OPERATION AND PARTS MANUAL
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MODEL BPX
GASOLINE BACKPACK VIBRATOR
(HONDA GXH50UQXA GASOLINE ENGINE)
Revision #1 (08/28/17)
To find the latest revision of this
publication, visit our website at:
www.multiquip.com
THIS MANUAL MUST ACCOMPANY THE EQUIPMENT AT ALL TIMES.
PN: 14454
PROPOSITION 65 WARNING
Engine exhaust and some of
its constituents, and some dust created
of California to cause cancer, birth
defects and other reproductive harm.
by power sanding, sawing, grinding,
drillingandotherconstructionactivities
contains chemicals known to the State
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.
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PAGE 2 — BPX GASOLINE VIBRATOR • OPERATION AND PARTS MANUAL — REV. #1 (08/28/17)
SILICOSIS/RESPIRATORY WARNINGS
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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.
BPX GASOLINE VIBRATOR • OPERATION AND PARTS MANUAL — REV. #1 (08/28/17) — 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.
TABLE OF CONTENTS
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Multiquip Bpx
Gasoline Concrete Vibrator
Proposition 65 Warning ........................................... 2
Silicosis/Respiratory Warnings
Table Of Contents
Parts Ordering Procedures
Safety Information
Specifications
Dimensions
General Information
Components
Set-Up
Inspection
Operation
Maintenance
Troubleshooting
Explanation Of Code In Remarks Column............. 30
Suggested Spare Parts
............................................................. 15–17
.............................................................. 18
......................................................... 19–24
.................................................... 4
............................................... 6–9
........................................................ 10
............................................................ 11
............................................... 12
.................................................... 13–14
.................................................... 25–28
..................................................... 29
......................................... 31
................................ 3
...................................... 5
Component Drawings
Nameplate And Decals Assembly. ................... 32–33
Vibrator Assembly.
Frame And Swivel Assembly
Engine Mounting Assembly
Engine Service Parts Assembly.
Terms And Conditions Of Sale — Parts
NOTICE
Specifications and part numbers are subject to change
without notice.
........................................... 34–35
.......................... 36–37
............................ 38–39
...................... 40–41
................ 42
PAGE 4 — BPX GASOLINE VIBRATOR • OPERATION AND PARTS MANUAL — REV. #1 (08/28/17)
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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.
This operation manual has been developed
to provide complete instructions for the safe and
effi cient operation of the Multiquip Model BPX Gasoline
Backpack Vibrator. Refer to the engine manufacturer's
instructions for data relative to its safe operation.
Before using this vibrator, ensure that
the operating individual has read and
understood all instructions in this manual.
This vibrator, other property, or the surrounding environment
could be damaged if you do not follow instructions.
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
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DANGER
Indicates a hazardous situation which, if not avoided,
WILL result in DEATH or SERIOUS INJURY.
or NOTICE.
safety messages.
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.
NOTICE
Addresses practices not related to personal injury.
PAGE 6 — BPX GASOLINE VIBRATOR • OPERATION AND PARTS MANUAL — REV. #1 (08/28/17)
SAFETY INFORMATION
GENERAL SAFETY
NEVER use accessories or attachments that are not
recommended by Multiquip for this equipment. Damage
Also, know the
and
This information will be invaluable in
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
operate equipment with covers or guards
away
from all moving parts to prevent injury. Wear clothing that
will not likely become caught in the equipment or snag
be sure the operator is familiar with proper
safety precautions and operating techniques before
leave the vibrator unattended. Turn off engine
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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.
NEVER operate this equipment when not
feeling well due to fatigue, illness or when
under medication.
NEVER operate this equipment under the infl uence of
drugs or alcohol.
ALWAYS check the equipment for loosened threads or
bolts before starting.
NEVER operate vibrator around corrosive chemicals or
water containing toxic substances. These fl uids could
create serious health and environmental hazards.
Contact local authorities for assistance.
DO NOT use the equipment for any purpose other than
its intended purposes or applications.
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 keep a phone on the job site.
phone numbers of the nearest ambulance, doctor
fi re department.
the case of an emergency.
VIBRATOR SAFETY
NEVER operate the equipment in an explosive
DANGER
atmosphere, near combustible materials, or
near fl ammable or low fl ash point fl uids. An
explosion or fi re could result causing severe
bodily harm or even death.
WARNING
NEVER disconnect any
NOTICE
This equipment should only be operated by trained and
qualifi ed personnel 18 years of age and older.
This equipment is for industrial use only.
Whenever necessary, replace nameplate, operation and
safety decals when they become diffi cult to read.
Manufacturer does not assume responsibility for any
accident due to equipment modifi cations. Unauthorized
equipment modifi cation will void all warranties. Any
modifi cation which could lead to a change in the original
characteristics of the machine should be made only by
the manufacturer who shall confi rm that the machine is
in conformity with appropriate safety regulations.
BPX GASOLINE VIBRATOR • OPERATION AND PARTS MANUAL — REV. #1 (08/28/17) — PAGE 7
devices will void all warranties.
NEVER
removed. Keep fi ngers, hands, hair, and clothing
on the forms.
CAUTION
ALWAYS
using vibrator.
NEVER
when unattended.
SAFETY INFORMATION
NEVER lubricate components or attempt service on a
ENGINE SAFETY
ALWAYS place the engine ON/OFF switch in the OFF
for engine
run engine without an air fi lter or with a dirty air
fi lter. Severe engine damage may occur. Service air fi lter
State Health Safety Codes and Public Resources
Codes specify that in certain locations, spark arresters
must be used on internal combustion engines that use
hydrocarbon fuels. A spark arrester is a device designed
to prevent accidental discharge of sparks or fl ames
from the engine exhaust. Spark arresters are qualifi ed
and rated by the United States Forest Service for this
purpose. In order to comply with local laws regarding
spark arresters, consult the engine distributor or the
add fuel to equipment if it is placed inside truck
bed with plastic liner. Possibility exists of explosion or fi re
start the engine near spilled fuel or combustible
fl uids. Gasoline fuel is extremely fl ammable and its
refuel in a well-ventilated area, away from
use extreme caution when working with
fi ll the fuel tank while the engine is running
overfi ll tank, since spilled fuel could ignite if it
comes into contact with hot engine parts or sparks from
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running machine.
ALWAYS allow the vibrator a proper amount of time to
cool before servicing.
NOTICE
ALWAYS keep the machine in proper running condition.
ALWAYS become familiar with the components of the
vibrator before operating.
Fix damage to 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.
DANGER
The engine fuel exhaust gases contain poisonous carbon
monoxide. This gas is colorless and odorless, and can
cause death if inhaled.
The engine of this equipment
requires an adequate free
fl ow of cooling air. NEVER
operate this equipment 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. Remember
the engine gives off DEADLY gases.
WARNING
NEVER operate the engine with heat shields or
guards removed.
DO NOT remove the engine oil drain plug while
the engine is hot. Hot oil will gush out of the engine
crankcase and severely scald any persons in the general
area of the vibrator.
CAUTION
position when the vibrator is not in use.
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.
NOTICE
Refer to the Engine Owner's Manual
technical questions or information.
NEVER
frequently to prevent engine malfunction.
local Health and Safety Administrator.
FUEL SAFETY
DANGER
DO NOT
due to static electricity.
DO NOT
vapors can cause an explosion if ignited.
ALWAYS
sparks and open fl ames.
ALWAYS
fl ammable liquids.
DO NOT
or hot.
NEVER touch the hot exhaust manifold,
muffl er or cylinder. Allow these parts to cool
before servicing equipment.
PAGE 8 — BPX GASOLINE VIBRATOR • OPERATION AND PARTS MANUAL — REV. #1 (08/28/17)
DO NOT
the ignition system.
SAFETY INFORMATION
Store fuel in appropriate containers, in well-ventilated
TRANSPORTING
ENVIRONMENTAL SAFETY/
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 rules below.
DO NOT pour waste or oil directly onto the ground, down
When the life cycle of this equipment is over, remove
battery (if equipped) and bring to appropriate facility for
lead reclamation. Use safety precautions when handling
When the life cycle of this equipment is over, it is
recommended that the unit frame and all other metal
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
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
Attempting 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
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areas and away from sparks and fl ames.
NEVER use fuel as a cleaning agent.
DO NOT smoke around or near the
equipment. Fire or explosion could result
from fuel vapors or if fuel is spilled on a
hot engine.
ALWAYS shut down engine before transporting.
Tighten fuel cap securely and close fuel cock to prevent
fuel from spilling.
ALWAYS use proper lifting techniques when using or
moving the vibrator (backpack), fl exible shaft, or vibrator
assembly.
DECOMMISSIONING
NOTICE
a drain or into any water source.
Contact your country's Department of
Public Works or recycling agency in your
area and arrange for proper disposal of
any electrical components, waste or oil
associated with this equipment.
batteries that contain sulfuric acid.
parts be sent to a recycling center.
promotes energy cost savings.
EMISSIONS INFORMATION
ALWAYS observe all applicable compulsory regulations
relevant to environmental protection, especially fuel
storage, the handling of hazardous substances, and the
wearing of protective clothing and equipment. Instruct
the user as necessary, or, as the user, request this
information and training.
Dispose of hazardous waste properly. Examples of
potentially hazardous waste include used motor oil, fuel,
and fuel fi lters.
DO NOT use food or plastic containers to dispose of
hazardous waste.
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.
BPX GASOLINE VIBRATOR • OPERATION AND PARTS MANUAL — REV. #1 (08/28/17) — PAGE 9
your authorized Honda Engine Distributor.
Table 1. Honda Engine Specifications
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Model Honda GXH50UQXA
Type
Bore × Stroke
Displacement
Max. Output
Fuel Tank Capacity
Engine
Dimension
(L x W x H)
Dry Net Weight (Engine)
Operating Weight (Vibrator/Backpack)
Fuel
Lube Oil Capacity
Spark Plug Type
Spark Plug Gap
Speed Control Method
Starting Method
SPECIFICATIONS
4-Stroke, Single Cylinder, OHV, Gasoline Engine
1.65 in. × 1.42 in.
(42 mm × 36 mm)
3.0 in3 (49 cm3)
2.5 hp/7,000 rpm
Approx. 0.32 U.S. gallons (1.2 liters)
Unleaded Gasoline Octane Rating of 86 or Higher
0.26 qt. (.25 liters)
NKG: CR5HSB
Denso: U16FSR-UB
0.024 – 0.028 in.
(0.6 – 0.7 mm)
Centrifugal Flyweight Type
Recoil Start
8.9
× 10.8 × 13.9 in.
(225 × 274 × 353 mm)
12.1 lb. (5.5 kg)
31 lb. (14.1 kg)
PAGE 10 — BPX GASOLINE VIBRATOR • OPERATION AND PARTS MANUAL — REV. #1 (08/28/17)
BPX
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DIMENSIONS
C
A
B
Figure 1. Vibrator Dimensions
Table 2. Vibrator Dimensions
Reference
Letter
A 11.0 (280)
B 13.75 (349)
C 27.0 (686)
Dimension in. (mm)
BPX GASOLINE VIBRATOR • OPERATION AND PARTS MANUAL — REV. #1 (08/28/17) — PAGE 11
GENERAL INFORMATION
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GENERAL INFORMATION
The BPX backpack vibrator utilizes a Honda GXH50
2.5-hp, 4-stroke, overhead-valve, single-cylinder, gasoline
engine. The frame is mounted on three rubber isolators to
help reduce engine vibration. The vibrator comes standard
with a quick-disconnect coupling for easy removal of the
flexible shaft.
CAUTION
When operating the BPX vibrator, ALWAYS wear
rubber insulated gloves and boots. Safety glasses and
ear protection are also recommended.
Tips
Keep the bending radius of the flexible hose to a
minimum during use.
Avoid starting the unit with the vibrator head immersed in
the concrete mix. After the engine has started, immerse
the vibrator head into concrete mix.
Backpack Vibrator Theory
The purpose of this vibrator is to consolidate concrete by
removing air pockets and voids.
The vibrator is designed to set the particles in fresh concrete
in motion, thereby reducing friction and giving the mixture
a mobile quality so that gravity and the displacement of
entrapped air cause the concrete to settle easily into place.
By consolidating the concrete quickly, the vibrator allows
stiffer mixes to be poured than would otherwise be possible.
Vibration also makes concrete more watertight, increases
resistance to weathering, and creates a better bond
between concrete and reinforcement.
Because vibration causes much of the entrapped air in
concrete to rise to the surface, honeycombing is prevented.
Vibration also eliminates most air pockets between the
concrete and vertical forms.
Excessive wear to the vibrating head can result from
misuse. DO NOT allow the head to vibrate against already
hardened concrete or steel used for reinforcement.
NEVER drop or knock the vibrator head against any
hard objects. This can damage the eccentric end bell
assembly or bearings contained within the head.
ALWAYS rinse or wipe off any wet concrete before it dries
or hardens on any part of the unit (engine, shaft, or head).
WARNING
Before operating this gasolinepowered vibrator, the operator must
read and understand the contents of
the operation manual. Failure to read
this manual may result in severe bodily
harm and damage to the equipment.
PAGE 12 — BPX GASOLINE VIBRATOR • OPERATION AND PARTS MANUAL — REV. #1 (08/28/17)
COMPONENTS (VIBRATOR)
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1
10
12
7
6
Figure 2. Vibrator Components
11
8
2
9
4
3
5
1. Hard Hat — Always wear a hard hat for head protection.
2. Safety Glasses — Always wear safety glasses to
protect eyes from foreign matter and debris.
3. Rubber Gloves — Always wear rubber gloves to
protect hands from abrasive materials.
4. Flexible Shaft — The BPX can accommodate various
shaft lengths. See Table 3 and Table 4 for shaft length
dimensions.
5. Vibrating Head — The BPX can accommodate various
vibrating heads. See Table 5 for various head types.
Typical applications include large retaining walls, bridge
decks, and columns.
6. Rubber Boots — Always wear rubber boots to protect
feet from abrasive materials.
7. Belt Guard — Prevents access to the pulleys and
V-belt while the vibrator is running. DO NOT operate
the vibrator with this cover removed.
8. Quick Disconnect Fitting — Allows for the quick and
easy removal of the flexible shaft from the vibrator.
9. Throttle — Push up (rabbit) to increase engine speed,
and pull down (turtle) to decrease engine speed.
10. Engine — The BPX utilizes a Honda GXH50 2.5-hp,
4-stroke, overhead-valve, single-cylinder gasoline
engine.
11. Backpack Harness/Pad — The BPX is equipped
with an adjustable harness. Adjust the harness to a
comfortable fit so that it will not slip or fall. A back pad
has been added for operator comfort.
12. Frame — Made of a lightweight metal alloy, this frame
features an engine support platform with a swivel base
that can be rotated for better operator leverage over
the application. In addition, the frame has three rubber
shock mounts installed to help reduce engine vibration.
BPX GASOLINE VIBRATOR • OPERATION AND PARTS MANUAL — REV. #1 (08/28/17) — PAGE 13
COMPONENTS (ENGINE)
1
7
2
6
5
4
3
10
9
8
11
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Figure 3. Honda Engine Components
1. Choke Lever — Used in the starting of a cold engine,
or in cold weather conditions. The choke enriches the
fuel mixture.
2. Spark Plug — Provides spark to the ignition system.
Clean the spark plug once a week.
3. Recoil Starter — Manual starting mechanism. Slowly
pull the starter grip until resistance is felt, then pull
briskly and smoothly to start the engine.
4. Throttle Lever — Adjusts engine RPM speed.
5. Oil Drain Plug — Remove this plug to remove oil from
the engine’s crankcase.
6. Dipstick/Oil Filler Cap — Remove to determine
if engine oil is low. Add oil through this port as
recommended in Table 6.
7. Air Cleaner — Prevents dirt and other debris from
entering the fuel system. Press the latch tabs on top
of the air cleaner cover and remove the cover to gain
access to the filter elements.
NOTICE
Operating the engine without an air filter, or with a
damaged or worn air filter in need of replacement, will
allow dirt to enter the engine, causing rapid engine
wear.
PAGE 14 — BPX GASOLINE VIBRATOR • OPERATION AND PARTS MANUAL — REV. #1 (08/28/17)
8. Fuel Tank/Fuel Filler Cap — The fuel tank holds 0.32
gallons (1.2 liters) of unleaded gasoline. Remove the
fuel filler cap to add unleaded gasoline to the fuel tank.
Make sure the cap is tightened securely. DO NOT
overfill.
DANGER
DO NOT fill the fuel tank while the engine is running or
hot. In the event of a fuel spill, DO NOT start the engine
until all fuel residue has been wiped up and
the area surrounding the engine is dry. Fuel
is extremely flammable and can ignite if
it comes into contact with hot engine parts
or sparks from the ignition system.
9. Muffler — Reduces noise and emissions. NEVER
touch the muffler while it is hot.
WARNING
Engine components can generate
10. Engine ON/OFF Switch — ON position permits engine
starting, OFF position stops the engine.
11. Fuel Valve Lever — Open to allow the flow of fuel, and
close to prevent the flow of fuel.
extreme heat. To prevent burns,
DO NOT touch these areas while the
engine is running or immediately after
operating. NEVER operate the engine
with the muffler removed.
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