Hilti DSH 900 User manual

DSH 700 /
DSH 900
Bedienungsanleitung de
Mode d’emploi fr
Istruzioni d’uso it
Manual de instrucciones es
Manual de instruções pt
Gebruiksaanwijzing nl
Használati utasítás hu
Návod k obsluze cs
Návod na obsluhu sk
Upute za uporabu hr
Navodila za uporabo sl
Ръководство за обслужване bg
Instrucţiuni de utilizare ro
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

19
2
"≠
+# +] +[
"Ç
+|
5 +}
+≠ 7 6
+±
4 +{ "#
+“ "“
"[
+Ç
3 "±
8
1
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

ꨍ
ꨏ
ꨔ
ꨑ
ꨎ
ꨐ
ꨕ
ꨒ
ꨓ
2
1/8
1/8
4
2/7/9
3
3
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

1/15
14
2/4
5/13
4
6
3/10
8
7
9
11
4
1
2
5
1
5
7
3
2/4
3
6
6
6
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

2
5
6
3
4
8
9/10
8
7
3/4
3/4
3/4
3/4
11
1/5
1/5
2
10
8 9
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

1/3
1/3
1/3
15
1
3/8
6
5
2/6
4/7
16
15
4
5
0.5mm
2/8
14
6
7
5
1/12
2
10
8
4
4
3
12
2
3
13
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

17
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

ORIGINAL OPERATING INSTRUCTIONS
DSH 700/ DSH 900 cut-off saw
It is essential that the operating instructions
are read before the machine is operated for
the first time.
Always keep these operating instructions to-
gether with the machine.
Ensure that the operating instructions are
with the machine when it is given to other
persons.
Contents Page
1 General information 21
2Description 23
3 Accessories 24
4 Technical data 25
5 Safety instructions 26
6Beforeuse 29
7 Operation 32
8 Care and maintenance 34
9 Troubleshooting 36
10 Disposal 38
11 Manufacturer’s warranty 38
12 EC declaration of conformity (original) 39
1These numbers refer to the corresponding illustra-
tions. The illustrations can be found on the fold-out cover
pages. Keep these pages open while studying the oper-
ating instructions.
In these operating instructions, the designation “the ma-
chine” always refers to the DSH 700 or DSH 900 hand-
held gas saw.
Parts, operating controls and indicators (DSH 700 /
DSH 900) 1
@Forward grip
;Rear grip
=Guide wheels
%Start/stop switch
&Choke lever / half-throttle lock
(Throttle safety grip
)Throttle trigger
+Decompression valve
§Fuel pump
/Starter handle
:Cutting disc
·Clamping screw
$Hole for locking pin for changing cutting discs
£Clamping flange
|Guard (hood)
¡Disc guard adjustment grip
QWater valve
WWater connection
EFuel tank cap
RAir filter cover
TBelt tensioner
ZExhaust / muffler
USpark filter
ISpark plug connector
OType identification plate
DSH-FSC saw carriage 2
@Grip
;Throttle trigger
=Cutting depth adjustment
%Hold-down device
&Water tank
(Water connection
)Axial adjustment
+Throttle cable
§Machine cradle
1 General information
1.1 Safety notices and their meaning
DANGER
Draws attention to imminent danger that will lead to
seriousbodilyinjuryorfatality.
WARNING
Draws attention to a potentially dangerous situation that
could lead to serious personal injury or fatality.
CAUTION
Draws attention to a potentially dangerous situation that
could lead to slight personal injury or damage to the
equipment or other property.
NOTE
Draws attention to an instruction or other useful informa-
tion.
en
21
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

5100 rpm
max.
1.2 Explanation of the pictograms and other
information
Prohibition signs
Transport by
crane is not
permissible.
Warning signs
General
warning Warning: hot surface Warning: Flying sparks
present a fire
risk.
Warning:
Risk of
kickback.
Warning:
Don’t inhale
toxic vapors
or exhaust
fumes.
Minimum
permissible
speed rating
of the cutting
discs used
Obligation signs
Wear
protective
gloves.
Wear safety
shoes. Wear ear protection,
eye
protection,
respiratory
protection
and a hard
hat.
Don’t use
toothed
cutting
discs.
Don’t use
damaged
cutting
discs.
Smoking and
naked flames
prohibited.
Symbols
Revolutions
per minute Read the operating
instructions
before use.
Motor stop
system Fuel pump
Location of identification data on the machine
The type designation and serial number can be found on
thetypeidentificationplateonthemachine.Makeanote
of this data inyour operating instructions and always refer
to it when making an enquiry to your Hilti representative
or service department.
Type:
Generation: 01
Serial no.:
en
22
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

2 Description
2.1 Use of the product as directed
The machine is intended for hand-held or walk-behind
use for dryor wet cutting of asphalt and mineral or metallic
construction materials using abrasive or diamond cutting
discs.
To reduce the amount of dust produced when cutting,
we recommend use of the wet cutting method.
The working environment may be as follows: construction
site, workshop, renovation, conversion or new construc-
tion.
To avoid the risk of injury, use only genuine Hilti ac-
cessories and cutting tools.
Observe the safety rules and operating instructions for
the accessories used.
Working on materials hazardous to the health (e.g. as-
bestos) is not permissible.
Observe the information printed in the operating instruc-
tions concerning operation, care and maintenance.
Nationally applicable industrial safety regulations must
be observed.
The machine is designed for professional use and may
be operated, serviced and maintained only by trained,
authorized personnel. This personnel must be informed
of any special hazards that may be encountered. The
machine and its ancillary equipment may present hazards
when used incorrectly by untrained personnel or when
used not as directed.
Take the influences of the surrounding area into account.
Do not use the power tool or appliance where there is a
risk of fire or explosion.
Modification of the machine or tampering with its parts is
not permissible.
Don’t work in closed, poorly ventilated rooms.
2.2 Items supplied as standard
1Machine
1 DSH tool set
1 Operating instructions
1 DSH consumables kit
2.3 Abrasive cutting discs for hand-guided
gasoline-powered cut-off saws
Abrasive cutting discs for gasoline-powered cut-off saws
are composed of synthetic resin-bonded abrasive gran-
ulate. These cutting discs feature fabric or fiber rein-
forcement which improves their strength, toughness and
breakage resistance.
NOTE
Abrasive cutting discs for gasoline-powered cut-off saws
are used mainly for cutting ferrous and non-ferrous
metals.
NOTE
Various grit types such as aluminum oxide, silicon
carbide, zirconium, etc., with a different bonding material
(matrix) or matrix hardness, are available depending on
the construction material to be cut.
2.4 Diamond cutting discs for hand-guided
gasoline-powered cut-off saws
Diamond cutting discs for gasoline-powered cut-off saws
consist of a steel core (disc) with diamond segments
(metallically bonded industrial diamonds).
NOTE
Segmented diamond cutting discs or those with a con-
tinuous cutting face are mainly used for cutting asphalt
and mineral construction materials.
2.5 Cutting disc specifications
Diamond cutting discs in compliance with the require-
ments of EN 13236 are to be used with the machine.
Synthetic resin-bonded fiber-reinforced cutting discs in
compliance with EN 12413 (straight, not offset, type 41)
mayalsobeusedwiththismachineforworkingonmetals.
The mounting instructions and instructions for use issued
by the disc manufacturer must also be observed.
2.6 Recommendations for use
We recommend that the workpiece is not cut through in
a single operation. Advance to the required depth of cut
by making several to-and-fro movements.
To avoid damaging the diamond cutting disc when dry
cutting, lift the blade out of the cut for approx. 10 seconds
every 30 to 60 seconds while the machine is still running.
To reduce the amount of dust produced when cutting,
we recommend use of the wet cutting method.
en
23
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

3 Accessories
Accessories for the DSH 700 and DSH 900
Designation Short designation Item number, description
Diamond cutting disc 000000, See main catalog.
Abrasive cutting disc 000000, See main catalog.
Two-stroke oil DSH (1 L) 365827
Water supply unit DWP 10 365595
Saw carriage DSH-FSC 431364
Hard hat 267736
Protective glasses I-VO B05 PS clear 285780
Container DSH 365828
Consumables kit DSH 365602
Consumables and wearing parts for the DSH 700
Designation Short designation Item number
Air filter DSH 261990
Cord (5 pcs) DSH 412230
Starter DSH 700 359425
Drive belt DSH 12/14" 359476
Filter element DSH 412228
Spark plug DSH 412237
Tool set DSH 359648
Cylinder set DSH 700 412245
Fastening screw assy. DSH 412261
Flange (2) DSH 412257
Centering ring 20 mm / 1" DSH 412264
Consumables and wearing parts for the DSH 900
Designation Short designation Item number
Air filter DSH 261990
Cord (5 pcs) DSH 412230
Starter DSH 900 359427
Drive belt DSH 12/14" 359476
Drive belt DSH 16" 359477
Filter element DSH 412228
Spark plug DSH 412237
Tool set DSH 359648
Cylinder set DSH 900 412384
Fastening screw assy. DSH 412261
Flange (2) DSH 412257
Centering ring 20 mm / 1" DSH 412264
en
24
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

4 Technical data
Right of technical changes reserved.
NOTE
The vibration emission level given in this information sheet has been measured in accordance with a standardised test
given in EN 19432 and may be used to compare gasoline-powered cut-off saws with each other. It may be used for
a preliminary assessment of exposure. The declared vibration emission level represents the main applications of the
machine. However if the machine is used for different applications, with different accessories or poorly maintained,
the vibration emission may differ. This may significantly increase the exposure level over the total working period. Note
that excessive exposure of the hand-arm system to vibration may cause blood circulation disorders (e.g. Raynaud’s
disease). An estimation of the level of exposure to vibration should also take into account the times when the machine
is switched off or when it is running but not actually doing the job. This may significantly reduce the exposure level
over the total working period. Identify additional safety measures to protect the operator from the effects of vibration
such as: maintain the machine and the accessories, keep the hands warm, organisation of work patterns.
Machine DSH 700 30 cm
/ 12" DSH 700 35 cm /14" DSH 900 35 cm /14" DSH 900 40 cm /16"
Motor type Two-stroke / single-
cylinder/air-cooled Two-stroke / single- cylinder / air-cooled Two-stroke / single- cylinder / air-cooled Two-stroke / single- cylinder / air-cooled
Cubic capacity 68.7 cm³ 68.7 cm³ 87 cm³ 87 cm³
Weight without
cutting disc, tank
empty
11.3 kg 11.5 kg 11.7 kg 11.9 kg
Weight with saw
carriage, without
cutting disc, tank
empty
42.3 kg 42.5 kg 42.7 kg 42.9 kg
Power rating 3.5 kW 3.5 kW 4.3 kW 4.3 kW
Maximum arbor
speed 5,100/min 5,100/min 5,100/min 4,700/min
Engine speed 10,000±200/min 10,000±200/min 10,000±200/min 10,000±200/min
No-load speed 2,500…3,000/min 2,500…3,000/min 2,500…3,000/min 2,500…3,000/min
Dimensions with
cutting disc (L x W x
H) in mm
783 X 261 X 434 808 X 261 X 434 808 X 261 X 434 856 X 261 X 466
Ignition (type) Electronically-
controlled ignition
timing
Electronically-
controlled ignition
timing
Electronically-
controlled ignition
timing
Electronically-
controlled ignition
timing
Electrode gap 0.5 mm 0.5 mm 0.5 mm 0.5 mm
Spark plug Manufacturer: NGK
Type: CMR7A-5 Manufacturer: NGK Type: CMR7A-5 Manufacturer: NGK Type: CMR7A-5 Manufacturer: NGK Type: CMR7A-5
Carburetor Manufacturer: Wal-
bro
Model: WT
Type: 895
Manufacturer: Wal-
bro
Model: WT
Type: 895
Manufacturer: Wal-
bro
Model: WT
Type: 895
Manufacturer: Wal-
bro
Model: WT
Type: 895
Fuel mixture Hilti oil 2% (50:1) or
TC oil 4% (25:1) Hilti oil 2% (50:1) or
TC oil 4% (25:1) Hilti oil 2% (50:1) or TC oil 4% (25:1) Hilti oil 2% (50:1) or TC oil 4% (25:1)
Tank capacity 900 cm³ 900 cm³ 900 cm³ 900 cm³
Cutting disc mount Reversible Reversible Reversible Reversible
Disc drilling dia-
meter/arbor holding
bore
20 mm or 25.4 mm 20 mm or 25.4 mm 20 mm or 25.4 mm 20 mm or 25.4 mm
Max. disc outside
diameter 308 mm 359 mm 359 mm 410 mm
Min. flange outside
diameter 102 mm 102 mm 102 mm 102 mm
en
25
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

Machine DSH 700 30 cm
/ 12" DSH 700 35 cm /14" DSH 900 35 cm /14" DSH 900 40 cm /16"
Max. disc thickness
(steel disc thick-
ness)
5.5 mm 5.5 mm 5.5 mm 5.5 mm
Maximum cutting
depth 100 mm 125 mm 125 mm 150 mm
Sound pressure
level* LpA,eq ISO
19432 (ISO 11201)
99 dB (A) 99 dB (A) 102 dB (A) 102 dB (A)
Uncertainty for
noise pressure level
LpA,eq
2.8dB(A) 2.8dB(A) 3.0dB(A) 3.0dB(A)
Measured sound
power level
2000/14/EC
(ISO 3744)
108 dB (A) 108 dB (A) 112 dB (A) 112 dB (A)
Uncertainty for
measured sound
power level
2.5dB(A) 2.5dB(A) 2.5dB(A) 2.5dB(A)
Guaranteed sound
power level LwA
2000/14/EC (ISO
3744)
111 dB (A) 111 dB (A) 115 dB (A) 115 dB (A)
Vibration value*
ahv,eq front/rear
grip ISO 19432
(EN 12096)
4.5 / 3.2 m/s² 4.7 / 5.0 m/s² 6.3 / 6.2 m/s² 5.2 / 4.5 m/s²
Uncertainty for vi-
bration value 2.4 / 2.1 m/s² 2.2 / 2.1 m/s² 1.9 / 2.7 m/s² 2.3 / 2.1 m/s²
Comment * The sound pres-
sure level and the
vibration values
were determined
allowing for 1/7 no-
load operation and
6/7 full-load opera-
tion.
* The sound pres-
sure level and the
vibration values
were determined
allowing for 1/7 no-
load operation and
6/7 full-load opera-
tion.
* The sound pres-
sure level and the
vibration values
were determined
allowing for 1/7 no-
load operation and
6/7 full-load opera-
tion.
* The sound pres-
sure level and the
vibration values
were determined
allowing for 1/7 no-
load operation and
6/7 full-load opera-
tion.
5 Safety instructions
In addition to the information relevant to safety given
in each of the sections of these operating instructions,
the following points must be strictly observed at all
times.
5.1 General safety rules
a) Use the right tool or machine for the job. Do not
use the tool or machine for purposes for which
it was not intended. Use it only as directed and
when in faultless condition.
b) Avoid touching rotating parts. Switch the power
tool on only after bringing it into position at the
workpiece. Touching rotating parts, especially ro-
tating drill bits, discs or blades, etc. may lead to
injury.
c) Use only the genuine Hilti accessories or ancillary
equipment listed in the operating instructions. Use
of accessories or ancillary equipment not listed in the
operating instructions may present a risk of personal
injury.
d) Always hold the saw and the saw carriage se-
curely with both hands on the grips provided.
Keep the grips dry, clean and free from oil and
grease.
e) Cuts made in loadbearing walls of buildings or other
structures may influence the statics of the structure,
especially when steel reinforcing bars or load-bearing
components are cut through. Consult the structural
engineer, architect, or person in charge of the
building project before beginning the work.
f) Do not overload the machine. It will work more
efficiently and more safely within its intended per-
formance range.
en
26
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

g) Never use the power tool without the guard
(hood).
h) Take steps to ensure that flying sparks from the
power tool do not present a hazard, i.e. by striking
yourself or other persons. Adjust the position of
the disc guard accordingly.
i) Adjust the position of the disc guard on the ma-
chine correctly. The guard must be securely at-
tached to the machine and positioned for max-
imum safety, so the least amount of cutting disc
is exposed towards the operator. The guard helps
to protect the operator from broken disc fragments
and accidental contact with the disc.
j) Store machines in a secure place when not in use.
When not in use, machines must be stored in a
dry, high place or locked away out of reach of
children.
k) Switch the machine off before transporting it.
l) When laying the machine down, make sure that it
stands securely.
m) Switch the machine off after use.
n) Have your power tool servicedby a qualified repair
person using only identical replacement parts.
This will ensure that the safety of the power tool is
maintained.
o) Maintain the machine carefully. Check for mis-
alignment or binding of moving parts, breakage
of parts and any other condition that may affect
the machine’s operation. If damaged, have the
machine repaired before use. Poor maintenance is
the cause of many accidents.
p) Set the switch to the “stop” position before chan-
ging the cutting disc or adjusting the guard.
q) Don’t leave the machine unattended while the
motor is running.
r) Always apply full throttle when cutting.
s) Hold the machine by insulated gripping surfaces
when performing an operation where the cutting
disc may contact hidden wiring. Contact with a
“live” wire will make exposed metal parts of the
machine “live” and shock the operator.
t) Children must be instructed not to play with the
machine.
u) The machine is not intended for use by debilitated
persons or children.
v) Lifting the saw and saw carriage by crane is not
permissible.
w) Do not stand the saw and saw carriage on an
inclined surface. Always check to ensure that the
saw and saw carriage are standing securely.
5.2 Proper organization of the work area
a) Ensure that the workplace is well lit.
b) Ensure that the workplace is well ventilated. Ex-
posure to dust at a poorly ventilated workplace may
result in damage to the health.
c) Don’t work in closed rooms. Carbon monoxide,
unburned hydrocarbons and benzene in the exhaust
gas may cause asphyxiation.
d) Keep the workplace tidy. Objects which could
cause injury should be removed from the work-
ing area. Untidiness at the workplace can lead to
accidents.
e) Secure the workpiece. When necessary, use
clamps or a vice to secure the workpiece. Don’t
hold the workpiece by hand.
f) Dress properly. Do not wear loose clothing or
jewellery. Keep your hair, clothing and gloves
away from moving parts. Loose clothes, jewellery
or long hair can be caught in moving parts.
g) It is recommended that non-slip shoes or boots
are worn when working outdoors.
h) Keep children away. Keep other persons away
from the working area.
i) Do not overreach. Keep proper footing and bal-
ance at all times. This enables better control of the
power tool in unexpected situations.
j) Fit the filled water tank to the saw carriage only
after fitting the saw to the saw carriage. This will
prevent the saw carriage falling over.
k) Concealed electric cables or gas and water pipes
present a serious hazard if damaged while you
are working. Accordingly, check the area in which
you are working beforehand (e.g. using a metal
detector). External metal parts of the machine may
become live, for example, when an electric cable is
damaged accidentally.
l) Don’t work from a ladder.
m) Don’t work above shoulder height.
n) If the work involves breaking right through, also
apply the appropriate safety measures at the op-
posite side. Parts breaking away could fall out and /
or fall down and injure other persons.
o) Secure the area below the working area.
p) When using the wet cutting technique, take care
to ensure that the water drains away in controlled
fashion and check that the water or water spray
presents no hazard and causes no damage to the
surrounding area.
q) Secure the area below the working area.
5.3 Thermal
a) Wear protective gloves when changing cutting
tools as they get hot during use.
b) The exhaust system and motor get very hot. Always
hold the machine securely with both hands on the
grips provided.
5.4 Liquids (gasoline and oil)
a) Store gasoline and oil in a well-ventilated room in
fuel containers in compliance with regulations.
en
27
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

b) Allow the machine to cool before refueling.
c) Use a suitable funnel when refueling.
d) Don’t use the gasoline or other flammable liquids
for cleaning.
e) Don’t refuel the machine at the workplace.
f) When refueling, take care to avoid spillage of
gasoline.
5.5 Sawing slurry
Avoid skin contact with sawing slurry.
5.6 Vapors
a) Don’t smoke when filling the tank with fuel!
b) Avoid inhaling gasoline vapors and exhaust
fumes.
c) Hotexhaustgasescontainingsparksorsparksgen-
erated by the cutting operation may cause fire or
explosion. Take care to ensure that the sparks
generated do not ignite flammable (gasoline, dry
grass, etc.) or explosive (gas, etc.) substances.
5.7 Dusts
a) Large quantities of dust hazardous to the health are
generated when cutting (especially when dry cutting).
The operator and bystanders must wear suitable
dust masks while the machine is in use.
b) Dust or vapors containing chemical substances may
be generated when working on unknown materi-
als. These substances could cause serious damage
to the health. Obtain information about hazards
presented by the materials from the client or the
authorities responsible. The operator of the ma-
chine and any bystanders must wear respiratory
protection that is approved for use in conjunction
with the applicable substance.
c) To reduce the amount of dust generated when
cutting mineral materials and asphalt, we recom-
mend use of the wet cutting technique.
d) Dust from material such as paint containing lead,
some wood species, minerals and metal may be
harmful. Contact with or inhalation of the dust may
cause allergic reactions and/or respiratory diseases
to the operator or bystanders. Material containing
asbestos must only be treated by specialists. To re-
duce the amount of dust produced when cutting,
we recommend use of the wet cutting method.
Ensure that the workplace is well ventilated. The
use of a dust mask of filter class P2 is recommen-
ded. Follow national requirements for the materi-
als you want to work with.
5.8 Requirements to be met by users
a) Improve the blood circulation in your fingers by
relaxing your hands and exercising your fingers
during breaks between working.
b) Stay alert, watch what you are doing and use com-
mon sense when operating the machine. Don’t
use the machine when you are tired or under the
influence of drugs, alcohol or medication. Amo-
ment of inattention while operating machines may
result in serious personal injury.
5.9 Safety warnings for abrasive cutting-off
operations
a) Check that the cutting disc is fitted in accordance
with the manufacturer’s instructions.
b) Cutting discs must be stored and handled care-
fully in accordance with the manufacturer’s in-
structions.
c) Use only cutting discs with a rated maximum
permissible speed which is at least as high as the
machine’s highest running speed.
d) Cutting discs which are damaged or out of round
(causing vibration) must not be used.
e) The outside diameter and the thickness of the
cutting disc must be within the capacity rating of
the machine. Incorrectly sized accessories cannot
be adequately guarded or controlled.
f) Don’t use toothed cutting discs (saw blades or
similar). Bladesordiscsofthiskindfrequentlycause
kickback or loss of control of the machine.
g) Guide the machine evenly and do not apply lateral
pressure to the cutting disc. Always bring the
machine into contact with the workpiece at right
angles. Don’t attempt to alter the line of cut by
applying lateral pressure or by bending the cutting
disc while cutting is in progress. This presents a
risk of damaging or breaking the cutting disc.
h) Don’t attempt to brake the cutting disc with the
hand.
i) The cutting disc and flange or any other accessory
must fit the arbor of the machine exactly. Cutting
discs or accessories with arbor holes that do not
match the mounting hardware of the machine will run
out of balance, vibrate excessively and may cause
loss of control.
j) Always use undamaged disc mounting flanges of
the correct diameter for the cutting discs used.
Correctly sized flanges support the cutting disc and
thus reduce the possibility of disc breakage.
k) When fitting the cutting disc, always take care
to ensure that the disc’s specified direction of
rotation corresponds to the direction of rotation
of the machine.
en
28
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

l) Store the cutting disc in accordance with the man-
ufacturer’s recommendations. Incorrect or care-
less storage may damage the cutting disc.
m) Don’t use cutting discs with a thickness greater
than 5.5 mm (0.22").
n) Remove the cutting disc from the machine after
use. The cutting disc may suffer damage if the ma-
chine is transported with the disc fitted.
o) Abrasive cutting discs for gasoline-powered cut-
off saws which are used for wet cutting must be
used up the same day as long periods of exposure
to moisture have a negative effect on the strength
of the disc.
p) Observe the expiry date for resin-bonded cutting
discs and don’t use the discs after this date.
q) Resharpen polished diamond segments (no dia-
monds project from the segment matrix) by cut-
ting with the disc in a very abrasive material such
as sandstone.
r) Don’t use damaged diamond cutting discs (cracks
in the steel disc, broken or polished segments,
damaged arbor hole, bent or distorted steel disc,
heavy discoloration due to overheating, steel disc
worn away beneath the segments, diamond seg-
ments with no lateral overhang, etc.)
5.10 Personal protective equipment
The user and any other persons in the vicinity must
wear suitable eye protection, a hard hat, ear protec-
tion, protective gloves and safety footwear while the
machine is in use.
6Beforeuse
6.1 Fuel
NOTE
The two-stroke motor runs on a mixture of gasoline and
oil. The quality of the fuel mixture decisively influences
the running and life expectancy of the motor.
CAUTION
Avoid direct skin contact with gasoline.
CAUTION
Ensure that the workplace is well ventilated in order
to avoid breathing in gasoline fumes.
CAUTION
Use a fuel container that complies with the applicable
regulations.
CAUTION
Alkylategasolinedoesnothavethesamedensity(specific
weight) as conventional gasoline. To avoid damage when
alkylate gasoline is used, the machine must be readjusted
by Hilti Service. Alternatively, the oil content can be
increased to 4% (1:25).
6.1.1 Two-stroke oil
Use Hilti two-stroke oil for air-cooled motors or a good
quality two-stroke oil with the TC classification.
6.1.2 Gasoline
Use regular or super gasoline with an octane rating of at
least 90 ROZ.
The alcohol content (e.g. ethanol, methanol...) of the fuel
used must not exceed 10%, otherwise the life expectancy
of the motor will be greatly reduced.
6.1.3 Mixing fuel
CAUTION
The motor will suffer damage if run with fuel mixed in
the wrong ratio or with unsuitable oil. Use the following
mix ratio with Hilti two-stroke oil: 1 part oil + 50 parts
gasoline. Use the following mix ratio with quality two-
stroke oil with the TC classification: 1 part oil + 25
parts gasoline.
1. Pour the required quantity of two-stroke oil into the
fuel container.
2. Add the gasoline to the fuel container.
3. Close the cap on the fuel container.
4. Mix the fuel by shaking the fuel container.
6.1.4 Storing the fuel mixture
CAUTION
Pressure may build up in the fuel tank. Accordingly, take
care when opening the fuel tank cap.
CAUTION
Store the fuel in a dry, well-ventilated room.
Mix only enough fuel for a few days’ use.
Clean the fuel container occasionally.
en
29
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

5100 rpm
max.
6.1.5 Filling the machine with fuel
CAUTION
Don’t refuel the machine right at the place where you
are working (move at least 3 meters (10 feet) away
from the object you have been cutting).
DANGER
Don’t smoke when filling the tank with fuel!
CAUTION
Don’t refuel the machine in a room where a naked
flame or sparks could ignite the gasoline vapors.
CAUTION
Don’t refuel the machine while the motor is running.
CAUTION
Don’t refuel the machine while the motor is hot.
CAUTION
Wear suitable protective gloves when refueling.
CAUTION
Take care to avoid spilling fuel.
CAUTION
If your clothing becomes soiled with gasoline while
refueling, you must change your clothing.
CAUTION
After refueling, clean the machine and accessories to
remove any spilt fuel.
DANGER
Check to ensure there isno leakage from the machine.
Don’t start the machine if fuel is found to be leaking
from it.
1. Mix the fuel (two-stroke oil / gasoline mixture) by
shaking the fuel container.
2. Place the machine in a steady upright position.
3. Open the fuel tank cap by turning it counterclock-
wise.
4. Fill the tank slowly using a funnel.
5. Close the fuel tank cap by turning it clockwise.
6. Close the cap on the fuel container.
6.2 Fitting and changing the cutting disc 3
CAUTION
Cutting discs which are damaged or out of round
(causing vibration) must not be used.
CAUTION
The maximum permissible speed of the disc or blade
must be at least as high as the maximum speed
printed on the machine.Accessories driven at a speed
above their maximum permissible speed may break and
fly apart.
CAUTION
Use only cutting discs with a 20 mm or 25.4 mm (1")
arbor hole.
CAUTION
The cutting discs, flanges or other accessories must
properly match the arbor size of the machine. Cut-
ting discs or accessories with arbor holes that do not
match the mounting hardware of the machine will run out
of balance, vibrate excessively and may cause loss of
control.
CAUTION
Don’t use synthetic resin-bonded fiber-reinforced
cutting discs that have exceeded their use-by date.
CAUTION
Don’t use damaged diamond cutting discs (cracks in
the steel disc, brokenorpolished segments, damaged
arbor hole, bent or distorted steel disc, heavy discol-
oration due to overheating, steel disc worn away
beneath the segments, diamond segments with no
lateral overhang, etc.)
1. Insert the locking pin in the hole in the drive belt
cover and turn the cutting disc until the locking pin
engages.
2. Use the wrench to release the clamping screw by
turning it counterclockwise.
3. Remove the clamping flange and the cutting disc.
4. Check that the mounting bore of the cutting disc to
be fitted corresponds with the centering collar of the
cutting disc mounting flange. The mounting flange
is provided with a 20 mm diameter centering collar
on one side and a 25.4 mm (1") diameter centering
collar on the opposite side.
5. Clean the clamping and centering surfaces on the
machineandonthecuttingdisc.
6. CAUTION Take care to ensure that the direction
of rotation of the cutting disc (indicated by an ar-
row) matches the direction of rotation shown on the
machine.
Place the cutting disc on the centering collar of the
clamping flange.
7. Place the clamping flange on the drive arbor and
tighten the cutting disc clamping screw by turning it
clockwise.
8. Insert the locking pin in the hole in the drive belt
cover and turn the cutting disc until the locking pin
engages.
9. Tighten the cutting disc clamping screw to a torque
of 25 Nm.
en
30
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

6.3 Adjusting the guard
DANGER
Don’t operate the machine without the protective
devices that belong to it.
DANGER
Adjust the guard to the correct position. Direct the
particles of material removed away from the operator
and the machine.
WARNING
The motor and the cutting disc must have come to a
complete stop before making adjustments or chan-
ging parts etc.
Hold the guard by the grip provided and rotate it to the
desired position.
6.4 Converting the saw from normal cutting mode
to flush cutting mode 4
DANGER
Adjust the guard to the correct position. Direct the
particles of material removed away from the operator
and the machine.
NOTE
After completion of flush cutting it is recommended that
the saw is converted back to normal cutting mode due to
the more favorable balance in this position.
NOTE
After doing this, check that the cutting disc can be turned
easily by hand and that all screws have been tightened
securely.
DANGER
Don’t operate the machine without the protective
devices that belong to it.
In order to facilitate cutting as closely as possible to
edges and walls etc., the forward section of the saw arm
can be turned and fitted in the reversed position so that
the cutting disc, when seen from behind, is positioned to
the right of the saw arm.
1. Remove the spray jets from the guard.
2. Slacken the three clamping nuts on the forward
section of the saw arm approx. one complete turn.
3. Release the tension on the drive belt by turning the
belt tensioning cam counterclockwise carefully as
far as it will go (until resistance is felt, i.e. approx. ¼
of a turn).
4. Remove the three clamping nuts and the two secur-
ing screws from the forward section of the saw arm,
then remove the drive belt cover and the forward
section of the saw arm.
5. Release the four securing screws on the rear drive
belt cover and remove the cover.
6. Remove the stop screw that limits rotation of the
forward section of the saw arm.
7. Place the drive belt carefully over the drive pulley.
8. Fit the forward section of the saw arm onto the rear
section of the saw arm. Fit only the middle clamping
nut. Tighten the nut only finger-tight.
9. Rotate the disc guard until the opening is at the rear.
10. Tension the drive belt by turning the belt tensioning
cam clockwise carefully as far as it will go (until
resistance is felt, i.e. approx. ¼ of a turn).
11. Secure the forward drive belt cover with the two
clamping nuts and two securing screws.
12. Tighten the three clamping nuts securely (18 Nm).
13. Fit the rear drive belt cover and secure it with the
four screws.
14. Rotate the disc guard until the opening is at the
front.
15. Fit the spray jets in the openings at the front of the
blade guard.
6.5 Locking rotary movement of the guide
wheels 5
WARNING
When working on roofs, scaffolds and/or slight
slopes, always lock the guide wheels to prevent the
saw rolling away inadvertently and possibly falling.
Use the built-in safety feature which allows you
to lock the wheels by fitting them in the reversed
position (turned through 180°).
1. Release the guide wheel mounting screws and re-
move the guide wheels.
2. Reverse the guide wheels (turn through 180°) and
refit the mounting screws.
3. Check that the guide wheels are mounted securely.
6.6 Saw carriage 6
NOTE
We recommend use of the saw carriage when the ma-
chine is used extensively for floor sawing.
en
31
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

NOTE
Especially when using the machine in this configuration
for the first time, check to ensure that the throttle cable is
correctly adjusted. When the throttle control is pressed
fully, the machine must run up to maximum speed. If this
is not the case, the throttle cable can be readjusted by
way of the cable tensioner.
CAUTION
Switch off the saw at the stop switch immediately if
the throttle cable on the saw carriage gets stuck.
DANGER
Before starting the engine, check that the saw is
correctly secured to the saw carriage.
1. Move the cutting depth adjustment lever into the
upper position.
2. Open the hold-down device by releasing the screw
knob.
3. Fit the saw into the forward mount with the wheels
as shown and swing the grip of the saw under the
hold-down device.
4. Secure the saw by tightening the screw knob.
5. Fit the water tank after filling it.
6. Adjust the grip to a convenient working height.
7. Adjust the guard to the correct position.
7Operation
7.1 Starting the motor 7
WARNING
Risk of burns! The muffler becomes very hot during
operation and retains heat for a long time after the engine
has been stopped. This is the case even with the engine
idling. Wear protective gloves and do not touch the
hot muffler! Contact with the hot muffler may result in
severe burns.
WARNING
Risk of injury! A damaged muffler may cause the per-
missible noise level to be exceeded, presenting a risk
of severe damage to the hearing or hearing loss. Never
operate the machine if the muffler is damaged, miss-
ing or if it has been modified in any way. A damaged
muffler must be replaced.
NOTE
Risk of fire! The hot muffler may cause flammable material
to catch fire. Never place the hot machine on or against
flammable material!
NOTE
The muffler incorporates a catalytic converter, needed in
order to ensure the engine complies with current emis-
sions standards. Never attempt to modify or remove
the catalytic converter: in doing so, you will be break-
ing the law.
CAUTION
Working on the material may cause it to splinter. Wear
eye protection and protective gloves. Wear breathing
protection if no dust removal system is used. Splin-
tering material presents a risk of injury to the eyes and
body.
CAUTION
The power tool and the cutting operation generate noise.
Wear ear protectors. Exposuretonoisecancausehear-
ing loss.
CAUTION
Thecuttingdiscandpartsofthemachinegethotdur-
ing use. Wear protective gloves when changing the
cutting disc. Touch the machine only at the grips
provided. You may otherwise burn your hands. Take
care to ensure that the machine, when hot, does not
come into contact with inflammable materials during
transport or storage.
WARNING
Keep other persons approx. 15 m away from your
workplace. Pay special attention to the working area
behind you.
DANGER
Don’t work in closed rooms. Carbon monoxide, un-
burned hydrocarbons and benzene in the exhaust gas
may cause asphyxiation.
WARNING
When the motor is idling, the cutting disc must come
to a complete stop. If this is not the case, the idling
speed must be reduced accordingly. If this is not
possible or does not achieve the desired result, the
machine must be returned for repair.
WARNING
If you notice that the throttle trigger has jammed,
stop the motor immediately by operating the on / off
switch.
en
32
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00

WARNING
After fitting a new cutting disc, the machine must be
allowed to run at full speed under no load for approx.
1 minute.
WARNING
Before using the machine, check to ensure that the
start / stop switch functions correctly. The motor
must stop running when the switch is moved to the
“stop” position.
1. Stand the machine on a solid surface on the floor.
2. Move the start / stop switch to the “start” position.
3. Press the fuel pump button (P) 2 to 3 times (until
the pump button is seen to be completely filled with
fuel).
4. Press the decompression valve.
5. If the motor is cold, pull the choke lever upwards.
This activates the choke and engages half throttle.
6. If the motor is hot, pull the choke lever up and then
push it back down. This engages half throttle (with
no choke).
7. Check that the cutting disc is free to rotate.
8. Hold the forward grip securely with the left hand and
place your right foot in the lower section of the rear
grip.
9. Pull the starter handle slowly with your right hand
until resistance is felt.
10. Pull the starter handle vigorously.
11. When the motor fires for the first time (after 2 to 5
pulls of the starter), move the choke lever back to
its original position.
12. Repeat this procedure, with the choke disengaged,
until the motor starts.
NOTE The motor will flood if the starting procedure
is repeated too many times with the choke engaged.
13. Press the throttle briefly as soon as the motor starts.
This disengages the half-throttle position and the
choke (if previously engaged), and the motor then
runs at idling speed when the throttle is released.
7.2 Cutting techniques
DANGER
Always hold the saw and the saw carriage securely
with both hands on the grips provided. Keep the grips
dry, clean and free from oil and grease.
DANGER
Check that no persons are present within the working
area and, in particular, in the area ahead of the saw
(in the cutting direction).
DANGER
Guide the machine evenly and do not apply lateral
pressure to the cutting disc. Always bring the machine
into contact with the workpiece at right angles. Don’t
attempt to alter the line of cut by applying lateral
pressure or by bending the cutting disc while cutting
is in progress. This presents a risk of damaging or
breaking the cutting disc.
CAUTION
Secure the workpiece and the part to be cut off in
order to prevent uncontrolled movement.
NOTE
Always apply full throttle when cutting.
NOTE
Avoid making excessively deep cuts. Cutting through
thick workpieces should be accomplished, as far as
possible, by making a several cuts.
7.2.1 Avoiding stalling 8
CAUTION
Avoid applying excessive pressure when cutting and
don’t allow the cutting disc to stick and stall. Don’t
attempt to cut to great depth immediately. Applica-
tion of excessive pressure increases the risk of cutting
disc distortion. Allowing the cutting disc to stick or stall
increases the probability of kickback or disc breakage.
CAUTION
Support slabs or large workpieces so that the kerf
remains open during the cutting operation.
7.2.2 Avoiding kickback 9
CAUTION
Always bring the machine into contact with the work-
piece from above. Allow the cutting disc to contact
the workpiece only at a point below its rotational axis.
CAUTION
Take special care when inserting the cutting disc in
an existing kerf.
7.3 Stopping the motor
WARNING
If the motor cannot be stopped by operating the on /
off switch, the motor must be stopped, if need be, by
pulling the choke lever.
WARNING
Do not lay the machine down until the cutting disc
has stopped rotating. The machine must always be
stored and transported in an upright position.
1. Release the throttle trigger.
2. Move the start / stop switch to the “stop” position.
en
33
Printed: 07.07.2013 | Doc-Nr: PUB / 5128401 / 000 / 00