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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Komatsu D20 Steering Clutches

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Grant Litts

11-27-2005 12:51:01




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I just bought a 1990 D20A dozer in very good condition. 1500 hours. When I park it and not use it for a week or two, the steering clutches won't release when I go to run it. The steering brakes work properly, but the clutches act like they're frozen. I have never had this problem with any other dry clutch dozer. Can anyone tell me what is causing this?? From what I have heard, this is a rather common problem with this model of dozer. Thanks!

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plumboy

11-30-2005 08:58:39




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 Re: Komatsu D20 Steering Clutches in reply to Grant Litts, 11-27-2005 12:51:01  
Do they unsieze after you run it,or is this a huge problem?Just curious cause I have been looking at these machines.



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GL

12-01-2005 05:05:11




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 Re: Komatsu D20 Steering Clutches in reply to plumboy, 11-30-2005 08:58:39  
They will eventually loosen up to the point where you can steer the machine, but it may or may not steer smoothly for quite a while. These are really nice machines, but this appears to be a widespread problem with them. I have owned bulldozers with dry clutches for over 40 years and I've never had this problem with any of the other brands. I am going to pull the clutches and see if there is something I can do to stop this from happening every time you park the machine for a week or two.

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JC WrightII

04-17-2006 19:49:54




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 Re: Komatsu D20 Steering Clutches in reply to GL, 12-01-2005 05:05:11  
Have you removed the drain plugs from the bottom of the clutch housings? The main gear lube may be leaking in. My left seal went out and the fluid caused the left side to burn out at 2200 hours. The left side would steer sometime and not others. My guess is that the fluid would dry/burn out after use and allow the clutches to grab again. I changed the clutches and seals, but now I remove the plugs at least once a week to let any fluid or water out.

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NC Wayne

11-27-2005 20:11:48




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 Re: Komatsu D20 Steering Clutches in reply to Grant Litts, 11-27-2005 12:51:01  
I'm not all that familiar with the D20A but typically with a dry steering clutch the discs will get moisture on them and weld theirselves together with rust. I don't know what Komatsu may have done differently on this machine to cause the problem but the best way to help get rid of moisture buildup in a housing is to make sure it's vented properly. It may be something as simple as pulling a drail plug in the bottom of the housing and simply leaving it out...although I wouldn't recomend this if you ever get it in the mud or the water since both will flow into the housing. Beyond that there's not really much I've ever heard of that you can do to prevent the problem short of firing the machine up and running it more often. Good luck.

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GL

11-28-2005 14:31:00




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 Re: Komatsu D20 Steering Clutches in reply to NC Wayne, 11-27-2005 20:11:48  
Thanks Wayne, I think you're probably on to the problem. I think I'll pull the clutches and see what shows up. Has anyone else done this and found the discs or the shafts rusted up??



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