NU CT424 User manual

Operator's Manual Edging Power Trowel
CT424 & CT430
Unit 2 Low Farm Low Road, Morley St Botolph, Wymondham, United Kingdom, NR18 9BU
[email protected]
01953 711952
www.nuequipment.co.uk

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Original instructions This Operator’s Manual presents the original instructions. The original
language of the Operator’s Manual is English.

3
Foreword
This manual contains important instructions for this machine. These instructions must be followed
during installation, operation, and maintenance of the machines.
This manual provides information and procedures to safely operate. For your own safety and to
reduce the risk of injury, carefully read, understand, and observe all instructions described in this
manual.
We reserves the right to change any of the contents in this manual without notice.
Warranty
Our products are covered by warranty for a period of twelve (12) months from the date of
purchase against defects in material or workmanship provided that:
The product concerned has been operated and maintained in accordance with the operating
instructions.
Has not been damaged by accident, misuse or abuse.
Has not been tampered with or repaired by any unauthorized person.
Any evidence of failure to meet these conditions may result in a denial of the warranty claim.
The owner is responsible for the cost of transportation to and from the authorized repairer and the
unit is at the owners risk while in transit to and from the repairer.
Impact damage is not covered under warranty. Clutches are not covered under any warranty.
Engines are officially guaranteed by engine manufacturer. Please refer to the annex for engine
warranty.

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Table of Contents
Foreword 3
Warranty 3
1. SAFETY INFORMATION.………………………………………………………………….. .5
1.1 Operating Safety………………………………………………………………………….....5
1.2 Operator Safety while using Internal Combustion Engines……………………………..6
1.3 Label Locations………………………………………………………………………………6
1.4 Safety and Operating Labels……………………………….…………………………….7-8
2. OPERATION …………………………………………………………….……………………... 9
2.1 Operating Principle………………………………………………………………………………..9
2.2 Application – Standard Feature………………………………………………………………….9
2.3 Delivery Checks ……………………………………………………………………….………….9
2.4 Unfolding the Handle.……………………………………………..………………….………….10
2.5 Before Starting……………………………..……………………..……………………..……….10
2.6 To Start …………………………………………………………………………………………..11
2.7 To Stop ……………………………………………………………….…………………………. 11
2.8 Initial Operation………………………………………………………………………….…...11
2.9 Finishing Operation………………………………………………………..……….……….11
3. MAITENANCE ……………………..………………………………………………...…..……12
3.1 Periodic Maintenance Schedule………………………………………..………………....12
3.2 Lubrication…………………………………………………………………………..…..……13
3.3 Transporting Trowels…………………………………………………………………......……...13
3.4 Trouble Shooting …………………………………………………..………………………….14-15
4. TECHNICAL DATA ………………………...………………………………….…..……………16
4.1 Technical Specification…………………………………………………………………………….16
4.2 Dimension …………………………………………………………………………….……………16
4.3 Sound Specification ……………………………………………………………………………….17
4.4 Vibration Specification …………………………………………………………………………….17

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1. SAFETY INFORMATION
1.1 Operating Safety
Only trained personnel are permitted to start, operate, and shut down the machine.
They have received instruction on how to properly use the machine and are familiar
with required safety devices
The machine must not be accessed or operated by children and people impaired by
alcohol or drugs.
NEVER operate this machine in application for which it is not intended.
NEVER allow anyone to operate this equipment without proper training. People
operating this equipment must be familiar with the risks and hazards associated with
it.
NEVER operate the machine with the beltguard missing. Exposed drive belt and
pulleys create potentially dangerous hazards that can cause serious injuries.
DO NOT allow anyone to stank or lean on the unit during operation.
Do not run the machine indoors or in an enclosed area such as a deep trench unless
adequate ventilation, through such items as exhaust fans or hoses, is provided.
Engine exhaust contains carbon monoxide. This is a poison you cannot see or smell.
Exposure to carbon monoxide can cause loss of consciousness and CAN KILL YOU
IN MINUTES.
Do not operate the machine with unapproved accessories or attachments.
ALWAYS Keep the safety stop switch system in adjustment and good operating
condition at all times. Do not operate the trowel if it does not work properly. Out of
control Trowels can cause serious personal injury and damage to fresh concrete
surfaces. This system will automatically stop the unit if the operator loses control of it
during operation.
ALWAYS make sure the safety stop switch is disengaged (lever in the down position)
before starting the unit. Keep one hand firmly on the handle while starting and do not
let go of the handle during operation.
ALWAYS wear protective clothing appropriate to the job site when operating the
machine.
ALWAYS close fuel valve on engines equipped with one when machine is not being
operated.
ALWAYS store the machine properly when it is not being used. The machine should
be stored in a clean, dry location out of the reach of children.
Read, understand, and follow procedures in the Operator’s Manual before attempting
to operate the machine.

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1.2 Operator Safety while using Internal Combustion Engines
DO NOT smoke when refueling the engine or during any other fuel handling operation.
DO NOT refuel a hot or running engine.
DO NOT refuel the engine near an open flame.
DO NOT spill fuel when refueling the engine.
Do not touch the engine or muffler while the engine is on or immediately after it has
been turned off. These areas get hot and may cause burns.
If fuel is spilled during refueling, wipe it off from the engine immediately and discard
the rag in a safe place. Do not operate the unit if fuel or oil leaks exist-repair
immediately.
NEVER operate this equipment in an explosive atmosphere.
NEVER operate any gas powered equipment in a poorly ventilated or enclosed area.
NEVER perform any work on the unit while it is running. Before working on it, stop the
engine and disconnect the spark plug wire to prevent accidental starting.
Avoid prolonged breathing of exhaust gases.
Avoid contact with hot exhaust systems and engine parts.
Allow engine to cool before performing any repairs or service.
ALWAYS transport and handle fuel only when contained in approved safety
containers.
ALWAYS keep the area around the muffler free of debris such as leaves, paper,
cartons, etc. A hot muffler could ignite the debris and start a fire.

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1.3 Label Location

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1.4 Safety and Operating Labels
Our machines use international pictorial labels where needed. These labels are described
below:
Label
Meaning
DANGER!
Engines emit carbon monoxide; operate only in
well-ventilated area. Read the Operation Manual
for machine information. No sparks, flames, or
burning objects near the machine. Shut off the
engine before refueling. Use only clean, filtered
unleaded gasoline.
WARNING!
Cutting hazard. Always replace blade guard!
`
CAUTION!
Read and understand the supplied Operator’s
Manual before operating the machine. Failure to
do so increase the risk of injury to yourself or
others.
WARNING!
Always wear hearing and eye protection when
operating this machine.

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Label
Meaning
WARNING!
Hand injury if caught in moving belt.
Always replace belt guard.
CAUTION!
Lifting point.
CAUTION!
Use only clean, filtered fuel.
WARNING!
Hot surface!
A nameplate listing the model number and
serial number is attached to each unit. Please
record the information found on this plate so it
will be available if the nameplate lost or
damaged. When requesting service
information, the serial number should be
specified of the unit.

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2. OPERATION
2.1 Operating Principle
The following instructions were compiled to provide you information on how to obtain long
and trouble free use of the machine. Periodic maintenance of the machine is essential.
Read the manual carefully and thoroughly familiarize yourself with the machine and all it’s
functions. Failure to do so may injure yourself or a bystander.
2.2 Application—Standard Features
Your new Power Trowel comes standard with many features to enhance productivity,
performance and safety. Listed below are just a few of these features.
1. Safe Stop Switch—The switching mechanism of this switch should operate freely and should
always be kept in this condition. With the switch in the OFF position, the engine should not
start or run. The purpose of this switch is to stop the engine in a runaway situation, (i.e. the
operator releasing the handle during operation).
2. Adjustable Throttle—Located in a convenient location, this push-pull throttle control can be
set to provide any blade speed from 50 to 130 RPM, and located in place at the desired
operating speed.
3. Bent Arm Adjustable—Allows blades to be adjusted to compensate for bent arms caused by
dropping or mishandling the trowel. Can be easily adjusted on-site for consistent finishing.
4. Heavy Duty Ring Guard—Protects operator and unit while providing lower center of gravity
which contributes to unit stability and performance.
5. Cast Iron Spider—Extra strong for insure alignment. Also contributes to lower center or
gravity for increased trowel performance.
6. Adjustable Handle—Can be positioned to provide comfort and control for any operator’s
height.
7. Tilt Adjustment Knob – adjusts the angle of the blades for different curing stages and
conditions of the concrete. Turning the knob clockwise increases the angle of the blades to
the concrete. Turning the knob counter-clockwise flattens or decreases the angle of the
blades.
2.3 Delivery Checks
Immediately on taking delivery of your new machine and before putting it into service.
Read the operation manual completely—it could save a great deal of unnecessary
expense.Read the engine manual supplied.
Check the general condition of the machine – has it been damaged during delivery?
Check engine oil level.
Check fuel level.
Recommended lubricants are detailed in the Care and Maintenance section.
OPERATION

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2.4 Unfolding the Handle
To unfold and secure the handle assembly:
1. New machine with folded handle.
2. Unfolding the adjustable handle and lock the screw.
3. Straighten the handle and lock the hinge pin.
4. Tighten the adjustable lever to lock the handle in its fully opened position.
2.5 Before Starting
Before starting the machine, check the following items:
All handles are free from grease, oil and dirt.
All control levers are in the neutral position.
All bolted joints are tightened.
Fuel level
Oil level in the engine
Air cleaner maintenance indicator
NOTICE: Check the oil level in the engine and machine before starting. The warranties
are VOID if the machine run without oil.

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2.6 To Start
Before starting the machine must know the location and function of all controls.
Make sure the safety stop switch is in the stop position. If it is not, push the lever down to the stop
position before attempting to start the engine. Open fuel valve under fuel tank (if so equipped),
open throttle approximately half way down and apply choke. Holding unit handle firmly with one
hand, pull the starter rope sharply with the other about (3) times. When engine starts, open choke
and adjust throttle as necessary to keep it running. If engine doesn’t start after (3) pulls, open
choke slightly.
NOTE: These starting instructions are general guidelines only. Since many engine options are
available on our power trowels, consult the ENGINE MANUAL included with the unit for specific
instructions.
OPERATION
2.7 To Stop
Push the safety stop switch down to the stop position. Close throttle all the way, and turn the
engine switch to off position.
2.8 Initial Operation
With engine started as instructed previously and at operating temperature, adjust speed to about
half throttle. Hold the handle firmly with one hand and move the safety stop switch to RUN
position to engage the trowel blades.
2.9 Finishing Operation
After floating, allow the concrete to set until it will support the weight of the trowel. Set the pitch to
approximately 1/4” to 3/8” on the blades. If the blades start to dig into the concrete, decrease the
amount of pitch.

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3 MAINTENANCE
3.1 Periodic Maintenance Schedule
The chart below lists basic trowel and engine maintenance. Refer to engine manufacturer’s
Operator's Manual for additional information on engine maintenance. A copy of the engine
Operator's Manual was supplied with the machine when it was shipped. To service the engine,
tilt the seat forward.
Daily
Every
20
hours
Every
50
hours
Every
100
hours
Every
200
hours
Every
300
hours
Check fuel level.

Check engine oil level.

Inspect air filter. Replace as needed.

Check external hardware.

Clean trowel after each use to remove
concrete splatter.

Replace the engine oil

Grease blade arms

Clean air filter

Thrust collar and clutch. Replace blade
if necessary

Check drive belt for wear.

Change engine oil.

Check fuel filter.

Clean and check spark plug.

Replace oil filter.

Replace spark plug.

Replace fuel filter.

Adjust blade speed

Replace oil in gearboxes.


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3.2 Lubrication
The long life and successful operation of any parts of machinery is dependent on frequent and
thorough lubrication. Before using the machine, always check the oil and use proper oil with the
correct type and grade as recommended.
NOTICE: DO NOT mix types of oil in gearbox and DO NOT overfill the oil. Damage to the
machine may occur if oils are mixed or overfilled. See Technical Data for oil quantity and type.
3.3 Transporting Trowels
1. Before lifting the machine, ALWAYS turn off the engine and pull out the key from the machine.
2. Make sure lifting device has enough capacity to hold machine (see identification plate on
machine for weight).
3. DO NOT lift the machine overhead with a float pan attached.
4. NEVER lift the machine only by the handle.
5. Use lifting point (see safety label stick in the machine) when lifting the machine.

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3.4 Trouble Shooting
SYMPTOM
POSSIBLE CAUSES
SOLUTION
Engine running rough
or not at all.
Safety switch malfunction?
Make sure that the safety switch
is ON or replace switch if
necessary.
Fuel?
Look at the fuel system. Make
sure there is fuel being supplied
to the engine. Check to ensure
that the fuel filter is not clogged.
Ignition?
Check to ensure that the ignition
switch has power and is
functioning correctly.
Safety switch not
functioning.
Bad contacts?
Replace switch.
Loose wire connections?
Check wiring. Replace as
necessary.
Other problems?
Consult engine manufacturer's
manual.
If trowel "bounces,
rolls concrete, or
makes uneven swirls
in concrete".
Blades?
Spider?
Make certain blades are in good
condition, not excessively worn.
Finish blades should measure
no less than 2" (50mm) from the
blade bar to the trailing edge,
combination blades should
measure no less that 3.5"
(89mm).
Bent trowel arms?
Check that all blades are set at
the same pitch angle as
measured at the spider.
Trowel arm bushings?
Check the spider assembly for
bent trowel arms. If one of the
arms is even slightly bent,
replace it immediately.
Thrust collar?
Check the trowel arm bushings
for tightness. This can be done
by moving the trowel arms up
and down. If there is more than
1/8" (3.2mm) of travel at the tip
of the arm, the bushings should
be replaced. All bushings should
be replaced at the same time.

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Thrust collar bushing?
Check the thrust collar by
rocking it on the spider. If it can
tilt more than 3/32" (2.4mm) [as
measured at the thrust collar
O.D.], replace the bushing in the
thrust collar.
Thrust bearing worn?
Check the thrust bearing to see
that it is spinning free. Note:
Thrust cap, replace if necessary.
Machine has a
perceptible rolling
motion while running.
Main shaft?
The main output shaft of the
gearbox assembly should be
checked for straightness. The
main shaft must run straight and
cannot be more than 0.003"
(0.08mm) out of round at the
spider attachment point.
Yoke?
Check to make sure that both
fingers of the yoke press evenly
on the wear cap. Replace yoke
as necessary.
Blade Pitch?
Check to ensure that each blade
is adjusted to have the same
pitch as all other blades. Adjust
per maintenance section in
manual.
Clutch slipping or
sluggish response to
engine speed
change.
Worn V-belts?
Replace V-belt.
Dirty centrifugal clutch?
Disassemble and clean clutch.
Defective or worn out
centrifugal clutch?
Replace entire clutch.
Worn bearings in gearbox?
Rotate input shaft by hand. If
shaft rotates with difficulty, check
the input and output shaft
bearings. Replace as necessary.
Verify that the gearbox shaft
rotates when the input shaft is
rotated.
Worn or broken gears in
gearbox?
Replace both the worm and
worm gear as a set.

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4. TECHNICAL DATA
Model
CT424-2
CT424-3
CT424-4
Engine type
Chinese Petrol Engine
Robin EX13
Honda GX160
Power
kw(hp)
4.0(5.5)
3.2(4.2)
4.0(5.5)
Operating weight
kg(lb)
60(131)
59(130)
59(130)
Blade speed
rpm
70-150
Rotor Dia.
cm(in)
60(24)
Combination Blade
in
4.75 x 9
Float Pan
in
25
Gearbox Lubrication
type/ml
Model
CT430-2
CT430-3
CT430-4
Engine type
Chinese Petrol Engine
Robin EX17
Honda GX160
Power
kw(hp)
4.8(6.5)
4.2(5.7)
4.0(5.5)
Operating weight
kg(lb)
76(167)
75(165)
75(165)
Blade speed
rpm
70-150
Rotor Dia.
cm(in)
79(30)
Combination Blade
in
6 x 10.5
Float Pan
in
31
Gearbox Lubrication
type/ml
Working Size (L x W x H):
Model
L (mm)
W(mm)
H(mm)
CT424 Series
1560
610
950
CT430 Series
1560
770
980
Engine type may vary, please see listing

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4.3 Sound Specification
The required sound specification:
CT424 Series
CT430 Series
The sound pressure level at operator’s location (LpA)
87dB(A)
90dB(A)
The guaranteed sound power level (LWA)
102dB(A)
115dB(A)
These sound values were determined according to ISO 3744 for the sound power level (LWA) and
ISO 11204 for the sound pressure level (LpA) at the operator’s location.
4.4 Vibration Specification
The weighted effective acceleration value, determined according to ISO 2361-1 and ISO 5349, is:
for hand arm:
CT424 Series: 1.1 m/s2
CT430 Series: 1.3 m/s2
The sound and vibration specifications were obtained with the unit operating on fully cured, water
wetted concrete at nominal engine.

Unit 2 Low Farm Low Road, Morley St Botolph, Wymondham, United Kingdom, NR18 9BU
[email protected]
01953 711952
www.nuequipment.co.uk
Version: 201312-02