Yard Man 8/26 slow and variable in forward speeds - Snowblower Forum : Snow Blower Forums
 
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post #1 of 9 Old 01-10-2017, 12:50 PM Thread Starter
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Yard Man 8/26 slow and variable in forward speeds

I have a Yard Man 8hp 26" blower from 1977, and it has been gradually losing forward speed over the past 3 years.

The symptom is inconsistent forward speed when I change in and out of a specific gear. So if I am in second and shift into reverse to reposition, going back into second usually has a different ground speed. This is most obvious in 5th, which is usually a brisk walk: this past weekend it was a normal pace. There is also "slip" of some sort, meaning going up a slope I lose forward speed. This blower used to be UNSTOPPABLE in first, so grippy it would drag me no matter how much resistance I put on it.

I changed the drive belt this past fall with a factory part. I changed the friction wheel about a year before that, cleaning the friction disk with brake cleaner (none touched the rubber wheel), and the disk was in great shape. This really leaves just couple things remaining: friction disk, play in the friction wheel positioner, friction plate to disk pressure, drive belt sheave on the engine crank shaft, idler belt tensioner.

Other things to check?
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post #2 of 9 Old 01-10-2017, 12:55 PM
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I had some corrosion on the device that lifts the disc to the friction wheel. PB blaster and time to soak fixed it for me. I did clean the disc with acetone also.
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post #3 of 9 Old 01-10-2017, 01:34 PM
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Garage
How about cable adjustment?
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post #4 of 9 Old 01-10-2017, 03:24 PM
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The chain gear may have sheared its pin and be intermittently turning on its shaft. Not a common problem, but it does happen. If you scribe the gear and the shaft, it' s easy to rule out slippage. MH

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post #5 of 9 Old 01-10-2017, 03:58 PM
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Sounds like you might need to clean up and lightly lube the shaft the friction disc slides on.

Here are some how to videos: https://www.google.com/#q=donyboy+++...tion+disc+lube

If it's not that I'd check the shifting rod(s) to see if something is loose in the linkage and not replicating the position consistently.

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post #6 of 9 Old 01-10-2017, 08:52 PM
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For sure I'd look for looseness in the friction wheel horizontal position. Open up the transmission and try moving it side to side with your hand while the speed selection lever is engaged into a speed position.
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post #7 of 9 Old 01-11-2017, 12:27 AM
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It's anyone's guess until you open up the cover and give it a good look, but I'd suspect the linkages that slide the friction disk into the selected position. By now I'd assume the eyelets and rods would have substantial play in them.

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post #8 of 9 Old 01-11-2017, 02:49 AM
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A loose handlebar assembly can cause this. Since the cables are attached to it, when you vary pressure on the handlebar, you also vary tension of the rubber drive disk to the drive plate. very common...
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post #9 of 9 Old 01-11-2017, 07:21 AM Thread Starter
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So I suspect play in the linkage that positions the friction disk, as well as the one that pushes the friction disk and friction wheel. There seemed to be plenty of contact when I looked in there, but maybe the play is more pronounced under load. Thanks for all the tips so far, I'll take this apart this summer and make a project out of it.
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