While looking at my M4700 draft control (tractor is sitting still and not running) the Draft Control lever will NOT move. I notice the Ops Manual says not to use the hydraulic system until the tractor is warmed up or damage can occur. The temps down here are in the mid-70s.
Why would the Draft Control lever be frozen stiff?
The draft control system on Kubota L series tractors is a bit of a Rube Goldberg, being comprised of external linkages connected to the lift arm, position control lever, draft control lever, draft feedback rocker, and the lift valve.
Moreover, draft control is a dealer installed option on the L series and proper set-up requires loading the lift arms with 900 Lbs. (L6060) of suitcase weights (not 950 or 850 but 900) for proper adjustment. Because few dealers do this, most are not properly set up or even non functional.
With weight on the lift, the linkages may well be under stress especially if the engine is not running. Forcing the draft control lever in such condition can result in damage.
SDT