Power NRB-25 User manual

ELECTRIC REBAR BENDER
HANDLING INSTRUCTIONS
NRB-25
NRB-32

READ THESE INSTRUCTIONS CAREFULLY BEFORE
ATTEMPTING TO USE.Ignorance of proper operating
procedures can lead to accidents. If in doubt about any
procedure, contact your nearest authorized distributor.
CONTENTS
General Safety Precautions
Parts and specifications
Operating Instructions
Pre-use checks
Warm-up
Stopper adjustment
Points of attention
Maintenance
Cleaning
Oil-level check
Oil change
Bolt tightness
Carbon brushes

GENERAL SAFETY PRECAUTIONS
USAGE
Use NRB-25 NRB-32 rebar bender on concrete re-inforcing bars
only.
RESRICT USE TO DESIGNATED MATERIALS
Don’t use the machine to bend very hard rebar.The hard rebar may
break and will also damage the tool. Do not attempt to bend rebars.
Harder,thicker or thinner than those specified (see page 5).
USE EYE PROTECTION
Wear safety goggles,safety glasses with side shields or a face shield
while using bender.
PROVIDE SAFETY BARRIERS
Erect safety screens to protect co-workers from possible flying
ends.Place safety screen under the rebar when working in high places.
GUARD AGAINST ELECTRIC SHOCK
To avoid possible electric shock,do not handle bender with wet hands
or use bender in the rain or damp places.Be aware of all power
lines,electric circuits and other hazards that may be
contacted,especially those that are below the surface or otherwise

hidden from view.
UNPLUG TOOL
Disconnect bender from outlet while not in use and before
cleaning,adjusting or servicing.Do not disconnect plug from outlet by
pulling the cord.Always check that the switch lock is OFF before
plugging in.
BEWARE OF ENVIRONMENT
Do not use bender in the presence of flammable materials(e.g.
paint,thinner, petroleum products ,adhesives).
Do not use bender in a possibly lighted and clear of
obstructions.Operator should at all times have an unobstructed view
of the cutter,rebar and surrounding area.
WEAR PROPER APPAREL
Do not wear loose clothes,dangling objects or jewellery.Restrain
long hair.
The use of a safety-helmet and rubber soled boots is recommended.If
safety gloves are worn,be especially careful that gloves does not get
caught in moving parts
KEEP VISITORS AWAY
Keep all visitors at a safe distance from the work area for their own

protection
And to prevent distraction of the operator.
MAINTAIN BENDER WITH CARE
Inspect bender before each application.Keep handle dry,clean and free
from oil and/or grease.Keep housing and piston free of dirt and iron
filings.Check that no screws or bolts are loose or missing.Following
instructions for maintenance.Inspect switch,cord,Plug and any
extension cable at regular intervals.
STORE CAREFULLY
When not in use,store bender and accessories in a dry place where
they can’t be accessed by unauthorized persons.
PARTS AND SPECIFICATIONS
1. Handle
2. Switch
3. Mode control lever
4. Oil plug
5. Front handle
6. Hook
7. Roller
8. Housing
9. Motor

Main Parameters
OPERATING INSTRUCTIONS
! CAUTION: Indicates hazard that could result in minor personal
injury and/or product damage.
CARE: Indicates hazard that will result in product damage.
PRE-USE CHECKS
1. Check oil level.
Model
NRB-32
NRB-25
Voltage + 5%
□100/115V □220-240V AC only
Wattage
1350 W
1500W
Dimensions
560*260*200 mm
560*170*220mm
Weight
24 Kg
16 Kg
Max.rebar diameter
32 mm
25mm
Min.rebar diameter
4mm
4mm
Max.rebar hardness
Tensile strength 650N/mm2
Bending speed
5.0 -8.0 sec.
5.0s

2. Check condition of bender blocks and tightness of bender block
bolts.
3. Check that the power source is appropriate to the bender
CARE: if voltage is too high,the motor will burn out.If the voltage
is too Low,insufficient power will be generated.Never use DC
power.
4. Check that power supply is properly earthed.
! CAUTION:Failure to earth power supply may result in electric
shock to operator.
5. Check that cord is undamaged and that plug is not loose.
If an extension cable is to be used,make sure that it is undamaged and
that it is the proper thickness for the length.See table below.
110/115V 230V
Cable length
Cable size (AWG) Nominal diameter
Up to 10m (33 ft ) 16 1.0mm²
Up to 15m (50 ft ) 14 1.25mm²
Up to 30m (100 ft ) 10 1.5mm²
6. Before plugging in,make sure that the switch lock is OFF.
WARM-UP
In cold weather,warm up unit for 30~60 seconds so that the
hydraulic oil reaches the proper viscosity.Pull trigger-switch to

extend piston and release when it has reached its full stroke.Repeat
15~20 times.
POINTS OF ATTENTION
1. Do not cover air vents.
CARE: If events are covered,motor will overheat and may
burn out.
2. If hydraulic oil exceeds 70.( (158.F) in temperature, power
will drop. Allow unit to cool before resuming operation.(Be
particularly careful in summer, when the aluminum pump case
heats up quicker.)
3. If a drop in power is observed and motor is unusually hot,
check carbon-Brushes.
OPERATION
The NRB-32 is primarily intended to straighten deformed rebar. It
can or course , also be used to bend straight rebar.
To enable the unit to be used in confined spaces, there are two
operating modes: PUSH & PULL. The mode is selected by
moving the mode control lever to the appropriate position.

“A” for push (piston advances) and “B” for pull (piston retracts) in
either mode, simply press the switch to move the piston.
NB: The movement of the piston is limited by a safety valve. To
prevent overheating , release the trigger switch when the piston has
reached its travel limit.
TO PUSH
Advance or retract the piston so that the hook is in a suitable starting
position . Set the mode control lever to “A” and fit the rebar as shown
at the left. Pull the trigger switch until the rebar is at the desired
angle.

TO PULL
Set the hook in the correct starting position, make sure that the mode
control lever is in the “B” position and fit the rebar as illustrated . Pull
the trigger switch until the desired angle is attained.
NB: It is important that the rebar be properly fitted in the hook and
against the rollers.
INTERIOR ANGLE
Since the piston stroke is limited , interior straightening/bending
angle will vary according to rebar diameter and operating mode.
Refer to the table below.

MAINTENANCE
CLEARING
Cleaning bender every day,preferably immediately after use.
!CAUTION: Wear gloves to protect hands from metal splinters.Do
not use an air-gun:blasting with air can cause metal filings and/or
dust to get into eyes and respiratory system.
1. Disconnect unit.
2. Wipe or brush away all dirt and metal filings.Pay particular
attention to the lower half of the piston, where dirt is more easily
accumulated.
OIL-LEVEL CHECK
As the bender is hydraulically operated,the oil-level must be
checked at frequent intervals,preferably every day.Failure to
maintain the oil at the proper level results in a drop in pressure
and loss of bending power
!CAUTION: Hydraulic oil is highly flammable.Keep away from
sparks and naked flame.Do not smoke.
!CAUTION:Hydraulic oil may cause inflammation of the eyes and
skin.If ingested,it will cause diarrhoea and vomiting. In case of
eye contact, rinse in clean water for at least 15 minutes And consult
a physician.

In case of skin contact, wash thoroughly with soap and water.
In case of ingestion, consult a physician immediately. Do not
Deliberately induce vomiting.
1. Oil should be warm but not hot. Warm up unit if cold.
2. Adust stopper and make three or four cuts, noting exactly at what
point the Rebar is actually breaking.
3. Pinch a short piece of rebar,stopping just before it breaks off.
Unplug unit From power source.
4. with partially severed rebar in place, turn unit over so that oil-plug
is uppermost. ( If unit is hot,allow to cool down.)
5. Remove oil-plug and seal-washer (packing).
!CAUTION: Never remove oil-plug when unit is hot or oil will
spurt out.
6. Check that oil is level with bottom of plug hole(i.e. that pump case
is full to The brim). If oil level is too low,top up with 20-weight
hydraulic oil with Anti-foam and anti-abrasion properties (ISO
viscosity grade VG46, e.g. Shell Oil Tellus 46, Mobil oil DTE-25
or Esso Uni power SQ46 ).
7. After topping up, extract air from system.Gently tilt cutter
lengthwise and Return it to a level position.Top up again and tilt in
the opposite direction. Repeat this process until all air has been
extracted.CARE: Bender cannot function properly if oil contains
air bubbles.

8. Replace seal washer (packing) and plug. Connect cutter to power
source and completely sever rebar.
OIL-CHANGE
The hydraulic oil should be changed at least once a year,sooner if it
appears dirty.
1. Unplug unit from power source. Remove oil-plug and
packing.Turn bender Over and drain oil into a suitable
receptacle.When oil ceases to drain out, tilt unit to rear so that oil
trapped in the piston housing can run out. When housing is
empty,tilt unit in the opposite direction to empty the residue in the
pump case.
2. With drain-hole uppermost, slowly fill the unit with fresh oil.
Replace plug And lightly tighten. Connect unit to power source and
advance piston two or three times.Unplug unit and remove
oil-plug.Top up oil-level and replace plug.
3. Finally,follow procedure for oil-level check.( Steps 2~8.)
Note: Dispose of hydraulic oil in accordance with local regulations.
Do not Pour into the sea, a river, a lake or drains.
BOLT TIGHTNESS
Once a week, or after every 500 bends, check the tightness of all
bolts, especially those securing the housing to the cylinder. Loose
bolts will result in a loss of power.

CARBON BRUSHES
Inspect the two carbon brushes at least once every two
months,(Nominal brush life is 200 hours).
CARE: worn brushes will result in power loss, cause the motor to
run hot And irreparably damage the armature’s commutator.
1. Disconnect unit.
2. Unscrew both brush caps and pull out carbon brushes.
3. Replace brushes if less than 6 cm in length.