Bohmer-AG AG-178FD User manual

The product is NOT supplied with engine oil, although traces of oil from the manufacturing process may be present. It is
essential to add adequate engine oil of the correct type to the engine before use – see the Checking and Changing Engine
Oil section. Failure to add engine oil will void the product warranty.
READ THIS MANUAL CAREFULLY BEFORE USE – FAILURE TO DO SO MAY RESULT IN INJURY,
PROPERTY DAMAGE AND MAY VOID WARRANTY.
KEEP THIS MANUAL FOR FUTURE REFERENCE.
Products covered by this manual may vary in appearance, assembly, inclusions, specications,
description and packaging.
V3.1
Qualität Durch Forschung
AG-178-FD AG-192-FD
Diesel Engine

02 © Böhmer-AG 2020
AG-178FD / AG-192FD
Safety
Use the equipment and accessories etc. in
accordance with these instructions, taking
into account working conditions and the
work to be performed. Using the equipment
for operations different from those intended
could result in hazardous situations.
Before use, inspect the equipment for
misalignment or binding of moving parts,
loose components, damage or any other
condition that may affect its operation. If
damaged, have the equipment repaired by
an authorized service centre or technician
before use.
Always keep the equipment and accessories
(cutting tools, nozzles, bits etc) properly
maintained. Keep the equipment, controls
and handles dry and free from dirt, oil and
grease.
Store the equipment out of reach of children
or untrained persons. To avoid burns or re
hazards, let the equipment cool completely
before transporting or storing. Never place
the equipment in places where there are
ammable materials, combustible gases or
combustible liquids etc.
The equipment is not weatherproof, and
should not be stored in direct sunlight, at
high ambient temperatures or locations that
are damp or very humid.
General Work Safety
Work areas should be clean and well it.
Do not operate the equipment if bystanders,
animals etc are within operating range of
the equipment or the general work area.
Personal Safety
Keep packaging away from children - risk
of suffocation! Operators must use the
equipment correctly. When using the
equipment, consider conditions and pay due
care to persons and property.
Prevent unintentional starting of the
equipment - ensure equipment and power
source switches are in the OFF position
before connecting or moving the equipment.
Do not carry equipment with hands/ngers
touching any controls. Remove any tools
or other items that are not a part of the
equipment from it before starting or
switching on.
Stay alert and use common sense when
operating equipment. Do not overreach.
Keep proper footing and balance at all
times. Do not use equipment when tired
or under the inuence of drugs, alcohol or
medication. This equipment is not intended
for use by persons with reduced physical,
sensory or mental capabilities.
You must wear appropriate protective
equipment when operating, servicing, or
when in the operating area of the equipment
to help protect from serious injury, including
eye injury, inhalation of toxic fumes,
burns, and hearing loss. Always wear eye
protection. Protective equipment such as
respirators, non-skid safety shoes, hard hat,
hearing protection etc should be used for
appropriate conditions. Other people nearby
should also wear appropriate personal
protective equipment. Do not wear loose
clothing or jewellery, which can be caught in
moving parts. Keep hair and clothing away
from the equipment.
If devices are provided for the connection
of dust extraction and collection facilities,
ensure these are connected and properly
used. Use of dust collection can reduce
dust-related hazards.
General
Do not force the equipment. Use the correct
equipment for your application. The correct
equipment will perform better and be
safer within its design parameters. Do not
use the equipment if the ON/OFF switch
malfunctions – any equipment that cannot
be controlled with the ON/OFF switch is
dangerous and must be repaired.
It is important that you read and understand
the instruction manual before use and
keep the manual in a safe place for future
reference. Safety information presented
here is generic in nature – some advice
may not be applicable to every piece of
equipment.
All safety precautions must be observed
to reduce the risk of personal injury when
operating the equipment.
The term “equipment” refers to your
product, be it electrical mains, battery or
petrol engine powered.
IMPORTANT – Handle the equipment safely
and carefully.
BEFORE USE - If you are not familiar
with the safe operation/handling of this
equipment, or are in any way unsure of any
aspect of suitability or correct use it for your
application, you should complete training
conducted by a person or organization
qualied in safe use and operation of this
equipment, including fuel/electrical handling
and safety.
WARNINGS
• Read all safety warnings and all
instructions. Failure to follow
warnings and instructions may result
in electric shock, fire and/or serious
injury.
• Never run a petrol engine in confined
areas.
• Do not operate the equipment in
flammable or explosive environments,
such as in the presence of flammable
liquids, gases or dust. Engine and
equipment may create sparks or heat
that may ignite vapors, dust etc
• Keep clear of moving parts.
• This equipment may be a potential
• source of electric shock if misused.
• Do not operate the equipment if it is
damaged, malfunctioning or is in an
excessively worn state.
• Do not allow others to use the
equipment unless they have read this
manual and are adequately trained.
• When using the equipment, basic
safety precautions detailed here must
always be followed to reduce the risk
of fire, electric shock, personal injury
and material damage.
• When wiring electrically powered
equipment, follow all electrical and
safety codes.
• Ensure all power sources conform to
equipment voltage requirements and
are disconnected before connecting
equipment.
You Can be
INJURED if you do not
follow instructions or
equipment damage
may occur.
You CAN be KILLED or
SERIOUSLY INJURED if
you do not follow
instructions.
You WILL be KILLED or
SERIOUSLY INJURED
if you do not follow
instructions.

03
© Böhmer-AG 2020
AG-178FD / AG-192FD
General Fuel Safety
Petrol/fuel/gasoline is
extremely ammable - keep
clear of naked ames or other
ignition sources.
• Do not spill fuel. If you spill fuel, wipe
it from your equipment immediately.
If fuel gets on your clothing, change
them immediately.
• Do not smoke near fuel.
• Always shut off engine before
refuelling.
• Do not refuel a hot engine
• Open the fuel cap carefully to allow
any pressure build-up in the tank to
release slowly.
• Always refuel in well ventilated areas.
• Always check for fuel leakage. If fuel
leakage is found, do not start or run
the engine until all leaks are fixed.
General Service Information
• Have the equipment serviced or
repaired at authorized service centers
by qualified personnel only.
• Replacement parts must be original
equipment manufacturer (OEM) to
help ensure that equipment safety is
maintained.
• Do not attempt any maintenance
or repair work not described in this
instruction manual.
• After use, the equipment and
components may still be hot – allow
the equipment to cool and disconnect
spark plugs and/or electrical power
sources and/or batteries from it
before making adjustments, changing
accessories or performing repair or
maintenance.
• Do not make adjustments while the
equipment is running.
• Perform all service related activities
under suitable conditions, such as a
workshop etc.
• Replace any worn, damaged or
missing warning labels immediately.
• Do not clean equipment with solvents,
flammable liquids or harsh abrasives.
DANGER
Running combustion engines in conned
areas CAN KILL IN MINUTES. Engine exhaust
fumes contain carbon-monoxide – a deadly
gas that you cannot smell or see.
NEVER run a combustion engine in conned
areas EVEN IF windows and doors are open.
ONLY run petrol engines OUTDOORS and
away from doors, windows and vents.
Do not operate the equipment in hazardous
locations, such as where there may be a
risk of re or explosions from ammable
liquids, gases or dust.
Do not operate the equipment in conned
areas where exhaust gases, smoke or fumes
could reach dangerous concentrations.
Do not refuel a combustion engine while it is
running, on or hot.
Never smoke while refuelling combustion
engines or handling ammable substances.
For generators, the electrical output
is potentially lethal and must only be
connected to a xed electrical installation by
an appropriately licensed person.
Be aware that the equipment may include
hazardous components, such as blades, hot
surfaces and moving parts.
Handle any ammable substance with
extreme caution.

04 © Böhmer-AG 2020
AG-178FD / AG-192FD
Contents Languages
02 Safety
04 Table of Contents
05 Parts Identication
06 Assembly
07 Before Use Checklist
08 Before Use Checklist Continued
09 Mounting & Connecting to the Engine
10 Engine Starting and Operation
11 Engine Starting and Operation Continued
12 Maintenance
13 Checking and Changing Engine Oil
14 Checking and Changing Engine Oil Continued
15 Checking, Cleaning or Replacing the Air Filter
16 Transportation and Storage
17 Troubleshooting
18 Troubleshooting Continued
19 Specications
20 Service and Maintenance Record
22 - Français
43 - Deutsch
64 - Italiano
85 - Español

05
© Böhmer-AG 2020
AG-178FD / AG-192FD
Parts Identication
It is stongly recommended that you familiarise yourself with all major components of the machine before using it or performing any maintenance
tasks.
Products detailed in this manual may vary in appearance, inclusions, description and packaging from those shown or described. This
section shows typical major components common to most engines.
01
02
03
06
06
04
11
07
05
08
09
10
13
12
14 15
01. Exhaust
02. Fuel Tank (fuel filter on top)
03. Air Intake assembley (Filter inside)
04. Throttle
05. Fuel Tap
06. Oil Filter/Dipstick (Some models have 2)
07. Oil Drain Plug (Some models have 2)
08. Fuel ON/OFF Switch
09. Recoil Starter Cord
10. Electric Start Module (Electric Start
Models)
11. Starter Motor (Electric Start Models)
12. Output Shaft (Drive Key supplied)
13. Output Shaft Flange
14. Engine Mounting Holes (4)
15. De-compression Switch

06 © Böhmer-AG 2020
AG-178FD / AG-192FD
Assembly
If the electric start switch block has been supplied unassembled, it will require attachment to the engine and the wiring connected. Attach the
switch block (B) to the brackets on the engine using the 2 supplied bolts. The mounting brackets on the engine may vary slightly between models,
however, the switch block is always located next to the starter motor. Connect wires as follows:
No. Wire Colour Use
01 Green Ignition
02 Red Starter Motor Power
03 White Starter Motor Earth
Typically, most engines are fully assembled, however, some models may
require the following assembly (as applicable). The image below shows
an unassembled electric start model with exhaust shroud.
Electric Start
Exhaust Shroud
Place the shroud (A) over the exhaust port – generally with the opening
facing down, and attach it using the 4 supplied screws. A
01 0302
04
05
No. On Engine Use
04 Push Terminal Connect to ‘3’
05 Blue Wire Connect to ‘1’
06 Earth Terminal Connect to ‘2’
06

07
© Böhmer-AG 2020
AG-178FD / AG-192FD
Before Use Checklist
Ensure that you carry out all procedures below before starting the engine or operating the equipment. All procedures
described are generic in nature and slight variations between different models may exist. Failure to follow the checklist
and carry out the procedures correctly may result in making the product warranty void. The product is NOT supplied with
engine oil, although traces of oil from the manufacturing process may be present. It is essential to add adequate engine
oil of the correct type to the engine before use – see Checking and Changing Engine Oil. Failure to add engine oil will void the product warranty.
Engine Oil
Air Filter
Four-stroke engines require engine oil in the crankcase for lubrication of internal components. Severe or irreparable damage may occur if the
engine is allowed to run without engine oil. The engine oil level requires regular maintenance. Check the engine oil level and ensure that the oil
level is at or just under the maximum level indicator.
Some machines may feature an oil level sensor that will prevent the engine being started or automatically stop the engine if the oil level falls
below an acceptable level. This system, however, is not to be solely relied upon. Always check that the engine oil level is at or near the “MAX”
indicator before starting the engine. See Checking and Changing Engine Oil.
The air lter is used to prevent dirt and other particles from possibly entering the engine and causing internal damage to it. The air lter requires
regular maintenance.
Always check the air lter before starting the engine. See Checking, Cleaning and Replacing the Air Filter.
Adequately ll the fuel tank with the correct fuel type.
• Use non-ethanol unleaded (higher RON values will provide best engine performance). Do not use old or contaminated fuel.
• To fill or top up fuel:
• Place the machine in an upright position on a flat and level surface.
• Clean the machine around the fuel filler so that no dirt or other material enters the engine when the cap is removed.
• Remove (rotate left) the fuel filler cap.
• Using a funnel, carefully fill the tank with fuel. Do not fill above the top of the strainer (if equipped) or otherwise overfill the tank.
• When finished, reinstall (rotate right) the fuel filler cap until firm. Wipe away any residual fuel from the machine. If fuel has been spilt,
move the pump away from the spillage before starting the engine.
Petrol/fuel/gasoline is extremely ammable – keep clear of naked ames or other ignition sources. The engine must be
cool before refuelling.
Fuel

08 © Böhmer-AG 2020
AG-178FD / AG-192FD
Priming the Fuel System
When an engine is new or has been completely run out of fuel it may be necessary to “prime”
the fuel system before attempting to start the engine. This means removing any air from the
fuel line. To prime:
• Fill the fuel tank with fuel.
• Remove the fuel line from the carburettor or fuel injector using pliers to loosen the
hose-clamp. Hold a container beneath the fuel line to catch any spilt fuel.
• Place the fuel tap (A) in the “ON” position and allow fuel to flow out (into the
container) until no air bubbles can be seen in the fuel stream.
• Push the fuel line back onto its connection point and re-fasten the hose clamp.
• Clean up any spilled fuel. If fuel has been spilt, move the pump away from the
spillage before starting the engine.
• Start the engine.
Before Use Checklist Continued
A

09
© Böhmer-AG 2020
AG-178FD / AG-192FD
Mounting & Connecting to the Engine
Always measure the actual unit before building or drilling mounting frames, drive pulleys etc.
Each engine features a set of holes in the base for mounting and a keyed output shaft. It is essential that the engine be mounted to a suitable
surface, frame etc that is capable of supporting the weight of the engine as well as any twisting forces it generates.
25.4mm (1”) Output Shaft (not to scale)
Output Shaft Flange
Output Shaft
Engine Mounting

10 © Böhmer-AG 2020
AG-178FD / AG-192FD
Engine Starting and Operation
Before starting the engine, ensure that you have followed
all procedures described in the Before Use Checklist. The product is NOT supplied with engine oil, although traces of
oil from the manufacturing process may be present. It is essential to add adequate engine oil of the correct type to the
engine before use – see Checking and Changing Engine Oil. Failure to add engine oil will void the product warranty.
Different models may feature variations in design; for example, some have different engine types, electric start etc. The following procedures
and images are typical to all models, however, the position or appearance of controls etc may vary. All major engine controls are identied on the
machine by way of stickers or other markings.
Manual/Pull Starting
01. PRIME – If necessary, “prime” the fuel system.
02. FUEL – Place the fuel tap (A) in the “ON” position.
03. IGNITION – Place the engine ON/OFF switch (C) or key
switch (if equipped) in the “ON” (“START”) position.
For key switches, the “OFF” position allows the key
to be removed from the switch. The “ON” position is
reached when the key is rotated to the right from the
“OFF” position.
04. START – Slowly pull out the starter cord (B) until you
feel it engage with the engine, then pull it out rapidly (use both hands
if necessary). The engine should start. Allow the starter cord to rewind
slowly – do not let it “snap” back.
05. WARM-UP – Allow the engine to warm-up and run smoothly.
06. THROTTLE – Adjust the throttle control (C) for the required engine speed
and pumping requirements.
If the engine does not start, repeat step 6 onward. If the engine fails to start after
several attempts, refer to Troubleshooting.
Electric Starting
For models equipped with an electric start option, charge the battery then connect a suitable battery cable (cables may be supplied) between
the battery POSITIVE (“+”) terminal and the starter solenoid POSITIVE terminal (this usually has rubber caps for the connectors). Then, connect a
battery cable between the battery NEGATIVE (“-“) terminal and the starter solenoid NEGATIVE terminal.
01. Follow steps 1 to 5 as per manual/pull starting.
02. START – Turn the ignition key fully to the right to engage the starter motor. The engine should start.
03. WARM-UP – Allow the engine to warm-up and run smoothly.
04. THROTTLE – Adjust the throttle control for the required engine speed and pumping requirements.
If the engine does not start, repeat step 2 onward. If the engine fails to start after several attempts, refer to Troubleshooting.
B A
C

11
© Böhmer-AG 2020
AG-178FD / AG-192FD
Jump Starting
Stopping the Engine
Engine Operation
Environmental Considerations
If the battery does not have enough charge to sufciently crank the engine, the engine can be jump-started. Use a fully charged battery (the
“jump” battery) and suitable jump-starting cables. To jump-start:
01. Ensure the ignition is “OFF” (for some models, this is the position that allows the key to be removed).
02. Connect the jump battery positive (“+”) terminal to the engine battery positive (“+”) terminal.
03. Connect the jump battery negative (“-”) terminal to the engine battery negative (“-”) terminal.
04. Follow the normal electric start procedure from step 2 onward.
Stopping in an Emergency
01. To stop the engine immediately, turn the engine ON/OFF switch or key switch to the
“OFF” position.
Stopping in Normal Use
02. Place the throttle control in the “SLOW” position.
03. Place the engine ON/OFF switch or key switch in the “OFF” position.
04. Place the fuel tap in the “OFF” position.
Once the engine is running and has warmed up, adjust the engine speed as required by moving
the throttle lever (C).
For electric start models, when the engine is running, normal battery charging will occur. The
engine must run for several hours to fully charge the battery.
Altitude
If the engine is being used in altitudes at or above 1500m (approximately 5000’), adjustments to the carburettor may be required. This is because
there is less oxygen in the air as altitude increases, which effectively “enriches”
the ratio of fuel to air going into the engine and the higher the altitude, the
richer the fuel mixture becomes. If the engine is being permanently operated at
high altitude, it is recommended to have an authorized service centre make the
necessary carburettor adjustments. If the engine is used occasionally at altitude
(not extreme altitudes), no adjustments should be required, however, a slight
decrease in engine performance can be expected.
Temperature
If the engine is being used in extremely cold or hot environments; for example,
desert or snow conditions, the type of engine oil may need to be changed to suit
environmental temperatures. Oil thickens as the temperature decreases and
thins as temperature increases, which means that if the engine oil is not suited
to the temperature its ability to properly lubricate the engine may be affected. Use the chart above to determine the correct engine oil.
Engine Starting and Operation Continued
C

12 © Böhmer-AG 2020
AG-178FD / AG-192FD
Maintenance
Running combustion engines in conned areas CAN KILL IN MINUTES. Engine exhaust fumes contain carbon-
monoxide – a deadly gas that you cannot smell or see. NEVER run a combustion engine in conned areas
EVEN IF windows and doors are open. ONLY run combustion engines OUTDOORS and away from doors,
windows and vents. • Petrol/fuel/gasoline is extremely ammable – keep clear of naked ames or other
ignition sources. • Do not have the engine running during inspection and maintenance unless specically required. • The engine should be cool
enough to touch before performing maintenance activities. • Some maintenance activities described may be beyond the scope of some users.
For procedures that you are not comfortable with or have the tools or experience for, have the unit serviced by a service centre or qualied
technician.
Maintenance Schedule
Component/
Task Every Use First Month or 20 Hours Use
Every 3
Months or 50
Hours Use
Every 6
Months or 100
Hours Use
Every Year or
300 Hours Use
Engine Oil Check Replace
Oil Leaks Check/repair as
necessary
Air Cleaner Check Clean and replace as
necessary
Clean and replace as
necessary
Clean and replace as
necessary
Clean and replace as
necessary
Valve Clearance Adjust as necessary
Combustion Chamber De-coke as necessary
Idle Speed Check/adjust as
necessary
Fastners Check/tighten as
necessary
Fuel Tank Flush and clean
Fuel Line Replace as necessary Replace as necessary Replace as necessary Replace as necessary
Fuel Filter Clean and replace as
necessary
Clean and replace as
necessary
Clean and replace as
necessary
Clean and replace as
necessary
Fuel Strainer Check
To keep the machine performing at optimal efciency, regular checks and maintenance is required. Proper care and maintenance ensures best
performance and longest service life.
The maintenance schedule below species preventative maintenance checks and necessary maintenance tasks and how often they should be
performed. The schedule applies to multiple engines; some engines may not include some components, so maintenance on those components is
not applicable.
Harsh operating environments such as extreme temperatures, dust etc may necessitate more
frequent maintenance. • Maintenance frequencies are based on general factors including a maximum use of approximately 300
hours per year. Apply common-sense when following the maintenance schedule based on your actual use of the product. • Keep
reasonable records of maintenance activities for reference. Failure to follow the maintenance schedule, using incorrect or non-
compatible accessories or replacements parts, or general negligence may result in making the product warranty void.

13
© Böhmer-AG 2020
AG-178FD / AG-192FD
Checking and Changing Engine Oil
The product is NOT supplied with engine oil, although traces of oil from the manufacturing
process may be present. It is essential to add adequate engine oil of the correct type to the engine before use. Failure to
add engine oil will void the product warranty. • Always check engine oil level when the machine is in an upright position
on a at and level surface. • Do not use used or contaminated engine oils. • Use only engine oils of the correct type
(see Specications). • Perform the rst oil change within the rst 20 hours of use. Subsequently, change the oil every 20 hours of use. • It is
recommended that the engine be warm, but not hot, when performing oil changes. When the oil is warm it drains faster. • Using dirty or incorrect
engine oil may cause engine damage and void any warranty • Always use suitable tools. • Always dispose of used oil in an environmentally
responsible manner and according to regulations. • Some engines feature oil level detection, which will prevent the engine being started or
automatically stop a running engine if there is insufcient oil. • Always check the oil level and ensure is at or near the “MAX” indicator before
using the machine. • Some models may have 2 oil drain plugs and llers on either side of the engine – it does not matter which one is used.
Four-stroke engines require engine oil in the crankcase for lubrication of internal components. Severe or irreparable damage may occur if the
engine is allowed to run without engine oil. The engine oil level requires regular maintenance as per the maintenance schedule.
To check engine oil level:
01. Place the machine in an upright position on a flat and level surface.
02. Clean the machine around the oil filler cap (A) so that no dirt or other material enters the engine when the cap is removed.
03. Remove the oil filler cap (rotate left) until fully unscrewed. For machines without a dipstick, the oil level is determined by how close
the oil is to the edge of the filler hole. For machines equipped with an oil level dipstick:
• Remove the dipstick (A) and wipe clean with a piece of cloth or paper.
• Insert the dipstick into the oil filler but do not screw it in.
• Remove and inspect the dipstick – the oil level is determined by where oil can be seen on
it.
04. Ensure that the oil level is at or just under the “maximum”. If the oil level is low, add
additional oil until the correct level is reached. If the oil level is too high, drain some oil
until the correct level is reached.
05. When finished, re-install (rotate right) the oil filler cap until firm. Wipe off any residual oil
from the machine.
Oil Filler Port
Fill the oil up to the mouth of the
ller port with the engine placed on
the level. When checking oil, simply
dip the Dipstick into the oil pan. Do
not screw in the Dipstick.
Engine Oil
We recommend A.P.I service
classication of CC or CD. Always use
oil with the correct viscosity for the
ambient temperature in which your
engine is being operated. Use the
chart to correctly choose your engine
oil
A

14 © Böhmer-AG 2020
AG-178FD / AG-192FD
To change the engine oil:
01. Place the machine on a suitable work surface that is flat and level and have a container ready to catch drained oil.
02. Clean the machine around the oil drain plug (B) and oil filler (A) so that no dirt or other material enters the engine when the plug or
cap is removed.
03. Unscrew (rotate left) and remove the drain plug and washer.
04. Tilt the machine and drain all oil from the engine. Once drained, allow the machine to sit level again.
05. Clean the drain plug and washer and then reinstall them. Screw in fully (rotate right) and firmly tighten.
06. Remove the oil filler cap (rotate left) until fully unscrewed. Wipe the oil level indicator clean with a piece of cloth or paper.
07. Using a funnel, carefully add oil to the engine until the “maximum” level is reached. Double- check the oil level (described above).
08. When finished, re-install (rotate right) the oil filler cap until firm. Wipe off any residual oil from the machine.
Checking and Changing Engine Oil Continued
A
B

15
© Böhmer-AG 2020
AG-178FD / AG-192FD
Checking, Cleaning or Replacing the Air Filter
Operating the machine without a functional air lter may cause severe engine damage and will void
any warranty. A dirty or oil saturated air lter will restrict air ow, which can be mistaken as fuel system problems. Check
the condition of the air lter before adjusting engine idle speed, where applicable. If the air lter is damaged (torn, broken,
disintegrating), replace it.
The air lter is used to prevent dirt and other particles from possibly entering the engine and causing internal damage to it. The air lter requires
regular maintenance as per the maintenance schedule.
Air Filter Inspection and Cleaning
Inspect the air lter for dirtiness and debris, damage etc. Clean or replace the lter element as necessary. To clean air lters:
• For foam filters, wash the filter in warm water and mild detergent, then rinse and allow to dry.
• For paper filters, use compressed air to blow particles from it. The air should be blown from the engine side of the filter.
• Clean all other air filter assembly components using water and mild detergent, then dry them.
• For foam filters, place a few drops of clean engine oil on the filter then squeeze it a few times to spread the oil through the filter
material and remove any excess oil.
Air Filter Removal/Installation
To remove the air lter:
01. Unscrew (rotate left) the wing nut (B) securing the air filter cover (C) and remove the cover from the air intake assembly (A).
02. Unscrew (rotate left) the wing nut (D) and remove the filter element (E).
To install the air lter:
01. Re-install the filter element and ensure it is seated correctly on the air intake assembly.
02. Re-install (rotate right) the wing nut and tighten by hand so that the filter element is secure. Do not over- tighten.
03. Re-install the filter cover and secure it with the wing nut (rotate right). Tighten the nut by hand. Do not over-tighten.

16 © Böhmer-AG 2020
AG-178FD / AG-192FD
Transportation and Storage
Always ensure that the machine is cool enough to touch before transporting or storing. Petrol/fuel/gasoline is
extremely ammable – keep clear of naked ames or other ignition sources. Always transport the machine
with the fuel tap and engine ON/OFF switch in the “OFF” position. Drain the fuel tank before transportation or
storage.
• Drain the fuel system by allowing the engine to run until it stops.
• Ensure the fuel tap, engine ON/OFF switch (or key switch, if applicable) are in the “OFF” position.
• Avoid exposing the equipment to direct sunlight, particularly during transportation.
• Ensure the equipment is secure and upright during transport.
• Store the unit in a dry, well-ventilated area and out of the reach of children.
Long Term Storage
Follow the normal procedures for storage, then:
• Drain the fuel system. It is advised to have the fuel tank as empty as possible before draining.
01. Unscrew (rotate left) the carburettor drain plug. Use a suitable container to catch the draining fuel, and allow the fuel to drain. Store
the drained fuel in a properly sealed container.
02. Re-install (rotate right) the carburettor drain plug and tighten.
• Remove the spark plug and put 30ml of clean engine oil into the cylinder. Pull the starter rope slowly to distribute the oil. Re-install
the spark plug.
• Cover the equipment to protect it from dirt and dust.
Preparing for Transport and Storage

17
© Böhmer-AG 2020
AG-178FD / AG-192FD
Troubleshooting
Running combustion engines in conned areas CAN KILL IN MINUTES. Engine exhaust fumes contain carbon-
monoxide – a deadly gas that you cannot smell or see. NEVER run a combustion engine in conned areas
EVEN IF windows and doors are open. ONLY run combustion engines OUTDOORS and away from doors,
windows and vents. • Petrol/fuel/gasoline is extremely ammable – keep clear of naked ames or other
ignition sources. The product is NOT supplied with engine oil, although traces of oil from the manufacturing process may be present. It is essential
to add adequate engine oil of the correct type to the engine before use – see Checking and Changing Engine Oil.
Failure to add engine oil will void the product warranty. • Do not have the engine running during inspection and maintenance unless specically
required. • The engine should be cool enough to touch before performing maintenance activities. • Some maintenance activities described may
be beyond the scope of some users. For procedures that you are not comfortable with or have the tools or experience for, or if problems persist
after following all suggested actions, contact a service centre or qualied technician.
The following information may assist in identifying a problem and rectifying it
Difculty Starting the Engine
Possible Fault Action
Lack of fuel Check that there is fuel in the tank and the fuel tap is in the “ON” position. • To further check if fuel is
reaching the carburettor, remove the carburettor drain plug and check if fuel drains.
Engine ‘OFF’ Ensure engine ON/OFF switch is in the “ON” position.
Engine ‘Flooded’ with fuel Place the choke in “HOT” or “RUN” position. Leave the ON/OFF switch in the “OFF” position. Pull the starter
cord several times to assist clearing excess fuel from engine before attempting to start engine.
Not enough or too much engine oil Check oil level and ensure that the level is at or just below the recommended maximum level.
Possible Fault Action
Blocked Air Filter Check and clean the Air Filter
Idle speed requires adjustment Adjust the idle speed until the engine runs smoothly and at a reasonable speed when idling
Engine Starts but does not Idle

18 © Böhmer-AG 2020
AG-178FD / AG-192FD
Troubleshooting Continued
Possible Fault Action
No fuel or engine oil Check fuel level and ensure adequate fuel is available. For some 4-stroke engines, an engine oil sensor will
automatically switch off the engine or prevent starting if a low engine oil level is detected.
Overheating Allow engine to cool before restarting. If possible, improve engine cooling, such as operating in lower
temperatures or in shade etc.
Difculty restarting the engine after use or engine stops suddenly during use.
Carburettor blocked Clean the carburettor.
Possible Fault Action
Blocked Air Filter Check and clean air lter.
Carbon build-up in engine and/or
entry to exhaust silencer
Remove the engine cylinder head and clean any carbon from the combustion chamber. For the exhaust
silencer, remove it and clean any carbon deposits from the exhaust entry port.
Reduced Engine Speed/Power During Use
Carburettor blocked Clean the carburettor.

19
© Böhmer-AG 2020
AG-178FD / AG-192FD
Specications
AG - 178 FD
Engine Type 4-Stroke, single cylinder
Fuel Type Unleaded non-ethanol petrol
Fuel Tank Capacity 3.6L
Spark Plug Type F7TC, F7RTC
Spark Plug Gap 0.7 to 0.8mm (0.028 to 0.032”)
Valve Clearance Inlet: 0.15mm ± 0.02mm (0.006” to 0.001”)
Exhaust: 0.2mm ± 0.02mm (0.008” to 0.001”)
Engine Oil Type SAE 10W-30 automotive engine oil recommended for general use
Engine Oil Capacity Approximately 0.6L (always check level)
AG - 192 FD
Engine Type 4-Stroke, single cylinder
Fuel Type Unleaded non-ethanol petrol
Fuel Tank Capacity 6L
Spark Plug Type F7TC, F7RTC
Spark Plug Gap 0.7 to 0.8mm (0.028 to 0.032”)
Valve Clearance Inlet: 0.15mm ± 0.02mm (0.006” to 0.001”)
Exhaust: 0.2mm ± 0.02mm (0.008” to 0.001”)
Engine Oil Type SAE 10W-30 automotive engine oil recommended for general use
Engine Oil Capacity Approximately 1.1L (always check level)

20 © Böhmer-AG 2020
AG-178FD / AG-192FD
Service and Maintenance Record
Use the following....
Date Date Date Date Date
Replace
Engine Oil
De-Choke
Combustion
Chamber
Replace Air
Filter
Replace Fuel
Filter
Replace Fuel
Lines
Clean Fuel
Tank
Check/
Adjust Valve
Clearance
Date Date Date Date Date
Replace
Engine Oil
De-Choke
Combustion
Chamber
Replace Air
Filter
Replace Fuel
Filter
Replace Fuel
Lines
Clean Fuel
Tank
Check/
Adjust Valve
Clearance