Wheeler-Rex 8190 User manual

Date of purchase: Year Month
Distributor / Dealer:
Be sure to read this
Operation Manual before
using the machine.
- Note -
- Be sure to hand this Operation Manual to the user.
- To ensure safe and efficient use, read the manual thoroughly
before using the machine.
- Be sure to keep the Operation Manual where the operator
can refer to it whenever necessary.
取扱説明書
8190
PIPE THREADING MACHINE
OPERATION MANUAL

Date of purchase: Year Month
Distributor / Dealer:

Definitions of and
In this Operation Manual, warnings are divided into and .
: indicates actions which could possibily result in death or severe injury to the user if
the machine is used incorrectly.
: indicates actions which could possibly result in injury to the user, or physical damage,
if the machine is used incorrectly.
Even items labelled 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, dealer or link
to https://www.wheelerrex.com
- 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 the Operation
Manual may be different to the product you have purchased.
！WARNING ！CAUTION
！WARNING ！CAUTION
！CAUTION
！WARNING
！CAUTION
CONTENTS
Safety Considerations .............................................................................................................. . 1
Precautions
................................................................................................................................... 3
Main Parts, Specifications, Standard Accessories, Usage
..................................... . 5
Getting
Ready
1.Transportation
.................................................................................................................. . 6
2. Machine set up
............................................................................................................... 6
3. Threading oil
................................................................................................................... 6
4. Attaching the Die-head
............................................................................................. 6
5. Operating the Die-head
................................................................................................ 7
6. Setting up the pipe / Removing the pipe
............................................................ 8
7. Power supply
................................................................................................................ 9
8. Checks before starting
............................................ . ........................................... . 9
9. Cutting pipes / Precautions when threading
............................................... . 10
10. Reaming / Points to watch when threading
................................................. . 11
Operation Guide
1
1. Making threads (NV-auto Die-head) ................................................................. . 12
12. Making threads (Universal Die-head)
................................................................. 13
13. Adjusting the oil flow
................................................................................................ . 13
14. Measuring threads with a gauge
......................................................................... 14
Optional Accessories
............................................................................................................... 15
Maintenance and Care
1. Grease, Oil
...................................................................................................................... 15
2. Replacing the Carbon brushes
............................................................................ . 15
3. Cleaning the Oil tank
................................................................................................ 16
4. Replacing / Installing the Chuck jaw set
......................................................... . 16
5. Wiring diagram
............................................................................................................ 16
Servicing and Repairs
............................................................................................................ 17
Troubleshooting
......................................................................................................................... 17
Explanation of Symbols
.........................................................................................................1 8
Thank you for purchasing a WHEELER REX Pipe threading machine.
Precision-engineered for cutting, reaming, threading and, with our optional Portable Groovers, grooving steel
and stainless steel (option) pipes, our product will give you years of reliable service if you simply follow the
instructions in this Operation Manual carefully.
Before using the machine, therefore, make sure you read the Operation Manual from start to finish, paying
particular attention to the Safety Considerations on pages 1 & 2 and Precautions on pages 3 & 4. To avoid
accident and injury, never use the machine for any purposes other than those described in this Operation Manual.
Should you need further advice, contact your distributor, dealer or WHEELER REX.

WARNING
11. Use the machine only for its designated purpose.
10. Do not use the machine with excessive force.
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.
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 FWD or REV, the machine may start operating
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 moisture 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 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 and thinner. Fire or explosion might occur.
5. Use designated accessories and attachments.
-Do not use accessories and attachments other than those designated in the Operation Manual or our catalogues.
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).
If the machine is plugged in, it may start operating unexpectedly, causing accidents.
7. If any abnormality is noticed, stop operation 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 in the section entitled, "Troubleshooting" at the end of the Operation
Manual and observe the corresponding instructions. If the machine is used continuously, overheating, smoke
or fire might occur, causing accident or injury.
- If overheating or smoke from the unit occurs, do not attempt an overhaul yourself but ask for an inspection
and repair.
8. Keep the work site clean.
- Ensure you keep the work table and the work site in good order and well lit.
- A cluttered site and work table are liable to cause accidents.
9. Do not let unauthorised personnel near the machine.
- Do not let anyone other than authorised personnel touch the main unit or the power cord, or operate the machine.
- Do not let anyone other than authorised personnel enter the work site, especially children. Injuries might occur.
-
To ensure safe and efficient 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 cause smoke or fire.
- Do not use the machine on pipes not specified in the Operation 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.
Safety Considerations
1

12. Wear appropriate clothing.
- Do not wear neckties, clothes with unbuttoned 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 firm footing and balance to avoid falling over and injuring yourself.
14. Remove tools such as wrenches.
- Before turning the switch ON, 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.
15. Operate the unit with great care.
- Always work with great attention to how you handle and operate the machine and to 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, affected by medicines, etc.
16. Do not handle the power cord carelessly.
- 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 and objects with sharp edges.
- Take care not to tread on the cord, pull the cord or apply unnecessary force resulting in damage to the cord.
Electric shock or short-circuit may occur, causing fire.
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 dealer 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 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 damage to the protective cover and other parts, and check both
normal operation and specified functions.
- Check for any abnormalities such as in adjustment of movable parts, tightening, damage to and installation
of parts and all parts affecting operation.
- Do not use machines with a damaged power cord or plug. Doing so may cause electric shock or a short,
circuit leading to fire.
- Do not use machines if the switches do not work properly.
In replacing or repairing a broken protective cover and other parts, follow the Operation Manual.
If no instructions are specified in the Operation Manual, ask your distributor or dealer 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.
20. For overhaul and repair of the machine, ask an appointed WHEELER REX agent.
- Our products comply with corresponding safety standards. Do not remodel.
- Be sure to ask
your distributor or dealer 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.
WARNING
WARNING - Proposition 65 -
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.
2
Safety Considerations

Threading
1. Take care when handling the blades.
 - To prevent accidents and injuries, take special care when handling blades such as Dies, Reamer, Pipe cutter
and Carbide cutter.
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 perform the next job until rotation stops completely.
  - When you turn the switch off, rotation does not stop 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.
6. If you accidentally drop or hit the machine, carefully check for damage, cracks, deformities
or any abnormalities.
- If abnormalities are found, ask your distributor or dealer 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 fingers caught.
- Before you start threading, set the Die-head in the threading position, switch ON(FWD), 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 Carrige support bar A (as viewed from
the working position).

If the Carriage is not in the correct starting position, the Die-head will bang into the main unit while threading,
causing mechanical problems, accident or injury.
-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.
  - Attaching accessories incorrectly may cause the machine to topple over resulting in accident or injury.
WARNING
Reaming
The Reamer blade is very sharp; to prevent injury, avoid touching it with bare hands.
WARNING
10. Use a pipe support when threading long pipes.
11. Be sure to attach accessories according to the Operation Manual.
3
Precautions

When cutting pipes, turn the Cutter handle no faster than ½rotation per 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.
Cutting
- Using the Pipe cutter
CAUTION
When using threading oil for water mains pipes and water-immiscible cutting fluid for
threading
When using threading oil for stainless steel pipes
Handling waste oil and waste bottles.
- Handle materials according to local laws and regulations regarding waste disposal and cleaning.
- If uncertain, consult your distributor or dealer.
CAUTION
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. Disposal of waste oil and bottles.
- Follow all laws and regulations related to the disposal and cleaning of waste materials.
When uncertain, consult your distributor or dealer.
1. Wear goggles.
 - Touching the eyes with oil may cause inflammation.
- 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 inflammation.
- 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 or
the oil deteriorates excessively resulting
in a poor finish, change to fresh oil promptly.
6. Do not drink the oil.
- Drinking the oil may cause diarrhoea or vomiting.
- Emergency treatment : Seek medical attention immediately, without forcing the person to vomit.
7. Do not place the oil where it is easily reached by small children.
8. Be especially careful of fire.
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.
Handling pipe threading oil
WARNING
WARNING
4
Precautions

Main Parts, Specifications, Standard Accessories, Usage
Main parts 8190
Fig. 1
Specifications
Standard Accessories
8190
Model
Threading capacity
Type of thread
Voltage
Motor Type
Rotation speed
Net weight (kg/lbs)
Dimension (mm/inch)
Chuck type
Model
Die-head
Dies
Threading oil
Pipe stands / Leg caps
Hexagonal keys
Thread Master
4 / 4
3, 4, 5, 6 mm
4
NV-auto
(½ - 2")
*Universal<Manual>(½ - 2") available on request
Table 1
Table 2
(½ - ¾") (1 - 2")
*Model without pipe stand and Leg cap also available
8190
One set each
Usage: The machine is designed for cutting, reaming and threading steel and stainless steel pipes only.
Do not use for any other purpose whatsoever.
½" - 2"
Standard Taper Pipe Thread
110 - 120V *220V available on request
625mm (L)X 400mm(W)X 400mm(H) / 24.6” (L)X 15.7”(W)X 15.7”(H)
48Kg / 106lbs
38 r.p.m. (unloaded)
K-type chuck,
S-type chuck jaw insert
Universal Motor, Single Phase
REAR
Rear grip
Side cover
Scrap
receiver
Oil pan
Rear chuck
scroll
Pipe stand
Leg cap
Drain plug
Carriage
Reamer
Cutter handle
Die-head
Carriage handle
Hammer chuck
Base
Rear chuck
scroll
Power
supply cord
Cam switch
Foot switch
Cabtyre cord
FRONT
5

( Transportation / Setting up / Threading oil / Attaching the Die-head) Getting Ready
1. Transportation
When moving or transporting the machine, remove the Oil pan.
There is no need to drain off the Threading oil in the Tank.(Fig. 2)
- NV-auto Die-head
Before moving the machine, chuck a piece of pipe securely and
fix the pipe with the Cutter.
- Universal Die-head
Chuck a piece of pipe securely, loosen the Lever nut on the Die
-head and open the Dies. (So that the Dies do not drop out, place
the Eccentric handle in the threading position.)
Lower the Pipe cutter, fix the pipe with the Cutter rollers and Cutter
wheel, and then move the machine.
2. Machine set up
Place the machine on a flat surface.
Even when placed on a flat surface, the Rear chuck of the machine
is designed to be in a slightly raised position. (Fig. 3)
- Mounting on Pipe stands
Using third-party Pipe stands may result in the machine falling
over. Ensure you use only genuine WHEELER REX stands.
Insert the stands into the sockets located in each corner of the
bottom of Base, and fix in position with the four bolts provided.
(Fig. 4)
Once the machine is set up, be sure to place the Oil pan in its
correct position.
If the Rear chuck is too low, oil will flow out of the pipe, making
the floor dirty and wasting oil.
4. Attaching the Die-head
Attach the Die-head that matches the size of pipe to be threaded
to the machine.
- Attach the Die-head to the machine.
- Align the Die-head post to the Carriage fitting hole, and push it
until it contacts the Carriage while moving the Die-head up and
down a little. (Fig.6-1)
- Lower the Die-head and check it is positioned correctly. (Fig.6-2)
*Note: Remove the Die-head by following the above in the reverse
order.
Fig. 2
Fig. 4
Rear
grip
You can grip here, too.
Fig. 6
Carriage
fitting hole
Die-head post
1
2
Rear chuck
too low
Flat
Fig. 3
OK OK
No problem if
1 to 2cm higher
at Rear chuck
end of machine.
WARNING
NG
Fig. 5
Thread Master Oil
1 Gallon
60601
60602
5 Gallon
3. Threading oil
Fill the Tank with the Threading oil that is supplied with the machine.
Use only genuine WHEELER REX Threading oil. (
Fig. 5 )
60601 1 Gallon Thread Master Oil
60602 5 Gallon Thread Master Oil
6

Getting Ready (Removing or replacing the
Dies)
5. Operating the Die-head
Universal Die-head (*on requested)
(There is no need to remove the Die-head from the machine.)
Removing the Dies
- Knock the Eccentric handle to the right, loosen the Lever nut and
push the Eccentric handle over to the far left. (Fig. 9)
In this position, Dies No. 3 and No. 4 can then be removed.
- Raise the Die-head and you can remove Dies No. 1 and No. 2.
Replacing the Dies
- Ensure the number on the Dies corresponds with the number of
the slot on the Die-head.
Insert each Die until the notch is engaged. (Fig. 10)
- Pull the Eccentric handle back in the opposite direction, left of
the arrow; (Fig. 9) The Dies will move towards the centre of Die
-head.
*Note: 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.
*Note: 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
threading will be adversely affected.
Loosen
Knock to the right
Lever nut
Eccentric
handle
Fig. 9
Insert Dies in
their corres-
ponding slot.
Fig. 10
4
No. 4
NV-auto Die-head
(There is no need to remove the Die-head from the machine.)
Removing the Dies
- Open the Die-head. (Fig. 7)
(i.e. Pull the Auto-open lever B as shown by the arrow marked
"Open")
- Loosen the Lever nut (Fig. 7), pull the Cam plate as far as it will
go in the direction of the arrow, and lightly tighten the Lever nut.
Dies No. 3 and No. 4 can be then removed. (Fig. 8)
- Raise the Die-head and you can remove Dies No. 1 and No. 2.
Replacing the Dies
- Match the number on the Die to the corresponding number on
the Die-head.
Insert the Die until the notch clicks into position.
- Push the Cam plate back; the Dies will move towards the centre
of the Die-head.
*Note: If the Dies do not move into position properly, move them
up and down a little and try again.
*Note: 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
threading will be adversely affected.
Insert Dies in
their corres-
ponding slot.
Fig. 7
Fig. 8
Lever nut
Loosen
Cam
plate
Open
Auto-open
lever B
No. 4
7

(Setting up the pipe / Removing the pipe) Getting Ready
6. Setting up the pipe / Removing the pipe
-Do not install or remove a pipe when the machine is moving, such as when operating the machine or just after you
Switch it off. If you do, you may get entangled, leading to accident or injury. Start operation 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

 operating leading to injury or accident.
WARNING
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. 12)
*Note: Chuck the pipe with the pipe protruding at least 90 mm from
the edge of the Chuck jaw insert. (Fig. 12)
Fig. 12
Chuck Dies
Short pipe
Cutting
edge
90mm
Chuck jaw inserts
Pipe-Support
Long pipe
Fig. 13
OK
- Open the Hammer chuck and Rear chuck scroll wider than the
size of the pipe to be threaded.
- Insert the pipe from the Hammer chuck side with a length that
cannot be reached to the Rear chuck, but longer pipes from Rear
chuck scroll side. (Fig. 11)
- Tighten the Rear chuck scroll to engage the pipe, and ensure
it is propery centred in the inserts.
- Tighten the Hammer chuck by Hand wheel to clamp the pipe,
and ensure it is centred in the inserts.
- Pull the Hand wheel sharply towards you to lock.
- A sharp jerk in the opposite direction will releasing the pipe once
you have finished threading.
- Next, remove the pipe after releasing the Rear chuck scroll.
Pipe
Hammer
chuck
Fig. 11
Loosen
(Open) Loosen
(Open)
Rear chuck scroll
Tighten Tighten
Hand wheel
Chuck jaw
NG
Suggestions for long pipes
- 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. 13)
Fig. 14
Not using a pipe support may result in irregular threads, damage
to the machine and/or accident or injury.
WARNING
Use the Model :
WH #850, 851,
Folding tripod pipe supports.
Keeps long pipes stable.
850 851
8

Getting Ready (Power supply / Checks before starting)
7. Power supply
Before using the unit, check the voltage on the Name plate.
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 (at least 2mm²Cabtyre cable rated for
outdoor use, 20A for 110-120V and 10A for 220-230V). (Fig. 15)
WARNING
- Before connecting the plug to the socket, check that the
machine switch is turned OFF to prevent abrupt movements
that could lead to accident or injury.
-
When you use a 110 - 120V power supply, ensure it is earthed
or you may get an electric shock.
If the power socket is already earthed, first remove the
supplied adapter with the earth. Fig. 15
Carry out the following checks before starting to cut or thread pipes. Should any problems arise, refer to "Trouble-
shooting" at the end of this Operation Manual and follow the appropriate instructions.
Continuing to use the machine when a problem has arisen can lead to accident or injury.
WARNING
8. Checks before starting
Turn on the machine to set the Main shaft in motion.
- 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.
- Check that Threading oil flows as it should from the Die-head.
Confirm that there is at least 2 liters of Threading oil in the tank. (tank capacity:2.8L)
Allow the machine to rotate without any load for several minutes.
- Check the motor does not become abnormally hot, etc.
Turn the machine off and allow it to stop rotating.
- Ensure that the motor stops rotating.
Connect to a power supply of
AC 220V-230V, 10A or more
Ground
Pins
Plug
Foot switch
Pedal UP (OFF)
DOWN (ON)
Fig. 17
Using the Foot switch
The foot switch has a mechanism by which pressing down on
the pedal turns the current on and releasing the pedal turns it
off and stops the machine.（Fig. 17）
- Place the foot switch in a position where it is easy to use,
close to where you are working.
- Be sure to switch Off if there is a sudden power cut. If you
leave the machine on, then once the power comes back on the
machine will suddenly start up, which could lead to accident or
injury.
WARNING
Using the Cam switch
The Off position is normally used only to turn the machine off at
the end of a work session.
If the Cam switch is placed in the FWD position, the Hammer
chuck will rotate in an anticlockwise direction (normal rotation) as
seen from the Chuck. In the REV position, it rotates in a clock
-wise direction (reverse rotation). (Fig. 16)
- Do not attempt to cut, ream or thread steel or stainless pipes
in the REV position.
- When switching from FWD (normal rotation) to REV(reverse
rotation) or, conversely, from REV to FWD, be sure to turn OFF
first before operating the machine again.
- The machine will not start rotating unless both the Foot switch
and Cam switch have been turned ON.
- Be sure to turn the Cam switch OFF whenever you leave the
machine.
WARNING
Cam switch Fig. 16
REV
(ON)
FWD
(ON)
9
Connect to a power supply of
AC 110V-120V, 20A or more
Power
*

(Cutting pipes) Getting Ready
If the end of the pipe is slanted (Fig. 19-B) or has steps in it
(Fig. 19-C), it is not only impossible to make a perfect thread,
but may even result in damage to the machine, accident or
injury.
We strongly recommend that only the 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. 19-A)
If the pipe is not square on, as in Fig. 19-B and C, threads may be
defective. B and C may be the result of the following:
(Fig. 19-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. 19-C)
- When you have cut a large diameter pipe 2 or 3 times with a small
grinder.
CAUTION
A
B
C
Fig. 19
OK
Special precautions when you cut a pipe with
another cutter
Precautions when threading
Care when the Dies come into contact with the pipe (Fig. 20)
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 engage the end of the pipe, apply light pressure
to the Carriage handle in a clockwise direction and then gradua
-lly increase the pressure.
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. 20
Dies
Pipe
Cutting edge
- Raise the Die-head and Reamer.
- Position the pipe so that it is ready for cutting and fasten the pipe
securely with the Hammer chuck.
- 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 Cutter wheel and the Cutter rollers lightly
press against the pipe.
- Turn the Cam switch to the FWD position. (Fig. 16)
-Turn the Cutter handle up to ½ a turn for each rotation of the pipe.
(Fig. 18)
*Note: If the Cutter handle is turned too quickly, it will affect the
shape and finish of the thread.
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.
Fig. 18
Cutter handle
CAUTION
Hammer
chuck
9. Cutting pipes
Cutter handle
NG
NG
10

-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 blade is extremely sharp. NEVER touch it with your bare hands, as you could be seriously injured.
CAUTION
- After cutting the pipe with the Cutter, be sure to use the Reamer
to chamfer the inside of the pipe before making a thread.
 (Figs. 21, 22)
- Lift the Die-head and Cutter out of the way.
Reamer with a shaft
- Lower the Reamer arm and set it in position on the Carriage, then
push the Reamer toward the pipe. (Fig. 21-1)
* Note: Reaming is possible without pushing the shaft when a
pipe is chucked long enough from the Chuck.
-Lock the Reamer in position by turning the Reamer shaft anti
-clockwise.(Fig. 21-2）
-Turn the Cam switch to the FWD position 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, then remove the Reamer
from the pipe.
That completes the reaming process.(Fig. 22)
10. Reaming
Fig. 21
Reamer shaft
Carriage
Lock
2.Release
1
Reamer
arm
Move
forward
Turn
right
The 8190 Series comes with the NV-auto, or Universal Die-head (½ - 2") (*on request) and 2 sets of Dies (½ - ¾")(1 - 2")
as standard accessories.
Check that the Die-head and Dies you are using are suitable for the pipe you are working on.
Points to watch when threading
- When setting the size of the thread to be made, first push down
the Open lever A until it is in the set position and then match the
mark on the Cam plate fixing pin with the mark on the Size plate
according to the pipe size scale on the Die-head.(Fig. 23)
- Tighten the Lever nut securely by hand. (Figs. 23)
- To adjust the thread size, turn the mark on the Cam plate fixing
pin closer towards you from the line on the size mark to make it
larger, and in the opposite direction to make it smaller.
NV-auto Die-head
Lever nut
Size plate
Tighten
Loosen
Set(down)
Open
(up) Open lever A
Mark on
Cam plate fixing pin
Fig. 23
- Before adjusting the size of the thread to be made, bring the
Eccentric handle towards you, until it is in the position indicated.
(Fig. 24-1)
- Tighten the Lever nut securely by hand.
- Thread size can be simply adjusted with the Lever nut.
Move it towards you to increase, and away to decrease the
thread size. (Fig. 24-2)
Lever
nut
Position of
Eccentric handle
Larger Smaller
Fig. 24-2Fig. 24-1
Eccentric link
Universal Die-head (*on request)
11
Getting Ready (Reaming
/ Points to watch when threading)
Fig. 22

- Start the threading process with the Carriage to the right of
the red line on the Carriage support bar A.
If you start making a thread with the red line on the Carriage
support bar A hidden from view, the Carriage could knock into
the base, which could lead to damage or possible injury. (Fig. 29)
- If the machine happens to stop rotating in the middle of making
a thread, turn the machine off immediately and pull out the plug.
Failure to do so could result in fire or damage to the motor.
11. Making threads (NV-auto Die-head)
To avoid accident or injury, always start the threading process
with the Carriage to the right of the red line on the Carriage
support bar A.
CAUTION
-Loosen the Lever nut on the Die-head and match the marking on
the Cam plate fixing pin with the pipe size on the Size plate; then
retighten the Lever nut. (Fig. 25)
WARNING
Fig. 27
Carriage handle
- Press down on the Open lever to put it into the 'Set' position.
(Fig. 26)
- Turn the machine on and oil will start flowing automatically from
the Die-head.
- Turn the Carriage handle to the right to engage the pipe with the
Dies.
Make 3 or 4 threads and threading will then be performed auto-
matically. (Fig. 27)
- When the prescribed length of thread has been made, the Dies
will automatically be released by the Auto-open leverB.
- Finally, release the Die-head from the pipe by turning the Carriage
handle to the left.
- When the NV-auto Die-head has finished threading, it opens
quite quickly. This may cause oil or small pieces of scrap to
shoot out, which could possibly lead to injury.
- To avoid this, keep your hands and face away from the machine
while it is working.
WARNING
Fig. 25
Lever nut
Size plate
Tighten
Loosen
Set
1. Open
Open lever
Marking on the Cam plate fixing pin
Large
Small
Fig. 26
Open lever
Open
Set
Auto-open
lever B
1. Removing the Auto-open lever B. (Fig. 28-1)
Loosen the Hex-socket cap screw (M6 x 12) and remove the
Auto-open lever B together with the Washer and the Spring washer.
* Note: Make sure you do not lose any of the parts you remove.
If you do, you will not be able to use the auto-opening
function to make threads of a regular length.
2. Resetting for regular tapered threading. (Fig. 28-2)
Adjust thread length by sliding the Auto-open lever B forward
or backward.
You can make shorter threads or any length of parallel threads etc., if you raise the Auto-open lever B at the length you want.
When threading longer parallel threads, remove it as described below.
If the Die-head does not open automatically for some reason, such as scrap preventing it from opening, you can open
the Die-head by raising the Open lever. (Pg12, Fig. 25-1)
* Note : Make sure the Die-head and Dies are appropriate for
the type of thread that you wish to make; for example,
threads for bolts etc.
hex-socket
cap screw
spring
washer
Fig. 28-2
Fig. 28-1
Auto
-open
lever B
washer
1 2
(Making threads) Getting Ready
Auto-open
lever B

Operation Guide (Making threads / Adjusting the oil flow)
When using a Manual-open Die-head (½ - 2"), check that the Die
-head and Dies you are using are suitable for the pipe you are
working on.
-To match the size of the thread, align the scale on the Eccentric
link (Fig. 24-1) with the thread size on the size scale on the Die
-head, and then tighten and fix the Lever nut in position (Fig. 29).
-Turn the machine on and oil will automatically flow from the Die
-head.
-Turn the Carriage handle clockwise to engage the pipe with the
Dies.
Make 3 or 4 threads and threading will then be performed auto-
matically. (Fig. 30)
The unit uses an universal motor whose rotation speed automati
-cally varies according to the load.
-When the thread has been made to the prescribed dimensions,
slowly raise the Eccentric handle in the direction of the arrow and
release the Dies to complete the threading process. (Fig. 31-1)
*Note: If you release the Dies too abruptly, it may result in an
imperfect finish such as a step-edged thread.
-Finally, complete the process by turning the Carriage handle
anticlockwise to release the pipe from the Die-head. (Fig. 31-2)
If you place the Die-head in the raised position, the flow of oil will
stop.
12. Making threads (Universal Die-head）
Fig. 29
Fig. 31
Eccentric handle Lever nut
Play
1. Slowly
2
Fig. 30
Carriage
handle
Red line
WARNING
- Start the threading process with the Carriage to the right of the
red line on the Carriage support bar A.
If you start making a thread with the red line on the Carriage
support bar A hidden from view, the Carriage could knock into
the base, which could lead to damage or possible injury. (Fig. 29)
- If the machine happens to stop rotating in the middle of making
a thread, turn the machine off immediately and pull out the plug.
Failure to do so could result in fire or damage to the motor. Carriage support bar A
Red line
13. Adjusting the oil flow
Fig. 32
Relief valve
CAUTION
Do not adjust the oil flow while the machine is rotating.
You can adjust the oil flow from the Die-head.
-
With the Die-head in threading mode, remove the Oil pan and check
the discharge of the oil.
-
Turn the Relief valve to adjust to the most suitable amount of oil
needed.
(Fig. 32)
- Rotating the valve clockwise decreases the oil flow; turning in the
opposite direction increases it.
Oil flow should not be adjusted while the machine is running.
*Note: Depending on the load when threading, the amount of oil
will vary according to the speed the machine rotates.
13

Choose an appropriate method for checking the threads on
joints and other connections, such as using sealants, washing
the joint, checking the torque etc.
(Measuring threads with a gauge) Operation Guide
14. Measuring threads with a gauge
Confirming the number of threads
- Confirm whether the thread length is as it should be according
to the number of threads as shown in Fig. 35.
Confirming the thread diameter (Figs. 33 - 34)
- Use a thread gauge to confirm the diameter is as it should be.
Threads may be affected by the condition of the Dies and/or the Threading oil etc., so be sure to use a Thread gauge
to check the thread. This is especially important after you have changed a set of the Dies.
Length of effective thread
Total No. of threads
11 10
9 8 7 6 5 4 3 2 1
Counting the number of threads
Thread gauge
Other pipe thread gauges
Fig. 33 Fig. 34
WARNING
Non
-effective
part
Fig.35
CAUTION
Unacceptable threads
-Irregular shaped threads (Fig. 36-1)
Recognising irregular shaped threads
a.Visually inspect the thread after wiping off any oil or dirt with
a rag; you will find a wave-like formation.
b.Gently check the surface of the thread with your fingers, feel
-ing for any irregularity.
c.Check if bits of scrap are produced when threading.
-The diameter of the thread is too small or too large (Fig. 36-2)
Check with a Thread gauge.
-Distorted threads (in the case of Universal Die-head) (Fig. 36- 3)
When making threads that are longer 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 make 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.
- Threads are too thin (Fig. 36-4)
- The thread is chipped (Fig. 36-5)
- Thread with uneven thickness (Fig. 36-6)
Correct thread
Parallel
thread
Angled point
Die width
2. Small dia. / Large dia.
Clearance
Internal thread
External thread
Complete
taper thread
Thread gauge
1. Polygonal thread
Outer circumference
of thread is come to
polygonal
4. Thin crests
5. Chipped-off crests
6. Biased wall thread
3. Inflected thread
Centre line
of pipe
Centre line
of thread
Fig. 36
14

Optional Accessories
Pipe support: Hi-support (#850, #851)
Table 3
Cutter Roller
Table 6
Roller Blade
For Steel pipes
Universal Die-head ¼ - ⅜, ½ - 1½
Table 4
HSS
HSS
BSPT
NPT
Alloy
Alloy
For Steel Pipes
¼ - ⅜, ½ - ¾, 1 - 2
¼ - ⅜, ½ - ¾, 1 - 2
¼ - ⅜, ½ - ¾, 1 - 2
¼ - ⅜, ½ - ¾, 1 - 2
Nipple attachments
- REX Nipple Attachments are designed to be used together with
our pipe threading machine to produce nipples easily. (Fig. 37 -1, 2)
- Refer to Minimum Length of Nipples (Table 7) to select the appro
-priate size.
- Refer to the Nipple Attachment Operation Manual for how to use
Nipple attachments.
Table 7
Size ½
¾ 1 1¼ 1½ 2
Fig. 37-1 Fig. 37-2
- 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, look up the symptoms in the "Troubleshooting" table
and take the appropriate action as noted in the table.
Continued use of the unit without correcting the problem may result in heat, smoke or fire and lead to accident or injury.
WARNING
Maintenance & Care
Greasing the Main shaft bearing
- Be sure to apply Grease to the Main shaft and bearings about
once a month. (Fig. 38-1)
Oiling the Cutter
- Before you operate the machine, be sure to maintain lubrication
by applying spindle oil or machine oil to the thread on the Cutter
handle, Roller shafts and the Cutter wheel once a day.
(Fig. 38-2)
1. Grease, Oil
1. Grease
2.Oil
Fig. 38
Dies
Parts for Single layer plastic coated steel pipes
Die-head
#60601
#60602
Thread Master Oil 1 Gallon
5 Gallon
Threading oil:
Table 5
- To protect the Motor,the unit is equipped with 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 WHEELER REX Carbon brushes.
Using other brushes may damage the Motor.
Replacing the Carbon brushes
Ensure the plug has been removed from the power outlet.
Always replace both brushes at the same time.
2. Replacing the Carbon brushes
15
*See Pg. 8, Fig. 14

Maintenance & Care
- Replacing the Carbon brushes at the both sides. (Fig. 39)
Remove the Side cover from the side of the Base, remove the
Carbon brush cap with a flathead screwdriver and replace the brush.
Fig. 39
Carbon brush cap
Side cover
- Be sure to use WHEELER REX Carbon brushes.
- Using other brushes may damage the Motor or the machine,
or cause accidents.
WARNING
As tiny bits of scrap accumulate in the Tank, be sure to clean it at
least once a month. (Fig.40)
*Note: There should be 2 liters of Threading oil in the Tank.
Use WHEELER REX Cutting oil only.
Cleaning the Oil t ank
- First, remove the Scrap tray, then lift up the Tank upper cover
using the Finger grip and remove it.（Fig.40）
- Remove the Strainer by using a phillips screwdriver to loosen the
Round head screw that fastens the Oil tube to the Strainer.
- Remove the Drain plug and drain off the Threading oil.
- Replace the Drain plug once all the scrap in the Tank has been
removed. Put the Strainer back before replacing the Threading oil.
As shown in Fig. 42, Chuck jaw insert set consists of 4 parts:
the Chuck jaw insert at one end of the Chuck jaw, and the
Spring retainer, Spring, and Set screw at the other.
When changing the Chuck jaw insert, turn the Hand wheel so that
the indent is directly over the Chuck jaw and remove the Set screw
inside it. (Fig. 41)
Also, if the 6 bolts that fix the Chuck in position come loose, it will
affect thread cutting, so check regularly and tighten as needed.
3. Cleaning the Oil tank
4. Replacing / Installing the Chuck jaw set
Allen key
Strainer
Oil tube Drain plug
Scrap tray
Fig. 42 Chuck jaw
Spring
Set screw Spring retainer
Chuck jaw
insert
Indent
Hand wheel
Bolt to
fix chuck
Chuck jaw
Fig. 41
Fig. 40
Tank upper cover
5. Wiring diagram
Finger
grip
16
Fig. 43
Y
Y
Y
Y
Y
Y
1615
14
13
12
11
109
87
65
43
2
1
COM NO
NC
NC
NO
White
Black
White
(Shrinkage tube)
Black
Red
Foot switch Foot switch wire
Green
Cable
Cam switch
(Main switch)
Green
Black Main
motor
115V
Red
Black
White

WARNING
- If the problem you have and the appropriate remedy are not shown in the table below, do not attempt to disassemble
or repair the unit yourself.
- If the problem and remedy are not shown in the table, or if the table indicates that you should have the unit repaired
or serviced, consult your distributor, dealer or WHEELER REX.
- If this product is repaired by someone who does not have the proper knowledge or technical skill to do so, the
product may not operate properly, or an accident or injury may occur. In the event of a problem, always check the
table before contacting your distributor, dealer or WHEELER REX.
Troubleshooting
Table 8
Machine does not
operate properly
when turned on.
Rotation of the main shaft is defective.
No oil flow.
Oil flows out of the back of the pipe.
Difficulty in attaching the Die-head.
Moving parts do not move smoothly.
Dies do not engage pipe correctly.
Threading cannot be
performed correctly.
Problem Cause Remedy
Too Large
/ Small
Too Long
/ Short
The Motor
is running.
The Motor
is not running.
Check the voltage. (Pg. 9)
Check the voltage. (Pg. 9)
Repairs are needed.
Repairs are needed.
Repairs are needed.
Repairs are needed.
Insert the plug into the power socket.
Replace with new ones according to
the procedures on Pgs. 15 - 16.
Adjust the Die-head according to the
procedures on Pgs. 12 - 13.
Remove scrap.
Replace with new ones.
Replace with new ones.
Match the Dies to the number on the
Die-head.
Replace with new ones.
Replace with new ones.
Replace with new oil.
Match the Dies to the number on the
Die-head.
Remove scrap attached to the Die-head
post and hole.
Remove the obstruction.
Replenish oil.
Remove scrap in the Oil tank.
Raise the Rear chuck.
Fit the Die-head in the correct position.
Adjust the Die-head according to the
procedures on Pgs. 12 - 13.
The plug is disconnected.
Voltage is too low.
Voltage is low.
The Gear is broken.
The Motor is burned out.
The Switch is damaged.
The Motor is burned out.
The Carbon brushes are
worn.
Moving parts blocked
by scrap.
The Dies are worn.
The Dies are chipped.
The Dies are not inserted
in the correct position.
The Dies are worn.
The Dies are chipped.
Threading oil has
deteriorated.
The Dies are not inserted
in the correct position.
Scrap is in the way.
Amount of oil is too low.
Scrap clogging the flow.
The Die-head is not fitted
correctly.
Rear chuck is set too low.
The Die-head is not
adjusted correctly.
The Die-head is not
adjusted correctly.
Die-head is obstructed by
cut-off pipe etc. on top of
the Tank cover.
17
Servicing and Repairs