According to my Kubota Workshop manual for the D600, some suggestions for overheating:
Engine Oil Insufficient
Fan Belt Broken or tensioned improperly
Cooling Water Insufficient
Radiator net and radiator fin clogged with dust
Inside of radiator corroded
Cooling water flow route corroded
Radiator cap defective
Water pipe damaged
Thermostat Defective
Water pump defective
Mechanical seal defective
Overload running
Head gasket defective
Incorrect injection timing
Unsuitable fuel used.
I would look at and eliminate the easy stuff first
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1989 - Cub Cadet 1772
1987 - Cub Cadet 1572 w/Rear PTO & Cat. 0
38" Lawn Sweeper #196483
42" L42 (Bush Hog) Rotary Cutter # 190349
45" 2-Stage Snowblower # 196364
48" Haban Rotortiller Rear PTO Driven #190356
54" SnowBlade with hydraulic Angle #196376
60" Haban Mowing Deck #196374
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