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Farm Machinery
Classic Machinery
MF 220 digger slew actuator seals.
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<blockquote data-quote="jf850" data-source="post: 7006297" data-attributes="member: 7558"><p>I have a 220 back actor on an MF 50 . It must be 15 years ago that it started leaking oil out of the top of the slew motor , where the outside "pot " turns .</p><p>I asked an MF expert , eg a man who had a similar machine for years .</p><p>He told me that what happens is , </p><p>Dirt get down into that round groove , sits on top of the seal . It then wears the steel at that point , as well as wearing the seal to a certain degree. </p><p>The cure . There is a ring of Allen headed bolts holding the top ring on the pot . Open out all the studs , then , there are two threaded holes in the ring , but no threads for them to screw into in the bottom section . So , by screwing in these bolts , you are rising the top ring off . </p><p>The top ring is probably 2 1/2 to 3 inches thick. You will see the seal in a groove . Take it to an engineering place and they will machine a new groove in it , lower down , to take a new seal , that will.be sitting against a fresh undamaged bit of the inner shaft . Put a new seal in the old seal place as well . It will prevent dirt getting down again and damaging the new seal. From memory , the seal was a common seal , that the engineer had in stock himself .</p><p>Also , the slew pot should have a "Top hat " on it , which keeps the dirt out . I fitted a top hat when the new seal was put in and never had any trouble since .</p></blockquote><p></p>
[QUOTE="jf850, post: 7006297, member: 7558"] I have a 220 back actor on an MF 50 . It must be 15 years ago that it started leaking oil out of the top of the slew motor , where the outside "pot " turns . I asked an MF expert , eg a man who had a similar machine for years . He told me that what happens is , Dirt get down into that round groove , sits on top of the seal . It then wears the steel at that point , as well as wearing the seal to a certain degree. The cure . There is a ring of Allen headed bolts holding the top ring on the pot . Open out all the studs , then , there are two threaded holes in the ring , but no threads for them to screw into in the bottom section . So , by screwing in these bolts , you are rising the top ring off . The top ring is probably 2 1/2 to 3 inches thick. You will see the seal in a groove . Take it to an engineering place and they will machine a new groove in it , lower down , to take a new seal , that will.be sitting against a fresh undamaged bit of the inner shaft . Put a new seal in the old seal place as well . It will prevent dirt getting down again and damaging the new seal. From memory , the seal was a common seal , that the engineer had in stock himself . Also , the slew pot should have a "Top hat " on it , which keeps the dirt out . I fitted a top hat when the new seal was put in and never had any trouble since . [/QUOTE]
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MF 220 digger slew actuator seals.
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