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Classic Machinery
MF 40 digger slew motor
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<blockquote data-quote="Captain Sensible" data-source="post: 7676374" data-attributes="member: 107484"><p>Hi Andy,</p><p></p><p>Hope the attached parts diagrams are of help. There are two types of slew motor fitted to a MF 40, depending on its age / serial no. Both are shown in the attached pdf doc. </p><p></p><p>I'm afraid you'll have to read across from one page to the next to work out how many of each component there are or which bit is which number on the diagrams ........ The Parts Book wouldn't flatten enough to scan properly.</p><p></p><p>As to whether it's the Slew Motor or the Spool Valve, will it actually slew under power? If so, it isn't the slew motor seals ..... if they are gone you won't be able to slew the digger arm with any force at all. Instead it is likely to be a Spool Valve problem. </p><p></p><p>I seem to remember that the 'Slew' spool valve slice has special pressure / cross-line relief valves in it to prevent the valve block being damaged due to the digger arm continuing to slew under its own momentum. Chances are something there has gone wrong. To discount this, try swapping the slew motor pipes onto a different valve slice & see if you still have the problem ....... but treat it gently & don't use it like that in anger (without the special relief valve in-circuit). If your problem goes away, it's the valve not the motor.</p><p></p><p>If the problem remains then you'll need to dismantle the motor. You MAY be able to get seals either from P.V. Dobson or Kellands Plant Sales in Bridgewater .... or from somewhere closer to home.</p><p></p><p>Good Luck!</p><p></p><p>Andy</p></blockquote><p></p>
[QUOTE="Captain Sensible, post: 7676374, member: 107484"] Hi Andy, Hope the attached parts diagrams are of help. There are two types of slew motor fitted to a MF 40, depending on its age / serial no. Both are shown in the attached pdf doc. I'm afraid you'll have to read across from one page to the next to work out how many of each component there are or which bit is which number on the diagrams ........ The Parts Book wouldn't flatten enough to scan properly. As to whether it's the Slew Motor or the Spool Valve, will it actually slew under power? If so, it isn't the slew motor seals ..... if they are gone you won't be able to slew the digger arm with any force at all. Instead it is likely to be a Spool Valve problem. I seem to remember that the 'Slew' spool valve slice has special pressure / cross-line relief valves in it to prevent the valve block being damaged due to the digger arm continuing to slew under its own momentum. Chances are something there has gone wrong. To discount this, try swapping the slew motor pipes onto a different valve slice & see if you still have the problem ....... but treat it gently & don't use it like that in anger (without the special relief valve in-circuit). If your problem goes away, it's the valve not the motor. If the problem remains then you'll need to dismantle the motor. You MAY be able to get seals either from P.V. Dobson or Kellands Plant Sales in Bridgewater .... or from somewhere closer to home. Good Luck! Andy [/QUOTE]
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MF 40 digger slew motor
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