Graco ToughTek CM20 User manual

3A5202F
EN
Operation
ToughTek®CM20
Continuous Mixers
Electric continuous mixer for water-based cementitous materials. For professional use only.
Not approved for use in explosive atmospheres or hazardous locations.
100 psi (0.69 MPa, 6.9 bar) Maximum Water Inlet Pressure
See page 2 for model information and approvals.
Important Safety Instructions
Read all warnings and instructions in this
manual. Save these instructions.
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23A5202F
Contents
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Component Identification . . . . . . . . . . . . . . . . . . . . 5
CM20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Mix-head Assembly . . . . . . . . . . . . . . . . . . . . . . . 6
Water Control Assembly . . . . . . . . . . . . . . . . . . . 6
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Assemble Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Prepare Unit for Operation . . . . . . . . . . . . . . . . . 8
Water Connections . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Components . . . . . . . . . . . . . . . . . . . 10
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Changing Material and Storing Equipment . . . . 14
Remove Mixer from Cart Stand . . . . . . . . . . . . 15
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Preventive Maintenance Schedule . . . . . . . . . . 16
Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
25M530 (120 Volt) Series B . . . . . . . . . . . . . . . 19
25M530 (120 Volt) Series A . . . . . . . . . . . . . . . 19
25M563 (230 Volt) . . . . . . . . . . . . . . . . . . . . . . . 20
Mixing Shaft Factory Configuration . . . . . . . . . . 21
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Mixer Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 22
Mixing Shaft Assembly (17T457) . . . . . . . . . . . . 25
Water Control Assembly . . . . . . . . . . . . . . . . . . 26
120 V Control Box Assembly (17T351) . . . . . . . 28
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Technical Specifications . . . . . . . . . . . . . . . . . . . . 31
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 32
Models
Related Manuals
Accessories
Model Voltage Amperage Power Approvals
25M530
Series B
120 V / 60 Hz 15 A 1.5 HP
25M563
Series A
230 V / 50 Hz 16 A 2.2 kW
Part Description
3A4361 ToughTek Rotor/Stator Pumps
3A3437 ToughTek S340e Portable Stucco Pump
Part Description
17T019 ACCESSORY, lid, hopper

Warnings
3A5202F 3
Warnings
The following warnings are for the setup, use, grounding, maintenance, and repair of this equipment. The
exclamation 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 or on warning labels, 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
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.
• Before checking, moving, or servicing equipment, relieve pressure and disconnect all power
sources.
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 before servicing equipment.
• Connect only to grounded electrical outlets.
• Ensure ground prongs are intact.
• Do not expose to rain. Store indoors.
• All electrical wiring must be done by a qualified electrician and comply with all local codes and
regulations.

Warnings
43A5202F
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 Specifications in all equipment manuals.
• Use fluids and solvents that are compatible with equipment wetted parts. See Technical Specifi-
cations in all equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete
information about your material, request Safety Data Sheets (SDSs) from distributor or retailer.
• Do not leave the work area while equipment is energized or under pressure.
• Turn off all equipment and relieve pressure 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. Alterations or modifications may void agency approvals and create
safety hazards.
• 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.
PRESSURIZED EQUIPMENT HAZARD
Fluid from the equipment, leaks, or ruptured components can splash in the eyes or on skin and cause
serious injury.
• Relieve pressure when you stop spraying/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.
TOXIC FLUID OR FUMES HAZARD
Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin, inhaled, or
swallowed.
• Read Safety Data Sheets (SDSs) to know the specific hazards of the fluids you are using.
• Store hazardous fluid in approved containers, and dispose of it according to applicable guidelines.
PERSONAL PROTECTIVE EQUIPMENT
Wear appropriate protective equipment when in the work area to help prevent serious injury, including
eye injury, hearing loss, inhalation of toxic fumes, and burns. Protective 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

Component Identification
3A5202F 5
Component Identification
CM20
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Ref. Description
A Hopper
B Cart stand
BA 2 Frame safety pins
BB Rear toggle latch
BBA Rear toggle latch clip
C Motor assembly
CA Motor alignment pin
CAA Motor alignment pin clip
CAB Motor alignment pin washer
CB Motor power cable
CD Grease fitting
D Water control assembly
(see detail view for components)
E Electrical Box
EA On/Off switch
EB Circuit breaker reset
F Mix-head assembly (see detail view for com-
ponents)
FF Discharge nozzle
G 2 Hopper ring pins
H Hopper grate and bag breaker
HH Grate retaining screw
Ref. Description

Component Identification
63A5202F
Mix-head Assembly
Water Control Assembly
Ref. Description
FA Mixing tube
FAA Mixing tube toggle latches
FB Mixing shaft
FBB Mixing shaft pins
FC Throat insert
FCC Water dosing port
FD Material dosing auger shaft
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Ref. Description
DA Water accessory fitting
DB Water accessory shut-off ball valve
DC Water supply inlet
DCC Inlet screen
DD Water pressure regulator
DE Water control solenoid
DF Water metering valve
DG Twist-claw outlet fitting/hose
ti31358a
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Setup
3A5202F 7
Setup
Assemble Unit
If unit is already assembled, continue to Prepare Unit
for Operation.
1. Unfold cart legs and stand cart upright.
2. Install frame safety pins (BA) at front and rear of
cart.
3. Using a two-person lift, place the hopper (A) on top
of the cart frame. Secure the hopper to both sides of
cart using the hopper ring pins (G).
4. Fully insert the material dosing auger shaft (FD) into
the rear end of the hopper (A).
5. Insert mix shaft (FB) into mix tube (FA). Install shaft
and tube onto hopper (A).
a. Align mixing shaft pins (FBB) to slots in the
material dosing auger shaft (FD) and verify that
pins and shaft are fully engaged.
b. Firmly connect mixing tube (FA) to hopper (A).
Secure mixing tube toggle latches (FAA).
6. Lift the motor assembly (C) so that it connects to the
material dosing auger shaft (FD). Immediately
secure the motor to the hopper with the motor
alignment pin (CA). Ensure the pin has slid
completely into place. Slide motor alignment pin
washer (CAB) over the end of the alignment pin
(CA). Secure alignment pin with motor alignment pin
clip (CAA).
7. Engage the rear toggle latch (BB) on the rear cart
leg. Secure with rear toggle latch clip (BBA).
8. Connect motor power cable (CB).
During assembly, the cart could collapse and crush
fingers and other body parts. To avoid possible injury,
make sure all clips and pins are securely in place and
the mixer is on level ground.
Be sure to properly support the mixer with a two-per-
son lift during transport. Do not suspend from crane
or hoist. The mixer is heavy and can crush fingers
and other body parts.
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Setup
83A5202F
Prepare Unit for Operation
1. Verify that the front leg hitch clip (BA) is installed
and the hopper is secured to both sides of the frame
with hopper ring pins (G).
2. Verify that the motor toggle latch (BB), located on
the rear cart leg, is engaged with the motor mount
and secured with a rear toggle-latch clip (BBA) and
frame safety pin (BA).
3. Verify that the motor (C) is securely mounted. The
motor alignment pin (CA) must be installed and
secured with a motor alignment pin washer (CAB)
and motor alignment pin clip (CAA).
4. Verify that switch (EA) is in the off position, then
connect the motor power cable (CB).
5. Verify that both mix tube toggle latches (FAA) on
mixing tube (FA) are latched with their locking tabs
engaged.
During setup, the cart could collapse and crush fin-
gers and other body parts. To avoid possible injury,
make sure all clips and pins are in place, ensure the
mixer is on level ground, and always complete steps 1
and 2 before beginning setup or moving equipment.
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Setup
3A5202F 9
6. Verify that the hopper grate (H) is installed with the
bag breaker pointing up. Ensure the hopper grate is
secured with the grate retaining screw (HH).
7. Position the discharge nozzle (FF) of the mixer over
a pump hopper, wheel barrow, or other receptacle.
The mixer should always be used on a horizontal
surface so it is secure and stable.
Water Connections
1. Close the water accessory shut-off ball valve (DB).
2. Ensure the water supply pressure is between
30-100 psi. The water pressure regulator (DD) has
been preset to 30 psi and does not usually require
adjustment.
NOTE: The water pressure regulator (DD) reduces
the supply pressure to a constant value so that the
water metering valve (DF) does not need to be
adjusted due to fluctuations in supply pressure. The
water pressure regulator (DD) must be set below
the minimum pressure expected from the water
supply(s) used, and if necessary can be set down to
25 psi (1.6 bar, 0.16 MPa).
3. Connect water supply hose (WH) to water supply
inlet (DC).
4. Turn on water supply.
To help prevent injury from moving parts, do not
operate with the grate (H) or mixing tube (FA)
removed.
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Setup
10 3A5202F
Electrical Components
NOTE: Certain 120 V GFCI outlets have been known to
trip while using this product. GFCI outlets have a range
of sensitivities. Motor controllers can cause false trips of
GFCI outlets. If you experience issues while using this
product, switch to a different GFCI model.
1. Only use a grounded power cord. Plug the cord into
the wall outlet.
2. Verify that the On/Off switch (EA) is in the OFF posi-
tion. Plug the power cord (PC) to the electrical box
(E).
Grounding
The system is grounded through the power cord (PC).
Power Supply Requirements
Model Voltage Circuit Protection
25M530 110-120 V 15 A Circuit Breaker
25M563 220-230 V 16 A Circuit Breaker
Minimal Power Cord Wire Gauge
Length (ft) Wire Gauge (AWG)
25 16
50 12
100 10
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EA
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.
Grounding provides an escape wire for the electric
current.

Operation
3A5202F 11
Operation
1. Complete Setup, page 7.
2. Fill the hopper (A) with dry material.
Set the bag in the center of the hopper grate (H) so
the bag breaker teeth engage the center of the bag.
Twist the bag approximately 15 degrees in both
directions to rip the bag open. Lift both ends of the
bag so the dry materials falls out of the bag and into
the hopper.
NOTE: Keep hopper level as close to the grate as
possible to achieve maximum output and consistent
water content.
3. Turn the unit on by moving switch (EA) into the ON
position.
NOTE: The water control solenoid (DE) will
automatically open when the unit is turned on.
4. Adjust the water metering valve (DF) until the
material is the correct consistency.
NOTE: It takes time for the mixed material to travel
through the tube. Avoid making over-adjustments.
Make small adjustments and wait 10-15 seconds to
allow the material to travel through the tube before
making another adjustment.
5. If desired, pause the output during operation by
starting and stopping the unit using the On/Off
switch (EA).
To help prevent injury from moving parts, do not
operate with the grate (H) or mixing tube (FA)
removed.
Adding material to the hopper generates clouds of
dust and exposes the user to the sharp teeth on the
hopper grate (H). Always wear protective equipment
when adding material to the hopper.
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NOTICE
To prevent damage to mix-head assembly, do not
allow material to cure in mix-head assembly. Follow
Changing Material and Storing Equipment, page
14.
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Operation
12 3A5202F
Shutdown
1. Let the hopper run out of dry material.
2. Turn off the water supply while mixer is running to
relieve pressure.
3. Turn the unit off by flipping the switch to the OFF
position.
4. Unplug the power cord (PC) from the mixer.
5. Depressurize/drain water control assembly (D) by
opening water accessory ball valve.
6. Disconnect water supply.
7. Disconnect the motor power cable (CB).
8. Disengage both mix tube toggle latches (FAA) and
remove mix-head assembly (F).
9. Pull the mixing shaft (FB) out of the mixing tube (FA)
and flush both with water and a brush. Make sure all
of the mixing elements on the mixing shaft are
clean.
10. Clean the face of the throat insert (FC).
11. Clean out water dosing port (FCC).
Avoid contact with the discharge nozzle (FF), mix shaft
(FB), and material dosing auger shaft (FD) during shut
down. These parts can pull in, crush, cut, or amputate
fingers and other body parts.
NOTICE
To prevent damage to the water control assembly (D),
drain water from unit if it is to be stored for extended
periods of time or in freezing temperatures. Follow
Changing Material and Storing Equipment, page
14.
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NOTICE
To prevent damage to mix-head assembly, do not
allow material to cure in mix-head assembly.
Do not use pressurized water jets to clean electrical
box, motor, capacitors, or wires. Use of pressurized
water jets can cause water to enter the electrical con-
trols and increase potential for electric shock.
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Operation
3A5202F 13
12. Reinstall the mixing tube assembly onto the throat
insert. Ensure the pins (FBB) on the mixing shaft
(FB) line up with the slots in the material dosing
shaft (FD).
NOTE: Hopper lid accessory (17T019) can be used to
keep excess material in hopper dry.
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Operation
14 3A5202F
Changing Material and Storing
Equipment
1. Follow Shutdown, page 12, steps 1-11. Do not
reconnect fittings or reinstall mixing tube.
2. Vacuum and/or hose down the hopper and dosing
shaft. Make sure all the dosing/breaker elements
are clean.
3. For storage and use in freezing temperatures:
Drain the water. Remove twist-claw irrigation fitting
(DG) and open water accessory ball-valve (DB).
Carefully tilt the unit to allow water to drain from
both ends of the water control assembly (D), which
is separated by the closed water control solenoid
(DE). Ensure water has also been drained from the
water output hose and water dosing port (FCC) in
the throat insert (FC).
4. Reconnect all fittings and reinstall the mixing tube
assembly onto the throat insert. Ensure the pins
(FBB) on the mixing shaft (FB) line up with the slots
in the material dosing shaft (FD).
Avoid contact with the discharge nozzle (FF), mix shaft
(FB), and material dosing auger shaft (FD) during
preparation for changing material or storing equip-
ment. These parts can pull in, crush, cut, or amputate
fingers and other body parts.
Do not use pressurized water jets to clean electrical
box, motor, capacitors, or wires. Use of pressurized
water jets can cause water to enter the electrical con-
trols and increase potential for electric shock.
NOTICE
If water is used to clean hopper (A) or material dosing
auger shaft (FD), allow equipment to fully dry before
placing more dry material in the hopper. A wet hopper
or auger shaft can cause dry material to cure onto
mixer parts.
NOTICE
If working in a cold environment, failure to drain water
from the water control assembly (D) could cause
damage to the system due to freezing water.
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Operation
3A5202F 15
Remove Mixer from Cart Stand
1. Follow the Shutdown procedure on page 12, then
perform the Changing Material and Storing
Equipment procedure on page 14.
2. Make sure both frame pins (BA) are in place.
3. Remove the motor:
a. Disconnect the motor power cable (CB).
b. Remove the rear toggle-latch clip (BBA), then
open the rear toggle latch (BB).
c. Support the motor, then remove the motor
alignment pin clip (CAA), motor alignment pin
washer (CAB), and the motor alignment pin
(CA). Set the motor aside.
4. Disengage both mixing tube toggle latches (FAA)
and remove the mix-head assembly (F).
5. Remove hopper ring pins (G).
6. Remove mixer. Lift the mixer off of the stand.
7. If desired, fold the cart stand for storage
convenience.
a. Remove frame pins (BA).
b. Flip the cart stand upside down and lay on a
level surface.
c. Align cart stand legs and fold together.
8. For assembly, see Assemble Unit, page 7.
Be sure to properly support the mixer with a
two-person lift during removal. Do not suspend from
crane or hoist. The mixer is heavy and can crush
fingers and other body parts.
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Maintenance
16 3A5202F
Maintenance
Preventive Maintenance Schedule
Disposal
At the product’s end-of-life, recycle the equipment in a responsible manner, per local regulations.
• The series A 25M530 mixer motor contains electronic circuit boards that may need to be removed and recycled
separately from other components.
• Mixers contain lubricating grease in the motor coupler joint and in the gear-box. This grease may need to be
flushed/drained and recycled separately from other components.
Routine Inspection Frequency
Ensure all protective clips, ring pins, latches, grating, fasteners, housings, and
enclosures are installed and in good working order, functioning properly, and free of
excessive wear, cracks, or corrosion.
Before every use
Ensure all electrical components, cabling, and motor are properly assembled so
that they are sealed from water ingress, free of debris, and in good working order.
Ensure all warning labels are clean and easily readable.
Grease Frequency
Motor grease fitting (CD) Shell Gadus S2 V220 2 (formerly
Shell Retinax EP2) or an
equivalent NLGI Grade 2 grease
compatible with rubber.
Ensure any grease used is
compatible. Do not mix grease
types.
Monthly
Gear-box CLP ISO VG220 gear oil or
equivalent.
Ensure any oil used is compatible.
Do not mix oil types.
10,000 hours or 3 years
(whichever comes first)
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Troubleshooting
3A5202F 17
Troubleshooting
1. Follow Shutdown, page 12, before checking or
repairing mixer.
Problem Cause Solution
Poor mix quality Mixing shaft configuration can
significantly affect mix quality.
Reconfigure mixing shaft. Refer to Mixing
Shaft Factory Configuration, page 21, for
recommended configuration.
Buildup of cured material. Clean any debris or cured material on or
inside the motor coupler, dosing auger, mix
shaft, throat insert, or mix tube assembly.
Excessive wear on mix tube end
cap, or mixing element at the
discharge end.
The Mixing Shaft Bushing needs
to be replaced.
Replace mixing shaft bushing.
Aggregate is too large. Refer to Technical Specifications, page 31,
for maximum aggregate size.
Motor will not run 120 V model only: The mixer has
been installed on a GFCI circuit.
Check to see if a GFCI circuit is in use and
has tripped. If a GFCI circuit has tripped,
connect to an outlet with a different GFCI
model.
NOTE: Certain 120 V GFCI outlets have
been known to trip while using this product.
GFCI outlets have a range of sensitivities.
Motor controllers can cause false trips of
GFCI outlets.
The circuit breaker has tripped. Reset circuit breaker switch (EB).
Main power has turned off. Check all cord connections are secure and
voltage is correct.
Motor power cable (CA) is
disconnected.
Reconnect motor power cable (CA).
Motor stalling or, failing to get to
full speed
Excessive tension/friction on the
mix shaft and dosing auger.
Loosen both mix tube toggle latches (FAA).
The latches are too tight if the metal frame
on the mix tube bows outwards.
Loosen the motor toggle latch if it is too tight.
Clean any debris or cured material on or
inside the motor coupler, dosing auger, mix
shaft, throat insert, or mix tube assembly.
Material in mix tube has fully or
partially cured.
Follow the Shutdown procedure (page 12)
and retry.

Troubleshooting
18 3A5202F
Material water consistency Inlet water pressure is fluctuating
below the regulator-set pressure.
The water pressure regulator (DD) reduces
the pressure at the water metering valve
(DF) to a constant value. Adjust the water
pressure regulator (DD) so the pressure is
less than the lowest pressure possible from
water supply.
Water pressure and flow is
constant, but there is less dry
material entering mix tube.
There is not enough dry material in the
hopper. Add more dry material to the hopper,
and keep adding dry material to maintain the
level as close to the hopper grate as
possible.
The material dosing auger shaft (FD) is dirty
or worn and needs to be cleaned or
replaced.
There is a debris in the water
control assembly (D).
Verify the water inlet screen (DCC) is in
place and that it is clean.
Disassemble the water assembly and clean
any debris.
Clean debris from water dosing port (FCC).
Water does not turn on, low
flow, or water does not turn off.
Solenoid damaged or clogged with
debris.
Clean or replace water control solenoid (DE).
Incorrect solenoid installed. The solenoid must be “normally closed” type.
Use only genuine Graco replacement parts.
There is debris in the water control
assembly (D).
Verify the water inlet screen (DCC) is in
place and that it is clean.
Disassemble the water control
assembly (D) and clean any
debris.
Clean debris from water dosing port (FCC).
Problem Cause Solution

Schematics
3A5202F 19
Schematics
25M530 (120 Volt) Series B
25M530 (120 Volt) Series A

Schematics
20 3A5202F
25M563 (230 Volt)