In mechanics it's very seldom you know the exact problem when there could be multiple failures the cause the same issue, it's called troubleshooting.
The tractor came in with a no drive condition with an unknown failure, Perhaps they first split the tractor at the clutch joint expecting to find the issue there, when everything checked out. They would then have to split the tractor again at the transmission joint, to check the coupling.
I would normally agree except the mechanics comments.
And something else dont add up. Even if you split in the wrong spot, all is not lost. Because alot of the teardown up to the point of the split is the same.
For example, if book calls for 4 hours to split at the engine/trans, and also calls for 4 hours to split at the trans/rear end....its not additive. It wont take 8 hours to do both.
Once it was split at the wrong location in 4 hours (assuming engine/trans), it shouldnt take an additional 4 hours to pop the trans off the rear end.
But even so, regardless of all of this, the customer was told "book time is 4 hours", and part is $400.
Assuming a ~$120 labor rate...The initial quote was $4800. So $4800 - $400 part is $4400 in labor. 4400/120 is OVER 36 HOURS.
SO, WHERE are they coming up with that time at? IF it takes twice as long as book to tear apart, twice as long to put together, and a few hours to install the part, we are STILL at 1/2 the hours they were trying to bill for initially.
Something is amiss. Either the mechanics are compete idiots that only ever done oil changes, or he is being taken advantage of, or some combination of both.
I dont see why a component mechanic cant have the thing tore down and re-assembled in a day and a half tops. I would certainly think I could do that with my kubota which isnt that different.