Blastrac BMC-335EHY User manual

Original instructions in English
OPERATING INSTRUCTIONS
BMC-335EHY/GHY
VERSION 2.9

2
Inspection comments
Recurring inspections / maintenance log
*Competent person
Date / Hour counter
Findings
Repairs / Cleaning
Test
on
By*
Inspection before initial operation on: __________________________________________
By: __________________________________________
Date of initial operation: __________________________________________
Serial number & Year of manufacture: __________________________ _____________

3
Table of contents
Inspection comments 2
1. Introduction 4
2. Machine description 4
Accessories 5
3. Safety 6
3.1 Work area safety 6
3.2 Personal safety 6
3.3 Machine safety 7
3.4 Electrical safety 7
3.5 Diesel motor safety 8
3.6 Hydraulic safety 8
3.7 Dust collector safety 10
3.8 Maintenance safety 10
3.9 Transport safety 10
3.10 Signs on the machine 12
4. Initial operation 13
4.1 Checkpoints of electrical safety (EHY-version) 13
4.2 Checkpoints of diesel engine safety (GHY-version) 13
4.3 Manual moving of the machine 14
4.4 Mounting the diamond blades 15
4.5 Removing the diamond blades 17
4.6 Control device BMC-335EHY 17
4.7 Control device BMC-335GHY 19
5. Operating 21
5.1 Before starting up 21
5.2 Starting up the machine (EHY-version) 21
Starting up the machine (GHY-version) 22
5.3 Operating during sawing 23
5.4 Switch off the machine (EHY-version) 24
Switch off the machine (GHY-version) 24
5.5 Refueling the engine 27
5.6 Fuel type 27
5.7 Checking and refilling the engine oil 28
6. Maintenance 31
6.1 Maintenance of the bearings 32
6.2 Lubrication 33
6.3 The belt drive 34
6.4 Rebuild to scarifier 35
6.5 Diesel engine maintenance 36
7. Troubleshooting 38
8. Technical data 40
Contact

4
1. Introduction
Before use, operators must be provided with information, instruction and training for the use of the machine
and the substances for which it is to be used, including the safe method of removal and disposal of the
material collected. All persons who are working with or maintaining this machine must read the manual
carefully and understand it fully. In case you sell the unit, hand it on to the next owner.
Keep this manual always with the machine, to enable it to be referred to at any time.
Any other work not covered by this operating manual must not be carried out. Always use common sense
when working with machines.
This machine is designed for industrial use by professionals. Only authorized and trained personnel may
operate this machine. This machine is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge. Blastrac BV offers a course on
the use of the machine in order to make the operating and maintenance personnel familiar with all elements of
the machine.
Always read the enclosed OWNER’S MANUAL of the Hatz diesel engine before operating the
machine.
The OWNER’S MANUAL contains important information about getting the best performance and safe operation
/ maintenance of the diesel engine.
The OWNER’S MANUAL should be considered a permanent part of the engine and should remain with the
engine if resold.
2. Machine description
The Blastrac multisaw machine BMC-335 can be supplied with a 400 Volt electric motor (EHY) or with a
combustion engine (GHY), where you can mount a different quantity of saw blades underneath. By changing
the pulleys and the belt, the machine can also be used as a scarifier. The manufacturer will not be liable for
damage resulting from incorrect usage, in these cases the user assumes all risks.
The machine is sealed around which makes the use almost dust free when connected to an appropriate
Blastrac dust collector. Due to the fine adjustment and the possibility to lock the height adjustment, the depth
of cutting can be set very precisely, and the same saw depth can be maintained.
Intended use:
The multisaw machine is extremely suitable for removing hard top layers from soft floors or to remove the top
layer from “floating” floors and/or “computer” floors.
Sawing is a very fast process. Ideal for removing several millimeters from a concrete floor preparing it to be
polished up to the stones without using an extra scarifier.
The BMC-335 can be used during sawing in the forward or backward driving direction.
Driving in reverse direction while sawing will give a more uniform surface.
Driving in forward direction while sawing will allow more speed since it is less hard for the motor.
NEVER use the BMC-335 as a scarifier without the proper modifications.
The machine must first be converted into a BMP-335.
This is possible by changing the belt and the pulleys. (See chapter 6.4)
If the multisaw machine is converted to a scarifier, it can be used, with the appropriate cutters, for the
following applications;
To roughen concrete
To clean most horizontal surfaces
To remove coatings
To corrugate concrete surfaces
To remove road markings
To make non-slip surfaces
The force of impact of a cutter is controlled by the depth adjustment. With the right depth adjustment, the
best performance is obtained to give a desired result.

5
With a suitable Blastrac dust collector work can be carried out without causing excessive dust in the work area,
this raises the life span of the machine and protects the health of the personnel.
For the GHY version (Diesel engine)
Please read the enclosed OPERATOR’S MANUAL of the diesel engine before operating the machine.
The OPERATOR’S MANUAL contains important information about getting the best performance and safe
operation of the diesel engine.
The OPERATOR’S MANUAL should be considered a permanent part of the engine and should remain with the
engine if resold.
BMC-335 EHY
BMC-335 GHY
1
Treadle of drive system
Treadle of drive system
2
Dust collector connection
Dust collector connection
3
Quick lift lever
Quick lift lever
4
Handwheel working depth
Handwheel working depth
5
Lifting eye
Lifting eye
6
Dead man switch
Driving lever
7
Driving lever
Air filter
8
Electrical panel
Hydraulic pump housing
9
Hydraulic pump housing
Diesel motor
10
11
1
M10 lock nut
2
Spacer ring
3
Diamond blade green 30/40
Diamond blade blue 30/40
Diamond blade red 30/40
4
Drum for diamond blades
5
M8x30 hexagon socket head cap

6
3. Safety
Warning!
Read all safety warnings and all instructions. Failure to follow the warnings and
instructions may result in electric shock, fire, explosions and / or serious injuries.
Only authorized and trained personnel may operate this machine. This machine is not intended for use by
persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and
knowledge.
It is the responsibility of the user to analyse the surface to be treated. The surface may not contain any
substances which could pose a fire-, explosion- or health risk when treated. The user should make a risk
assessment on the basis of the information obtained about the surface to be treated and take proper
precautions for the work to be performed.
In case of any inappropriate usage, improper operation or repair, the producer shall be exempt from liability.
3.1 Work area safety
a) Do not use the machine in rain, damp or wet locations.
b) Avoid dangerous environments: do not work in the presence of explosive atmospheres, in the presence of
flammable liquids, gases or dust. Remove materials or debris that may be ignited by sparks.
c) In some cases sparks could be created by sawing, scarifying or milling.
d) The surface to be treated must be clean, make sure to remove all stones, screws etc..
e) Do not use on wood.
f) Make sure there is enough ambient light on the work area. Cluttered or dark areas invite accidents.
g) Keep children and bystanders away while operating the machine. They are likely not to foresee the
potential dangers of the machine. Distractions could cause you to lose control of the machine.
h) Persons who are not operating the machine must not be permitted to stay in the surrounding area of at
least 5 meter from the machine.
i) Never use the machine when the surface is not clear and if there is a risk of stumbling or tripping.
j) Remove electrical cables and dust hose(s) from the surface to be treated.
k) Make sure that there are no cables or hoses in the driving direction of the machine.
l) Make sure that there is nothing standing or situated on the surface to be treated.
m) Make sure the machine can travel over all inequalities on the surface, small inequalities like weld seams or
(floor) joints are no barriers for the machine.
n) Never stay in the rain with the machine.
o) Check if there are any obstacles that can snag the cables when the machine is moving.
p) Remove all objects from the surface that can damage the machine. Remove reinforcing steel or other
objects protruding from the surface in order to prevent damage to the machine.
q) Warning! Make sure that the surface to be treated does not contain dangerous materials such
as: - combustible or explosive dusts or substances.
- carcinogenic or pathogenic substances.
r) It is necessary to provide for an adequate air change rate L in the room if the exhaust air from the dust
collector is returned to the room. Comply with the National regulations.
s) Secure the work area around the machine in public areas providing an adequate safety distance from the
machine. Use a red and white safety chain and danger sign to enclose the work area.
t) Danger to life from inhaling exhaust gases. Toxic engine exhaust gases can lead to loss of consciousness
and even death in closed-off and poorly ventilated rooms.
▪ Never operate the machine in closed-off or poorly ventilated rooms.
▪ Do not breathe in the exhaust gases.
u) Only work on locations which are adequately ventilated.
3.2 Personal safety
a) Always wear Personal Protective Equipment while working with the machine.
-Dust mask class FFP3 or higher
-Ear protection
-Safety glasses with lateral protection
-Protecting gloves
-Safety shoes

7
b) Dress properly. Do not wear loose clothing or jewellery. Keep your hair, clothing and gloves away from
moving parts.
c) Personnel must tie back long hair and not wear loose clothing or jewellery including rings.
d) Stay alert, watch what you are doing and use common sense when operating the machine.
e) Always seek professional medical attention immediately in case of injury.
f) All persons surrounding the machine should wear Personal Protective Equipment.
3.3 Machine safety general
a) Safety functions and operating functions must work correct.
b) No loose bolts and nuts permitted.
c) Never operate machine without the guards and/or safety devices in place.
d) Never change anything on the safety devices on the machine!
e) Do not use the machine when it is damaged.
f) Do not open or remove protective guards while driving gears are running.
g) The temperature of the machine can be above 37° C.
h) The machine, specially the handle grips and control devices must be dry and free of fats/oils.
i) All repair work has to be done by qualified Blastrac personnel, this guarantees a safe and reliable
machine.
j) Always use original Blastrac spare parts, sawing blades and cutters. This will ensure the best
performance. Only original parts meet the factory specifications and quality. Otherwise Blastrac BV
cannot guarantee the safety of the machine. The part numbers can be found in the Service Manual.
k) Check the rotating direction of the motor before operation. The correct direction is given with an arrow on
the housing of the motor.
l) Make sure the drum with blades is in good condition.
m) In some cases sparks could be created by sawing, milling or scarifying.
n) If safety-critical changes occur to the machine or its working method, the machine must be shut down
immediately! The cause of the fault must be established, and rectified.
o) In the event of operational malfunctions the machine must be shut down immediately and secured!
p) Never use the machine without a suitable (Blastrac) dust collector!
3.4 Electrical safety
a) Use only extension cables for extending the main cable that are sized and marked in accordance with the
overall power consumption of the machine. Do not use damaged extension cables.
b) Electrical cables must be rolled entirely off of the reels.
c) Any damage to the electric cables and/or electrical components is not permitted.
d) If the power supply cable or plug is damaged, it must be replaced immediately. Only use original Blastrac
parts.
e) The voltage on the identification plate must comply with the power supply.
f) Use an electrical power supply connection with earth connection and earth leakage circuit breaker.
g) The circuit breaker of the power supply must have a ‘’D’’ characteristic. Circuit breakers with a “C” or “B”
characteristic can give problems when switching the machine on.
h) Keep the machine original; The machine is always equipped with an earthed connection, do not
change this and always use earthed cables with an earthed plug.
i) Inspect and test the electrical components regularly. The electrical components have to satisfy with the
requirements set out in the harmonised norm EN60204-1.
j) Always call a skilled electrician or your distributor when you have questions about the safety of the
electrical components.
k) Work on electrical equipment or operating materials may only be undertaken by a skilled electrician or by
trained persons under the guidance and supervision of a skilled electrician as well as in accordance with
the electrical engineering regulations.
l) Always use tools that are insulated against voltages.
m) Do not abuse the cables. Never use the cables for carrying, pulling or unplugging the machine. Keep
cables away from heat, oil, sharp edges or moving parts. Damaged or entangled cables increase the risk
of electric shock. Do not fold the cable or clamp it.
n) Don’t pull out the power supply cable out by the wire, but by the connector.

8
o) Be careful with water on the treated surface. Electrical cables must not come into contact with water.
p) During a long standstill of the machine, pull out the main plug.
q) If the machine is to be operated using power from a generator, the generator must be operated in
accordance with the current legal regulations and directives in force. (this applies to the protective earth
conductor in particular) in order to ensure that all safety devices are functioning and to eliminate possible
damage to electrical components.
3.5 Diesel version safety
a) Read the enclosed Operating Instructions of the diesel engine before using it.
b) Make sure there is no oil or diesel leaking out of the diesel engine.
c) Always make a pre-operation inspection before you start the engine. You may prevent an accident or
equipment damage.
d) Look for signs of damage and remove any excessive dirt or debris.
e) To prevent fire hazards and to provide adequate ventilation, keep the engine at least 1 meter
(3 feet) away from buildings and other equipment during operation.
Do not place flammable objects close to the engine.
f) Anyone who is not operating this machine must be kept away from the area of operation due to a
possibility of burns from hot engine components. Parts will remain hot for a while after stopping the
engine. Let the engine cool before transporting it or storing it indoors.
g) When transporting or storing the engine, turn the fuel valve OFF and keep the engine horizontal.
h) Know how to stop the engine quickly, and understand the operation of all controls. Never permit anyone
to operate the engine without proper instructions.
i) Do not place flammable objects such as gasoline, matches, etc., close to the engine while it is running. Do
not place anything on the engine.
j) Refuel in a well-ventilated area with the engine turned OFF. Gasoline / diesel is highly flammable and
explosive under certain conditions. Let the engine cool before refueling.
k) Do not overfill the fuel tank. There should be no fuel in the filler neck.
l) Do not smoke or allow flames or sparks where the engine is refueled or where gasoline / diesel is stored.
m) ! Exhaust gas contains poisonous carbon monoxide ! Avoid inhalation of exhaust gases. Never run
the engine in a closed garage or confined area! Always wear a dust mask.
Breathing carbon monoxide can cause unconsciousness or death.
n) If any fuel is spilled, clean it up completely and allow petroleum vapours to dissipate before starting the
engine.
o) Make sure the fuel and oil level are correct and that the filler cap is closed securely.
p) Don’t leave the machine laying backwards for a long time, because this may result in fuel spillage.
q) Comply with all notices and warning labels on the engine and keep them in a legible condition. If a label
should become detached or difficult to read, it must be replaced promptly. For this purpose, contact your
nearest HATZ service station.
r) Any improper modification of the engine will result in a loss of liability coverage for resulting damage.
s) Only regular maintenance, as specified in the Hatz manual, will maintain the operating readiness of the
engine.
t) Disconnect the negative battery terminal before carrying out maintenance work.
3.6 Hydraulic safety
a) Make sure all hydraulic hose connections are tightened and there is no leakage of oil.
b) Over tightening could damage O-rings. If a leak still persists, remove fitting and replace O-ring.
c) Make sure the hydraulic hoses have no damages, signs of wear or other defects.
d) Hydraulic fluid under pressure is dangerous and can cause serious injury.
e) Never look for a leak when the unit is under pressure.
f) Avoid leaks by keeping fittings and hoses tight, only check and service when not under pressure.
g) Leaking hydraulic fluid is not only unsightly, it’s dangerous. It could make workplace floors slippery,
contaminate the environment and could create a possible fire/explosion hazard.
h) Never change the oil pressure of the machine! Changing the oil pressure could cause serious damage to
the machine and could result in very dangerous situations!
i) Only work with the hydraulic oil in an area that is well-ventilated, otherwise you must wear suitable
respiratory protection. Always wear Personal Protective Equipment when handling the oil:
-Protecting gloves (preferably made of nitrile or neoprene.)
-Safety goggles.
-Hydrocarbon-proof clothing and safety shoes.
j) Avoid long and repeated contact with the skin, after contact wash thoroughly with water and soap.

9
Contact with eyes: Immediately flush eyes with cold, fresh water for a minimum of 15 minutes. Seek
professional medical attention.
k) Do not eat, drink or smoke near the hydraulic oil.
l) HV46 hydraulic oil holds no danger of intoxication.
m) The hydraulic oil is stable at normal temperatures for storage, handling and use. However, the hydraulic
oil is flammable when exposed to certain conditions. Empty containers may contain flammable or
explosive vapors. Rags that are soaked with the product and paper or materials which have been used for
absorbing the spilled product are inflammable. Make sure that no accumulation occurs. Remove safely
after use.
n) Avoid sparks, open flames, extremely high temperatures and other sources of ignition.
o) Please read the Safety Data Sheets for additional information regarding the hydraulic oil.
p) Only use HV46 hydraulic oil (E00481), non-compatible fluids could cause damage to the unit or serious
injury.
q) At least one time during year oil from system and the filter should be replaced.
r) Work on hydraulic equipment or operating materials may only be undertaken by a skilled hydraulic
engineer or by trained persons under the guidance and supervision of a skilled hydraulic engineer as well
as in accordance with the hydraulic engineering regulations.
s) Hoses and pipe work can be under high (hydraulic) pressure. The temperature can be above 37° C. Use
only hoses and pipe work that are sized and marked in accordance with the overall power consumption of
the machine.
t) A second person must be deployed who can disengage the hydraulics in an emergency if work on live
parts is necessary. The work area must sealed off using a red and white safety chain and a danger sign.
For the electrical parts, use a tool that is insulated against voltages.

10
3.7 Dust collector safety
a) Always use a Blastrac dust collector to ensure a dust-free operation of the machine and clean air at
the workspace. Also the airflow helps to cool the machine and prevents overheating.
b) Read the operating instructions of the dust collector before using it.
c) The dust container/bag of the dust collector must be emptied regularly. Comply with the local
waste treatment regulations considering the removed material.
d) The dust hose must be connected properly with a hose clamp and industrial tape.
e) The dust hose must be undamaged and free of obstructions.
f) Always switch on the dust collector first!
3.8 Maintenance safety
a) Pull out the main plug and place it in sight, before changing the drum or starting inspections and repairing
on the machine. Pull out the key of the dead man’s switch and keep it in your pocket.
b) Wait for a standstill of all drives before any inspections, adjustments and/or maintenance work is started.
c) Block the machine in a stable position before doing any maintenance work.
d) Failures due to inadequate or incorrect maintenance may generate very high repair costs and long
standstill periods of the machine. Regular maintenance therefore is imperative.
e) Operational safety and service life of the machine depends, among other things, on proper maintenance.
f) Prevent premature wear by keeping the machine as dust free as possible. Clean the machine for this
reason regularly with a dust collector and non-aggressive materials. Never use a high pressure water
cleaner to clean the machine.
g) Do not use any aggressive cleaning materials!
h) Use lint-free cleaning cloths!
i) It is advisable to stock all spare parts or wear parts that cannot be supplied quickly. As a rule, production
standstill periods are more expensive than the cost for the corresponding spare part.
j) The suitable precautions include decontamination before disassembling the machine, adequate filtered
ventilation of the exhaust air from the room in which it is disassembled, cleaning of the maintenance area
and suitable personal protection equipment.
k) Always read the enclosed OWNER’S MANUAL of the Hatz diesel engine before operating the machine.
l) The OWNER’S MANUAL contains important information about getting the best performance and safe
operation / maintenance of the diesel engine.
m) The OWNER’S MANUAL should be considered a permanent part of the engine and should remain with the
engine if resold.
3.9 Transport safety
a) Be aware of your surroundings and machine operating level. Do not side hill, do not run on steep incline,
this could cause machine to tip over.
b) The weight of the BMC-335EHY is 405 kilogram without diamond blades. The weight of the BMC-335GHY
is 359 kilogram without diamond blades. Use a crane or lift when transporting the machine, use the lifting
eyes on the machine.
c) Before every use check the lifting eyes and welds for: deformation, damages, cracks, corrosion and wear.
d) When lifting the machine from the ground, always use the lowest lifting speed. The cables must first be
tensioned at this speed; they must not be slack when the machine is lifted from the ground.
e) During hoisting make sure to be at a safe distance from the machine with the most optimal view on the
machine and working environment.
f) Never stand directly below the machine.
g) When transporting the machine do so in such a manner that damage due to the effects of the use of force
or incorrect loading and unloading is avoided.
h) The lifting eyes can also be used to fasten the machine on a pallet or during transport.
i) Always drive backwards when driving up to a ramp or grade, and forwards when driving of the ramp.
j) Chock wheels for transport and keep the treadle in engaged position, this will function as a brake on the
wheels.
k) Don’t leave the machine unsecured on jobsites.
l) Park the machine always on a flat horizontal and levelled surface.
m) Remove the dirt, dust and debris from the machine before transport.
n) Make sure the electrical cable and dust hose are disconnected before transport.
o) Store the cleaned and dry machine in a humid free room. Protect the motor from moisture, heat dust and
shocks.

11
p) Never use the machine for lifting persons or items.
q) It is possible to transport the machine without the use of the motor by pushing up the treadle (pos. 11,
page 5). The drive wheels are declutched of the drive motors now. Make sure that the floor is flat,
because the machine is uncontrolled now! It is very dangerous to drive the machine on a grade or
ramp when the treadle is in upwards position! Never load or unload the machine on a ramp or
incline when the wheels are in the disengage mode. Failure to do so could cause machine to run away,
damage to the machine, damage to property or cause serious injury.
r) Only lift the machine as shown in the picture below. Use the existing lifting points to lift the machine.
NEVER use the BMC-335 as a scarifier without the proper modifications!
The machine must first be converted into a BMP-335.
This is possible by changing the belt and the pulleys. (See chapter 6.4)

12
3.10 Signs on the machine
The following stickers are placed on the machine. Meanings of these symbols are:
Type plate:
EU Declaration of Conformity:
! Danger Hazardous voltage in motor
even when solid state controller is OFF.
Disconnect main power before servicing
motor, controller or associated wiring.
Warning! Hot surface.
DANGER Rotating parts inside.
Keep hands clear.
Lock-out / shut down before servicing.
Wear a dust mask class FFP3
or higher.
Hearing protection is obliged.
Safety glasses with lateral
protection are obliged.
CE-mark on this machine.
Wear protecting gloves.
Safety shoes obliged.
Consult the manual before
operating the machine.
Name, address and CE mark.
The machine type.
The net weight of the machine in kilogram.
The year of manufacture.
The serial number of the machine.
Email address, Website, Telephone & fax number.

13
4. Initial operation
Before using the machine it is of great importance to inspect the machine.
It is not permitted to use the machine if the machine safety is not according the checkpoints below.
4.1 Checkpoints of electrical safety (EHY-version)
Use only extension cables for extending the main cable that are sized and marked in accordance with
the overall power consumption of the machine.
Electrical cables must be fully unwind of their reels.
No damage is permitted for electrical cables.
Use an electrical power supply connection with earth connecting.
Make sure the power supply is in accordance with the machine specifications.
The circuit breaker of the power supply must have a ‘’D’’ characteristic. Circuit breakers with a “C” or
“B” characteristic can give problems when switching the machine on.
If the machine is to be operated using power from a generator, the generator must be operated in
accordance with the current legal regulations and directives in force. (this applies to the protective
earth conductor in particular) in order to ensure that all safety devices are functioning and to eliminate
possible damage to electrical components.
Checkpoints of diesel engine safety (GHY-version)
Make sure the location is adequately ventilated.
Make sure there is a sufficient amount of fuel in the fuel tank.
Make sure there is a sufficient amount of engine oil in the engine.
Make sure no persons are located in the danger zone of the engine or machine.
All safety equipment is in place.
4.2 Checkpoints of the machine
Safety functions and operating functions must work correct.
Check all screws and other fasteners for tightness. No loose bolts and/or nuts are permitted.
Check the electrical components, cables and connections for wear and/or damages.
Check the hydraulic components on the machine for damages and wear.
Dust hose connections must be reliable: use hose clamps and industrial tape.
Dust hose must be undamaged and free of obstructions.
Check the tension of the belt after a drum is placed in the machine.
Make sure the drum and the diamond blades are in good condition.
Make sure the drum is assembled as shown in the service manual.
Check if the motor turns in the right direction and if the turning direction of the diamond blades is the
same as the motors turning direction.
Turning direction of the axle
Turning direction of the
diamond blades

14
Work area
Check the surface to be treated for loose parts (stones, screws, etc.) The surface must be swept if
necessary. Make sure the machine can travel over all inequalities on the surface. Small inequalities like
weld seams or floor joints are no barriers for the machine.
Secure the work area around the machine providing an adequate safety distance from the machine.
Use a red and white safety chain and danger sign to enclose the work area.
Remove reinforcing steel or other objects protruding from the surface in order to prevent damage to
the machine.
Warning! Make sure that the surface to be treated does not contain dangerous materials
such as: - combustible or explosive dusts or substances.
- carcinogenic or pathogenic substances.
4.3 Manual moving of the machine
To move the machine manually push the treadle up with your foot. The wheels are now disengaged from the
drive motors. The machine can now be pushed around on its wheels.
Make sure that the floor is flat, because the machine is uncontrolled now! It is very dangerous to drive the
machine on a grade or ramp when the treadle is in upwards position! Never load or unload the
machine on a ramp or incline when the wheels are in the disengage mode. Failure to do so could cause
machine to run away, damage to the machine, damage to property or cause serious injury.
Push the treadle down when parking the machine, engaging the wheels to the drive system will act like a
parking brake when the machine is turned off.
The machine should only be moved around when the dust hose, and power supply cable are disconnected.
WARNING! Always make sure all rotating parts have come to a complete standstill before moving the
machine around.
Be careful! Make sure nobodies feet get under the wheels. Wear appropriate safety shoes when you drive the
machine to or from the work area.
Make sure that no vehicles, such as forklift trucks and other equipment run over the electric cable and the dust
hose.

15
4.4 Mounting the diamond blades
Make sure all moving parts of the machine have come to a complete standstill before mounting the blades.
-Pull out the main plug of the machine.
-Pull out the key of the deadman’s switch and put it in your pocket.
Warning!
Always wear Personal Protective Equipment!
The dust can be hazardous to the health!
ALWAYS wear a dust mask!
ALWAYS wear protective gloves during mounting or
dismounting the blades!
A. Loosen the 4 bolts of the side plate
B. Remove the side plate (2)
Slide the hexagon clamp bush with the stud bolts (1) over the hexagon axle until it is about 3mm from
the end of the axle. Tighten both bolts (2) very tight, It is advisable to use a locking solution such as
Loctite 243 on these bolts.
A B

16
Assemble the spacer rings (3) and diamond blades (4) one by one over the axle until the end of the drum.
There has to be at least one spacer ring between the diamond blades.
NOTE:
80 sawing blades is always the maximum allowed amount of blades on the drum for EHY
54 sawing blades is always the maximum allowed amount of blades on the drum for GHY
BMC-335 EHY
BMC-335 GHY
Width of
sawing
[mm]
Qty. of
blades
Qty. of
Spacer ring
2.5mm
Qty. of
blades
Qty. of
Spacer ring
2.5mm
340
80
85
54
103
300
71
92
54
103
250
59
100
54
103
200
47
108
47
108
150
35
116
35
116
100
24
125
24
125
50
12
133
12
133
For a finer sawing result:
Replace the normal standard Spacer ring 2.5mm (E06079) by Spacer ring 1.0mm (E07497).
For a coarser sawing result:
Replace the normal standard Spacer rings 2.5mm (E06079) by Spacer ring 3.0mm (E07549).
Clamp all diamond blades and spacer rings together by turning 2 lock nuts (5) at the end of the tap ends
(6). Make sure that there are at least 2 spacer rings at the end of the drum.
Mount the side plate. A side plate which is incorrectly mounted or mounted
with force will shorten the lifetime of the drum bearings.
Always check the belt tension after mounting a drum (see chapter 6.3)
Never use the machine without a side plate or with an incorrect mounted side plate!

17
4.5 Removing the diamond blades
Pull out the main plug and the key of the deadman’s switch. (EHY-version)
Push the control lever all the way to the "Stop" position. (GHY-version)
Loosen the bolts of the side plate and remove the side plate (7)
Loosen the lock nuts (5) and remove the spacer rings and diamond blades.
Turn both bolts (2) loose and remove the hexagon clamp bush (1).
4.6 Control device BMC-335 EHY
BMC-335 EHY
1
Treadle of drive system
2
Dust collector connection
3
Quick lift lever
4
Handwheel working depth
5
Lifting eye
6
Dead man switch
7
Driving lever
8
Electrical panel
9
Hydraulic pump housing
10
“Sawing - scarify motor” ON/OFF buttons
11
Control light “Phase incorrect”
12
“Hydraulic pump motor” ON/OFF buttons
13
Emergency shutdown button
14
Hour counter
15
Ampere meter
16
Plug for power supply
10
11
12
13
14
15
16

18
1. Treadle of drive system
It is possible to transport the machine without the use of the motor by pushing up the treadle (1). The
drive wheels are declutched of the drive motors now. In the downward position the wheels are
engaged to the drive motors. Make sure that the floor is flat, because the machine is uncontrolled now!
It is very dangerous to drive the machine on a grade or ramp when the treadle is in upwards
position!
2. Dust hose connection
The dust hose to the dust collector must be connected here. Use hose clamps and industrial tape for a
reliable connection.
3. Quick lift lever
In the upright position the drum is lifted off of the ground, in the downwards position, the drum is put
on the ground. The quick lift lever enables the operator to lift the complete drum without changing the
fine adjustment of the working depth. The lever must be in the upright position before start-up, in
order to prevent a run out of the motor under full load.
4. Fine adjustment
The working depth can be adjusted by turning the fine adjustment wheel. The sawing depth must be
adjusted considering the surface to be treated. The progressively depth adjustment enables the sawing
blades to saw into the surface being treated only at the required and necessary depth. When the depth
adjustment is correctly selected, the machine will run quiet and constant.
6. Dead man’s switch
The key of the dead man’s switch is attached to a cord. The cord should be fastened on the arm of the
operator. When the key is pulled out, the machine will stop immediately.
7. Driving lever
The drive unit control lever is used to control the machine’s drive unit. The function of the drive unit
control lever begins after adjusting the working depth of the machine with the quick lift. You should
pay attention that the drive unit control lever is locked in the neutral position before manipulating the
quick lift.
10. “Sawing - scarify motor” ON/OFF buttons
Pressing the green start button will start the sawing - scarify motor. Before starting the sawing -
scarify motor, the treadle of the drive system must be in de downwards position and the quick lift lever
must be in the upwards position.
11. Control light “Phase incorrect”
This lamp shines when the phases of the power supply are incorrect. The power plug has a built in
phase inverter for easy and quick changing of the phases if the control light “Phase incorrect” lights up.
12. Hydraulic pump motor ON/OFF buttons
Pressing the green start button will start the driving motor, use the driving lever to start driving. The
hydraulic motor hast to be switched on before switching on the sawing motor. The red button will stop
the hydraulic motor.
13. Emergency shutdown button
Red mushroom-shaped shutdown push button, this button cuts off the power to the motors.
Turn to unlock the emergency stop button.
14. Hour counter
Shows the number of working hours. Useful for maintaining a proper maintenance schedule.
15. Amp meter
This meter shows the power consumption of the saw / scarify motor in ampere.
16. Plug for power supply
The plug for the power supply has a built in phase inverter.
If the motor turns the wrong way, just unplug the machine and change the phase inside the plug.

19
4.7 Control device BMC-335 GHY
Photo 1.
BMC-335 GHY
1
Treadle of drive system
2
Dust collector connection
3
Quick lift lever
4
Handwheel working depth
5
Lifting eye
6
Driving lever
7
Air filter
8
Hydraulic pump housing
9
Diesel motor
10
Ignition lock
11
Speed control lever
O
Position 0
I
Position I
II
Position II
A
Engine temperature display
B
Oil pressure display
C
Charge control
D
Operating display
E
Earth switch

20
1Treadle of drive system
It is possible to transport the machine without the use of the motor by pushing up the treadle (1). The
drive wheels are declutched of the drive motors now. In the downward position the wheels are
engaged to the drive motors. Make sure that the floor is flat, because the machine is uncontrolled now!
It is very dangerous to drive the machine on a grade or ramp when the treadle is in upwards
position!
2Dust hose connection
The dust hose to the dust collector must be connected here. Use hose clamps and industrial tape for a
reliable connection.
3Quick lift lever
In the upright position the drum is lifted off of the ground, in the downwards position, the drum is put
on the ground. The quick lift lever enables the operator to lift the complete drum without changing the
fine adjustment of the working depth. The lever must be in the upright position before start-up, in
order to prevent a run out of the motor under full load.
4Fine adjustment
The working depth can be adjusted by turning the fine adjustment wheel. The sawing depth must be
adjusted considering the surface to be treated. The progressively depth adjustment enables the sawing
blades to saw into the surface being treated only at the required and necessary depth. When the depth
adjustment is correctly selected, the machine will run quiet and constant.
6Driving lever
The drive unit control lever is used to control the machine’s drive unit. The function of the drive unit
control lever begins after adjusting the working depth of the machine with the quick lift. You should
pay attention that the drive unit control lever is locked in the neutral position before manipulating the
quick lift.
10 Ignition lock
The ignition lock is used to start the BMC 335 GHY electrical.
11 Speed control lever
With the speed control lever you can change the speed of the diesel engine. The speed control lever is
also used to shut down the engine.
A Engine temperature display
If the engine temperature display lights up, the cylinder head temperature is too high. Do not start the
engine. If the engine is running, switch off the engine immediately! Danger of engine damage.
B Oil pressure display
If the oil pressure display lights up, switch off the engine immediately! Danger of engine damage.
C Charge control
If the charge control lights up during operation, there is a fault in the alternator. In position (I) the
display lights up, but after starting the engine it will go out.
D Operating display
Lights up during operation when there is no engine fault.