Scags STHM-20KH (3 wheel zero turn) runs but stopped moving

k_h_d

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  • / Scags STHM-20KH (3 wheel zero turn) runs but stopped moving
While operating my Scags STHM-20KH mower today it stopped moving either foward or reverse. No linkages from the foot pedal to the engine are broken. I am looking for tips on where to start researching on what is broken and what needs to be repaired. I will likely be calling a scags repair shop but want to educate my self on what will need to be looked at and repaired before doing so in order to make a good decision as to have it repaired or buy a new one. This is a mower that is over 20 years old with 1250 hours on it. Has been operating well with maint. over the years.
 

mechanic mark

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  • / Scags STHM-20KH (3 wheel zero turn) runs but stopped moving
Request Rejected click anyway, locate your serial number then manual & check drive belt for replacement.
 

k_h_d

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  • / Scags STHM-20KH (3 wheel zero turn) runs but stopped moving
Request Rejected click anyway, locate your serial number then manual & check drive belt for replacement.


The drive belt was off the pulley pump. It was not broken but it does look a little worn. I was able to put it back on the pulleys and the mower does drive fine.

What would cause the belt to slip off? I was going over some bumpy terrain but not too fast.
 
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mechanic mark

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  • / Scags STHM-20KH (3 wheel zero turn) runs but stopped moving
From being worn, cracked, etc. & possibly a worn out pulley. If & when you do replace belt, I suggest you use manufacturer OEM belt. Belts do get hot during operation & should be inspected every time you service your mower.
 

bertsmobile1

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  • / Scags STHM-20KH (3 wheel zero turn) runs but stopped moving
On older mowers I some times need to fit smaller belts to compensate for wear in the pulley .
Note this is usually another OEM belt that is a fraction of an inch shorter.
OEM belts are generally funny sizes like 124 + 25/32 " long.
Going down a whole inch as would happen if you bought a belt from Wally mart can cause a lot of damage for the sake of an extra $ 20.
 
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