Qualcast Classic Petrol 43 Clutch/Roller adjustment

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FleetOfFoot
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Qualcast Classic Petrol 43 Clutch/Roller adjustment

Hello all,

I'm just hoping for a bit of technical advice from the experts please. 
The roller on my Qualcast Classic Petrol 43s goes round when lifted off the ground, but when bearing its own weight it won't propel the mower. 
Everything else, blades etc., works fine. 
I've played around with the clutch adjustment screws to no avail. 
I'll try to attach a couple of photos.  I'm wondering whether the small gap between the end of the roller and the plastic end disc/cap might have something to do with it?

If anyone has any bright ideas that will save me pushing it up and down my lawn, I'd be very grateful!

Thanks in advance. 

Messorestore
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Hi, I don't know much about

Hi, I don't know much about this model but the drive belt looks a little slack - even though the clutch is not engaged it still looks a bit loose, maybe stretched a little ? It looks like it's just tight enough to turn the roller when under no load but slack enough to slip when under load. Is there any belt adjustment ? If not a new belt may help. I don't want you to buy another belt if this one is ok , perhaps someone else had an idea. Sean

wristpin
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I think that the belt looks

I think that the belt looks slack because it is out of drive and that the problem may be more serious. The large pulley drives a reduction pinion that then drives a ring gear within the circumference of the roller. The mesh between those two can be a problem area, so further investigation may be necessary. The pulley and then the pinion can be removed reasonably easily from the exposed end in your images .The state of the pinion teeth will give an indication of what may be amiss. Be aware that across the Model and time of manufacture range  there have been pinions of different tooth count and material , so if a new one is required it is important to identify the correct one from the relevant parts list.

Edit

Just an after thought, although you say that everything else is ok, just check the coupling between the engine and the top shaft that drives both belts. Remove the cover and check the security and condition.

Messorestore
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Excuse my ignorance but is a

Excuse my ignorance but is a toothed belt correct for the drive on that mower ? Thanks 

wristpin
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Toothed belts are often used

Toothed belts are often used in small diameter smooth pulleys as they cope with the small radius and clutching function better than a full V.

FleetOfFoot
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Thanks for all your thoughts.

Thanks for all your thoughts.  I'll take a look and report back.  I suspect that it may well be to do with a slack belt.

wristpin
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suspect that it may well be

suspect that it may well be to do with a slack belt.

That could be, but I understood  you to say that you had tried that !

hortimech
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I would think it should be

I would think it should be fairly easy to find out where the problem lies. Start the engine with the machine on a flat surface  and engage the rear roller drive. If the pulley goes around but the machine does not move, then it is something inside the rear roller drive. If the belt slips around the rear roller drive pulley, then it is likely to be the belt.