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.
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)
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.
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)
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
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)
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
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)
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
NOTES
PAGE 10 — PRO20 HYDRAULIC MIXER • OPERATION MANUAL — REV. #0 (04/17/19)
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
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