HD6 clutch plate is stuck

Unlikely regular WD-40 will accomplish much. Now the new WD-40 is good stuff and could really help by spraying it every day. If you can get to the inspection hole with a 4# hammer and a long punch of some kind and hit the clutch assy. some good hard licks, you can probably break it loose. I've done quite a few this way over the years. If you depress the clutch while doing this it will relax the pressure and let things move better.

Tell us what worked. I always like to find a better way.

"You disengaged the clutch by bracing it" It is an over center clutch. Moving the clutch lever forward or backward it should snap into position and be completely engaged or completely disengaged. If it will not snap disengaged then it has come out of adjustment or you have 2 pieces of clutch material where one should be. No amount of spraying with whatever will help. Loosen the clutch adjustment on the pressure plate.

You will not be able to spray the clutch disk. It is covered by the pressure plate as seen from the access hole.

On the bright side

The clutch adjustment is done thru the access hole. Your machine has either a Rockford or Auburn pressure plate. The Rockford has a large threaded ring that is unlocked and rotated to adjust. The Auburn has a caselated ring that is unlocked and rotated to change position on inclined planes (cams)to adjust. The lock is traditionally painted white to identify it. If not paint it for next time. If you clean the pressure plate there may be adjusting instructions and/or identification stamped on the pressure plate.

Dozer you make it sound so simple!  I'll take another look and see if I can find the adjuster, pressure plate etc, but it may take a few days. I've got a half dozen projects going at the same time and the weather is cooperating to make hay.  Thanks I'll be back.

I am talking about the LH steering clutch.  Now I am confused about the adjustment dozer is talking about because when I referred to the online manual that I just found http://www.tractorparts.com/PDFs/HD5HD6STEERINGCLUTCH_wm.pdf on page 21 there is no part listed as an adjustment.

I thought you were talking about the master clutch.

You could loosed the screw band supporting under the stering cluch housing after pull the 2 stering cluch levers angaged the transmission after the master  cluch the stering cluch could turned free and defreeze the discs  togeter

I am looking at the diagram at http://www.tractorparts.com/PDFs/HD5HD6STEERINGCLUTCH_wm.pdf and can't find "the screw band supporting under the steering cluch housing".  When you say band do you mean brake band?  What if I just loosen both clutches and try going forward and backwards.  Won't that do the same thing?

I'm not sure what they did to the clutch when they fixed the brake.   Now I'm thinking that maybe they had the machine in a moist area so the clutch plates rusted together.

Anyway to break it free I tried loosening both track clutches and engaging the main clutch.  I figured that maybe I could break loose the LH clutch that way.  Sure enough after driving back and forth a few times it started slipping.  Now when I go forwards the clutch is not driving it enough to move the dozer but when I go backwards I have to put the brake on for the clutch to slip.  The LH Clutch gets warm when I let the main drive run without the dozer moving but I am guessing the plates are just rusty and thats why they are dragging.  What do you think?  Should I let the LH clutch plates drag until they wear so that they slip easier?

It sure helped looking at a diagram to understand how the clutches work before trying to fix it.