Is it larger than normal??
.......I did notice when I had a bucket load of concrete that the front tires were in a bind (flat) inflated to 40psi.........
They offerd two weights for the 580K
COUNTERWEIGHT front, 900 lbs
COUNTERWEIGHT front, 400 lbs
As told to me when i bought one.
The 900# is for hoe work mostly.
The 400# is for multi-purpose.
No front weight if loader work mostly.
The more counterweight you are carrying the less payload in the loader.
And the harder the machine will be on front end components.
Makes sense as the front axle does have a max load rating.
Picture of 400# counterweight