H-3 Dozer lower output shaft seals. with PIC

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   I got the turning clutches rebuilt and the fluids changed.  Now I found out why the final drive housing oil was slow low.  Both lower output shaft seals leak.  The ones right behind the drive sprocket that go to the big bull gear in the final drive.  Is it possible to change these seals without splitting the track.  It looks like I could just remove the bolts holding the sprocket to the shaft flange and tip the sprocket out with the track still on it.  It would probably be pretty heavy but I wouldn't have to split the track.

Sound plausible?

Edited by warddc - 28 Apr 2013 at 3:49pm

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warddc Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 26 Nov 2012 Points: 49	Post Options Post Reply Quote warddc Report Post Thanks(0) Quote Reply Topic: H-3 Dozer lower output shaft seals. with PIC Posted: 28 Apr 2013 at 3:47pm
	I got the turning clutches rebuilt and the fluids changed. Now I found out why the final drive housing oil was slow low. Both lower output shaft seals leak. The ones right behind the drive sprocket that go to the big bull gear in the final drive. Is it possible to change these seals without splitting the track. It looks like I could just remove the bolts holding the sprocket to the shaft flange and tip the sprocket out with the track still on it. It would probably be pretty heavy but I wouldn't have to split the track. Sound plausible? Edited by warddc - 28 Apr 2013 at 3:49pm
	1962 H-3 Dozer

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Coke-in-MN Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Afton MN Points: 41484	Post Options Post Reply Quote Coke-in-MN Report Post Thanks(0) Quote Reply Posted: 28 Apr 2013 at 5:09pm
	Yes it can be done that way - in a way it's more work but the track also can be removed without splitting if you can back off adjuster far enough to allow track to be worked over everything . Check the axle for wear at seal surface - you might have to go to a speedy sleeve and a oversize seal to get it to hold oil. You will need room to remove the lower part of housing to get at retainers and also need to get at bearings and snap rings to remove axle.
	Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful."

Ages Cat Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 Sep 2009 Location: Hutchinson, MN Points: 688	Post Options Post Reply Quote Ages Cat Report Post Thanks(0) Quote Reply Posted: 28 Apr 2013 at 6:21pm
	If you change them, be advised that there are several upgrades to that seal installation. I thought that we could simply replace the seal with a like kind single lipped seal. We had to replace them a second time as the seal essentially self destructed. I believe the kit that we received used a spacer ring between two separate seals. The original was a single dual lipped seal. We split the tracks.

warddc Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 26 Nov 2012 Points: 49	Post Options Post Reply Quote warddc Report Post Thanks(0) Quote Reply Posted: 29 Apr 2013 at 2:00pm
	Interesting. The book I have for the H-3 shows a four lipped seal (three pointing outboard and one inboard) and a special tool the get the seal on. I wonder if the new seal method is available and easier to install?
	1962 H-3 Dozer