With the help of this post I was able to replace the fan belt (part 70000-73818) on the Kubota B7100. Normally replacing a fan belt would be a simple procedure, however in this case, the hydraulic pump for the Front End Loader (FEL) is driven by the front PTO shaft which has the belt looped around it.
In the hope that someone else might find this useful, here are the steps I used:
- Remove the two protective plates from the front of the tractor that are covering the FEL pump.
- Loosen the adjusting nut on the tension pulley and turn the tension bolt to release the belt.
- Remove the belt from the tension pulley so that it's loose between the top pulley and PTO shaft.
- Loosen the radiator by removing the cotter pins and then loosening the bolts at the bottom of the tractor.
- Carefully work the belt past the radiator fan rotating the fan and working the belt around one blade at a time near the bottom of the radiator.
- Disconnect the front chain link that connects the PTO shaft to the FEL pump.
- Remove the 4 bolts holding the hydraulic pump mount so it is possible to separate the shafts.
- Work the fan belt through the between the top of the PTO shaft and bottom of the radiator until it becomes free.
Many of these steps involve working in the confined space of the engine, and therefore it took me about 2 hours to remove the old belt and the same amount of time to put the new one on.
