1968 ATCO B 23 mower

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Gil Hassin
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1968 ATCO B 23 mower

Greetings from Sydney Australia, I've recently acquired the above mower in reasonably good condition, replaced spark plug, broken fuel cock and gave it an oil change, ticks like a clock, quiet smooth etc.  Rotating blade is am little on the rough side so planning to do a little work on it using Valve lapping paste running the blades slowly in reverse.

Problem 1 - I've removed the chains hoping to be able to rotate the blade backwards but can't work out how to take the sprocket off. It's either on a spline or reverse thread, not sure which but if someone out there can advise me I'll be eternally grateful.

Would also be handy to have a service and workshop manual for it to help the cause, I'm trying to give it a full restoration, paintwork is reasonable but it would sure look so much better with a bare metal respray in 2 Pak paint. Amazing but the grass catcher doesn't even have a dent on it, I'll be looking for a photo of the original decals and transfers to apply when

Hope to hear from willing helpers.

Regards to all,
Gil

 

gtc
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Making duplicate posts is not

Making duplicate posts is not considered good forum etiquette. We can all see new posts regardless of what section (forum) you put them in.

wristpin
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The sprocket is retained by a

The sprocket is retained by a splined sleeve. Look down the recent posts for one by woollyhales asking a similar question and look at the images that I posted.

The process that you describe for cleaning up the blades is known as back lapping.  A lot has been written and debated on this forum and others and without opening up  another debate I will just make a couple of observations.

Valve grinding paste is oil based an it’s difficult to remove every trace - not desirable.

Back lapping paste is water based and easily washed off 

The process itself is a maintenance operation for blades that are in good condition, not a recovery operation for damaged or neglected blades.

Back lapping only works properly on blades that have previously been relief ground. That is that a small amount of metal has been ground off the back edge of the blade creating a space to hold the paste. Without that space the first reverse rotation of the cylinder tends to wipe all the past away from where it’s needed.

’nuff said!

 

olcadmin
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I have removed the other

I have removed the original (duplicate) post before it attracted any answers.

OLC Admin

hortimech
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Isn't the B23 what we used to

Isn't the B23 what we used to call the deluxe and later became the commodore ?

If so, the cylinder sprocket is screwed on with a left hand thread.

As for backlapping, I agree with everything Wristpin said, if your cylinder is sharp it will keep it sharp, if it isn't sharp, then do not waste your time.

 

wristpin
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Yes, the pre Commodore DeLuxe

Yes, the pre Commodore DeLuxe - brain fade!

As said, left hand thread

https://www.dropbox.com/s/00amlokmmxselmm/Atco%20B230001.pdf?dl=0

Gil Hassin
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Thanks for that info, I was

Thanks for that info, I was confused as to which section in which to put my post, it was my first post on the site, my apologies.

 

Gil Hassin
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Thank you for your reply,

Thank you for your reply, good advice noted.