Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Oil Cleanliness in Industrial Gearboxes

Oil Cleanliness in Industrial Gearboxes

Oil Cleanliness in Industrial Gearboxes

I am looking for as much information as possible on oil cleanliness levels, oil analysis interpretation, etc... Applicable to industrial gearboxes and bearings.


RE: Oil Cleanliness in Industrial Gearboxes


I used to work for a company that did a lot of work with Falk out of Milwaukee, WI.  The Falk standard for the two most common configurations of their gearboxes is as follows:

unfiltered splash lubricated: ISO 23/20/18
filtered with 40 micron wire filters: ISO 20/18/16

You can get a lot of information from the Pall corporation.  They make industrial oil filters and are experts in oil contamination.  Very helpful people and I'm sure they have a website.


RE: Oil Cleanliness in Industrial Gearboxes


ISO 4406 provides guidance in charcaterizing the cleanliness of lube oils.  It is based upon counting the number of particles in given size ranges (>4 um, >6 um, >14 um) in a one ml sample.  This methodology has been adapted for use by some equipment manufacturers.

NAS 1648(National Aerospace Standard)provides similar guidance but uses a single characterization number to describe the particle size count and distribution in a 100 ml sample.



RE: Oil Cleanliness in Industrial Gearboxes

Are you still looking for information?? I wrote a paper on this subject for a large Mining Group and will e-mail you a copy of this if you like.

RE: Oil Cleanliness in Industrial Gearboxes


I would be interested in reading your paper.  Thank you.



RE: Oil Cleanliness in Industrial Gearboxes

can you send me the paper please?
You can mail it to mcravi@rediffmail.com

RE: Oil Cleanliness in Industrial Gearboxes

Hi icw please would you send it to me.
Best Robert

RE: Oil Cleanliness in Industrial Gearboxes

Read with interest your comments on FALK giving ISO codes on splash and filtered systems.
Why would one run a splash lubricated box four times dirtier than a filtered box?
I've seen 1500 HP FALK  boxes (bearings) fail in two years which is the result of running a box at ISO 23/20/18 and once the oil reaches this level of contamination, no bearing will last....... ask any bearing manufacturer.
I think gearbox manufacturers forget their boxes run on bearings - have no doubt they only consider the gears.
Agree with your comments about PALL Corporation - a good source of information on contamination control.

RE: Oil Cleanliness in Industrial Gearboxes

Hi icw,
please would you send to me the report you did.I had a major computer failure and the people who did the repair thought i had backed up so when they cleanded and installed a new hard drive i lost all.
many thanks

RE: Oil Cleanliness in Industrial Gearboxes

icw, If possible I would also like to recieve your paper on oil contamination
Thanks Bob  bosha@pa.net

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close