HTC Floor Systems GL 270, GL 400, GL 450, GL 550 User Manual

HTC GL 270/400/450/550

MANUAL

GB

Translation of manual in original language

The Greyline series

Contact Information

HTC Sweden AB
Box 69
SE-614 22 Söderköping - Sweden
Tel: [phone]
Fax: [phone]

You can find addresses for our retailers and service partners on our website:

www.htc-floorsystems.com

Always specify the model and serial number when asking questions about your product.

Trademarks

HTC is a trademark owned by HTC Sweden AB. Other names and products mentioned
in this manual may be registered trademarks owned by the relevant companies.

© 2007 HTC Sweden AB. All rights reserved.

EC Declaration of conformity

Manufacturer: HTC Sweden AB

Box 69
SE-614 22 Söderköping
Sweden
[phone]

Type of equipment: Grinding machine

Make: HTC

Model: HTC GL 270

Year of manufacture: See machine name plate

Serial number: See machine name plate

As the manufacturer, we hereby declare under our sole responsibility that the above
product with serial numbers from 2010 onward conforms to the applicable regulations
in directives MD 2006/42/EC, EMC 2004/108/EC and LVD 2006/95/EC. The following
standards have been used as a basis: ISO 5349-1:2001, ISO 5349-2:2001, ISO
20643:2005, ISO 3741.

This product was CE-marked in 2010. The technical documentation is available from
the manufacturer.

Original of the EC declaration of conformity (Swedish). Other languages are
translations of the original of the EC declaration of conformity.

Söderköping, 12-05-2010

Peter Lundgren
Development Manager,
HTC Sweden AB

Kåre Kilgren
Product Manager,
HTC Sweden AB

EC Declaration of conformity

Manufacturer: HTC Sweden AB

Box 69
SE-614 22 Söderköping
Sweden
[phone]

Type of equipment: Grinding machine

Make: HTC

Model: HTC GL 400

Year of manufacture: See machine name plate

Serial number: See machine name plate

As the manufacturer, we hereby declare under our sole responsibility that the above
product with serial numbers from 2010 onward conforms to the applicable regulations
in directives MD 2006/42/EC, EMC 2004/108/EC and LVD 2006/95/EC. The following
standards have been used as a basis: ISO 5349-1:2001, ISO 5349-2:2001, ISO
20643:2005, ISO 3741.

This product was CE-marked in 2010. The technical documentation is available from
the manufacturer.

Original of the EC declaration of conformity (Swedish). Other languages are
translations of the original of the EC declaration of conformity.

Söderköping, 12-05-2010

Peter Lundgren
Development Manager,
HTC Sweden AB

Kåre Kilgren
Product Manager,
HTC Sweden AB

EC Declaration of conformity

Manufacturer: HTC Sweden AB

Box 69
SE-614 22 Söderköping
Sweden
[phone]

Type of equipment: Grinding machine

Make: HTC

Model: HTC GL 450

Year of manufacture: See machine name plate

Serial number: See machine name plate

As the manufacturer, we hereby declare under our sole responsibility that the above
product with serial numbers from 2010 onward conforms to the applicable regulations
in directives MD 2006/42/EC, EMC 2004/108/EC and LVD 2006/95/EC. The following
standards have been used as a basis: ISO 5349-1:2001, ISO 5349-2:2001, ISO
20643:2005, ISO 3741.

This product was CE-marked in 2010. The technical documentation is available from
the manufacturer.

Original of the EC declaration of conformity (Swedish). Other languages are
translations of the original of the EC declaration of conformity.

Söderköping, 12-05-2010

Peter Lundgren
Development Manager,
HTC Sweden AB

Kåre Kilgren
Product Manager,
HTC Sweden AB

EC Declaration of conformity

Manufacturer: HTC Sweden AB

Box 69
SE-614 22 Söderköping
Sweden
[phone]

Type of equipment: Grinder

Make: HTC

Model: HTC GL 550

Year of manufacture: See machine name plate

Serial number: See machine name plate

As the manufacturer, we hereby declare under our sole responsibility that the above
product with serial numbers from 2010 onward conforms to the applicable regulations
in directives MD 2006/42/EC, EMC 2004/108/EC and LVD 2006/95/EC. The following
standards have been used as a basis: ISO 5349-1:2001, ISO 5349-2:2001, ISO
20643:2005, ISO 3741.

This product was CE-marked in 2010. The technical documentation is available from
the manufacturer.

Original of the EC declaration of conformity (Swedish). Other languages are
translations of the original of the EC declaration of conformity.

Söderköping, 12-05-2010

Peter Lundgren
Development Manager,
HTC Sweden AB

Kåre Kilgren
Product Manager,
HTC Sweden AB

HTC GL
270/400/450/550 Table of contents

i

1 Introduction 1

1.1 General ............................................................................ 1

1.2 Responsibility .................................................................. 1

1.3 Manual ............................................................................. 1

1.3.1 Safety instructions – Explanation of symbols ..... 1

1.4 Transportation ................................................................. 2

1.5 On delivery ...................................................................... 2

1.6 Unpacking the machine ................................................... 2

1.7 Machine name plate ........................................................ 3

1.8 Handling and storage ...................................................... 3

1.9 Vibration and noise .......................................................... 4

1.9.1 Hand and arm vibrations .................................... 4

1.9.2 HTC GL 270 ....................................................... 4

1.9.3 HTC GL 400 ....................................................... 4

1.9.4 HTC GL 450 ....................................................... 4

1.9.5 HTC GL 550 ....................................................... 5

1.9.6 Sound pressure level .......................................... 5

2 Safety 6

2.1 General Information ......................................................... 6

2.2 Warnings ......................................................................... 6

2.3 Notes ............................................................................... 7

3 Machine description 9

3.1 General machine description ........................................... 9

3.2 Description of controls – Control panel ........................... 11

Table of contents

HTC GL

270/400/450/550

ii

4 Usage 13

4.1 General Information ......................................................... 13

4.2 Handle settings ................................................................ 14

4.3 Access to grinding tools .................................................. 15

4.4 Fitting and replacing grinding tools .................................. 15

4.4.1 Fitting grinding tools ........................................... 16

4.4.2 Changing grinding tools ...................................... 17

4.5 Preparations for dry grinding ........................................... 17

4.6 Separating and assembling the chassis and grinding

head ................................................................................ 18

4.6.1 HTC GL 270 ....................................................... 18

4.6.2 HTC GL 400, GL 450 and GL 550 ...................... 19

4.7 Operation ......................................................................... 19

4.7.1 Starting and stopping the machine ..................... 20

4.7.2 Emergency stop switch ...................................... 20

4.8 Making operation easier .................................................. 20

4.9 Edge grinder kit (accessory for HTC GL 270) ................. 21

4.9.1 Change to Edge Grinder Cover .......................... 21

4.9.2 Fitting the Edge Grinder Adapter ........................ 23

4.9.3 Positions for Edge Grinder Adapter .................... 24

5 Maintenance and repairs 26

5.1 General Information ......................................................... 26

5.2 Cleaning .......................................................................... 26

5.3 Daily ................................................................................ 26

5.4 Every week ...................................................................... 26

5.5 Every month (or 100 hours) ............................................. 27

5.6 Repairs ............................................................................ 27

5.7 Spare parts ...................................................................... 27

6 Faultfinding 28

6.1 General Information ......................................................... 28

6.1.1 The machine will not start ................................... 28

6.1.2 The machine vibrates or wears the tool

unevenly ............................................................. 28

6.1.3 The machine is grinding at an angle .................. 28

6.1.4 The fuses trip frequently ..................................... 28

6.1.5 The machine cannot cope .................................. 28

6.1.6 The machine grinds unevenly (only applies to

HTC GL 450 and HTC GL 550) .......................... 29

HTC GL
270/400/450/550 Table of contents

iii

7 Technical data 30

7.1 HTC GL 270 .................................................................... 30

7.2 HTC GL 400 .................................................................... 32

7.3 HTC GL 450 .................................................................... 34

7.4 HTC GL 550 .................................................................... 36

8 Environment 38

9 Warranty and CE marking 39

9.1 Warranty .......................................................................... 39

9.2 CE marking ...................................................................... 39

Table of contents

HTC GL

270/400/450/550

iv

HTC GL
270/400/450/550 Introduction

1.0 1

1 Introduction

1.1 General

The machine models in HTC's Greyline series are grinding machines that can be used to
grind, strip and clean all types of floors. The area of application for the machine
depends on the choice of tool.

Read the manual carefully, so you are totally familiar with the machine before you start
to use it. Contact your local retailer for further information. For contact information, see
Contact Information at the start of the manual.

1.2 Responsibility

Even though every effort has been made to make this manual as complete and accurate
as possible, we bear no responsibility for incorrect or missing information. HTC
reserves the right to change descriptions in this manual without giving prior notice.

This manual is protected by the Copyright Act and no part of it may be copied or used
in any other way without the written approval of HTC.

1.3 Manual

In addition to the general functions, this manual deals with the areas of application and
the maintenance of the grinder.

1.3.1 Safety instructions – Explanation of symbols

A number of symbols are used in the manual to highlight the most important sections,
see below. In order to avoid both personal injury and material damage as far as possible,
it is extremely important to read and understand the text next to these symbols
particularly carefully. There are other symbols indicating practical tips. These are to
help you use the machine in the easiest and most effective way.

The following symbols are used in the document to indicate where special attention is
needed.

Warning!

This symbol means Warning! and indicates that incorrect use can result in
material damage to the machine or accessories. If you see this symbol next to a
section of text, you must be particularly careful when reading through the text
and not carry out any stages of which you are unsure. This is to protect you and
other users and to avoid damaging the machine or other equipment.

Introduction

HTC GL

270/400/450/550

2 1.0

Note!

This symbol means Note! and indicates that material damage can occur if the
machine or its accessories are used incorrectly. If you see this symbol next to a
section of text, you must be particularly careful when reading through the text
and not carry out any stages of which you are unsure. This is to avoid damage
to the machine or other equipment.

Tip!

This symbol means Tip!and indicates that you can get tips and advice on ways
to make operating your machine or associated equipment easier, and to avoid
wear. When you see this symbol you should read the accompanying text to
facilitate your work and increase the service life of the machine.

1.4 Transportation

The machine is best transported securely fastened to a pallet.

1.5 On delivery

The following items are included in the delivery. Contact you retailer if anything is
missing.

• Grinding machine

• Manual disc

• Hammer EZ system

• Face spanner (not for HTC GL 270 and HTC GL 400)

• Lock spring tool holder

• Allen key

• Gloves

• HTC Cap

1.6 Unpacking the machine

Warning!

Read through the safety instructions and the manual carefully before use.

HTC GL
270/400/450/550 Introduction

1.0 3

• Check carefully to see if the packaging or machine has been damaged during
delivery. If there is any sign of damage, contact your retailer and report it. Report
packaging damage to the transport company as well.

• Check that the delivery matches the order. If there are any discrepancies, contact
your retailer.

1.7 Machine name plate

The machine name plate provides the following information. The model and serial
number must be specified when ordering spare parts for the machine.

Figure 1-1. Machine name plate

1. Model

2. Model number

3. Serial number

4. Year of manufacture

5. Power (kW)

6. Voltage (V)

7. Current (A)

8. Frequency (Hz)

9. Rotational speed (r.p.m.)

10. Weight (kg)

11. Address field

1.8 Handling and storage

The machine should be stored in a dry, warm location when not in use. Otherwise it may
become damaged by condensation and coldness.

Introduction

HTC GL

270/400/450/550

4 1.0

1.9 Vibration and noise

Warning!

Always use ear muffs when using the machine.

1.9.1 Hand and arm vibrations

Hand and arm weighted vibration level [m/s²] for HTC GL 550 HTC GL 450 HTC GL
400 HTC GL 270 have been measured with equipment approved according to ISO
5349-1:2001. The measurement uncertainty for the measurement apparatus has been
measured as +/- 2%.

The machine has been tested in accordance with ISO 5349-2:2001 and ISO 20643:2005
in order to identify the operations that contribute to the most frequent vibration
exposures. At vibration levels > 2.5 m/s², the exposure time should be limited in
accordance with the table below. For vibration levels > 5 m/s², immediate measures
should be taken by the employer to ensure that the exposure time does not exceed the
time specified in the table below.

1.9.2 HTC GL 270

Identified work conditions Measured values

[m/s²]

Daily permitted exposure
(number of hours)

Grinding/polishing 2,43 Unrestricted

Floor preparation (T-rex) 9,37 2,28

1.9.3 HTC GL 400

Identified work conditions Measured values

[m/s²]

Daily permitted exposure
(number of hours)

Grinding/polishing 2,77 Unrestricted

Floor preparation (T-rex) 4,83 8,56

1.9.4 HTC GL 450

Identified work conditions Measured values

[m/s²]

Daily permitted exposure
(number of hours)

Grinding/polishing 1,16 Unrestricted

Floor preparation (T-rex) 2,35 Unrestricted

HTC GL
270/400/450/550 Introduction

1.0 5

1.9.5 HTC GL 550

Identified work conditions Measured values

[m/s²]

Daily permitted exposure
(number of hours)

Grinding/polishing 2,5 Unrestricted

Floor preparation (T-rex) 3,87 13,4

1.9.6 Sound pressure level

This machine has been tested for noise in accordance with ISO 3741. For information
on sound pressure levels, see the table in chapter Technical data, page 30.

Safety

HTC GL

270/400/450/550

6 1.0

2 Safety

2.1 General Information

This chapter contains all the warnings and notes that should be considered for HTC GL
270, HTC GL 400, HTC GL 450, HTC GL 550.

2.2 Warnings

Warning!

The machine may only be used or repaired by personnel who have received the
requisite theoretical and practical training and who have read the user manual.

Warning!

Never use the machine in an environment with a risk of explosion or fire.
Familiarise yourself with the fire-protection instructions for the working area
and follow them.

Warning!

Secure the area around the working area. No unauthorised persons should be
allowed within a 15-metre radius of the machine. If a loose object were to catch
under the grinding head, this could be flung out and cause personal injury.

Warning!

Use protective equipment such as safety shoes, safety goggles, protective
gloves, breathing mask and ear muffs.

Warning!

The machine must only be started with the grinding head down. The rotating
disc must be touching the floor and the correct tool must be fitted.

Warning!

Read through the safety instructions and the manual carefully before use.

Warning!

Always use ear muffs when using the machine.

Warning!

During grinding, the tools become very hot. Tip the machine back and allow it
to stand for a short while. Use protective gloves when removing the tools.

Warning!

Disconnect the electrical supply, when changing tools or repairing the machine.

HTC GL
270/400/450/550 Safety

1.0 7

Warning!

The machine must only be used and moved on level surfaces. There is a risk of
crushing if the machine starts to roll.

Warning!

Connect the machine to an earth fault breaker.

Warning!

Do not clean the machine using a high-pressure washer. Otherwise moisture
may penetrate electrical elements and damage the machine’s drive system.

Warning!

Always ensure that the machine's connection cable is hanging freely without
any tensile loading. Otherwise, the cable, coupling socket and plug may be
damaged, which can cause both physical damage and personal injury.

Warning!

Always ensure that the machine's handle is in the upright position when the
machine is tipped to enable access beneath the grinding head. Otherwise, there
is a risk that the machine could fall back and cause personal injury.

Warning!

The lifting handles on the motor are intended for lifting the grinding head,
when it is separated from the chassis, and then only for short, low lifts, e.g. into
the boot of a car. The lifting handles are not to be used for lifting the complete
machine.

2.3 Notes

Note!

The machine may only be used to grind, strip and clean floor coverings and
other materials that are stated in this manual or materials that are recommended
by HTC.

Note!

Only original tools and spare parts from HTC may be used for the machine.
Otherwise neither the CE marking nor the warranty will be valid.

Note!

For the CE marking to be valid, the instructions in this manual must be
followed.

Safety

HTC GL

270/400/450/550

8 1.0

Note!

The machine may only be lifted using the lifting eye on the chassis in
accordance with the relevant instructions.

Note!

Make sure that the floating cover can move freely within its movement margins
and that the cover rests on the floor before starting the machine.

Note!

The machine should be stored in a dry, warm (plus degrees) location when not
in use.

Note!

If the machine is stored in a cold (minus degrees) location, it must be placed in
a warm (plus degrees) location for at least two hours before use.

Note!

The appropriated dust extractor must be used when dry grinding. Contact HTC
for model recommendation.

Note!

The dust extractor's suction hose must be connected to the appropriate socket
on the machine. Adjust the dust extractor to match the grinder's capacity.

Note!

Do not use the emergency stop switch to stop the machine, except in
emergencies.

Note!

As long as the emergency stop switch is pressed in, the machine cannot be
started. Reset by turning the switch 45° clockwise so that it pops out again. The
machine can then be restarted.

Note!

Check that all the parts are correctly attached and that all the screws are
tightened properly before the machine is started.

Note!

After removing glue, always lift the grinding heads so they do not stick to the
floor and damage machine components or the floor when the machine is
restarted.

HTC GL
270/400/450/550 Machine description

1.0 9

3 Machine description

3.1 General machine description

The machine is constructed from a number of main components, see Figure 3-1, page

10 and Figure 3-2, page 11. For each machine model in the series, there are a

number of different motor alternatives, see tables in Technical data, page 30.

The machine is based on a wheeled chassis. The motor with the rotating grinding unit is
mounted on the lower part of the chassis enabling some movement between the chassis
and the motor assembly.

The machines in the series are equipped with a lifting eye on the chassis and two lifting
handles on the grinding head, see Figure 3-1, page 10. The lifting eye is intended
for lifting the complete machine. The lifting handles are intended for lifting the grinding
head, when it is separated from the chassis, and then only for short, low lifts, e.g. into
the boot of a car. The lifting handles are not to be used for lifting the complete machine.

The handle can be placed in a number of different working positions by loosening the
locking mechanism for adjusting the handle (see Figure 3-2, page 11) and moving
the handle up and down to the desired working height. The angle of the handle (see

Figure 3-2, page 11) can also be adjusted to obtain the best ergonomics. The handle

can also be placed in the upright position, which must be used when the machine is
tipped to enable access under the grinding head, e.g. when changing tools.

The machine has a connection for an external suction hose, which is used during dry
grinding.

The machine can be easily equipped with a large number of tools, depending on the
material to be ground. For the different tools, see HTC’s Product Catalogue under the
Grinding Guide tab.

Machine description

HTC GL

270/400/450/550

10 1.0

Figure 3-1. The front of the machine

1. Control cabinet

2. Lifting eye for the machine

3. Plug

4. Motor

5. Lifting handles for grinding head

6. Floating grinding cover

7. Wheels

8. Suction hose

9. Connection for vacuum

10. Quick release coupling motor cable

HTC GL
270/400/450/550 Machine description

1.0 11

Figure 3-2. The machine's rear

1. Control panel

2. Adjustable handle

3. Connection for vacuum

4. Locking mechanism for handle adjustment

5. Locking bolts/quick release grinding head

3.2 Description of controls – Control panel

The picture below shows the machine's control panel:

Figure 3-3. Control Panel

1. O/I- Start/stop the machine. Turn the knob to "I" to start the machine. Hold the
knob in start position "I" for ca. 1-2 seconds. Turn the knob to "O" to switch
off the machine.

Machine description

HTC GL

270/400/450/550

12 1.0

2. EM-Stop - Emergency stop switch: Press the switch in an emergency to cut the
power to the machine. Reset the emergency stop switch by turning it 45°
clockwise.

HTC GL
270/400/450/550 Usage

1.0 13

4 Usage

4.1 General Information

The following section describes how to change tools and how to operate the grinding
machine. This section does not deal with the technical aspects of grinding, such as
selection of grinding tools, etc. For choice of tools, see HTC’s Product Catalogue under
the Grinding Guide tab.

Warning!

The machine may only be used or repaired by personnel who have received the
requisite theoretical and practical training and who have read the user manual.

Warning!

Never use the machine in an environment with a risk of explosion or fire.
Familiarise yourself with the fire-protection instructions for the working area
and follow them.

Warning!

Secure the area around the working area. No unauthorised persons should be
allowed within a 15-metre radius of the machine. If a loose object were to catch
under the grinding head, this could be flung out and cause personal injury.

Warning!

Use protective equipment such as safety shoes, safety goggles, protective
gloves, breathing mask and ear muffs.

Warning!

The machine must only be started with the grinding head down. The rotating
disc must be touching the floor and the correct tool must be fitted.

Warning!

The machine must only be used and moved on level surfaces. There is a risk of
crushing if the machine starts to roll.

Warning!

The lifting handles on the motor are intended for lifting the grinding head,
when it is separated from the chassis, and then only for short, low lifts, e.g. into
the boot of a car. The lifting handles are not to be used for lifting the complete
machine.

Usage

HTC GL

270/400/450/550

14 1.0

Warning!

Always ensure that the machine's connection cable is hanging freely without
any tensile loading. Otherwise, the cable, coupling socket and plug may be
damaged, which can cause both physical damage and personal injury.

Warning!

Connect the machine to an earth fault breaker.

Tip!

Check the minimum recommended cable area before using an extension cord.
You will find the recommended cable area under Technical data, page 30.

4.2 Handle settings

The picture below shows the handle positions on the machine.

Figure 4-1. Handle settings

1. Upright position - used when tipping the machine to ease access to the
underside of the grinding head, e.g. when changing tools

2. Working position - the working height can be adjusted to one of several
positions with the machine's adjustable handle

HTC GL
270/400/450/550 Usage

1.0 15

Warning!

Always ensure that the machine's handle is in the upright position when the
machine is tipped to enable access beneath the grinding head. Otherwise, there
is a risk that the machine could fall back and cause personal injury.

• Adjust and lock the handle in the desired position, using the locking mechanism,
seeFigure 3-2, page 11.

• Adjust the handle to the desired angle to achieve the best ergonomics, see

Figure 3-2, page 11.

4.3 Access to grinding tools

Warning!

During grinding, the tools become very hot. Tip the machine back and allow it
to stand for a short while. Use protective gloves when removing the tools.

Warning!

Disconnect the electrical supply, when changing tools or repairing the machine.

1. Set the handle to the upright position - see Figure 4-1, page 14

2. Tip the machine backwards so that it rests on the ground.

4.4 Fitting and replacing grinding tools

Warning!

Disconnect the electrical supply, when changing tools or repairing the machine.

Warning!

During grinding, the tools become very hot. Tip the machine back and allow it
to stand for a short while. Use protective gloves when removing the tools.

Note!

Check that the motor's direction of rotation agrees with the direction arrow on
the motor. This is to guarantee the correct use of the T-Rex A grinding tool.

Usage

HTC GL

270/400/450/550

16 1.0

4.4.1 Fitting grinding tools

1. Slide the grinding tool diagonally from above down into the appropriate guide
slot on the tool holder. Then push the tool fully into the guide slot, seeFigure

4-2, page 16.

Figure 4-2. Fitting grinding tools

2. Lock the grinding tool into the tool holder by giving it a few light taps with a
rubber hammer - see Figure 4-3, page 16.

Figure 4-3. Locking grinding tools

HTC GL
270/400/450/550 Usage

1.0 17

4.4.2 Changing grinding tools

1. Remove the grinding tool by giving it a few light taps with a rubber hammer so
the locking mechanism releases, seeFigure 4-4, page 17. Then draw the tool
up out of the guide slot.

Figure 4-4. Removing grinding tools

2. Slide the grinding tool diagonally, from above, down into the appropriate guide
slot on the tool holder, seeFigure 4-2, page 16. Then push the tool fully into
the guide slot.

3. Lock the grinding tool into the tool holder by giving it a few light taps with a
rubber hammer - see Figure 4-3, page 16.

4.5 Preparations for dry grinding

Note!

Make sure that the floating cover can move freely within its movement margins
and that the cover rests on the floor before starting the machine.

1. Connect a dust extractor to the machine. For dust extractor models, see under the
Suction System tab in the HTC Product Catalogue.

Note!

The dust extractor's suction hose must be connected to the appropriate
socket on the machine. Adjust the dust extractor to match the grinder's
capacity.

2. Inspect the floor carefully and remove any objects sticking up, such as
reinforcement rods or bolts, and any debris that could get caught in the machine.

Usage

HTC GL

270/400/450/550

18 1.0

3. Attach the appropriate tool to the machine.

4. Set the handle to the desired height and with the desired angle for the best
working position.

4.6 Separating and assembling the chassis and
grinding head

The machine can be split into two parts; the chassis and the grinding head. This can be
useful, for example when there is a need to pack the machine better for transport or
during maintenance and repair of one of the machine's components.

• Hold the chassis securely, when the locking bolts and the quick release are

loosened, to prevent the chassis from falling to the ground and possibly causing
material damage or personal injury.

Tip!

Ask someone to hold the chassis while you loosen the locking bolts and the
quick release.

4.6.1 HTC GL 270

Remove the grinding head from the chassis as follows:

1. Undo the quick release coupling for the motor cable, see Figure 3-1, page 10.

2. Remove the suction hose from the grinding cover or from the vacuum

connection, see Figure 3-1, page 10 and Figure 3-2, page 11.

3. Remove the safety pins from the quick release, see Figure 3-2, page 11.

4. Place the red locking hooks in each quick release in the upright position.

5. Slowly pull the chassis back from the grinding head.

Attach the grinding head to the chassis as follows:

1. Push the chassis's fastener into the quick release and make sure that the red

locking hooks drop down, so the safety pins can be put in place.

2. Replace the vacuum hose and connect the quick release coupling to the motor.

The machine is now ready to use.

HTC GL
270/400/450/550 Usage

1.0 19

Tip!

Always make sure that the safety pins are fixed correctly when transporting the
machine.

4.6.2 HTC GL 400, GL 450 and GL 550

Remove the grinding head from the chassis as follows:

1. Undo the quick release coupling for the motor cable, see Figure 3-1, page 10.

2. Remove the suction hose from the grinding cover or from the vacuum

connection, see Figure 3-1, page 10 and Figure 3-2, page 11.

3. Remove the safety pins from the locking bolts, see Figure 3-2, page 11.

4. Pull the locking bolts out of the fastenings on both sides of the grinding head.

Tip!

Ask someone to hold the chassis while you loosen the locking bolts and
the quick release.

5. Slowly pull the chassis back from the grinding head.

Attach the grinding head to the chassis as follows:

1. Push the chassis in towards the grinding head's lifting eye.

2. Push the locking bolts in on both sides of the grinding head, making sure that

they go all the way through, and attach the locking pins.

3. Replace the vacuum hose and connect the quick release coupling to the motor.

The machine is now ready to use.

4.7 Operation

The machine's functions can be controlled using the control panel - see Figure 3-3,

page 11.

During operation, the operator pushes the grinder forwards over the floor surface.

Usage

HTC GL

270/400/450/550

20 1.0

4.7.1 Starting and stopping the machine

1. Connect the electricity supply by plugging in the plug.

2. Make sure the emergency stop switch is reset.

3. Turn the Power knob to "I" to start the machine. Hold the knob in the start

position "I" for ca 1-2 seconds.

4. Turn the Power knob to "O" to switch off the machine.

4.7.2 Emergency stop switch

The emergency stop switch must only be used in an emergency.

When the switch is pressed, all electrically-powered equipment on the machine are
turned off.

Note!

Do not use the emergency stop switch to stop the machine, except in
emergencies.

Note!

As long as the emergency stop switch is pressed in, the machine cannot be
started. Reset by turning the switch 45° clockwise so that it pops out again. The
machine can then be restarted.

Note!

Do not hold the knob in start position "I" longer than is needed to start the
machine. Holding the knob in start position "I" for longer will damage the
machine.

4.8 Making operation easier

In order to keep the suction hose for the dust extractor and the power cable out of the
working area and/or path of the machine, the hose and cable can be arranged as shown
in the picture below.

HTC GL
270/400/450/550 Usage

1.0 21

Figure 4-5. Making operation easier

Tip!

By arranging the hose and cable as shown in the picture, you avoid disruptive
stoppages caused by having to re-position the cable and hose.

4.9 Edge grinder kit (accessory for HTC GL 270)

By attaching the edge grinder kit accessory to the HTC GL 270, there is the option to
use the machine as an edge grinding machine. The attachment is done in a few easy
steps, and with just a few parts, but it provides increased flexibility in the use of the
machine. The edge grinder kit makes it possible to grind edges and corners effectively
from different directions.

Follow the instructions under Change to Edge Grinder Cover, Attachment of Edge
Grinder Adapter, and Positions for Edge Grinder Adapter when attaching the edge
grinder kit.

4.9.1 Change to Edge Grinder Cover

Perform the change in the order below. The numbers in Figure 4-6, page 22
correspond to the numbers in the procedure below:

1. Loosen the lower screw and remove the tool holder.

2. Remove the four motor bolts.

Usage

HTC GL

270/400/450/550

22 1.0

3. Remove the machine's grinding cover.

4. Replace the grinding cover with the edge grinding cover and assemble all of the

parts.

Note!

Check that all the parts are correctly attached and that all the screws are
tightened properly before the machine is started.

Figure 4-6. Removal of grinding cover - fitting the edge grinding cover

HTC GL
270/400/450/550 Usage

1.0 23

4.9.2 Fitting the Edge Grinder Adapter

Attach the edge grinding adapter in the order given below. The numbers in Figure 4-7,

page 23 and Figure 4-8, page 23 correspond to the numbers in the procedure

below:

1. Remove the locking bolts from the chassis.

2. Insert the edge grinder adapter's lower attachment into the chassis.

3. Fold the edge grinder adapter into the chassis.

4. Lock the edge grinder adapter in the chassis using the new, longer, locking bolts

that are enclosed with the edge grinder kit.

5. Lock the locking bolts with the safety pins.

Figure 4-7. Attaching the edge grinder adapter, steps 1 - 3

Figure 4-8. Attaching the edge grinder adapter, steps 4 - 5

Usage

HTC GL

270/400/450/550

24 1.0

4.9.3 Positions for Edge Grinder Adapter

The grinding head can be attached in the right, left or centre position on the edge
grinder adapter. This gives the option to grind edges and corners effectively from
different directions.

Change between left and right position:

• Detach the grinding head from the edge grinder adapter.

• Slightly loosen the locking knob, see position 1 in Figure 4-9, page 24.

• Turn the hoop 180°, see position 2 in Figure 4-9, page 24. Then firmly lock

the locking knob (Figure 4-10, page 24).

Figure 4-9. Turning the hoop, left - right

Figure 4-10. Hoop in right-hand position

Place in the centre position (Figure 4-11, page 25):

HTC GL
270/400/450/550 Usage

1.0 25

• Screw the locking knob out completely. Then firmly lock the locking knob.

Figure 4-11. Hoop in the centre position

Maintenance and repairs

HTC GL

270/400/450/550

26 1.0

5 Maintenance and repairs

5.1 General Information

We recommend regular inspections of all seals.

Warning!

Disconnect the electrical supply, when changing tools or repairing the machine.

Warning!

Use protective equipment such as safety shoes, safety goggles, protective
gloves, breathing mask and ear muffs.

5.2 Cleaning

Warning!

Do not clean the machine using a high-pressure washer. Otherwise moisture
may penetrate electrical elements and damage the machine’s drive system.

• Always clean the machine after use with a damp sponge or cloth.

5.3 Daily

• Check for wear to the grinding tool – abnormal or uneven wear may indicate a

damaged grinding holder.

• Check the tool holder and grinding holder to ensure that no damage or cracks

have arisen. Replace the parts if there is any damage.

• Check that the brush strip on the grinding cover is not damaged and that it is

correctly attached.

5.4 Every week

• Wash the machine.

• Check the grinding holders. Remove the tools and run the machine in the air. If

the grinding holders oscillate or wobble significantly, they are damaged.

Tip!

Recondition all the grinding holders at the same time.

HTC GL
270/400/450/550 Maintenance and repairs

1.0 27

5.5 Every month (or 100 hours)

• Check that all screws and joints are tightened and correctly attached.

• Check that the grinding cover is whole and undamaged.

• Check the upper belt and replace if necessary. See under The machine grinds

unevenly (only applies to HTC GL 450 and HTC GL 550), page 29 for

instructions on how to perform the check.

• Check the seals on the shafts on which the upper belt runs and replace if

necessary, (only applies to HTC GL 450 and HTC GL 550).

• Scrape and vacuum-clean the parts shielded by the grinding cover.

• Test run and listen for any dissonance from the bearings.

5.6 Repairs

Any repairs that may be required must be carried out by a HTC Service Centre, which
has trained service personnel and uses HTC original parts and accessories. Contact your
retailer if your machine requires servicing. For contact information, see Contact
Information at the start of the manual.

5.7 Spare parts

To ensure rapid delivery of spare parts, always specify the model, the machine's serial
number and the spare part number when ordering. Information on the model and serial
number can be found on the machine's name plate.

Information on spare part numbers can be found in the machine's spare parts list which
is available to read or print out from the accompanying digital media or HTC's website:

www.htc-floorsystems.com

Only original tools and original spare parts from HTC may be used. Otherwise neither
the CE marking nor the warranty will be valid.

Faultfinding

HTC GL

270/400/450/550

28 1.0

6 Faultfinding

6.1 General Information

This chapter describes faults that may occur and how to deal with them. If the fault
cannot be dealt with, or if there are other faults, contact your nearest retailer. See
Contact Information at the front of the manual.

6.1.1 The machine will not start

• Check if the emergency stop switch on the control panel is pressed. Reset the

switch by turning it 45° clockwise.

• Check that the connection to the mains supply is correct.

• Check that the motor cable is attached correctly.

• Check that the fuses or earth fault breaker on the mains supply have not been

tripped.

6.1.2 The machine vibrates or wears the tool unevenly

• Recondition the grinding holder by replacing the sleeves and vibration damper.

• Check that there is movement between the chassis and grinding head.

6.1.3 The machine is grinding at an angle

• Recondition the grinding holder. See under The machine vibrates or wears the

tool unevenly, page 28.

• Check that there is movement between the chassis and grinding head.

6.1.4 The fuses trip frequently

• The load is too high on the distribution box to which the machine is connected.

Try changing socket.

• Check the tools. Ensure that the correct tools are used, that they are in working

order and that they are correctly fitted.

6.1.5 The machine cannot cope

• Heavy load. Press the handle down slightly so that the grinding head eases

slightly away from the surface being ground.

• Ensure the mains supply quality by checking that there is full voltage on the

motor's phase/phases.

HTC GL
270/400/450/550 Faultfinding

1.0 29

• Sticky coating on the surface being ground. Run half of the machine on the

surface to be cleaned and half on the clean surface. This removes any residue
from the tools.

• Check the tools. Ensure that the correct tools are used, that they are in working

order and that they are correctly fitted.

• Voltage drop. Check that the cable area complies with HTC's recommendations.

Tip!

Check the minimum recommended cable area before using an extension cord.
You will find the recommended cable area under Technical data, page 30.

6.1.6 The machine grinds unevenly (only applies to HTC GL 450 and HTC
GL 550)

Note!

The machine must not be connected to the mains supply when carrying out the
points below.

• Check that the upper belt is undamaged by turning the grinding holders a few

turns. The grinding head must rotate in the opposite direct to the grinding
holders.

• Check that the inner belt is undamaged by turning one of the grinding holders a

few turns. The other grinding holders must then rotate in the same direction as
the grinding holder that is being turned.

Technical data

HTC GL

270/400/450/550

30 1.0

7 Technical data

The tables and pictures below show the technical data and dimensions for the respective
machine.

7.1 HTC GL 270

HTC GL 270
110V 50Hz
GB

HTC GL 270
110V 60Hz
US

HTC GL 270
230V 50Hz
EU

HTC GL 270
230V 60Hz
US

Part number 113137 113121 113120 113154

Total machine weight 53 kg 53 kg 53 kg 53 kg

Weight, grinding head 37 kg 37 kg 37 kg 37 kg

Chassis weight 16 kg 16 kg 16 kg 16 kg

Grinding pressure 34 kg 34 kg 34 kg 34 kg

Grinding diameter 270 mm 270 mm 270 mm 270 mm

Grinding discs 1 x 270 mm 1 x 270 mm 1 x 270 mm 1 x 270 mm

Motor 1.5 kW 1.5 kW 1.5 kW 1.5 kW

Tension 1 x 110 V 1 x 110 V 1 x 230 V 1 x 230 V

Current 17.58 A 17.58 A 8.31 A 8.31 A

Rec. minimum cable area 2.5 mm² 2.5 mm² 1.5 mm² 1.5 mm²

Frequency 50 Hz 60 Hz 50 Hz 60 Hz

Rotational speed, grinding discs 960 r.p.m. 1152 r.p.m. 960 r.p.m. 1152 r.p.m.

Storage temperature -20...+40 °C -20...+40 °C -20...+40 °C -20...+40 °C

Working temperature -20...+40 °C -20...+40 °C -20...+40 °C -20...+40 °C

Humidity 5-90 % 5-90 % 5-90 % 5-90 %

Sound pressure level, average value
over time according to ISO 3741,
measurement uncertainty according to
class 1 measuring instruments for
sound level meters.

98 dBA 98 dBA 98 dBA 98 dBA

Vibrations, grinding/polishing 2.43 m/s² 2.43 m/s² 2.43 m/s² 2.43 m/s²

Permitted daily exposure,
grinding/polishing

Unrestricted Unrestricted Unrestricted Unrestricted

Vibrations, Floor preparation (T-Rex) 9.37 m/s² 9.37 m/s² 9.37 m/s² 9.37 m/s²

Permitted daily exposure, Floor
preparation (T-Rex)

2.28 hrs 2.28 hrs 2.28 hrs 2.28 hrs

HTC GL
270/400/450/550 Technical data

1.0 31

Figure 7-1. Height and length of the machine in millimetres

Figure 7-2. Width of the machine in millimetres

Technical data

HTC GL

270/400/450/550

32 1.0

7.2 HTC GL 400

HTC GL 400
3x230V 50Hz
EU

HTC GL 400
3x400V EU

HTC GL 400
3x460V US

Part number 113124 113122 113123

Total machine weight 78 kg 78 kg 81 kg

Weight, grinding head 50 kg 50 kg 53 kg

Chassis weight 28 kg 28 kg 28 kg

Grinding pressure 47 kg 47 kg 50 kg

Grinding diameter 400 mm 400 mm 400 mm

Grinding discs 1 x 400 mm 1 x 400 mm 1 x 400 mm

Motor 4 kW 4 kW 3 kW

Tension 3 x 230 V 3 x 400 V 3 x 460 V

Current 14.37 A 8.26 A 5.87 A

Recommended minimum cable area 2.5 mm² 2.5 mm² 2.5 mm²

Frequency 50 Hz 50 Hz 60 Hz

Rotational speed, grinding discs 1430 r.p.m. 1430 r.p.m. 1160 r.p.m.

Storage temperature -20...+40 °C -20...+40 °C -20...+40 °C

Working temperature -20...+40 °C -20...+40 °C -20...+40 °C

Humidity 5-90 % 5-90 % 5-90 %

Sound pressure level, average value over time
according to ISO 3741, measurement uncertainty
according to class 1 measuring instruments for sound
level meters.

100 dBA 100 dBA 100 dBA

Vibrations, grinding/polishing 2.77 m/s² 2.77 m/s² 2.77 m/s²

Permitted daily exposure, grinding/polishing Unrestricted Unrestricted Unrestricted

Vibrations, Floor preparation (T-Rex) 4.83 m/s² 4.83 m/s² 4.83 m/s²

Permitted daily exposure, Floor preparation (T-Rex) 8.56 hrs 8.56 hrs 8.56 hrs

HTC GL
270/400/450/550 Technical data

1.0 33

Figure 7-3. Height and length of the machine in millimetres

Figure 7-4. Width of the machine in millimetres

Technical data

HTC GL

270/400/450/550

34 1.0

7.3 HTC GL 450

HTC GL 450
110V 50Hz
GB

HTC GL 450
110V 60Hz
US

HTC GL 450
230V 50Hz
EU

HTC GL 450
230V 60Hz
US

Part number 113127 113155 113126 113144

Total machine weight 95 kg 95 kg 95 kg 95 kg

Weight, grinding head 68 kg 68 kg 68 kg 68 kg

Chassis weight 27 kg 27 kg 27 kg 27 kg

Grinding pressure 63 kg 63 kg 63 kg 63 kg

Grinding diameter 450 mm 450 mm 450 mm 450 mm

Grinding discs 3 x 180 mm 3 x 180 mm 3 x 180 mm 3 x 180 mm

Motor 1.5 kW 1.5 kW 1.5 kW 1.5 kW

Tension 1 x 110 V 1 x 110 V 1 x 230 V 1 x 230 V

Current 17.58 A 17.58 A 8.31 A 8.31 A

Recommended minimum cable area 2.5 mm² 2.5 mm² 1.5 mm² 1.5 mm²

Frequency 50 Hz 60 Hz 50 Hz 60 Hz

Rotational speed, grinding discs 480 r.p.m. 576 r.p.m. 480 r.p.m. 576 r.p.m.

Storage temperature -20...+40 °C -20...+40 °C -20...+40 °C -20...+40 °C

Working temperature -20...+40 °C -20...+40 °C -20...+40 °C -20...+40 °C

Humidity 5-90 % 5-90 % 5-90 % 5-90 %

Sound pressure level, average value
over time according to ISO 3741,
measurement uncertainty according to
class 1 measuring instruments for
sound level meters.

95 dBA 95 dBA 95 dBA 95 dBA

Vibrations, grinding/polishing 1.16 m/s² 1.16 m/s² 1.16 m/s² 1.16 m/s²

Permitted daily exposure,
grinding/polishing

Unrestricted Unrestricted Unrestricted Unrestricted

Vibrations, Floor preparation (T-Rex) 2.35 m/s² 2.35 m/s² 2.35 m/s² 2.35 m/s²

Permitted daily exposure, Floor
preparation (T-Rex)

Unrestricted Unrestricted Unrestricted Unrestricted

HTC GL
270/400/450/550 Technical data

1.0 35

Figure 7-5. Height and length of the machine in millimetres

Figure 7-6. Width of the machine in millimetres

Technical data

HTC GL

270/400/450/550

36 1.0

7.4 HTC GL 550

HTC GL 550
3x230V 50Hz
EU

HTC GL 550
3x400V EU

HTC GL 550
3x460V US

Part number 113131 113128 113130

Total machine weight 131 kg 131 kg 131 kg

Weight, grinding head 102 kg 102 kg 102 kg

Chassis weight 29 kg 29 kg 29 kg

Grinding pressure 94.7 kg 94.7 kg 94.7 kg

Grinding diameter 530 mm 530 mm 530 mm

Grinding discs 3 x 230 mm 3 x 230 mm 3 x 230 mm

Motor 4 kW 4 kW 4.6 kW

Tension 3 x 230 V 3 x 400 V 3 x 460 V

Current 14.37 A 8.26 A 8.26 A

Recommended minimum cable area 2.5 mm² 2.5 mm² 2.5 mm²

Frequency 50 Hz 50 Hz 60 Hz

Rotational speed, grinding discs 715 r.p.m. 715 r.p.m. 858 r.p.m.

Storage temperature -10...+40 °C -10...+40 °C -10...+40 °C

Working temperature -10...+40 °C -10...+40 °C -10...+40 °C

Humidity 5-90 % 5-90 % 5-90 %

Sound pressure level, average value over time
according to ISO 3741, measurement uncertainty
according to class 1 measuring instruments for sound
level meters.

97 dBA 97 dBA 97 dBA

Vibrations, grinding/polishing 2.50 m/s² 2.50 m/s² 2.50 m/s²

Permitted daily exposure, grinding/polishing Unrestricted Unrestricted Unrestricted

Vibrations, Floor preparation (T-Rex) 3.87 m/s² 3.87 m/s² 3.87 m/s²

Permitted daily exposure, Floor preparation (T-Rex) 13.40 hrs 13.40 hrs 13.40 hrs

HTC GL
270/400/450/550 Technical data

1.0 37

Figure 7-7. Height and length of the machine in millimetres

Figure 7-8. Width of the machine in millimetres

Environment

HTC GL

270/400/450/550

38 1.0

8 Environment

HTC's products are constructed mainly of recyclable metal and plastic. The main
materials used are listed below.

Chassis

Frame Metal, powder-coated

Wheels Rubber

Fixed parts Metal

Hose connections Metal, aluminium

Hoses Plastic, PUR/PVC

Grinding head

Lower cover Metal, aluminium

Cover Metal, powder-coated

External plate and steel components Metal, powder-coated

Belts Rubber and polyamide

Steering grinding cover Plastic, ABS

Other components Untreated steel

Electrical system

Cables Copper conductors with Neoprene and PVC coating

Motor Metal, cast iron, aluminium and copper

Enclosure electrical cabinet Metal, stainless

Plastic components can be recycled by sorting as hard plastics. Electronics can be
deposited as electronic waste. Machines or machine components can also be sent back
to HTC Sweden AB. For recycling and scrapping of components, see the applicable
national regulations for each country.

HTC GL
270/400/450/550 Warranty and CE marking

1.0 39

9 Warranty and CE marking

9.1 Warranty

This warranty only covers manufacturing defects. HTC bears no responsibility for
damage that arises or occurs during transportation, unpacking or use. In no instance and
under no circumstances shall the manufacturer be held responsible for damage and
defects caused by incorrect use, corrosion or use outside the prescribed specifications.
The manufacturer is not responsible for indirect damage or costs under any
circumstances. For complete information on the manufacturer's warranty period, see
HTC's current warranty terms.

Local distributors may have special warranty terms specified in their terms of sale,
delivery and warranty. If there is any uncertainty regarding warranty terms, please
contact your retailer.

9.2 CE marking

CE marking of a product guarantees its free movement within the EU area in
accordance with EU regulations. CE marking also guarantees that the product fulfils
various directives (the EMC Directive and other possible requirements in so-called
directives for new procedures in accordance with these regulations). This machine
carries the CE mark in accordance with the Low Voltage Directive (LVD), the
Machinery Directive and the EMC Directive. The EMC Directive states that electrical
equipment must not disturb its surroundings with electromagnetic radiation and that it
must also be immune to electromagnetic interference in the surroundings.

This machine is classified for use in environments such as heavy industry, light industry
and homes. See the Manufacturer’s Declaration of Conformity, which shows that the
machine is harmonised with the EMC Directive.