
Motor
1/4" NPT
Gauge Tap
FIGURE 2 - Height, width and baseplate dimensions for VM01
and VM02 Series pumps
11-13/16"
5-1/8"5-1/8"
8-1/2"
9-3/4"
3-1/2"
12-5/64"
2" NPT
ANSI 250 lb
2" Flange
17/32" Dia. – 4 Places 3364 0199
E
B
D
A
C
E
B
D
A
C
F F
9-3/4"
Allow Space
to Remove
Motor
1/4" NPT
Gauge Tap
1/4" NPT
Gauge Tap
3/4" NPT
Vent Plug
FIGURE 3 - Height, width, and baseplate dimensions for VM04
and VM06 Series pumps
Model Dimension in Inches
Number A B C D E F
VM0102 11-3/8 9-1/4 4-7/8 2 22-5/8 6
VM0103 11-3/8 9-7/8 4-7/8 2 23-1/4 6
VM0104 12 11-1/8 5-1/4 2 25-1/4 7-1/8
VM0105 12-3/4 11-1/8 5-3/4 2-1/8 26 7-1/4
VM0106 13-1/2 11-1/8 5-3/4 2-1/8 26-5/8 7-1/4
VM0107 14-1/8 12-1/8 5-3/4 2-1/8 28-1/4 7-1/4
VM0108 14-7/8 12-1/8 5-3/4 2-1/8 29 7-1/4
VM0110 16-5/8 13-5/8 2-7/8 2-7/8 33-1/4 8-1/2
VM0112 18-1/8 13-5/8 6-7/8 2-7/8 34-5/8 8-1/2
VM0115 20-1/4 15-1/4 8 3-3/8 38-7/8 10-5/8
VM0118 22-3/8 15-1/4 8 3-3/8 41 10-5/8
VM0201 11-3/8 9-1/4 4-7/8 2 22-5/8 6
VM0202 11-3/8 9-7/8 4-7/8 2 23-1/4 6
VM0203 12-3/8 11-1/8 5-1/4 2 25-5/8 7-1/8
VM0204 13-1/2 11-1/8 5-3/4 2-1/8 26-5/8 7-1/4
VM0205 14-1/2 12 5-3/4 2-1/8 28-5/8 7-1/4
VM0206 16 13-5/8 6-7/8 2-7/8 32-1/2 8-1/2
VM0207 18-1/8 13-5/8 6-7/8 2-7/8 34-5/8 8-1/2
VM0208 18-1/8 13-5/8 6-7/8 2-7/8 34-5/8 8-1/2
VM0210 20-1/4 15-1/4 8 3-3/8 38-7/8 10-5/8
VM0212 22-3/8 15-1/4 8 3-3/8 41 10-5/8
VM0214 24-1/2 15-1/4 8 3-3/8 43-1/8 10-5/8
VM0216 26-5/8 15-1/4 8 3-3/8 45-1/4 10-5/8
VM0401 15 9-7/8 4-7/8 2 27 6
VM0402 15 11-1/8 5-3/4 2-1/8 28-1/4 7-1/4
VM0403 17-3/4 13-5/8 6-7/8 2-7/8 34-1/4 8-1/2
VM0404 18-7/8 13-5/8 6-7/8 2-7/8 35-1/2 8-1/2
VM0405 20-1/8 15-1/4 8 3-3/8 38-3/4 10-5/8
VM0406 21-1/4 15-1/4 8 3-3/8 40 10-5/8
VM0408 23-5/8 15-1/4 8 3-3/8 42-1/4 10-5/8
VM0410 26 15-1/4 8 3-3/8 44-5/8 10-5/8
VM0412 28-3/8 16-1/2 8-3/4 3-3/8 48-1/4 10-5/8
VM0414 30-3/4 16-3/8 8-3/4 3-3/8 50-1/2 10-5/8
VM0416 33-5/8 19-5/8 9-1/2 4-1/4 57-1/2 13
VM0602 19-1/2 15-1/4 8 3-3/8 38-1/4 10-5/8
VM0603 19-1/2 15-1/4 8 3-3/8 38-1/4 10-5/8
VM0604 21-3/8 15-1/4 8 3-3/8 40 10-5/8
VM0605 23-1/8 16-3/8 8-3/4 3-3/8 42-7/8 10-5/8
VM0606 25-3/8 19-5/8 9-1/2 4-1/4 49-1/4 13
VM0607 27-1/8 19-5/8 9-1/2 4-1/4 51 13
VM0608 28-7/8 19-5/8 9-1/2 4-1/4 52-7/8 13
VM0610 32 21-3/4 9-1/8 4 57-3/4 11-1/2
VM0612 35-3/8 21-3/4 9-1/2 3-1/4 60-3/8 13
TABLE I – Maximum Height and Width Dimensions*
* Measurements represent the largest number possible for each Model.

4
INSTALLATION
Hazardous voltage. Voltage can shock, burn,
or cause death. Ground pump motor correctly before
connecting to power supply, per article 250-80 of the
National Electrical Code (NEC) in the U.S., or the Canadian
Electrical Code (CEC), as applicable.
Location
Locate pump in a dry, well ventilated area, not subject to
freezing or extreme variations in temperature.
Mount pump a minimum of 6” from any obstruction or hot
surface. Install the pump with the motor shaft vertical.
Make sure that an adequate supply of cool air reaches the
motor cooling fan. Maximum ambient air temperature is
104° F (40° C).
For open systems requiring suction lift, locate the pump as
close to the water source as possible.
Foundation
Foundation should be concrete or a similarly rigid
foundation to provide a secure, stable mounting base for
the pump.
Secure pump to foundation using all bolt holes. Refer to
Figures 2 and 3 for bolt plate dimensions. Be sure that all
four pads on the base are properly supported.
Shim pump base to make sure that pump is level.
Piping
Explosion and burn hazard. Do not run
pump with discharge valve closed; the water in the pump
may boil, with risk of explosion and steam burns to
anyone near. If there is any danger of the pump running
against a closed discharge valve, install a pressure relief or
by-pass valve in the discharge pipe to allow for minimum
liquid flow through the pump. Minimum liquid flow
through the pump is needed for cooling and lubrication of
the pump (See Table III). Run the bypass/relief valve and
discharge pipe to a floor drain or a tank for collection.
Suction pipe should be adequately sized (See Table IV) and
run as straight and as short as possible to keep friction
losses to a minimum. Pipes, valves, and fittings must have a
pressure rating equal to or greater than the maximum
system pressure.
Pressure check the discharge piping as required by codes
or local regulations.
“Inlet” and “Outlet” are cast into the pump base to show
the direction of the liquid flow through the pump.
Install anti-vibration mountings on either side of the pump
if a minimum noise level is desired.
Install isolation valves in both inlet and outlet pipes near
the pump. This allows for removal of pump for service
without draining the system and isolation of the pump in
case of a flooded suction condition.
Liquid Temperature
Type +5° F to +250° F
VM01 1 GPM
VM02 2 GPM
VM04 4 GPM
VM06 8 GPM
TABLE III – Minimum Pumping Rates
Type Pipe Size
VM01 1-1/4” Nominal Diameter, Schedule 40 Pipe
VM02 1-1/4” Nominal Diameter, Schedule 40 Pipe
VM04 2” Nominal Diameter, Schedule 40 Pipe
VM06 2” Nominal Diameter, Schedule 40 Pipe
TABLE IV – Minimum Suction Pipe Sizes
FIGURE 4 - Maximum Inlet Pressure and Maximum Permissible
Operating Pressure Curves
0
30
60
90
120
150
180
210
240
270
300
330
360
390
420
212
0 to 100 120 140 160 180 200 220 240
250
260 280
Pressure in PSI
Temperature in Degrees F 3355 1298
TABLE II – Permissible Operating Pressure Curves
Maximum Inlet
Model Number Pressure (PSI)
VM01 02 - 06 145
07 - 18 220
01 - 02 90
VM02 03 - 07 145
08 - 16 220
VM04 01 - 04 90
05 - 16 145
VM06 02 - 03 90
04 - 12 145

If the system pressure is greater than the pumps maximum
inlet pressure the limits of the pump can be exceeded if the
discharge pressure backs up to the inlet side of the pump.
Installation of a check valve in the discharge pipe is
recommended to prevent this condition.
Make sure, especially on the inlet side of the pump, that
there are no airlocks in the system. See Figure 5 for correct
pipe work to avoid airlocks. The suction pipe should be
level or slightly rising.
Support all piping independently of the pump so the weight
of the piping system does not strain the pump case. Make
sure that the expansion and contraction of the piping
system from temperature variations cannot put a strain on
the pump.
If the system or pump must be drained periodically
(especially if the discharge pipe is horizontal or slopes
downward away from the pump), install a loop and
vacuum valve as shown in Figure 6 to protect the pump
against running dry. The highest point of the loop should
be at least as high as the lowest point of the motor. This
loop/valve combination will allow the pump and the
system to be drained independently of one another.
ELECTRICAL
Hazardous voltage. Can shock, burn or
cause death. All electrical work should be performed by a
qualified electrician in accordance with the National
Electrical Code and all local codes and regulations. Make
sure that the motor voltage, phase, and frequency match
the incoming electrical supply. The proper operating
voltage and other electrical information can be found on
the motor nameplate. These motors are designed to run up
to ±10% of the nameplate-rated voltage. The wiring
connection diagram can be found on either a plate
attached to the motor or on a diagram inside the terminal
box cover.
•If voltage variations are greater than ±10% do not
operate the pump.
• Incorrect voltage can cause fire or serious damage to the
motor and voids warranty.
• Ground the pump motor correctly before connecting it
to the power supply.
• Follow the wiring instructions when connecting the
motor to the power lines.
Position of Terminal Box
To turn the motor so that the terminal box faces the right
direction, proceed as follows:
1. Disconnect the power to the pump motor.
2. Remove the coupling guards (use a screwdriver).
3. Remove the couplings.
4. Remove the bolts that fasten the motor to the pump.
5. Turn the motor to the required position (in quarter-turn
increments).
6. Follow steps 10 - 20 under “Motor Replacement”, on
Page 8.
Field Wiring
All wiring connections and wiring sizes must meet National
Electrical Code and local requirements.
5
O.K.
3347 1198
O.K.
FIGURE 5 - Install Pipe Correctly to Prevent Air Locks
3346 1198
Vacuum Valve
FIGURE 6 - Loop and Vacuum Valve Installation

6
Motor Protection
See the motor nameplate for electrical connection/wiring
diagram.
Taco pumps must be used with the proper size and type of
motor starter to ensure protection against damage from low
voltage, phase failure, current imbalances, and overloads.
The overload should be sized to trip at the full-load current
rating of the motor.
OPERATION
Priming
Hazardous pressure. Do not run the pump
with the discharge valve closed; the water in the pump may
boil, causing risk of explosion and steam burns to anyone
nearby.
Hazardous voltage. Disconnect all power to
the pump before servicing or working on the pump. Make
sure that the power is locked out and that the pump cannot
be accidentally started.
NOTICE: Under no circumstances should the pump be
operated without flow through the pump. Never operate
the pump dry.
Operation of closed systems or open systems with the
liquid level above the pump priming plug:
1. Close the discharge isolating valve and loosen the
needle valve in the vented priming plug in the pump
head (Figure 7). Do not remove the needle valve.
Risk of water damage and injury. Watch the
direction of the priming plug and make sure that the liquid
escaping from it does not injure persons nearby or damage
the motor or other components. In hot water installations,
pay particular attention to the risk of injury from scalding
hot water.
2. Slowly open the isolation valve in the suction pipe until
a steady stream of liquid runs out the vent in the priming
port.
3. Tighten the needle valve to 25 inch-pounds torque.
Completely open isolation valves.
NOTICE: Please turn to “Starting”, Page 7, before proceeding
any further.
Operation of open systems with the liquid level below the
top of the pump:
NOTICE: The suction pipe requires a check valve or
isolation valve.
1. Close the discharge isolation valve.
2. Remove the vented priming plug.
3. Pour liquid through the priming port until the suction
pipe and the pump are completely filled with liquid.
4. Replace the vented priming plug and tighten it securely.
5. Repeat steps 1-4 until the pump is primed.
NOTICE: Please turn to “Starting”, Page 7, before proceeding
any further.
No-Flow Operation
This pump must not operate at no flow. To prevent no-flow
operation, install a bypass orifice, sized to allow the
minimum rate of flow to pass the pump at all times (see
Table III). Taco recommends a 3-inch long nipple-style
orifice, which will compensate for erosion and ensure the
correct minimum flow for extended time periods. Inspect
the orifice and bypass loop periodically to make sure that it
is not obstructed, eroded, or leaking and that the correct
minimum flow is maintained. See Table V to select the
correct orifice size for your installation.
Checking Direction of Rotation
NOTICE: Do not disconnect the motor from the shaft to
check the direction of rotation. If you remove the coupling,
then you must adjust the shaft position when you reinstall
it. This must be done before starting the pump.
Arrows on the pump head show the correct direction of
rotation. When seen from the motor fan, the pump should
rotate counterclockwise () . For pump motors without a
fan remove one of the coupling guards and look at the
coupling to determine the direction of rotation. Turn off the
pump and replace coupling guard.
NOTICE: Do not check the direction of rotation until the
pump has been filled with liquid. See “Priming”, at left and
above.
1. Switch power off.
2. Remove the coupling guard and rotate the pump shaft to
be certain it can turn freely. Replace the coupling guard.
3. Verify that the electrical connections are in accordance
with the wiring diagram on the motor.
4. If the fan is visible, turn on and off to verify rotation.
Vented
Priming
Plug
Drain
Plug
Back off needle valve
to vent air. Retighten
to 25 in.-lbs. when vent
port runs a steady stream
of water.
FIGURE 7 - Priming and Drain Plugs
Number Pump Model
of Stages VM01 VM02 VM04 VM06
2 through 6 1/8” 1/8” 3/16” 1/4”
7-8 1/8” 1/8” 3/16” 3/16”
9 through 16 1/8” 1/8” 1/8” 3/16”
17-18 1/8” – – –
TABLE V – Bypass Orifice Chart

5. To reverse the direction of rotation, first switch OFF the
power supply.
6. On three-phase motors, switch 2 of the 3 power leads
on the load side of the starter. On single-phase motors,
see the connection diagram on the motor nameplate.
Change the wiring as indicated.
Hazardous voltage. Voltage can shock, burn
or cause death. Ground the pump motor correctly before
connecting to power supply per article 250-80 of National
Electrical Code (NEC) in the U.S., or the Canadian
Electrical Code (CEC), as applicable.
7. Switch on the power supply and recheck the direction of
motor rotation.
Starting
1. If a suction line isolation valve has been installed, check
to be sure that it is completely opened.
2. For initial starting, the isolation valve in the discharge
pipe should be almost closed.
3. Start the pump.
4. When the piping system has been filled with liquid,
slowly open the discharge isolation valve until it is
completely open. Opening the valve too fast may result
in water hammer in the discharge pipe. If the pump or
system start to rattle, the pump is cavitating; to avoid
damage to the pump, reduce the flow through the
discharge isolation valve until the rattling stops. If this
does not give adequate flow for your installation, call
your installer or system designer.
5. Record the voltage and amperage of the motor. Adjust
the motor overloads if required.
6. If pressure gauges have been installed, check and record
operating pressures.
7. Check all controls for proper operation.
Motor Bearings
For the greasing schedule and greasing procedure of the
motor bearings follow the motor manufacturers
recommendations.
Calculating Minimum Inlet Pressure:
Minimum inlet pressure is required to avoid cavitation in
the pump and is calculated as follows:
H = Pb - NPSHR - Hf- Hv- Hs
H = Minimum Inlet Pressure in Feet of Head
Pb = Barometric Pressure in Feet
1 Bar = 29.92 inches of Mercury (Hg)
1 PSI = 2.31 Ft of Head
1 Bar = 33.5 Ft. of Head
NPSHR = Net Positive suction head required. To be read
from the NPSHR curve, Figure 8, at the highest flow the
pump will be delivering.
Hf= Friction Loss in suction pipe in ft of head
Hv= Vapor pressure in feet of head (See Table VI).
Hs= A safety margin of 1.64 ft of head
Example for VM04:
If: Flow = 60 GPM
Pb = 1 Bar = 29.92 Inches of Mercury*
(Convert from Bar to Feet of Head)
Inches of mercury = 1.33’ inches of mercury
T = 100° F
NPSHR = 10’ (See Figure 7)
Hf= 10’ of 2” Steel Pipe @ 11.9’ of loss per 100’
of Pipe (Hf= 11.9’/10’ = 1.19’)
Hv= 2.195’ (from Table VI)
Hs= 1.64’ (safety factor from above)
Then: H = 33.5’* - NPSHR** - Hf- Hv- Hs
H = 33.5’ - 10’ - 1.19’ - 2.195’ - 1.64 = 18.475’
H = 18.475’ = Minimum Inlet Pressure
* 1 Bar = 14.5 PSI x 2.31 Ft of Head = 33.5’
7
5
10
15
20
30
25
0 10 2030405060708090100110120
NPSHR in Feet
Flow in GPM
VM06
VM04
VM02
VM01
FIGURE 8 - VM01 through VM06
Net Positive Suction Head Requirement (NPSHR)
Temperature Vapor Pressure Absolute Pressure
in °F (°C) in PSIA (kPa) in Feet (M) of Water
32 (0) 0.089 (.61) 0.205 (.062)
40 (4.4) 0.122 (.84) 0.281 (.086)
60 (15.6) 0.256 (1.77) 0.592 (.180)
80 (26.7) 0.507 (3.50) 1.172 (.358)
100 (37.8) 0.95 (6.55) 2.195 (.669)
120 (48.9) 1.695 (11.69) 3.914 (1.193)
140 (60.0) 2.892 (19.94) 6.681 (2.036)
160 (71.1) 4.745 (32.72) 10.961 (3.341)
180 (82.2) 7.515 (51.84) 17.36 (5.291)
200 (93.3) 11.529 (79.49) 26.632 (8.117)
210 (98.9) 14.125 (97.39) 32.629 (9.945)
212 (100) 14.698 (101.34) 33.952 (10.349)
220 (104.4) 17.188 (118.51) 39.704 (12.102)
230 (110.0) 20.78 (143.28) 48.002 (14.631)
240 (115.6) 24.97 (172.17) 57.681 (17.581)
248 (120.0) 28.79 (188.51) 66.505 (20.271)
TABLE VI – Vapor Pressure of Water

MAINTENANCE
Motor Replacement
For Key Numbers, refer to the Exploded View, Figure 14,
for VM01 and VM02 Series Models and to Figure 15 for
VM04 and VM06 Series Models.
Hazardous voltage. Disconnect all power to
the pump before servicing or working on pump. Make sure
that power is locked out and that pump cannot be
accidentally started.
1. Disconnect the power to the pump motor.
2. Close the nearest suction and discharge valves.
3. Remove the coupling guards (Key No. 4) by prying
them loose with a screw driver.
4. Remove the socket head screws (Key No. 3) and the
coupling halves (Key No. 2) from the shaft (Key No.
16A). For additional reference, see Figure 12, Page 9.
NOTICE: Socket head screws are metric. See Table VIII
on Page 11 for specific metric driver sizes.
5. Remove the coupling pin (Key No. 5).
6. Remove the capscrews (Key No. 13), flatwashers (Key
No.11), and lockwashers (Key No.12) that hold the
motor (Key No. 1) and the motor bracket (Key No. 6)
together.
7. Pull the old motor up and off of the motor bracket.
NOTICE: Note the location of the conduit box on the
motor.
8. Thoroughly clean the surfaces of the mounting flanges
on the new motor and the pump end.
9. Install the new motor on the pump with the conduit
box in the desired position.
10. Lubricate the capscrews (Key No. 13) with oil.
11. Reinstall the lockwashers, flatwashers, and capscrews
that hold the motor and the motor bracket together,
then tighten evenly and diagonally. See Table VIII,
Page 11 for torque specifications.
12. Reinstall the coupling pin (Key No. 5) in the shaft.
13. Reinstall the coupling halves (Key No. 2) on the pump
and motor shaft. Make sure to engage the couping pin
(Key No. 5).
NOTICE: Be sure coupling surfaces are thoroughly
clean prior to assembly.
14. Snug up the socket head screws (Key No. 3) until the
coupling begins to bind and then loosen 1/2 turn.
15. Draw up the capscrews evenly so the gap between the
coupling halves is equal on both sides (See Figure 9).
16. Insert a screw driver under the coupling (See Figure
10).
17. Raise the pump shaft to its highest point.
18. Lower the shaft halfway back down the distance you
just raised it and retighten the capscrews. See Figure
10.
NOTICE: Torque settings are critical to prevent
coupling movement. Refer to Table VIII, Page 11 for
torque specifications.
19. Rotate the shaft to make sure that there is no inter-
ference. If rubbing is noted repeat steps 16, 17, and 18
above and readjust pump shaft height.
20. Reinstall the coupling guards by snapping them into
place.
NOTICE: The guards should be in place before the unit
is run.
21. Open the suction and discharge valves. Turn the power
back on.
8
FIGURE 9 - Make Sure that the Coupling Halves are Evenly
Tightened
Motor
Pump
3359 1298
Raise Coupling
as far as it will go;
then tighten at
one-half the
height of total
axial play.
Axial
Play
Coupling
Setting
FIGURE 10 - Vertically (axial) Centering the Coupling

Replacing Pump Stack
For Key Numbers, refer to the Exploded View, Figure 14 on
Page 12, for the VM01 and VM02 Series Models and Figure
15 on Page 13 for VM04 and VM06 Series Models.
Hazardous pressure. Do not run pump with
discharge valve closed; the water in the pump may boil,
causing risk of explosion and steam burns to anyone
nearby.
1. Follow steps 1-8 under “Motor Replacement” section
on Page 8; then proceed with step 2 below.
2. Remove the four staybolt nuts, flatwashers, and
lockwashers (Key Nos. 7, 8, and 9) from the staybolts
(Key No. 19).
NOTICE: It is not necessary to remove the staybolts
when replacing the stack.
3. Lift the motor bracket (Key No. 6) off of the pump
body.
NOTICE: Note the position of the priming plug. The
priming plug must be returned to its original position
during reassembly.
4. Remove and discard upper sleeve O-ring (Key No. 17).
5. Clean gasket seat.
6. Remove and replace round spring ring (VM01 and
VM02) or conic spring (VM04 and VM06) (Key No. 14).
7. Pull the old stack (16A through 16L) out of the stainless
steel sleeve (Key No. 18) by pulling straight up on the
pump shaft (Key No. 16A).
8. Remove the stainless steel sleeve (Key No. 18).
9. Remove and discard the bottom sleeve O-Ring (Key
No. 17).
10. Clean the O-Ring seat.
11. Remove and discard the O-Ring (Key No. 21A) from
the suction/discharge (Key No. 21 VM01 and VM02
only).
12. Clean the O-Ring seat and install a new O-Ring (Key
No. 21A-VM01 and VM02 only).
13. Install a new lower sleeve O-Ring.
14. Install the new stack without the stainless steel sleeve.
NOTICE: Be sure to align either the small priming hole
or the suction interconnector pin hole (located on the
bottom stage of the stack) properly in the base of the
Suction/Discharge (Key No. 21). See Figure 11.
15. Use a rubber mallet to tap the stainless steel sleeve
(Key No. 18) into place.
16. Install a new mechanical shaft seal (Key Nos 15A
through 15G). Refer to “Mechanical Seal Disassembly”
and “Mechanical Seal Reassembly” sections, Page 10.
17. Install a new upper sleeve O-ring (Key No. 17).
18. Install a new round spring ring or conic spring (Key
No. 14).
19. Reinstall the motor bracket (Key No. 6) on the pump
body. Align the priming plug (Key No. 10) to its
original position.
20. Oil the threads on the staybolts (Key No. 19).
21. Replace the lockwashers, flatwashers, and staybolt nuts
(Key Nos. 7, 8 and 9) and cross-torque the staybolts.
See Table VIII, Page 11, for torque specifications.
22. Reinstall the motor (Key No. 1) on the motor bracket
(Key No. 6) and turn the motor to the desired terminal
box position.
23. Follow steps 10 - 21 under “Motor Replacement”, Page
8. You have now finished changing out the impeller
stack.
9
3358 1298
FIGURE 12 - Remove the Socket Head Screws and the Coupling
Halves
Priming
Hole Housing
Knob
Suction
Interconnector Interconnector
Pin
Suction/Discharge
FIGURE 11 - VM01, VM02 – Align Small Priming Port. VM04,
VM06 – Align Interconnector Pin

Seven Part Mechanical Seal/Disassembly:
See Figure 13 for Seal Key Numbers.
See Figures 14 through 17 for Pump Key Numbers.
Hazardous voltage. Can Shock, burn or cause
death. Disconnect power to pump before disassembly.
1. Follow Steps 1-8 under “Motor Replacement” Page 8,
and proceed with step 2 below.
2. Remove the four nuts, lockwashers, and washers (Key
Nos. 7, 8, and 9) from the staybolts (Key No. 19).
3. The shaft seal consists of an O-Ring (Key No. 15A), the
stationary half of the mechanical seal (Key No. 15B),
the rotating half of the mechanical seal (Key No. 15C),
a second O-Ring (Key No. 15D - inside No. 15C), a flat
washer (Key No. 15E), a spring (Key No. 15F), and a
mechanical drive ring (Key No. 15G), in that order; see
Figure 13, below. Turn the pump head upside down
and remove the stationary part of the seal (Key No.
15B) from the seal seat in the base of the motor
bracket.
NOTICE: Use care not to chip or scratch the seal seat
during disassembly and assembly.
4. Clean the seal seat with a wet cloth.
5. Remove the rotating parts of the seal by twisting and
pulling up on them until they come off of the shaft (Key
Nos.15C and 15D, 15E, 15F, and 15G). Discard the
old seal.
Seven Part Mechanical Seal Reassembly:
NOTICE: Before assembly check and clean all sealing and
gasket surfaces with a clean wet cloth. Replace all seals,
gaskets, and O-Rings.
1. Turn the motor bracket (Key No. 6) upside down.
2. Moisten the seal seat (in the motor bracket) with a
small amount of water.
3. Lubricate the larger diameter O-Ring (Key No. 15A)
with a small amount of water and install it on the
stationary half of mechanical seal (Key No. 15B).
4. Press the stationary half of the shaft seal (Key No. 15B)
with O-Ring (Key Nos. 15A and 15B) into the seal seat
of the motor bracket. Use finger pressure only. (If a tool
must be used, protect the seal face from tools with a
clean cloth).
NOTICE: Be sure the seal is installed evenly to avoid
pinching the O-Ring.
5. Lubricate smaller diameter O-Ring (Key No. 15D) with
water and press it into the rotating half of the
mechanical seal (Key No.15C).
6. Install the mechanical drive ring (Key No. 15G) on the
shaft (Key No. 16A). Be sure the drive ring butts up
against the mechanical seal spacer (Key No. 16C).
7. Install the spring (Key No.15F) up against the drive ring
on the shaft .
8. Install the flatwasher (Key No.15E) on the shaft, against
the spring.
9. Install the rotating half of the mechanical seal (Key
No.15C) on the shaft. Align the grooves on the rotating
half of the mechanical seal with the teeth on the
mechanical drive ring (Key No. 15G).
10. Follow Steps 11 - 23 under “Replacing Pump Stack”,
Page 9.
10
15A
15B
15C
15D
15E
15F
15G
16A
16B
16C
16A
FIGURE 13

Frequency of Starts and Stops
Check pump cycling frequency and make sure that the
pump is not starting more than:
Frost Protection
1. If you do not use your pump during seasons of frost,
drain it and add a glycol based antifreeze (50/50
mixture) to avoid damage.
Risk of water damage and injury. Watch the
direction of the priming plug and make sure that liquid
escaping from it does not injure persons nearby or damage
the motor or other components. In hot water installations,
pay particular attention to the risk of injury from scalding
hot water.
2. Upon restart dispose of spent antifreeze properly.
3. Do not replace the drain plug or tighten the priming plug
until you put the pump back in service again.
Regular Maintenance Checks
The following checks should be made at regular intervals:
1. The pump meets required performance and is operating
smoothly and quietly.
2. There are no leaks.
3. The motor is not overheating.
4. Remove and clean all strainers and filters in the system.
5. Verify amp draw – check motor amperage.
6. Pump wear rings and shaft require no regular
maintenance.
11
Coupling Motor Staybolt Stack Nut
Socket Head Socket Head Socket Head Capscrew Capscrew Hex Hex Hex Hex
Screw Screw Screw Hex Head Hex Head Nut Nut Nut Nut
M6 x 20 M8 x 25 M10 x 25 3/8 x 1-1/2 1/2 x 1-1/2 1/2 - 13 5/8 - 11 M8 M12
Hardware 1800- 1800- 1800- 1800- 1800- 1800- 1800- 1800- 1800-
Part Numbers M11369 M11398 M11491 S23568 S23623 S26460 S26462 M11385 M11419
Pump Model
Number
VM01 Series 15 20 – 30 35 40 – 10 –
VM02 Series 15 20 – 30 35 40 – 10 –
VM04 Series 15 20 45 30 35 – 45 – 30
VM06 Series – 20 45 – 35 – 45 – 30
TABLE VIII – Torque Specifications (foot-lbs.)
Cycles Motor HP Rating
20 times per hour 1/2 - 5 HP motors
15 times per hour 7- 1/2 - 15 HP motors
10 times per hour 20 and 25 HP motors
TABLEVII – Maximum Number of Cycles

12
2
5
6
15A
15B
15C
15D
15E
15F
15G
16A
16B
3
2
3
4
4
11
10
12
13
14
16C
16D
16E
16F
16G
16F
16G
16F
16G
16F
16F
16G
18
19
17
21A
20
20
21
17
16H
16E
16I
16E
16J
16L
16K
7
8
9
22
23
24
25
3362 0199
1
FIGURE 14 - Exploded View VM01 and VM02
REPAIR PARTS LIST FOR VM01 AND VM02 SERIES MODELS
VM01
VM02
Key
No. Description
1 Motor
2 Coupling Half
3 Socket Head Screw
4 Coupling Guard
5 Coupling Pin
6 Motor Bracket
7 Staybolt Nut
8 Staybolt Lockwasher
9 Staybolt Flat Washer
10 Vented Priming Plug
11 Flatwasher
12 Lockwasher
13 Capscrew
14 Spring Ring
15 Seven Part Mechanical Seal (Includes 15A thru 15G)
15A O-Ring, Larger Diameter
15B Stationary Half of Mechanical Seal
15C Rotating Half of Mechanical Seal
15D O-Ring, Smaller Diameter
15E Flat Washer
15F Spring
15G Mechanical Drive Ring
16 Replacement Stack Kit (Incl. Key Nos. 16A thru 16L)
Key
No. Description
16A Shaft
16B Stop Ring
16C Mechanical Seal Spacer
16D Upper Intermediate Chamber
16E Spacer
16F Impeller
16G Diffuser
16H Spacer
16I Bearing
16J Shaft Washer
16K Nut
16L Suction Chamber
17 Sleeve O-Ring
18 Stainless Steel Sleeve
19 Staybolt
20 Pipe Plug
21 Suction/Discharge
21A O-Ring (Bottom Chamber)
22 Drain Plug Gasket
23 O-Ring
24 O-Ring
25 Drain Plug

13
REPAIR PARTS LIST FOR VM04 AND VM06 SERIES MODELS
1
2
3
5
6
13
11
12
14
2
3
16A
16B
16C
16D
16D
16D
16E
16F
16F
16F
16F
16H
16H
16J
16K
16L
17
19
21
20
20
17
18
16I
16G
16G
16G
16G
7
8
9
10
22
23
24
3363 0199
15A
15B
15C
15D
15E
15F
15G
4
4
Figure 15 - Exploded View VM04 and VM06
VM04
VM06
Key
No. Description
1 Motor
2 Coupling Half
3 Socket Head Screw
4 Coupling Guard
5 Coupling Pin
6 Motor Bracket
7 Staybolt Nut
8 Staybolt Lockwasher
9 Staybolt Flat Washer
10 Vented Priming Plug
11 Flat Washer
12 Lock Washer
13 Capscrew
14 Conic Spring
15 Seven Part Mechanical Seal (Includes 15A thru 15G)
15A O-Ring, Larger Diameter
15B Stationary Half of Mechanical Seal
15C Rotating Half of Mechanical Seal
15D O-Ring, Smaller Diameter
15E Flat Washer
15F Spring
15G Mechanical Drive Ring
Key
No. Description
16 Replacement Stack Kit (Incl.16A thru 16L)
16A Shaft
16B Stop Ring
16C Mechanical Seal Spacer
16D Spacer
16E Upper Intermediate Chamber
16F Diffuser
16G Impeller
16H Spacer
16I Bearing
16J Suction Chamber
16K Shaft Washer
16L Nut
17 Sleeve O-Ring
18 Stainless Steel Sleeve
19 Staybolt
20 Pipe Plug
21 Suction/Discharge
22 Drain Plug Gasket
23 O-Ring
24 Drain Plug

COMMERCIAL PUMP WARRANTY TERMS
(MODELS VI, VM, FE, CE, TA, S1700)
Taco, Inc. will repair or replace without charge (at the Company’s option) any commercial pump product or part which is proven to be defective under
normal use within one year from date of start-up or one year and six months from date of shipment (whichever occurs first).
In order to obtain service under warranty, it is the responsibility of the purchaser to promptly notify the Company in writing and promptly deliver the
item in question, delivery prepaid to the factory. For complete details on warranty returns, the purchaser should contact a local Taco stocking distributor
or the Company. If the product or part in question contains no defect as covered in this warranty, the purchaser will be billed for parts and labor charges
in effect at time of factory examination and repair.
Motors provided on commercial pumps are not covered by this warranty, and are warranted by the motor manufacturer. For complete details on motor
warranty returns, the purchaser should contact the motor manufacturer’s local service repair center or contact the motor manufacturer directly.
Seals provided on commercial pumps are not covered by this warranty.
Any Taco product or part not installed or operated in conformity with Taco instructions or which has been subjected to misuse, misapplication, the
presence of certain chemicals (such as solvents, acids, etc.) or other abuse will not be covered by this warranty. For complete information on chemical
and application restrictions, the purchaser should contact the company.
Taco, Inc. reserves the right to make changes in details of design, construction, or arrangement of materials of its products without notification.
TACO, INCORPORATED OFFERS THIS WARRANTY IN LIEU OF ALL OTHER EXPRESS OR IMPLIED WARRANTIES. NO WARRANTIES ARE MADE
FOR MERCHANTABILITY OR FITNESS FOR USE AND THERE ARE NO WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTION CONTAINED
HEREIN. TACO, INC. WILL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES.
Taco, Inc.
1160 Cranston Street, Cranston, RI 02920 • [phone]
14
TROUBLESHOOTING GUIDE
Hazardous voltage and risk of sudden starts. Disconnect all power to the pump before servicing or working
on pump. Make sure that power is locked out and that pump cannot be accidentally started.
PROBLEM CAUSE
1. Motor does not run when started A. Power failure
B. Fuses blown
C. Motor starter overload has tripped out
D. Main contacts in motor starter are not making contact or the coil is faulty
E Control circuit fuses are defective
F. Motor is defective
2. Motor starter overload trips out immediately A. One fuse has blown
when power supply is switched on B. Contacts in motor overload relay are faulty
C. Cable connections are loose or faulty
D. Motor winding is defective
E. Pump mechanically blocked
F. Overload setting is too low
3. Motor starter overload trips out occasionally A. Overload setting is too low
B. Low voltage at peak times
4. Motor starter has not tripped out but the motor A. Check 1 A), B), D,) and E)
does not run
5. Pump capacity is not constant A. Pump inlet pressure is too low
B. Suction pipe/pump partly blocked
C. Pump is sucking air
6. Pump runs but gives no water A. Suction pipe/pump blocked
B. Foot or non-return valve is blocked in closed position
C. Leakage in suction pipe
D. Air in suction pipe or pump
E. Motor rotates in the wrong direction
7. Pump runs backwards when switched off A. Leakage in suction pipe
B. Foot or non-return valve is defective
C. Foot valve is blocked in open or partly open position
D. Non return valve leaks or is blocked in open or partly open position
E. Discharge valve is defective
8. Leakage from shaft seal A. Pump shaft position is incorrect
B. Shaft seal is defective
9. Noise A. Cavitation is occurring in the pump
B. Pump does not rotate freely (That is, there is increased frictional resistance)
because of incorrect shaft position

15