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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: Cat D3 Steering Problem

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03-31-2014 18:41:38

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I've been through similar variations of these problems. These are dry clutches and don't always take well to aging. With rust and deterioration the clutches sometimes don't fully release and when you step really hard on the pedal the discs groan from too much friction. I've also had it where proper clutch pressure does not fully return due to a tiny spring being broken in the steering valve. There is a small pipe plug on each side of the outer housing facing the tracks. If you attach a hose with a pressure gauge there capable of 300 lbs start the machine and depress the pedal on the same side as the hook-up, you must have a minimum of 220 lbs for the clutches to release and must return to 0 lbs as soon as you take the foot off the pedal.

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04-02-2014 19:13:20

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 Re: Cat D3 Steering Problem in reply to EricB, 03-31-2014 18:41:38  
I checked the pressure on both sides. Both sides are the same, as soon as i push pedal down gauge goes to over 250 psi and back to 0 psi when I let off.

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04-01-2014 05:12:09

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 Re: Cat D3 Steering Problem in reply to EricB, 03-31-2014 18:41:38  
Is the loud groan a problem that needs to be fixed?

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04-01-2014 18:48:17

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 Re: Cat D3 Steering Problem in reply to Tweeter, 04-01-2014 05:12:09  
The loud groan I'm referring to is if the track is held still by the brake pedal fully depressed while in gear and a bit of throttle, if the track is partially moving the groaning can be from the brakes also. The noise from the steering clutches doesn't have to be fixed if the machine pulls and brakes properly but will make them wear prematurely as the discs are not fully released. With engine running depress both pedals all the way and hold, then put it in first gear forward with a bit of throttle - if the machine tries to move forward one or both clutches are not fully releasing. If you have to press hard to keep it from moving this is when you may hear the groaning and often feel a bit of vibration coming from the pedal with the slippage. Hook up the pressure gage to that side as I described in the previous email. With engine running push the pedal 10 or more times while watching the should go to 250 lbs or more when cold and as soon as the pedal comes up all the way it should go back to 0 lbs. If it does every time the steering valve works fine.

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