Zero Turn Mowers

Purchased a RZ4623 from Lowes on 5-19-12. First problem was two spacers (pn 539 109562) missing on top of idler pulley (pn 539 132728) which caused the belt keeper (pn 522 629701) to lock the idler from turning. The deck belt lasted about three minutes before smoking and breaking. Lowes was kind enough to replace my belt and found two washers which provided the idler with a way to turn properly. My latest trouble was when trying to grease the zerks (pn 539 115638) on the front wheel/axle assembly. After applying grease, the zerk remained with my grease gun. Thinking perhaps it was not installed properly, I tried the other side with the same result. I have the mechanical capability to drill out the hole, and install a new 1/8 npt zerk but do not wish to void my warranty.

Please advise. Thank you