From the WSM:
REMOVE AND RE-INSTALL All Modeis 91. CLUTCH SPLIT.
To detach (split)
tractor between engine and clutch housing,
first remove hood. Drain hydraulic
system reservoir on Models L210 or
L260, or transmission housing on
Models L175, L225 or L225DT; then
remove inlet and pressure lines leading
to hydraulic pump. Disconnect fuel lines,
throttle linkage, decompressor linkage,
wiring and tachometer linkage after
first making sure battery ground cable is
removed to prevent an electrical short.
The clutch is running dry but its the hydraulic lines that you must break that will drain the fluid from the transmission.
Dave