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ML7 Tight spindle

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Tony Wagstaff28/12/2010 10:26:35
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3 forum posts
Hi guys,
 
I sent yesterday replacing the headstock drive belt on my ML7.
 
On refitting the the bearing caps, I found the spindle would not turn - even with all the belt tension released.
 
I stripped down all of the bearing caps again and removed the belt. When lowering the spindle back into the bearings. I noticed that as it started to enter the rear bearing, the flange at the back end of the spindle was binding against the bearing housing.
 
Nothing has been touched during the changing of the belt, the only screws that were undone were the 4 in the bearing caps. I even made sure that the laminated shims stayed in the same place - even the same way round!
 
Can anyone offer me any guidance to set the head correctly as I am getting frustrated now!
 
Cheers
 
Tony 
Nicholas Farr28/12/2010 11:26:48
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3988 forum posts
1799 photos
Hi Tony, I'm not familiar with the ML7, but Mark Frampton delt with changing the belts in MEW170 &171. Reinstating the spindle was covered in the 171 issue.
 
Regards Nick.
KWIL28/12/2010 12:50:23
3681 forum posts
70 photos
If you simply removed the spindle, without touching the position of any of the spacers etc on the spindle, it must slip back into position. Have you checked that the thrust washer of the ball thrust bearing has not moved?
 
K
_Paul_28/12/2010 15:24:34
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543 forum posts
31 photos
Tony,
 
I had to change the backgear in my ML7 about a year ago this too means taking out the spindle.
I found like you that on replacement it was tight to turn, I meticulously stripped it down a few times  finding nothing wrong.
 
The ML7 bearing caps dont have particularly positive location so what I did in the end when refitting the caps was to line up as best as possible by eye and load them with thick (slideway oil) then "feel" them into position took a few goes but eventually mine slackened off somewhat after doing this and adjusting the endfoat slightly.
 
That said mine then took a couple of hours running to return to it's former "easy hand turn" state.
 
 
Regards
 
Paul Floyd
 
 
 
John Olsen28/12/2010 22:20:00
1294 forum posts
108 photos
1 articles
The right hand cap on mine will almost go in the wrong way around, which could be a source of problems.
 
On the left hand side there is an adjustment for end float, if this has ended up too tight it might cause some binding. There is a grub screw through a screwed collar. (There should be a little brass pad where it bears on the thread.) I always slacken this back a little before dismantling, I think that it helps with both disassembly and reassembly. Mind you, last time I forgot to readjust the endfloat afterwards, and only realised when I was screwcutting a part, luckily before I got too far.
 
regards
John
Gordon A29/12/2010 09:08:25
157 forum posts
4 photos
Hi Tony,
 
You could try ringing Myford on + 44 (0)1159 254 222. They have given me advice over the phone in the past.

Gordon.
Ian S C29/12/2010 11:59:21
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7468 forum posts
230 photos
Itwould be a good situation for link type belts for future changes, once you'v got the mandrel settled in,leave it, thelink belt, what ever make saves a lot of time, and sweat. Ian S C Sorry not a Myford type so can't help with your bearing problem.
John Stevenson29/12/2010 12:02:31
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5068 forum posts
3 photos
Posted by Gordon A on 29/12/2010 09:08:25:
Hi Tony,
 
You could try ringing Myford on + 44 (0)1159 254 222. They have given me advice over the phone in the past.

Gordon.

 It's Christmas !!

Alan Worland30/12/2010 20:54:49
247 forum posts
21 photos
Whwn I had the spindle out, I backed off the end float adjustment before removal, then on assy I lowered the spindle and caps in position with the cap screws just nipping, I then tightened the end float adjuster so that it would 'align' the rear bearing.
Once the caps screws were done up I then set the end float - seemed to work ok

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