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Read articles →This is a hands-on diagnostic and repair video for a 1985 Kubota L2550 with worn splines in the fan shaft joint, a part that normally costs $250. The owner traces a grinding noise to a slipping shear-disc coupling near the water pump, then improvises a fix using stacked flat washers and 8mm bolts costing under a dollar, reassembles it, and tests it under load bushogging. Best for owners troubleshooting overheating or unusual front-end noise on older Kubota models.
Posted by the OldGuyDIY channel, an owner working through his own tractor's problem with trial-and-error troubleshooting rather than professional training.
The fan shaft joint splines wore out after 40 years, letting the shaft spin freely so the fan was not driven, causing overheating and a grinding noise from the shaft banging inside the coupling.
Remove the bolts from the water pump and friction disc, slide off the shaft joint, then reassemble with a spacer made of six stacked quarter inch flat washers per side and new 8mm bolts to re-engage the splines.
Remove the two bolts into the water pump, rotate the unit so bolts are at 3 and 9 o'clock, flex the shaft toward you, remove the closest bolt, then slide the shaft joint off the spline shaft.
