Best place to purchase air & hydraulic filters is Orange tractor parts I just purchased a suction and return filters for about $39.00 each that includes S&H, Talk to Tracy Stocker 877 809 5565 . For engine/fuel Amazon works for me. Get a work shop manual for your ex will help a lot. Also change out lub in finials 80w-90 that's A MUST DO ! ( $4000+ each side replacement cost)
<tracy@bigorangeparts.com>
I have no connection with Big Orange Tractor parts they are in GA and are good poeple to deal with and have the best prices for Kubota excavator parts , My local dealer wants about 23% more and 2-3 weeks wait.
This site deals mostly with tractors,for Excavators go to
http://www.heavyequipmentforums.com/forumdisplay.php?49-Excavators .
Go to Kubota home page for parts break down , you should have part numbers before ordering saves time and you can check prices with dealer too with p/n.