Yes make sure you have both of these braces and that the lower one is the upgraded version.
That will stop all the flexing which is causing your problems.
I also had a broken fender from this but did not know these braces were the problem.
.
.
.
Yes I thought the whole letter thing as awkward and not useful. But here is a chart I got.
I also put a white paint make on the letter I use so I can quickly put things back to normal.
Sorry for the small size. Again poor forum software.
.
.
.
If throwing belts check your brace between the Hydro's.
Do you have this setup underneath?
Also check the bolts to make sure they are tight and not broken.
.
.
.
Be aware that breaking bolts where you found them is a symptom not the cause.
The problem is your cross brace.
Do you have the heavy duty brace like this?
Also note there is a second brace.
Without these upgraded braces you are placing excessive stress on the hydro's too.
My first clue was...
Do you know about pulling the round lever to disengage the Hydro's?
There is one for each side. They are so you can push the mower around.
If one is pulled out but not the other you will only have one operating hydro.
Let us know what you find?
.
.
.
I have the SD54 but I think your 60 might use the same guard?
Mine was #119597 about $80.
I think it makes the mower look better too.
Probably should have been stock but this is a bottom of the line Hustler mower.
.
.
.
Be aware that the missing bolts are an indication of a bigger problem.
Be SURE you install these 2 upgraded braces between the Hydro's. This is a known problem so inspect your mower now to see if it has the upgraded brace and I strongly recommend adding the additional upper brace too. Check...
Do you know about the 2nd brace?
I upgraded the lower brace after mine broke and cracked my plastic fender.
The 2nd one mounts up higher and provides additional bracing
165 hours so far.
.
.
.
Yes here is the factory deck mod I was talking about without the added reinforcing bracket. You can see the holes drilled where it bolts to. They added a angle iron bracket but some people just cut it out and forget the added bracket.. The deck is very stout.
The factory kit for my SD54" was...