
Contents are subject to change without notice.
OPERATION MANUAL 
Extension Adaptor
ECN - 011
Thank you for purchasing the Extension Adaptor " ECN - 011". This Extension Adaptor is designed for connecting to 
the Espert 500 motor and using with Emax Evolution series attachments or the ROTUS series attachments. 
Read this and all the associated component Operation Manuals carefully before use. Always keep this Operation 
Manual in a place where a user can referred to for reference at any time.
1. CAUTIONS FOR HANDLING AND OPERATION
■Read these warnings and cautions carefully and only use in the manner intended.
■These warnings and cautions are intended to avoid potential hazards that could result in personal injury to the 
operator or damage to the device. These are classi¿ed as follows in accordance with the seriousness of the risk.
Class Degree of Risk
 WARNING A safety hazard could result in bodily injury or damage to the device if 
the safety instructions are not properly followed.
 CAUTION A hazard that could result in light or moderate bodily injury or damage 
to the device if the safety instructions are not followed.
①This Extension Adaptor is designed for hand tool use.
The Extension Adaptor is installed during Espert 500 motors and the Emax Evolution 
attachments or the ROTUS attachments and used. 
②Do not touch the cutting tool while it is running. It is very dangerous.
③Wear safety glasses, dust mask, and use a protective cover around the Extension Adaptor 
whenever the Extension Adaptor is rotating.
④
Do not apply excessive force. This may cause tool slippage, tool damage, injury to the operator, 
loss of concentricity and precision.
WARNING
CAUTION
①Do not drop or hit this Extension Adaptor, as shock can damage to the internal components.
②When cleaning an Extension Adaptor, stop the motor and remove debris with a soft brush or 
a cloth. Do not blow air into the Extension Adaptor with compressed air as foreign particles or 
cutting debris may get into the ball bearing. 
③Make sure that the transmission clutches engage ¿rmly, when connecting to the motor and the 
attachment.
④Stop working immediately when abnormal rotation or unusual vibration are observed. 
Immediately, please check the content of section " 8. TROUBLESHOOTING ". 
⑤No lubrication is required because grease impregnated ball bearings are used.
⑥After installation, repair, initial operation, or long periods of non operation, please carry out 
break-in as follow. Start rotating slowly and over a short period of 5 - 10minutes, increase 
speed gradually until allowable maximum speed.
⑦Do not disassemble, modify or attempt to repair this Extension Adaptor. Additional damage 
will occur to the internal components. Service must be performed by NSK NAKANISHI or an 
authorized service center. 
Table. 1Packing Contents list
When opening the package, check if it includes all items listed in " Table.1 Packing Contents List ".
In the event of any shortage, please contact either us (see the " 4. CONTACT US " section) or your dealer.
2. BASIC PACKAGE
ECN - 011・・1pc. Wrench (20 x 24)・・1pc. Operation Manual・・1set.
20
24
ྲྀᢅㄝ᭩
OPERATION MANUAL
3. WARRANTY
We provide a limited warranty for our products. We will repair or replace the products if the cause of failure is due 
to the following manufactures defects. Please contact us or your local distributor for the details.
①Defect in manufacturing.
②Any shortage in the package.
③Where it is found any damage has occurred when opening the package.
(This shall not apply if the damage was caused by the negligence of a customer)
5. FEATURES
This Extension Adaptor is developed for using with the Emax Evolution series attachment and ROTUS series 
attachment to be connected to Espert 500 motor.
6. SPECIFICATIONS AND DIMENSIONS
6 - 1 Speci¿cations
Model ECN - 011
Maximun Motor Rotation Speed 40,000min-1 
Continuous use rotating speed : Less than 30,000min-1
Appropriate Motor Espert 500 Motor (ENK - 500C, ENK - 500T)
Weight 31g
Fig. 1
(11.3)
ȭ22.4
ȭ18.9
29
40.3
6 - 2 Outside View
Align the thread on the front end of the motor and the rear 
of the Extension Adaptor, and turn the Extension Adaptor 
clockwise. If the drive shaft of the motor does not engage 
properly to the drive dog on the Extension Adaptor, it may 
only turn aprroximately two threads before stopping. DO NOT 
FORCE THEM TOGETHER. Turn the Extension Adaptor back 
a few threads, rotate the Extension Adaptor by hand to engage 
the drive shaft and the drive dog, and make the ¿nal turns.
Transmission clutch
Tighten Turn
Fig. 2
7. CONNECTION OF THE EXTENSION ADAPTOR TO THE MOTOR
CAUTION
Make sure your hands and all interlocking parts of the Extension Adaptor and motor are clean 
before connecting the motor to the Extension Adaptor. This is critical in preventing contaminants 
from entering the motor or Extension Adaptor.
8. TROUBLESHOOTING
If a problem or concern occur, please check the following items prior to consulting your dealer.
Trouble Cause Inspection / Corrective Action
Extension Adaptor 
does not run.
The Extension Adaptors ball bearings have been damaged.
Replace the ball bearings.
(Return to NAKANISHI dealer 
service.)
Overheating during 
rotation.
Cutting debris has contaminated the ball bearings, and 
the ball bearings are damaged.
Abnormal vibration or 
noise during rotation.
Cutting debris has contaminated the ball bearings.
The Extension Adaptors ball bearings have been damaged. 
9. DISPOSAL OF THE EXTENSION ADAPTOR
When disposal of an Extension Adaptor is necessary, follow the instructions from your local government agency for 
proper disposal of industrial components.
2016.XX.XX XXX י
4. CONTACT US
For safe use / purchase of our products, we welcome your questions.
If you have any questions about operation, maintenance and repair of the product, please contact us.
Company Name
Business Hours
U.S. Toll Free No.
Telephone No.
Fax No.
Web Address
:Industrial Div. 
: 8:30am to 17:00pm (CST)
 (closed Saturday, Sunday and Public Holidays)
: 800-585-4675
: 847-843-7664
: 847-843-7622
: www.nskamericacorp.com
Contact UsContact Us
For U.S. Market
Company Name
Business Hours
Telephone No.
e-mail Address
: 
: 8:00am to 17:00pm
 (closed Saturday, Sunday and Public Holidays)
: +81 (0) 289-64-3520
For Other Markets