Just going through my notes, thought someone may find this info useful for doing repairs/modifications. The technical manuals for most of these can be found at the manufacturer's websites.
Hydraulic drive pump:
Sauer Danfoss DDC20 - Specific Model 11090545
Pump Type - Axial piston pump of journal trunnion design with variable displacement
Displacement - 0-20cc/rev
Control - Direct displacement control
Mounting flange - ISO3019-1 flange 101-2 (SAE B), 2 bolt
Input shaft - ISO 3019-1, outer dia 22mm-4 (SAE B, 13 teeth)
Hydraulic drive motor:
Sauer Danfoss K series - KV45DNERCFF09SNNA FF18NNNNNN
Motor type - Inline, axial piston, positive displacement, two-speed variable motor
Displacement - Max 45cc/rev, Min 21.94cc/rev
Mounting flange - SAE B
Shaft - 15 tooth 16/32 pitch per ANSI B92.1-1970 class 5
Loop Flushing - Custom
Minimum angle/displacement - 9 degree
Shift Control - Single input hydraulic, no orifice
Hydraulic implement/charge pump: unknown/no markings
Hydraulic implement control valve and handlever:
Walvoil SDM102
DDC20 pump seal kit
Danfoss 11101229
Polaris 3120661
Hustler 603362
Pump case gasket
Danfoss 11082808
Polaris 3120677
Pump shaft seal
Polaris 3120674
Pump shaft to engine coupler- KTR Bowex
K series motor seal kit
Danfoss ??
Polaris 3120706