I believe this is what you are looking for.
Synthetic Tractor Hydraulic/Transmission Oil SAE 5W-30
Synthetic Tractor Hydraulic/Transmission Oil SAE 5W-30
They list it as equivalent to UDT no reference to the newer SUDT spec but no worries my manual specifies both and i'm fairly confident that this premium full synthetic exceeds this SUDT Spec. I wonder if kubota has a SUDT spec. They may just have a label it with an S as semi synthetic blend marker. the kubota site says both are interchangeable making me think they might not have a separate set of requirements
SPECIFICATIONS
AMSOIL Hydraulic/Transmission Oil is recommended for transmission and hydraulic applications that require any of the listed specifications. Consult your owner's manual for specific application requirements.
AGCO/Deutz-Allis/Allis-Chalmers – PowerFluid PF-821 XL, 25741, 246634
AGCO White Farm (Oliver) – Q-1826, Q-1802, Q-1766B (UTHF), Q-1766, Q-1722, Q-1705, Type 55
Allison – C4, C3, C2
API GL-4
Case New Holland (CNH) – MAT 3505 (MS-1209), MS-1207 (Hy-Tran® Plus), MAT 3506 (MS-1210) (TCH Fluid JIC-145), MAT 3509 (MS-1230, M2C48C), Poclain Equipment high pressure systems, MAT 3525 (FNHA-2-C-201.00, M2C134D), MAT 3526 (FNHA-2-C-200.00 winter grade), MAT 3510 (MS-1317, GL-4), B-6, MS-1206 (PTF), MS-1205 (TFD-II), MS-1204 (TFD), JIC-185, JIC-144, JIC-143, B-5, M2C86B/C, M2C53A, M2C41B, M2CA/B/C, ESN-M2C77A, ESN-M2C41B, ESNM2C43, ESN-M2C48B/C, ESN-M2C53A/B, ESN-142A, ESN-M2C143, ESN-M2C92A, ESN-M2C159A/B/C, Renk-Doromat 873 or 874A/B Bus Automatic Transmission Fluid, Valtractores
Caterpillar – TO-2
Clark – TA 12, TA 18, HR 500, HR 600
Dresser CED – Trans/Hyd Fluid
Deutz-Allis – 25743, 272843
Deutz-Fahr
Sperry Vickers/Eaton – I-286-S, M-2950-S
Fendt (Non-Vario)
Fiat-Hesston – AF-87
Ford – ESN M2C86B, M2C86C, Fiat requiring M2C134D, FNHA-2-C-201.00
John Deere – J20C, J20D (winter grade), J14A/B/C, JDT303, J20A/B, J121A
Komatsu
Kubota – UDT/M80B
Landini – Tractor Hydraulic Fluid
Massey-Ferguson – M-1141 (Permatran® 821 XL, Formerly Permatran ® III), M-1110, M-1127A/B, M-1129A, M-1135, M-1138, M-1139, M-1143, M-1145
Parker Denison – HF-0, HF-1, HF-2
Sauer Sundstrand/Danfoss – Hydrostatic Transmission Fluid
Steiger – HTF (SEMS 17001)
Volvo – VCE 1273.03, WB101
Versatile – Recommended for use in Valmet, New Idea Power Units, Leyland Belarus, Specs 23M & 24M
ZF – TE-ML 03E, TE-ML 05F, TE-ML 06K, TE-ML 17E