OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Walk Behind Lawn Mower Frames Reel Lawn Mowers, Atco & Villiers etc. Help with Atco Clutch

that's what i want to know old mate,

If you are fitting it like that of course it will come off it needs a nut to hold it on and I'm not seeing any thread there. Sprockets are either splined,tapered or keyed and held in place with a nut as per the exploded drawing

it is a threaded sprocket same as reel sprocket (bottom front),tightens clockwise,not enough length on shaft for a nut,

Hello gml

This should be your machine here:-
http://www.oldlawnmowerclub.co.uk/forum/atco-deluxe-information

Hope this helps.
------------------------
Jack

Where are you gml, I have 620 Loctite here, that'l fix it

Hi GML,

I don't think your missing anything, the lower hole is probably where the bearing would mount on for another model or with a different engine fitted that would have a height difference altering the angle of the shaft.

Have you tried tightening up the sprocket then with a block of wood against it give it a hit with a hammer to nudge it up tight.

Just thinking about this quoted previously " how does the sprocket on the crankshaft stay on!! if i turn everything by hand (machine elevated)the sprocket just undoes with the movement" I'm just wondering what you are rotating by hand, if you rotate the blades it will undo the sprocket, if you rotate the shaft out of the clutch it should tighten the sprocket. Could this be what is going on?

Hi Norm

I think GML did ask that, and you are quite right. The top sprocket is driven
by a shaft that turns clockwise from the LH side. This means that it would
always tighten a RH thread on the output shaft.

This is not the same for the reel. The reel would require a LH thread
because it is driven by the top sprocket.

I'm hoping GML will clarify what the issue actually is. Is it:
- the primary, plate clutch does not work?
- the top sprocket is out of alignment?
- the top sprocket won't fit the shaft?

The extra cut-out in the frame is - I think - a red herring here.
I cannot see what function it could have on this B23 model...

-------------------
Jack

last night i removed all the drive chains and sprocket's will post again when i go through it all,how much cork should be on clutch plate?,,.. correct sprocket,if i tighten it too much it lock's everything up,as for the clutch, well i will let you know soon thank you all for the help,

I would think that the sprocket would tighten on to the shoulder of the shaft, there should be clearance. In the link that Jack supplied you can clearly see in the last pic that the shaft has some thread protruding past the sprocket once fitted up



I feel your shaft needs to come through the bearing some more, if you have it apart are you able to post a pic of the end of the shaft where the sprocket screws up. I want to see the thread going all the way up to the shoulder.

Don't worry about the clutch, that is a separate issue for later, get the sprockets working first and as Paul says the sprocket should come up against a shoulder and be clear of the bearing. Hold a piece of string across the face of the lower sprocket and see what the alignment is like to the upper sprocket, I'm tipping the upper sprocket would be out further

some more pics,the shaft wont come through any more,there is previous damage on mounting plate,am starting to think maybe it is wrong clutch for this model

I'm assuming the last pic is the outside housing where the sprockets mount? What has been rubbing up against it, has the bearing done that? If this is the case there is an incorrect or missing distance piece, nothing should be touching that housing except the 2 bolts holding the bearing on. Assemble the parts on the shaft as it should go together without the housing and take another pic for us to look at. I don't think the problem is the clutch

here it is


you can see the sprocket is winding up hard against housing

The assembled picture is correct, what you have to achieve is the distance piece must be hard against the bearing and the sprocket hard against the other side of the bearing. Then you are able to tighten the sprocket to the shaft and it will rotate as designed. Then you have to work out what is binding up on the outer frame plate because something is binding up there. The assembled clutch shaft looks correct with the correct amount of thread showing through the sprocket

it's back together, cleaned primary clutch, replaced some bearing's that were missing, thought about what you said Norm about the distance piece, the only way was to turn the reel sprocket opposite to the pic,did the trick just need the nylon piece's that work the reel clutch will make some i guess. the binding damage was from the the guy i got it from,like me he tried a few way's but gave up,Norm,Jack,Paul,Greenpool,thank you...i will say these mower's are fast i am almost running to keep up.will post pic's soon cheer's

Glad to hear you got it sorted, was starting to think it might have beaten you

Just mowed the front,(fast)here's a couple of pic's cheer's

Looks a million dollars, good job. How often do you drive the Lincon?

Hello gml, Normand Contributors

Yep, it has come up a real treat!

A note for the record on the catcher decal you have chosen.
It says 'Manufactured by Atco (Aust.) Pty. ltd. That, of course,
is not the case with your machine. It was fully imported.

p.s. I love the Lincoln too. I bet it runs on the smell of an
oily refinery

-------------------------
Jack