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You need a service manual and a parts manual. Parts will show the numbers of these items so you get right part. I just went through loops with napa to get right hytran filter. They got the oil filter Doooop. So I took the parts cat down and NOW they got the right one coming. LOL. So that is priceless. The diagrams help too! Service manual will show where and what to check when. Like x many hours change or check this. Repair manual is alike a chiltons car/truck book and show tear down and rebuild of entire unit.
Sounds like your is more like opur 2500. It has a oval shaped filter. Now it sit inbetween two metal shields (sandwitched) and on one is a hole. In that hole it has a micro metal filter, with a piece looks like inside of radiator cap right? IF so were looking at same thing basically.
That sprong only move IF the filter clogs. It then allows fluid to pass by filter and run through a metal micro filter instead bypassing the main one. Without this piece (or if spring stuck) it would literally suck a clogged filter into the pump unit. I assumed that was what it was for, and the napa guys agreed. If not someone will correct me Im sure heh. But it does make sense.
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