HTC HTC 800 RXP User manual

User Manual
HTC 800 RXP
EN

Contents
1 Introduction
1.1 Product description................................................ 3
1.2 Intended use.......................................................... 3
1.3 Product overview....................................................3
1.4 Control panel overview...........................................4
1.5 Remote control unit overview.................................5
1.6 Symbols on the product......................................... 5
1.7 Display................................................................... 6
1.8 Type plate.............................................................. 7
1.9 Product liability....................................................... 7
2 Safety
2.1 Safety definitions....................................................8
2.2 General safety instructions.....................................8
2.3 Safety instructions for operation.............................9
3 Safety instructions for maintenance
4 Propane safety
4.1 Introduction.......................................................... 12
4.2 Emission...............................................................12
4.3 Fire/Explosion...................................................... 12
4.4 Environment......................................................... 12
4.5 Propane cylinder.................................................. 12
5 Operation
5.1 Introduction.......................................................... 13
5.2 To adjust the handle.............................................13
5.3 To adjust the drive lock on the wheels................. 13
5.4 To use the support wheel.....................................14
5.5 To use the weights............................................... 14
5.6 To access the grinding tools................................ 15
5.7 To fit the grinding tools.........................................15
5.8 To remove the grinding tools................................15
5.9 To move the machine manually........................... 15
5.10 To use the remote control to move the
machine .....................................................................16
5.11 To operate the grinder manually........................ 16
5.12 To operate the grinder with the radio control
unit............................................................................. 16
5.13 Emergency stop................................................. 17
5.14 To make operation easier.................................. 17
6 Maintenance
6.1 Introduction.......................................................... 18
6.2 Maintenance schedule......................................... 18
6.3 To replace the batteries in the remote control
unit............................................................................. 19
6.4 To examine the oil level....................................... 19
6.5 To clean the oil cooler.......................................... 19
6.6 To change the oil..................................................19
6.7 To change the oil filter..........................................20
6.8 To change the Air Filters...................................... 20
6.9 To clean or change the spark plug.......................21
7 Troubleshooting
7.1 Troubleshooting................................................... 22
8 Transportation, storage and disposal
8.1 Transportation...................................................... 24
8.2 Storage.................................................................24
8.3 Disposal............................................................... 24
9 Technical data
9.1 Technical data , HTC 800RXP............................. 25
9.2 Electrical system.................................................. 26
10 Warranty
2888 - 001 -

1 Introduction
1.1 Product description
The product is a propane powered surface grinder that
can be used to grind, strip, clean and polish horizontal
surfaces. Only use P95 propane.
1.2 Intended use
Only use the product to grind and polish natural stone,
terrazzo, concrete, or other materials approved by HTC.
Do not use the product for other tasks.
1.3 Product overview
450
MENU
SET
630 810RPM
0 1I
0
II
S
1
2
3
8
9
5
6
10
11
14
4
716
12
15
13
17
18
1. Handle
2. Handle lock
3. Weights
4. Locking pin, weights
5. Lifting eye
6. Engine
7. Locking pin, wheel
8. Floating grinding cover outer movable section
9. Floating grinding cover inner fixed section
10. Control panel
11. Extraction connection
12. Main power switch
13. Propane connection
14. Control cabinet
15. Propane cylinder (Use only P95 propane)
16. Drive motor box
17. Support wheel
18. Remote control unit
888 - 001 - Introduction - 3

1.4 Control panel overview
450
MENU
SET
630 810 RPM
01 I
0
II
S
11
1
2
7
6
4
3
89
10
5
WARNING: When you do not use the machine
turn the START KEY to 0 and turn the knob
RADIO ON/OFF to 0.
1. START KEY SWITCH
Start key to start/stop the machine’s functions:
•0: OFF
• I: Electric power ON
• II: Ignition ON
• S: Start the engine.
2. IGNITION - Standby indicator
The led bulb comes on when the the start key is in
position II.
3. RADIO ON/OFF
Turn the knob to I to start the radio signal to the
radio control unit.
4. COM ERROR - Communication error indicator
The led comes on if there is no connection between
the machine and the radio control unit.
5. RADIO ENABLED - Radio control indicator
The led comes on when the knob “Radio ON/OFF” is
turned to “ON”.
6. EM-STOP - Emergency stop switch
If an emergency occurs, press the EM - stop to stop
the machine.
7. THROTTLE
Use one of the methods that follows to adjust the
throttle of the engine.
• Turn the knob.
• Push the center button on the knob and pull the
knob rearward.
8. MENU BUTTON
Press the button to toggle between the settings in
the display.
9. DISPLAY
See the section "Display" for detailed information.
10. SET BUTTON
Press the button to adjust the selected menu item.
11. RPM GUIDE
A guide that shows the speed interval of the grinding
discs.
• Yellow: Idle. Below 1400 rpm.
• Red: The cluch slips. Do not operate the
machine between 1400 - 2000 rpm.
• Green: Correct rpm to use when operating the
machine. 2000 - 3600 rpm.
Note: Always attach the machine to a winch when you
transport the machine on a slanted surface.
4 - Introduction 888 - 001 -

1.5 Remote control unit overview
HTC Remote Control
L R
FWD
RWD
ON
100%
0%
STOP
FREQ
OFFSET SPEED
GRINDING SPEED
• Reset all controls and press
to start radio control connection
NOTE:
EM-STOP
min max
L R
STEERING 1
11
2
6
8
4
3
7
9
10 5
1. STEERING
To steer the machine to the right (R) and to left (L).
2. FREQ - Frequency button
Push the button to change the frequency of the radio
control.
3. Not in use
4. ON/STOP - Motor ignition
Move the switch to ON to activate the ignition to the
motor. Move the switch to STOP to stop the engine.
5. BATTERY COMPARTMENT
Holds the batteries that power the radio control unit.
6. EM-STOP
Push the button to break the radio contact between
the radio control unit and the machine’s receiver.
This action stops the machine immediately. Rotate
the button clockwise to reset.
7. SPEED (min - max)
Turn the knob to adjust the propulsion speed in the
direction of movement.
8. FWD/RWD
Move the switch up to move the machine forward
(FWD) or down to move the machine backwards
(RWD).
9. OFFSET (L - R)
Turn the knob to the left (L) or the right (R) to adjust
for any tendency to veer.
10. START RADIO COMMUNICATION
Press the button to start the radio communication
between the radio control unit and the machine’s
receiver.
11. DISPLAY/CHANNEL INFO
Two dots blink with a red light when the radio control
unit is active. The displays also shows information
on the radio channel and any error messages. If the
letter “L” appears and blinks rapidly, change or
recharge the batteries. The radio control unit is
active for about 30 min after the “L” appears for the
first time.
Note: When a “L” appears in the display, take the radio
control unit to a safe place and switch off the unit. Install
two charged AA batteries 1.2 V NiMH, or alternatively
two normal, non-rechargeable 1.5 V AA batteries.
1.6 Symbols on the product
Warning: Not careful or incorrect use can
result in injury or death for the operator or
others.
Please read the operator's manual
carefully and make sure that you
understand the instructions before use.
Always use approved ear protection.
Always use an approved breathing mask.
888 - 001 - Introduction - 5

Always use approved protective boots
Risk of fire. Only us commercially
available floor cleaners and waxes
intended for machine application.
Risk of explosion. Grinding can cause an
explosive mixture of fine dust and air.
Only use a grinding machine in a area
with good airflow.
Use only in areas with good airflow. Take
precautions against exposure to carbon
monoxide (CO) emissions.
1.7 Display
450
MENU
SET
630 810 RPM
rpm
1.7.1 RPM
The display shows the rpm of the engine.
• Idling: 0 - 1400 rpm.
• Operating range: 2000 - 3600 rpm.
CAUTION: Do not run the machine between
1400 - 2000. The clutch can slip.
1.7.2 Clock
The display has a clock.
• The clock can show current time. Press MENU once
and use SET button to change the time. Press and
hold the MENU button to return to mainpage.
• The clock can show the total runtime. Press the
MENU button once.
• The clock can show time to next scheduled service.
Press and hold the MENU button until the symbol
SUC shows.
•
1.7.3 Warning
The display shows warning symbols.
• Low battery warning. The display shows the symbol
LOU and a warning triangle.
• Service warning. The display shows the symbol
SUC and a warning triangle.
1.7.4 Display settings
The MENU button and the SET button adjusts the
settings on the display.
• Press the MENU button to toggle through the
settings.
• Press and hold the MENU button to activate the
setting.
• Use the SET button to adjust the setting.
• Press the MENU button once to lock the setting.
• Press and hold MENU to return to mainpage.
Note: The display returns to the mainpage if inactive
during 10 seconds.
1.7.5 Display menu
Use the MENU button and the SET button to adjust the
settings on the display.
Menu items Explanation and basic
settings
Total runtime Displays total runtime.
Time to next service Press and hold MENU to
reset the interval after
service.
Max rpm Shows the max rpm used
during last work session.
Ignition Set to "1P1r".
RPM limit 2000 - 3600 rpm
RPM warning Set to "OFF".
Service warning Set to 100h.
Voltage warning Set to 11,0V.
Battery voltage Shows UOL and voltage in
V.
Reset to factory settings Do not use.
6 - Introduction 888 - 001 -

1.8 Type plate
HTC Sweden AB
P.O Box 69. SE-614 22 Söderköping. Sweden
Phone [phone] Fax [phone]
Internet www.htc-floorsystems.com Made in Sweden
Part no:
Serial no :
MFG Date:
Model:
Voltage :
Rated Current :
Power :
Frequency :
Weight :
Max gradient:
Enclosure :
1. Model
2. Part number
3. Serial number
4. MFG date
5. CE
6. Power (kW)
7. Voltage (A)
8. Rated current (A)
9. Frequency (Hz)
10. Weight (kg)
11. Max gradient
12. Enclosure
1.9 Product liability
As referred to in the product liability laws, we are not
liable for damages that our product causes if:
• the product is incorrectly repaired.
• the product is repaired with parts that are not from
the manufacturer or not approved by the
manufacturer.
• the product has an accessory that is not from the
manufacturer or not approved by the manufacturer.
• the product is not repaired at an approved service
center or by an approved authority.
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.
888 - 001 - Introduction - 7

2 Safety
2.1 Safety definitions
Warnings, cautions and notes are used to point out
specially important parts of the manual.
WARNING: Used if there is a risk of injury or
death for the operator or bystanders if the
instructions in the manual are not obeyed.
CAUTION: Used if there is a risk of damage to
the product, other materials or the adjacent area
if the instructions in the manual are not obeyed.
Note: Used to give more information that is necessary in
a given situation.
2.2 General safety instructions
WARNING: Read the warning instructions that
follow before you use the product.
• The dust from the grinder harmful to breathe. Follow
local regulations and use breathing protection.
• Only use the product outdoors or in an area with
good airflow.
• Use a CO dosimeter when you operate the product.
• This product is dangerous if used incorrectly or if
you are not careful. Injury or death can occur if you
do not obey the safety instructions.
• Always be careful and use your common sense. If
you are not sure how to operate the product in a
special situation, stop and speak to your HTC dealer
before you continue.
• Keep in mind that the operator will be held
responsible for accidents that involve other persons
or their property.
• Keep the product clean. Make sure that you can
clearly read signs and decals.
• Do not let a child operate the product.
• Do not let a person, without knowledge of the
instructions, operate the product.
• Always monitor a person, with decreased physical
capacity or mental capacity, that uses the product. A
responsible adult must be there at all times.
• Do not use the product if you are tired, ill, or under
the influence of alcohol, drugs or medicine. This has
a negative effect on your vision, alertness,
coordination and judgment.
• Do not use the product if it is defective.
• Do not change this product or use it if it is possible
that it has been changed by others.
• The machine may only be used or repaired by
personnel who have received the appropriate
theoretical and practical training and who have read
this manual.
• Always make sure that a dust extractor is connected
to the grinder during dry grinding to prevent
exposing as far as possible operators, people in the
vicinity, the grinder and other equipment to dust
particles. Exposure to dust particles can cause
personal injury and also damage to physical
equipment.
• The operator must never leave the machine
unattended.
• When working on an elevated surface where there is
a risk of falling, the edges of the surface must be
secured. The values for the machine’s thrust and
load capacity as well as the driving speed are given
in the table for the machine’s technical data in the
chapter “Technical Data”.
• When wet grinding (if the machine has that feature),
the water tank must be filled with water. Only use
cold water with no chemical additives.
• Do not use the product above 2000 m above the sea
level.
2.2.1 Work area safety
WARNING: Read the warning instructions that
follow before you use the product.
• Secure the area around the machine. No
unauthorised persons should be within a 15-metre
radius of the machine. If loose objects get under the
grinding head, these may be flung out and cause
personal injury.
• Never use the machine in an environment where
there is a risk of explosion or fire. Familiarise
yourself with the fire protection instructions for the
working area and follow them.
• Remove objects from the work area before you use
the product.
• Objects that hit against the cutting equipment can
eject and cause damage to persons and objects.
Keep bystanders and animals at a safe distance
from the product.
• Never use the product in bad weather such as fog,
rain, strong winds, intense cold and risk of lightning.
To use the product in bad weather or in moist or wet
locations is tiring. Bad weather can cause
dangerous conditions, such as slippery surfaces.
• Look out for persons, objects and situations that can
prevent safe operation of the product.
• Be careful when you go near hidden corners and
objects that prevent a clear view.
2.2.2 Work safety
WARNING: Read the warning instructions that
follow before you use the product.
• Make sure that there are fire extinguishers close to
the work area.
8 - Safety 888 - 001 -

• Use personal protective equipment. See Personal
protective equipment on page 9 .
• Do not operate the product in rain or wet conditions.
The risk of electrical shock increases if water enters
the product.
• Do not operate the product unless the tools and all
covers are attached correctly. An incorrectly
attached tool can come loose and cause personal
injury.
• Do not perform maintenance on the product when
you operate the product.
• If the discs hits an object or if vibrations occur, stop
the product immediately. Stop the motor, turn the
main power switch to OFF. Examine the product for
damages. Repair damages or let an authorised
service agent do the repair.
• Keep your hands and feet away from the rotating
discs.
• Do not tilt the product when the motor is started.
• Never let the product stay out of view with the motor
started. Stop the motor and make sure that the main
power switch is OFF.
2.2.3 Emission safety module
The Propane engine has an Emission Safety Module
which monitors the exhaust emissions. If, the engine
starts to produce too high emission levels the engine
automatically stops. The red led bulb on the emission
module comes on before the engine stops. If, this
problem continues the fuel regulator needs adjustment
by a approved technician. The red led bulb usually
comes on when the engine starts.
EMISSION
WARNING
LIGHT
2.3 Safety instructions for operation
WARNING: Read the warning instructions that
follow before you use the product.
• Only start the machine with the grinding head
lowered.
• 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.
• The machine may only be used and moved on
horizontal surfaces. There is a risk of crush injuries if
the machine starts to roll.
• Do not use the emergency stop switch to stop the
machine, except in emergencies.
• The machine cannot be moved manually if the drive
wheels are locked and the radio control activated.
• Never deactivate the radio control function when you
have stopped the machine on a sloping surface
during loading, since the machine can start to move.
2.3.1 Personal protective equipment
WARNING: Read the warning instructions that
follow before you use the product.
• Personal protective equipment cannot fully prevent
injury but it decreases the degree of injury if an
accident does occur. Let your dealer help you select
the right equipment.
• Use heavy-duty slip-resistant boots or shoes. Do not
use open shoes or go with bare feet.
• Use heavy, long pants.
• Use protective gloves when necessary, for example
when you attach, examine or clean the cutting
equipment.
• Use a respiratory mask.
• Always wear safety glasses or eye protection while
you operate the product or do maintenance or
repairs.
• Always use approved ear protection while you
operate the product. Noise for a long period can
cause noise-induced hearing loss.
• Do not wear loose fitting clothing or jewelery that
can get caught in moving parts.
2.3.2 Safety devices on the product
WARNING: Read the warning instructions that
follow before you use the product.
• Do not use a product with defective safety devices.
• Do a check of the safety devices regularly. If the
safety devices are defective, speak to your HTC
service agent.
• Make sure that the EM-stop on the control panel and
the remote control unit functions correctly before you
operate the product.
2.3.3 Battery safety
WARNING: Read the warning instructions that
follow before you use the product.
• Risk of electrical shock. Do not connect the battery
terminals to keys, coins, screws or other metal. This
can cause a short circuit of the battery.
• Keep the batteries away from sunlight, heat or open
flame. The battery can explode and cause burns
and/or chemical burns.
888 - 001 - Safety - 9

• Keep the batteries away from rain and wet
conditions.
• Keep the batteries away from microwaves and high
pressure.
• Do not use a defective or damaged battery.
• Keep batteries in storage away from metal objects
such as nails, coins, jewellery.
• The battery, that drives the motors for the machine’s
drive wheel, charges continuously when you operate
the machine.
10 - Safety 888 - 001 -

3 Safety instructions for maintenance
WARNING: Read the warning instructions that
follow before you use the product.
• To prevent accidental start during maintenance, turn
the main power switch to OFF.
• Do the maintenance work correctly to increase the
lifetime of the product and decrease the risk of
accidents. Let an approved service agent do the
professional repairs. Speak to your nearest service
agent for more information.
• Only do the maintenance work written in this
operator's manual. More extensive work must be
done by an approved service agent.
• Do not clean the machine using a high-pressure
washer. Otherwise, moisture may penetrate
electrical elements and damage the machine’s drive
system.
• During electro-welding work on the machine, the
radio receiver must always be disconnected to avoid
damage to the receiver’s electrical system.
• Let your service agent regularly examine the product
and make necessary adjustments and repairs.
• Replace damaged, worn or broken parts.
• Obey the instructions for how to change
accessories. Only use accessories from the
manufacturer.
• When not in operation, keep the product in a dry,
indoor and locked area. Make sure that children and
persons that are not approved cannot get access to
the product.
888 - 001 - Safety instructions for maintenance - 11

4 Propane safety
4.1 Introduction
WARNING: Read the warning instructions that
follow before you use the product.
CAUTION: Read the Propane Safety Manual
before you use the product.
Propane is a flammable gas. Propane can explode if the
proper cautions are not heeded. Propane is odorized
with an agent having a distinct odor that is recognizable
at very low concentrations. This helps in identifying
leaks, even when they are small.
The two greatest hazards with propane powered floor
care machines are
• Emission
• Fire/explosion
4.2 Emission
Propane can cause Carbon Monoxide Poisoning (C0).
CO can be lethal within as little as 30 minutes exposure
at 3,000 parts per million (ppm) concentration.
Before operating a machine using propane gas you
must be trained and certified in proper handling and
operating procedures.
If you smell propane while operating the machine:
1. Stop the engine.
2. Shut off the service valve on the propane cylinder.
3. Move the product to a well-ventilated area.
4. Remove the cylinder from the machine and take it
outside the building.
5. If the cylinder is leaking, contact an approved repair
shop to determine the cause of the leak and have
the shop, not you, repair it.
4.3 Fire/Explosion
Leaking propane containers or hoses can cause fire.
Propane vapor concentrated or confined to a small,
restricted space may explode or ignite.
Make sure that the propane container is undamaged
before attaching it to the machine.
If a fire occurs while the machine is being operated do
the following:
1. Stop the motor.
2. Shut off the service valve on the propane cylinder, if
it is possible. Be careful not to get burned.
3. Move the machine outside, if it is possible. If it is not
possible, move it to a well-ventilated area away from
flammable materials. Do not attempt to extinguish
the flame from a gas leak. If you do, the gas will
build up in the area and could reignite. Starve the
fire by shutting off the supply of gas.
4. Have the machine and cylinder inspected before
using them again.
4.4 Environment
Only use the product outdoors.
4.5 Propane cylinder
• When not in use, propane cylinders always should
be stored outside in an upright position in a secure,
tamperproof, steel mesh storage cabinet. Make sure
that you store the propane cylinders according to
national regulations.
• Make sure that the cylinder are securely fastened
and standing in an upright position with the service
valve closed, when transporting a it to a propane
dealer or to a job.
• Only use propane motor fuel cylinder. Do not use
the common household propane cylinder.
• Do not drop a propane cylinder.
• Do not smoke or use a device with an open flame
when handling or transporting propane cylinders.
12 - Propane safety 888 - 001 -

5 Operation
5.1 Introduction
WARNING: Before you operate the product,
you must read and understand the safety
chapter.
5.2 To adjust the handle
WARNING: There is a risk of crush injuries
when adjusting the handle into the desired
position. Make sure the handle lock locks
properly in the desired position.
1. Loosen the handle by turning the handle lock to the
left or the right.
2. Move the handle to the desired position. The handle
locks automatically in the desired position.
3. Make sure that the handle lock returns to the original
position to guarantee that the handle is locked
properly.
5.2.1 Handle positions
3
2
1
1. Position 1
Use this position for transportation.
2. Position 2
Use this position when you tipp the machine (to
change the tools). This position can be used when
you operate the machine with the radio control unit.
3. Position 3
Always use this position when you operate the
product manually. This position can be used when
you operate the machine with the radio control unit.
5.3 To adjust the drive lock on the wheels
The machine has a lock mechanism on each wheel. Use
the drive lock to release or attach the wheels to its drive
motors.
• Release the drive lock to move the machine
manually.
• Lock the wheels to move the machine with the
operating panel or the radio control unit.
Note: During troubleshooting, the wheels can be
released from the drive motors and test driven without
the machine moving.
1. Pull out the locking pin.
2. Turn the locking pin 90 and release it.
To lock the wheels do the instructions in the opposite
sequence.
888 - 001 - Operation - 13

5.4 To use the support wheel
Use the support wheel to make it easy to move the
machine.
1. Fit the support wheel on the chassis.
2. Lock the support wheel with the pin.
3. Rotate the crank on the front of the support wheel to
adjust the height. Make sure that the machine tilts
and the grinding head hangs completely free of the
surface.
4. Release the drive locks of the wheels. See
To adjust
the drive lock on the wheels on page 13 .
5.5 To use the weights
WARNING: Always make sure that the locking
pins lock properly when the weights are placed
in the desired position.
CAUTION: Fold up the weights during grinding.
Too high grinding pressure causes damage to
the machine and the floor.
The machine has two weights to make it easy to move
the machine’s centre of gravity. Each weight has two
locking pins with which the weights can be adjusted and
locked in three positions; forward, up or backwards.
•Position 1
Move the weights forward to apply a greater
pressure to the grinding discs which increases the
grinding effect.
•Position 2
Move the weights to its upright position for normal
grinding and transport.
•Position 3
Move the weights backward when you prepare to
change the tools. Use the backward position when
you use tools with high removal rate (T-RexTM).
14 - Operation 888 - 001 -

5.6 To access the grinding tools
WARNING: Before you change the tools, you
must read and understand the safety chapter.
1. Set the handle to the rear position.
2. Fold the weights back and place a foot against one
of the weights.
3. Tip the machine backwards carefully, until the
weights reach the floor.
4. Tip the machine further back, until all of the machine
reaches the floor.
5.7 To fit the 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.
2. Lock the grinding tool into the tool holder by giving it
a few light taps with a rubber hammer.
5.8 To remove the grinding tools
1. Remove the grinding tool by giving it a few light taps
with a rubber hammer so the locking mechanism
releases.
2. Pull out the tool.
5.9 To move the machine manually
1. Turn the power switch to off.
2. Release the drive lock on the wheels. See To adjust
the drive lock on the wheels on page 13 .
888 - 001 - Operation - 15

3. Attach the support wheel. See To use the support
wheel on page 14 .
4. Move the machine with the handle.
5.10 To use the remote control to move the
machine
1. Lock the drive lock on the wheels. See
To adjust the
drive lock on the wheels on page 13 .
2. Turn off the propane.
3. Turn the START KEY SWITCH to I.
4. Turn the RADIO ON/OFF switch to I.
5. Press the START RADIO COMMUNICATION button
on the remote control unit. The red led bulb (COM
ERROR) on the control panel goes out, if the
connection is successful.
6. Use the FWD/RWD switch and STEERING knob to
move the machine.
5.11 To operate the grinder manually
CAUTION: The emergency stop switch, (EM-
Stop) must only be used in an emergency.
Usage may decreases the lifespan of the
machine’s electrical components.
Note: Drive the machine manually in difficult to navigate
spaces.
The operator pushes the machine forward across the
floor surface and operates the machine with the control
panel.
5.11.1 To start
1. Release the drive lock on the wheels. See
To adjust
the drive lock on the wheels on page 13 .
2. Connect the propane cylinder to the propane hose.
Make sure that the propane tank and the hose is
properly connected and that the hose is properly
connected to the fuel lockoff safety valve on the
engine.
3. Turn the propane cylinder valve counter clockwise
until it stops to activate the flow of the propane.
4. Examine the connections for propane leaks.
Propane emits a foul “garbage” odor. If a leakage
occurs do not continue to start the machine. Fix the
leakage before you start the machine.
5. Turn the main power switch to "ON".
6. Release the EM-stop.
7. Turn the START KEY SWITCH to II.
8. Make sure that the RADIO SWITCH is in its “0”
position.
9. Turn the START KEY SWITCH to the right to start
the engine. Do not try to start the engine for more
than 5 seconds at a time. Excessive starter running
may result in damage to the starter. The engine can
require more than one start attempt.
10. Before you operate the product, wait 3 - 5 minutes
and let the engine become warm. Idle at max. 1400
rpm.
5.11.2 To stop
1. Push the THROTTLE knob. This will set the engine
to the idle position.
2. Turn the propane cylinder valve clockwise until it
stops to turn off the propane supply to the engine.
Allow the engine to burn all the fuel in the line.
3. Turn the START KEY SWITCH to "0".
4. Turn the main power switch to "OFF".
5.12 To operate the grinder with the radio
control unit
WARNING: Do not leave the machine
unattended when operating using the radio
control unit.
Note: Drive the machine manually in difficult to navigate
spaces.
When you use the radio control unit to operate the
machine, the machine moves forward with the aid of the
motors in the drive motor box.
5.12.1 To prepare the radio control unit
Note: Rechargeable batteries must be fully charged
before they are used for the first time.
1. Remove the screws on the battery cover on the
radio control unit.
2. Put two charged AA batteries 1.2 V NiMH, or two
non-rechargeable 1.5 V AA batteries, in the battery
conpartment.
3. Close the cover and tighten the screws.
16 - Operation 888 - 001 -

5.12.2 To start
Note: After the RADIO SWITCH has been activated,
you have 30 seconds to connect the radio control unit to
the machine.
1. Lock the drive lock on the wheels. See To adjust the
drive lock on the wheels on page 13 .
2. Connect the propane cylinder to the propane hose.
Make sure that the propane tank and the hose is
properly connected and that the hose is properly
connected to the fuel lockoff safety valve on the
engine.
3. Turn the propane cylinder valve counter clockwise
until it stops to activate the flow of the propane.
4. Examine the connections for propane leaks.
Propane emits a foul “garbage” odor. If a leakage
occurs do not continue to start the machine. Fix the
leakage before you start the machine.
5. Turn the main power switch to "ON".
6. Release the EM-stop.
7. Turn the START KEY SWITCH to II.
8. Turn the RADIO SWITCH to "I". The red and green
leds bulbs comes on.
9. Make sure that the FWD/RWD switch is in its neutral
position.
10. Press and hold the START RADIO
COMMUNICATION button on the remote control
unit. Press and hold the button util the COM ERROR
light (red led) on the control panel turns off.
11. Put the ON/STOP switch is in its "ON" position.
12. Turn the START KEY SWITCH to the right to start
the engine. Do not try to start the engine for more
than 5 seconds at a time. Excessive starter running
may result in damage to the starter. The engine can
require more than one start attempt.
13. Before you operate the product, wait 3 - 5 minutes
and let the engine become warm. Idle at max. 1400
rpm.
14. Adjust the rotation speed of the discs. Set the
rotation speed to 2000 rpm or more.
15. Set the FWD/RWD switch to FWD to start grinding.
5.12.3 To stop
1. Put the FWD/RWD switch to neutral on the remote
control unit.
2. Reduce the throttle to idle speed (1200 rpm).
3. Turn the propane cylinder valve clockwise until it
stops to turn off the propane supply to the engine.
4. Allow the engine to burn all the fuel in the line.
5. Put the ON/OFF switch to STOP on the remote
control unit
6. Press the EM-stop on the remote control unit.
7. Turn the START KEY SWITCH to "0".
8. Press the EM-stop on the control panel. Always do
this step when shutting off the machine.
9. Turn the main power switch to "OFF".
5.12.4 To change the radio frequency
CAUTION: If the error code “Jt” is shown on the
display, immediately contact the HTC Service
Centre for instructions.
If several machines are used in the same workplace,
there can be interference with the radio communication.
1. Stop the machine. See To stop on page 17 .
2. Press and hold the RADIO COMMUNICATION
button to start radio communication.
3. Press the frequency button “FREQ”. The machine’s
radio receiver automatically searches for the new
frequency, the number of the selected frequency
channel is shown briefly on the radio control unit’s
display.
4. Release the RADIO COMMUNICATION button to
start the radio communication.
5. Start the machine. See To start on page 17 .
5.13 Emergency stop
• If you operate the machine with the control panel,
press the EM STOP on the control panel.
• If you operate the machine with the remote control
unit, press the EM STOP on the remote control unit.
5.14 To make operation easier
Put the suction hose on the floor as shown in the
illustration. This procedure makes sure that the hose is
not in the work area or in the path of the machine. If, you
use this procedure, it is not necessary to stop the
machine to change the position of the hose.
888 - 001 - Operation - 17

6 Maintenance
6.1 Introduction
WARNING: Before you do maintenance, you
must read and understand the safety chapter.
For all servicing and repair work on the product, special
training is necessary. Repair work must be carried out
by a HTC Service Centre, which has trained service
personnel and uses HTC original parts and accessories.
We guarantee the availability of professional repairs and
servicing. Only original tools and spare parts from HTC
may be used. Otherwise, neither the CE marking nor the
warranty will be valid. If your dealer is not a service
agent, speak to them for information about the nearest
service agent.
6.2 Maintenance schedule
The maintenance intervals are calculated from daily use
of the product. The intervals change if the product is not
used daily.
Daily Weekly Monthly*
Examine the engine oil level. X
Change the engine oil. X
Clean the machine and the remote control unit. X
Examine the grinding tools. Abnormal or uneven wear may indicate a damaged
grinding holder. X
Examine the tool holder and grinding holder to make sure that there are no dam-
ages or cracks. Replace the parts if there is any damage. X
Remove any residues of building material from the radio control unit. X
Examine the connection of hoses and cables. Adjust them if it is necessary. X
Examine the fastening between chassis and grinding head – gap, wear, dry
cracks. Replace the bushes, if necessary. X
Examine the grinding holders. If the grinding holders oscillate or wobble signifi-
cantly, they are damaged. X
Examine the upper belt.Turn the large disc.If the disc rotates freely the belt is
broken. Replace the belt if it is damaged. X
Examine the grinding cover – seal, wear, cracks, brush list, extraction, hoses,
couplings. X
Examine the seals on the electrical cabinet. X
Examine the electrical cabinet for wear. Make sure the electrical cabinet is secur-
ly attached to the machine. X
Examine the radio's rubber bellows on the joystick and switches. Replace the
bellows, if it is necessary. X
Examine the warning decal. Replace if it is necessary. X
Tighten anything that may have vibrated loose. X
Remove the grinding cover and examine for damages. X
Scrape and vacuum-clean the parts shielded by the grinding cover. X
Test run and listen for any dissonance from the bearings. X
Examine the radio control unit’s EM-STOP button. Make sure it functions correct-
ly. X
Examine the control panel’s EM-STOP button. Make sure it functions correctly. X
Examine the air filter. Replace the air filter, if it is necessary. X
* Or every 100 hours of use.
18 - Maintenance 888 - 001 -

6.3 To replace the batteries in the remote
control unit
Replace the batteries in the remote control unit when "L”
appears in the display and blinks quickly. See To
prepare the radio control unit on page 16 .
6.4 To examine the oil level
WARNING: Hot engine oil can cause injury.
Make sure the engine is warm, not hot, before
you remove the oil.
Examine the oil level every day before you operate the
machine.
Table 1: Engine oil capacity
FX801V / FX751V
2.1 L (2.2 US·qt) [when oil
filter is not removed]
2.3 L (2.4 US·qt) [when oil
filter is removed]
1. Remove the oil gauge from the tube.
ADD FULL
2. Examine the oil level. Make sure that the oil level is
between "add" and "full".
6.5 To clean the oil cooler
Check and clean oil cooler fins every 100 hours.
1. Clean dirt off the fins with a brush or with
compressed air.
A
6.6 To change the oil
WARNING: Hot engine oil can cause injury.
Make sure the engine is warm, not hot, before
you remove the oil.
WARNING: Engine oil is a toxic substance.
Make sure that you obey national regulations
when you dispose the engine oil.
Note: Before you remove the oil filter, put a suitable
container under the filter.
Change the oil every 100 hours of operation.
1. Operate the machine to make sure that the engine
oil is warm.
2. Make sure that the machine is on a flat surface.
3. Stop the machine.
4. Remove the oil drain plug (A) and drain the oil into a
suitable container while engine is warm.
A
5. Attach the oil drain plug.
6. Fill the engine with oil and examine the oil level
888 - 001 - Maintenance - 19

6.7 To change the oil filter
WARNING: Hot engine oil can cause injury.
Make sure the engine is cool before you remove
the oil filter.
WARNING: Engine oil is a toxic substance.
Make sure that you obey national regulations
when you dispose the engine oil.
Note: Before you remove the oil filter, put a suitable
container under the filter.
Change the oil filter every 200 hours of operation.
1. Drain the engine oil into a suitable container.
2. Rotate the oil filter counterclockwise and remove the
oil filter (A).
A
B
3. Put clean engine oil on the seal of new filter.
4. Attach the new filter. Rotate the filter clockwise until
the seal touches the mounting surface (B). Then
rotate the filter 2/3 turn more.
5. Fill the engine with engine oil.
6. Run the engine for 3 minutes. Stop the engine, and
examine the oil filter for leakage.
7. Add oil to compensate for oil level drop due to oil
filter capacity.
6.8 To change the Air Filters
Note: Do not run the engine with the air filters removed.
Note: Do not wash the air filterss. Do not use oil to clean
the air filters. Do not use pressurized air to clean the
airfilters.
Note: Operating in dusty or dirty condition may require
more frequent maintenance.
Do not clean the air filters. Replace each air filter
according to the maintenance schedule.
1. Open the cap (F) to dust ejector valve to remove
dust and water from the air filter body (C).
A
B
F
C
2. Unfasten the 2 clamps (A) and remove the case (B).
3. Remove the primary air filter (D). Remove the
secondary air filter (E).
D
E
4. Put the new air filters in the air filter body.
5. Put the case on the air filter body and fasten the
clamps.
20 - Maintenance 888 - 001 -