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690B Excavator


 
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Freddy
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Joined: 14 Jul 1998
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PostPosted: Wed Feb 06, 2013 4:56 pm    Post subject: 690B Excavator Reply to specific post Reply with quote

I am working on a 690B. The problem is the swing motor base vent is leaking hydraulic oil out of it when I swing the house. I replaced the swing motor seal and o-ring. It was a strange looking seal with two teflon looking lip seals. I leaks as much as it did before. I am wondering if any one of you have seen this? Could it be the swing brake leaking up instead of the motor leaking down? Same vent. I did not think it was the brake because if you are not moving the swing it doesn't leak. well it appears that way anyway. any one have an idea?
 
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Roy Suomi
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PostPosted: Thu Feb 07, 2013 3:38 pm    Post subject: Re: 690B Excavator Reply to specific post Reply with quote

Swing brake is spring applied and pressure released..So there ya go
 
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Freddy
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PostPosted: Thu Feb 07, 2013 5:21 pm    Post subject: Re: 690B Excavator Reply to specific post Reply with quote

Hydraulics unlock the brake, but its on all the time while running. Switch turns it off. it should leak all the time, by the book. JD said the seal i got from them was wrong. So i will change it again
 
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