Anybody know what's going on here?
Well ... not to put too fine a point on it, but I think BukItCase kinda nailed it earlier ...
Why would there be a 1/4" NPT ftg (& swivel) in the 3/8" supply line.
The more interesting question is why in the world would someone place a quick disconnect in the supply, return or PBYD lines for a valve that is permanently mounted on the tractor ...
You'd think they would have been plumbed permanently ...
RS, you say that the aux hydr block is only 1/4" pipe?
Based on my visual inspection of the hydraulic block on my B2910, yes - it appears that the threaded inlet and outlet (both female) of the hydraulic block are 1/4 NPT.
I have the actual installation instructions for it up in the shop in the folder for the tractor ... I'll verify it in a little bit, when I go up there.
Why does that bigger inlet elbow have a 1/4"pipe on it?
Hard to say ... whoever did the install had that particular fitting in stock and wanted to get rid of it, etc., etc.
Probably no real legitimate reason for it ...
Based on the stated flow in and out of the hydraulic block, it does bottleneck it slightly.
Forgot to look for the hydraulic block, see where this all comes from. Will report back.
Looking at the tractor from the rear, it's on the right side, behind and north of the rear axle.
Look for a plate that
is bolted to the rear case and has a pair of tubes welded to it, and a square/rectangular block of metal welded onto the tubes (which is where the threaded holes - which face rearward - are ...)