I have a 7HP Ariens (ST 724) - probably about 12 years old - not much use - runs great (had a full tune-up 2 years ago after a gear box issue.)
While the engine and unit is running great, I have noticed that the unit itself seems to be moving more slowly than previous years. I can't say if I noticed this immediately after the tune-up two years ago, but this past winter it was definitely moving only about 2/3s the speed it did previously. I recall walking at a very good clip when the transmission was in the fastest gear - now it's much slower.
Reverse also seems to be slower, but it's hard to say for sure given reverse being slower anyway.
I realize that snowblowers aren't made to be operated like racecars, but there are times I would like to operate at the fastest speed when the snow is little and/or powdery, etc.
I pulled off the cover and took a look at the friction disc. There is some oil gunk at the bottom of the cover - I'm told this is a sign of a wearing disc - but it does not seem extreme. The disc itself seemes to have plenty of rubber with much integrity.
Before I go to replace the disc - are there other possibilities that could be causing a slow-moving unit? The disc seems to be properly aligned on the opposing wheel (i.e., right near the edge for fastest speed). The belt is only 2 years old and the unit ran "fast" (normal) when it was newly replaced. It would seem odd that the belt is the culprit after only 1 year of very light use (especially since the belt prior to that lasted for much much longer)
Is it possible that the drive pull cord needs to be tightened? There seems to be plenty of rubber, but I realize this is all relative.
I am normally a fan of the "try and see" approach, but changing the friction disc doesn't seem as straightforward as I thought. I do have a manual with instructions, so I'm still willing to try - just thought I'd tap into years of collective experience to see if there might be other likely causes.
Local mechanic says it's a few hours to change the disc on this particular model ("it's the smaller disc", he says... "re-installing the washers alone are a big headache...") - he means the washers at the end of the hex rod... Don't know if he's just being extreme or if I should just give it a go...
Many thanks for any insight - I'd love advice on how to troubleshoot this is a systematic manner to avoid extra work, time and money...
Brad in MA
