First, you have an LA434 loader, not an LA495 as there is no such thing. You are covered for 5 years from the purchase date. The warranty would cover all costs.
Ask your dealer about this TSB.
TSB-2022-018-E-R2 - B-Series; LA435 and LA535 Swift Tach Loader Hook Disengage During Operation...
Most of us realize that you have a serious problem with the truth and facts, but:
Except for the fact that only the center blade is driven by an oil-filled gearbox. A belt drives the outer blades and they have greaseable ball bearings.
Let me guess, you removed the glow plugs and cranked the engine using the starter.
After removing the glow plugs, the engine must be cranked over by hand slowly several times to clear the oil from the cylinders. When you try to clear them using the starter, the oil can not be expelled through...
Sometimes one needs to put on their big boy pants, and rather than try to blame everyone for one's own mistakes, admit to your mistakes and pay the bill.
The OP stated that the brush pulled a pin out, it is his problem and no one else's.