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D3B Steering

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Tom H

11-09-2002 13:23:53

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My CAT D3B is having some steering problems. When I depress the left steering pedal nothing happens. Right one works fine. When you depress both pedals half-way down the steering clutches disengage. The machine will stop rolling on level ground. So that, I suppose, is a good sign. My valves and clutches are working correctly??

Removed the seat to adjust brake bands. After tightening the Left nut as far as possible you can easily depress the left steering pedal. If my logic is correct this would indicate that my left brake band is shot on that side????? On right side you can take up some slack and cause the right pedal NOT to be able to be depressed which would tell me I have some band left there.

So in a nutshell, is what I need is a new brake band??? Is there anything else I should look for?? And, the big question is, how difficult is this to do??? I'm no mechanic but am willing to give it a try!!

All help is appreciated!!

Thanks
Tom

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Tom H

11-11-2002 06:07:21

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Re: D3B Steering in reply to Tom H, 11-09-2002 13:23:53

Folks;

Just want to THANK everybody for their input. Just one more question. Since I will be removing the clutches/brakes what should I be looking at to make sure the clutches are OK and don't need to be repaired etc??? As far as I can tell they were working correctly when the pedals were depressed half way down. THANKS to all for your help!

Tom

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Tom H

11-10-2002 10:00:31

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Re: D3B Steering in reply to Tom H, 11-09-2002 13:23:53

gatractorman;

Well you were right!! Took me about 3 hours but labelled everything and got the left clutch housing top off. Not as hard as I thought.

But what a surprise!! Had about 3/4 inches of water laying in the bottom of the compartment and everything coated in a thick gray wet sludge!!! What a mess!!!

Anyway, loosened the brake adjusting band as much as I could. Felt underneath the band and in my opinion I have absolutely NO brake lining at all. I don't know how thick a new band lining is supposed to be but all I felt was the "banding" material.

First is there any way to get that water out?? Maybe a nut to take out and drain it?? Do I have to remove the whole steering clutch just to replace the brake band? Can I just reline the band or do I need a whole new band and lining??Sorry for all the questions but trying to do it right and not screw things up too much??

Thanks for your help gatractorman!!

Tom

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Bob/Ont

11-10-2002 20:29:09

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Re: Re: D3B Steering in reply to Tom H, 11-10-2002 10:00:31

Tom you can get a lining kit or an exch band. There should be a large plug in the bottom to drain out the water. When you get it apart make sure the drum surface is not gouged up badly. Then when you get it together seal the cover with lots of RTV silicon. The cause of your problem I think is a brake linkage rod adjusted too long. and when you do adj the brake up to get the right peddal height the travel is all linkage play not band to drum clearance.
Later Bob

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Tom H

11-11-2002 06:09:24

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Re: Re: Re: D3B Steering in reply to Bob/Ont, 11-10-2002 20:29:09

Folks;

Tom

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Bob/Ont

11-11-2002 07:05:10

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Re: Re: Re: Re: D3B Steering in reply to Tom H, 11-11-2002 06:09:24

Tom, slide the clutch out of the drum and measure the width if the clutch pack. I can't give you the spec, but the dealer will have it, ask when you get your parts. Not to make a lot of work for you, but while you are there you might want to look under the other cover and see how much lining is left on that band too.
Later Bob

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Tom H

11-11-2002 10:03:50

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Re: Re: Re: Re: Re: D3B Steering in reply to Bob/Ont, 11-11-2002 07:05:10

Bob/Ont:

Thanks. I thought that would be something more I should be doing. I have the repair manuals. Can't seem to find the spec on the width. Will talk to dealer as you suggested.

Oh, you are right!! Will be taking out the right clutch soon as left one is done. Again, am a beginner and just want to be slooowww and steady with this one then will have the other one looked at!!

I'll keep ya posted as to progress.

THANKS
Tom

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gatractorman

11-10-2002 04:13:26

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Re: D3B Steering in reply to Tom H, 11-09-2002 13:23:53

When you tightened the left band did the pedal go all the way down like it still wasn't engaging brake band? Did this happen all the sudden, like one time you got brake then next time nothing? Anyway I'm thinking mabye a pin has fell out and not letting band engage, usually bands and clutches on both sides will wear together, meaning if you have adjustment on the right there still should be some on the left, unless someone has replaced only one side, and your not the kind of operator that turns only to one side, I've never replaced bands on a D3 so I cant tell you any details about it, but they dont look to be any harder than anything else. Bob/Ont has been a great help to me on Cat stuff he'll probably be along shortly.

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Tom H.

11-10-2002 04:34:01

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Re: Re: D3B Steering in reply to gatractorman, 11-10-2002 04:13:26

gatractorman;

I wouldn't say this happened all at once. When I bought the tractor the guy who sold it to me told me that steering left was a little slow. So he showed me and it was. Have adjusted the left side 2 times since I had it. Now when I say the pedal goes down, it does hit the floor. But you can feel some resistance due to the linkages etc.

Regarding turining. You're right don't always turn to one side but am working in somewhat cramped areas, so unfortunately do a lot of "tight turns". I know this wears them like crazy but can't avoid it.

Thanks for getting back to me.
Tom

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gatractorman

11-10-2002 04:54:02

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Re: Re: Re: D3B Steering in reply to Tom H., 11-10-2002 04:34:01

OK, that does sound more like a brake band now, dont worry much about the "tight turns" actually a sweeping turn is harder on bands than a tight one, a tight turn has the band locked to the drum, a sweeping turn allows the drum to slip somewhat inside the band, but there again bands are tough and will last a long time no matter how its used, as long as its kept adjusted properly.

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spyder

11-10-2002 13:43:28

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Re: Re: Re: Re: D3B Steering in reply to gatractorman, 11-10-2002 04:54:02

To drain the water out, theres a 1/2 inch threaded bolt that comes up through the bottom of each steering clutch case to help support and prevent the brake band from excessive wear on the top of the band. Removing this bolt will allow most of the water to drain. To replace the brake band, the steering clutch will have to be removed. The hardest part of the job is just getting to the top of the steering clutch housing. To adjust the bottom 1/2" threaded bolt, adjust the band adjuster up tight, then turn 1/2" threaded bolt till snug, then back off 1/2 a turn and lock in place. Now readjust the band adjuster. Good Luck.....

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