Does each hose go from a manifold to each jack? Or do they go from jack to jack? It is the middle drivers side jack.
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That is probably a straight shot from the manifold to the jack or from the middle jack to the rear jack. You can tell by location of the hose. If it is on the rear side then it goes to the rear jack or if the front side then it goes to the manifold. The lines to the door side jacks cross over just before the middle jack. Following is how I replaced it. You can use basically the same procedure. Mine was on the manifold side, but just substitute rear jack for manifold if appropriate.
On my rig as you face the generator compartment, all the hoses come through the back wall on the right hand side near the floor then curve up the back wall, then along the right side to the manifold. After I got the coroplast down and figured out where the hose was, I hooked up to my truck and raised all the jacks so there was no pressure in the lines. I first removed the line from the jack, then the manifold, then fished the manifold end through the wall and fished the line through the hangers. Be aware, even though there is no pressure, there will be hydraulic fluid in the line and it will leak out as soon as the jack end is lowered. I got most of it in a can, but still had a little mess.
After you replace the line, fill the reservoir to its normal level and raise the jacks up and down two or three times to fill the new line, then fill the reservoir as need.
