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Farm Machinery
Classic Machinery
MF 40 digger slew motor
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<blockquote data-quote="Captain Sensible" data-source="post: 8122267" data-attributes="member: 107484"><p>Hi Simon,</p><p>haven't time to dig out the diagram at present, but will try to do so over the next 24 hours. Unsure exactly how it's all configured, BUT if it's anything like the MF50 series (50, 50B, 50D, etc) the bottom kingpost bearing is a specialist ball-bearing whose outer race has a curved / convex outer surface. This fits into a concave-shaped recess in the (cast / forged) bearing support housing, which then bolts to the main (kingpost) support casting. The bottom end of the kingpost goes through the bearing (from top to bottom) & is secured by a couple of locking nuts. Sounds complex but it isn't too bad ..... but as the top end of the kingpost passes through an upper bearing & then attaches to the Slew Motor, you do have to be very careful that you don't accidentally get the kingpost out of line when replacing the lower bearing, and thereby damage /bend the insides of the Slew Motor.</p><p></p><p>This is how I did the job. Ideally fit a wide (ditching) bucket to the digger & extend the arm right out behind the machine & lower it down. Support the dipper arm, make sure it can't topple over side-to-side, & remove it from the kingpost unit. There should be enough spare length in the hyd hoses so that you can drive forward enough to detach the dipper arm & give you enough room to work. You now need to support the kingpost, <strong>keeping it square & in-line</strong>, so it doesn't drop down or move side-to-side while you replace the bottom bearing. This is best done using lifting equipment because you need to work freely underneath the kingpost. You can then replace the bearing, refit the bearing housing & refit the dipper arm. If you want you can remove the Slew Motor from the Kingpost before doing all this, but it isn't strictly necessary .... it's only splined into the Kingpost & retained by a couple of bolts ...... That way you can also check out the Kingpost top bearing, but it's the lower one which takes both horizontal & vertical loading & so usually fails first.</p><p></p><p>Hope this helps</p></blockquote><p></p>
[QUOTE="Captain Sensible, post: 8122267, member: 107484"] Hi Simon, haven't time to dig out the diagram at present, but will try to do so over the next 24 hours. Unsure exactly how it's all configured, BUT if it's anything like the MF50 series (50, 50B, 50D, etc) the bottom kingpost bearing is a specialist ball-bearing whose outer race has a curved / convex outer surface. This fits into a concave-shaped recess in the (cast / forged) bearing support housing, which then bolts to the main (kingpost) support casting. The bottom end of the kingpost goes through the bearing (from top to bottom) & is secured by a couple of locking nuts. Sounds complex but it isn't too bad ..... but as the top end of the kingpost passes through an upper bearing & then attaches to the Slew Motor, you do have to be very careful that you don't accidentally get the kingpost out of line when replacing the lower bearing, and thereby damage /bend the insides of the Slew Motor. This is how I did the job. Ideally fit a wide (ditching) bucket to the digger & extend the arm right out behind the machine & lower it down. Support the dipper arm, make sure it can't topple over side-to-side, & remove it from the kingpost unit. There should be enough spare length in the hyd hoses so that you can drive forward enough to detach the dipper arm & give you enough room to work. You now need to support the kingpost, [B]keeping it square & in-line[/B], so it doesn't drop down or move side-to-side while you replace the bottom bearing. This is best done using lifting equipment because you need to work freely underneath the kingpost. You can then replace the bearing, refit the bearing housing & refit the dipper arm. If you want you can remove the Slew Motor from the Kingpost before doing all this, but it isn't strictly necessary .... it's only splined into the Kingpost & retained by a couple of bolts ...... That way you can also check out the Kingpost top bearing, but it's the lower one which takes both horizontal & vertical loading & so usually fails first. Hope this helps [/QUOTE]
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MF 40 digger slew motor
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