Chicago Pneumatic STG 244 Maintenance and service guide

Safety and operating instructions
Trowel
STG 244, 375, 479
www.cp.com

Contents
Introduction ............................................................................................................................................. 5
About the Safety and operating instructions .................................................................................... 5
Safety instructions .................................................................................................................................. 5
Safety signal words ............................................................................................................................ 5
Personal precautions and qualications ....................................................................................... 5
Personal protective equipment .......................................................................................................... 5
Drugs, alcohol or medication ............................................................................................................. 5
Operating, precautions ..................................................................................................................... 6
Transport, precautions .......................................................................................................................... 9
Maintenance, precautions ..................................................................................................................... 9
Storage, precautions .............................................................................................................................. 9
Overview ................................................................................................................................................. 10
Design and function ......................................................................................................................... 10
Main parts ......................................................................................................................................... 10
Labels .................................................................................................................................................. 10
Data plate ........................................................................................................................................ 10
Instruction manual label .................................................................................................................. 11
Lifting point label ............................................................................................................................. 11
Use ear protectors label .................................................................................................................... 11
Blade angle label .............................................................................................................................. 11
Throttle control label ....................................................................................................................... 11
Tilted position label ......................................................................................................................... 11
Cutting hazard label ........................................................................................................................ 11
Safety label ...................................................................................................................................... 11
Transport ................................................................................................................................................ 11
Lifting the machine .......................................................................................................................... 11
Installation ............................................................................................................................................. 12
Fuel ..................................................................................................................................................... 12
Filling ............................................................................................................................................... 12
Fitting and removing the trowel blades ....................................................................................... 13
Operation ............................................................................................................................................... 13
Operating near edges ...................................................................................................................... 14
Start and stop ................................................................................................................................... 14
Before starting ................................................................................................................................. 14
Starting the engine .......................................................................................................................... 14
Stopping the engine ........................................................................................................................ 15
Operating ............................................................................................................................................... 16
Floating .............................................................................................................................................. 16
Finishing ............................................................................................................................................ 16
Manoeuvring the trowel ................................................................................................................. 16
Adjusting the blade angle ............................................................................................................... 17
Twist pitch ....................................................................................................................................... 17
Quick pitch ...................................................................................................................................... 17
When taking a break ....................................................................................................................... 17
Maintenance .......................................................................................................................................... 18
Every 10 hours of operation (daily) .............................................................................................. 18
Checking the engine ........................................................................................................................ 18
STG 244, 375, 479 Contents
9800 1838 01 | Original instructions 3

After the rst 20 hours of operation ............................................................................................ 19
Changing the engine oil .................................................................................................................. 19
Every 200 hours of operation (or monthly) ................................................................................ 19
Checking the V-belt ......................................................................................................................... 19
Checking spark plug ........................................................................................................................ 20
Every 500 hours of operation (or yearly) .................................................................................... 20
Cleaning the fuel tank ...................................................................................................................... 20
Inspection and adjustment of engine ............................................................................................... 20
Cleaning the blade shafts - STG 244 ................................................................................................ 20
Cleaning the blade shafts - STG 375/479 .......................................................................................... 21
Cleaning the pressure plate ............................................................................................................. 21
Repair ...................................................................................................................................................... 21
Clutch wire replacement ................................................................................................................ 21
Storage .................................................................................................................................................... 23
Disposal ................................................................................................................................................... 23
Troubleshooting .................................................................................................................................... 24
Technical data ........................................................................................................................................ 25
Machine data - STG 244 .................................................................................................................. 25
Weights and dimensions for options - STG 244 .......................................................................... 25
Machine data - STG 375 ................................................................................................................... 26
Weights and dimensions for options - STG 375 ........................................................................... 26
Machine data - STG 479 ................................................................................................................... 27
Weights and dimensions for options - STG 479 .......................................................................... 27
Noise and vibration declaration statement ................................................................................. 28
Noise and vibration data ................................................................................................................ 28
Uncertainties, sound value ............................................................................................................. 28
Dimensions ........................................................................................................................................ 29
EC Declaration of Conformity ............................................................................................................. 32
EC Declaration of Conformity (EC Directive 2006/42/EC) ....................................................... 32
Contents STG 244, 375, 479
4 9800 1838 01 | Original instructions

Introduction
Thank you for choosing Chicago Pneumatic brand
products. For over a century, the Chicago
Pneumatic brand has represented performance
and innovation in the pneumatic tool industry.
Today the brand is found around the world on a
range of pneumatic and hydraulic tools that
includes breakers, rock drills, chipping hammers,
clay-diggers, picks and busters, scabblers, pumps
and a whole lot more.
The Chicago Pneumatic brand is associated with
powerful and reliable products that are easy to
maintain and that give good value for the money.
For more information please visit www.cp.com
Construction Tools EOOD
7000 Rousse
Bulgaria
About the Safety and
operating instructions
The aim of the instructions is to provide you with
knowledge of how to use the machines in an
efcient, safe way. The instructions also give you
advice and tell you how to perform regular
maintenance on the machines.
Before using the machines for the rst time you
must read these instructions carefully and
understand all of them.
Safety instructions
To reduce the risk of serious injury or death to
yourself or others, read and understand the Safety
and operating instruction before installing,
operating, repairing, maintaining, or changing
accessories on the machine.
Post this Safety and operating instruction at work
locations, provide copies to employees, and make
sure that everyone reads the Safety and operating
instruction before operating or servicing the
machine. For professional use only.
In addition, the operator or the operator's
employer must assess the specic risks that may be
present as a result of each use of the machine.
Additional instructions for the engine can be
found in the manufacturer's engine manual.
Save all warnings and instructions for future
reference.
Safety signal words
The safety signal words Danger, Warning and
Caution have the following meanings:
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.
Personal precautions and
qualications
Only qualied and trained persons may operate or
maintain the machine. They must be physically
able to handle the bulk, weight, and power of the
machine. Always use your common sense and
good judgement.
Personal protective equipment
Always use approved protective equipment.
Operators and all other persons in the working
area must wear protective equipment, including at
a minimum:
•Protective helmet
•Hearing protection
•Impact resistant eye protection with side
protection
•Respiratory protection when appropriate
•Protective gloves
•Proper protective boots
•Appropriate work overall or similar clothing
(not loose-tting) that covers your arms and
legs.
Drugs, alcohol or medication
WARNING Drugs, alcohol or medication
Drugs, alcohol or medication may impair your
judgment and powers of concentration. Poor
reactions and incorrect assessments can lead to
severe accidents or death.
►Never use the machine when you are tired or
under the inuence of drugs, alcohol or
medication.
STG 244, 375, 479 Safety and operating instructions
9800 1838 01 | Original instructions 5

►No person who is under the inuence of drugs,
alcohol or medication may operate the
machine.
Operating, precautions
DANGER Explosion hazard
If a warm machine or exhaust pipe comes into
contact with explosives, an explosion could occur.
During operating with certain materials, sparks
and ignition can occur. Explosions will lead to
severe injuries or death.
►Never operate the machine in any explosive
environment.
►Never use the machine near ammable
materials, fumes or dust.
►Make sure that there are no undetected sources
of gas or explosives.
►Avoid contact with the warm exhaust pipe or
the bottom of the machine.
DANGER Fire hazard
If a re starts in the machine, it can cause injury.
►If possible use an AB(E)-class powder
extinguisher, otherwise use a B(E)-type carbon
dioxide re extinguisher.
DANGER Fuel hazard
The fuel is ammable and fuel fumes can explode
when ignited, causing serious injury or death.
►Protect your skin from contact with the fuel. If
fuel has penetrated the skin, consult a qualied
health professional.
►Never remove the ller cap, or ll the fuel tank
when the machine is hot.
►Fill the fuel tank outdoors or in a clean and well
ventilated place, free from sparks and open
ames. Fill the fuel tank at least ten meters (30
feet) from the place where the machine is to be
used.
►Release the ller cap slowly to let pressure
escape.
►Never overll the fuel tank.
►Make sure the ller cap is screwed on when the
machine is used.
►Avoid spilling fuel on the machine, wipe off any
spilled fuel.
►Check regularly for fuel leaks. Never use the
machine if it is leaking fuel.
►Never use the machine in the proximity of
material that can generate sparks. Remove all
hot or spark-generating devices before starting
the machine.
►Never smoke when lling the fuel tank or when
working with the machine or servicing it.
►Only store fuel in a container that is specially
constructed and approved for the purpose.
►Consumed fuel and oil containers must be
taken care of and returned to the retailer.
►Never use your ngers to check for uid leaks.
WARNING Unexpected movement
The machine is exposed to heavy strains during
operation. If the machine breaks or gets stuck,
there may be sudden and unexpected movement
that can cause injuries.
►Always inspect the machine prior to use. Never
use the machine if you suspect that it is
damaged.
►Make sure that the handle is clean and free of
grease and oil.
►Keep your feet away from the machine.
►Never sit on the machine.
►Never strike or abuse the machine.
►Pay attention and look at what you are doing.
WARNING Dust and fume hazard
Dusts and/or fumes generated or dispersed when
using the machine may cause serious and
permanent respiratory disease, illness, or other
bodily injury (for example, silicosis or other
irreversible lung disease that can be fatal, cancer,
birth defects, and/or skin inammation).
Some dusts and fumes created by compaction
work contain substances known to the State of
California and other authorities to cause
respiratory disease, cancer, birth defects, or other
reproductive harm. Some examples of such
substances are:
•Crystalline silica, cement, and other masonry
products.
•Arsenic and chromium from chemically-treated
rubber.
•Lead from lead-based paints.
Dust and fumes in the air can be invisible to the
naked eye, so do not rely on eye sight to
determine if there is dust or fumes are the air.
To reduce the risk of exposure to dust and fumes,
do all of the following:
►Perform site-specic risk assessment. The risk
assessment must include dust and fumes
Safety and operating instructions STG 244, 375, 479
6 9800 1838 01 | Original instructions

created by the use of the machine and the
potential for disturbing existing dust.
►Use proper engineering controls to minimize
the amount of dust and fumes in the air and to
minimize build-up on equipment, surfaces,
clothing, and body parts. Examples of controls
include: exhaust ventilation and dust collection
systems, water sprays, and wet drilling. Control
dusts and fumes at the source where possible.
Make sure that controls are properly installed,
maintained and correctly used.
►Wear, maintain and correctly use respiratory
protection as instructed by your employer and
as required by occupational health and safety
regulations. The respiratory protection must be
effective for the type of substance at issue (and
if applicable, approved by relevant
governmental authority).
►Work in a well ventilated area.
►If the machine has an exhaust, direct the
exhaust so as to reduce disturbance of dust in a
dust lled environment.
►Operate and maintain the machine as
recommended in the operating and safety
instructions
►Wear washable or disposable protective clothes
at the worksite, and shower and change into
clean clothes before leaving the worksite to
reduce exposure of dust and fumes to yourself,
other persons, cars, homes, and other areas.
►Avoid eating, drinking, and using tobacco
products in areas where there is dust or fumes.
►Wash your hands and face thoroughly as soon
as possible upon leaving the exposure area,
and always before eating, drinking, using
tobacco products, or making contact with
other persons.
►Comply with all applicable laws and
regulations, including occupational health and
safety regulations.
►Participate in air monitoring, medical
examination programs, and health and safety
training programs provided by your employer
or trade organizations and in accordance with
occupational health and safety regulations and
recommendations. Consult with physicians
experienced in relevant occupational medicine.
►Work with your employer and trade
organization to reduce dust and fume exposure
at the worksite and to reduce the risks. Effective
health and safety programs, policies and
procedures for protecting workers and others
against harmful exposure to dust and fumes
must be established and implemented based
on advice from health and safety experts.
Consult with experts.
DANGER Exhaust gas hazard
The exhaust gas from the machine’s combustion
engine contains carbon monoxide which is
poisonous, and chemicals known to the State of
California and other authorities to cause cancer,
birth defects, or other reproductive harm.
Inhalation of exhaust fumes can cause serious
injury, illness, or death.
►Never inhale exhaust fumes.
►Ensure good ventilation (extraction of air by fan
if necessary).
WARNING Projectiles
Failure of the work piece, of accessories, or even of
the machine itself may generate high velocity
projectiles. During operating, splinters or other
particles from the compacted material may
become projectiles and cause personal injury by
striking the operator or other persons. To reduce
this risk:
►Use approved personal protective equipment
and safety helmet, including impact resistant
eye protection with side protection.
►Make sure that no unauthorised persons
trespass into the working zone.
►Keep the workplace free from foreign objects.
WARNING Rotating blades hazards
There is a risk of hands and feet getting caught by
the rotating blades when the machine is running.
This can cause personal injury.
►Never place your hands or feet inside the
protection ring when the machine is running.
WARNING Motion hazards
When using the machine to perform work-related
activities, you may experience discomfort in the
hands, arms, shoulders, neck, or other parts of the
body.
►Adopt a comfortable posture while maintaining
secure footing and avoiding awkward off-
balanced postures.
►Changing posture during extended tasks may
help avoid discomfort and fatigue.
►In case of persistent or recurring symptoms,
consult a qualied health professional.
STG 244, 375, 479 Safety and operating instructions
9800 1838 01 | Original instructions 7

WARNING Vibration hazards
Normal and proper use of the machine exposes
the operator to vibration. Regular and frequent
exposure to vibration may cause, contribute to, or
aggravate injury or disorders to the operator’s
ngers, hands, wrists, arms, shoulders and/or
nerves and blood supply or other body parts,
including debilitating and/or permanent injuries
or disorders that may develop gradually over
periods of weeks, months, or years. Such injuries
or disorders may include damage to the blood
circulatory system, damage to the nervous system,
damage to joints, and possibly damage to other
body structures.
If numbness, persistent recurring discomfort,
burning sensation, stiffness, throbbing, tingling,
pain, clumsiness, weakened grip, whitening of the
skin, or other symptoms occur at any time, when
operating the machine or when not operating the
machine, stop operating the machine, tell your
employer and seek medical attention. Continued
use of the machine after the occurrence of any
such symptom may increase the risk of symptoms
becoming more severe and/or permanent.
Operate and maintain the machine as
recommended in these instructions, to prevent an
unnecessary increase in vibration.
The following may help to reduce exposure to
vibration for the operator:
►If the machine has vibration absorbing handles,
keep them in a central position, avoid pressing
the handles into the end stops.
►When the percussion mechanism is activated,
the only body contact with the machine you
must have are your hands on the handle or
handles. Avoid any other contact, for example
supporting any part of the body against the
machine or leaning onto the machine trying to
increase the feed force.
►Make sure that the machine is well-maintained
and not worn out.
►Immediately stop working if the machine
suddenly starts to vibrate strongly. Before
resuming the work, nd and remove the cause
of the increased vibrations.
►Participate in health surveillance or monitoring,
medical exams and training programs offered
by your employer and when required by law.
►When working in cold conditions wear warm
clothing and keep hands warm and dry.
See the ”Noise and vibration declaration
statement” for the machine, including the
declared vibration values. This information can be
found at the end of these Safety and operating
instructions.
WARNING Trapping hazard
There is a risk of neck ware, hair, gloves, and
clothes getting dragged into or caught by rotating
machine parts. This may cause choking, scalping,
lacerations, or death. To reduce the risk:
►Never grab or touch a rotating machine part.
►Avoid wearing clothing, neck ware or gloves
that may get caught.
►Cover long hair with a hair net.
DANGER Electrical hazard
The machine is not electrically insulated. If the
machine comes into contact with electricity,
serious injuries or death may result.
►Never operate the machine near any electric
wire or other source of electricity.
►Make sure that there are no concealed wires or
other sources of electricity in the working area.
WARNING Concealed object hazard
During operating, concealed wires and pipes
constitute a danger that can result in serious
injury.
►Check the composition of the material before
operating.
►Watch out for concealed cables and pipes for
example electricity, telephone, water, gas, and
sewage lines.
►If the machine seems to have hit a concealed
object, switch off the machine immediately.
►Make sure that there is no danger before
continuing.
WARNING Involuntary start
Involuntary start of the machine may cause injury.
►Keep your hands away from the start and stop
device until you are ready to start the machine.
►Learn how the machine is switched off in the
event of an emergency.
WARNING Noise hazard
High noise levels can cause permanent and
disabling hearing loss and other problems such as
tinnitus (ringing, buzzing, whistling, or humming
in the ears). To reduce risks and prevent an
unnecessary increase in noise levels:
►Risk assessment of these hazards and
implementation of appropriate controls is
essential.
►Operate and maintain the machine as
recommended in these instructions.
Safety and operating instructions STG 244, 375, 479
8 9800 1838 01 | Original instructions

►If the machine has a silencer, check that it is in
place and in good working condition.
►Always use hearing protection.
Transport, precautions
WARNING Loading and unloading
hazard
When the machine is lifted by a crane and similar
appliance, this can lead to injury.
►Use marked lifting points.
►Make sure that all lifting devices are
dimensioned for the weight of the machine.
►Never remain under or in the immediate
vicinity of the machine.
Maintenance,
precautions
WARNING Unexpected start hazard
During maintenance or when changing blades on
the machine, there is a risk that the engine
backres or that the machine unexpectedly starts.
This applies especially when the engine is hot and
if the switch is in position ON. This can result in
serious personal injury.
►Always let the engine cool down.
►Always turn the switch to position OFF.
►Always take the cap off the spark plug.
WARNING Machine modication
Any machine modication may result in bodily
injuries to yourself or others.
►Never modify the machine. Modied machines
are not covered by warranty or product
liability.
►Always use original parts, working tools and
accessories.
►Change damaged parts immediately.
►Replace worn components in good time.
CAUTION High temperature
The machine's engine exhaust pipe, and bottom
become hot during operation. Touching them can
lead to burns.
►Never touch a hot machine.
►Never touch the bottom of the machine when
its hot.
►Wait until the engine, exhaust pipe, and
bottom of the machine have cooled down
before carrying out maintenance work.
Storage, precautions
◆Keep the machine in a safe place, out of the
reach of children and locked up.
STG 244, 375, 479 Safety and operating instructions
9800 1838 01 | Original instructions 9

Overview
To reduce the risk of serious injury or death
to yourself or others, read the Safety
instructions section found on the previous
pages of this manual before operating the
machine.
Design and function
STG 244, STG 375 and STG 479 are intended to be
used for nishing newly cast concrete surfaces.
The concrete surface can be power oated with a
oating disc or oating blades and power
trowelled with trowelling blades of steel. No other
use is permitted. The surface achieved will be
even, dense and have a high nish.
The trowel series must only be used in well-
ventilated areas, as is the case for all combustion
engine machines.
To choose the correct parts, kits and accessories,
see the spare parts list.
Main parts
A
B
C
D
E
F
G
H
I
J
A. Clutch handle
B. Blade adjustment (twist pitch model)
C. Throttle control
D. Handle folding lock
E. Protective cover
F. Blade
G. Protection ring
H. Support frame / Lifting device
I. Lifting eye
J. Blade adjustment (quick pitch model)
K
L
M
P Q
NO
R
S
T
K. Spark plug
L. Engine valves
M. Cooling anges
N. Engine oil/dipstick
O. Carburettor
P. Silencer
Q. Fuel ller cap
R. Fuel tank
S. Air lter
T. Recoil starter
Labels
The machine is tted with labels containing
important information about personal safety and
machine maintenance. The labels must be in such
condition that they are easy to read. New labels
can be ordered from the spare parts list.
Data plate
B
Type
xxxxx
Product identification number: xxxxx Made in xxxxxx
Operating mass kg
xxxxx
AC
Rated power kW
xxxxx
Year of Mfg
xxxxx
Construction Tools EOOD
A. Machine type
B. Product Identication Number
C. The CE symbol means that the machine is EC-
approved. See the EC Declaration of
Conformity which is delivered with the
machine for more information.
Safety and operating instructions STG 244, 375, 479
10 9800 1838 01 | Original instructions

Instruction manual label
WARNING
The operator must read the safety, operation and
maintenance instructions before operating the
machine.
Lifting point label
Use ear protectors label
Blade angle label
Throttle control label
Max
Min
Tilted position label
Tilted position
Gekippte lage
Cutting hazard label
Safety label
SKIVA DEMONTERAS FÖRE KRANLYFT.
REMOVE DISC BEFORE CRANELIFT.
SCHEIBE ABMONTIEREN
VOR KRANHEBEN.
◆Remove disc before crane lift.
NOTICE Whether you transport the machine by
hand or by lifting eye, always remove the disc rst.
Transport
Lifting the machine
WARNING Lifting hazard
Never lift the machine without checking if it is
intact. A damaged machine can fall apart, which
can result in serious injury.
►Check that all equipment is dimensioned in
accordance with applicable regulations.
►Never walk or stand under a lifted machine.
►Always use the lifting eye for machine lift.
►Always remove the smoothing disc before
lifting the machine.
►Never use the protection ring as a lifting device.
►Never stand near the machine when lifting and
transporting.
STG 244, 375, 479 Safety and operating instructions
9800 1838 01 | Original instructions 11

►Check the machine's data plate for weight
information.
Lifting the machine
1. Always use the machine's lifting eye (A) to lift
the machine.
A
2. Lifting equipment must be dimensioned in
order to full all regulations.
Lifting by hand
1. When lifting by hand use the operator handle
(B) and the lift handle/support bar (C) in the
front of the trowel.
B
C
WARNING Transport
During transportation the machine can overturn
and cause serious injury.
►Always strap the machine down.
►Keep your feet away from the machine.
Transporting the machine
1. Secure the machine for all transportation.
2. Fold the upper handle to its lowest position
during transport.
Installation
Fuel
Filling
WARNING Fuel hazard
The fuel is extremely ammable and fuel fumes
can explode when ignited, causing serious injury
or death.
►Protect your skin from contact with the fuel.
►Never remove the ller cap or ll the fuel tank
when the machine is hot.
►Never smoke when lling the fuel tank or when
working with the machine or servicing it.
►Avoid spilling fuel and wipe off any fuel spilled
on the machine.
Filling procedure
1. Stop the engine and let it cool down before
lling the tank.
2. Release the ller cap slowly to let any pressure
escape.
3. Fill the fuel tank to the lower edge of the ller
pipe.
Safety and operating instructions STG 244, 375, 479
12 9800 1838 01 | Original instructions

4. Never overll the tank. Due to the movement
of the fuel within the tank, it is possible to have
fuel at a higher level than the tank cap, which
can lead to a spillage of fuel if the tank cap is
opened. This can be avoided by only opening
the tank cap when the machine is on level
ground and the tank cap is at the fuel tank's
highest point.
Fitting and removing the
trowel blades
◆To prevent an accidental start: Turn the engine
switch to position OFF and let the engine cool
down.
◆Lubricate the blade shafts with recommended
grease using the grease nipple on the hub, see
chapter "Machine data".
Whenever tting or removing the trowel blades
the following instructions must be observed:
STG 244
1. Lean the trowel forwards so it rests on the
support frame.
2. Loosen the screw (A) and remove the spider
assembly.
3. Loosen the screws (B) and change the blades
(C).
B
C
A
STG 375/479
1. Lean the trowel forwards so it rests on the
support frame.
2. Loosen the screw (A) and remove the spider
assembly.
3. Loosen the screws (B) and change the blades
(C).
A
B
C
NOTICE On the 375/479 models the blades are
reversible for double life.
Operation
WARNING Engine running hazard
Vibrations from the engine can cause material
changes, this can cause the machine to move and
cause injuries.
►Never leave the machine with the engine
running.
►Ensure that only authorized personnel operate
the machine.
NOTICE When operating the machine, follow the
instructions in the manual; never sit or stand on
the machine when it is working.
STG 244, 375, 479 Safety and operating instructions
9800 1838 01 | Original instructions 13

Operating near edges
WARNING Overturning hazard
When operating along edges, at least two thirds of
the machine must be on a surface with full bearing
strength, otherwise the machine can tip over.
►Switch off the machine and lift it back on a
surface with full bearing strength.
2/3
Start and stop
Before starting
Follow the general safety precautions supplied
with the machine at delivery. We recommend to
study the engine manual supplied with the
machine. Check that maintenance routines have
been carried out.
◆Check the engine oil level on the dipstick.
◆Fill the fuel tank with fuel.
◆Check that all the controls are working.
◆Make sure that there is no oil leakage, and that
all bolted joints are tightened.
◆After the engine is started, leave the speed
control in the idling position for a few minutes
to warm up the engine without loading it.
Starting the engine
1. Open the fuel cock (A).
2. Set the throttle control (B) for idle speed. Do
not use higher r.p.m. during the start process.
B
3. Close the choke (C) if the engine is cold. If the
engine is warm or the ambient temperature is
high, close the choke halfway or leave it open.
Safety and operating instructions STG 244, 375, 479
14 9800 1838 01 | Original instructions

4. Turn the switch (D) to ON.
5. Hold the operating handle with one hand and
grip the handle of the recoil starter (E) and pull
until resistance is felt. Release the handle to the
initial position, then pull until the engine
starts.
6. Move the choke valve (F) gradually to the fully
open position.
7. Allow the engine to idle a few minutes. Hold
the operating handle in a rm grip. Increase
the engine speed with the throttle control (B)
on the left side while keeping the operating
handle in a rm grip.
B
8. Push the clutch handle (G) on the right side
until it reaches the operating handle. Keep the
clutch handle in this position when operating
the machine.
G
Stopping the engine
1. Release the clutch handle (A) completely.
Avoid any slip of the V-belt by releasing it
quickly. Let the engine idle for a few minutes.
A
NOTICE It is not advisable to run the engine
with the clutch activated except at idle speed.
Therefore, reduce the engine speed to idle
once the machine has come to a full stop.
2. Turn the switch (B) to OFF.
STG 244, 375, 479 Safety and operating instructions
9800 1838 01 | Original instructions 15

3. Close the fuel cock (C).
Operating
Floating
When the slab has set sufciently rm that the
operator's footprint leaves a very slight depression
on the surface of the slab, it is ready for the
oating operation.
Under normal operating conditions the machine
should cover as much as 1000 sq. ft. in about 15
minutes. It is recommended that a slight tension
on the trowel control cable (but not a denite tilt),
during the oating operation will cause the
machine to operate much smoother. After the
oated slab has set sufciently, it is ready for the
nishing operation.
NOTICE Do not let the machine stand in one spot
on the soft cement. Lift from the slab when the
oating operation is complete.
Finishing
When starting the nishing operation, never set
the trowels up over 1/4" pitch. Best results are
obtained by letting the machine move right or left,
backwards or forwards, approximately 4" with
each revolution of the trowels. To ll a hole or cut
down a hump, move the unit back and forth over
the problem area.
After the rst pass over the slab, the waiting time
between operations is determined in the same
manner as if you were hand troweling. The entire
application and action of the troweling machine in
regard to getting on the slab, and the correct pitch
of the trowels, is determined in the same manner
as would be used by a cement nisher when
troweling by hand.
NOTICE When using the oating disc, be aware
of the position of the blades. All four blades must
be inside the brackets on the oating disc. Also
check the centre position of the oating disc in
relation to the blade cross, to avoid any
eccentricity during rotation.
NOTICE Observe the concrete surface for
loosened stones during operation. A stone can
make marks on the surface. If this appears during
the end of the operation, when the concrete
surface is hard and close to be nished, the
damage can be hard to restore.
Manoeuvring the trowel
The trowel is manoeuvred by applying force on
the handle in different directions. The procedure
below describes how to move the trowel in
different directions, but just as important is the
balance and smoothness of the operator to
achieve smooth and easy movements of the
machine.
◆Turn to the left:
Lift the handle to turn the trowel to the left.
◆Turn to the right:
Press down the handle to turn the trowel to the
right.
Safety and operating instructions STG 244, 375, 479
16 9800 1838 01 | Original instructions

◆Move forward:
Press down the right side of the handle and lift
the left side of the handle in one movement to
move the trowel forward. This movement can
also be achieved by pushing the handle
forward.
◆Move backward:
Press down the left side of the handle and lift
the right side of the handle in one movement
to move the trowel backward. This movement
can also be achieved by pulling the handle
backward.
Adjusting the blade angle
Twist pitch
The TP models are equipped with a twist pitch
knob for stepless adjusting of the blade angle.
◆To increase the blade angle, turn the twist pitch
knob clockwise.
◆To decrease the blade angle, turn the twist
pitch knob counterclockwise.
Quick pitch
The QP models are equipped with a quick pitch
lever for adjusting of the blade angle.
◆To increase the blade angle, pull the lever
backward.
◆To decrease the blade angle, push the lever
forward.
When taking a break
◆Stop the machine during breaks.
◆During all breaks, put the machine away so
that there is no risk for unintentional start.
STG 244, 375, 479 Safety and operating instructions
9800 1838 01 | Original instructions 17

Maintenance
Regular maintenance is a basic requirement for the
continued safe and efcient use of the machine.
Follow the maintenance instructions carefully.
◆Before starting maintenance on the machine,
clean it in order to avoid exposure to hazardous
substances. See “Dust and fume hazard”.
◆Use only authorised parts. Any damage or
malfunction caused by the use of unauthorised
parts is not covered by warranty or product
liability.
◆When cleaning mechanical parts with solvent,
comply with appropriate health and safety
regulations and ensure there is satisfactory
ventilation.
◆For major service of the machine, contact the
nearest authorised workshop.
◆After each service, check that the machine's
vibration level is normal. If not, contact the
nearest authorised workshop.
NOTICE Never aim a water jet directly at the fuel
ller cap. This is particularly important when using
a high-pressure cleaner.
The trowel can be leaned forwards and positioned
on the front support frame, when service and
maintenance is carried out. This position is also for
the replacement or removal of the blades or
oating disc.
NOTICE Empty the fuel tank before tilting the
machine.
NOTICE Do not tilt the machine in any other
direction. Incorrect tilting or leaning can cause
problems with engine oil pouring out through the
valve into the carburettor.
Every 10 hours of
operation (daily)
Maintenance routines:
◆Check and replenish the fuel.
◆Check and replenish engine oil.
◆Check for oil leaks.
◆Clean the air lter.
◆Check the tightness of all nuts and bolts.
◆Clean the machine. After every working shift
concrete splashes must be removed from the
surfaces when it is still fresh, use high-pressure
water.
◆Check and clean the engine's cooling anges.
See the engine manual for more information.
◆Check that the controls are not damaged and
do not jam.
◆Check all the wires for wear and correct
adjustment.
◆Lubricate the blade shafts.
Checking the engine
◆Check the oil level on the dipstick.
◆Check the fuel level (A).
◆Check the engine for oil leaks.
◆Clean and replace the air lter (B) if necessary.
Safety and operating instructions STG 244, 375, 479
18 9800 1838 01 | Original instructions

B
After the rst 20 hours of
operation
Maintenance routines:
◆Change engine oil.
◆Clean the air lter.
◆Check the engine speed.
◆Lubricate the blade shafts using the grease
nipples placed on the hub.
Changing the engine oil
1. Unscrew the drainage plug (A).
2. Tilt the machine backwards and let the oil
drain in a drainage hose.
3. Clean around the hole (B) where the drainage
plug (A) was placed.
4. Ret the drainage plug (A).
5. Unscrew the dipstick (D).
6. Fill with oil (C).
7. Ret the dipstick (D).
8. Start the engine and allow the engine to idle a
few minutes before increasing to full power.
Every 200 hours of
operation (or monthly)
Maintenance routines:
◆Check the engine speed.
◆Check that the V-belt is not damaged.
◆Change engine oil. See engine manual for
more information.
◆Check and clean the spark plug. See engine
manual for more information.
◆Clean the carburettor's fuel cock. See engine
manual for more information.
◆Clean the silencer's spark catcher. See engine
manual for more information.
CAUTION Cover the V-belt
Running a machine without the protective cover
over the V-belt may cause trapping or machine
damage, which can cause injury.
►Never run the machine without the protective
cover over the V-belt.
►Stop the engine before removing the protective
cover.
Checking the V-belt
A correctly tensioned V-belt increases the life of the
V-belt and provides the best operating comfort.
1. Remove the protective cover (A) by
unscrewing the two screws (B).
AB
2. Check if the V-belt (C) is damaged, replace if
necessary.
3. Check if the belt is correctly tensioned.
4. If the belt is not correctly tensioned, adjust the
clutch wire (D) using the conduit nuts (E).
5. Check the position of the V-belt in relation to
the pins (F). When the clutch handle is pressed
STG 244, 375, 479 Safety and operating instructions
9800 1838 01 | Original instructions 19

down there must be a distance of 1-3 mm
(0.04-0.12 in.) between the pins and the belt.
F
D
E
C
6. Check clutch functionality. When the clutch
handle is released with the engine running, the
handle pole should be still (no handle pole
rotation permitted).
7. If the clutch does not function and the handle
rotates, stop the machine and contact the
nearest authorised workshop.
Checking spark plug
◆Check, clean and replace the spark plug.
Every 500 hours of
operation (or yearly)
Maintenance routines:
◆Adjust valve clearance for intake and exhaust
valves. See engine manual for more
information.
◆Clean and check fuel lter and fuel tank. See
engine manual for more information.
◆Replace air lter.
◆Clean the engine's cooling anges. See engine
manual for more information.
◆Change oil in the engine. See engine manual
for more information.
◆Clean and adjust the carburettor. See engine
manual for more information.
Cleaning the fuel tank
◆Inspect and clean the fuel tank (A).
Inspection and adjustment of engine
1. Clean and adjust the carburettor (A).
2. Clean engine cooling anges (B).
3. Adjust the engine's valve (C) clearance.
Cleaning the blade shafts - STG 244
Disassemble the blade shafts from the hub and
clean the parts carefully. Grease the contact areas
before assembling it again.
1. Remove the screws (A) for the outer ring from
the blade shafts (B).
Safety and operating instructions STG 244, 375, 479
20 9800 1838 01 | Original instructions