How to adjust Ariens LM21S Drive Mechanism?

I'm sure this has been covered. I searched for an online manual but could only find French, not English.
This is a four old model that up until now has worked well. This year the drive just doesn't want to propel. I tried adjusting the drive cable to no avail. The friction wheel and disk seem to be in good condition.
Does anyone have any suggestion as to what I might be able to do to resolve this? Pushing this around the yard is a back-breaker (literally).
Thanks all.
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chuck-nfny had written this in response to http://www.thestuccocompany.com/maintenance/How-to-adjust-Ariens-LM21S-Drive-Mechanism-311560-.htm :
bobmct wrote:

I can't help you, but I am having the same problem. If you get the answer , please let me know. snipped-for-privacy@adelphia.net -------------------------------------
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On Jan 12, 11:01 am, cfowle_at_adelphia_dot snipped-for-privacy@foo.com (chuck-nfny) wrote:

I posted this yesterday, but it never showed-up?! Even though the friction wheel contacts the drive disk it may be reduced enough in diameter or lacking friction because of it being aged and hardened. Try to check the tension between them. Some drives just have a spring on the handle or cable...and that gives you the tension. HTH bob
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