Elliott ET720-1800 Manual

www.elliott-tool.com
Tube & Pipe Cleaners Tube Testers Tube Plugs Tube Removal Tube Installation
Pneumatic Torque Control Model ET720-1800
Operating and Maintenance Instructions

TABLE OF CONTENTS
Introduction .......................................................................................................... 4
Safety Guidelines ................................................................................................. 5
Operation Instructions.......................................................................................... 7
Service Instructions.............................................................................................. 9
Parts List & Diagrams......................................................................................... 12
Warranty ............................................................................................................. 14

4 ET720 Motor
INTRODUCTION
Thank you for purchasing this Elliott product. More than 100 years of experience have been employed
in the design and manufacture of this control, representing the highest standard of quality, value and
durability. Elliott tools have proven themselves in thousands of hours of trouble-free eld operation.
If this is your rst Elliott purchase, welcome to our company; our products are our ambassadors.
If this is a repeat purchase, you can rest assured that the same value you have received in the past
will continue with all of your purchases, now and in the future.
If you have any questions regarding this product, manual or operating instructions, please call Elliott
at [phone] toll free (USA only) or [phone], or fax us at [phone]
for immediate service.

ET720 Motor 5
SAFETY GUIDELINES
Read and save all instructions. Before use, be sure everyone using this machine reads and
understands this manual, as well as any labels packaged with or attached to the machine.
• Know Your Elliott Tool. Read this manual carefully to learn your tool’s application and
limitations as well as the potential hazards specic to this tool.
• Keep Work Area Clean and Well Lit. Cluttered, dark work areas invite accidents.
• Dress Properly. Do not wear loose clothing or jewelry. Wear a protective hair covering
to contain long hair. It is recommended that the operator wear safety glasses with
side shields or a full face shield eye protection. Gloves and water repellant, nonskid
footwear are also recommended. Keep hands and gloves away from moving parts.
• Use Safety Equipment. Everyone in the work area should wear safety goggles or
glasses with side shields complying with current safety standards. Wear hearing
protection during extended use, respirator for a conned space and a dust mask for
dusty operations. Hard hats, face shields, safety shoes, respirators, etc. should be
used when specied or necessary. Keep a re extinguisher nearby.
• Use The Right Tools. Do not force a tool or attachment to do a job or operate at a
speed it was not designed for.
• Use Proper Accessories. Use Elliott accessories only. Be sure accessories are properly
installed and maintained.
• Check for Damaged Parts. Inspect guards and other parts before use. Check for
misalignment, binding of moving parts, improper mounting, broken parts or any other
conditions that may affect operation. If abnormal noise or vibration occurs, turn the
tool off immediately and have the problem corrected before further use. Do not use a
damaged tool. Tag damaged tools “Do Not Use” until repaired. A damaged part should
be properly repaired or replaced by an Elliott service facility. For all repairs, insist on
only identical replacement parts.
• Keep Hands Away from All Moving Parts.
CAUTION
!
CAUTION
!
Caution: Impact resistant protection must be worn
while operating or working near this tool.
Caution: Personal hearing protection is highly
recommended when operating or working near this
tool.

6 ET720 Motor
• Do Not Overreach. Maintain Control. Keep proper footing and balance at all times.
• Stay Alert. Watch what you are doing, and use common sense. DO NOT use a
tool when you are tired, distracted or under the inuence of drugs, alcohol or any
medication causing decreased control.
• Maintain Tool Carefully. Keep tools sharp and clean for best and safest performance.
Follow instructions for lubrication, maintenance and changing accessories.
• Maintain Labels and Nameplates. These carry important information and will assist you
in ordering spare and replacement parts. If unreadable or missing, contact an Elliott
service facility for a replacement.
• Some individuals are susceptible to disorders of the hands and arms when exposed to
task which involve highly repetitive motions or vibration. Those individuals predisposed
to vasculatory or circulation problems may be particularly susceptible. Cumulative
trauma disorders such as Carpal Tunnel Syndrome and Tendonitis can be caused
by repetitions, forceful exertions of the hands and arms. These disorders develop
gradually over periods of weeks, months and years.
• Tasks should be performed in such a manner that the wrists are maintained in a neutral
position, which is not exed, hyper extended, or turned side to side.
• Stressful postures should be avoided and can be controlled through tool selection and
work location. Any user suffering from prolonged symptoms of tingling, numbness,
clumsiness or weakened grip, nocturnal pain in the hand or any other disorder of
the shoulders, arms, wrists or ngers is advised to consult with a physician. If it is
determined that the symptoms are job related or aggravated by movements and
postures dictated by the job design it may be necessary for the employer to take
steps to prevent further occurrences. These steps might include, but are not limited to
repositioning the work piece or redesigning the work station, reassigning workers to
other jobs, rotating jobs, altering work pace and/or changing the type of tools used so
as to minimize stress on the operator. Some tasks may require more than one type of
tool to obtain the optimum operator/tool/task relationship.
• The following recommendations will help reduce or moderate the effects of repetitive
work motions and/or extended vibration exposure.
a.) Use a minimum hand grip force consistent with proper control and safe operation.
b.) Keep body and hands warm and dry.
c.) Avoid anything that inhibits blood circulation (ie. Smoking Tobacco, Cold
Temperatures, etc)
d.) Avoid highly repetitive movements of hands and wrists, and continuous vibration
exposure.
• Work gloves with vibration reducing liners and wrist supports are available from some
manufactures of industrial work gloves. Tool wraps and grips are also available from
a number of different manufacturers. WARNING! Proper t gloves are important.
Improperly tted gloves may restrict blood ow to the ngers and can substantially
reduce grip strength.
SAFETY GUIDELINES

ET720 Motor 7
OPERATION INSTRUCTIONS
Operation
The Model ET720-1800 is a trigger operated rolling control with an automatic, torque controlled
reversal. It is designed for use with regulated, ltered and lubricated 90 psig air (measured at the tool
inlet), but can be used at lower pressures to lower the minimum torque setting if required (with some
loss of free speed). The operator pulls the trigger to start the tool (before engaging the expander
mandrel in soft tubes to avoid “staking”) and holds it until the entire rolling operation is completed. The
tool expands to a preset torque, reverses automatically and backs out to release the mandrel. The tool
stops and resets when the operator releases the trigger between tubes. If necessary, the tool can be
started in reverse by unscrewing the clutch housing (3) three or four turns and pulling back gently on
the tool before pulling the trigger.
Torque Adjustment
Remove clutch housing (3) (left hand thread) and spindle/clutch assembly from tool, taking care to
avoid loss of push rod (25) or spring (24). Hold clutch driver (22) with a 3/8” wrench and turn the
adjusting nut (7) with a 3/4” open end wrench (right hand thread). Compressing the torque spring (9)
increases the torque setting. Reinstall the spindle/clutch assembly and the clutch housing (3) carefully
to avoid damaging the push rod. For very light torque settings, the adjusting nut (7) can be locked to
the spindle with a #8-32 x 3/16” nylon tipped set screw (not included).
Changing The Torque Regulating Spring
Remove clutch housing (3) (left hand thread) and spindle/clutch assembly from the tool. Remove
the socket head cap screw and the chuck assembly (1), wave washer (4), bearing (5), c-ring (6), lock
nut (7), lock washer (8) and torque spring (9) and install the correct torque spring required for the
application and reassemble parts in reverse order. Make sure that the wave washer (4) is centered on
the bearing guard (2) (1/4” chuck) or chuck body (1) (3/8” chuck) before securing the chuck. With the
1/4” chuck, it is important to always keep the socket head cap screw tight to avoid excessive wear
to the spindle (14) and the chuck body. Set and test tool to verify that it reaches the adjusted preset
torque and auto reverses properly before resuming operations - SEE CAUTION.
CAUTION
!
CAUTION: IF THE CLUTCH IS ADJUSTED OVER THE MAXIMUM POWER
OUTPUT OF THE TOOL, THE CLUTCH WILL NOT FUNCTION AND THE
TOOL WILL OPERATE LIKE A STALL TYPE TOOL. ALSO, IF THE TOOL
IS BEING OPERATED AT ITS UPPER TORQUE LIMITS, A DROP IN AIR
PRESSURE COULD CAUSE THE CLUTCH NOT TO FUNCTION DUE TO
A LOSS OF MOTOR POWER AND THE TOOL WILL FUNCTION LIKE A
STALL TYPE TOOL. OPERATIONAL CHECK: GRIP TOOL SECURELY
AND BE PREPARED TO COUNTERACT STALL TORQUE IN CASE THE
CLUTCH IS IMPROPERLY ADJUSTED.

8 ET720 Motor
OPERATION INSTRUCTIONS
Air Supply
The tool is designed to operate on 90 psig maximum air pressure. The air pressure should be checked
at the tool’s inlet when the tool is running. An automatic in-line lter-lubricator is required. This will
sustain the tool with clean, lubricated air; keeping it in sustained operation; and increase tool life.
For maximum performance, use a 1/4” I.D. minimum air hose up to 8 feet in length. If additional length
is required, a 3/8” I.D. or larger hose should be connected to the 1/4” hose (or use 3/8” I.D. hose or
larger the full length).
The air hose should be cleared of accumulated dirt and moisture. Then pour one half (1/2) teaspoon of
10W machine oil into the tool’s air inlet before connecting the hose to the tool. A new hose should be
similarly lubricated before placing in service. The tool should be cycled several times to disperse the
oil before rolling tubes.
Lubrication
The in-line lubricator should be regularly checked and kept lled with a good grade of 10W machine
oil. Application of the tool should govern how frequently it is greased. It is recommended that the
idler gears (30) receive a generous amount of No.2 Moly grease after every 40 hours of operation. The
clutch housing (3) (left hand threads) and the clutch/spindle/driver assembly must be removed and the
grease applied through the hex in the spider (28).

ET720 Motor 9
SERVICE INSTRUCTIONS
Disassembly
Clamp the handle (55) in a soft jawed vise and unscrew (left hand threads) the clutch housing (3) and
remove the shaft/clutch assembly (6 thru 25). Pull out the push rod (25) and spring (24). Unscrew the
gear case (31) from the handle assembly (55). The motor package (32 thru 42) and spool valve sub
assembly (43) can now be removed from the handle assembly (55). See the following paragraphs for
disassembly instructions for the various sub-assemblies.
Handle Maintenance
Unscrew the air inlet bushing (51) and remove the air inlet screen (52), spring (53) and throttle valve
(54). The air inlet screen should be washed in solvent and blown out in reverse of normal air ow.
Replace the screen if clogged or torn. Inspect the seal on the throttle valve (54) and replace the valve
if necessary. Inspect the O-rings (49 & 50) and replace if necessary. If replacement of the trigger (44)
or throttle pin (45) becomes necessary, check that the spring pin (47) will clear the back of the trigger
slot before installing the pin. If there is interference, grind off enough of the throttle pin (45) so that the
trigger will clear. If this is not done, the tool will not shut off when the trigger is released. Before putting
the throttle valve (54) back into the tool, push the throttle pin (45) all the way forward and make sure
that the notch in the end of the throttle pin is vertical so that the throttle pin will engage the throttle
valve properly after assembly.
Clutch Disassembly
Disassemble the spindle/clutch assembly per instructions in CHANGING THE TORQUE REGULATING
SPRING. Remove snap ring (23), clutch driver (22) and washers (20 & 21). Drive out the 1/16” x 3/8”
spring pin (15) and remove the washer (10), cam (11), six balls (17), trip (16), spring bushing (19), spring
(18), retaining ring (12) and clutch (13).
Gear Case Assembly
The spider w/ pins (28) should be pressed out of the rear of the gear case (31). Remove the retainer
ring (26) and press the bearing (27) out of the front of the gear case (31). If replacement of the idler
gear pins (30) is necessary, they should be pressed out of the rear of the spider (28). See Figure 1 for
replacement pin height.
PART NO.
SUPERSEDES
THIS DRAWING CONTAINS INFORMATION OF A
PROPRIETARY NATURE AND IS ISSUED FOR
REFERENCE USE ONLY AND MAY NOT BE COPIED,
REPRODUCED OR USED TO MANUFACTURE ANYTHING
SHOWN HEREON WITHOUT WRITTEN PERMISSION.
ENG
CHECK
DRAW DATE TOOL NO.
CHECK DATE PART NO.
PROJECT NO.
DESCRIPTION
MAT'L SPEC MAT'L REQUIRED
HARDNESS PROCESS SPEC
FINISH
WEIGHT (LBS.) VOLUME (CU. IN.)
TOLERANCES
UNLESS OTHERWISE SPECIFIED
.XX = ±.02
.XXX = ±.005
ANGLES = ±.5°
BREAK SHARP CORNERS .030" MAX.
MACHINED SURFACES - 125 MICRO. MAX.
DIMENSIONS ENCLOSED IN PARENTHESIS
ARE FOR REFERENCE ONLY
DIAMETERS ON COMMON CENTERS
TO BE CONCENTRIC WITHIN .003" T.I.R.
DO NOT SCALE DRAWING
MARKING METHOD
M
REV ECN DATE ENG DESCRIPTION
1/21/2019
.240
.255
Fig. 1 - SINGLE REDUCTION SPIDER

10 ET720 Motor
SERVICE INSTRUCTIONS
Motor Disassembly
Slip the front bearing plate (34) and bearing (33) off the front of the rotor (37) and remove the cylinder
(42) and four (4) rotor blades (36). Set the rear bearing plate assembly (43) on the vise jaws with the
rotor (37) hanging down. Use a 7/32” punch to drive the rotor (37) out of the rear rotor bearing.
Reassembly In General
All parts should be washed in a solvent and inspected for damage or wear. Particular attention should
be given to all bearings, gears, gear pins and rotor blades as failure of these parts could cause
damage to more expensive parts. Rotor blades should be replaced if they measure less than 3/16”
on either end. Inspect and replace any O-rings or seals that show signs of wear or deterioration. All
gears, gear pins and open bearings should receive a generous amount of No.2 Moly grease during
reassembly. When assembling the gear case to the back head, the case should be tightened to a
torque of 300/325 in. lbs. (33.9/36.7 Nm). Do Not Over-tighten, as it can distort the valve assembly
and cause the valve to stick. Reassembly of all of the various sub-assemblies is in the reverse order
of disassembly; however, the following paragraphs list some of the more important reassembly
procedures.
Clutch Assembly
During the reassembly of the spindle/clutch assembly, all parts should receive a thin coating of a
mixture of 10W machine oil and No.2 Moly grease. The clutch (13), retaining ring (12), spring (18),
spring bushing (19), trip (16), balls (17), cam (11) and washer (10) must be in position on the clutch
shaft (14) before installing the spring pin (15). Install the spring pin (15) so it is below the surface at
both ends. The installation of the balls (17) can be simplied by lling the ball slots in the clutch shaft
(14) with grease if desired.
Motor Assembly
Install the rotor bearing (33) into the rear bearing plate (42). Press the rear bearing plate assembly
(press the bearing’s inner race) onto the rear shaft of rotor (37) until there is approximately .001”
clearance between the rear bearing plate (42) and the rotor. Install the cylinder (40) with the slotted end
toward the front and install 4 paddles (36). Install bearing (33) into front bearing plate (34). Press the
front bearing plate assembly (press the bearing’s inner race) onto the front shaft of rotor (37) until there
is approximately .001” clearance between the front bearing plate (34) and the rotor. If a new rotor or
complete motor assembly is to be installed, rst use RC609 Loctite when installing a push rod guide
(38) – with the countersunk end in rst, and the other end ush with the rear of the rotor shaft.

ET720 Motor 11
SERVICE INSTRUCTIONS
Push Rod
It is essential that the push rod be straight and that the ends be uniformly rounded and free from burrs,
or erratic operation can result. The length of the push rod (25) determines the location of the valve
spool when the tool is running forward and has been sized to be used without trimming in most cases.
When installing a replacement push rod - before screwing on the clutch cover, make sure that the two
washers (20 & 21) are in place and that the end of the push rod does not touch the end of the trip (16)
when the spindle assembly is held tightly in position. If the rod must be shortened, grind uniformly off
the VALVE END of the rod just enough to allow the trip to reset without interference.
Safety Check
After repair or replacement of parts, servicing or prolonged storage, the tool should be tested to verify
that it reaches the adjusted preset torque and auto reverses properly.

12 ET720 Motor
PARTS LISTS & DIAGRAMS
PNEUMATIC TORQUE CONTROL
Model ET720-1800
1
2
3
4
5
6
7
827
28
29
30
31
32
33
34
36
37
38
10
11
12
13
14
16
15
17
22
40
42
44
45
46
51
20
21
19
25
18
9
24
47
26
49
39
41
43
50
35
48
55
52
53
54
23

ET720 Motor 13
PARTS LISTS & DIAGRAMS
PARTS LIST
DESCRIPTION
PART NUMBER
QTY
ITEM
QUICK CHANGE CHUCKET720-025-037
11
BEARING GUARDET856718112
CLUTCH HOUSINGET856719613
WAVE WASHER41-90134A036
14
RADIAL BALL BEARINGPC80-6001-2RS15
RETAINING RING, EXTERNAL, CRESCENT, 7/16
P8719-4316
LOCK NUTET3151200
17
LOCKWASHERET3151000
1
8
TORQUE SPRING PLAIN (2-11 INCH LBS.)
ET311880019
TORQUE SPRING YELLOW (6-30 INCH LBS.)ET3150300
1
9
GUIDE WASHERET3161300
1
10
CAMET8566533111
RETAINING RING, EXTERNAL, INVERTED, 1/2P8574-50
1
12
DRIVE CLUTCHET8566532113
CLUTCH SHAFTET8566867114
SPRING PIN, 1/16 X 3/8P8688-6
115
TRIPET8566873116
BALL, STEEL, 1/8
109BA617
COMPRESSION SPRINGET3160995
1
18
SPRING BUSHINGET3161007
1
19
SHAFT WASHER
ET8567157
120
NYLON WASHER, #10591-15
1
21
CLUTCH DRIVEET8566868122
SNAP RING
596-13
1
23
COMPRESSION SPRINGET3150200
1
24
PUSH RODET8567197125
RETAINING RING
P8374-125
1
26
RADIAL BALL BEARINGPC80-6002127
PARTS LIST
DESCRIPTION
PART NUMBER
QTY
ITEM
GEAR SPIDER W/ PINSET867872
1
28
RADIAL BEARINGPC80B2-1/2-4329
IDLER GEARET867866330
GEAR CASEET867871131
SPACERET867873132
RADIAL BALL BEARINGPC80R4233
FRONT BEARING PLATEET867935
1
34
DRIVE SCREWP8370-7135
PADDLEET863738436
ROTORET867885
1
37
PUSH ROD GUIDEET8567145138
SPRING PIN, 3/32 X 7/16P8381-7139
CYLINDERET867936
1
40
SPRING PIN, 3/32 X 1
P8381-16141
REAR BEARING PLATEET867937142
VALVE CASE / SPOOL ASSEMBLY
ET720VCSA
1
43
TRIGGER
ET867054
144
THROTTLE PINET867939145
TRIGGER BUSHINGET867054B146
SPRING PIN, 1/8 X 3/4P8382-12
147
MUFFLER
41-4450K3
1
48
O-RING, 1/16 X 5/8
P8309-016149
O-RING, 3/32 X 9/16
P8309-11
1
50
AIR INLET
ET867929
151
AIR INLET SCREEN41-9317T132152
TAPERED SPRINGET3132300153
THROTTLE VALVEET869350154
PISTOL GRIP HANDLE ASSEMBLYET720PGHA155
PNEUMATIC TORQUE CONTROL
Model ET720-1800

14 ET720 Motor
WARRANTY
Should any part, of Seller’s own manufacture, prove to have been defective in material or workmanship
when shipped (as determined by Seller), Seller warrants that it will, at its sole option, repair or replace
said part f.o.b., point of manufacture, provided that Buyer noties, in writing, of such defect within
twelve (12) months from date of shipment from the manufacturing plant.
On request of Seller, the part claimed to be defective will be returned, transportation, insurance, taxes
and duties prepaid, to the factory where made, for inspection. Any item, which has been purchased by
Seller, is warranted only to the extent of the original manufacturer’s warranty to Seller.
Seller shall not be liable for any damages or delays caused by defective material or workmanship.
No allowance will be made for repairs or alterations made by others without Seller’s written consent or
approval. If repairs or alterations are attempted without Seller’s consent, Seller’s warranty is void.
THE WARRANTIES PROVIDED IN THE OBLIGATIONS AND LIABILITIES OF SELLER HEREUNDER,
AND THE RIGHTS AND REMEDIES OF BUYER HEREUNDER ARE EXCLUSIVE AND IN
SUBSTITUTION FOR, AND BUYER HEREBY WAIVES ALL OTHER WARRANTIES, GUARANTEES,
OBLIGATIONS, CLAIMS FOR LIABILITIES, RIGHTS AND REMEDIES, EXPRESS OR IMPLIED,
ARISING BY LAW OR OTHERWISE, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTY
FOR MERCHANTABILITY AND FITNESS FOR PURPOSE.
Seller’s total liability is limited to the lower of the cost of repair or replacement.

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Phone: [phone] • [phone]
Fax: [phone]
www.elliott-tool.com
Printed in the USA
©01/2019 Elliott Tool Technologies, Ltd.
TM-133
PL-116
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