KEEL CUTTER
N450

Op era ti on Manual
NAKANO CUTTER LIMITEDThank you for choosing our Keel Cutter. This operation manual
offers procedures and precautions for safety use. Please read andunderstand this manual before use.
(Incorrect use may cause injury.)
Please carry the manual with you or store it carefully
so it is available when needed.

※ Descriptions in this manual may be changed without prior notice.

Table of contents

1

Prohibitions and precautions …………………………………………………… 1

2

Keel Cutter N450

3

3
Necessary parts and…………………………………………………………………
accessories

4

Procedures for cutting pipe ……………………………………………………… 4

5

6
Hydraulic typespeciﬁcations……………………………………………………………………………

1………………………………………………………………… 3

Speciﬁcations …………………………………………………………………… 62

Supplied accessories ………………………………………………………… 6

3

Optional accessories…………………………………………………………… 7

4

Optional accessories (blades) ……………………………………………… 7

5

Name of main components ………………………………………………… 8

6

Guide ring ……………………………………………………………………… 9

7

Guide ring components ……………………………………………………… 98

Attaching guide ring …………………………………………………………… 10

9

Attaching rotary plates ……………………………………………………… 11

10

Attaching spray unit …………………………………………………………… 12

11

Checking V-belts and chains ………………………………………………… 13

12

Blades …………………………………………………………………………… 14

13

Checking before attaching machine on the pipe ………………………… 15

14

Attaching machine on pipe…………………………………………………… 16

15

Attaching guiding unit ………………………………………………………… 17

16

Attaching driven shaft assy and hook shaft assy ………………………… 18

17

Setting hydraulic motor ……………………………………………………… 18

18

Connecting hydraulic hose and motor

19

Checking before starting hydraulic unit …………………………………… 20

20

Starting hydraulic unit ………………………………………………………… 22

21

Spraying water ………………………………………………………………… 23

22

Starting machine………………………………………………………………… 24

23

Removing machine……………………………………………………………… 26…………………………………… 19

6

Maintenance of cutter machine

7

Pipe stands

8

Water tanks ………………………………………………………………………… 30

9Genuine blades

10

Maintenance ………………………………………………………………………… 33

11

Blades and applicable pipes …………………………………………………… 34

12

Extension chains …………………………………………………………………… 35

13

Minimum working clearance for Keel Cutters ……………………………… 35……………………………………………… 27………………………………………………………………………… 28…………………………………………………………………… 32

1Prohibitions and precautions◆ Prohibitions ◆・Do not let personnel operate the cutter if they don't understand the
instructions in this operation manual.
・Do not touch the blade when it's rotating.

・Sparks may come out from the blade when it's cutting. Do not use thecutter in places with danger of explosion (where flammable gas may
be generated or exist).
◆ Precautions ◆・Wear safety goggles during operation to protect eyes from cut off dust.
・During operation and immediately after shutdown, the machine andthe blade are hot and may cause burns.
・Inspect the machine before use. Clean and grease the machine afteruse.
・Do not wear loose clothing like ties which may get caught in themachine.

1

KEEL CUTTER N450

・Please use genuine Keel Cutters parts. Non-genuine parts may cause
failures or early wear in the product. Damages or failures caused by
non-genuine parts may not be covered by warranty.

・Safety instructions given in this operation manual do not represent
all circumstances which may occur. Great caution must be taken
and sufficient safety instructions must be given to operators andmaintenance workers.

・Store the original package box of the machine, blade etc. for use whensending them back for repair or sharpening.

Warning symbols used in this manual:《DANGER》

Indicates a high level risk to the operator andbystanders, if the instruction is not followed.

《WARNING》

Indicates a hazard which, if not avoided, may result ininjury to the operator and bystanders.

《CAUTION》

Indicates a precaution which may affect durability of the
product and work efficiency.

《Caution Hot》

※ Gives additional technical information.

KEEL CUTTER N4502

２

Keel Cutter N450
N450 was developed to cut ductile iron pipes automatically with high accuracy.

Hydraulic driving type
Having hydraulic unit 04E as power source, the product includes a blade
lowering unit for accurate cutting and a guiding unit for securing guidering.
By adding one extention chain, the cutter can cut pipes up to φ733mm.
Stable operation is provided with cutting speed 100mm/min.

３

Necessary parts and accessories
The following parts and accessories are necessary for cutting pipes (not for
construction work).

Keel Cutter N450 machine main body
Hydraulic unit 04E
Blade, cutter holder and cutter holding plate
Optional parts and accessories (see the list below)

Main optional parts(1) Guide Rings *necessary
A guide ring is attached to the pipe to keep the cutter on track. Select the rightguide ring according to the nominal pipe diameter.
(2) Pipe Stands (H or L) *to be used if necessary

Pipe stands are used for holding the pipe when it is cut on the ground.
(3) Water tank, 7 or 12 liters *necessary

Used for spraying water to the blade and cooling it during cutting.
(4) Wedges *to be used if necessary
For preventing the cutting blade from getting caught in the pipe

3

KEEL CUTTER N450

４Procedures for cutting pipe
STEP 1

Checking necessary parts
・See the previous section (P3)

STEP 2

Attaching blade
・ Attach a blade to the machine (P14)STEP 3

Attaching guide ring(1) Select a guide ring of the same diameter as the pipe.
(2) Check where to attach the guide ring (P9)(3) Attach the guide ring (P10)

Setting up machine (P15)・Adjust guiding unit (P17)STEP 4

STEP 5Connecting cutter and hydraulic unit
・Check the hydraulic unit before starting (P18)

KEEL CUTTER N450

4

STEP 6

Starting hydraulic unit (P20)
・Read operation manual of the hydraulic unit beforehand.

STEP 7Lowering blade and running machine (P24)

STEP 8Removing machine from pipe (P26)5KEEL CUTTER N450

5Hydraulic type specifications

1 Specifications■Cutter machine
Applicable pipe type

Ductile iron, cast iron, steel, Hume concrete pipe

Cut depth

19.9mm(when diamond blade 125x3 Ｓ is used)
32.4mm(when diamond blade 150x3 Ｓ is used)

Cut speed

100㎜ /min

Dimensions(H)220mm x (W)517mm x (L)330mm(when guiding unit and blade lowering unit are attached)

WeightApprox. 16kg

Oil to be used

Idemitsu PromenteSJ/CF-4 10W-30 or equivalent■Hydraulic drive unit
Speed

620rpm (Hydraulic motor M26)

Max. pressure

10Mpa

Discharge rate

16ℓ /minDimensions(H)655mm x 388mm x 540mm

WeightApprox. 90kg

Hydraulic oil to be used 25ℓ (Super Hydro 32A (Idemitsu) or equivalent)

2 Supplied accessories■ Cutter machine① Keel cutter N450 hydraulic drive type main body …………………………………………× 1(including guiding unit and screw type blade lowering unit)② Extention chains ……………………………………………………………………………………× 1③ Driven shaft assy (with single pulley) …………………………………………………………× 1④ Hook shaft assy ……………………………………………………………………………………× 1⑤ V-belt SB-25(A100) …………………………………………………………………………………× 2⑥ Cutter holder for cutting (A27) …………………………………………………………………× 1⑦ Cutter holding (A28) ………………………………………………………………………………× 1⑧ Ratchet handle (A104) ……………………………………………………………………………× 1⑨ Crank handle (K159) ………………………………………………………………………………× 1⑩ Safety goggles (A111) ……………………………………………………………………………× 1⑪ Single head spanner 24mm (A101) ……………………………………………………………× 1⑫ Hex key #5 (A102) …………………………………………………………………………………× 1⑬ Hex key #6 long (A103)……………………………………………………………………………× 1⑭ Straw broom (A112) ………………………………………………………………………………× 1⑮ Single head spanner 13mm (A721) ……………………………………………………………× 1⑯ Operation manual …………………………………………………………………………………× 1
KEEL CUTTER N450

6

■ Hydraulic unit
① Hydraulic unit 04E …………………………………………………………………………………× 1(including hydraulic motor M26, hydraulic hose 10m with coupler x 2)
② Tool (plug wrench) …………………………………………………………………………………× 1

3 Optional accessories■Guide Rings
φ 93 ～φ 733mm

According to pipe outer diameter■Water Tanks
Water Tank 7ℓfor pipe φ 528mm (OD)

Water Tank 12ℓ

for pipe φ 528mm or above (OD)

■Pipe Stands (3 or 4 pcs to be used)(L) with aluminum wheel for pipe φ 118-1554mm (OD)
(H) with aluminum wheel for pipe φ 93-733mm (OD)
(H) with rubber wheel

for pipe φ 93-733mm (OD)

■Extension chains
Extension chains■Wedges (2 pcs)
WedgesFor preventing diamond blade from gettingcaught in the pipe

4 Optional accessories (blades)■Diamond Blades
125 × 3S

Cut depth: approx. 19.9mm (new blade)

150 × 3S

Cut depth: approx. 32.4mm (new blade)■HS Tipped Saw Blade
125 × 4.2

For steel pipe

7

KEEL CUTTER N450

5 Name of main components
Cutter machine

Guiding unit
Guide ring

Hook roller (A45)
Drive shaft assy
Fook shaft assy

Chain roller (A43)

Roller bumper (A25)
Hole for cock lever
Blade cover

V-belt SB-25 (A100)
Clutchblade lowering unit (screw type)
Arm (A10)

Driven pulley (A32)

Hydraulic unit

Switch lever (A410)

Pressure gauge (A454)
Switching valve assy
Hydraulic pump 04A (A453)
Hydraulic hose 10m

Hydraulic motor(with ﬂat coupler)

KEEL CUTTER N450

8

Oil-level stick6 Guide ring
■Check the cutting position and guide ring position

cutting position

guide ring
380mm

7 Guide ring components
Tightening screw

Nut M12 (K267)
Plain washer M12 (D022)

Caulking pin (K266)

Roll pin
φ8×24（K269）
Hex socket head bolt
M8×35（K264）

9Supporting part
（K270）KEEL CUTTER N450

8 Attaching guide ring
１
▪Open the guide ring and attach it
around the pipe

•Be
f
ore a
t
t
ach
i
ngthe guidering,move upthe hex bolts M8x35sot
hey don't touch
t
he p
i
pe.

２

▪Fit the tightening screw in the slot
and fasten the nut
Slot３▪Temporarily fasten the M8x35 bolts
evenly•Attachthe gu
i
der
i
ng a
tar
i
ghtang
l
e
tot
he p
i
pe

４

▪Check the position
•I
ft
he gu
i
der
i
ngi
sd
i
sp
l
aced,adj
us
ti
tby h
i
t
t
i
ng wi
th
p
l
as
t
i
c hammer(do notuse ani
ron hammer).

５▪Fasten the bolts evenly on thecircumference• Ensure the guide ring doesn't get
displaced while fastening the bolts.

KEEL CUTTER N450

10

9 Attaching rotary plates
If the diamond blade on the cutter touches the pipe, adjustment withrotaty plates is necessary so the blade doesn't touch the pipe.

▪When using the blade 125×3S:▪When using the blade 150×3S:

Pipe OD φ93-117mm: [A]Pipe OD φ118-168mm: [X]Pipe OD φ169-219mm: [X]Pipe OD φ220-270mm: [B]Pipe OD φ169-219mm: [B]１▪Remove the hex bolts• Remove the hex bolts from the arm.

Hex socket head bolt M8x25 (A085)

２▪Markings and female thread• There are two rotary plates inside the arm.
• There are markings [A] [B] [X] on the rotary
plates and female thread (M8) by each marking.

B
X
A※ Check if the rotary plates are warped or
distorted. If they are, the blade may touch
the pipe.

３▪Fasten the hex bolts• Align the hole in the arm and the female

thread (with the right diameter), and insert
the bolt (M8 x 25) from the arm side tofasten (to be fastened by two bolts).

11

KEEL CUTTER N450

⓾ Attaching spray unit
※ It is necessary to spray water on diamond blades.

１

２▪Spray unit (a set of 7 components)from the water tank (optional) is
necessary.

▪Attach the spray unit
• Attach the unit to the hole in the blade cover as shown below.
• Adjust the assembly so that the spray port faces the diamondblade.

Flat washer
Spring washer
Wing bolt M10

Nut M10

Male coupler

Cock lever

KEEL CUTTER N450

Blade cover12⓫ Checking V-belts and chains■Check the V-belts

・Check that 2 x V-belt SB-25 are fitted in the cutter machine.
If they are not, fit the V-belts as shown below.

１▪Remove the blade cover• Remove the two hex bolts (M6x10) fixing
the blade cover using hex wrench (5mm).

２▪Fit the V-belts• Fit the V-belts SB-25 on the drive
pulleys.

３▪Attach the blade cover• Attach the blade cover with two hex bolts(M6x10).

■Check the chains

・Select the right chains according to the pipe diameter.

Pipe diameter

Chains to be used

φ93～φ220mm

Chain (machine side)φ221～φ476mm

Chain (machine side) + extension chain

φ477～φ733mm

Chain (machine side) + extension chain x 2

13

KEEL CUTTER N450

⓬ Blades■Selecting a blade

Select either from diamond blade 125 x 3S or 150 x 3S.

■Blade and related components necessary for cutting
Part No.

①

A27

②

Description

Q'ty

Cutter holder

1

Diamond blade 125×3S or 150×3S

1

③

A28

Cutter holding plate

1

④

A93

Hex nut M16

1

A93 Hex nut M16

Cutter shaft

Key × ×Roller bumper

④ ③

②

①

■Attaching the blade

・Check the rotational direction and order of fitting the relatedparts, then attach the blade securely with supplied ratchet handle
and single head spanner 24mm.

KEEL CUTTER N450

14

《Caution》
Direction of blade rotation
・Cutting blade (diamond blade) has a specified rotational direction.
The direction is marked on the blade as shown below.
※It rotates counterclockwise.

・If the blade is attached for the wrong direction, not only the blade
doesn't cut, but it will be destroyed and cause troubles.
Ensure the nut is securely fastened to fix the blade. It is very
dangerous if it gets loose during rotation,⓭ Checking before attaching machine on the pipe
■Ensure the following two points before attaching the machineon the pipe.
•Checktha
tthe b
l
adel
ower
i
ng un
i
t(sc
rew t
ype)i
se
l
eva
ted.
※ T h e p a r t s h o wi n g " U P " a n d"Down"(arrows) should stay at the
top of the screw.

※If it's lowered, the blade may touch the pipe.

15

KEEL CUTTER N450

・Slightly loosen the nut on the outer roller shaft of the guiding unit
with wrench (24mm).

※If the nut is tightened, the guiding unit may not fit on the guide ring.

⓮ Attaching machine on pipe・Clean the pipe you are going to cut. If it is oily, the cutter may beslipped.
・Hold the guide ring between rollers of the guiding unit.

・Check that the V-belt fit in the groove of the drive pulley (on bothsides).
・Check that the blade doesn't touch the pipe. If it does, move up theblade before starting the machine.
Arm
Blade coverClutchPipe
Driven pulley
KEEL CUTTER N450

16⓯ Attaching guiding unit
１

▪Push the inner side guide rollers(on the machine side) against theguide ring.

２▪Tighten the adjusting bolt (M8)with spanner (13mm) until theouter guide roller contacts theguide ring.

３▪Fix the nut of the outer roller
shaft, then fix the M8 adjusting
bolt with nut.

４

▪Loosen the wing bolt and lower
the bracing attachment until its

two rollers touch the pipe, thentighten the wing bolt securely.

17

KEEL CUTTER N450

⓰ Attaching driven shaft assy and hook shaft assy
１

▪Set the driven shaft assy and hookassy.

•Adjust the long screw with a sufficienttightening margin.

2▪Connect the chains•Connect the chains on the hook of thedriven shaft assy.

３▪Tighten the belts•Fit the ratchet handle to the end of
the long screw and slightly tighten thebelts with the wrench.

⓱ Setting hydraulic motor
１▪Hydraulic motor (M-26)•Use the hydraulic motor included in thehydraulic unit 04E.

KEEL CUTTER N45018

2▪Attach the motor•Check that a key is fitted on the motor
shaft.
•Align the key to the keyway to attach
the motor.
A82 Key 5x5x19

３▪Tighten the bolt
•Fix the motor securely by tightening
the bolt (hex socket head, M8x25)
using hex wrench #6.

⓲ Connecting hydraulic hose snd motor
１▪Connect the hydraulic hose andthe hydraulic motor•Clean the coupling part before
connecting the hose and motor.

2▪Connect couplers•After connecting the couplers,slide the outer part of thefemale coupler to preventthe couplers from being

Male coupler

Female coupler

disconnected.

19

KEEL CUTTER N450

３

▪Move the clutch to "Stop"Run

position.

•Be sure the clutch is at thestop position when starting
the engine.

Stop⓳ Checking before starting hydraulic unit
1

▪Check the hydraulic oil•Check the oil level with theoil level stick.
•The oil level should be above
the line in the middle of theoil-level stick.

Line

2

▪Add hydraulic oil•If necessary, remove the cap from thetank and add hydraulic oil.
•"Idemitsu Super Hydro 32A" orequivalent oil should be used.

Oil inlet
Ensure no contaminants get in when adding hydraulic oil.
A black rubber packing is fitted inside the oil cap to prevent oilleakage during transportation. Make sure to remove the packing
before using the machine.

Flower shape cap(with the packing)Rubber packing
KEEL CUTTER N45020

The hydraulic unit must be placed in the flattest place possible.
(maximum inclination angle: 10 degrees)３▪Check the fuel tank
•Add gasoline if necessary.。

4▪Check if the air cleaner is clean•Clean it if necessary.

MaintenanceEvery 50
hours

Engine oil change○※

Air cleaner cleaning○

Every 200
hours

Fuel strainer cleaning
Spark plug cleaning

Every 300
hours

○
○

Hydraulic oil change○

Hydraulic oil tank cleaning○

For the first time, change at 25 hours.
※Add engine oil if necessary. Idemitsu's "Pro-mente
SJ/CF-4 10W-30" or equivalent oil should be used.

Drain the gasoline completely if theengine is not used for a long time.
Thoroughly read Engine Operation
Manual before using the engine.

Engine oil inlet

21

KEEL CUTTER N450

⓴ Starting hydraulic unit
１

OFF
OFF

２

ON
ON

▪Move the switch lever to "OFF"position▪Move the clutch to "Stop" position

Run
Run

Stop
Stop

3

▪Turn on the engine switch of thehydraulic unit

４

▪Open the cock lever• Check the gasoline.
cock levercock levercock lever

Open
Open

Open

Close

Close
Close

【Close】

Close
Close

５

▪Start the engine【Open】

Open
Open• Confirm the safety before starting theengine６▪Warm-up operation• Keep the switch lever of the hydraulic unit to "OFF", then perform
warm-up operation for several minutes.
• Especially in winter, perform warm-up operation about 10
miniutes to improve the flow of hydraulic oil.

KEEL CUTTER N450

22

７
OFF

ON

▪Move the switch lever to "ON"The blade starts to rotate immediately after
you move the switch lever to "ON". Confirm

safety before moving the lever to "ON" and warn
operators and bystanders.
When you are going to switch on the lever,be sure the blade doesn't touch the pipe.
Run

８▪Break-in operation (be sure toStopperform this)

OFF

ON

Run

Stop

Close

㉑ Spraying water1• Move the clutch to "Run" position andrun the machine 200mm or more
without lowering the blade.
• By performing break-in operation, you
can prevent the cutter from being
driven off its track and suppress
overload during cutting.
• The V-belts are loosened after break-in
operation, so retighten them after the
break-in operation.
※ The clutch mechanism is for running orOpencock leverstopping
the machineon the pipe. It's
not for rotating the blade.
Close

Open

▪Open the cock lever and spraywater on the blade

cock lever

Open

Close
Close
23

Open

KEEL CUTTER N450

㉒ Starting machine
1▪Lower the blade• Attach the crank handle to the blade
lowering screw, then turn the handle

counterclockwise to lower the blade
and cut through the pipe wall.

2▪Check the depth• Check the depth with "Roller Bumper"
which is attached on the arm side of
the blade cover.
• You can rotate the roller bumperwith your hand until it comes to theproper depth position.
When the roller bumper is at the proper position, it touches
the pipe and cannot be rotated any more.
Tighten the wing bolt on the blade lowering unit.

Turn the roller bumper with bare hand.
Do not touch the blade.
Wear safety goggles during cutting to protect eyes from cut off
dust.
Do not lower the blade quickly, which will scatter fragments ofpipe and cause machine troubles.
Ensure the blade cover is closed when the blade is rotating.

KEEL CUTTER N450

24

３▪Move the clutch to "Run" positionRunand run the cutter around the pipe

Stop

In case of cutting buried pipe,
the diamond blade may getcaught in the cut pipe as the
cutting comes to the end,
causing damage to the blade.
To prevent this, drive in wedges
before and after the blade.

blade
wedge

4
▪Complete cockthe lever
cut

Open

Close
Close

Open

• After the cutting is done, move the clutch to "Stop" position

to stop the run, then lift up the blade by turning the crankhandle.

56OFF▪Move the switch lever to "OFF"ON▪SlowRundown and stop the engine
Stop

25

KEEL CUTTER N450

㉓ Removing machine
1▪Disconnect the couplers• Slide the outer part of the female
coupler to disconnect the couplers.

２▪Remove the driven shaft and hook
shaft assy
• Turn the long screw of the hook shaft
assy clockwise using crank handle, andremove the hook shaft assy from theV-belts (SB-25).

３▪Remove the guiding unit from theguide ring

• Loosen the bolts and nuts in reverse
order to remove the guiding unit.

4
5▪Remove the machine from the pipe▪Remove the guide ring

KEEL CUTTER N45026

6Maintenance of cutter machine１▪Lubricate the sliding parts:• Roller bumper (A25)• Hook roller (A45)• Chain roller (A43)• Chain shaft roller (A44)• Driven pulley (A32)

Hook roller
Chain roller

PulleyChain shaft roller

Roller bumper

Hook roller
V-belt(SB-25)

Bolt(M6x10)

２▪When the roller bumper is dirty and doesn't rotate.
• Remove the blade cover (see page 13), clean and lubricate theroller bumper, then attach them back on the machine.

If the rollers get stuck by rust or cut off dust, or the chain plate isdeformed, the cutter may slip or not run straight, or the cut line
may not meet the starting point.
It is recommended to overhaul the cutter machine and hydraulicunit about every 2 years.

27

KEEL CUTTER N450

7１

Pipe stands▪How to use pipe stands
•P
i
pe s
t
ands are used whenthe pipeis cutonthe ground.
●Usi
ng 3 pi
pe stands•Use one each stand at both ends ofthe pipe,and use
one st
and undert
he cu
t.Af
terthe pipei
s cut,two piecesof cutp
i
pe wi
l
ls
i
tont
he mi
dd
l
es
t
and.
cut

●Us
i
ng 4 pi
pe stands•Use one each stand at both ends of the pipe, and one each atboth sides of the cut (the stands should not get in the way of
attaching the machine and cutting the pipe).
Cut

Use the pipe stands at a flat place. Do not use them on a slope.

KEEL CUTTER N45028

２▪Types of stand and applicable diameter
•App
l
i
cab
l
ep
i
pe d
i
amet
er

Diameter
Pipe stand (H)φ93～φ733mm

Pipe stand (L)φ118～φ1554mm

•Pos
i
t
i
on o
f wheelsPipe stand(H)
Rubber wheel

φ322〜φ733mm
φ93〜φ321mm

Pipe stand main body※Eitherrubberoralumi
num wheels may be usedi
n(H)t
ype.
P
i
pe s
tand(L)

Aluminum wheel

φ528〜φ1554mm
φ374〜φ527mm
φ220〜φ373mm
φ118〜φ219mm《Important Caution》
Fit the wheels at the right place so that pipe is firmly supported.
Unstable pipe may cause accidents. Gently put the pipe on thepipe stands so the wheels won't come off.

29

KEEL CUTTER N450

8Water tanks
Applicable pipe diameter

1

Water tank 7ℓ～φ528mm

Water tank 12ℓ

φ528mm～▪Attach the spray unit (a set of 7 components) to theblade cover (see page 12)２▪Fill the tank
• Loosen the handle, remove the lid
and fill the tank with tap water.
• After filling the tank, firmly attach
the lid.

《Important Caution》
If the lid is loose, you cannot pressurize enough. Also it willcause danger if the lid comes off during pressurization.

3

KEEL CUTTER N450

▪Connect the coupler on
the hose to the water feed
assembly.

30

4▪Pressurization
Up & down
Handle

Lid
Close
Open

Safety valve• Pressurize the tank by moving thehandle up and down, and stop thepressurization when the safety valve isgreen.

• If pressurization exceeds 5kg/㎠ , thesafety valve turns red and depressurize
the tank.

※ If you push down the handle to the lowest position and turn itleft (counterclockwise), the handle remains at the down position.

5▪Spray water• Spray the diamond blade or tipped saw
blade.
Diamond blade

6▪Maintenance• The couplers may stick in cut off dust. Wash them and spray antirust agent after use.

31

KEEL CUTTER N450

9Genuine blades
1▪Diamond blades• Our diamond blades were specially developped for cutting castiron pipes.

• They are different from competitors in every aspect, such as
ingredients and hardness of the diamond.
• Cutting tests were repeatedly performed to design the blades,
and they are manufactured to deliver the best mechanicalperformance.

2▪Check the blade• Check if it has missing tips, it is worn out or its base is deformed.

If the pipe is hard, run the machine around the pipe twice. If that's
still not enough, run the machine three times.

Non-genuine blades
Blades made by competitors provide different cutting conditions.
Use of non-genuine blades with our machine may overload themachine and the hydraulic unit and cause machine trouble.
Please use genuine blades.
※Failures may not be covered by warranty if non-genuine blade
has been used.

KEEL CUTTER N450

32

10

Maintenance1▪V-belts

If cut off dust remains on the belt after use, its durability will be
deteriorated.

Replace the belt if:• It is torn or frayed.
• It goes below the edge of the pulley wheel when it is tightened.

(If the machine is run with the belt staying below the edge of thepulley wheel, the belt will touch the bottom of the pulley wheel
and the drive force will not be transmitted.)

Edge of pulley wheel

V-beltBottom2▪Blade lowering unit (screw type)• Lubricate the screw and the rotating part to make the unit moveup and down smoothly.
• Stiff movement may cause damage to the parts.

Screw
Rotating part

33

KEEL CUTTER N450

11

Blades and applicable pipes
Diamondblade

Tipped Saw
BladeSpray water

Ductile iron pipe○△

Necessary

Cast iron pipe○○

Necessary

Hume pipe○

×

Necessary

Electric pole○×

Necessary

Concrete pile○×

Necessary(needs extra)

Steel pipe

×○

Necessary

Polyvinyl chloride
pipe

×

○

Necessary※△If a tipped saw blade is used for cutting ductile iron pipe, it's notpossible to cut concrete part of the pipe.

Cutting steel pipes①Special size guide ring may be necessary depending on
the pipe diameter.
②The machine may not be able to cut some steel pipes(depending on the diameter and wall thickness of the pipe).

KEEL CUTTER N450

34

12

Extension chains（mm）
φ93〜φ220 φ221〜φ476 φ477〜φ733

Chain attached to the machine
Extension chain x 1
Extension chain x 2

Extension chain

13

Minimum working clearance for Keel Cutters
（mm）
Model

Ｌ１

Ｌ２

Ｌ３

250～300

610～760

80～230

Ｎ600ＬＲＣU

250

470

58

N450 with hydraulic unit

200

470

52

Ｎ2600

L3

L2

L1

35

KEEL CUTTER N450