‫ ޓޓޓޓޓޓޓޓޓޓ‬- Note ‫ޓ‬Be sure to hand this operation manual to the user.
‫ޓ‬Carefully read through the manual before using the machine
to ensure safe and effective use.
‫ޓ‬Be sure to keep the manual where the operator can refer toit whenever necessary.

٨

٨

٨

Be sure to observe the Safety Precautions described below to prevent accidents such as fire, electric
shock and injury.
Read these Safety Precautions carefully before using the machine, and operate the machine according
to the instructions.
Do not use the machine in any way other than as described in this operation manual.

‫ޓޓޓޓޓޓޓޓޓޓޓޓ‬CONTENTS
1. Safety Precautions
2. Precautions when using the Portable Groover H
3. Main parts, Specifications, Standard accessories

P. 1
P. 3
P. 4

4. Setting up‫ޓޓޓޓ‬Ԙ Setting up‫ޓޓޓޓ‬ԙ Attaching to the pipe threading machine‫ޓޓޓޓ‬Ԛ Setting the pipe

P. 5
P. 8
P. 8

5. Operating Instructions‫ޓޓޓޓ‬Ԙ Operating the pump
ԙ Adjusting the depth of the groove‫ޓޓޓޓ‬Ԛ Grooving‫ޓޓޓޓ‬ԛ Checking the dimensions

P.11
P.11
P.12
P.13

6. Before requesting repairs or servicing / Troubleshooting‫ޓޓ‬
7. Daily inspection, maintenance
8. Requesting repairs

P.14
P.15
P.15

㧍 WARNING
Definitions of‫ޓޓޓޓޓޓޓޓޓޓ‬and㧍 CAUTION

㧍 WARNING
In this operation manual, warnings are divided into ‫ޓޓޓޓޓޓޓޓޓ‬and 㧍 CAUTION .
‫ޓޓޓޓޓޓޓޓޓޓ‬:indicates actions which could possibily result in death or severe injury to the user
㧍 WARNING
if the machine is used incorrectly.
‫ޓޓޓޓޓޓޓޓޓޓ‬:indicates actions which could possibly result in injury to the user, or physical㧍 CAUTION
damage, if the machine is used incorrectly.
Even items described as 㧍 CAUTION, could have serious results under certain conditions.
Be sure to observe these warnings carefully, as they greatly affect safety.
࡮If this operation manual is lost or damaged, promptly order a replacement from your distributor or oursales department.
࡮Parts and specifications are subject to change without prior notice due to improvements in quality,
performance or safety standards. In such cases, the contents, photographs, illustrations, etc. in this manual
may be different to the product you have purchased.

‫ޓ‬1. Safety Precautions㧍

WARNING

1) Ensure you use the correct voltage.
-Be sure to use the voltage indicated on the name plate of the main unit or in the operation manual.‫ޓ‬
If the voltage is different from the voltage indicated, overheating, smoke or fire may occur.
2) Check the switch is OFF, before inserting the plug into the power supply socket.
-If the plug is inserted into the power supply when the switch is ON, the machine may start operation abruptly,
and is liable to cause accidents. Be sure to check the switch is OFF.
3) Be sure to avoid electric shock.
-Do not touch the plug with wet hands.
-Do not use the machine in rain or in places where water can easily get into the machine.
-Be sure to ground the machine to avoid electric shock.
4) Take notice of conditions at the work site.
-Do not use the machine in rain, humid or damp places, or places where water can easily get into the machine.
Humidity will lower insulation of the motor and cause electric shock.
-Do not use close to flammable fluids or gases, such as gasoline and thinner. Doing so could lead to fire or explosion.
5) Use designated accessories and attachments.
-Do not use accessories and attachments other than those designated in the operation manual or ourcatalogues. Accidents or injuries might result.
6) In the following cases, turn the main unit OFF and pull the plug out of the power supply socket.
-When the machine is not in use or parts are changed, repaired, cleaned or inspected.
-When accessories are changed.
-When hazards are expected (including electric power failure)
When the plug is inserted, the main unit may start operation unexpectedly, causing accidents.
7) If any abnormality is noticed, stop operation immediately.
-When the machine does not operate smoothly or abnormalities such as unusual smells, vibration ornoise are detected, immediately stop operating the machine.
-Check symptoms against the items in Troubleshooting at the end of this manual, and follow the appropriate
instructions.
-If the machine is used continuously it might lead to overheating, smoke or fire, resulting in accidents or injury.
If overheating or smoke from the main unit occurs, do not attempt an overhaul but ask for an inspection
and repair.
8) Keep the work site clean.
-Ensure you keep the worktable and the work site in good order, and well lit. A cluttered site and worktable areliable to cause accidents.
9) Do not let unauthorised personnel come near the machine.
-Do not let anyone other than authorised personnel touch the main unit or the power supply cord or operate themachine.
-Do not let people other than authorised personnel enter the work site, especially children. Injuries might occur.
10) Do not use the machine with force.
-Use the machine only for its designated purpose.
To assure safe and effective operation, operate according to the capacity of the main unit. Applying excessive
force may not only cause damage to the product but also accidents.
-Do not use the machine in the any way that could cause the motor to lock, or cause smoke or fire.
11) Wear neat clothing.
-Do not wear neck ties, clothes with open sleeves, loose clothing or accessories such as chains, necklaces, etc.,
which could get caught in the rotating parts.
-When working outdoors, it is recommended that you wear rubber gloves and non-slip shoes. Slippery gloves andshoes are liable to cause injuries.
-Cover long hair with caps or hair nets to prevent them from getting caught in rotating parts.
-Wear safety caps, safety shoes, etc. according to the working environment.

-1-1. Safety Precautions㧍

WARNING

12) Do not work in an unnatural posture.
-Keep a firm footing and balance to avoid falling over and injuring yourself.
13) Remove tools such as wrenches.
-Before turning ON the switch, check that tools used for inspection and adjustment have been removed.
If you use the machine when tools are left inside it, accidents and injuries may occur.
14) Operate the unit with great care.
-Always work with great attention to how you handle and operate the machine and the surrounding
conditions. Carelessness may result in accidents and injuries.
-Do not operate the machine when concentration is lowered such as when tired, after drinking alcohol,
when sick, affected by medicines, etc.
15) Handle the power cord with care.
-Do not carry the product by the cord, or pull the plug out of the socket with the cord.
-Do not place the cord near heated objects, fats & oils, cutters or objects with sharp edges.
-Take care not to pull or tread on the cord, or apply unnecessary force resulting in damage to the cord. Doing so
could lead to electric shock or a short-circuit resulting in fire.
16) Perform careful maintenance daily.
-When changing accessories and parts, follow the operation manual.
-Periodically inspect the power supply cord and plug. If damaged, ask your distributor or our sales
department for repairs.
-If an extension cord is used, inspect the cord periodically and, if damaged, replace it. If extension cords are used
outdoors, use extension cords designed for outdoor use to prevent electric shock, short-circuit or fire.
-Keep parts used for gripping the machine dry and clean and free of oil and grease. Slipping may cause injury.
17) Check for damaged parts.
-Before using the machine, carefully check for damage to the protective cover and other parts, andcheck both normal operation and specified functions.
-Check for any abnormalities such as in adjustment of movable parts, tightening, damage to parts, andall parts affecting operation.
-Do not use the machines if the stop and start switches do not work.
-In replacing or repairing a broken protective cover and other parts, follow the instruction manual.
If no instructions are specified in the instruction manual, ask your distributor or our sales department for repairs.
18) Store carefully when the machine is not in use.
Store in a dry place away from children and locked with a key.
19) For overhaul and repair of the machine, ask an appointed REX agent.
-Our products comply with corresponding safety standards. Do not remodel.
-Be sure to ask your distributor or our sales department for any repairs.
-If repairs are carried out by unskilled or unqualified personnel, the performance of the unit will be adversely
affected and may result in accident or injury.

-2-2. Precautions when using the Portable Groover H
㧍 WARNING
1) Mount the groover on specified pipe threading machines that have been tested forsafety. (See Table 1, Pg. 5) Do not attempt to use on any other machines.
The correct rotational direction is the direction when threading.
2) Use the rollers that match the pipe. (Refer to Table 2 on Pg. 6)‫ޓ‬The standard roller set can be used only for 2"- 6" steel pipe (SCH 10-40). It cannot be used
for thin wall stainless steel pipes or pipes of a different size. Since applicable sizes aremarked on the rollers, replace the rollers according to the size of the pipe.
3) Never touch rotating parts or workpieces.
‫ޓ‬To prevent injury to hands and fingers, do not touch rotating rollers and pipes with yourhands.
4) Attach the mount kit that matches the pipe threading machine to be used. (See Table 1, Pg. 5)
If a different type of mount kit is attached, it with not be possible to set it on the pipe
threading machine correctly.
5) Make sure the threading machine rotates in the right direction.
The direction for threading is the right direction. If it is in the reverse direction, the pipe will
fall out, which can be very dangerous.
6) The pipe must be set correctly. (See Fig. 14, Pg. 10)
Set the pipe so that it is in the right direction and at 0.5qto the axis of the machine's
main shaft.
If it is thrown into reverse, the pipe will fall out, which can be very dangerous.
7) Make sure you operate the handle on the hydraulic pump correctly. (See Table 5, Pg. 13)
If you operate the handle too quickly, the pipe may be distorted and/or the machine will
be damaged.
8) After completing the groove, be sure to check on the size of the groove with a groove gauge
or calipers, etc. (See Table 6, Pg. 13, Roll Groove Standard Machining Size)
9) Be sure to place the pipe threading machine and pipe stand on a stable, flat surface.
Avoid using the pipe threading machine and pipe stand in an unstable position or
the machine and pipe may fall over.

-3-3. Names of parts, Standard specifications, Accessories‫ ع‬Names of parts
Hydraulic valve
SpacerPush knob

Adjusting nut

Main shaft nut
Hydraulic pump
Pump Handle
CylinderConnecting shaft

Roller shaft
Safety cover

Upper roller

Guide roller

Main shaft‫ ع‬Specifications
Model Name

Lower roller
Fig. 1

RG-RH

Grooving Capacity1" - 16" Schedule 101" - 12" Schedule 40
Standard Model
For 2" - 6" Schedule 10 - 40

Net Weight (kg)35. 8kg (including connecting shaft)Standard accessories:1
Connecting shaft
Socket head cap screw (M10 x 25) : 8:8
Spring washer (10mm)

Optional
Accessories

1" - 11/2" Roller Set (Schedule 10 - 40)
2" - 6" Roller Set (Schedule 10 - 40): Also as standard accessory8" - 12" Roller Set (Schedule 10 & 8" Schedule 40)
10" - 12" Roller Set (Schedule 40)
14" - 16" Roller Set (Schedule 10)
1" - 11/2" Main Shaft
1" - 6" Pipe Support
8" - 12" Pipe Support
Roller set for thin wall stainless steel (1" - 11/2", 2" - 3", 4" - 6")
Mount kit
M-HR1 REX 50A(N50A, NP50A, NR50A, P50A, R50A)
M-HR2 REX 80A(S80A, N80A, NP80A)
M-HR3 REX 100A (N100A)
M-HE1 #300(#300)Spacer 1" - 6": Also as standard accessory
Spacer 8" - 12"
Spacer 14" - 16"-4-

Hex wrench (8mm) : 1
T wrench (5mm) : 1
Spanner (30mm) : 1

4. Setting Up
1. Setting Up
1) Attaching the Mount Kit:
Fix the mount kit to the main body securely
with the eight bolts (M10 x 25) and theircorresponding spring washers (10 mm). (Fig. 2)
㧍 CAUTION

㨯Always attach the mount kit that matches thepipe threading machine used. The mount kit
cannot be attached to the pipe threadingmachine correctly if a mount kit for adifferent type of machine is used.
Which pipe threading machine it can be
attached to is indicated on the mount kit.
Attach the mount kit in the correct direction.
(Fig. 2)
㨯If the mount kit is attached in the opposite
direction, an unnecessary load will be applied
to the threading machine's chuck, thereby
resulting in damage.

Mount Kit

Mount Kit
Spring washer (10mm)

Hook

Bolt (M10 x 25)
Fig. 2

Table 1 Mount Kit
Code No.
341560Name
M-HR1 REX 50A

341561341562341563

M-HR2 REX 80A
M-HR3 REX100A
M-HE1 #300

For use with
N50A, NP50A, NR50A, P50A, R50A, NPG150A(Cannot be used on the NT50.㧕
S80A, N80A, NP80A
N100A
#300

-5-

4. Setting Up
2) Attaching the Connecting Shaft:㨯Place the connecting shaft fully over the main
shaft, then fix it in position by tightening thetwo screws against the flat surface of the main
shaft. (Fig. 3)

Fixing screw㧍 CAUTION㨯Be sure to tighten the screws against the flatpart of the main shaft as illustrated. If thescrews are tightened against the cylindricalpart, they will come loose while grooving,
and the main shaft will not turn properly.

Main shaft
Connecting shaft

3) Replacing the Roller Set:
㨯The standard roller specifications are 2" to 6"
for steel pipe.
Where other sizes of steel pipes are to bemachined, replace the roller set (upper andlower roller). The appropriate sizes arestamped on the roller. (Fig. 4)

2Ð6

2Ð6

㧍 CAUTION

Fig. 32-6

Size mark2-6

㨯Be sure to replace the upper and lower rollers
as a set. If the wrong combination is used,correct grooving will not be possible.

Fig. 4

Table 2 Roller Set
Code No.
341113Name
1" - 11/2" Roller Set
2" - 6" Roller Set(Standard accessory)Mark
1 - 11/2

For use with
Schedule 10 - 40 steel pipe

2-6Schedule 10 - 40 steel pipe

3411118" - 12" Roller Set

8 - 1234113710" - 12" Roller Set

Schedule 10, 8" Schedule 40 steel pipe
Schedule 40 steel pipe
(Maximum wall thickness : 10. 3mm)

34113834111834111934112014" - 16" Roller Set
SUS1" - 11/2" Roller Set
SUS2" - 3" Roller Set
SUS4" - 6" Roller Set

341133Upper roller 8 - 12
Lower roller10 - 12

14 - 16
SUS 1 - 11/2
SUS 2 - 3
SUS 4 - 6

Schedule 10 steel pipeThin wall stainless steel pipe Schedule 5 - 10

*When using the 1" - 11/2" Roller Set (Code No. 34113), the main shaft (341141) for 1" - 11/2" rollers is
required as a set.

-6-

4. Setting Up
Replacing the Roller Set (Figs. 5, 6)‫ع‬Removing the rollers
1) Loosen the bolts and turn the safety coverclockwise. (Figs. 5, 6)2) Remove the upper roller by loosening the fitting
screws on the upper roller and pulling out theroller shaft. (Fig. 6)3) Pull out the lower roller by loosening thehexagonal nut on the main shaft and removing
the washer. (Fig. 7)

Fig. 5‫ع‬Installing the rollers(Apply the above procedures in reverse)
1) Match the key on the roller shaft with the key
groove in the upper roller and firmly lock with thefitting screw.
2) Insert the lower roller into the main shaft, andfirmly lock with the hexagonal nut.
3) Replace the safety cover and tighten the screws.
* Before setting up, clean the inside surface of theroller and the shaft of waste. Apply grease to theentire circumference of the upper roller shaft andthe inside surface of the lower roller.

Fig. 6* Be sure to change the upper/lower rollers as a set.

Replacing the Main Shaft
Fig. 7

Table 3 Main Shaft
Code No.
341141Name
1"-11/2" Main Shaft

Mark
None

1) Remove the rollers in the order above.
2) Loosen the fixing screw on the main shaft nut, turnthe nut anti-clockwise and remove from the main
shaft.
3) Press the main shaft and remove from the mainbody.
4) Installation: Insert the main shaft into the main
body. Then screw in the main shaft nut as far as it
will go and tighten the fixing screw. Bearing plate,then tighten it firmly with the 4 bolts.

For use with
1"-11/2"

Bearing plate

Fixing screw
Bolt

Push
Main shaft

㧍 CAUTION

㨯Clean the main shaft thoroughly with a cloth
before setting up.
Avoid letting iron powder or foreign bodies
get inside the main unit, as this will damage
the machine.

-7-

Main shaft nut

Fig. 8

4. Setting Up
2. Attaching to the Pipe Threading Machine㧍 WARNING
Front chuck㨯Be sure to place the pipe threading machineand pipe stand on a flat stable surface.
Avoid using the machine and pipe stand in an
unstable position since they may fall over.

Carriagesupport bar

1) Fully open the front chuck.
2) Pull the carriage fully towards the front chuck.
(Fig. 9)3) Place the mount kit on the carriage support bar,and tightly secure the connecting shaft in thefront chuck. (Fig. 10)
4) Place the hook over the carriage support bar
and fix it in position.
Tighten the bolt on the hook securely.

Carriage
Fig. 9

Mount base㧍 CAUTION

Bolt
Hook

㨯Use the mount kit that matches the pipe
threading machine you are using.
㨯Lift the machine with 2 people or use a hoist.
The machine is heavy. Lifting it by yourself
could result in injury.

Carriagesupport bar
Fig.10The following pipes cannot be machined tothe correct size:

3. Setting the Pipe

㨯The pipe end isslanted.

㧍 CAUTION

㨯The pipe to be machined should be cut square,
have no step difference, and be free of
deformaties.
If the pipe end is slanted or has a stepdifference, or if the pipe is deformed, it cannot
be machined to the correct size of groove. (Fig.
11)

㨯There is a stepdifference.

㨯The pipe is deformed.
Fig.11

㧍 WARNING

㨯Use an approprite pipe stand or there is adanger of the threading machine falling over orbeing damaged. (See Table 4, Pg. 9)-8-

4. Setting Up
Table 4 Machinable Pipe Length
Maximum
Maximum
MachinableMachinable
LengthMachinable Length
Pipe Size Pipe Length (MIN)of Pipe without aof Pipe Using 1
Pipe stand
Pipe Stand
1"-2"
120mm
800mm
2000mm21/2"-4"
120mm
700mm
2000mm
5"-6"
120mm
600mm
1500mm8"-16"
120mm
500mm
1000mm1) Setting a pipe
㨯Insert the pipe to be machined until itcomes into contact with the lower roller
flange (collar). (Fig. 12)

Contact with the flange (collar)

㧍 WARNING

㨯If you use pipes longer than those shown in
Table 4 above, use 2 stands to support thepipe. (Fig. 13)

Pipe㨯Failure to do so may result in the machineand pipe falling over, thereby causing an
accident.

Lower roller
FlangeFig.12

2) Pipe height adjustment
㨯Since the pipe threading machine is approx.
2ࠑoff horizontal, adjust the pipe standheight so that the pipe is 2 degrees lower.
(Fig. 13)
L : Entire pipe length
3/4 L

Pipe

Pipe stand2ࠑlowerthan horizontal

Fig.13-9-

4. Setting Up
3) Pipe shifting adjustment
㨯Adjust the pipe by shifting it 0.5ࠑto the main
shaft.
Pipe centre

㧍 WARNING

0.5q

㨯If the pipe is set straight on the main shaft
or set in the opposite direction, it will come
off while grooving and fall off, which could
be dangerous.

Centre of main shaft

Pipe threading machine- 10 -

Fig.14

5. Operating Instructions
1. Operating the pump
1) Check that the hydraulic pump valve is in the
ON position. (Fig. 15)

Hydraulicpump valve

OFF2) Lift the pump handle firmly in one go andthe upper roller will be lowered onto thepipe. (Instant drop) (Fig. 16)

ON3) Keep lifting the pump handle up and down
until you have finished processing the pipe.
The upper roller will gradually press deeper
into the pipe to create a groove. (Fig. 16)

Fig.15
Pump hundle

4) When you set the hydraulic pump valve toOFF, the upper roller will return to its resting
position. (Fig. 15)
Instantdrop

2. Adjusting Groove Depth1) Loosen the hydraulic pump valve, and pull
the pump handle up firmly to engage theupper roller lightly with the pipe. (Fig. 17)

Upperroller
Fig.162) Place the spacer on the upper surface of thecylinder and lightly tighten the adjustingnut. (Fig. 18)

Upper Roller* Hold the spacer in position so that the
thickness matches the size of the pipe you
are working on. (Fig. 20)* The spacer is used as a reference when
adjusting groove depth. After an initial trial,
use the adjusting nut to fine-tune to theappropriate groove depth.
* If the groove is too shallow, turn the adjustingnut anti-clockwise to increase the depth of
the groove. Conversely, turn the nut
clockwise to make the groove shallower.
* One sub-division of the larger divisions on theadjusting nut is equivalent to approximately
0.3 mm. (Fig. 19)

Engage withpipe

Fig.17TightenAdjusting nut
Spacer
Cylinder3. Loosen the hydraulic valve and remove thespacer from the cylinder.

Fig.18SpacerDeeperSCH

1-

12 /12

4-

4-

6

Shallower40

63
Hold spacer in position
with thickness matchingpipe size.

Adjusting nut

Fig.20

Fig.19- 11 -

5. Operating Instructions
3. Grooving
1) Turn the hydraulic pump valve to the ON
position, and pull the pump handle up quickly
and firmly to engage the pipe lightly with theupper roller and then raise the pump again.

Upper Roller

2) Turn the push knob on the guide roller tolightly engage the guide roller with the pipe.
In this position, tighten the knob a further halfturn to push the guide roller against the pipe.
(Fig. 22)
The amount you tighten depends on the pipe.
Tighten lightly for thin pipes; more for thick or
hard pipes.
Ascertain the most suitable amount you should
tighten according to the pipe's size andmaterial. If you tighten too much, the end of
the pipe will flare; if not tightened enough, thepipe may fall out when working on it.

Pipe
Fig. 21

Fig. 223) If the threading machine has a switch forchanging directions, use in the forward(normal) direction position for cutting threads.
(Fig. 23)
㧍 CAUTION㨯If you use the machine in the opposite
direction to threading (reverse), the pipe
may fall out, which can be very
Correct
direction4) Turn the threading machine on to start thepipe rotating.
Allow the pipe to rotate several times toensure that the pipe does not slip away fromthe lower roller flange.

Fig. 23

If the pipe slips out,
immediately turnthe switch OFF.

㧍 WARNING

㨯Should the pipe slip off the lower roller,
turn the threading machine OFF
immediately to stop it rotating. If the pipe
slips out while still rotating, the pipe will
become detached from the lower roller
and could fall out, which is very dangerous.
(Fig. 24)
Loosen the hydraulic valve and reset thepipe. If the pipe slips out, shift the pipe alittle more.

Pipe slipping out

Pipe

Lower roller- 12 -

Fig. 24

5. Operating Instructions5) Use the hydraulic pump to start the grooving
process. (Fig. 25)‫ޓ‬Refer to the table below for how to operate
the pump safely.
Schedule 10
Schedule 40

Pump hundle

Push the handle once for eachrotation of the pipe.
Push the handle once for every
two rotations of the pipe.
Fig. 25

Table 5‫ޓ‬If the handle is pushed too quickly, the pipe may
become distorted and the machine may break
down. Be careful to use the handle correctly.

Adjustingnut
Cylinder6) As soon as the adjusting nut touches the uppersurface of the cylinder, switch the machine OFF
and stop pumping. (Fig. 26)
Fig. 26

4. Checking the dimensions‫ޓ‬Be sure to check the depth of the groove and thedimensions of each part of the machined pipe
according to Table 6 below.
㧍 CAUTION

࡮The specified size for each part of the pipe
may differ slightly, depending on the joint.
࡮In such a case, make sure you check themachining size according to the specified
size table for the joint used.

L

W

OD

G
Fig. 27

Table 6 Roll Groove Standard Machining Size
NominalA

B

Pipe outer diameter(O.D)

Seal surface width
(L)

25

1

34.0

16.0

32

11/4

42.7

16.0

40

11/2

48.6

16.0

50

2

60.5

16.0

65

21/2

76.3

16.0

80

3

89.1

16.0

100

4

114.3

16.0

125

5

139.8

16.0

150

6

165.2

16.0

Groove width
(W)
+0.4
- 0.9
+0.4
- 0.9
+0.4
- 0.9
+0.4
- 0.9
+0.4
- 0.9
+0.4
- 0.9
+0.4
- 0.9
+0.4
- 0.9
+0.4
- 0.9

- 13 -

Groove diameter
(G)

7.1

±0.8

30.4

0-1

7.1

±0.8

39.1

0-1

7.1

±0.8

45.0

0-1

8.7

±0.8

56.9

0-1

8.7

±0.8

72.2

0-1

8.7

±0.8

84.9

0-1

8.7

±0.8

110.1

0-1

8.7

±0.8

135.5

0-1

8.7

±0.8

160.8

0-1

6. Before requesting repairs or servicing
If there are any abnormalities with the unit, check the following and inform your distributor or our sales
department.
㧍 WARNING

If any problems are not dealt with below, do not attempt to overhaul or repair the unit by yourself, butcall your distributor or our sales department.
If repairs are performed by untrained or unskilled personnel, optimum performance cannot be attained,
and accidents and injuries may occur.

‫ ع‬Troubleshooting
Problem࡮The width of the groove is too‫ޓ‬narrow or too wide.
࡮The groove zigzags.
‫ޓ‬The groove is not parallel with‫ޓ‬end of the pipe.

Possible Causes
࡮The roller set doesn't match the pipe‫ޓ‬size.
࡮The pipe has been cut at an angle.
࡮The pressure of the resin guide roller
is too weak.

࡮The diameter of the groove is‫ޓ‬not consistent around the‫ޓ‬whole of the pipe.

࡮The pipe is elliptical in shape.
࡮Speed of grooving is too fast.

࡮The pipe end flare is too great ࡮Guide roller pressure is too strong.
‫(ޓ‬bell mouth).
࡮The roller set differs from pipe size.
࡮ The pipe support is too high.
࡮The speed of grooving is too fast.
࡮The pipe shift angle is too large.
࡮The pipe slips off the lower‫ޓ‬roller when grooving.

Corrective measures࡮Replace roller set with one that‫ޓ‬matches the pipe size.
࡮Cut the pipe at right angles.
࡮Retighten the push knob and engage
the guide roller with the pipe a little
more strongly.
࡮Make sure the pipe is perfectly‫ޓ‬circular.
࡮Operate the pump a little more slowly.
࡮Loosen the push knob so that it
contacts the guide roller more lightly.
࡮Replace the roller set with one that‫ޓ‬matches the pipe size.
࡮Adjust the height of the pipe support‫ޓ‬so that the pipe is 2ࠑlower than the‫ޓ‬horizontal.
࡮Operate the pump a little more slowly.
࡮Adjust the pipe shift angle to 0.5ࠑ.

࡮The pressure of the resin guide roller‫ޓ‬is too weak.

࡮Re-tighten the push knob and attach
the guide roller to the pipe a little
more strongly.
࡮The pipe shift is in the opposite direction. ࡮Shift the pipe in the right direction.
࡮The threading machine is rotating in the ࡮Correct the direction of rotation.
‫ޓ‬wrong direction.
࡮The pipe is too straight on the lower
࡮Make the shift angle a little larger.
‫ޓ‬roller, or the angle of the shift is too‫ޓ‬small.
࡮The pipe stand is too high.
࡮Adjust the height of the pipe support
so that the pipe is 2ࠑlower than the‫ޓ‬horizontal.

࡮The pipe slips while it is being ࡮The knurling on the lower roller is‫ޓ‬processed and doesn't rotate ‫ޓ‬clogged up or worn.
‫ޓ‬smoothly.
࡮The speed of grooving is too fast.

࡮Use a wire brush to clean up the‫ޓ‬knurling, or replace the lower roller‫ޓ‬as necessary.
࡮Operate the pump a little more slowly.
࡮Loosen the nut and process the pipe‫ޓ‬again.
࡮Ask for repairs.

࡮Operating the pump doesn't‫ޓ‬increase the depth of the‫ޓ‬groove.

࡮The adjusting nut is too tight.

࡮Oil leaks from the hydraulic‫ޓ‬unit.
࡮Groove depth is too shallow.

࡮The cylinder packing is damaged.

࡮Ask for repairs.

࡮The pressure of the hydraulic unit is too
weak.

࡮Ask for repairs.

࡮The hydraulic unit doesn't have enoughoil.

࡮Ask for repairs.

࡮The upper roller doesn't go
right down.

࡮The pump valve and/or packing are‫ޓ‬damaged, resulting in insufficient‫ޓ‬pressure.

- 14 -

7. Daily inspection, maintenance㧍 WARNING

Before carrying out any inspections or machine maintenance, make sure you unplug the threading machine.
If the machine suddenly starts to operate while checking it, it may lead to accidents and injury.

A. Overall inspection

C. Grease nipple
C. Grease nipple

B. Inspection of rollers
Fig. 28

1) Inspect the fitting screws (A)‫ޓޓ‬Inspect screws and nuts on each part of the machine, and retighten if loose.
‫ޓޓ‬Among other things, check the screws on the upper roller and the nuts on the lower roller.
If the screws are loose, the roller will be damaged.
‫ޓޓ‬Check that the screws on the mount kit are tightly fastened.
2) Inspect the threading machine's electrical connections and cables (B)‫ޓޓ‬Check for damage to the plug and power cord, and replace if necessary.
‫ޓޓ‬To prevent electrical leakage and shock, ensure the machine is properly grounded.
3) Inspect the rollers (C)‫ޓޓ‬Check that the rollers match the type of pipe being processed or normal grooving will not be possible.
‫ޓޓ‬Check for chips or cracks in the rollers. If they are damaged or broken, they will not perform correctly ‫ޓޓ‬‫ޓ‬and the machine will be damaged. Replace them if necessary.
4) Periodical lubrication (C)‫ޓޓ‬To prevent burning or galling, be sure to lubricate regularly.
‫ޓޓ‬When replacing rollers, apply grease to the entire circumference of the upper roller shaft and to the ‫ޓޓޓ‬‫ޓ‬inside of the lower roller.
‫ޓޓ‬Remove the upper roller every two weeks and replenish the bearings with grease.
‫ޓޓ‬Apply grease to the grease nipple on the side of the machine.
5) Clean after use (A)‫ޓޓ‬To prolong the life of the machine, be sure to clean the machine and the rollers each time after you use it.
‫ޓޓ‬

8. Requesting repairs‫ޓ‬This machine is produced with great precision; therefore, should the machine fail to operate normally, do not
repair it by yourself, but call us for repairs.
‫ޓ‬If parts are required or if you have any questions, please contact us at your earliest convenience.

- 15 -

A Guarantee and Exemption from Liability
1. Should the machine happen to break down for no apparent reason despite normal and correctuse, repairs and service parts shall be provided free of charge as outlined below.
· Guarantee period, repairing dates, procedures and methods for providing repairs and service
parts shall be decided in consultation with the customer and distributor.
· Repairs and service parts may be charged.
· Repairs may be charged under the following circumstances:- if the machine has not been used according to the instructions in the Operation Manual.
- if it has been used for anything other than its intended purpose.
- if it has not been repaired according to the Operation Manual or if it has been remodeled.
- if blades or consumables need replacing.
- if the machine has been handled in an inappropriate way.
2. REX will accept no responsibility under the following circumstances:- fire, damage from flood, earthquakes, lightning or other natural disasters.
- malfunction or accident resulting from pollution or abnormal voltage.
- when the machine has not been operated according to the Operation Manual.
- when the machine has been used incorrectly, repaired or remodelled inappropriately.
3. Any costs incurred by the manufacturer shall not exceed the purchase price of the machine.

REX

REX INDUSTRIES CO.,LTD.
Overseas Sales Dept. & Factory
1-9-3, Hishiya-Higashi, Higashi-Osaka 578-0948 Japan
Tel. +81-(0)72-961-9820 Fax +81-(0)72-961-9878
http://www.rexind.co.jp

8Z210-E2

2202R0040• Product specifications subject to change without notice.