Hilti DSH 700 / DSH 700-X / DSH 900 / DSH 900-X Gasoline-Powered Cut-Off Saw

Introduction

This document provides operating instructions for the Hilti DSH 700, DSH 700-X, DSH 900, and DSH 900-X gasoline-powered cut-off saws. These tools are designed for professional use and require trained, authorized personnel for operation, servicing, and maintenance.

The product is a gasoline-powered cut-off saw for wet or dry cutting of asphalt, mineral construction materials, or metals using diamond cutting discs or abrasive cutting discs. It can be held and guided by hand or mounted on a saw trolley. The saw is not suitable for use in environments where there is a risk of fire or explosion.

Information about the Documentation

Explanation of Signs Used

Warnings

Warnings alert persons to hazards that occur when handling or using the product. The following signal words are used in combination with a symbol:

• DANGER! ⚠️ Draws attention to imminent danger that will lead to serious personal injury or fatality.
• 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.

Mandatory Signs

The following mandatory signs are used:

• ⛑️ Wear ear protection, eye protection, respiratory protection, and a hard hat.
• ? Wear protective gloves.
• ? Wear safety shoes.

Symbols

The following symbols are used:

• ? Read the operating instructions before use.
• ? Instructions for use and other useful information.
• ❗ Warning.
• ➡️ Rotation direction arrow on the guard.
• ⚙️ Engine stop position.
• ▶️ Engine run position.
• ⛽ Primer bulb.
• H Full-throttle jet adjusting screw.
• L Idling jet adjusting screw.
• T Idling adjusting screw.
• ⛽ Fuel mixture.
• ?️ Fuel tank cap turning direction (to open).
• ❄️ Choke (only on DSH 700 or DSH 900).
• 1/2 Half throttle (only on DSH 700 or DSH 900).

Illustrations

The illustrations in these operating instructions are intended to convey a basic understanding and may differ from the actual version of the product. Item reference numbers are used in the overview illustration. Points to which particular attention must be paid are indicated in the illustrations.

Adhesive Labels on the Machine

Warning signs:

• Warning: Flying sparks present a fire risk.
• Warning: Risk of kickback.
• Warning: Do not inhale toxic vapors or exhaust fumes.
• Maximum arbor speed (5100 rpm).
• Warning: hot surface.

Prohibition signs:

• Do not use toothed cutting discs.
• Do not use damaged cutting discs.
• Smoking and naked flames prohibited.

About this Documentation

Read these operating instructions before the product is used or operated for the first time. Observe the safety instructions and warnings printed in this documentation and on the machine. Always keep the operating instructions with the machine.

Product Information

Safety

Safety Instructions

In addition to the safety rules listed in the individual sections, the following rules must be strictly observed at all times.

Personal Safety

• Use the right machine for the job; do not use it for unintended purposes. Use only as directed and in technically faultless condition.
• Never tamper with or modify the machine.
• The product may only be used by persons trained in its safe use who understand the hazards. It is not intended for use by children.
• Stay alert, use common sense, and do not use the product when tired or under the influence of drugs, alcohol, or medication.
• The user and others in the vicinity must wear ANSI Z87.1 approved protective glasses, a hard hat, ear protection, protective gloves, protective footwear, and breathing protection.
• Always hold the machine with both hands on the provided grips, keeping them dry and clean.
• Never use the machine without the guard (hood). Adjust the guard for maximum safety, exposing the smallest possible part of the cutting disc. Ensure sparks do not present a hazard.
• Before use, or if an obstacle is contacted, check the guard for damage. Replace damaged guards immediately.
• Avoid touching rotating parts – risk of injury!
• Maintain proper footing and balance to control the product better, even in unexpected situations. Avoid unusual body positions.
• Dress properly: do not wear loose clothing or jewelry. Keep hair, clothing, and gloves away from moving parts.
• If the product or cutting disc is dropped, check for damage and replace the disc if necessary.
• Switch the product off before adjusting the guard or changing the cutting disc.
• Wear protective gloves when changing the cutting disc, as it can be hot.
• Ensure a fire-extinguishing agent is available due to flying sparks and flammable fuel.
• Use of reducing sleeves is not permitted.
• The wet cutting method is preferable to reduce dust.
• Avoid skin contact with sawing slurry.
• Dust from materials like lead paint, certain woods, minerals, and metal can be harmful. Material containing asbestos may only be worked on by specialists.
• Ensure the workplace is well-ventilated. A dust mask (filter class P2) is recommended. Follow national requirements.
• Improve blood circulation by relaxing hands and exercising fingers during breaks. Prolonged vibration can lead to disorders of the blood vessels and nervous system.
• Consult a structural engineer or architect before cutting slits in load-bearing walls.
• Apply safety measures at the opposite side of the workpiece when breaking through to prevent debris from injuring others.
• Never leave the product running unattended. Switch off the engine and wait for the cutting disc to stop before placing it down or transporting it.
• If operating without an external water pump, ensure the pump cover is fitted.
• Switch the product off after use.
• Check the product for damage. If parts are damaged, have them replaced before use.
• Use only genuine Hilti accessories and accessory tools.
• Have the product repaired only by qualified, skilled personnel using genuine Hilti spare parts.
• Observe national health and safety requirements.

Electrical Safety

• Before work, check the area for concealed electric cables or gas and water pipes. External metal parts may cause electric shock if an electric cable is damaged.

Safety at the Workplace

• Ensure the workplace is well lit.
• Do not work in closed rooms; exhaust gas can cause asphyxiation.
• Keep the workplace tidy to prevent accidents.
• Hot exhaust gases and sparks can cause fire or explosion. Ensure sparks do not ignite flammable or explosive substances.
• Before fitting the water pump, check that the maximum permitted water supply pressure (6 bar) is not exceeded.
• Fit the filled water tank only after the saw has been mounted on the saw trolley to prevent the trolley from falling over.
• Do not stand the product and saw trolley on an inclined surface. Ensure they are standing securely.

Liquids (Gasoline and Oil) and Vapors

• Allow the product to cool before refueling.
• Never smoke while refueling.
• Do not refuel at the workplace area; move at least 3 meters (10 feet) away. Avoid fuel spillage. Use a suitable funnel.
• Avoid inhaling gasoline vapors and exhaust fumes; ensure adequate ventilation.
• Do not use gasoline or other flammable liquids for cleaning.

Cutting Work Using Cutting Discs

• Use only cutting discs with a rated maximum permissible speed at least as high as the highest spindle speed.
• Check that the outside diameter and thickness of the cutting disc comply with the product's capacity rating.
• Never use cutting discs that are damaged, run untrue, or vibrate.
• Do not use damaged diamond cutting discs (cracks, broken segments, damaged arbor hole, distortion, etc.).
• Do not use toothed accessory cutting tools (e.g., toothed saw blades).
• When fitting the cutting disc, ensure its specified direction of rotation corresponds to the spindle's direction.
• The cutting disc and flange must fit the arbor exactly. Mismatched parts can cause imbalance and vibration.
• Always use an undamaged clamping flange of the correct diameter.
• Guide the product smoothly, do not apply lateral pressure to the cutting disc, and always bring it into contact with the workpiece at right angles.
• Wear protective gloves when changing the cutting disc, as it gets hot.
• Abrasive cutting discs used for wet cutting must be used up the same day.
• Observe expiry dates for resin-bonded cutting discs.

Transport and Storage

• Switch the product off before transporting.
• Remove the cutting disc after use to prevent damage during transport.
• Handle the cutting disc carefully and store it according to manufacturer instructions.
• Always store and transport the product upright.
• Do not carry the saw trolley and product together. Remove the water tank before transporting the saw trolley.
• Do not lift the product or saw trolley by crane.
• Store the product in a secure, dry, high place or locked away out of reach of children.
• Ensure the product stands securely when laid down.
• Allow the product to cool down before packing it away.
• Store gasoline and oil in a well-ventilated room in compliant fuel containers.

Description

Overview of the Product

Gasoline-powered cut-off saw

Illustration: Overview of the gasoline-powered cut-off saw with numbered components.

• 1. Hood
• 2. Water supply
• 3. Forward grip
• 4. Water valve
• 5. Starter handle
• 6. Fuel tank cap
• 7. Choke lever / half-throttle lock (DSH 700 OR DSH 900)
• 8. Throttle trigger
• 9. Rear grip
• 10. Rating plate
• 11. Fuel gauge
• 12. Guide wheels
• 13. Cutting disc
• 14. Clamping screw
• 15. Clamping flange
• 16. Spark plug connector
• 17. Decompression valve
• 18. Throttle safety grip
• 19. Start/stop switch (DSH 700 OR DSH 900)
• 20. Start/stop switch with integrated half-throttle lock (DSH 700-X OR DSH 900-X)
• 21. Primer bulb
• 22. Water connection
• 23. Grip for guard adjustment
• 24. Blade rotation direction (arrow in front part of guard)
• 25. Saw arm
• 26. Hole for locking pin for changing cutting discs
• 27. Pump cover
• 28. Air filter cover

Saw trolley (accessory)

Illustration: Overview of the saw trolley accessory with numbered components.

• 1. Grip
• 2. Throttle trigger
• 3. Cutting depth adjustment
• 4. Hold-down device
• 5. Water tank
• 6. Water connection
• 7. Axial adjustment
• 8. Throttle cable
• 9. Machine cradle

Intended Use

The product is a gasoline-powered cut-off saw for wet or dry cutting of asphalt, mineral construction materials, or metals using diamond cutting discs or abrasive cutting discs. It can be held and guided by hand or mounted on a saw trolley. The saw is not suitable for use in environments where there is risk of fire or explosion.

Recommendations for Use

• Use of the wet cutting method is preferable to reduce dust.
• Use the self-priming water pump (accessory) to work without a water supply pipe; water can be drawn from a container.
• Do not cut through the workpiece in one pass; move the saw back and forth until the desired depth is reached.
• To avoid damaging the diamond cutting disc during dry cutting, lift the disc out of the cut for approx. 10 seconds every 30 to 60 seconds while the product is running.
• Resharpen polished diamond segments by cutting with the disc in a very abrasive material such as sandstone.
• For extensive floor sawing applications, mount the saw on the trolley (accessory).

Cutting Disc Specifications

Diamond cutting discs in accordance with ANSI B7.1 are to be used. Synthetic resin-bonded, fiber-reinforced cutting discs in accordance with ANSI B7.1 may also be used for working on metals. Observe the disc mounting and use instructions from the manufacturer.

Items Supplied

Gasoline-powered saw, DSH tool set, DSH consumables set (only with DSH 700-X/900-X), operating instructions.

Other system products approved for your product can be found at your local Hilti Center or online at: www.hilti.com

Consumables and Wearing Parts

• Air filter
• Cord (5 pcs)
• Starter
• Fuel filter
• Spark plug
• Tool set
• Cylinder set
• Mounting screw assy.
• Flange (2)
• Centering ring 20 mm / 1"

Technical Data

Gasoline-powered cut-off saw

Additional Technical Data

Before Use

Fuel

The two-stroke engine runs on a mixture of gasoline and oil. The quality of the fuel mixture decisively influences the running and life expectancy of the engine.

DANGER: Risk of fire and explosion. Gasoline vapors are highly flammable.

• Never smoke while refueling.
• Do not refuel the product at the area where you are working (move at least 3 meters (10 feet) away from the working area).
• Do not refuel the product while the engine is running. Wait until the engine has cooled down.
• Make sure there are no naked flames or sparks that could ignite the gasoline vapors.
• Take care to avoid fuel spillage. If fuel is spilled, clean up the areas affected immediately.
• Check to ensure there is no leakage from the fuel tank.

CAUTION: Risk of injury. Inhalation of gasoline vapors and skin contact with gasoline may be hazardous to health.

• Avoid direct skin contact with gasoline. Wear protective gloves.
• If your clothing becomes soiled with gasoline, change it immediately.
• Ensure the workplace is well-ventilated to avoid breathing in gasoline fumes.
• Use a fuel container that complies with applicable regulations.

Note: Alkylate gasoline may require engine settings readjustment by Hilti Service, or increase oil content to 4% (1:25).

Using Two-Stroke Oil

Use good-quality, two-stroke oil for air-cooled engines that meets at least the API-TC specification.

Gasoline

Use regular or super gasoline with an octane rating of at least 89 ROZ.

Note: The alcohol content (e.g., ethanol, methanol) of the fuel must not exceed 10%, otherwise engine life expectancy will be greatly reduced.

Mixing Fuel

Note: The engine will suffer damage if run with fuel mixed in the wrong ratio or with unsuitable oil.

Use a mixing ratio of 1:50 (1 part two-stroke oil to 50 parts gasoline). For example, 100 ml oil and 5 liters of gasoline.

1. Pour the required quantity of two-stroke oil into the fuel canister.
2. Fill the gasoline into the fuel canister.
3. Close the fuel canister.
4. Mix the fuel by shaking the fuel container.

Note: If the quality of the two-stroke oil or gasoline is unknown, increase the mixing ratio to 1:25.

Filling the Fuel Tank

1. Mix the fuel (two-stroke oil / gasoline mixture) by shaking the fuel container.
2. Place the product in a steady upright position.
3. Open the fuel tank by turning the cap counterclockwise and removing it.
4. Fill the tank slowly using a funnel.
5. Close the fuel tank by fitting the cap and turning it clockwise.
6. Close the fuel canister.

Assembly and Adjustment

WARNING: Risk of injury. Contact with the rotating cutting disc or hot parts can cause injury or burns.

• Before fitting or adjusting any parts, ensure the engine is switched off, the cutting disc has completely stopped rotating, and the product has cooled down.
• Wear protective gloves.

Fitting a Cutting Disc

CAUTION: Risk of injury and damage. Damaged cutting discs may break.

• Never use cutting discs that are damaged, run untrue, or vibrate.
• Do not use synthetic resin-bonded fiber-reinforced cutting discs that have exceeded their use-by date or softened due to water absorption.

CAUTION: Risk of injury and damage. Cutting discs or fastening parts that don't fit correctly can cause irreparable damage or loss of control.

• Use only cutting discs with a rated maximum permissible speed at least as high as the maximum speed stated on the product. The cutting discs, flanges, and screws must fit the product.
• Use only cutting discs with an arbor size (mounting hole diameter) of 20 mm or 25.4 mm (1").

Steps for fitting a cutting disc:

1. Insert the locking pin into the hole in the drive belt cover and turn the cutting disc until the locking pin engages.
2. Release the securing screw by turning it counterclockwise with the wrench and remove the screw and washer.
3. Remove the locking pin.
4. Remove the clamping flange and the cutting disc.
5. Check that the mounting bore of the cutting disc corresponds with the centering collar of the cutting disc mounting flange.

Note: The mounting flange has a 20 mm centering collar on one side and a 25.4 mm (1") collar on the opposite side.

6. Clean the clamping and centering surfaces on the product and cutting disc.
7. Place the cutting disc with centering collar on the drive arbor and check that the direction of rotation is correct. The direction-of-rotation arrow on the disc must match the product's indicated direction.
8. Place the clamping flange and washer on the drive arbor and tighten the securing screw clockwise.
9. Insert the locking pin into the locking hole in the drive belt cover and turn the cutting disc until the locking pin engages.
10. Tighten the clamping screw securely (tightening torque: 25 Nm).
11. Remove the locking pin.

Note: After fitting a new cutting disc, allow the product to run at full speed under no load for approx. 1 minute.

Adjusting the Guard

DANGER: Risk of injury. Flying fragments or sparks could cause injury.

• Adjust the guard so that flying particles, fragments, and sparks are directed away from the operator and the product.
• Hold the guard by the grip and rotate it to the desired position.

Conversion from Normal Cutting to Flush Cutting

Note: The front section of the saw arm can be converted to allow flush cuts (e.g., close to edges and walls). If you wish to use this feature, have the product converted by Hilti Service.

Locking Rotary Movement of the Guide Wheels

WARNING: Risk of injury. The saw could move inadvertently or fall down.

• When working on roofs, scaffolds, or sloping ground, take steps to prevent rotation of the guide wheels when the saw is not in use.
• Release the guide wheel mounting screws and remove the guide wheels.
• Reverse the guide wheels (turn 180°) and refit the mounting screws. The integrated locking function is now active.
• Check that the guide wheels are securely fastened.

Mounting the Gasoline-Powered Saw on the Saw Trolley (Accessory)

1. Remove the water tank from the saw trolley.
2. Move the cutting depth adjustment lever to the upper position.
3. Open the hold-down device by releasing the screw knob.
4. Fit the saw into the forward mount with the wheels as shown and swing the grip of the saw under the hold-down device.
5. Secure the saw by tightening the screw knob.
6. Fit the water tank after filling it.
7. Adjust the grip to a convenient working height.
8. Adjust the guard to the correct position (refer to page 10).

Note: Ensure the throttle cable is correctly adjusted. When the throttle trigger is fully pressed, the product must run up to maximum speed. If not, readjust the cable tensioner. When the throttle is not actuated, the engine must be idling, and the cutting disc must not rotate. If this is not the case, switch off the engine and adjust the throttle cable or have the idling speed adjusted by Hilti Service.

Fitting the Water Pump (Accessory)

1. Release the three pump cover retaining screws, remove the parts, and store the pump cover safely.

Note: The pump cover must be fitted if the product is used without the water pump.

2. Bring the water pump into place, rotating the cutting disc slightly until the toothing on the pump and inside the clutch housing mesh correctly. The position is keyed to prevent incorrect installation.
3. Fit the three retaining screws and tighten them securely (tightening torque: 4 Nm).
4. Connect the pump hose to the hose connector on the saw.
5. Connect the water pump to the water supply or hang the suction hose in a container filled with water.

Note: The maximum permitted water supply pressure is 6 bar.

Removing the Water Pump (Accessory)

1. Disconnect the water supply from the water pump.
2. Disconnect the connector between the pump and the product.
3. Release the three fastening screws on the pump and remove the pump.
4. Fit the pump cover on the product, insert the three retaining screws, and tighten them securely (tightening torque: 4 Nm).

Operation

Starting the Engine

DSH 700 / DSH 900

DANGER: Risk of asphyxiation. Carbon monoxide, unburned hydrocarbons, and benzene in the exhaust gas may cause asphyxiation. Don't work in closed rooms, trenches, or pits and ensure the area is well-ventilated.

WARNING: Risk of burning injury. The exhaust system gets extremely hot. Wear protective gloves and avoid touching the exhaust system. Do not lay the product down on flammable material while hot.

WARNING: Risk of injury. A damaged exhaust system increases noise level. Never use the product if the exhaust system is damaged, missing, or tampered with.

Starting Procedure:

1. Press the decompression valve (once).
2. Squeeze the primer bulb 2 to 3 times until it is completely filled with fuel.
3. Move the start/stop switch to the “start” position.
4. Alternative 1/2 (Cold engine): Pull the choke lever upwards. The choke and half throttle are engaged.
5. Alternative 2/2 (Hot engine): Pull the choke lever up and then push it back down. Half throttle is engaged, choke is not engaged.
6. Check that the cutting disc is free to rotate.
7. Position your right foot over the lower part of the rear grip.
8. Pull the starter handle slowly with your right hand until resistance is felt.
9. Pull the starter handle vigorously.
10. When the motor fires (after 2 to 5 pulls), move the choke lever back down to its original position.
11. Pull the starter handle vigorously until the engine starts.

Note: The motor will flood if the starting procedure is repeated too many times with the choke engaged.

Press the throttle trigger briefly as soon as the engine starts to disengage the half-throttle position. The engine will then run at idling speed when the throttle is released.

DSH 700-X / DSH 900-X

Starting Procedure:

1. Press the decompression valve (once).
2. When starting a cold engine, squeeze the primer bulb 2 to 3 times until it is completely filled with fuel.
3. Press the throttle safety grip and keep it pressed.
4. Press the throttle trigger and keep it pressed.
5. Move the start/stop switch to the “start” position.
6. Release the throttle safety grip and throttle trigger. The half-throttle position is now activated.
7. Check that the cutting disc is free to rotate.
8. Position your right foot over the lower part 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. Repeat this action until the engine starts.
12. Press the throttle trigger briefly as soon as the engine starts to disengage the half-throttle position. The engine will then run at idling speed when the throttle is released.

Checks After Starting the Engine

1. Check that the cutting disc remains stationary when the engine is idling and comes to a complete standstill after briefly running at full speed. Readjust idling speed if the cutting disc does not stop rotating when idling. If not possible, bring the product to Hilti Service.
2. Check that the start/stop switch functions correctly. Move it to the “stop” position.

If the engine doesn't stop (DSH 700/900): Push the choke lever upwards. If it still doesn't stop, pull the spark plug connector off the spark plug and bring the product to Hilti Service.

If the engine doesn't stop (DSH 700-X/900-X): Compress the primer bulb. If it still doesn't stop, pull the spark plug connector off the spark plug and bring the product to Hilti Service.

Switching the Engine Off

WARNING: Risk of injury. A rotating cutting disc can break or shatter.

• Allow the rotating cutting disc to come to a complete standstill before laying the saw down.

1. Release the throttle trigger.
2. Move the start/stop switch to the “stop” position. The engine stops.

Cutting Techniques

To work optimally, observe the following safety instructions:

• Always hold the product and saw trolley with both hands on the grips. Keep grips dry, clean, and free from oil and grease.
• Before work, or if an obstacle was contacted, check the cutting disc and guard for damage.
• Check that no persons are present in the working area, especially in the direction of the cut. Keep others approx. 15 m away.
• Guide the product smoothly and do not apply lateral pressure to the cutting disc.
• Always bring the cutting disc into contact with the workpiece at right angles. Do not alter the line of cut by applying lateral pressure or bending the disc while cutting.
• Secure the workpiece using clamps or a vice. This allows both hands to operate the product.
• Secure the workpiece and the part to be cut off to prevent uncontrolled movement.
• When working with the saw trolley, check that the saw is mounted correctly.
• Switch the saw off immediately if the saw trolley throttle cable or throttle trigger sticks.
• Always apply full throttle when cutting.

Avoiding Stalling

CAUTION: Risk of disc breakage or kickback. Excessive pressure distorts the cutting disc. Sticking or stalling increases the probability of kickback or disc breakage.

• Avoid applying excessive pressure and do not allow the cutting disc to stick and stall.
• Do not attempt to make an excessively deep cut.
• Cutting thick workpieces should be done in several cuts. Avoid excessively deep cuts.
• Support slabs or large workpieces so that the kerf remains open during and after cutting.

Avoiding Kickback

1. Always bring the cutting disc into contact with the workpiece from above.
2. Allow the cutting disc to contact the workpiece only at a point below its rotational axis.
3. Take special care when inserting the cutting disc into an existing kerf.

Care and Maintenance

WARNING: Risk of injury. Touching the rotating cutting disc or hot parts may lead to injury or burns. Switch the engine off and allow the product to cool down before all maintenance, repairs, cleaning, or servicing.

Maintenance

Before Use

1. Check that the product is complete, not leaking, and in faultless condition. Repair if necessary.
2. Check that the product is not dirty and clean it if necessary.
3. Check that the operating controls function correctly. Have them repaired if necessary.
4. Check that the cutting disc is in faultless condition and replace it if necessary.
5. Check the tightness of all externally accessible screws and nuts and retighten them if necessary.

Every 6 Months

1. Check the tightness of all externally accessible screws and nuts and retighten them if necessary.
2. Check the fuel filter for dirt or clogging and replace it if necessary.

If Necessary

1. Check the tightness of all externally accessible screws and nuts and retighten them if necessary.
2. Change the air filter if the engine fails to start or if its performance drops noticeably.
3. Check fuel filter for dirt or clogging and replace it if necessary.
4. Clean or replace the spark plug if the product doesn't start or starts only with difficulty.
5. Readjust (reduce) the idling speed if the cutting disc doesn't stop rotating when the engine is idling.
6. Have the product repaired by Hilti Service if the drive belt slips when a load is applied to the cutting disc.

Cleaning or Replacing the Air Filter

Risk of damage. Entry of dust causes irreparable damage to the product.

• Never operate the machine if the air filter is damaged or missing.
• When changing the air filter, the product should stand upright.
• Ensure that no dust finds its way onto the underlying filter screen.

Note: Change the air filter if engine performance drops noticeably or if the engine becomes difficult to start.

Steps:

1. Release the securing screw on the air filter cover and remove the cover.
2. Carefully remove dust from the air filter and filter chamber (use a vacuum cleaner).
3. Release the four screws retaining the filter holder and remove the air filter.
4. Fit the new filter and secure it with the filter holder.
5. Fit the air filter cover and tighten the retaining screws.

Replacing a Broken Starter Cord

CAUTION: Risk of damage. The housing may suffer damage if the starter cord is too short.

• Never continue to use a broken starter cord. Replace it immediately.

Steps:

1. Unscrew the three securing screws and remove the starter assembly.
2. Remove remaining pieces of the starter cord from the spool and starter handle.
3. Make a secure knot in the end of the replacement starter cord and pass the free end through the hole in the spool from above.
4. Pass the end of the cord through the starter housing opening from below, also through the starter handle from below, and make a secure knot.
5. Pull a length of the starter cord out of the housing and pass it through the slot in the spool.
6. Hold the cord securely close to the slot and rotate the spool clockwise as far as it will go.
7. Rotate the spool back about 1½ revolutions until the slot aligns with the opening in the starter housing.
8. Hold the spool securely and pull the free end of the cord out of the housing towards the starter handle.
9. Hold the cord under tension, release the spool, and allow the starter cord to be pulled in.
10. Pull the starter cord out as far as it will go and check that the spool can be turned by hand at least a further 1½ turn clockwise. If not, reduce spring tension by one revolution counterclockwise.
11. Fit the starter assembly and press it down gently. Pull the starter cord slightly until the coupling engages and the assembly is seated.
12. Secure the starter assembly with the three retaining screws.

Replacing the Fuel Filter

Note: When refueling, ensure no dirt or foreign matter enters the fuel tank.

1. Remove the cap from the fuel tank.
2. Pull the fuel filter out of the fuel tank.
3. Check the condition of the fuel filter. Replace if very dirty or clogged.
4. Slide back the clip on the hose and remove the dirty fuel filter.
5. Fit a new fuel filter and secure it with the clip on the hose.
6. Push the fuel filter back into the fuel tank.
7. Close the fuel tank.

Cleaning the Spark Plug, Setting the Spark Plug Gap or Replacing the Spark Plug

CAUTION: Risk of injury. The spark plug and engine parts may be hot immediately after use.

• Wear protective gloves and allow the product to cool down.

1. Use a gentle twisting motion to pull the cable connector off the spark plug.
2. Use the spark plug wrench to unscrew and remove the spark plug.
3. If necessary, clean the spark plug electrode with a soft wire brush.
4. Check the spark plug gap with a feeler gauge and reset it to the correct gap (0.5 mm) if necessary.
5. Fit the ignition cable connector to the spark plug and hold the threaded section of the spark plug against the cylinder.
6. Move the start/stop switch to the “start” position.

WARNING: Risk of injury. Touching the electrodes presents a risk of electric shock. Don't touch the spark plug electrodes.

7. Pull the starter cord (press the decompression valve first). An ignition spark must be clearly visible.
8. Use the spark plug wrench to screw the spark plug into the cylinder (tightening torque: 12 Nm).
9. Fit the ignition cable connector to the spark plug.

Adjusting the Carburetor

The carburetor is factory set for optimum performance and sealed (jets H and L). The idling speed jet (T) may be adjusted by the user. All other adjustments must be carried out by Hilti Service.

Note: Tampering with carburetor settings may cause engine damage.

• Clean the air filter (refer to page 14).
• Allow the product to run until it reaches normal operating temperature.
• Use a suitable flat screwdriver (tip width 4 mm / 5/32 ") and do not force the adjusting screw beyond its intended range.
• Adjust the idling speed jet (T) so that the engine runs smoothly at idle but the cutting disc does not begin to rotate.

Care and Maintenance of the Machine

Note: Use only genuine Hilti spare parts and consumables for safe and reliable operation. Approved parts, consumables, and accessories can be found at your local Hilti Center or online at: www.hilti.com

• Keep the product, especially grip surfaces, clean and free from oil and grease.
• Do not use cleaning agents containing silicone.
• Clean outer surfaces regularly with a slightly damp cloth or dry brush. Do not use spray, steam cleaning, or running water.
• Do not allow foreign objects to enter the interior of the product.

Transport and Storage

Transportation in a Vehicle

DANGER: Risk of fire and explosion. If the product tips over during transport, fuel may run out.

• Empty the product's fuel tank completely before packing and shipping.
• Transport the product, as far as possible, in its original packaging.

WARNING: Fire hazard. Hot parts of the machine could ignite surrounding material. Allow the product to cool down completely before packing or loading into a vehicle.

1. Remove the cutting disc.
2. Secure the product to prevent it falling over, causing damage or fuel spillage.
3. Transport the saw trolley only when the water tank has been emptied.

Storing the Fuel Mixture

CAUTION: Risk of injury. Pressure may build up in the fuel tank, forcing fuel out when the cap is opened.

• Take care when opening the fuel tank cap.
• Store the fuel in a dry, well-ventilated room.
• Mix only enough fuel for a few days' use.
• Clean the fuel container occasionally.

Troubleshooting

If a problem is not listed or cannot be remedied, please contact Hilti Service.

Disposal

Most materials from which Hilti products are manufactured can be recycled. Materials must be correctly separated before recycling. Old tools, machines, or appliances can often be returned to Hilti for recycling. Ask Hilti Service or your Hilti representative for further information.

Drilling Slurry

Disposal of drilling slurry directly into rivers, lakes, or the sewerage system without suitable pretreatment presents environmental problems. Ask local public authorities for information about current regulations.

Recommended pretreatment:

• Collect the drilling slurry (e.g., using a wet-type vacuum cleaner).
• Allow the drilling slurry to settle and dispose of the solid material at a construction waste disposal site.
• Neutralize the remaining water (alkaline, pH value > 7) with an acidic neutralizing agent or dilute it with a large volume of water before allowing it to flow into the sewerage system.

Manufacturer's Warranty

Please contact your local Hilti representative if you have questions about the warranty conditions.