Wheeler-Rex 8991 User manual

OPERATION MANUAL
PIPE THREADING MACHINE
8991
Be sure to read this operation
manual before using the
machine.
Date of Purchase: Year Month
Distributor:
Note
- Be sure to hand this operation manual to the user.
- Be sure to keep the manual where the operator
can refer to it whenever necessary.
- To ensure safe and efcient use, read the manual
thoroughly before using the machine.
50/60 Hz

Safety Considerations
Precautions when using 8991
Main Parts, Standard Specications, Accessories, Options, and Their Applications
Getting Ready / Operation Guide
1. Transportation
2. Setting up
3. Cutting oil
4. Attaching and removing the die head
5. Self-opening Die head
6. Manual-open Die head
7. Setting Up the Pipe / Removing the pipe
8. Power supply
9. Checks before starting
10. Motor with braking system
11. Cutting pipes
12. Reaming
13. Carriage collision prevention mechanism
14. Improper use of a pipe wrench
15. Cutting threads (Self-opening Die Head)
16. Cutting threads (Manual-open Die Head)
17. Measuring threads with a gauge
Daily Inspection, Maintenance
Requesting Repairs
Servicing and Repairs, Troubleshooting
1
2
5
6
6
6
6
7
9
10
10
11
11
12
13
13
13
14
15
16
17
18
19
Thank you for purchasing a WHEELER-REX pipe threading machine.
Our product will give you years of high-precision processing and reliable service if you simply follow the instructions
in this manual carefully.
- To prevent accidents such as re, electric shock, injury etc., please be sure to observe the Safety Considerations
and Precautions when using 8991.
- Before using the product, therefore, make sure you read the manual from start to nish, paying particular attention
to the Safety Considerations and Precautions.
- To avoid accident and injury, never use the machine for any purposes other than those described in this manual.
Should you need further advice, contact your distributor or WHEELER-REX.
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CONTENTS
In this operation manual, warnings are divided into WARNING and CAUTION.
WARNING: indicates actions that could possibly result in death or severe injury to the user if the machine is used
incorrectly.
CAUTION: indicates actions that could possibly result in injury to the user, or physical damage, if the machine is
used incorrectly.
Even items marked CAUTION could have serious outcomes under certain conditions.
Be sure to observe these warnings carefully as they greatly affect safety.
Definitions of ARNING and CAUTION
- If this manual is lost or damaged, promptly order a replacement from your distributor or WHEELER-REX.
- Parts and specications 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.

1
SAFETY CONSIDERATIONS
WARNING
1. Ensure you use the correct voltage.
- Be sure to use the voltage indicated on the nameplate on the main unit or in this manual. If the voltage is different
from the voltage indicated, overheating, smoke or re 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 up abruptly and is liable
to cause accidents. Be sure to check the switch is OFF.
3 . Avoid electric shock.
- Never touch the plug with wet hands.
- Do not use the machine in rain or in places where moisture can easily get into the machine.
- Be sure to ground the machine to avoid electric shock.
4 .Be aware of the environment you are working in.
-Do not use the machine in the rain, in humid or damp places, or places where moisture 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 or paint thinner. Doing so might result in fire or explosion.
5 .Use designated accessories and attachments.
- Do not use accessories and attachments other than those designated in this manual or our catalogues. Accident or
injury might result if you do.
6 . In the following cases, turn the unit OFF and pull the plug out of the 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 a power failure),
- when the plug is inserted (the machine may start up unexpectedly, which could cause an accident).
7. If any abnormality is noticed, stop the machine immediately.
- If the machine does not operate smoothly, or abnormalities such as unusual odours, vibration or noise are detected,
stop operating the machine immediately.
- Check symptoms against the items listed under "Troubleshooting" at the end of this manual, and follow the
corresponding instructions. Continuing to use the machine may result in overheating, smoke or re, and may cause
accident or injury.
- If the unit overheats or produces smoke, do not attempt to overhaul it yourself but ask for an inspection and repair.
8 . Keep the work site clean.
- Ensure you keep workbenches and the worksite in good order and well lit. Cluttered worksites and workbenches
are liable to cause accidents.
9 . Do not let any unauthorised personnel near the machine.
- Do not let anyone other than authorised personnel touch the machine or the power cord, or operate the machine.
-Do not let anyone other than authorised personnel enter the work site, especially children. They could get seriously injured.
10 . Do not apply excessive force.
- To ensure safe and efcient operation, use within the capacity of the main unit. Applying force may not only cause
damage to the product but could also result in accident or injury.
- Do not use the machine in any way that could cause the motor to lock, or result in smoke or re.
11.Use the machine only for its designated purpose.
- Do not use the machine on pipes not specified in this manual. Using the machine for any purpose other than
threading pipes, such as fastening the pipe to a joint etc., will not only damage the machine and/or motor but could
also lead to accident or injury.
12 .Wear proper working clothing.
- Do not wear neckties, clothes with open sleeves, loose clothing, accessories such as necklaces, etc. Do up buttons
and zippers which could get caught in the rotating parts and result in serious accident or injury.
- When working outdoors, it is recommended that you wear rubber gloves and non-slip shoes. Slippery gloves and
shoes are liable to cause injuries. Do not wear scarves and cover long hair with caps or hair nets to prevent them
getting caught in rotating parts.
- Wear safety caps, safety shoes, etc. according to the working environment.
13 . Do not work in an unnatural posture.
- Keep a rm footing and balance to avoid falling over and injuring yourself.
14 . Remove tools such as wrenches.
- Before turning the switch ON, check that any 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.

2
SAFETY CONSIDERATIONS
PRECAUTIONS WHEN USING 8991
Threading
WARNING
15 . 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 accident or injury.
- Do not operate the machine when concentration is lowered such as when tired, after drinking alcohol, when sick or
affected by medicine, etc.
16 . Do not handle the power cord carelessly.
- Do not carry the machine by the cord, or pull the plug out of the socket with the cord.
- Do not place the cord near heated objects, fats and oils, cutters or objects with sharp edges.
- Take care not to tread on the cord, pull it or apply unnecessary force resulting in damage to the cord. Doing so may
result in electric shock, or a short-circuit may occur and cause a re.
17. 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 WHEELER-REX for
repairs. If you don’t do so, there is a risk of electric shock or short-circuiting and re.
- 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 re.
- Keep parts used for gripping the unit with your hands dry and clean, and free of oil and grease. If your hands slip,
you may be injured.
18 .Check for damaged parts.
- Before using the machine, carefully check for any damage to the protective cover and other parts, and check both
normal operation and specied functions.
- Check for any abnormalities such as adjustment of movable parts, tightening, damage to and installation of parts and
all parts affecting operation.
- Do not use the machine if it has a damaged power cord or plug. Doing so may cause electric shock or a short circuit
leading to re.
- Do not use the machine if the Stop and Start switches do not work properly.
- When replacing or repairing a broken protective cover and other parts, follow the operation manual. If no instructions
are specied in the operation manual, ask your distributor or WHEELER-REX for repairs.
19 . Store carefully when the machine is not in use.
- Store in a dry place away from children and locked with a key.
2 0 . 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 WHEELER-REX for any repairs. If repairs are carried out by unskilled or
unqualied personnel, the performance of the unit will be adversely affected and may result in accident or injury.
WARNING
1.Take care when handling the blades.
- To prevent accidents and injuries, take special care when handling blades such as dies, reamers, pipe cutters etc.
2 . Do not put your hands or face near rotating parts when the machine is in use.
- You could get caught in rotating parts or hit by scrap, resulting in accident or injury.
3 . Do not start on the next job while the machine is still rotating.
- When you turn the switch off, the machine will not stop rotating immediately. Perform the next job only after
checking that the machine has come to a complete stop. Failure to do so may result in accident or injury.
4 . Do not wear gloves when operating the machine.
- Gloves may get caught in rotating parts or blades, resulting in accident or injury.
5 . Do not leave the machine while it is still rotating.
- Others may be injured.
-This product can expose you to chemicals lead and lead compounds, which are known to the State of California to
cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
WARNING - Proposition 65 -

3
PRECAUTIONS WHEN USING 8991
Using the pipe cutter
WARNING
6. If you accidentally drop or hit the machine, carefully check for damage, cracks,
deformities or any abnormalities.
- If any abnormalities are found, ask your distributor or WHEELER-REX for an inspection and/or repair.
- Continuing to use the machine when damaged will likely lead to mechanical problems, accident or injury.
7. Do not touch the dies or scrap just after threading.
- The dies and scrap can become very hot just after threading; touching them could burn or injure you.
8 . Die head and dies.
- Use the die head and dies that are appropriate for the type and diameter of pipe to be processed.
- When threading stainless steel pipes, use pipes with a wall thickness equivalent to Schedule 40 or more.
- Make sure the die head is mounted correctly on the carriage. Be careful not to get your ngers caught.
- Before you start threading, set the die head in the threading position, switch ON, and check that the oil is flowing
correctly over the dies. Failing to do so could result in an imperfect thread, damage to the machine, accident or injury.
9. Be sure to check the starting position before threading.
- When threading, start with the carriage to the right of the red line on the front support bar (as viewed from the
working position). If the carriage is not in the correct starting position, the die head will collide against the main
unit while threading, causing mechanical problems, accident or injury.
10 . Use the pipe support when threading long pipes.
- When threading long pipes, use a pipe support to prevent both vibration due to warping while the pipe is rotating,
and instability of the machine due to the weight of the workpiece. If a pipe support is not used, threading cannot be
performed correctly and problems with the machine, accident or injury may occur.
11. Be sure to attach accessories according to the operation manual.
- Attaching accessories incorrectly may cause the machine to topple over resulting in accident or injury.
12 . Precautions when using the machine with an oil tray.
- If you are going to work with the machine placed in an oil tray, be sure to put the machine on a table and make sure
it is not immersed in oil, otherwise the oil might be sucked in resulting in damage to the motor.
CAUTION
1.When cutting pipes, turn the cutter handle no faster than ½ a rotation for each
rotation of the pipe.
- If the cutter handle is turned too quickly when engaging the pipe, it can distort the shape of the pipe and may not
make a proper thread.
2 . Do not leave the machine unattended while it is still rotating.
- Others may be injured.
WARNING
1.Changing parts with blades, sharp edges, etc.
- To prevent accidents and injury, take special care when handling or changing any parts with sharp edges such as
dies, reamers, pipe cutters and carbide cutters.
- Be sure to attach accessories according to the operation manual. Make sure you use only genuine WHEELER-REX
accessories. Using any other type can lead to accident and injury, as well as damaging the machine itself.
- Avoid attaching accessories incorrectly as doing so may cause the machine to topple over, resulting in accident or injury.
2 . Use a pipe support when threading long pipes.
- When threading long pipes, use a pipe support to prevent both vibration due to warping while the pipe is rotating
and instability of the machine due to the weight of the workpiece. If a pipe support is not used, threading cannot be
performed correctly; as a result, problems with the machine, accidents or injuries may occur.
3 . Do not put your hands or face near rotating parts when the machine is in use.
- You could get caught in rotating parts or hit by scrap, resulting in accident or injury.
4 . Do not wear gloves when operating the machine.
- Gloves may get caught in rotating parts or blades etc., resulting in a serious accident or injury.

4
PRECAUTIONS WHEN USING 8991
Reaming
WARNING
Reamer blades are very sharp; to prevent injury, avoid touching them with bare hands.
Handling thread cutting oil
CAUTION
1.Wear goggles.
- Touching the eyes with oil may cause inammation.
- Emergency treatment: Wash eyes with clean water for about 15 minutes and seek medical attention.
2 .Wear protective gloves.
- If oil comes into contact with the skin, it may cause inammation.
- Emergency treatment: Carefully wash the affected part with soap and water.
3 .Take care not to breathe in oil mist or steam.
- Breathing in oil mist or steam may cause nausea.
- Emergency treatment: Carry the person out into the fresh air, cover them with a blanket, keep them warm and
relaxed, and seek medical attention.
4 . Do not thin the oil or mix it with threading oil produced by other companies.
5 . If water gets mixed in with the threading oil and the colour changes to a milky white or
the oil deteriorates excessively resulting in a poor nish, change to fresh oil promptly.
6 . Do not drink the oil.
- Drinking the oil may cause diarrhea or vomiting.
- Emergency treatment: Seek medical attention immediately, without forcing the person to vomit.
7. Do not place the oil where it can easily be reached by small children.
8 . Be very careful of re.
9 . Storage.
- Always close the lid after use to prevent the oil from being contaminated by dust, water or other foreign bodies.
- Store in a dark place away from direct sunlight.
10 . Drums (200L).
- To prevent them from bursting, do not apply pressure to empty drums.
- Do not weld, heat, drill or cut the drums or they may burst into re from the residue they contain.
WARNING
1. Do not burn off the oil.
- Oil contains chlorine compounds and generates toxic gas when burnt. In the case of an emergency in which
someone has inhaled such toxic gases, carry the affected person out into the fresh air and seek medical attention.
2 . Handling waste oil and waste cans.
- Handle materials according to local laws and regulations regarding waste disposal and cleaning.
- If uncertain, consult your distributor or WHEELER-REX.
Pipe
CAUTION
1. Do not use highly deformed or damaged pipes as doing so may lead to poor, if not
unusable, threads.
2 .When threading stainless steel pipes use pipes with a wall thickness equivalent to
Schedule 40 or more.

5
MAIN PARTS
Table 1
Fig. 1
Table 2
STANDARD SPECIFICATIONS
STANDARD ACCESSORIES
APPLICATIONS
Cutting, reaming, threading steel and stainless steel pipes.
Model No. 8991
Threading capacity ½ B (15A) - 1 B (25A)
Voltage 120 V (50/60 Hz)
Motor single phase Input 400 W / Output 400 W, series motor (with brake)
Rotation speed 55 r.p.m (unloaded)
Net weight 58 lbs (26.1kg)
Dimensions 18" x 12.5" x 14" / 450(L) x 320(W) x 350(H) mm
MAIN PARTS, STANDARD SPECIFICATIONS, ACCESSORIES,
OPTIONS AND THEIR APPLICATIONS
Model No. 8991
Die head Auto ½ - 1” NPT
Dies ( ½ - ¾” ) ( 1 ” ) One set each
Hexagonal keys 3 mm, 5 mm 1 each
Base
Hammer chuck
Handle Cutter
Cutter handle
Drain plug
Carriage
Handle lock pin
Rear chuck
Reamer
Carriage handle Motor inside
Switch

A
B
6
Fig. 3
Fig. 2
Fig. 4
Fig. 5
Genuine WHEELER-REX
thread cutting oil
For Steel pipe
60603 2 Quart ThreadMaster Oil
60601 1 Gallon ThreadMaster Oil
60602 5 Gallon ThreadMaster Oil
For Stainless Steel pipe
60607 1 Gallon ThreadMaster Oil for SS
60608 5 Gallon ThreadMaster Oil for SS
1. Transportation (Fig. 2)
When moving or transporting the machine, remove the oil pan.
There is no need to drain off the cutting oil in the tank.
(1) Secure the cut end of a pipe rmly with the chuck, x the pipe in
position with the cutter, and move the machine.
(2) By raising the handle, the lock pin falls into the position, and the
handle is secured.
* When lowering the handle, lift the lock pin at the same time.
CAUTION
- When transporting the machine, please check and conrm that
the handle is secured properly.
- Always position the handle as shown in Fig. 2 when cutting
threads or performing other similar work.
2. Setting up (Fig. 3)
Place the machine on a at surface.
(Even when placed on a at surface, the rear chuck of the machine
is designed to be in a slightly raised position).
CAUTION
If the rear chuck is too low, oil will ow out of the pipe, making the
oor dirty and wasting oil.
3. Cutting oil (Fig. 4)
Fill the tank with the cutting oil that is supplied with the machine.
Use only genuine WHEELER-REX cutting oil. (Fig. 4)
Using this oil for threading pipes made of other materials may
result in irregular threads.
4. Attaching and removing the die head (Fig. 5)
Removing the die head
(1) Loosen the lock screw on the carriage.
(2) Raise the die head slightly in the direction of arrow A and then pull
it in the direction of arrow B.Raise the cutter if it gets in the way.
Attaching the Die head
(1) Attach the die head that matches the size of pipe to be threaded.
(Fig. 5)
(2) Align the die head post with the carriage tting hole, and push
it until it contacts the carriage while moving the die head up and
down a little.
(3) Lower the die head and check it is positioned correctly.
GETTING READY / OPERATION GUIDE
Handle
Rear chuck
too low
×OK OK
Flat
1 to 2 cm
higher at rear
chuck end
Position
when moved
Working position
Handle lock pin
Die head
post
Lock screw

7
Fig. 6
Fig. 7
Fig. 8
5. Self-opening Die Head Note
15A: 󰾙"
20A: ¾"
25A: 1"
GETTING READY / OPERATION GUIDE
How to adjust the thread cutting size
The standard die head is suitable for three pipe sizes: 15A, 20A, 25A.
For 15A and 20A pipes, put dies notch A (black) on the respective
die head over the eccentric position pin (black).
For 25A, put dies notch B (silver) on the 25A die head over the
eccentric position pin (silver). (You will need to change dies.)
Replacing the dies
Since 15A, 20A and 25A each have different thread pitches, the
dies need to be changed accordingly.
When replacing the dies, please follow the instructions below.
(1) After opening the die head (i.e. with the open lever removed
from the groove on the block and the dies in the open position)
remove the size setting lever from the size setting pin.
(2) Turn the cam plate handle in the direction of the arrow: dies
No.3 and No.4 can then be removed.
(3) Raise the die head and remove dies No.1 and No.2.
Main Parts
Dies notch A
(for 15A - 20A) Black
Dies notch A (for 15A - 20A)
(Black)
Dies notch B
(for 25A) Silver
Dies notch B (for 25A)
(Silver)
Cam plate
handle
Cam plate handle
15A (Black) 20A (Black) 25A (Silver)
Die head position pins
Lever
Dies 4
Dies 1
Dies 3
Dies 2

8
Fig. 9
Fig. 11
Fig. 12
Attaching the Dies
Fig. 10-1 Fig. 10-2
GETTING READY / OPERATION GUIDE
Attaching the Dies
(1) Use the removal procedure in reverse to insert the dies in the die head.
(2) Insert the dies in their corresponding die slot on the die head
and push them in until they click into place.
(3) Raise the die head and insert replacement dies No.1 and No.2
until the notch is engaged.
* Ensure that the number on the dies corresponds to the number
on the die head; if dies are inserted incorrectly, cuttingwill be
impaired.
(4) Turn the guide set knob in the direction of arrow 2, as shown in
Fig.9; the dies will move towards the centre of die head. If the
dies do not slip into position smoothly, try to move them up and
down a little, repeating this procedure as necessary.
* Dies are made as a matched set of four, so be sure to use them
as such and replace them all at the same time. Do not attempt
to replace just one or two dies in the set, as cutting will be
adversely affected.
Adjusting the length of the thread
(1) Press auto open lever A, put the dies in the open position, and
loosen the socket head cap screw a little.
(2) Adjust the auto open lever according to the length of the thread
to be cut, i.e. towards the reamer for long threads and towards
the cutter for short threads.
(3) Tighten the socket head cap screw securely again.
Microne Adjustment of Thread Thickness
Microfine adjustment of thread thickness allows pipes to be cut
exactly to your requirements.
(1) Slightly loosen the lock bolt on the eccentric pin.
(2) Simply turn the microfine adjustment knob to the left to
decrease, and to the right to increase thread thickness.
(3) The knob is locked by a locking bolt which should be loosened
with the hexagonal key provided and the knob turned three
settings to the right before adjustments are made.
* Size should always be checked with a thread gauge after
adjustment.
Adjustment of Thread Depth
If, even with full adjustment, thread size is not satisfactory, remove
the retaining pin and reinsert the size adjustment plates. Hold in
place with the retaining pin.
(1) Raise the auto open lever (Fig.10-1), and, with the die head open,
loosen the retaining pin with a athead (minus) screwdriver.
(2) Hold on to the size setting plate and remove the retaining pin.
(3) Be careful not to let the notch pin and the spring come out of
the size setting lever.
* If the notch pin and spring in the size setting lever come out,
place them back again in the hole in the opening block.
(4) Select and insert the size adjustment plate as shown in Figs.
12 -1 and 12- 2.
(5) Lock in position by pressing down on the notch pin and spring
with the size setting lever.
(6) Pass the axis of the notch through the rounding block and set
the size setting lever, size adjustment plate.
(7) Finally, tighten the retaining pin securely with a athead (minus)
screwdriver.
Cam plate handle
Auto open lever A
Locking bolt
Size
adjustment
plate
Short Long
Loosen
Socket head cap screw
Auto open lever
2
1
1.
For thicker threads
2.
For thinner threads
Retaining
pin

Lever nut
Loosen
Eccentric handle
Position for removing
/ replacing dies
Knock to
the right
Knock to
the right
Pull down
Dies size
- Position when cutting
threads
- Position when matching
the dimensions for
cutting threads.
Lever nut
Eccentric handle
Loosen
9
Fig. 15
GETTING READY / OPERATION GUIDE
Fig. 13
Fig. 14
Removing the dies
Replacing the dies
6. Manual-open die head (There is no need to remove the die head from the machine).
Removing the dies
(1) Knock the eccentric handle to the right, loosen the lever nut and
push the eccentric handle over to the far left. (Fig. 13) In this
position, dies No. 3 and No. 4 can then be removed.
(2) Raise the die head and you can remove dies No. 1 and No. 2.
Replacing the dies
(1) Remove the die head.
(2) Lower the die head and replace dies No.3 and No.4 in the same
way. Insert each die until the notch is engaged. (Fig.14)
(3) Raise the die head and insert replacement dies No.1 and No.2
until the notch is engaged.
* Ensure that the number on the dies corresponds to the number
on the die head; if dies are inserted incorrectly, cutting will be
impaired.
* Dies are made as a matched set of four, so be sure to use them
as such and replace them all at the same time. Do not attempt
to replace just one or two of the set as cutting will be adversely
affected.
(4) Pull the eccentric handle back in the opposite direction, left of
the arrow. The dies will move towards the centre of die head.
* If the eccentric handle does not move into position properly,
move the dies up and down a little while pushing and pulling the
eccentric handle gently and try again.
(5) Adjust according to your desired thread cutting size (see
‘Threading’).
Ensure the handle is lowered when the machine is in use. (Pg. 6, Fig. 2)
7. Setting up the pipe / Removing the pipe
WARNING
- Do not install or remove a pipe when the machine is still switched
on, when operating the machine, or just after you switch it off. If you
do, you may get entangled in moving parts, leading to accident or
injury. Restart work after you make sure the machine has come to
a complete standstill.
- When installing or removing the pipe, remove the plug from the
power outlet or the machine could suddenly start up leading to
injury or accident.
(1) Open the hammer chuck and rear chuck wider than the size of
the pipe to be threaded, inserting the pipe from the rear chuck
side where possible. (Fig. 16) (Note: In the case of short pipes,
insert from the chuck side).
(2) Close the rear chuck and, holding the pipe in your right hand,
close the hammer chuck with your left hand to place a grip
lightly on the pipe and make sure the chuck jaw inserts engage
the pipe properly. Pull the hand-wheel sharply towards you to
lock.
(3) A sharp jerk in the opposite direction will release the pipe
once you have nished threading. Next, remove the pipe after
releasing the rear chuck.
DOWN
Scroll
Hand wheel
Hammer chuck
Pipe
Handle
DOWN
STOP

60mm or more
10
Fig. 16
Fig. 18
Fig. 17
Fig. 19
GETTING READY / OPERATION GUIDE
Plug
Pins
Earth
Power supply
Connect to a power supply of
AC110 – 120V, 20A or more.
Suggestions for short pipes
- Lightly grip the pipe with the chuck, gently engage the dies with
the end of the pipe to be threaded, and then tighten the hammer
chuck again. (Fig. 16)
Note: Chuck the pipe with the pipe protruding at least 60mm from
the edge of the chuck jaw insert. (Fig. 16)
Suggestions for long pipes (Fig. 18)
- When threading long pipes, use a pipe support to avoid excessive
vibration etc. while the pipe is rotating, and to prevent the machine
from becoming unstable under the weight of the workpiece.
(Fig. 18)
Use WHEELER-REX pipe support
Keeps long pipes stable
WARNING
Not using a pipe support may result in irregular threads, damage
to the machine and/or accident or injury.
8. Power supply (Fig. 19)
Before using the unit, check the voltage on the nameplate.
Use only an AC power supply. If an extension cord is used, it must
be as short as possible and of sufficient capacity for the power
supplied (use at least a 2 mm2 exible cable, 20A for 110-120 V.
(Fig. 19)
WARNING
- Before connecting the plug to the socket, check that the switch
is turned OFF to prevent abrupt movements that could lead to
accident or injury.
- When you use a 110 – 120 V power supply, ensure it is earthed
or you may get an electric shock. If the power socket is already
earthed, rst remove the adapter provided with the earth.
Chuck
Short
pipe Dies
Pipe support
Cutting
edge
Long pipe
OK

ON
11
OFF
Fig. 21-1
Fig. 22
GETTING READY / OPERATION GUIDE
Problem Remedy
The carbon brushes are worn out. Replace with new ones according to the procedures on
Pg. 17, Fig. 40.
When the motor becomes overheated from continuous use Wait for the motor to cool down and start again.
When an oxide  lm is generated in the motor Allow the motor to rotate for about 10 minutes with no load.
Table 3
Fig. 21-2
Motor with built-in braking system
WARNING
Carry out the following checks before starting to cut or thread pipes.
Should any problems arise, refer to "Troubleshooting" at the end of this manual and follow the appropriate instructions.
Continuing to use the machine when a problem has arisen can lead to accident or injury.
9. Checks before starting
(1) Turn on the machine to set the main shaft in motion. (Fig. 20)
- Check there are no abnormal sounds or odours coming from the motor.
- Check the pipe you installed does not vibrate abnormally. If it
does, install it again.
(2) Check that cutting oil  ows as it should from the die head. (Fig. 21-1)
Con rm that there is at least 1 liter of cutting oil in the tank. (tank
capacity:1.5 L)
When the volume of oil emitted from the die head is reduced, check
that the amount of cutting oil in the tank is at least suf cient to cover
and hide the strainer. (Fig. 21-2) Replenish the oil as required.
* If the volume of oil  owing from the die head remains low even
after the oil has been added, please contact your distributor or
WHEELER-REX.
(3) Allow the machine to rotate without any load for several minutes.
- Check the motor does not become abnormally hot, etc.
(4) Turn the machine off and allow it to stop rotating.
- Check there are no abnormal sounds or odours coming from
the motor. The unit uses a motor equipped with a built-in braking
system for improved safety. Make sure you read and understand
the points below relating to the use and performance of the system.
10. Motor with braking system (Fig. 22)
The braking system in the motor is designed to minimise idling
after turning the machine off, and to prevent unexpected accidents
and injuries. The motor can stop within fewer rotations than
conventional ones. However, under certain conditions the braking
system may not engage correctly or it may become ineffective.
Read the following cautions carefully to ensure correct use.
Please note that the effectiveness of the brake will be diminished in the following cases.
If the brake does not work even under such circumstances, contact your distributor or WHEELER-REX.
WARNING
1. Make sure the braking system is working before using the machine.
- Although this machine is equipped with both a braking system
and a safety switch, the brake may not work or it may become
ineffective depending on conditions. Check the effectiveness
of the brake before use, and wait till the motor comes to a
complete stop before moving on to the next operation.
2. Be sure to use REX carbon brushes.
- Using other brushes may damage the motor or the machine itself,
or the brake may not be applied.
3. Do not use the machine in rain, humid or damp places, or places
where moisture can easily get into the machine.
- If stored for long periods in a humid place, an oxide  lm may form
on the motor, and the brake may not be engaged. Store in a place
with low humidity.
brake is effective
as OFF position
Oil
Strainer
Checking the amount of thread cutting oil /Oil tank
Con rming the amount of thread cutting oil
/ Die head
Appropriate amount of oil
flows smoothly without
interruption
Small volumes of oil
containing air bubbles
produced intermittently
come out
Fig. 20
Switch

Fig. 24
12
Fig. 23
GETTING READY / OPERATION GUIDE
When cutting a stainless steel pipe, use a stainless
steel pipe cutter wheel (product code: 135071).
A
B
C
11. Cutting pipes
(1) Raise the die head and reamer.
(2) Position the pipe so that it is ready for cutting, and fasten the pipe
securely with the hammer chuck.
(3) Open the pipe cutter wider than the diameter of the pipe, lower
it into position and turn the cutter handle, bringing the cutter
close to the position where the blade and roller lightly press
against the pipe.
(4) Switch the machine on and turn the cutter handle up to ½ a turn
for each rotation of the pipe. (Fig. 23)
* Note: When starting to cut a pipe, apply gradual pressure while
tightening the wheel lightly against the pipe. If too much force is
applied, the shape of the pipe may easily be distorted, resulting in
imperfect threads.
* Note: If the cutter handle is turned too quickly, it will affect the shape
and nish of the thread.
CAUTION
Be sure to position the cutter correctly before the pipe starts rotating.
If it is not in the correct position it could damage the pipe or the machine.
WARNING
1. Use a pipe support when threading long pipes.
- If the pipe to be cut is very long, ensure you create a stable
situation before starting. Use a proper pipe support so that the
cutter will not be overloaded by the heavy weight of the long
pipe just before or during the cutting process while the pipe is
rotating. This will prevent the machine from becoming unstable
under the weight of the workpiece. If a pipe support is not used,
threading cannot be performed correctly, causing problems with
the machine, and may even result in accident or injury.
2. Pipe cutter may break.
- Be sure to wear safety glasses, and keep your hands and face
away from the pipe cutter. Fragments may scatter, causing
accidents and injuries.
3. Always use genuine REX parts for the cutter.
- If you use anything other than genuine parts, the machine will
malfunction, resulting in accident or injury etc.
Special precautions when you cut a pipe using another pipe
cutter (Fig. 24)
We strongly recommend that only the pipe cutter attached to the
machine be used to cut pipes. If another cutter is used, ensure that
the pipe end is at right angles to the axis of the pipe. (Fig. 24-A)
If the pipe is not square on, as in Fig. 24-B and C, threads may be
defective. Illustrations B and C may be the result of the following:
Fig. 24-B
- The bearing or chucking of the cutter is unstable.
- When a grinder is used with excessive force (especially in the
case of large diameter pipes.)
- When the pipe is engaged at an angle when cutting.
Fig. 24-C
- When you have cut a large diameter pipe 2 or 3 times with a small grinder.
CAUTION
If the end of the pipe is slanted (Fig. 24-B) or has steps in it (Fig. 24-C),
it is not only impossible to make a perfect thread, but may even result
in damage to the machine, accident or injury, etc..
Cutter handle

13
GETTING READY / OPERATION GUIDE
Fig. 26
Fig. 25
Fig. 27
Fig. 28
Rod
Switch
Carriage
Pipe wrench
Fitting
Red line
12. Reaming
After cutting the pipe with the pipe cutter, be sure to use the
reamer to chamfer the inside of the pipe before making a thread.
(1) Lift the die head and pipe cutter out of the way.
(2) Lift up the set knob on the reamer and put the reamer in the
chamfering position. (Fig. 25)
(3) Turn the machine on to start the pipe rotating. Then turn the
carriage handle to the right to move the reamer forward to
engage the pipe. Allow the pipe to rotate at least ½ a turn, and
then remove the reamer from the pipe. That completes the
reaming process. (Fig. 26)
CAUTION
- Do not use excessive force when pressing the reamer against the
pipe as this may scratch the pipe or even damage the machine.
- The reamer blades are extremely sharp. NEVER touch them with
your bare hands, as you could be seriously injured.
Before threading a pipe
13. Carriage collision prevention mechanism (Fig. 27)
When threading a very short pipe, the carriage may hit the chuck
and cause serious deformation or damage to the machine. The
"collision prevention mechanism" is designed to stop the motor
automatically when it is on the verge of colliding and prevent
damage to the machine.
(1) When the carriage approaches the chuck, the rod also
approaches the switch and is pushed forward.
(2) As the carriage moves forwards, the rod pushes onto the main
switch just before a collision occurs and the machine stops.
(3) Since the pipe is far too short, make sure you extend its length
in order for the process to be carried out properly.
(Refer to Pg. 10 "Suggestions for short pipes".)
CAUTION
Start the thread cutting process with the carriage to the right of the
red line on the front support bar. (Fig. 28)
14. Improper use of a pipe wrench (Fig. 28)
As shown in Fig. 28, a pipe is positioned in the machine and a
wrench is being used to tighten the tting: never do this as there is
high risk of damaging the machine.

14
GETTING READY / OPERATION GUIDE
Cutting edge Dies
Pipe
Fig. 29
Fig. 32
15. Cutting threads (Self-opening Die Head)
Raise the cutter and reamer, and align the die head with the proper
position. Look around the work site to make sure it is safe to begin
operating the machine.
* Make sure the handle is in the lowered position (as shown on Pg.
6, Fig. 2) before you start cutting threads.
Match the correct die head and dies to the diameter of the pipe.
Similarly, make sure you use the right dies and oil for stainless
steel pipe.
(1) Push the guide set knob forward and align the die head with its
proper position. Check to make sure that the unit is set to the
desired size (Fig. 29).
To change size: (Fig.30)
1. Push the positioning notch in the direction of arrow 1 in Fig. 30.
2. Align the positioning notch with the desired pipe size as
displayed on the size indicator plate.(arrow 2)
3. Finally, push the positioning notch in the direction of arrow 3
and, at the same time, insert the positioning pin in the notch
groove.
(2) Push the guide set knob in the direction of arrow 4 until it stops.
The die head is now set in position. Switch on the machine and
the thread cutting oil will automatically ow out of the die head.
(3) Turn the carriage handle to the right to advance the die head
against the pipe and allow the dies to begin cutting (Fig. 31)
(4) Once three or four threads have been cut, the remainder will
be cut automatically. When the prescribed thread length is
reached, the dies will be released by the auto-open lever.
(5) Turn the carriage handle to the left to release the die head from
the pipe.
WARNING
When threading is completed, the self-opening die heads suddenly
open. There is a possibility of oil splashing out or metal akes ying
out, which might result in accident or injury. Avoid placing your
hands or face too close to the machine.
Precautions when threading
- Care when the dies come into contact with the pipe (Fig. 32)
Engage the cutting edge of the dies very lightly with the end of
the pipe. Bringing the dies too forcefully into contact with the pipe
will result in damage to the dies and shorten their working life.
Once the dies come into contact with the pipe, initially apply light
pressure to the carriage handle in a clockwise direction and then
gradually increase the amount of force to cut rmly. As the dies
cut into the pipe, it is no longer necessary to apply pressure to the
carriage handle as the carriage will move on its own.
Fig. 30
Fig. 31
Guide set knob
Guide set knob Positioning notch
Size indicator plate
carriage handle
3 Release
2
4
1 Down
Push up

Fig. 34
Lever nut
Eccentric link
Eccentric
handle
Mark on eccentric
link
Die head size plate
Tighten
Loosen
15
Lever nut
Eccentric link
Loosen
Loosen
Mark on eccentric link
Eccentric
handle
Die head size plate
Tighten
Tighten
Larger Smaller
GETTING READY / OPERATION GUIDE
Fig. 33
Fig. 35
Fig. 36-1 Fig. 36-2
Play
Slowly
Carriage handle
16. Cutting threads (Manual-open Die Head)
(1) To match the size of the thread, align the scale on the eccentric
link with the thread size on the size scale of the die head, and
then tighten and x the lever nut in position (Fig. 33).
(2) Turn the machine on and oil will automatically ow from the die
head.
(3) Turn the carriage handle to the right to engage the pipe with the
dies. Cut 3 or 4 threads and threading will then be performed
automatically. (Fig.34)
(4) When the thread has been cut to the prescribed dimensions,
slowly raise the eccentric handle in the direction of the arrow
and release the dies to complete the threading process.
(Note: If you release the dies too abruptly, it may result in an
imperfect nish such as a step-edged thread). (Fig. 35)
(5) Finally, complete the process by releasing the die head from the
pipe by turning the carriage handle to the left. If you place the
die head in the raised position, the ow of oil will stop. (Fig. 35)
Points to watch when threading
(1) Before adjusting the size of the thread to be
cut, bring the eccentric handle towards you,
until it is in the position indicated. (Fig. 36-1)
(2) Lightly tighten the lever nut securely by
hand. No hammering is required etc.
(3) Thread size can be simply adjusted with the
lever nut. Move it towards you to increase,
and away from you to decrease the thread
size. (Fig. 36-2)

16
Fig. 38
GETTING READY / OPERATION GUIDE
Example of thread gauge
Fig. 37
Correct thread
Thread circumference
is polygonal
Narrow thread Wide thread
Thread gauge
Pipe
core
Thread
core
Complete taper
thread
Angled
point
Distorted threads Uneven thickness
Parallel
thread
Width of the dies
Irregular shaped threads Too small
Gap
Chipped thread
4
5
6
1
2
3
Internal thread
External thread
17. Measuring threads with a gauge
Unacceptable threads (Fig. 37)
When connecting the male thread on a cut pipe to the
female thread in the joint, various factors that could lead
to leakage should be considered. The following examples
may be due to the male thread on the pipe end.
(1) Irregular shaped threads (Fig. 37 - 1)
How to distinguish irregular shaped threads
(A) Visually inspect the thread after wiping off any oil or
dirt with a rag; look for any wave-like formation.
(B) Gently check the surface of the thread with your
ngers, feeling for any irregularity.
(C) Check if bits of scrap have been produced when
cutting.
(2) Check if the diameter of the thread is too small or
too large (Fig. 37 - 2)
Check with a thread gauge.
(3) Distorted threads (in the case of manual die heads)
(Fig. 37 - 3)
When cutting threads that are wider than the width
of the dies, you can gradually open up the eccentric
handle; but then if you leave the eccentric handle in the
same position and cut a thread longer than the width of
the dies, the taper will remain the same width as the die
and the rest of the thread will be straight.
(4) Threads are too small (Fig. 37 - 4)
(5) The thread is chipped (Fig. 37 - 5)
(6) Thread with uneven thickness (Fig. 37 - 6)
* Choose an appropriate method for checking the threads
on joints and other connections, such as using sealants,
washing the joint, checking the torque etc.
CAUTION
Threads may be affected by the sharpness of the dies,
cutting oil etc., so be sure to use a thread gauge (Fig. 38) to
check the thread.
* This is especially important after you have changed the
die set

17
DAILY INSPECTION, MAINTENANCE
Fig. 39
Fig. 40
Fig. 41 Fig.42
Motor
Replacing carbon brush A (Fig. 41)
- Remove the side cover from the side of the unit and,
using a athead screwdriver, remove the carbon brush
cap attached to the motor inside. Then replace the
carbon brush.
Replacing carbon brush B (Fig. 42)
- Remove the bottom cover and, using a athead (minus)
screwdriver, remove the carbon brush cap attached to
the motor. Then replace the carbon brush.
Replacing the carbon brushes
WARNING
- Before inspecting or performing maintenance on the unit, always set the switch to the OFF position and remove the
plug from the power outlet. If the unit is left plugged in, it may begin operating unexpectedly, resulting in injury.
- If you discover any problems during inspection or maintenance, check the symptoms in "Troubleshooting" and take
the appropriate action as noted in the table. Continued use of the unit without correcting the problem may result in
overheating, smoke or re and lead to accident or injury.
1. Oiling the pipe cutter (Fig. 39)
Before you operate the machine, be sure to maintain adequate
lubrication by applying spindle oil or machine oil to the thread on
the cutter handle, roller shafts and blades once a day.
2. Replacing the carbon brushes (Fig. 40)
- To protect the motor, the unit is equipped with two auto-stop
carbon brushes. When these brushes get too worn, the motor will
not operate even when the unit is turned on.
- Be sure to use REX original carbon brushes. Using other brushes
may damage the motor.
CAUTION
- Always replace both carbon brushes as a set.
- Be sure to use REX original carbon brushes.
- Using other types of carbon brushes may damage the motor or
the machine, or cause accidents.
- When replacing the carbon brushes, always make sure the unit
is stable. Trying to replace the brushes with the unit tilted is
extremely dangerous, as the unit may fall over.
Oil Oil
Pipe cutter
Carbon brush A
Side cover
Motor
Bottom cover
Carbon brush B
Carbon brush
cap
Carbon brush
cap
Carbon brush
Carbon brush
Side cover