Graco 25C782 User manual

Instructions and Parts
SaniForce™
Sanitary Drum
Pumps
For use in sanitary applications to transfer medium to high viscosity fluids. Not approved
for use in explosive atmospheres or hazardous locations. For professional use only.
See page 3 for model information, including maximum fluid working pressure.
Important Safety Instructions
Careless pump operation can result in
serious injury. Read all warnings and
instructions in this manual. Save these
instructions.
Model 25C420 Shown
3A4586E
EN

2 3A4586E
Contents
Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical Connections (17N668 Motor) . . . . . . . . 7
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Pre-Start Checklist . . . . . . . . . . . . . . . . . . . . . . . 9
Flush Before First Use . . . . . . . . . . . . . . . . . . . . 9
Tighten Connections . . . . . . . . . . . . . . . . . . . . . . 9
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Initial Configuration (17N668 motor with Graco
VFD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Graco VFD Operation (17N668 motor) . . . . . . . 11
Pump Shutdown . . . . . . . . . . . . . . . . . . . . . . . . 12
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Flushing Procedure . . . . . . . . . . . . . . . . . . . . . . 14
Cleaning Procedure . . . . . . . . . . . . . . . . . . . . . 14
Models 25C411 - 25C414 . . . . . . . . . . . . . . . . . 15
Models 25C416 - 25C419, 25C776 - 25C779 . . 17
Models 25C420, 25C421, 25C422, 25C780,
25C781, 25C782 . . . . . . . . . . . . . . . . . . . . 19
17N666 and 17N667 Motor Maintenance . . . . . 21
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Complete Pump Models 25C411, 25C412, 25C413,
and 25C414 . . . . . . . . . . . . . . . . . . . . . . . . 24
Complete Pump Models 25C420, 25C421, 25C780,
25C781 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Complete Pump Models 25C416 - 25C419,
25C776 - 25C779 . . . . . . . . . . . . . . . . . . . . 28
Complete Pump Model 25C422, 25C782 . . . . . 30
Performance Charts . . . . . . . . . . . . . . . . . . . . . . . . 32
Models 25C411 - 25C419, 25C776 - 25C779 . . 32
Models 25C420 - 25C421, 25C780 - 25C781 . . 33
Model 25C422, 25C782 . . . . . . . . . . . . . . . . . . . 34
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Models 25C411, 25C412, 25C416, 25C417,
25C776, 25C777 . . . . . . . . . . . . . . . . . . . . . 35
Models 25C413, 25C414, 25C418, 25C419,
25C778, 25C779 . . . . . . . . . . . . . . . . . . . . . 35
Models 25C420, 25C421, 25C780, 25C781 . . . 36
Models 25C422, 25C782 . . . . . . . . . . . . . . . . . . 36
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Models
3A4586E 3
Models
ETL Label
System
Model
Motor Lower Unit Motor
ApprovalsModel Type Model Length Notes
Impeller
25C411 17N666 115 VAC, variable speed † 17N669 39 inches See ETL label
25C413 17N666 115 VAC, variable speed † 17N670 47 inches
25C412 17N667 230 VAC, Euro plug, variable speed ‡ 17N669 39 inches
25C414 17N667 230 VAC, Euro plug, variable speed ‡ 17N670 47 inches
High Volume See ETL label
25C416 17N666 115 VAC, variable speed † 17N671 39 inches
25C417 17N667 230 VAC, Euro plug, variable speed ‡ 17N671 39 inches
25C418 17N666 115 VAC, variable speed † 17N672 47 inches
25C419 17N667 230 VAC, Euro plug, variable speed ‡ 17N672 47 inches
High Pressure
25C776 17N666 115 VAC, variable speed † 17S148 39 inches
25C777 17N667 230 VAC, Euro plug, variable speed ‡ 17S148 39 inches
25C778 17N666 115 VAC, variable speed † 17S149 47 inches
25C779 17N667 230 VAC, Euro plug, variable speed ‡ 17S149 47 inches
Progressive Cavity ◆
25C780 17N666 115 VAC, variable speed † 17S150 39 inches bag-liner
foot See ETL label
25C420 17N666 115 VAC, variable speed † 17N673 39 inches
25C781 17N667 230 VAC, Euro plug, variable speed ‡ 17S150 39 inches bag-liner
foot
25C421 17N667 230 VAC, Euro plug, variable speed ‡ 17N673 39 inches
25C422* 17N668 190/380 or 230/460 VAC, 3 phase, water
washdown 17N674 39 inches UL recognized component
25C782* 17N668 190/380 or 230/460 VAC, 3 phase, water
washdown 17S153 39 inches bag-liner foot
* Pump hanger 17P662 included.
† Wired with a North American “Type B” 3-pin plug.
‡ Wired with a European “Type F” 2-pin plug.
◆Pump elevator 24V310 or 24V311 can be used
with these pumps. Pump mounting bracket 24V303
may work for mounting on customer-owned eleva-
tors. These are ordered separately.
Type B Type F

Warnings
4 3A4586E
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The exclama-
tion point symbol alerts you to a general warning and the hazard symbols refer to procedure-specific risks. When
these symbols appear in the body of this manual, refer back to these Warnings. Product-specific hazard symbols and
warnings not covered in this section may appear throughout the body of this manual where applicable.
WARNING
+
PRESSURIZED EQUIPMENT HAZARD
Fluid from the equipment, leaks, or ruptured components can splash in the eyes or on skin and cause
serious injury.
• Follow the Pressure Relief Procedure when you stop dispensing and before cleaning, checking, or
servicing equipment.
• Tighten all fluid connections before operating the equipment.
• Check hoses, tubes, and couplings daily. Replace worn or damaged parts immediately.
MOVING PARTS HAZARD
Moving parts can pinch, cut or amputate fingers and other body parts.
• Keep clear of moving parts.
• Do not operate equipment with protective guards or covers removed.
• Pressurized equipment can start without warning. Before checking, moving, or servicing equipment,
follow the Pressure Relief Procedure and disconnect all power sources.
FIRE AND EXPLOSION HAZARD
Flammable fumes, such as solvent and paint fumes, in work area can ignite or explode. To help prevent
fire and explosion:
• Use equipment only in well ventilated area.
• Eliminate all ignition sources; such as pilot lights, cigarettes, portable electric lamps, and plastic drop
cloths (potential static arc).
• Keep work area free of debris, including solvent, rags and gasoline.
• Do not plug or unplug power cords, or turn power or light switches on or off when flammable fumes
are present.
• Ground all equipment in the work area. See Grounding instructions.
• Use only grounded hoses.
• Hold gun firmly to side of grounded pail when triggering into pail.
• If there is static sparking or you feel a shock, stop operation immediately. Do not use equipment
until you identify and correct the problem.
• Keep a working fire extinguisher in the work area.

Warnings
3A4586E 5
ELECTRIC SHOCK HAZARD
This equipment must be grounded. Improper grounding, setup, or usage of the system can cause elec-
tric shock.
• Turn off and disconnect power cord before servicing equipment.
• Connect only to grounded electrical outlets.
• Use only 3-wire extension cords.
• Ensure ground prongs are intact on power and extension cords.
• Do not expose to rain. Store indoors.
• Do not submerge the motor in liquid.
• Never carry the motor by the power cord.
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
• Do not operate the unit when fatigued or under the influence of drugs or alcohol.
• Do not exceed the maximum working pressure or temperature rating of the lowest rated system com-
ponent. See Technical Data in all equipment manuals.
• Use fluids and solvents that are compatible with equipment wetted parts. See Technical Data in all
equipmentmanuals.Readfluidandsolventmanufacturer’swarnings.Forcompleteinformationabout
your material, request SDS from distributor or retailer.
• Do not leave the work area while equipment is energized or under pressure.
• Turn off all equipment and follow the Pressure Relief Procedure when equipment is not in use.
• Check equipment daily. Repair or replace worn or damaged parts immediately with genuine manu-
facturer’s replacement parts only.
• Do not alter or modify equipment.
• Make sure all equipment is rated and approved for the environment in which you are using it.
• Use equipment only for its intended purpose. Call your distributor for information.
• Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.
• Do not kink or over bend hoses or use hoses to pull equipment.
• Keep children and animals away from work area.
• Comply with all applicable safety regulations.
BURN HAZARD
Equipment surfaces and fluid that is heated can become very hot during operation. To avoid sever
burns:
• Do not touch hot fluid or equipment.
PERSONAL PROTECTIVE EQUIPMENT
You must wear appropriate protective equipment when operating, servicing, or when in the operating
area of the equipment to help protect you from serious injury, including eye injury, hearing loss, inhala-
tion of toxic fumes, and burns. This equipment includes but is not limited to:
• Protective eyewear, and hearing protection.
• Respirators, protective clothing, and gloves as recommended by the fluid and solvent manufacturer.
WARNING

Installation
6 3A4586E
Installation
Grounding
Grounding is an electrical connection between a metal
vessel, pump, or motor and a true earth ground.
Motor: Electrical cords must be connected to outlets
with electrical ground.
Pump: Ensure that the ground screw provided with the
pump is connected to a true earth ground. Insert one
end of a 14 AWG minimum ground wire behind the
ground screw and tighten the screw securely. Connect
the clamp end of the grounding wire to a true earth
ground. A ground wire and clamp, Part 238909, is avail-
able from your Graco distributor.
Fluid hoses: use only electrically conductive hoses with
a maximum of 500 ft. (150 m) combined hose length to
ensure grounding continuity. Check electrical resistance
of hoses. If total resistance to ground exceeds 25 meg-
ohms, replace hose immediately.
Material supply container: follow local code.
Container(s) that receive material: follow local code.
To maintain grounding continuity when flushing or
relieving pressure: hold metal part of the dispense
valve firmly to the side of a grounded metal pail, then
trigger the valve.
Mounting
1. Remove the pump and motor from packaging.
2. Inspect all contents for damage.
3. Install the motor with pump lower:
a. On pumps using the 17N668 motor, hang the
pump using the included motor hanger (302)
using adequate hardware, following local code.
Torque the motor hanger to 30-36 ft-lb (41-49
N-m).
b. On pumps using the 17N666 or 17N667 motor,
attach motor to pump by tightening the motor
nut on the pump.
The equipment must be grounded to reduce the risk of
static sparking and electric shock. Electric or static
sparking can cause fumes to ignite or explode.
Improper grounding can cause electric shock. Ground-
ing provides an escape wire for the electric current.
To avoid injury from a falling pump, model 25C422 or
25C782, check the connections on the motor hanger
(302) before using the motor hanger to lift the pump.
NOTICE
To avoid damaging the pump, do not overtighten the
mounting hardware.

Installation
3A4586E 7
Electrical Connections (17N668 Motor)
Wire Connections at the Motor
NOTE: Graco recommends the use of a motor soft
starter or a VFD in the electrical circuit for all installa-
tions. In all cases, make sure all products are installed in
accordance with local codes and regulations.
1. Remove 4 bolts to open the motor’s electrical box.
2. Internal Wiring:
a. For 460V Motors: The motor typically comes
wired for 460 V. If this is the voltage you want,
the existing wiring can remain as it is.
b. For 230V Motors: Move the 7, 8, and 9 wires
as shown. Bridge W2, U2, and V2 as shown.
3. Install wiring system with proper liquid-tight connec-
tions in one of the ports at the bottom of the motor
box.
4. Connect the ground wire to the ground screw.
Torque the M5 stud to 17.7 in-lb (2.0 N-m).
5. Connect power wires L1, L2 and L3 to line terminals
U1, V1, and W1.
6. Torque terminals to 14.2 in-lb (1.6 N-m). Do not
overtorque.
7. Close the motor electrical box. Torque the screws to
20 in-lb (2.3 N-m).
Wire Connections at the Variable
Frequency Drive (VFD)
NOTE: For variable speed control, the motor must be
wired to a VFD. Follow the instruction in the VFD manu-
facturer’s manual.
If you purchased an optional Graco VFD, install wiring at
the VFD as follows:
1. Connect the wires to the motor. See Wire Connec-
tions at the Motor.
2. Open the VFD’s electrical box.
3. Install the wiring system with proper liquid-tight con-
nections for incoming supply power and for outgoing
motor power.
4. Connect the ground wires for the VFD and for the
motor to the ground screw.
5. Connect the wires from the motor terminals to the
matching terminals in the VFD box, as shown.
To avoid injury from fire, explosion, or electric shock,
all electrical wiring must be done by a qualified electri-
cian and comply with all local codes and regulations.
W2 U2 V2
47 58 69
231
U1 V1 W1
W2 U2 V2
17 28 39
564
U1 V1 W1
To avoid injury from fire, explosion, or electric shock, all
electrical wiring must be done by a qualified electrician
and comply with all local codes and regulations.
• Disconnect power before servicing.
• Wait 5 minutes for capacitor discharge before
opening.

Installation
8 3A4586E
6. Connect the power supply wires to the power termi-
nals in the VFD box. See the following table and fig-
ures, as applicable to your system.
7. Close the VFD electrical box.
8. Perform the VFD configuration.
U/T1V/T2W/T3PE
PE
PES
PES
PES
PES
PES
PE
VFD
Part No. HP Nominal Input Voltage Input Voltage Range Nominal Output Voltage† See Figure
16K909 1.5 120 Vac, 1 phase 90-132 Vac 240 Vac, 3 phase FIG. 1
16K909 1.5 240 Vac, 1 phase 170-264 Vac 240 Vac, 3 phase FIG. 2
16K910 1.5 208-240 Vac, 1 phase 170-264 Vac 208-240 Vac, 3 phase FIG. 3
16K910 1.5 208-240 Vac, 3 phase 170-264 Vac 208-240 Vac, 3 phase FIG. 4
† Output voltage is dependent on input voltage.
FIG. 1 120 Vac 1 Phase Input/240 Vac 3 Phase Output
FIG. 2 240 Vac 1 Phase Input/240 Vac 3 Phase Output
PE L1L2N
PE L1N
PE L1L2N
PE L1L2
FIG. 3 208-240 Vac 1 Phase Input/208-240 Vac 3
Phase Output
FIG. 4 190, 208-240 Vac 3 Phase Input/190, 208-240
Vac 3 Phase Output
PE L1L2L3
PE L1N
PE L1L2L3
PE L1L2L3

Setup
3A4586E 9
Setup
Accessories are available from Graco. Make certain all
accessories are sized and pressure-rated to meet your
system requirements.
• Verify that the motor voltage corresponds to proper
electrical supply. Before plugging motor into power
supply, make sure the motor switch is in the OFF
position.
• Before operation, confirm all pump connections are
properly tightened.
• Before starting the pump, confirm the discharge
hose is securely fastened to the receiving vessel in
order to prevent splashing.
Pre-Start Checklist
Verify each of the following items before starting the
pump.
•DEBRIS: Ensure that the fluid supply is free of dirt,
debris, and any contaminants.
•HOSE MATERIAL: Check that the hose material is
compatible with the fluid being pumped. Consult
your Graco distributor for available hose materials.
•FASTENERS: Check that all fasteners are properly
tightened.
•LEAKS: Check the connections on the fluid outlet to
be sure there are no leaks.
Flush Before First Use
The sanitary pump was assembled using sanitary lubri-
cant on moving parts and was tested in water. Flush the
pump thoroughly with an appropriate cleaning solution,
and disassemble and sanitize the parts before using the
pump. See Flushing Procedure, page 14. Check
national, state, and local codes for specific limitations.
Tighten Connections
Before each use, check all hoses for wear or damage.
Replace as necessary. Check that all connections are
tight and leak-free.

Operation
10 3A4586E
Operation
1. Use closed top drum or other cover to prevent pos-
sible contamination.
2. Once the pump is fully cleaned, assembled, and all
connections are securely fastened, insert the pump
into the drum or tank.
3. It is recommended to attach a suitable hose or pipe
to the pump discharge.
4. If you opt to use a hose:
a. Ensure that the hose meets the pump discharge
pressure requirements. It is recommended to
use a hose that is rated 4x the pump discharge
pressure.
b. Fasten the hose to the hose barb with a suitable
hose clamp that exceeds the pump discharge
pressure. A hose barb fitting kit, part 25C502, is
available from your Graco distributor.
5. Variable speed pumps should be started at approxi-
mately half speed according to the dial settings.
Turn the motor to the ON position. Throttle flow to
desired output pressure by varying the potentiome-
ter (motors 17N666 and 17N667) or VFD frequency,
if applicable on motor 17N668.
6. After use, flush and clean the pump. Then store the
pump vertically.
• Moving parts can pinch, cut or amputate fingers
and other body parts. Keep your hands and fingers
away from the mechanical seal viewing window on
models 25C422 or 25C782 during operation and
whenever the pump is connected to a power
source. Disconnect power before moving.
• Do not use these pumps for the transfer of
flammable or combustible products or in an
environment where flammable or combustible
fumes are present.
• Do not clean or flush the pump with flammable or
combustible fluids.
• Progressive cavity pumps are positive displace-
ment pumps and should never be operated
against shut-off elements such as nozzles, valves,
etc. Failure to comply may result in excessive
pressure build resulting in serious injury and pump
damage.
NOTICE
• Never allow the pump to run dry of fluid. A dry
pump will possibly damage itself.
• Progressive cavity pumps 25C420, 25C421,
25C780, and 25C781 are recommended for inter-
mittent duty use only to prevent premature motor
wear. (i.e., 30 minute intervals with a 10 minute
cooling off period). For continuous duty applica-
tions, Graco recommends using models 25C422 or
25C782.

Operation
3A4586E 11
Initial Configuration (17N668
motor with Graco VFD)
For initial setup, review at least the following menus to
configure the system to suit your particular needs. See
your VFD manual for detailed information about each
menu option and about default settings.
1. VFD Parameter P103 controls the maximum fre-
quency (the top end of manual speed) of running
your pump. This setting is NOT your operating fre-
quency. It is the maximum limit of operating fre-
quency.
2. VFD Parameter P108 controls motor overload. Set
so that the VFD cannot supply more current to the
motor than it can handle. The formula for the set
value is:
X = Motor current rating x 100/VFD output current
rating
3. VFD Parameter P171 controls the absolute current
limit. It is set to allow for momentary spikes in cur-
rent above the limit set in P108. A spike occurs, for
example, when the roller passes over the double
hose section. This parameter is usually set for 2 to 3
times the value on menu P108, which was calcu-
lated in the previous step.
4. VFD Parameter P112 controls the direction of motor
rotation. See Reverse Motor Direction, page 12.
5. VFD Parameter P104 (optional) controls the rate at
which the motor will ramp up to the set speed.
6. VFD Parameter P166 (optional) allows for adjust-
ment to the noise that the motor creates. Each set-
ting changes the tone.
Graco VFD Operation (17N668
motor)
VFD Control Panel
NOTE: For complete information about the VFD, see
the manufacturer’s instructions supplied with the VFD.
• The control panel display shows the status of the
motor. It also shows the direction of motor rotation:
FWD (forward) or REV (reverse).
• The green RUN key starts the motor.
• The red STOP key stops the motor.
• Use the arrow keys to speed up or slow down the
motor.
• The blue R/F key changes the motor rotation (see
Reverse Motor Direction, page 12).
• The blue M key accesses the VFD menu. See the
manufacturer’s instructions for menu descriptions
and information.
If the M key is pressed, use the arrow keys to scroll
through the VFD menu.
Factory Settings
VFD settings are preset at the factory for most applica-
tions. See Initial Configuration (17N668 motor with
Graco VFD), page 11, to change the default settings as
needed to suit your needs.
FWDAUTO
REV
STOP
RUN

Operation
12 3A4586E
Reverse Motor Direction
NOTE: VFD Parameter P112 controls the direction of
motor rotation. The VFD is shipped with the rotation set
to forward as a default.
1. Verify which direction the pump is rotating.
2. Press the M key to access the VFD menu.
3. Scroll to P112, using the arrow keys.
4. Press the M key again.
5. 00 will display on the screen. Use the arrow keys to
set the display to 01. This allows both forward and
reverse rotation.
6. Press the M key to enter the setting. The screen will
display STOP or the last frequency setting.
NOTE: To use this feature when operating the pump,
press the R/F key, then the M key. The drive will slow
and the motor will reverse direction. Press the RUN key
and check that the roller is moving in the opposite direc-
tion.
Adjust the Speed
Use the arrow keys on the VFD control panel to
increase or decrease the motor speed.
Pump Shutdown
The output pressure will drop as soon as the motor is
turned off. Any low viscosity fluid in the inlet tube of an
impeller pump will fall to the level of the fluid of the
source vessel. Higher viscosity fluids in an impeller
model or any progressive cavity pump will remain at the
level at the time of shutdown.
Pump shutdown is possible using the ON/OFF switch on
the motor.

Troubleshooting
3A4586E 13
Troubleshooting
Check all possible remedies in the Troubleshooting
Chart before disassembling the pump.
NOTICE
The variable speed control should not be used as an
ON/OFF control. It will stop the motor from operating,
but does not turn off the motor.
Problem Cause Solution
Pump fails to operate. Exhausted fluid supply. Refill fluid supply.
Damaged motor. Replace motor.
No power to motor. Ensure motor is plugged in to correct
power outlet.
Pump operates, but output low. Cavitation due to excessive pump
speed. Reduce pump speed.
Exhausted fluid supply. Refill fluid supply.
Obstructed fluid line Clear fluid line.
Erratic or accelerated operation. Exhausted fluid supply. Refill fluid supply.
Rattling sound Loose motor nut. Tighten motor nut.

Maintenance
14 3A4586E
Maintenance
Flushing Procedure
NOTE:
• Flush before fluid can dry in the equipment, at the
end of the day, before storing, and before repairing
equipment.
• Flush at the lowest pressure possible. Check con-
nectors for leaks and tighten as necessary.
• Flush with an appropriate cleaning solution.
1. Remove the pump from the fluid container.
2. Place siphon tube in grounded metal pail containing
an appropriate cleaning solution.
3. Set pump to lowest possible fluid pressure, and start
pump.
4. Run the pump long enough to thoroughly clean the
pump and hoses.
Cleaning Procedure
NOTE: The following instructions are a basic procedure
for cleaning a sanitary pump.
•Be sure to follow your national and state sanitary
standard codes and local regulations.
• Use appropriate cleaning and disinfecting agents, at
intervals appropriate for product processed.
• Followcleaning product manufacturer’sinstructions.
NOTE: The pump must be disassembled to clean it
thoroughly.
1. Remove the pump from the fluid container.
2. Flush the system thoroughly with an appropriate
cleaning solution. See Flushing Procedure,
page 14.
3. Remove the fluid hoses and fittings from the pump.
4. Disassemble the fluid pump and accessories. See
Models 25C411 - 25C414, page 15, Models
25C416 - 25C419, 25C776 - 25C779, page 17 or
Models 25C416 - 25C419, 25C776 - 25C779, page
19.
5. Wash all pump parts with an appropriate cleaning
solution at the cleaning product manufacturer’s rec-
ommended temperature and concentration.
6. Rinse all pump parts again with water and allow
them to dry.
7. Inspect all pump parts and reclean if needed.
NOTE: Any damaged rubber parts must be replaced as
they could harbor microorganisms that can contaminate
the fluid.
8. Immerse all pump parts in an appropriate sanitizer
before assembly. Take the pump parts out of the
sanitizer one-by-one as needed.
9. Lubricate the threaded parts and o-rings with appro-
priate waterproof sanitary lubricant.
10. Circulate the sanitizing solution through the pump
and the system prior to use.

Maintenance
3A4586E 15
Models 25C411 - 25C414
Uninstall the Pump
1. Turn off the motor.
2. Disconnect the motor from the power source and
detach the ground wire from the lower unit.
3. Remove the fluid hose from the pump.
4. Remove the pump from container.
5. Carry the pump to the bench for service.
Disassemble the Pump
NOTE: If removal of any part requires use of a tool for
gripping, use only non-marring tools.
1. Remove motor by unthreading the motor nut (2).
2. Remove the foot (19).
NOTE: This part is reverse threaded. While facing
the bottom of the foot, rotate the foot clockwise to
remove.
3. Grasp the coupling (4) with one hand and the impel-
ler (18) with the other hand. Unscrew the coupling
or impeller:
NOTE: If the coupling unscrews, capture the two
bearings (5), bearing spacer (6) and u-cup (7) for
re-use when removing the drive shaft from the tube.
4. Using the remaining item still attached to the drive
shaft, pull the drive shaft out of the tube.
NOTE: The guide sleeve (9) may also come out
when removing the drive shaft. If it does, remove it
from the tube and drive shaft. If it does not come out
now, it will be removed later.
5. Unscrew the coupling or impeller from the drive
shaft. If it is the coupling, retain the 2 bearings (5),
bearing spacer (6) and u-cup (7) for re-use.
6. If the guide sleeve (9) did not come out with the
drive shaft, remove it now. It must be removed from
the motor end of the tube because of the flare on
the end of the guide sleeve.
NOTE: If necessary, use a non-marring object
which is at least 12 inches long inserted from the
foot end of the inner tube to push the guide sleeve
out far enough to present a graspable surface.
7. Remove the pump housing (16).
NOTE: This part is reverse threaded. While facing
the foot end of the tube, rotate the pump housing
clockwise to remove.
8. Remove the bushing (17) from the pump housing.
NOTE: The exposed end of the bushing is flared. If
necessary, push against the inside end of the bush-
ing to expose a graspable surface.
9. Using an o-ring tool, remove the two o-rings (15)
from the inner tube.
10. Remove the flange (10).
NOTE: This part is reverse threaded. While facing
from the motor end of the tube, rotate the flange
clockwise to remove.
11. Using a flat-blade screwdriver, remove the snap ring
(3) from the motor nut (2) and remove both from the
flange (10).
12. Clean and inspect all components. Replace any
damaged components.
Moving parts can pinch, cut or amputate fingers and
other body parts. Keep your hands and fingers away
from the pump inlet during operation and whenever the
pump is connected to a power source. Disconnect
power before moving.

Maintenance
16 3A4586E
Reassemble After Cleaning
NOTE: Any damaged parts must be replaced as they
could harbor microorganisms that can contaminate the
fluid.
NOTE: Lubricate the o-rings and threaded fittings with
appropriate waterproof sanitary lubricant during assem-
bly.
1. Install the two O-rings (15) onto the inner tube.
2. Install non-flared end of the guide sleeve (9) into the
inner tube of tube (14) from the motor end. Push
down into the inner tube until the flared end is
against the end of the inner tube.
3. At the foot end of tube (14) align the inner tube with
the large opening of the pump housing. Turning
counter-clockwise, install the pump housing.
Tighten hand tight.
4. At pump housing (16) insert the non-flared end of
bushing (17) and press the bushing into the pump
housing until the flared end of the bushing is against
the center portion.
5. At the motor end of the tube (14) place the snap ring
(3) on the tube for use in the next step. Install the
connection flange onto the tube. Tighten hand tight.
6. Install the nut (2) and snap ring (3) on the connec-
tion flange (10).
7. On the drive shaft, locate the end with stepped
diameters. With this end of the drive shaft facing to
the right, install the u-cup (7) with the opening facing
right, a bearing (5), spacer (6), bearing (5) and cou-
pling (4). Tighten finger tight.
8. Insert the impeller end of the drive shaft through the
connection flange (10) until the bearings are seated
in the connection flange.
NOTE: If binding occurs during insertion, rotating
the drive shaft should help.
9. At the foot end of the tube, attach the impeller onto
the drive shaft. Hold the coupling on one end of the
drive shaft and the impeller on the other. Tighten
both finger tight.
10. Facing the foot end of the tube (14), install the foot
(19) on the tube. Tighten finger tight by screwing the
foot counter-clockwise.
11. Attach the motor to the lower unit by tightening
motor nut (2) hand tight.
12. When installing pump into container, attach the
ground wire to the lower unit as specified in
Grounding on page 6.

Maintenance
3A4586E 17
Models 25C416 - 25C419, 25C776 - 25C779
Uninstall the Pump
1. Turn off the motor.
2. Disconnect the motor from the power source and
detach the ground wire from the lower unit.
3. Remove the fluid hose from the pump.
4. Remove the pump from container.
5. Carry the pump to the bench for service.
Disassemble the Pump
NOTE: If removal of any part requires use of a tool for
gripping, use only non-marring tools.
1. Remove motor by unthreading the motor nut (110).
2. Using a flat-blade screwdriver, remove the snap ring
(111) from the motor nut (110) and remove both
from the inner tube (103) flange area.
3. Loosen the tri-clamp connector (109).
4. Pull the inner tube assembly (103) out of the outer
tube (101).
5. Grasp the impeller (108) with one hand and the
motor coupling (112) with the other hand. Unscrew
the motor coupling or impeller from the drive shaft
(104).
• If the motor coupling unscrews, retain the two
bearings (107), bearing spacer (106) and seal
(105) for re-use.
• If the impeller unscrews, retain the o-ring (116)
for re-use.
6. Remove the drive shaft (104).
7. Remove The guide sleeve (114) from the drive shaft
(104) or out of the inner tube assembly (103).
8. Remove the remaining attached items on the impel-
ler end, or drive end, of the drive shaft. Retain all
parts for re-use.
9. Remove o-ring (117), spacer (115), and bushing
(113) from the inner tube (103).
10. Clean and inspect all components. Replace any
damaged components.
Moving parts can pinch, cut or amputate fingers and
other body parts. Keep your hands and fingers away
from the pump inlet during operation and whenever the
pump is connected to a power source. Disconnect
power before moving.

Maintenance
18 3A4586E
Reassemble After Cleaning
NOTE: Any damaged parts must be replaced as they
could harbor microorganisms that can contaminate the
fluid.
NOTE: Lubricate the o-rings and threaded fittings with
appropriate waterproof sanitary lubricant during assem-
bly.
1. Install the bushing (113) and wing spacer (115) on
the inner tube (103). Ensure that the wing spacer
flat is properly aligned with the inner tube and install
the o-ring (117).
2. Install non-flared end of the guide sleeve (114) into
the inner tube (103) from the motor end. Push down
into the inner tube until the flared end is against the
end of the inner tube.
3. On the end of the drive shaft (104) without the o-ring
groove, install the seal (105), bearing (107), bearing
spacer (106), bearing (107), and motor coupling
(112).
4. Insert the drive shaft assembly into the inner tube
(103) guide sleeve (114).
5. At the exposed end of the drive shaft, install the
o-ring (116) and the impeller (108). Grasp the motor
coupling and impeller and hand tighten.
6. At the motor end of the inner tube (103) place the
snap ring (111) on the tube for use in the next step.
7. Install the nut (110) and snap ring (111) on the inner
tube (103) connection flange.
8. Install the seal (102) onto the inner tube (103) and
insert the inner tube assembly into the outer tube
(101). Align the drainage slot in the wing spacer with
the drainage slot in the outer tube. Install coupling
(109).
9. Attach the motor to the lower unit by tightening
motor nut (110) hand tight.
10. When installing pump into container, attach the
ground wire to the lower unit as specified in
Grounding on page 6.

Maintenance
3A4586E 19
Models 25C420, 25C421, 25C422, 25C780, 25C781, 25C782
Uninstall the Pump
1. Turn off the motor.
2. Disconnect the motor from the power source and
detach the ground wire from the lower unit.
3. Remove the fluid hose from the pump.
4. Remove the pump from container.
5. Transport the pump to the bench for service.
Disassemble the Pump
NOTE: If removal of any part requires use of a tool for
gripping, use only non-marring tools.
1. Remove the motor:
a. On models 25C420, 25C421, 25C780, or
25C781, remove the motor nut (203).
b. On model 25C422 or 25C782, position the
pump on a flat surface with the motor lying on
its side. Remove the four bolts (305a), motor
(301), motor hanger (302), and motor mount
flange (305).
NOTE: Part references are for model 25C420. The
equivalent parts of other models can be used instead.
2. Insert a rigid rod, such as a screwdriver or long hex
wrench, into the inspection hole of the gear reducer
(205) and position through the center shaft as a
lever to prevent the gear reducer from rotating while
loosening the hex nut in the next step.
3. Using a 4mm hex wrench, loosen the setscrew
(213) and then the hex nut attaching the tube (318)
to the gear reducer (205).
4. Remove the stator tube (220 or 221) from the outer
tube (217).
NOTE: This part is reverse threaded. While facing
the bottom of the stator tube, rotate the stator tube
clockwise to remove.
5. Grasp the stator tube (220 or 221) and push the ring
(218) and stator (219) toward the threaded end of
the stator tube and remove them.
NOTE: The stator has a cutout that aligns with a tab
inside the stator tube which keeps it from rotating
during operation.
6. Remove the outer tube (217) and gasket (212) to
expose the internal drive shaft and other internal
components.
7. Viewing through the inspection hole on the gear
reducer, rotate the drive shaft so that the hole in the
gear reducer drive shaft can be accessed. Insert a
rigid rod through the inspection hole and the hole on
the gear reducer drive shaft. This will allow the drive
shaft to remain stationary while loosening the drive
shaft (209) and items attached to the drive shaft.
8. Remove conical spring (207f), washer, lower o-ring,
lower seal, upper seal, upper o-ring, and mechani-
cal seal bushing.
9. Clean and inspect all components. Replace any
damaged components.
• Moving parts can pinch, cut or amputate fingers
and other body parts. Keep your hands and fingers
away from the pump inlet during operation and
whenever the pump is connected to a power
source.
• Keep hands away from mechanical seal viewing
window on models 25C422 or 25C782.
• The motor on some models is heavy. A single per-
son should not attempt to move or perform mainte-
nance on these models unless precautions are
taken to prevent injury. Do not attempt to discon-
nect a heavy motor while the pump is in a vertical
position.

Maintenance
20 3A4586E
Reassemble After Cleaning
NOTE: Any damaged parts must be replaced as they
could harbor microorganisms that can contaminate the
fluid.
NOTE: Lubricate the o-rings and threaded fittings with
appropriate waterproof sanitary lubricant during assem-
bly.
1. Replace damaged seals or o-rings, as necessary.
Use food grade lubricant on o-rings.
2. Reinstall mechanical seal bushing (206) into gear
reducer (205).
3. Replace upper o-ring (207a), upper seal (207b),
lower seal (207c), noting orientation between both
seals, lower o-ring (207d), washer (207e), spring
(207f) ensuring hook in spring lines up with lower
seal housing hole, washer (207e), and gasket (208).
4. Install the female end of the drive shaft (209) into
the gear reducer (205), use a rigid rod through the
gear reducer observation hole, and tighten the drive
shaft hand tight,
5. Install the gasket (212) and outer tube (217) over
the drive shaft assembly.
6. When the gasket (212) and the flange of the outer
tube (217) meet the bushing (206), the internal drive
shaft assembly is properly inserted and the outer
tube hex nut can be tightened. Use a large wrench
to tighten the hex nut. Tighten the set screw (213).
7. Install the gasket (210) to the male end of the drive
shaft before threading the rotor. Tighten hand tight.
NOTE: Food grade lubricant may be used on the
stator to aid insertion into the stator tube.
8. While aligning the alignment tab on the stator tube
(220 or 221) and the recess on the stator (219),
insert the stator into the threaded end of the stator
tube.
9. Install the ring (218) and stator tube onto the outer
tube (217). Tighten hand-tight.
NOTE: The threads are reverse direction. Tighten
by rotating the stator tube in a counter-clockwise
direction.
10. Attach the motor:
a. For 25C420, 25C421, 25C780, or 25C781
pumps, position the motor over the coupler
(202) and tighten the nut (203) hand tight.
NOTE: In the next step, attach the motor for the
25C422 or 25C782 while it is resting on a hori-
zontal surface. Do not attempt to assemble in a
vertical orientation.
b. For 25C422 or 25C782 pump, align the coupler,
motor, motor hanger, and motor mount flange.
Use two longer bolts to loosely attach the motor
hanger and motor mount flange to two holes on
the motor. Using the four shorter bolts, loosely
attach the motor mount flange to the motor.
After all bolts are inserted, tighten using a
crossing pattern until all bolts are tight. Torque
to 30-36 ft-lb (41-49 N-m).
11. When installing pump into container, attach the
ground wire to the lower unit as specified in
Grounding on page 6.