If it's new to you, start with a service.
Engine coolant and oil.
Air filters
Hydraulic filter, possibly the hydraulic oil too.
The one part that is always neglected is the chain case oil. Remove the plug at the front and see if it's milky. If it's not, it should be ok, but replacing that isn't a bad idea, youy can recycle your hydraulic fluid to the chain case as to reduce waste.
Engine service is 200 or 250 hours i think, hydraulic oil and chain case is every 1,000 hours from memory too.
Other than that, they are pretty solid machines.