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Charlie175 
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Joined: 11 Sep 2009
Location: Shenandoah, VA
Points: 6368
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 Topic: 720 drive shaft
Posted: 25 Apr 2013 at 12:45pm |
My brothers 720 vibrates in the back and he thinks the driveshaft is bent (It does have a wobble to it). He had replaced the flex coupling when he had it apart, so that should be ok. Any other ideas?
Any other way to remove it without moving the engine?
Any used ones out there? I had heard at one time that other brands (Other than Powermax) might match up as it was a common shaft
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Charlie
'48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD
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aras
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Joined: 28 Jul 2011
Location: Weston, WI
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Posted: 25 Apr 2013 at 2:34pm |
I took mine out and straightened it in a press. I was able to remove it after the cover on the middle section is removed on the topside.
The coupler needs to be checked for runnout when installed on the engine
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Charlie175
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Posted: 25 Apr 2013 at 2:44pm |
Can you explain what you mean by runout?
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Charlie
'48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD
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aras
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Posted: 25 Apr 2013 at 3:28pm |
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The shaft must be concentric to the engine pulley.... I'll see if I can find the service manual
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RichinWis
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Location: Deforest Wis
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Posted: 25 Apr 2013 at 4:36pm |
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Runout is how much wobble the shaft has, in laymans terms if the shaft is bent or tweaked it will wobble
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DiyDave
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Location: Gambrills, MD
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Posted: 25 Apr 2013 at 5:58pm |
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Charlie, also check that it was re-assembled correctly. I always mark a shaft, with paint, on each part, and U joint. If the U joints are out of phase, that will vibrate like crazy.
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Charlie175
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Location: Shenandoah, VA
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Posted: 26 Apr 2013 at 7:10am |
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Charlie
'48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD
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