KEEL CUTTER
N2600

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 and understand thismanual before use. (Incorrect use may cause injury.)※Descriptions in this manual may be changed without prior notice.

Prohibitions 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 begenerated or exist).
◆Precautions◆・Wear safety goggles during cutting to protect eyes from cut off dust.
・During operation or immediately after shutdown, the machine and theblade are hot and may cause burns.

◎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 and maintenanceworkers.

Table of contents

1

Keel Cutter N2600 ………………………………………………………………… 1

2

Necessary parts and accessories ……………………………………………… 1

3

Cutting procedures ………………………………………………………………… 3

4

Attaching accessories to machine

5

1

V-belts …………………………………………………………………………… 4

2

Extension chains ……………………………………………………………… 4

Guide Ring …………………………………………………………………………… 5

1

6…………………………………………… 4

Guide ring components ……………………………………………………… 5

2

Attaching position of guide ring……………………………………………… 6

3

Attaching guide ring …………………………………………………………… 7

Roller bumper ……………………………………………………………………… 8

7

Blade and related components necessary for cutting pipes …………… 98

Attaching blade

9

Checking before attaching machine on pipe

1011…………………………………………………………………… 10……………………………… 10

Attaching machine on pipe ……………………………………………………… 11

1

Set the machine on the pipe

2

Attaching guiding unit ………………………………………………………… 12……………………………………………… 11

3

Attaching driven shaft assy, hook shaft assy and chains ……………………… 13

4

Setting hydraulic motor ……………………………………………………… 14

5

Water tank and connection of couplers ………………………………… 15

Checking before starting hydraulic unit ……………………………………… 16

12Connecting couplers ……………………………………………………………… 17

13

Starting hydraulic unit

14

Spraying water ……………………………………………………………………… 19

15

Starting machine …………………………………………………………………… 20…………………………………………………………… 18

16

Removing machine from pipe …………………………………………………… 22

17

Pipe stands …………………………………………………………………………… 23

18

Maintenance ………………………………………………………………………… 24

1Keel Cutter N2600◆Features◆

Keel Cutter N2600 cuts pipes φ528 to φ2684mm (outer diameter).
It is powered by hydraulic unit 16E with hydraulic hose of 15 meters.

2

Necessary parts and accessories① Keel Cutter N2600 cutter machine
Speciﬁcations
Hook assy

Applicable pipe type

Ductile iron, iron, Hume concrete pipe

Pipe diameter

φ528～φ2684mm

Cut depth

MAX57mmCut speed

Approx. 50-70mm/min.

Dimensions

H310mm×W830mm×L700mm

WeightApprox. 58kg

Oil to be used

Idemitsu Super Gear 460 or equivalentFirst driven shaft
Driven pulley
Clutch(oﬀ)
V-beltGuide ring
blade lowering shaft

Cutter cover
Drive shaft pulley

Gear case

Cuttershaft

Hydraulic motor

Roller bumper

Wheel (large)
Chain adjusting shaft

Guide rollers
Guiding unit

Supplied accessories

Adjusting collar

Bracketﬁxing bar

Main components of the machine

Q'ty

Part No.

Description

Q'ty

Cutter main body (Keel Cutter N2600)

1

L79

Adjusting collar D L=42mm

2

First driven shaft assy (with double pulley)

1

L80

Adjusting collar E L=44mm

2

Second driven shaft assy (with double pulley)

1

L81

Washer F

1

Third driven shaft assy (with single pulley)

1

L173

Tool box

1

Hook assy (with long screw)

1

L174

Ratchet wrench #400

1

Extension chain 2m

3

L175

Adjustable wrench #300

1

Extension chain 1m

1

L176

Double head spanner 24x30

1

V-belt D-43

6

L177

Plastic hammer

1

L73

Cutter holder (for cutting)

1

L178

Measuring tape 2m

1

L74

Cutter holding plate

1

L179

Safety goggles

1

Grooved collar L=11mm

3

L180

L75

Hex key, long, 5mm

1

L181

Hex key, long, 6mm

1

L76

Adjusting collar A L=18mm

2

L182

Hex key, long, 10mm

1

L77

Adjusting collar B L=27mm

2

L183

Metal ruler

1

L78

Adjusting collar C L=32mm

2

Operation manual

1Part No.

Description

1

KEEL CUTTER N2600

②Hydraulic Unit 16E (with hydraulic hose of 15m and hydraulic motor)
Speciﬁcations■Hydraulic Unit 16E
Rated output of engine

5.5KW

Maximum output

7.3KW

Discharge

Max.32ℓ/min

Dimensions

H640mm×W700mm×L830min

WeightApprox. 190Kg

Hydraulic oil to be used

Idemitsu Super Hydro 32A③Diamond Blade 230 x 5D
■Diamond blade 230x5D can cut
pipesφ528～φ2684mm (outer diameter).

④Guide Ring
■Check the outer diameter ofthe pipe you are going to cut.

⑤Water Tank 12ℓ■Water tank is necessary to spray water todiamond blade. (See page 15 for details)⑥Pipe Stands (L) with aluminum wheels■The pipe stands can support pipes up to
φ1554mm (outer diameter).
■Normally 4 pipe stands are used.
Increase the pipe stands as necessary.
(See page 23 for details)

KEEL CUTTER N2600

2

3

Cutting procedures

Checking necessary parts (P 1-2)
Attaching guide ring(1) Select a guide ring of the right size according to the outer diameter of the pipe(2) Check where to attach the guide ring (P6)(3) Attach the guide ring (P7)

Fitting blade(1) Diamond blade 230 x 5D is necessary (P9)(2) Fit the blade on the machine (P10)

Setting up machine (P11)・Adjust the guiding unit (P12)

Connecting cutter and hydraulic unit (P17)

・Check the hydraulic unit before connecting them (P16-17)

Starting engine (P18)

・Read the hydraulic unit operation manual beforehand.

Lowering blade and running machine (P20-21)
Removing machine from pipe (P22)
Maintenance (P24)3

KEEL CUTTER N2600

4

Attaching accessories to machine
1

V-belts■They are necessary for cutting pipes. The following table shows pipe
outer diameter and number of V-belts necessary for each diameter.
(V-belt D-43 x 6 is included as standard accessory)of V-belts
Pipe outer diameter (mm) Number
necessary

Driven shaft

φ528～φ630

D－43×2

1

φ631～φ1554

D－43×４2

φ1555～φ2684

D－43×６3

1st driven shaft

V-belt D-43

2nd driven shaft

3rd driven shaft■Fit the V-belts■Fitting the V-belt D-43 on the drive
pulley (both sides)

2

Extension chains※Extension chains are needed when setting the machine on the pipe.
2m chain x 3 and 1m chain x 1 are included in the product. The following tableshows pipe diameter and number of extension chains necessary for each diameter.
Pipe outer diameter (mm)Extension chains

φ528

1m×1

φ529～φ1041

2m×1

φ1042～φ1246

1m×1
2m×1

φ1247～φ1701

2m×2φ1702～φ2280

2m×3

φ2281～φ2684

1m×1
2m×３

KEEL CUTTER N2600

4

529,100050250
Guide Ring

29,60005030036,20005040039,60005045041,800■Guide ring is used to keep the machine from being driven oﬀ its course.
Select the050350
right guide ring according to outer diameterof the pipe.
36,900

1

Guide ring components■Guide ringis produced according to outer diameter. There are three
05050045,900types of guide ring available as shown below, with diﬀerent components
05060047,300for each type.

【Guide ring components type A】

05070051,50005080060,00005090064,30005100068,60005110085,600051200100,700

051350115,500

051500130,500
K【Guide ring components type B】
K

K

5KEEL CUTTER N2600

2

Attaching position of guide ring

■Check the cutting position and attaching position of the guide ring.

cutting position

guide ring

520 - 691mm is possible

KEEL CUTTER N2600

6

3

1

Attaching guide ring
■Open the guide ring and attach it
around the pipe
・Before attaching the guide ring,
move up the hex bolts M8x35 sothey don't touch the pipe.

23■Fit the tightening screw in the slot
and fasten the nut
Slot■Temporarily fasten the M8x35 bolts evenly
・Attach the guide ring at a rightangle to the pipe.

cutting position

guide ring

Right angle !

4■Check the attaching position
・If the guide ring is displaced, adjust it by hitting with plastic
hammer (do not use an iron hammer).

5■Fasten the bolts evenly on thecircumference
・Ensure the guide ring is not displaced
while fastening the bolts.

7

KEEL CUTTER N2600

６

Roller bumper■Adjusting roller bumper
Fasten the bolt at "MAX" position.

M

MAX■Adjust the roller bumper to make its "MAX" position come to thefemale thread in the machine main body, then fasten the bolt intothe "MAX" and female thread.
Roller bumper Assy
L154 Hex socket head bolt M6x30

Female thread for adjusting roller bumper

Cutting machine main body

KEEL CUTTER N2600

87Blade and related components necessary for cutting pipes■Blade and other components

Attaching accessories to machine
Cutter shaft

７

６ ３

２

５４

１

Description

Part No.

①

Cutter holder (for cutting)

L73②

Collar with groove 11mm

L75③

Adjustment collars④

Diamond blade 230 x 5D⑤

Cutter holding plate

L74⑥

Washer F

L81⑦

Nut M20L136

9KEEL CUTTER N2600

8

Attaching blade■Diamond blade 230 x 5D is necessary.
■Check the attaching order of
blade and related parts, thenattach them.
Check the direction of blade
rotation before attaching them.

9

The cutter shaft rotates counterclockwise. Pay attention to
the rotation direction when
attaching the blade.

Checking before attaching machine on pipe
■Check the following two things before you attach the machine on the pipe.
・Make sure the body of the machine is lifted to the top position.
※If it's lowered, move it up to the top by using the ratchet wrench.
If it's lowered the blade may touch the pipe.

Up

Down

Ratchet wrench・Slightly loosen the outer roller of the guiding unit with wrench(24mm).
※If the nut is tightened, the guiding unit may not ﬁt on the guide
ring.

KEEL CUTTER N2600

10

10

Attaching machine on pipe
1

Set the machine on the pipe・Clean the pipe you are going to cut. If it is oily, the cutter may
be slipped.
・Hold the guide ring between four rollers of the guiding unit.

Wheels (L)V-belts

Guiding unit

・Check that the V-belt ﬁt in the groove of the drive pulley (on both sides).
・Check that the blade doesn't touch the pipe. If it does, move up theblade before starting the machine.
・Check that two drive pulleys (on the belt) and the two wheels (large)
contact the pipe.

《Important Caution》

Adjust the drive pulley, driven pulley, V-belt and extension
chains so that they become in parallel to the guide ring.
V-beltAdjustment long screw

Drive shaft pulley
Driven shaft pulley

（main
body）

Guide Ring

ローラーチェーン

The distance from the guide ring to the drive
shaft pulley should be the same as the
distance from the guide ring to the driven
shaft pulley.

11

KEEL CUTTER N2600

2

Attaching guiding unit

1
Roller shaft■Adjust the angle of the roller
shaftsBolts

・Loosen the two bolts. Whenthe roller shafts are aligned
to the pipe center, fasten thebolts tightly.

2■Adjust the inner guide roller

ガイドリングコロ

M16ナット・Push the two inner guide rollers(on the machine side) against
the guide ring.
Inner guide roller

ガイドローラー

3■Adjust the outer guide roller

駆動軸プーリー

M6調整
ボルト･ナット・Tighten the adjusting bolt until
the outer guide roller contacts
the guide ring.
Outer guide roller

4■Fix the M16 and M6 nuts
・Fix the M16 nut of the outerroller shaft, then ﬁx the M6
adjusting bolt with the nut.

※You don't need to do this adjustment every time, but make sure thefour guide rollers always contact the guide ring. Otherwise, the cut line
may not meet the starting point.
KEEL CUTTER N2600

12

3

Attaching driven shaft assy, hook shaft assy and chains

1■Driven shaft assy, hook shaft
assy and chains
・See page 4 to check the typeand number of driven shaft andhook assy to be used (according
to outer diameter of the pipe).

2■Set the driven shaft assy andhook assy on the V-belt on
both sides.
・Adjust the long screw with asuﬃcient tightening margin.

3■Connect the chains・Connect the hook of theextension chain to the chain
attached to the machine, andconnect the hook assy andthe extension chain.

4■Tighten the belts
・Fit the supplied ratchet wrench
to the end of the long screw
and slightly tighten the belts.

13

KEEL CUTTER N2600

4

Setting hydraulic motor

1■Hydraulic motor
・Use the hydraulic motor includedin the hydraulic unit 16E.

2
■Attach the motor
・Attach the hydraulic motor,aligning the groove on therotation shaft.

3■Tighten the bolt・Fix the hydraulic motor securely
by tightening the bolts (hex socket
head, M12x30) using hex wrench
10mm.

KEEL CUTTER N2600

145Water tank and connection of couplers

1■Water tank 12ℓ is necessary.

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.

3《Important Caution》
If the lid is loose, you cannot pressurize enough. Also it will cause
danger if the lid comes oﬀ during pressurization.
■Connect the coupler on the watertank hose to the coupler on themachine cover.

Pressurizing the water tank
Up & down
Handle

Lid
Close
Open

Safety valve

・Pressurize the tank by moving the handle up

and down, and stop the pressurization when
the safety valve is green.

・If pressurization exceeds 5kg/㎠, the safetyvalve turns red and depressurizes the tank.

※If you push down the handle to the lowest position and turn it left
(counterclockwise), the handle remains at the down position.
15

KEEL CUTTER N2600

11

Checking before starting hydraulic unit
1

■Check the hydraulic oil
・Check the oil through the oilcheck window of the oil tank.
・The oil level should be between
H and L of the oil check window.

2■Add hydraulic oil
・If necessary, remove the cap fromthe tank and add hydraulic oil.
・"Idemitsu Super Hydro 32A" orequivalent oil should be used.
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.

Rubber packing (A471)

Flower shape cap(with the packing)The hydraulic unit must be placed in the ﬂattest place possible.
(maximum inclination angle: 10 degrees)

KEEL CUTTER N2600

16

3■Check the fuel tank・Add gasoline if necessary.

4■Check if the air cleaner is clean
・Clean it if necessary.

MaintenanceEvery 50 hours Every 200 hours Every 300 hours

Engine oil change○※

Air cleaner cleaning○○

Fuel strainer cleaning
Spark plug cleaning○

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 10W30" or equivalent should be used.
Drain the gasoline completely if the engine is not used for a long time.
Thoroughly read Engine Operation Manual before using the engine.

12

Connecting couplers■Connect the couplers of the hydraulicunit and the hydraulic hose.
・After connecting the couplers, slide
the outer part of the female coupler
to prevent the couplers from being
disconnected.

Male coupler

17

Female coupler

KEEL CUTTER N2600

13

Starting hydraulic unit
1

OFF

ON

OFF

Switch leverON

Oil pressure gauge■Move the switch lever of the unit
to "OFF" position.

Switchingvalve

Oil ﬂow

2

OFF

ON

Run

■Move the clutch to "Stop" position.
Stop
Run

Stop

3
■Turn on the engine switch of thehydraulic unit.

4■Open the cock lever.
Cock lever
Close

5

Close

Cock lever[Close][Close]■Start theengineOpen

Open[Open][Open]

・Confirm the safety before starting
the engine.

KEEL CUTTER N2600

18

6■Warm-up operation
Run

Stop

・Keep the clutch of the main body at "Stop"
position, then move the switch lever to "ON"position and perform warm-up operation for
10-15 minutes (adjust throttle lever to slow).

※If the oil temperature is low, performance ofthe hydraulic motor can be degraded, causingpressure rise.

7

OFF

Switch leverON■Move the switch lever to "ON"Oil pressure gauge

・Adjust the throttle lever to fast (max).

Switchingvalve

When you are going to move the switch
lever to "ON", make sure the blade doesn't
touch the pipe and warn the workers fortheir safety.

Oil ﬂow

8

Cock lever

Open■Break-in operation

Close

・Move the clutch to "Run" position and run the machine 200300mm without lowering[Close]
the blade.
[Open]※By performing break-in operation, you can prevent the cutter
from being driven oﬀ its track. The V-belts are loosened after
the break-in operation, so retighten the belts after the operation.

14

Spraying water■Spray water・Open the cock lever andspray water on the blade.

It is a must to spray water to the cutting blade (diamond blade).
If you don't do that,the blade will be damaged and its useful life will be shortened.
19

KEEL CUTTER N2600

15

Starting machine1■Ratchet wrench・Attach the supplied ratchet
wrench on to the blade
lowering shaft.

2
Up

Down

■Lower the blade
・Turn the ratchet wrench tolower the blade and cut
through the pipe wall.
Ratchet wrench3■Check the depth・Rotate the roller bumper withbare hand to check the depth.
Stop lowering the blade when
the roller bumper becomes
unrotatable.
Roller bumper
Do not touch the rotating parts.
Wear safety goggles during cutting to protect eyes fromcut oﬀ dust.

KEEL CUTTER N2600

20

4■Move the clutch to "Run" position andrun the cutter around the pipe

Run

Stop

During cutting, check if the belts
are tight and the blade is runningon the right course.

blade
wedge

5

In case of cutting buried pipe, thediamond blade may get caught inthe cut pipe as the cutting comesto the end, causing damage to theblade. To prevent this, drive inwedges before and after the blade.

Cock lever■Complete the cut

Open

Close

・After the cutting is done, move the clutch to "Stop" position[Close]to stop the run.
[Open]
・Lift up the blade with the ratchet wrench.

6

OFF

Switch leverON

Oil pressure gauge■Move the switch lever to "OFF".
Switchingvalve

Oil ﬂow

7■Slow down and stop the engine
・Ensure the blade doesn't touch the pipe. If it does, theblade may get damaged.

21

KEEL CUTTER N2600

16

Removing machine from pipe1■Remove the hydraulic motor
・Remove the hex socket headbolt M12x30 using supplied
hex wrench 10mm.

2■Remove the driven shaft andhook assy.
・Fit the supplied ratchet wrench
to the end of the long screw andturn the wrench clockwise toloosen the V-belts and remove
the driven shaft assy.

3■Remove the guiding unit fromthe guide・Loosen the bolts and nuts inreverse order to remove theguiding unit.

4■Disconnect the coupler from the cock lever
・Release the pressure in the water tank before disconnecting
the coupler. It is dangerous if the pressure remains in thewater tank.

5■Remove the machine from the pipe
・Disconnect the extension chain from the chain attached tothe machine.

6■Remove the guide ring・Remove the guide ring in reverse order to attaching it.

KEEL CUTTER N2600

22

17

Pipe stands■Type of stand and applicable diameter・Applicable pipe diameter

Cut

Diameter
Pipe stand (L) φ118～φ1554mm■How to use pipe stands
・Pipe stands are used when the pipe is cut on the ground.
・Use one each stand at both ends of the pipe, and one each at bothsides of the cut (the stands should not get in the way of attaching themachine and cutting the pipe).
ゴムコロ
Cut

300～450

75～250 500～700

管台本体

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

23

KEEL CUTTER N2600

18

Maintenance
After each use, wash away cut oﬀ dust and dirt. If they remain on
the machine, they will get hard to remove and cause troubles.
The blade and the rotating parts are hot immediately after operation.
■After use (washing with water), lubricate rotating parts.
Lubricate the following parts:
・Drive pulleys
・Driven pulleys
・Hook Assy: wheels
・Hook Assy: long screw
・Chain attached to the machineand extension chains

・Wheel (large)
・Clutch・Guiding unit
・Cutter shaft
・Blade lowering shaft

Hook assy

First driven shaft
Driven pulley

Clutch(oﬀ)

V-beltGuide ring

Cutter cover

blade lowering shaft

Drive shaft pulley
Gear case

Adjusting collar

Bracketﬁxing bar

Cutter shaft

Hydraulic motor
Roller bumper

Wheel (large)
Guide rollers

Chain adjusting shaft

Guiding unit

Main components of the machine
KEEL CUTTER N2600

24