Centech CEN-TECH 66400 User manual

Digital Contact Tachometer
Item 66400
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
When unpacking, make sure that the product is intact and undamaged.
If any parts are missing or broken, please call 1-800-444-3353 as soon as possible.
Visit our website at: http://www.harborfreight.com
Copyright©2008 by Harbor Freight Tools®. All rights reserved. No portion of this manual or any artwork contained herein may be reproduced in any shape
or form without the express written consent of Harbor Freight Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein. Tools required for assembly and service may not be included.
Specications
Display LCD 5 Digits
RPM Range 2.5 - 19,999 RPM
Accuracy ± 0.05 plus 1 RPM
Power Source 4x ‘AA’ Batteries
(Not Supplied)
Operating
Environment
32° - 104° F; 0 - 50° C
< 85% Humidity
IMPORTANT SAFETY
INFORMATION
1. When in use, this tool is in contact with rotating parts.
2. Do not touch rotating parts. Do not wear
loose clothing when working with rotating
parts. Contain hair, jewelry and any item that
may become entangled in rotating part.
Email tech support at: [email protected]
Manual Revised 11f

Page 2 For technical questions, please call 1-800-444-3353. SKU 66400
3. This product is not a toy. Do not allow
children to play with or near this item.
4. Position batteries in proper polarity and
do not install batteries of different types,
charge levels, or capacities together.
5. Use as intended only.
6. Inspect before every use; do not use
if parts are loose or damaged.
7. Maintain product labels and nameplates.
These carry important safety information.
If unreadable or missing, contact Harbor
Freight Tools for a replacement.
Important Components and Controls
Axle
Function Switch
MEMORY Button
TEST Button
Display
Axle: Install the selected Adapter on this Axle.
TEST Button: Use to perform Tests.
LCD Display: Information is displayed on this screen.
MEMORY Button: Use to recall last reading, minimum
reading and maximum reading of last test.
Function Switch: Use to select desired measurement:
a. FT/MIN Surface speed in Feet per Minute
b. M/MIN Surface Speed in Meters per Minute
c. CONTACT Rotation speed in RPM
Display
CONTACT RPM
MAX MIN
ft/min m/min
Symbol Meanings:
Battery Symbol: Batteries need to be replaced.
Operating with discharged batteries
may cause erratic results.
MAX: Maximum reading is displayed.
MIN: Minimum reading is displayed.
CONTACT: Unit is ready to start test.
ft/min: Surface speed in Feet per minute.
m/min: Surface speed in Meters per minute.
RPM: Rotational speed in revolutions per minute.

Page 3For technical questions, please call 1-800-444-3353.SKU 66400
Set Up
Read the ENTIRE IMPORTANT SAFETY
INFORMATION section at the beginning of
this document including all text under
subheadings therein before set up or use
of this product.
Battery Installation
1.
Battery Compartment
Before use, install four ‘AA’ batteries (not supplied).
2. To install batteries, remove Bolt (18)
from Battery Cover (17).
3. Remove Battery Cover (17) from Back Cover (12).
4. Install four ‘AA’ batteries in battery compartment.
Match battery polarity to battery case markings.
5. Replace Battery Cover (17).
Reinstall Bolt (18). Do not overtighten.
6. Whenever the Low Battery Indicator
appears, replace the batteries.
7. Do not short the battery terminals
together when replacing batteries.
8. Do not dispose of old batteries in re. Always
dispose of batteries in accordance with
guidelines provided by local authority.
Note: This tool may be powered using an AC adaptor
instead. Plug adapter (not included) into
adapter Socket and into a 120 V~ outlet.
Installing Adapters
1.
Installing Adapter
Before use, the correct Adapter must be installed.
- Cone RPM Adapter (24, 25)
- Funnel RPM Adapter (23)
- Linear Speed Adapter (19, 20)
2. The Adapters are held in place by the Spring Ball
Bearing (26). Slide the Adapter on or off as needed.
Operation
RPM Measurement
1. Attach the Cone or Funnel Adapter to
the Axle (27) as described above.
2. Set Function Switch to CONTACT.
3. Press the tip of the cone to the center of the rotating
shaft to read shaft RPM. Keep the Tachometer’s
Axle in line with the center of the shaft at all times.
4. Press and hold the TEST button.
5. When the cone gains steady rotational speed,
read the RPM on the LCD screen.
Linear Speed Measurement
1. Attach the Linear Speed Adapter Wheel (20)
to the Axle (27) as described above.
2. Set the Function Switch to FT/MIN (Feet per
minute) or M/MIN (Meter per minute).
3. With the Axle parallel to the rotating shaft, touch the
side of the shaft with the side of Adapter Wheel (20).
Maintain light and steady pressure against the shaft.
4. Press and hold the TEST button.
5. When the cone gains steady rotational speed,
read the RPM on the LCD screen.
REV 09c

Page 4 For technical questions, please call 1-800-444-3353. SKU 66400
Memory Function
1. After each test, you can review most
recent saved measurements.
2. Press and release MEMORY button to cycle
through most recent MIN and MAX readings.
Record Serial Number Here:
Note: If product has no serial number, record
month and year of purchase instead.
Note: Some parts are listed and shown for
illustration purposes only, and are not available
individually as replacement parts.
PLEASE READ THE
FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR
HAS PROVIDED THE PARTS LIST AND ASSEMBLY
DIAGRAM IN THIS DOCUMENT AS A REFERENCE
TOOL ONLY. NEITHER THE MANUFACTURER OR
DISTRIBUTOR MAKES ANY REPRESENTATION
OR WARRANTY OF ANY KIND TO THE BUYER
THAT HE OR SHE IS QUALIFIED TO MAKE ANY
REPAIRS TO THE PRODUCT, OR THAT HE OR SHE
IS QUALIFIED TO REPLACE ANY PARTS OF THE
PRODUCT. IN FACT, THE MANUFACTURER AND/
OR DISTRIBUTOR EXPRESSLY STATES THAT ALL
REPAIRS AND PARTS REPLACEMENTS SHOULD
BE UNDERTAKEN BY CERTIFIED AND LICENSED
TECHNICIANS, AND NOT BY THE BUYER. THE
BUYER ASSUMES ALL RISK AND LIABILITY ARISING
OUT OF HIS OR HER REPAIRS TO THE ORIGINAL
PRODUCT OR REPLACEMENT PARTS THERETO,
OR ARISING OUT OF HIS OR HER INSTALLATION
OF REPLACEMENT PARTS THERETO.
Parts List
Part Description Qty.
1 Front Cover 1
2 Function Switch 1
3 Memory Button 1
4 LCD Window 1
5 End Cap 1
6 LCD 1
7 Conductive Rubber Gasket 1
8 LCD Holder 1
9 Spring 1
10 Printed Circuit Board (PCB) 1
11 PCB Cover 1
12 Back Cover 1
13 Battery Connector 1 set
14 Screw 2.9 x 12 5
15 TEST Button 1
16 ‘AA’ Battery (not included) 4
17 Battery Cover 1
18 Bolt m2.5 x 6 1
19 Linear Speed Adapter Base 1
20 Linear Speed Adapter Wheel 1
21 Linear Speed Adapter Cover 1
22 Screw 2.5 x 8 3
23 Funnel RPM Adapter 1
24 Cone RPM Adapter Head 1
25 Cone RPM Adapter Base 1
26 Spring Ball Bearing m1.5 x 6 1 set
27 Axle 1
28 Axle Tree (607) 1
29 Pulse Counter Wheel 1
30 Gasket 1
31 Bolt m2 x 6.5 1
32 Screw 2.3 x 8 5

Page 5For technical questions, please call 1-800-444-3353.SKU 66400
Assembly Diagram

Page 6 For technical questions, please call 1-800-444-3353. SKU 66400
Limited 90 Day Warranty
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards,
and warrants to the original purchaser that this product is free from defects in materials and workmanship for the
period of 90 days from the date of purchase. This warranty does not apply to damage due directly or indirectly,
to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities, criminal activity, improper
installation, normal wear and tear, or to lack of maintenance. We shall in no event be liable for death, injuries
to persons or property, or for incidental, contingent, special or consequential damages arising from the use of
our product. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the
above limitation of exclusion may not apply to you. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with transportation charges
prepaid. Proof of purchase date and an explanation of the complaint must accompany the merchandise.
If our inspection veries the defect, we will either repair or replace the product at our election or we may
elect to refund the purchase price if we cannot readily and quickly provide you with a replacement. We will
return repaired products at our expense, but if we determine there is no defect, or that the defect resulted
from causes not within the scope of our warranty, then you must bear the cost of returning the product.
This warranty gives you specic legal rights and you may also have other rights which vary from state to state.

3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • [phone]