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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

How does the steering actual occur on a dozer.

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marvin

11-10-2003 13:10:14




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I have driven a few dozers over the years starting with a T9 and then a D6 with a cable blade and then a 450. The T9 and the D6 had two steering levers and brake pedals for each side. THe 450 only had two brake pedals. So I assume that the newer dozers due not have the steering clutches like the T9 adn the D6 did. I assume that the 450 is steered just applying a brake to one side of the rear differential so that one side gets the power and the other side gets pushed around. Is this correct? On the T9 and D6 are there actual clutches that disengage for steering? Are those clutches the same size as the main clutch for applying power from the engine to the transmission?

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Bob/Ont

11-10-2003 14:23:09




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 Re: How does the steering actual occur on a dozer. in reply to marvin, 11-10-2003 13:10:14  
Marvin, the 450 is likely just a pedal steer like a lot of track loaders have been for the last 30 yrs. Free's up the hands for useing the hyd controls. The first part of the peddal travel releases the clutch and the last part applies the brake, if needed to turn. The steering clutches are usually multi disc and about 3" thick. They have to handle a lot more torque since they are farther down the powertrain than the flywheel clutch, the brakes are usually bands wrapped around the outer drum of the clutch. Some IH tractors had a set of planetaries on each side of the bevelgear and a big disc that was held with a chaliper to make it drive and released to steer. The TD 24 and 25 had two sets of planetaries on each side and 3 disc's. The back end of them was actually a two speed powershift trans. The steering levers where pushed forward for high and back to the middle for low, all the way back for brake and no drive. These machines could have power to both tracks while turning gradually and lessen the chance of getting stuck in soft ground as opposed to a machine with steering clutches. Some new machines have Diff Steer even more complicated than the IH two speed steering and they can counter rotate in neutral. Some smaller machines have Hystat or Hydraulic drive, they have power to both tracks on a turn and most can counter rotate aswell. Later Bob

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marvin

11-10-2003 15:18:23




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 Re: Re: How does the steering actual occur on a do in reply to Bob/Ont, 11-10-2003 14:23:09  
Bob; Thanks for the input. It sounds like a real design challenge for the engineers that get to work on this and also for the mechanics that need to support this. How long do the steeering clutches last and the brakes on an hour bases? I realize this going to vary alot depending on whether they are working in a pit pushing rock or just pulling a one way disk in a wheat field. Marvin



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Bob/Ont

11-10-2003 15:57:52




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 Re: Re: Re: How does the steering actual occur on in reply to marvin, 11-10-2003 15:18:23  
You would need to get that info from the owners of some machines. The ones that run in oil(wet clutches) last longer than dry ones. The most of the time I pull clutches is to do other work. Reseal or replace final drive pinions or change failed bevelgear shaft bearings. I always check them when they are out but rarely do anything to them. Working in a wheat field can be harder on a tractor than pushing dirt. Droping a plow and pulling it a mile non stop is harder on bevelgear bearings than short cycles of dozing then backing up. Later Bob

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