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Message: <blockquote data-quote="Tazza" data-source="post: 12668" data-attributes="member: 82">You should be able to replace the filter without filling it with oil. If you want to limit how much air gets in the system you can fill it if you please, but its not critical.The hydrostats and hydraulics are linked. Your hydraulic pump provides charge pressure to your hydrostatic pumps. If you have a bad hydraulic pump your drive system will be affected but if you have a hydrostatic pump problem your hydraulics will nor be affected.Your bucket falling down could be adjustment (doubtful though), worn piston seals in your lift rams or a problem with the seals in your load checks in your control block.10W30 sounds rite for oil, i would stay away from additives. I have heard horror stories of additives that KILLED the pumps after they claimed they were ideal for that machine.Groaning is totally normal, it gets worse if you let the revs go down too far. About 3/4 throttle is about rite but every job is different. If you don't need mush power like driving down hills of flats i go about 1/2 but if i need power i go full, mostly 3/4 is good.Centre, this can be adjusted, i just don't know how on your machine but you can fix that! it will just be a small amount of wear causing it.</blockquote>