Update. Well, the hour meter now reads 3.5 hours and I have had only two breakdowns
:
And as much as I would like to make some people's days by admitting that I was pressing the mower too hard, I do not think that is the case.
Failure #1 is the spring that holds tension on the serpentine belt that drives the three blades. Just mowing along happily and the blades stopped. Poked around a bit and found that the hooked end was broken off the spring. A couple of minutes with the vise grips, and I had formed a new hook. Put the spring back into place and away I go. Bad spring? I dono. That spring is pretty darn tight. Maybe the spring has extra tension to make sure the big motor does not slip the belt.
Failure #2 is that one of the pins that holds the front of the deck in place. Here is a "new" photo:
Those pins kind of worried me from the beginning, since the brackets were aligned such that there was a tension force on the pins against the keepers. Plus, the tension force allowed the two plates to separate, which then allows the pin to cock at an angle. Well, at some point, a pin came out. I assume that the keeper sheared from the tension force. I dug around the shop, and did not have anything that would work to replace it. Then I looked at the bumper and noticed that it had a pin that was the same size (except that the keeper on the bumper--which has no tension--was a heavier style /forums/images/graemlins/wink.gif). That got me going. I still did not like idea of there being tension on the keeper. Those are made to keep the pin from vibrating out, but they are not intended to endure a tension force. I got some bolts with the intention of replacing the pin + keeper with a bolt & locknut, but the clearances were such that that approach was going to be a bunch of work. Then I noticed the "fixed" anchor point of the bumper. That is a 1/2" bolt stepped down to a 3/8" threaded portion. It turned out to be exactly what I needed. I replaced the pins with those bolts, tightening the nut down hard onto its shoulder to lock it. The joint can still rotate, but the two flat members are kept close together. I think this is a good solution:
The only issue might be if the nut gets loose. If that happens I'll have to use some thread locker next time.
As long as I was mucking with it, there were two annoying issues with the deck. One is that the right hand blade's bearing was mounted such that it was impossible to get at its grease fitting. The second was that the shields were attached with cheesy self-tapping screws. Not that the self-tapping is so bad, but the tips poke under the deck and that may be a factor in some of the clogging:
Since I had to remove one shield to rotate the bearing so the grease fitting would be accessible, I thought I would try to correct those while I was at it. So I put 1/4" carriage head bolts into the "self-tapped" 5/16" holes. The shoulders of the carriage-head bolt pulled nicely into the threads of the hole:
I used washers and nylon lock nuts up top. Perhaps one day I'll get ambitious and cut those off or find some shorter bolts:
So I need to get some replacement bumper mounting hardware and a spare spring, but at least it is still mowing.