Distek, Inc. Service Note: 2500x-1090 Page 1 of 6
121 North Center Drive
North Brunswick, NJ 08902 USA
P: 732-422-7585 F: 732-422-7310 TOLL FREE: 888-234-7835
This document contains confidential and proprietary information which is not to be disclosed to others for any purpose nor used for manufacturing
purposed with written permission from Distek, Inc.
Service Note
Date
17 Dec 2013
Service Note #
2500x-1090
Updated
NA
Product
Model 2500
Created By
J. Yangco
Description
Installing the New Drive Pulley Assembly
Release
Internal
Distributors
Customers
Parts Required
Serial Numbers Affected
Drive Pulley Assembly (2800-0290)
2501130 and older
Installing the New Drive Pulley Assembly
Improvements made with the new drive pulley assembly:
1. Reduces RPM fluctuations occasionally seen on the display and on printed report.
2. Eliminates audible clicking noise coming from drive pulley when stirring.
3. Reduces the stirring spindle sleeve from rocking back and forth.
Old Design
New Design
Distek, Inc. Service Note: 2500x-1090 Page 2 of 6
121 North Center Drive
North Brunswick, NJ 08902 USA
P: 732-422-7585 F: 732-422-7310 TOLL FREE: 888-234-7835
This document contains confidential and proprietary information which is not to be disclosed to others for any purpose nor used for manufacturing
purposed with written permission from Distek, Inc.
Service Note
Before proceeding, discharge any static electricity from your body by touching a bare screw from the
instrument. Turn off the instrument and disconnect the AC power cord.
Solution / Action
Step 1
Using a Phillips Head Screw Driver, remove the nine screws from underneath the drive plate and
the one screw located on the top rear of the cover.
Step 1
Step 2
Remove the drive plate cover by holding both sides and raising the cover up.
Step 2
Step 3
Remove the spindle drive belt by pulling it off the idler wheel as shown.
Step 3
Distek, Inc. Service Note: 2500x-1090 Page 3 of 6
121 North Center Drive
North Brunswick, NJ 08902 USA
P: 732-422-7585 F: 732-422-7310 TOLL FREE: 888-234-7835
This document contains confidential and proprietary information which is not to be disclosed to others for any purpose nor used for manufacturing
purposed with written permission from Distek, Inc.
Service Note
Step 4
Locate the three screws on the underside of the drive plate that secure the drive pulley
assembly as shown. Using a hex key (9/64” hex key), remove the 3 hex head screws and drive
pulley assembly from the instrument.
Step 4
An old style drive pulley assembly (2800-0253) can be identified by the three
screws required to fasten the assembly on the drive plate.
Step 5
Loosen the set screws (1/16" hex key) of the bottom pulley as shown.
Step 5
Step 6
Lift the top pulley (with the spindle sleeve) and remove it from the c-shaped bracket as shown.
Step 6
Distek, Inc. Service Note: 2500x-1090 Page 4 of 6
121 North Center Drive
North Brunswick, NJ 08902 USA
P: 732-422-7585 F: 732-422-7310 TOLL FREE: 888-234-7835
This document contains confidential and proprietary information which is not to be disclosed to others for any purpose nor used for manufacturing
purposed with written permission from Distek, Inc.
Service Note
Step 7
Use the two front slots to mount the c-shaped bracket tight enough on the drive plate that it is
secure but can still be moved for final adjustment.
Step 7
Step 8
Position the bottom pulley in the c-shaped bracket with the motor drive belt as shown.
Step 8
Be sure that the drive belt on the motor side still goes around the pulley. Reposition the drive
belt if necessary.
Step 9
Insert the top pulley with sleeve into the c-shaped bracket and into the bottom pulley as shown.
Step 9
Distek, Inc. Service Note: 2500x-1090 Page 5 of 6
121 North Center Drive
North Brunswick, NJ 08902 USA
P: 732-422-7585 F: 732-422-7310 TOLL FREE: 888-234-7835
This document contains confidential and proprietary information which is not to be disclosed to others for any purpose nor used for manufacturing
purposed with written permission from Distek, Inc.
Service Note
Step 10
Once the spindle sleeve is reinserted, check that the drive belt goes around each pulley as
shown.
Step 10
Step 11
Position the bottom pulley so that it lines up with motor pulley and the drive belt is horizontally
level between pulleys. Secure the pulley in place by tightening the two set screws.
Step 11
Be sure that the set
screws on the pulley are
lined up with the two
flats on the spindle
sleeve as shown.
Distek, Inc. Service Note: 2500x-1090 Page 6 of 6
121 North Center Drive
North Brunswick, NJ 08902 USA
P: 732-422-7585 F: 732-422-7310 TOLL FREE: 888-234-7835
This document contains confidential and proprietary information which is not to be disclosed to others for any purpose nor used for manufacturing
purposed with written permission from Distek, Inc.
Service Note
Step 12
Reinstall the spindle drive belt (long belt).
Step 13
Check and adjust the belt tension (refer to Drive Belt Tension in the operation manual).
Step 14
Once the adjustment of belt tension is completed, reinstall the drive head cover.
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