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!
  • Students Click Here

*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


3304 cat diesel generator set

3304 cat diesel generator set

3304 cat diesel generator set

The control rod at 1800rpms is not steady, it looks like it's "jiggling" and once in a while it will surge as to require more fuel; but no extra load is on it.. any help?? it's on line but aggrevating..

RE: 3304 cat diesel generator set

The first thing to check is the fuel, and fuel system. Look for quality of the fuel lines and hoses, for air leaks, water and dirt in the fuel, fuel filter and that sort of thing. Look for parasitic loading from things like a generator bearing going bad. And are you sure there is no electrical load causing the problems? How do you know there is no extra loads on it? If the loads are motors then how do you know they aren't being loaded? What is it powering?

RE: 3304 cat diesel generator set

Also, check the governor. I assume that the governor is mechanical? Or perhaps hydraulic?

Whatever it is, it is essential that the rack and related internal linkage moves freely and without stiction.

Check the lubrication level in the governor. A worn governor or even a sticking plunger can give similar symptoms.


RE: 3304 cat diesel generator set

Thanks for the tips, I'll check on the fuel and hoses etc.. as for the loads, I was comparing the two generators. They are rotated daily and the #1 gen is smooth as silk with the same loading consumers. Both are identical with woodward controls etc.. didn't know if the fuel and other checks you mentioned are good; is there an adjustment out of sync in the control box that needs tweaking..?? thanks for any more tips.. i appreciate it.. the gen with this issue will run all day on line, but the occasional difference in rpm's (@1730 to 1840's) keeps occurring then it settles back to normal at 1799-1800 rpms.. thanks

RE: 3304 cat diesel generator set


Hope the linky works. File is theory of operation and troubleshooting guide for Woodward UG governor. Search terms were "Woodward UG governor symptoms".

"Schiefgehen wird, was schiefgehen kann" - das Murphygesetz

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!


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