Tiger JD 5083E Mounting And Operating Instructions page 92

The ball valve at the hydraulic reservoir may need to be closed during certain
maintenance or repair procedures. THE BALL VALVES MUST BE OPEN (handle
parallel with valve) WHEN TRACTOR IS RE-STARTED OR PUMP IS COUPLED
TO MOTOR OR P.T.O. ! Failure to do so may result in component failure!
MAINTENANCE MAINTENANCE
BALL VALVES
Cheetah Maintenance Section 4-14