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Steering on D3B - How does it work?


 
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steeringidiot
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PostPosted: Wed Mar 28, 2007 2:26 pm    Post subject: Steering on D3B - How does it work? Reply to specific post Reply with quote

Need some clarification on how the steering on a CAT D3B works.

I understand that when you press a steering clutch pedal you activate the steering clutch valve. When the valve is open hydraulic fluid flows to the piston inside the steering clutch case. This pushes on the rod which pushes the arm of the yoke. When this happens it "opens" the clutch pack. WHY does this cause the clutch pack to disengage???? Also, I know that there is a "stop" bolt that is to be set at a certain distance from the sideway of the case. What happens is the clutch pack opens WIDER that what is specified???

These probably sound like silly questions, but I'm finding I'm wearing brake bands like crazy and I'm not sure WHY? Dozer is only used around my property and had it for 5 years and went thru 3 bands that had to be relined. Seems like alot.

Thanks to all who respond!!!

 

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Roy Suomi
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PostPosted: Wed Mar 28, 2007 3:21 pm    Post subject: Re: Steering on D3B - How does it work? Reply to specific post Reply with quote

Does the machine steer abruptly when you push the steer pedal down..It shouldn't ..It should steer nice and smoothly..Unless you stomp on the pedal..There is an adjustment on the cylinders inside the clutch housing..I'm wondering if there's too much slack in that adjustment...Spring tension applies the clutches..Pushing in on the yoke disengages the clutch plates..To compensate for loose clutch adjustment you might be too tight on the brake band, causing premature wear of band lining..

 
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Bob/Ont
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PostPosted: Thu Mar 29, 2007 2:21 pm    Post subject: Re: Steering on D3B - How does it work? Reply to specific post Reply with quote

Have you been wearing out the same one 3 times?
Later Bob

 
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steeringidiot
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PostPosted: Thu Mar 29, 2007 2:48 pm    Post subject: Re: Steering on D3B - How does it work? Reply to specific post Reply with quote

No. I changed the one on the LEFT side. Wasn't going to pull that clutch since I just changed it and the brake band 3yrs ago. But did it anyway. Found the brake worn down to the rivets. The one on the RIGHT side hasn't been changed since I owned the machine. So really only the LEFT side that concerns me.



 

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Bob Plumadore
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PostPosted: Thu Mar 29, 2007 5:22 pm    Post subject: Re: Steering on D3B - How does it work? Reply to specific post Reply with quote

you may have a linkage problem, maybe it nees a little lube. if the pedal is keeping the band to close to the drum that will accelerate wear.

 
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Bob/Ont
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PostPosted: Thu Mar 29, 2007 5:30 pm    Post subject: Re: Steering on D3B - How does it work? Reply to specific post Reply with quote

If you have dry clutches and adjust them too tight they will get hot and lock up. They have a support bolt up through the bottom of the case that holds the band off the drum. Unlock it and tighten up tight and then backoff 1 turn and lock it up. If you have oil clutches they may have the control linkage rods adjusted too long and to get peddal height right the bands have to be adjusted too tight. To correct this adjust band tight then back off 1 1/2 turns. Take pin out of linkage and adjust rod end so you can just get it in while pulling rod back and pushing forward on lever down into the clutch case. The machine should steer with a light toe pressure on the peddals. If you have to really get on the peddal to steer the clutch release valve needs a new ball bearing in the end of the valve spool.
Later Bob

 
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