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Message: <blockquote data-quote="Tazza" data-source="post: 8148" data-attributes="member: 82">From the top of the pump? odd setup....Most come from the sides, the rear 2 go to the right hand motor the front 2 goto the left. The vane pump attaches to the front with the high pressure hose going to the control block. The port block that sits on the pump connects to the "supercharge" port of the hydro pump. The filter hides in this block if your machine has this fitted.Are you able to take a picture of the pump and post it? this way i have a better idea if what pump setup you have. If you can't pist it here, you can send it to my e-mail address"taz38sup at yahoo.com.au" replace the at with an @ of course.The lack of drive on one side could be low charge pressure due to a restriction in the suction line filter. The spin on filter you are refering to i believe is a return line, this is under charge pressure not negative pressure like the suction line filter. One side is pulling the oil through instead of it being pushed at 70 odd PSI like the spin on type does.If that makes any sense.....</blockquote>