Smart questions
Smart answers
Smart people
Join Eng-Tips Forums

Member Login

Remember Me
Forgot Password?
Join Us!

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips now!
  • 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!

Join Eng-Tips
*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.
Jobs from Indeed

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

Oil Cleanliness in Industrial Gearboxes

GregPerry (Mechanical) (OP)
11 Jan 02 8:01
I am looking for as much information as possible on oil cleanliness levels, oil analysis interpretation, etc... Applicable to industrial gearboxes and bearings.

mewhg (Mechanical)
14 May 02 9:10

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.


gunnarhole (Mechanical)
5 Jul 02 11:40

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.


icw (Civil/Environmental)
16 Jul 02 23:05
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.
GregPerry (Mechanical) (OP)
17 Jul 02 10:38

Yes please. Send it to

Thank you.

mewhg (Mechanical)
12 Aug 02 8:41

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

ncravi (Mechanical)
30 Sep 02 5:15
can you send me the paper please?
You can mail it to
ferreiro (Mechanical)
30 Sep 02 13:20
Hi icw please would you send it to me.
Best Robert
icw (Civil/Environmental)
30 Sep 02 22:18
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.
ferreiro (Mechanical)
23 Dec 02 14:13
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
bosha (Industrial)
29 Dec 02 10:33
icw, If possible I would also like to recieve your paper on oil contamination
Thanks Bob

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!

Back To Forum

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