My last 5000 had an intake filter inside the case, had to take the rockshaft cover off to get to it. If you wind up changing it I'll warn you there is a hidden bolt under the right side of the cover where it bolts to the rear end. And it's strong enough to lift the rear wheel off the ground when you hook a come-a-long to the cover and a floor joist. Or so I've heard...
Filters, pump or a blockage in the lines/valves is the first things that pop into my head. May want to check your couplers if it's just slow on the remotes. Or is the 3pt slow, too? The 3pt fluid passes thru the block under your seat, giving the remotes priority.