The 354 is very similar apparently but it has a BD144 engine and our 364"s have a BD154. The 444 is very common around my area and it has the exact same engine/trans/rear diff as our 364 but it"s power steering and front axle are totally different. The 364 came with a double pump originally made by Plessy Dynamics but mine has been replaced and it is made by Sauer Sundstrand. It is exactly the same pump as the Plessy Dynamics but, as far as I know, Plessy sold out to Sauer or something of the like. These pumps have steel gears but the housing is made of aluminum. This is just not a good design since any little bit of "trash" or impurities in the hydraulic system eats away at the internal aluminum housing of the pump. This causes the tolerances to get large which means the pump eventually loses it"s ability to put up adequate pressure to do it"s job (it loses efficiency). These tractors do not have adequate filtration is a huge problem that leads to this issue. The little rinky dink screen on the suction line that is in the lower right corner of the reservoir (below the seat) just doesn"t provide quality filtration. When I get a new pump I will be installing an inline spin on hyd filter on the suction side of at least 25 micron or better. Thanks for you comments. Let me know if you find a pump I could use.
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