Page 1
OPERATION MANUAL
SERIES
MODEL PRO20
HYDRAULIC PLASTER/MORTAR MIXER
(VANGUARD 18HP GASOLINE ENGINE)
Revision #0 (04/17/19)
To find the latest revision of this
publication, visit our website at:
www.multiquip.com
THIS MANUAL MUST ACCOMPANY THE EQUIPMENT AT ALL TIMES.
Page 2
PROPOSITION 65 WARNING
Engine exhaust and some of
its constituents, and some dust created
by power sanding, sawing, grinding,
drillingandotherconstructionactivities
contains chemicals known to the State
of California to cause cancer, birth
defects and other reproductive harm.
Some examples of these chemicals are:
Leadfromlead-basedpaints.
Crystallinesilicafrombricks.
Cementandothermasonryproducts.
Arsenicandchromiumfromchemically
treatedlumber.
Your risk from these exposures varies,
dependingonhowoftenyoudo this type
of work. To reduce your exposure to
these chemicals: work in aALWAYS
well ventilated area, and work with
approved safety equipment, suchas
dust masks that are specially designed
to filter out microscopic particles.
PAGE 2 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 3
SILICOSIS/RESPIRATORY WARNINGS
WARNING
SILICOSIS WARNING RESPIRATORY HAZARDS
Grinding/cutting/drilling of masonry, concrete, metal and
other materials with silica in their composition may give
off dust or mists containing crystalline silica. Silica is a
basic component of sand, quartz, brick clay, granite and
numerous other minerals and rocks. Repeated and/or
substantial inhalation of airborne crystalline silica can
cause serious or fatal respiratory diseases, including
silicosis.In addition, California and some other
authorities have listed respirable crystalline silica as a
substance known to cause cancer. When cutting such
materials, always follow the respiratory precautions
mentioned above.
WARNING
Grinding/cutting/drilling of masonry, concrete, metal and
other materials can generate dust, mists and fumes
containing chemicals known to cause serious or fatal
injury or illness, such as respiratory disease, cancer,
birth defects or other reproductive harm. If you are
unfamiliar with the risks associated with the particular
process and/or material being cut or the composition of
the tool being used, review the material safety data
sheet and/or consult your employer, the material
manufacturer/supplier, governmental agencies such as
OSHA and NIOSH and other sources on hazardous
materials. California and some other authorities, for
instance, have published lists of substances known to
cause cancer, reproductive toxicity,or other harmful
effects.
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 3
Control dust, mist and fumes at the source where
possible. In this regard use good work practices and
follow the recommendations of the manufacturers or
suppliers, OSHA/NIOSH, and occupational and trade
associations.Water should be used for dust
suppression when wet cutting is feasible. When the
hazards from inhalation of dust, mists and fumes cannot
be eliminated, the operator and any bystanders should
always wear a respirator approved by NIOSH/MSHA for
the materials being used.
Page 4
PRO20 Hydraulic Mixer
Proposition 65 Warning ........................................... 2
Silicosis/Respiratory Warnings ................................ 3
Table of Contents ..................................................... 4
Safety Information ............................................... 5–9
Specifications ........................................................ 11
Dimensions ............................................................ 12
General Information ............................................... 13
Components (Mixer) ........................................ 14–15
Components (Engine) ............................................ 16
Paddle Blade Adjustment ...................................... 17
Inspection ........................................................ 18–20
Operation ......................................................... 21–24
Maintenance .................................................... 25–28
Troubleshooting (Engine) ................................. 29–30
Troubleshooting (Mixer) ......................................... 31
Hydraulic System Locator ...................................... 32
Hydraulic System Diagram .................................... 33
Hydraulic Hose Connections ................................. 34
TABLE OF CONTENTS
NOTICE
Specifications are subject to change without notice.
PAGE 4 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 5
SAFETY INFORMATION
Do not operate or service the equipment before reading
the entire manual. Safety precautions should be followed
at all times when operating this equipment.
Failure to read and understand the safety
messages and operating instructions could
result in injury to yourself and others.
SAFETY MESSAGES
The four safety messages shown below will inform you
about potential hazards that could injure you or others. The
safety messages specifi cally address the level of exposure
to the operator and are preceded by one of four words:
DANGER, WARNING, CAUTION
SAFETY SYMBOLS
Potential hazards associated with the operation of this
equipment will be referenced with hazard symbols which
may appear throughout this manual in conjunction with
safety messages.
DANGER
Indicates a hazardous situation which, if not avoided,
WILL result in DEATH or SERIOUS INJURY.
WARNING
Indicates a hazardous situation which, if not avoided,
COULD result in DEATH or SERIOUS INJURY.
CAUTION
Indicates a hazardous situation which, if not avoided,
COULD result in MINOR or MODERATE INJURY.
or NOTICE.
Symbol Safety Hazard
Lethal exhaust gas hazards
Explosive fuel hazards
Burn hazards
Rotating parts hazards
Hydraulic fluid hazards
NOTICE
Addresses practices not related to personal injury.
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 5
Page 6
SAFETY INFORMATION
GENERAL SAFETY
NOTICE
This equipment should only be operated by trained and
Whenever necessary, replace nameplate, operation and
Manufacturer does not assume responsibility for any
accident due to equipment modifi cations. Unauthorized
use accessories or attachments that are not
recommended by Multiquip for this equipment. Damage
keep
. Also, know the phone numbers
.
This information will be invaluable in the case of an
CAUTION
NEVER operate this equipment without proper protective
clothing, shatterproof glasses, respiratory protection,
hearing protection, steel-toed boots and other protective
devices required by the job or city and state regulations.
Avoid wearing jewelry or loose-fi tting clothes that may
snag on the controls or moving parts as this can cause
serious injury.
NEVER operate this equipment when not
feeling well due to fatigue, illness or when
on medication.
NEVER operate this equipment under the
infl uence of drugs or alcohol.
ALWAYS clear the work area of any debris, tools, etc.
that would constitute a hazard while the equipment is
in operation.
ALWAYS check the equipment for loosened threads or
bolts before starting.
NEVER use the equipment for any purpose other than
its intended purposes or applications.
qualifi ed personnel 18 years of age and older.
safety decals as they become diffi cult read.
equipment modifi cation will void all warranties.
NEVER
to the equipment and/or injury to user may result.
ALWAYS know the location of the nearest
fi re extinguisher.
ALWAYS know the location of the nearest
fi rst aid kit.
ALWAYS know the location of the nearest phone or
a phone on the job site
of the nearest ambulance, doctor and fi re department
emergency.
PAGE 6 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 7
SAFETY INFORMATION
MIXER SAFETY
ENGINE SAFETY
Engine fuel exhaust gases contain poisonous carbon
monoxide. This gas is colorless and odorless, and can
The engine of this equipment requires an adequate
operate this equipment
place hands or fingers inside the engine
operate the engine with heat shields or guards
remove the engine oil drain plug while the engine
is hot. Hot oil will gush out of the oil tank and severely
Make certain the operator knows how to and is capable
run the engine without an air fi lter or with a dirty
air fi lter. Severe engine damage may occur. Service the
NEVER operate the equipment in an
explosive atmosphere or near combustible
materials. An explosion or fi re could result
causing severe bodily harm or even death.
NEVER mix fl ammable or explosive substances.
NEVER place your hands inside the drum
while starting or operating this equipment.
NEVER disconnect any emergency
or safety devices. These devices are
intended for operator safety. Disconnection of these
devices can cause severe injury, bodily harm or even
death. Disconnection of any of these devices will void
all warranties.
Before operating the mixer, ensure that the safety grate
is in position and correctly fi tted.
If applicable, NEVER use your hand
to find hydraulic leaks. Use a piece
of wood or cardboard. Hydraulic fluid
injected into the skin must be treated by a
knowledgeable physician immediately or
severe injury or death can occur.
NEVER lubricate components or attempt service on a
running machine.
NOTICE
ALWAYS keep the machine in proper running condition.
ALWAYS ensure the mixer is on level ground before mixing.
Fix damage to the machine and replace any broken
parts immediately.
ALWAYS store equipment properly when it is not being
used. Equipment should be stored in a clean, dry location
out of the reach of children and unauthorized personnel.
ALWAYS deploy stabilizer jack stands prior to use.
DANGER
WARNING
CAUTION
DANGER
cause death if inhaled.
free fl ow of cooling air. NEVER
in any enclosed or narrow
area where free fl ow of the
air is restricted. If the air
fl ow is restricted it will cause
injury to people and property
and serious damage to the
equipment or engine.
WARNING
NEVER
compartment while the engine is running.
NEVER
removed.
NEVER
scald any persons in the general area of the mixer.
CAUTION
NEVER touch the hot exhaust manifold,
muffl er or cylinder. Allow these parts to cool
before servicing the equipment.
of turning the engine OFF in case of an emergency.
NOTICE
NEVER
air fi lter frequently to prevent engine malfunction.
NEVER tamper with the factory settings
of the engine or engine governor. Damage
to the engine or equipment can result
if operating in speed ranges above the
maximum allowable.
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 7
Page 8
SAFETY INFORMATION
FUEL SAFETY
TRANSPORTING SAFETY
allow any person or animal to stand underneath
make sure forklift forks are inserted as far as
Tighten the fuel tank cap securely and close the fuel
secure the equipment during transport by tying
tip the engine to extreme angles during lifting
as this may cause oil to enter the cylinder head, making
DANGER
DO NOT add fuel to the equipment if it is placed inside
a truck bed with a plastic liner. The possibility exists of
explosion or fi re due to static electricity.
NEVER start the engine near spilled fuel or combustible
fl uids. Fuel is extremely fl ammable and its vapors can
cause an explosion if ignited.
CAUTION
NEVER
the equipment while it is being lifted.
NOTICE
FUEL
FUEL
ALWAYS
possible into the forklift pockets when lifting the mixer.
ALWAYS shut down the engine before transporting.
NEVER lift the equipment while the engine is running.
cock to prevent fuel from spilling.
NEVER lift the machine to unnecessary heights.
ALWAYS
down the equipment with rope.
NEVER
the engine diffi cult to start.
ALWAYS refuel in a well-ventilated area, away from
sparks and open fl ames.
ALWAYS use extreme caution when working with
fl ammable liquids.
NEVER fi ll the fuel tank while the engine is running or hot.
DO NOT overfi ll the tank, as spilled fuel can ignite if it
comes into contact with hot engine parts or sparks from
the ignition system.
Store fuel in appropriate containers, in well-ventilated
areas and away from sparks and fl ames.
NEVER use fuel as a cleaning agent.
NEVER smoke around or near the
equipment. Fire or explosion could result
from fuel vapors or if fuel is spilled on a
hot engine.
PAGE 8 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 9
SAFETY INFORMATION
ENVIRONMENTAL SAFETY/DECOMMISSIONING
Decommissioning is a controlled process used to safely
retire a piece of equipment that is no longer serviceable.
If the equipment poses an unacceptable and unrepairable
safety risk due to wear or damage, or is no longer cost
effective to maintain (beyond life-cycle reliability) and is to
be decommissioned (demolition and dismantlement), be
sure to follow the rules below.
EMISSIONS INFORMATION
The gasoline engine used in this equipment has been
designed to reduce harmful levels of carbon monoxide
(CO), hydrocarbons (HC) and nitrogen oxides (NOx)
This engine has been certifi ed to meet US EPA evaporative
Attempts to modify or make adjustments to the engine
emission system by unauthorized personnel without proper
training could damage the equipment or create an unsafe
Additionally, modifying the fuel system may adversely affect
evaporative emissions, resulting in fi nes or other penalties.
The emission control label is an integral part of the emission
If a replacement emission label is needed, please contact
NOTICE
NEVER pour waste or oil directly onto the ground, down
a drain, or into any water source.
Contact your country’s Department of
Public Works or a recycling agency in your
area and arrange for proper disposal of
any electrical components, waste or oil
associated with this equipment.
When the life cycle of this equipment is over, remove
the battery (if equipped) and bring it to an appropriate
facility for lead reclamation. Use safety precautions when
handling batteries that contain sulfuric acid.
NOTICE
contained in gasoline exhaust emissions.
emissions requirements in the installed confi guration.
condition.
Emission Control Label
system and is strictly controlled by regulation(s).
The label must remain with the engine for its entire life.
When the life cycle of this equipment is over, it is
recommended that the mixer frame and all other metal
parts be sent to a recycling center.
Metal recycling involves the collection of metal from
discarded products and its transformation into raw
materials to use in manufacturing a new product.
Recyclers and manufacturers alike promote the process
of recycling metal. Using a metal recycling center
promotes energy cost savings.
your authorized engine distributor.
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 9
Page 10
NOTES
PAGE 10 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 11
Table 1. Mixer Specifications
Capacity 20.0 ft.³ (566 liters)
Bag Capacity 6–7 bags
Shipping Weight 2,004 lb. (909 kg)
Maximum Aggregate Size 1 in. (25.4 mm)
SPECIFICATIONS
Adjustable Drum
Discharge Height
Drive System Hydraulic
Dump Action Hydraulic
Table 2. Engine Specifications
Model Briggs & Stratton Vanguard
Type
Bore × Stroke 2.83 in. × 2.76 in. (72 mm × 70 mm)
Displacement 34.7 in.³ (570 cm³)
Compression Ratio 8.2:1
Max. Output 18.0 hp (13.4 kW) @ 3,600 rpm
Fuel Tank Capacity Approx. 3.0 US gallons (11.4 liters)
Fuel Type Min. 87 octane unleaded gasoline
Lube Oil Capacity 48 oz. (1.4 liters)
Speed Control Method Centrifugal flyweight type
horizontal shaft, gasoline engine
24.0–42.5 in.
(584–1,092 mm)
Air-cooled, four-stroke,
Starting Method Electric start
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 11
Page 12
B
DIMENSIONS
C
A
Table 3. Mixer Dimensions
Designator Dimension in. (mm)
A
B
C
D
E
F
G
Length (Legs Retracted) 95.7 (2,431)
Length (Legs Extended) 125.5 (3,188)
Height (Dump Position) 43.5 (1,105)
Width (Legs Retracted) 44.9 (1,142)
Width (Legs Extended) 50.5 (1,283)
Height (Legs Retracted) 48.0 (1,219)
Height (Legs Extended) 67.3 (1,709)
Figure 1. Mixer Dimensions
F
G
D
E
PAGE 12 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 13
GENERAL INFORMATION
APPLICATION
The Multiquip PRO20 hydraulic mixer is shipped completely
assembled, factory tested, and ready for use. With a drum
capacity of 20 cubic feet (566 liters), the PRO20 has a
batch capacity of 6 to 7 bags.
WARNING
The PRO20 is intended only for the mixing of plaster
and mortar. The mixer must be used for its intended
purpose and is not suitable for mixing flammable or
explosive substances. The mixer must not be used
in an explosive atmosphere.
FEATURES AND BENEFITS
The PRO20 hydraulic mixer includes:
A thick, 1/4-inch drum wrap with 3/8-inch ends to resist
abrasion.
A high-torque hydraulic motor with integral relief.
ENGINE
The PRO20 mixer is powered by an 18-horsepower,
Briggs & Stratton Vanguard gasoline engine. Refer to
Table 2 for engine specifications.
For basic engine maintenance, refer to the engine
maintenance section in this manual. For more detailed
engine maintenance, refer to the engine owner’s manual
supplied with the engine.
STABILIZERS
The PRO20 is equipped with four adjustable stabilizer jack
stands, including two swivel jack stands that swivel outward
to provide additional support and stability. ALWAYS deploy
the stabilizer jack stands prior to use.
Over-center dumping and adjustable height which
enables loading at waist level, reducing operator fatigue.
A built-in spill plate which directs excess material back
into the tub, minimizing waste.
Convenient access forklift pockets that are approachable
from any side of the mixer.
Readily accessible drive and dump controls located
above the engine cowling.
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 13
Page 14
COMPONENTS (MIXER)
5
4
3
2
1
6
14
13
7
12
8
9
10
16
11
15
14
21
20
PAGE 14 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
19
17
13
18
Figure 2. Mixer Components
Page 15
COMPONENTS (MIXER)
1. Mixing Paddles — This mixer is equipped with rubber
mixing blades for the mixing of plaster and mortar.
ALWAYS clean the paddles after each use.
2. Bag Cutter — This feature allows mixing bags to be
opened easily, allowing the contents of the bag to fall
directly into the mixing drum.
3. Hydraulic Motor — Bidirectional hydraulic motor is
used in conjunction with the directional control valve to
operate the hydraulic dump cylinder and paddle shaft.
4. Hydraulic Paddle Control Lever — Push this
three-position lever inward for clockwise rotation of
the paddle blades. Place in the center position for no
rotation (neutral/off).
5. Hydraulic Dump Lever — Push this lever inward to
activate the dump cylinders.
6. Latch — Use this latch to secure the engine
compartment enclosure.
7. Hydraulic Pump — Supplies hydraulic fluid to the
hydraulic control valve.
8. Hydraulic Oil Sight Gauge — This gauge indicates
the level and temperature of the hydraulic oil. For
normal operation, the oil level should be visible at the
midpoint on the sight gauge.
9. Adjustable Stabilizer Jack Stands — Use these jack
stands to adjust the mixer to the desired height.
12. Drum Bearing — There is a pillow block bearing on
each end of the mixing drum. Bearings require daily
greasing with lithium-based EP grease.
13. Hydraulic Dump Cylinder — When activated, these
cylinders will cause the mixing drum to rotate to the
dump position.
14. Pivot Point/Zerk Fitting — There is a Zerk grease
fitting on each end of the mixing drum. These fittings
lubricate the dumping mechanism. Lubricate both
fittings at least twice a week.
15. Emergency Stop Switch — This switch is located
on the side of the engine cover. When activated, it will
shut down the engine.
16. Safety Grill — Provided for operator safety. This safety
grill is designed to keep hands and solid objects out
of the mixing drum when in use. This grill should be
closed at all times while the mixer is in use. DO NOT
remove the grill or grill opening bar. Keep the grill clean
by washing it down daily.
17. Forklift Pockets — When lifting of the mixer is
required, use these forklift pockets to lift the mixer.
Remember to insert the forks of the forklift a minimum
of 24 inches into the forklift pockets.
18. Hydraulic Oil Filter — 10-micron hydraulic filter. Filters
out small particles that are harmful to the hydraulic
system.
10. Mixing Drum — Drum capacity is 20 cubic feet
(566 liters). Mixing materials such as mortar and plaster
are placed into this drum for mixing. ALWAYS clean
the drum after each use.
11. Shaft Seals — There is a Zerk grease fitting at each
end of the mixing drum. These grease fittings lubricate
the paddle shaft seals. Fittings require daily greasing
with lithium-based EP grease.
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 15
19. Hydraulic Valve — Directional hydraulic control valve.
Controls the direction of hydraulic fluid supplied to the
dump cylinder and paddle shaft.
20. Swivel Jack Stands — These jack stands swivel out
to support the mixer.
21. Engine Cover — Lift this cover to gain access to the
engine.
Page 16
COMPONENTS (ENGINE)
1
8
10
9
3
5
6
7
Figure 3. Engine Components
1. Air Cleaner — Prevents dirt and other debris from
entering the fuel system. Turn the knobs on the sides of
the air cleaner cover to gain access to the filter element.
NOTICE
Operating the engine without an air filter or with a
damaged or worn air filter will allow dirt to enter the
engine, causing rapid engine wear.
2. Oil Dipstick — Remove to check the amount and
condition of oil in the crankcase.
3. Oil Filler Cap — Remove to add the recommended
type of oil listed in Table 4. Make sure the cap is
tightened securely. DO NOT overfill.
4. Fuel Pump — Draws fuel from the fuel tank into the
engine.
5. Spark Plug — Provides spark to the ignition system.
Set the spark plug gap to 0.030 in. (0.76 mm). Clean
the spark plug once a week.
6. Electric Starter — Starts the engine when the ignition
key is rotated to the ON position.
7. Oil Drain Plug — Remove to drain oil from the
crankcase.
11
2
12
4
14
8. Ignition Switch/Keys — Insert the ignition key here
to start the engine. Turn the key clockwise to the ON
position, then continue turning clockwise to the START
position and release when the engine starts. To stop
the engine, turn the key fully counterclockwise to the
STOP position.
9. Recoil Starter — Manual starting mechanism. Pull
the starter grip slowly until resistance is felt, then pull
briskly and smoothly to start the engine.
10. Throttle Lever — Adjusts engine speed (RPM). Place
the lever in the UP (rabbit) position for FAST speed.
Place the lever in the DOWN (turtle) position for SLOW
speed.
11. Fuel Tank — Holds up to 12.0 quarts (11.4 liters) of
unleaded gasoline. Refer to the manufacturer’s engine
manual for additional information.
12. Fuel Filler Cap — Remove to add unleaded gasoline to
the fuel tank. Make sure the cap is tightened securely.
DO NOT overfill.
13. Choke Lever — Used in the starting of a cold engine,
or in cold weather conditions. The choke enriches the
fuel mixture.
14. Oil Filter — Prevents dirt and other debris from entering
the engine. Service the oil filter as recommended in the
maintenance section of this manual.
13
3
5
PAGE 16 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 17
DRUM SIDE
PADDLE BLADE ADJUSTMENT
STEEL DRUM
DRUM END
PADDLE BLADE
IS TOO TIGHT
AGAINST DRUM
SIDE WALLS
CORRECT
SIDE PADDLE BLADE
ROTATION
INCORRECT
CAST PADDLE
PADDLE BLADE
IS TOO TIGHT
AGAINST DRUM
SIDE WALLS
INCORRECT
CORRECT
ROTATION
END PADDLE BLADE
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 17
Figure 4. Paddle Blade Adjustment
Page 18
INSPECTION
BEFORE STARTING
1. Read the safety instructions at the
beginning of this manual.
2. Clean the mixer, removing dirt and
dust—particularly the engine cooling
air inlet, carburetor, and air cleaner.
3. Check the air filter for dirt and dust. If the air filter is
dirty, replace it with a new one as required.
4. Check the carburetor for external dirt and dust. Clean
with dry compressed air.
5. Check fastening nuts and bolts for tightness.
HARDWARE
Check all hardware on the mixer before starting. Periodically
inspect all hardware. Loose hardware can contribute to
early component failure and poor performance. Keep all
mixer hardware components tight.
ENGINE OIL
3. Reinsert the dipstick back into its holder, then remove
it again. Check the oil level (Figure 6) shown on the
dipstick.
ADD
OIL
ADD
Figure 6. Engine Oil Level
FULL
LIMIT
4. If the oil level is low, remove the oil filler cap
(Figure 7) and fill to the edge of the oil filler hole with
the recommended oil type listed in Table 4. DO NOT
overfill. Maximum oil capacity is 48 oz. (1.4 liters).
1. Place the mixer on secure, level ground with the engine
stopped.
2. Remove the engine oil dipstick (Figure 5) from the
engine and wipe it clean.
ENGINE OIL
DIPSTICK
Figure 5. Engine Oil Dipstick
OIL FILLER
CAP
Figure 7. Oil Filler Cap
Table 4. Oil Type
Season Temperature Oil Type
Summer 25°C or higher SAE 10W-30
Spring/Fall 25°C–10°C SAE 10W-30/20
Winter 0°C or lower SAE 10W-10
PAGE 18 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 19
INSPECTION
FUEL
DANGER
Motor fuels are highly flammable
and can be dangerous if mishandled.
DO NOT smoke while refueling. DO NOT
attempt to refuel the pump if the engine is
hot or running.
1. Remove the fuel filler cap (Figure 8) located on top of
the fuel tank.
FUEL
FILLER CAP
Figure 8. Fuel Inspection
EMERGENCY STOP SWITCH
The engine emergency stop switch (Figure 9) should be
tested every time the engine is started.
EMERGENCY
STOP SWITCH
Figure 9. Emergency Stop Switch
CAUTION
NEVER disable or disconnect the emergency stop
switch. It is provided for operator safety. Injury may result
if it is disabled, disconnected or improperly maintained.
2. Visually inspect the fuel level inside the fuel tank. If
fuel is low, replenish with unleaded gasoline. Be sure
to use a strainer for filtration while refueling.
DANGER
DO NOT top off fuel. Wipe up any spilled fuel
immediately.
HYDRAULIC OIL
Check the hydraulic oil sight gauge (Figure 10) to ensure
that the hydraulic oil is at the midway level.
HYDRAULIC OIL
SIGHT GAUGE
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 19
Figure 10. Hydraulic Oil Sight Gauge
Page 20
INSPECTION
FITTING CAP
ZERK GREASE
HYDRAULIC HOSES
Check hydraulic hoses to make sure they are not worn,
frayed or defective.
GREASE FITTINGS (SHAFT SEALS)
Check the Zerk grease fittings (Figure 11) at each end
of the mixing drum. These grease fittings lubricate the
paddle shaft seals. Grease daily with lithium-based EP
grease, preferably at the end of the day. Grease until visible
inside the drum to ensure that the cavity area is free of
contamination.
ZERK GREASE
FITTING
PILLOW BLOCK
BEARING
GREASE FITTINGS (PILLOW BLOCK BEARINGS)
Check the Zerk grease fittings underneath each of the pillow
block bearings (Figure 11). Grease daily with two shots of
lithium-based EP grease.
GREASE FITTINGS (DUMP CYLINDERS)
Check the Zerk grease fittings on each of the dump
cylinders (Figure 12). These grease fittings lubricate the
hydraulic dumping mechanism. Grease with one shot of
lithium-based EP grease every week.
FITTING
ZERK
FITTING CAP
DUMP CYLINDER
ZERK GREASE
FITTING
Figure 11. Grease Fittings (Bearings and Seals)
ZERK
Figure 12. Grease Fittings (Dump Cylinders)
ZERK GREASE
FITTING
PAGE 20 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 21
OPERATION
STARTING THE ENGINE
CAUTION
DO NOT attempt to operate the
mixer until the Safety Information,
General Information, and Inspection
sections of this manual have been
read and thoroughly understood.
This section is intended to assist the operator with the
initial start-up of the mixer. It is extremely important that
this section be read carefully before attempting to use the
mixer in the field.
Electric Start Method
1. Make sure the hydraulic paddle control lever (Figure 13)
is in the neutral position.
NEUTRAL
MIX
2. Pull the choke lever (Figure 14) outward to the CHOKE
or START position.
CHOKE
LEVER
Figure 14. Choke Lever (START)
3. Move the throttle lever (Figure 15) to the midway point
between the FAST and SLOW position.
REVERSE
HYDRAULIC
PADDLE
CONTROL LEVER
Figure 13. Hydraulic Paddle Control Lever
(Neutral Position)
FAST
SLOW
Figure 15. Throttle Lever (Midway Position)
4. Locate the emergency stop switch (Figure 16) on the
engine cover. Pull the switch outward to the START
position.
EMERGENCY
STOP SWITCH
PULL OUT
TO START
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 21
Figure 16. Emergency Stop Switch
(START Position)
Page 22
OPERATION
5. Insert the engine ignition key (Figure 17) into the
ignition switch. Turn the ignition key to the START
position and hold it until the engine starts. Release
the key when the engine starts, allowing it to return to
the ON position.
S
T
A
R
T
Figure 17. Ignition Key (START)
6. Allow the engine to warm up. If the weather is warm,
slowly move the choke lever to the RUN or OFF
position.
7. Run the engine for several minutes. Check for fuel
leaks and noises that could be associated with a loose
component.
3. Allow the engine to warm up. If the weather is warm,
slowly move the choke lever to the RUN or OFF
position.
4. Run the engine for several minutes. Check for fuel
leaks and noises that could be associated with a loose
component.
5. To begin mixing, place the throttle lever in the FAST
(rabbit) position.
MIXING
1. Push the hydraulic paddle control lever (Figure 19)
forward for clockwise mixing rotation of the paddle blades.
PUSH
NEUTRAL
REVERSE
HYDRAULIC
PADDLE
CONTROL LEVER
TO MIX
8. To begin mixing, place the throttle lever in the FAST
(rabbit) position.
Manual (Recoil) Start Method
1. Follow steps 1 through 4 of the Electric Start Method
procedure.
2. Slowly pull the recoil starter grip (Figure 18) until
resistance is felt, then pull briskly and smoothly to
start the engine. Gently return the starter grip to its
original position.
STARTER
GRIP
Figure 19. Hydraulic Paddle Control Lever
(Mix Position)
2. The paddle shaft inside the drum should be rotating
at this time.
3. Add a small amount of water to the mixing drum.
4. Lift the mixing bag compound onto the steel safety
grate over the bag cutter and let the contents fall
into the drum. Add more water if desired and mix the
compound to the desired consistency.
Figure 18. Recoil Starter Grip
PAGE 22 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 23
OPERATION
DUMPING
1. Push the hydraulic dump lever (Figure 20) forward to
place the drum in the dump position (Figure 21).
PUSH
TO DUMP
PULL TO
RETURN
HYDRAULIC
DUMP LEVER
Figure 20. Hydraulic Dump Lever
WARNING
When rotating the mixing drum from the dump position to
the upright position, keep hands clear of the safety grate.
The possibility exists of hands or fingers being crushed.
STOPPING THE ENGINE
WARNING
NEVER use the choke lever to stop the engine. Backfire,
fire, or engine damage could occur.
Figure 21. Mixer Drum (Dump Position)
2. Pull the hydraulic dump lever backward to return the
drum to the upright position.
Normal Shutdown
1. Place the hydraulic paddle control lever in the neutral
position to stop rotation of the paddle blades.
2. Place the throttle lever in the SLOW (turtle) position
and run the engine for three minutes at low speed.
FAST
SLOW
Figure 22. Throttle Lever (SLOW)
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 23
Page 24
3. After the engine cools, turn the ignition key to the OFF
position (Figure 23). Remove the ignition key and store
it in a safe location.
OFF
Figure 23. Ignition Key (OFF)
Emergency Shutdown
OPERATION
Push the emergency stop switch inward to the STOP
position.
EMERGENCY
STOP SWITCH
PUSH IN
TO STOP
Figure 24. Emergency Stop Switch
(STOP Position)
PAGE 24 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 25
Schedule engine maintenance procedures as indicated in Table 5.
Table 5. Engine Maintenance Schedule
MAINTENANCE
Description
(3)
Operation
Before
Each Use
First Month
or 25 Hours
Every
40 Hours
Every 6
Months or
100 Hours
Every Year
or 300
Hours
Every 2
Years or
500 Hours
Check X
Engine Oil
Change X X
Engine Oil Filter Replace Every 100 hours
Check X
Air Cleaner
Clean X (1)
Replace X X (*)
Check/Adjust X
Spark Plugs
Replace X
Cooling Fins Clean X
* Replace the paper filter element only.
(1) Service more frequently when used in dusty areas.
(2) These items should be serviced by your service dealer, unless you have the proper tools and are mechanically proficient. Refer to the
Briggs & Stratton service manual for service procedures.
(3) For commercial use, log hours of operation to determine proper maintenance intervals.
NOTICE
Refer to the engine manufacturer’s manual for specific
servicing instructions.
Table 6. Mixer Maintenance Schedule
Description Operation Daily Weekly
Bearings Grease X
Shaft Seals Grease X
Cylinder Pivot Grease X
Inspect X
Hydraulic Oil
Replace X
Every
500 Hours
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 25
Page 26
MAINTENANCE
Perform engine maintenance as indicated below:
Daily
1. Thoroughly remove dirt and oil from the engine and
control area.
2. Clean or replace the air cleaner elements as necessary.
3. Check and retighten all fasteners as necessary.
Weekly
1. Remove the fuel tank cap and clean the inside of the
fuel tank.
2. Remove and clean the spark plug (Figure 25). Adjust
the spark plug gap to 0.03 inch (0.76 mm). Replace the
spark plug if the electrode is burned or worn.
ENGINE OIL
NOTICE
Always drain the engine oil while the oil is warm.
1. Remove the oil drain plug and sealing washer
(Figure 26) and allow the oil to drain into a suitable
container.
DRAIN
PLUG
SEALING
WASHER
GAP: 0.03 in.
0.76 mm
Figure 25. Spark Plug
Figure 26. Draining Engine Oil
2. Reinstall the oil drain plug with sealing washer and
tighten securely.
3. Replace engine oil with the recommended oil type
listed in Table 4. Engine oil capacity is approximately
1.5 quarts (1.4 liters). DO NOT overfill.
PAGE 26 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 27
MAINTENANCE
ENGINE AIR CLEANER
1. Remove the air cleaner cover and air cleaner assembly
(cartridge and foam precleaner) as shown in Figure 27.
KNOB
COVER
NUT
PLATE
CARTRIDGE
BASE
HYDRAULIC OIL FILTER
Replace the hydraulic oil filter (Figure 28) every 500 hours.
Hydraulic tank capacity is 12 gallons (45 liters). Refill with
Shell Tellus 46 hydraulic oil or equivalent.
Figure 28. Hydraulic Oil Filter
MIXER CLEANING
FOAM
PRECLEANER
Figure 27. Engine Air Cleaner Assembly
2. Lightly tap the air cleaner cartridge (Figure 27) several
times on a hard surface to remove dirt. NEVER brush
off dirt. Brushing will force dirt into the fibers. Replace
the cartridge if it is excessively dirty.
NOTICE
DO NOT use solvents or pressurized air to clean the
cartridge. Pressurized air can damage the cartridge,
and solvents will dissolve the cartridge.
3. Clean the foam precleaner (Figure 27) in liquid
detergent and water. Rinse and squeeze dry thoroughly.
4. Reinstall the air cleaner assembly firmly into the air
cleaner base (Figure 27). Reinstall the cover and
tighten the knobs securely.
NOTICE
It is important that the drum interior is kept free of dried
material. Obstructions can cause the paddle blades to
lock against the drum.
1. Stop the engine. Follow the normal shutdown
procedure in the Maintenance section.
2. Place the hydraulic paddle lever in the neutral position
to disengage.
3. ALWAYS disconnect the spark plug wire before
cleaning the inside of the drum.
4. Place a Do Not Operate tag on the mixer.
5. Make sure the rear section of the safety grate is
connected to the mixing drum.
6. At the end of each day’s operation, place the mixer
drum in an upright position and spray the inside of the
tub immediately with water. This will prevent lumps of
dried mortar or plaster from forming and contaminating
future batches. DO NOT allow a buildup of materials
to form on the blades or anywhere inside the drum.
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 27
7. Rotate the mixer drum to the dump position and remove
debris.
Page 28
8. Thoroughly clean the entire mixer, cabinet and frame.
NOTICE
NEVER pour or spray water over the engine (Figure 29).
Figure 29. No Spraying of Water
MAINTENANCE
9. When cleaning of the entire mixer is complete, return
the mixing drum to the upright position.
LONG-TERM STORAGE
For storage of the mixer for over 30 days, the following is
recommended:
1. Drain the fuel tank completely, or add STA-BIL® to the
fuel.
2. Run the engine until the fuel is completely consumed.
3. Completely drain used oil from the engine crankcase
and fill with fresh, clean oil, then follow the procedures
described in the engine manual for engine storage.
4. Clean the entire mixer and engine compartment.
5. Place the mixing drum in the inverted position (mouth
facing downward).
6. Cover the mixer and place it in a clean, dry area that
is protected from harsh elements.
PAGE 28 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 29
TROUBLESHOOTING (ENGINE)
Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a
breakdown, please take remedial action following the diagnosis based on the troubleshooting tables. If the problem cannot
be remedied, please leave the unit as is and consult our company’s service department.
Troubleshooting (Engine)
Symptom Possible Problem Solution
Spark plug bridging? Check gap, insulation or replace spark plug.
Carbon deposit on spark plug? Clean or replace spark plug.
Diffi cult to start, fuel is available, but no spark at
spark plug.
Diffi cult to start, fuel is available, and spark is
present at the spark plug.
Diffi cult to start, fuel is available, spark is
present and compression is normal.
Diffi cult to start, fuel is available, spark is
present and compression is low.
No fuel present at carburetor.
Short circuit due to defi cient spark plug
insulation?
Improper spark plug gap? Set to proper gap.
Spark plug is red? Check transistor ignition unit.
Spark plug is bluish white?
No spark present at tip of spark plug?
No oil? Add oil as required.
Oil pressure alarm lamp blinks upon starting? (if
applicable)
ON/OFF switch is shorted? Check switch wiring, replace switch.
Ignition coil defective? Replace ignition coil.
Improper spark gap, points dirty? Set correct spark gap and clean points.
Condenser insulation worn or short circuiting? Replace condenser.
Spark plug wire broken or short circuiting? Replace defective spark plug wiring.
Wrong fuel type?
Water or dust in fuel system? Flush fuel system.
Air cleaner dirty? Clean or replace air cleaner.
Choke open? Close choke.
Suction/exhaust valve stuck or protruded? Reseat valves.
Piston ring and/or cylinder worn? Replace piston rings and/or piston.
Cylinder head and/or spark plug not tightened
properly?
Head gasket and/or spark plug gasket damaged? Replace head and spark plug gaskets.
No fuel in fuel tank? Fill with correct type of fuel.
Fuel cock does not open properly?
Fuel fi lter/lines clogged? Replace fuel fi lter.
Fuel tank cap breather hole clogged? Clean or replace fuel tank cap.
Air in fuel line? Bleed fuel line.
Check spark plug insulation, replace if worn.
If insuffi cient compression, repair or replace
engine. If injected air leaking, correct leak. If
carburetor jets clogged, clean carburetor.
Check if transistor ignition unit is broken, and
replace defective unit. Check if voltage cord
cracked or broken and replace. Check if spark
plug if fouled and replace.
Check automatic shutdown circuit, "oil sensor".
(if applicable)
Flush fuel system, replace with correct type of
fuel.
Torque cylinder head bolts and spark plug.
Apply lubricant to loosen fuel cock lever,
replace if necessary.
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 29
Page 30
Symptom Possible Problem Solution
Weak in power, compression is proper and
does not misfi re.
Weak in power, compression is proper but
misfi res.
Engine overheats
Rotational speed fl uctuates.
Recoil starter malfunctions. (if applicable)
Starter malfunctions.
Burns too much fuel.
Exhaust color is continuously "white".
Exhaust color is continuously "black".
Will not start, no power with key "ON". (if
applicable)
TROUBLESHOOTING (ENGINE)
Troubleshooting (Engine) - continued
Air cleaner dirty? Clean or replace air cleaner.
Improper level in carburetor? Check fl oat adjustment, rebuild carburetor.
Defective spark plug? Clean or replace spark plug.
Improper spark plug? Set to proper gap.
Water in fuel system?
Dirty spark plug? Clean or replace spark plug.
Ignition coil defective? Replace ignition coil.
Wrong type of fuel? Replace with correct type of fuel.
Cooling fi ns dirty? Clean cooling fi ns.
Intake air restricted?
Oil level too low or too high? Adjust oil to proper level.
Governor adjusted incorrectly? Adjust governor.
Governor spring defective? Replace governor spring.
Fuel fl ow restricted? Check entire fuel system for leaks or clogs.
Recoil mechanism clogged with dust and dirt? Clean recoil assembly with soap and water.
Spiral spring loose? Replace spiral spring.
Loose, damaged wiring?
Battery insuffi ciently charged? Recharge or replace battery.
Starter damaged or internally shorted? Replace starter.
Over-accumulation of exhaust products?
Wrong spark plug?
Lubricating oil is wrong viscosity? Replace lubricating oil with correct viscosity.
Worn rings? Replace rings.
Air cleaner clogged? Clean or replace air cleaner.
Choke valve set to incorrect position? Adjust choke valve to correct position.
Carburetor defective, seal on carburetor
broken?
Poor carburetor adjustment, engine runs too
rich?
ON/OFF device not activated ON? Turn on ON/OFF device.
Battery disconnected or discharged?
Ignition switch/wiring defective? Replace ignition switch. Check wiring.
Flush fuel system and replace with correct
type of fuel.
Clear intake of dirt and debris. Replace air
cleaner elements as necessary.
Ensure tight, clean connections on battery
and starter.
Check and clean valves. Check muffl er and
replace if necessary.
Replace spark plug with manufacturer's
suggested type.
Replace carburetor or seal.
Adjust carburetor.
Check cable connections. Charge or replace
battery
PAGE 30 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 31
TROUBLESHOOTING (MIXER)
Troubleshooting (Mixer)
Symptom Possible Problem Solution
Contaminated relief cartridge? Inspect relief pressure (2,300 psi).
Material load too heavy, exceeding
mixer capability?
Blades will not rotate.
Object stuck inside mixing drum,
jamming paddle rotation?
Improper engine speed? Check and adjust engine speed.
Material leaking from drum ends. Worn or defective paddle shaft seals? Replace seals.
Reduce amount of material being
mixed.
Stop engine. Empty out drum
contents. Remove obstruction.
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 31
Page 32
K
HYDRAULIC SYSTEM LOCATOR
H
G
B
C
M
N
A
J
E
D
L
F
PAGE 32 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 33
HYDRAULIC SYSTEM DIAGRAM
RETURN
FILTER
D
TANK
HYDRAULIC
DUMP
FORWARD/
REVERSE
G H
F
GEAR
PUMP
M
ENGINE
N
RELIEF
VALV E
2,300 PSI
SUCTION
STRAINER
C
BYPASS
E
25 PSI
B
2
1
RELIEF
VALV E
2,300 PSI
HYD
MOTOR
A
TANK
J
K
CYLINDER
L
CYLINDER
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 33
Page 34
HYDRAULIC
FILTER
HYDRAULIC HOSE CONNECTIONS
HYDRAULIC
MOTOR
HYDRAULIC
VALVE
HOSE COLORS SHOWN
FOR CLARITY ONLY
HYDRAULIC
PUMP
HYDRAULIC
DUMP CYLINDER
HYDRAULIC
DUMP CYLINDER
PAGE 34 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
Page 35
NOTES
PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19) — PAGE 35
Page 36
OPERATION MANUAL
HERE’S HOW TO GET HELP
© COPYRIGHT 2019, MULTIQUIP INC.
Multiquip Inc
the MQ logo are registered trademarks of Multiquip Inc. and may not be used, reproduced, or altered without written permission. All other trademarks are the property
of their respective owners and used with permission.
This manual
The information and specifi cations included in this publication were in effect at the time of approval for printing. Illustrations, descriptions, references and technical data contained in
this manual are for guidance only and may not be considered as binding. Multiquip Inc. reserves the right to discontinue or change specifi cations, design or the information published
in this publication at any time without notice and without incurring any obligations.
PLEASE HAVE THE MODEL AND SERIAL
NUMBER ON-HAND WHEN CALLING
UNITED STATES
Multiquip Corporate Offi ce MQ Parts Department
18910 Wilmington Ave.
Carson, CA 90746
Contact : mq@multiquip.com
Service Department Warranty Department
(800) 421-1244
(310) 537-3700
Technical Assistance
(800) 478-1244 Fax: (310) 943-2238
CANADA
Multiquip Multiquip (UK) Limited Head Offi ce
4110 Industriel Boul.
Laval, Quebec, Canada H7L 6V3
Contact : infocanada@multiquip.com
Tel. (800) 421-1244
Fax (310) 537-3927
Tel: (450) 625-2244
Tel: (877) 963-4411
Fax: (450) 625-8664
(800) 427-1244
(310) 537-3700
(800) 421-1244
(310) 537-3700
UNITED KINGDOM
Unit 2, Northpoint Industrial Estate,
Globe Lane,
Dukinfi eld, Cheshire SK16 4UJ
Contact : sales@multiquip.co.uk
Fax: (800) 672-7877
Fax: (310) 943-2249
Tel: 0161 339 2223
Fax: 0161 339 3226
,
MUST accompany the equipment at all times. This manual is considered a permanent part of the equipment and should remain with the unit if resold.
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