Welcome to the Forums! Glad to have you.
The D model excavators were some of the best Cat made in my opinion. Largest one I owned was a 325DL that was a fantastic machine. Powerful and well balanced.
Not real familiar with the 336 or 330 enough to give an opinion. The 330DL's were very popular when they were new.
does you cat 325dl has any problem. I used to have 320d it has injection problem
I want to know their generational symptoms
That depends on whether you have a machine before 2011 or after 2011. The travel motor before 2011 is a small motor with a convex cover, and the one after 2011 is a large motor with a flat cover. The rotary pump of 336 has an extra breathing tube compared to the rotary pump of 330. These two are quite obvious.
In my country oil is dirty and my cat320d are overloadWhat kind of injection issues? Wondering if they could be related to dirty or contaminated fuel.
Before 2011That depends on whether you have a machine before 2011 or after 2011. The travel motor before 2011 is a small motor with a convex cover, and the one after 2011 is a large motor with a flat cover. The rotary pump of 336 has an extra breathing tube compared to the rotary pump of 330. These two are quite obvious.