Toyota 2SDK8 hydraulic hose and connector sizes?

No published hose/fitting size chart exists for the 2SDK8 in any manual I can verify — Toyota never released a full parts catalog for the 2SDK series in North America, and the closest thing circulating is a 330-page scanned repair manual community members trade on the forums, which covers fluids and rebuild procedures but not a fitting size table. The 2SDK8 shares its hydraulic pump, cylinders, and general architecture with the Toyota SDK6/7/8 family and, according to one forum contributor, the parts book circulating is actually for a 3SDK 7-8 but fits the 2SDK8 since it "looks the same."

Since there's no factory dash-size chart to point you to, here's the practical way to get exact sizes off the machine itself:

1. Measure hose OD and count wire braids (1-wire braid is typically SAE 100R1, 2-wire is 100R2 — most skid steer main circuits from this era run 100R2 for pressure lines, 100R1 or return-rated hose for case drain/return).
2. Check the fitting thread by hand-threading a set of JIC/ORB gauges (most Toyota industrial hydraulics from the 80s-90s use JIC 37-degree flare fittings, occasionally metric ORFS on later Dash 4 models) — don't guess and force a fitting, mismatched threads gall fast under pressure.
3. Any hydraulic hose shop (crimp shop, not just a parts counter) can size and crimp a replacement on the spot from the old hose and fitting if you bring both ends in — this is usually faster and cheaper than chasing an OEM part number that likely isn't stocked anywhere in the US.
4. For reference, the hydraulic filter cross to NAPA 1551, WIX 51551, DONALDSON P551551, and the drive/main pump has been sourced as an aftermarket replacement rather than rebuilt, since aluminum pumps on this machine aren't really meant to be rebuilt per one owner's experience after a failed reseal attempt.

If you can post which circuit you're chasing (main pump inlet/outlet, lift cylinder, drive motor, or aux), I can narrow down typical sizes seen on that specific line based on known SDK8 rebuilds.