Crank bolt hex head size on 134?

I have the hex head bolt hidden under the front pump hub on my 63 2000 that I need to tighten. I was half expecting to find the slotted head that I would have no way to tighten so I reckon it ain't as bad as it could be. Last time I used a skinny adjustable wrench which is not one of my preferred fastener manipulation tools but it was all I had at the time. So I can take the correct wrench this time I need to know what size it may be.

If I can get the shaft out of the way I would go ahead and pull the hub and change the seal behind there. But the question is whether these are prone to needing a speedi-sleeve or if the hub OD is usually unworn from the seal after 50+ years. I haven't looked yet but who/where can one find a speedi-sleeve for these (p/n appreciated)?
 
(quoted from post at 12:32:46 11/18/15) I have the hex head bolt hidden under the front pump hub on my 63 2000 that I need to tighten. I was half expecting to find the slotted head that I would have no way to tighten so I reckon it ain't as bad as it could be. Last time I used a skinny adjustable wrench which is not one of my preferred fastener manipulation tools but it was all I had at the time. So I can take the correct wrench this time I need to know what size it may be.

If I can get the shaft out of the way I would go ahead and pull the hub and change the seal behind there. But the question is whether these are prone to needing a speedi-sleeve or if the hub OD is usually unworn from the seal after 50+ years. I haven't looked yet but who/where can one find a speedi-sleeve for these (p/n appreciated)?

To answer your question about the hex head size, I think its a 15/16". See my question from a year or so ago:

http://forums.yesterdaystractors.com/viewtopic.php?t=1102458&

You may very well need a speedi sleeve. I know mine was worn bad, but I found a good used one, I think it was from John Smith.

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